What is mean by region of postive slope on the heating curve of water
Answers
When we talk about a heating curve of water, we are referring to a graph that shows the temperature of water as it is heated.
The x-axis of the graph represents the amount of heat energy being added to the water, while the y-axis represents the temperature of the water.
The region of positive slope on the heating curve of water refers to the portion of the graph where the temperature of the water is increasing as more heat energy is added. This region starts at the melting point of ice (0°C) and extends all the way to the boiling point of water (100°C) at standard atmospheric pressure.
During this region, the heat energy being added to the water is being used to break the intermolecular bonds between the water molecules and increase their kinetic energy, resulting in an increase in temperature. As the temperature increases, the water transitions from a solid (ice) to a liquid, and finally to a gas (steam).
It is important to note that the slope of the heating curve during the region of positive slope is positive, which means that the temperature is increasing at a steady rate. This region is significant because it represents the phase changes of water, which have important implications for a variety of fields, including chemistry, physics, and engineering.
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Related Questions
400 ml of a 75 M solution of H2SO4 is needed to for a lab. The stock solution is 16.0 M. Calculate how much stock is needed to make the solution.
Answers
Answer:
The volume of stock solution needed to make the solution is 1875 ml
Explanation:
The parameters given are;
The volume of 75 M solution of H₂SO₄ = 400 ml
The concentration of stock solution = 16.0 M
Number moles per liter of stock solution = 16 moles
Number of moles in required 400 ml solution = 0.4×75 = 30 M
Volume of stock solution that contains 30 M = 30/16×1 = 1.875 l
The volume of stock solution that is required = 1875 ml
What must be happening, according to Newton's second law of motion, if a rigid body of unchanging mass is observed accelerating?
A force is being applied to the mass.
A force was once applied but is now not being applied.
The mass must be changing.
No force was or is being applied to the mass.
Answers
Answer:
A force is being applied to the mass.
Answer:
A force being applied to the mass is the correct answer
Explanation:
What is the relationship between the number of carbon atoms in hydrocarbon at its boiling point ?
Please answer correctly with explanation.
Will give the brainliest !!
Answers
So
\(\\ \tt\longmapsto C\propto BP\)
No of carbon atoms is directly proportional to the boiling point of the compound.If no of carbon atoms increases in a hydrocarbon the length of carbon chain also increases and all carbons get wrapped around themselves.Which causes increase in boiling point of compound.Look the table below for the boiling points of some alkanes
\(\boxed{\begin{array}{c|c}\boxed{\bf Alkane}&\boxed{\bf Boiling point}\\ \sf CH_4&\sf -164°C \\ \sf C_2H_6 &\sf -88.6°C \\ \sf C_3H_8&\sf 42.1°C \\ \sf C_4H_{10} &\sf -0.5°C \\ \sf C_5H_{12} &\sf 36.1°C \\ \sf C_6H_{14} &\sf 68.9°C \\ \sf C_7H_{16} &\sf 98.4°C \\ \sf C_8H_{18} &\sf 125.7°C \\ \sf C_9H_{20} &\sf 150.4°C \\ \sf C_{10}H_{22} &\sf 150.7°C \end{array}}\)
Thomas Paine, a key figure in the American revolution, once said it is only error and not truth that shrinks from inquiry. What do you think he meant by this?
Answers
Thomas Paine once said it is only error and not truth that shrinks from inquiry. He meant that the more you inquire about something, less error and mistakes come from it, and more truth will.
What do you think Thomas Paine meant by this?It means that you can not make a problem worse by inquiring about it but you can only lessen the error within it. Thomas Paine was likely referring to the idea that truth has nothing to fear from examination or investigation, whereas error does. In other words, if a belief or idea is true, it should be able to withstand scrutiny and examination. On the other hand, if a belief is based on error, it will crumble when subject to inquiry.
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write down the two chemical reaction which are carried out by the catalyst.
Answers
describe what changes occur during alpha decay. group of answer choices the mass number is unchanged and the atomic number decreases the mass number and atomic number increases the mass number and atomic number decreases. the mass number and atomic number are unchanged the mass number is unchanged and the atomic number increases
Answers
The correct answer is: "The mass number and atomic number decrease."Option (1)
Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, which consists of two protons and two neutrons, from its nucleus. During alpha decay, the mass number of the parent nucleus decreases by four and the atomic number decreases by two, as two protons are lost in the process.
The resulting daughter nucleus has a mass number that is four units lower and an atomic number that is two units lower than the parent nucleus. The energy released during alpha decay is typically in the form of gamma rays. Alpha decay is commonly observed in heavy elements, such as uranium and plutonium, as well as in some isotopes of lighter elements, such as radon.
Therefore, the correct answer is: "The mass number and atomic number decrease."
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Full Question: describe what changes occur during alpha decay. group of answer choices
The mass number is unchanged and the atomic number decreases the mass number and atomic number increases the mass number and atomic number decreases. the mass number and atomic number are unchanged the mass number is unchanged and the atomic number increasesExplain the energy transformation that occurs when food is digested. (4 points)
a
Chemical energy transforms into mechanical energy.
b
Electrical energy transforms into mechanical energy.
с
Mechanical energy transforms into chemical energy.
d
Thermal energy transforms into electrical energy.
Answers
Answer: A. Chemical energy transforms into mechanical energy.
Proof of validity is shown below.
The organisms living in an intertidal zone must have adaptations to deal with:
(a) crushing waves (b) dehydration (C) exposure to air (d) all of these.
Answers
Answer:
I think it's (a.crushing waves)
The organisms living in an intertidal zone must have adaptations to deal with crushing waves, dehydration with rising and falling tides, and exposure to air at low tides.
What is an intertidal zone?The intertidal zone can be described as the area above water level at low tide and underwater at high tide. This region can include many types of habitats with several species of life, such as sea urchins, seastars, and species of coral with regional differences in biodiversity.
The area can be a narrow strip such as in Pacific islands that have only a narrow tidal range or can include several meters of shoreline where shallow beach slopes interact with the high tidal excursion.
In the intertidal zone, organisms are adapted to an environment of harsh extremes, living in water pressure with high potential. The intertidal zone is home to many species from different phyla.
Water is regularly available with the tides that vary from brackish waters, fresh with rain, to highly saline and dry salt, with drying between tides.
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Give the orbital notation for a neutral atom of titanium
Answers
Answer:
Explanation:
A neutral titanium atom will have 22 electrons. Therefore, its electron configuration will be 1s2 2s2 2p6 3s2 3p6 4s2 3d2.
The pOH of a solution of 0.15 M HCl (aq) would be what?
Answers
Answer:
13.18
Explanation:
We'll begin by calculating the hydrogen ion concentration, [H⁺] in the solution. This can be obtained as follow:
HCl (aq) —> H⁺(aq) + Cl¯(aq)
From the balanced equation above,
1 mole of HCl dissociate to produce 1 mole of H⁺.
Therefore, 0.15 M HCl will also dissociate to produce 0.15 M H⁺.
Thus, the concentration of the hydrogen ion, [H⁺] in the solution is 0.15 M.
Next, we shall determine the pH of the solution. This can be obtained as follow:
Concentration of the hydrogen ion, [H⁺] = 0.15 M.
pH =?
pH = – Log[H⁺]
pH = – Log 0.15
pH = 0.82
Finally, we shall determine the pOH of the solution. This can be obtained as follow:
pH = 0.82
pOH =?
pH + pOH = 14
0.82 + pOH = 14
Collect like terms
pOH = 14 – 0.82
pOH = 13.18
Therefore, the pOH of the solution is 13.18
The pOH of the solution is 13.18 when a solution of 0.15 M HCl (aq) is present.
What is pH?The potential of hydrogen; a measure of the acidity or alkalinity of a solution equal to the common logarithm of the reciprocal of the concentration of hydrogen ions in moles per cubic decimetre of solution.
Concentration of the hydrogen ion, [H⁺] = 0.15 M.
pH =?
pH = – Log[H⁺]
pH = – Log 0.15
pH = 0.82
Finally, we shall determine the pOH of the solution. This can be obtained as follow:
pH = 0.82
pOH =?
pH + pOH = 14
0.82 + pOH = 14
pOH = 14 – 0.82
pOH = 13.18
Therefore, the pOH of the solution is 13.18
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Which of the following are compounds? (Select all that apply.)
CO2
Cl2
Ne
NaCl
Answers
Usually scientists do not specialize and study one aspect of the
natural world, but will focus on many aspects to understand
why and how things happen.
TRUE
FALSE
Answers
chapter 3 reactivity of metals mcq question and question and answer and important notes?
Answers
Answer:
resend again that question dear
identify two ways recycling can reduce energy use?
Answers
EXERCISE 3: WHAT DOES pCO2 CHANGE? - When pCO
2
increases, the concentration of total CO
2
dissolved in water - When pCO
2
increases, the concentration of only CO
2
dissolved in water - When pCO
2
increases, the pH - Which form of dissolved CO
2
is most common in water? Ocean acidification is the decrease in pH due to increasing atmospheric CO
2
concentration.
2
. Choose the correct word option in the statements below: - An organism that needs CO
2
is likely to fare better / worse under ocean acidification. - An organism that needs HCO
3
- is likely to fare better/worse under ocean acidification. - An organism that needs CO
3
2−
is likely to fare better/worse under ocean acidification.
Answers
pCO2 is an important factor that affects various aspects of water chemistry and the impacts of ocean acidification. When pCO2 increases, the concentration of total CO2 dissolved in water also increases. This leads to changes in pH, which decreases due to increasing atmospheric CO2 concentration.
When pCO2 rises, the concentration of only CO2 dissolved in water increases. The dissolved CO2 forms carbonic acid, which contributes to the acidification of the ocean. This increase in CO2 affects the equilibrium between CO2, HCO3-, and CO3^2-, shifting it towards higher levels of dissolved CO2 and H+ ions, resulting in a lower pH.
In terms of the impacts of ocean acidification on different organisms, the effects can vary depending on their specific needs. An organism that requires CO2 is likely to fare better under ocean acidification since the increase in dissolved CO2 can provide them with a favorable environment. However, organisms that rely on HCO3- or CO3^2- may fare worse under ocean acidification, as the lower pH interferes with the availability of these carbonate ions, which are essential for shell formation and calcification in some marine organisms.
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Drag each number to the correct location on the equation. Each number can be used more than once, but not all numbers will be used.Balance the equation with the correct coefficients.
Answers
A chemical equation is said to be balanced when there are an equal number of atoms on both the reactant and product sides.
\(KCl3 = KCL + O2\)
In this case-
Therefore, we multiply by 2 on the reactant side and by 2 and 3 on the product side of the equation to make it equal. Equal numbers and types of each atom are present on both sides of balanced chemical equations. A balanced equation must have coefficients that are the easiest whole number ratio. Chemical reactions always preserve mass.
These are the atom counts on the reactant side.
K = 1
Cl = 1
O = 3
These are the atom counts on the product side.
K = 1
Cl = 1
O = 2
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in a mixture of three gases, gas a exerts a pressure of 0.25 atm, gas b exerts a pressure of 0.80 atm, and gas c exerts a pressure of 1.35 atm. what is the mole fraction of gas b?
Answers
The mole fraction of gas B is 0.333 in the given mixture of gases.
To find the mole fraction of gas B, we need to calculate the total pressure of the mixture and the partial pressure of gas B.
The total pressure of the mixture is the sum of the pressures exerted by each gas: 0.25 atm + 0.80 atm + 1.35 atm = 2.40 atm.
The mole fraction of gas B can be calculated using the formula:
Mole fraction of gas B = Partial pressure of gas B / Total pressure of the mixture.
The partial pressure of gas B is 0.80 atm, and the total pressure of the mixture is 2.40 atm.
Mole fraction of gas B = 0.80 atm / 2.40 atm = 1/3 = 0.333.
Therefore, the mole fraction of gas B in the mixture is 0.333.
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A spectrophotometric method for the analysis of iron has a linear calibration curve for standards of 0. 00, 5. 00, 10. 00, 15. 00, and 20. 00 ppm. An iron ore sample with an expected iron content of 40–60% w/w is to be analyzed by this method. An approximately 0. 5 g sample is taken, dissolved in a minimum of concentrated HCl, and diluted to 1 L in a volumetric flask using distilled water. A 5. 00-mL aliquot is removed with a pipet. To what volume (10, 25, 50, 100, 250, 500, or 1000 mL) should it be diluted to minimize the uncertainty in the analysis? Explain
Answers
To calculate the concentration of the iron sample by using a spectrophotometric method, it is necessary to dilute the sample. The volume to which the sample should be diluted is a crucial question in achieving the most accurate result.
The process involves diluting the sample, and the concentration must be calculated to determine the precise result of the dilution. This question can be answered by calculating the uncertainty and identifying the value of the uncertainty. The value with the lowest uncertainty will be the best value to choose. The volume with the lowest uncertainty will be the ideal volume to dilute the 5 ml aliquot of the iron sample to achieve a result with the minimum level of uncertainty.
To determine the optimal volume for dilution, the uncertainty should be calculated.
This can be done by using the equation for propagation of uncertainty, which states that the uncertainty of the result is equal to the square root of the sum of the squares of the uncertainties of the individual components. When calculating the uncertainty of the diluted sample, the uncertainty of the initial sample and the uncertainty of the diluent must be considered. The uncertainty of the initial sample can be calculated using the calibration curve. As the expected iron content is 40-60%, the concentration of the sample is expected to be 8-12 ppm. The uncertainty of the calibration curve is given by the standard deviation of the calibration standards.
The diluent has a negligible uncertainty. The uncertainty of the diluted sample will be lower if a larger volume is used for dilution because the relative contribution of the uncertainty of the initial sample will decrease. However, the uncertainty of the measurement will increase if the sample is diluted too much because the concentration of the analyte will be too low to be detected accurately. A 100 mL volume is a good choice because it balances the need for sufficient dilution to reduce the uncertainty of the initial sample with the need for sufficient concentration to allow for accurate detection of the analyte.
The volume of the sample that should be diluted is 5 ml. The minimum level of uncertainty is obtained at a dilution of 100 ml. When the volume of the diluent is greater than 100 ml, the uncertainty of the measurement increases, and when the volume of the diluent is less than 100 ml, the uncertainty of the measurement also increases. Thus, a 100 ml volume of diluent is the ideal volume to minimize the uncertainty in the analysis of iron.
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a solution of 1.80 g of a nonelectrolyte in 500.0 ml of water at 27.0°c has an osmotic pressure of 39.5 mmhg. what is the molar mass of the compound?
Answers
Answer:
The osmotic pressure can be calculated using the Van't Hoff equation:Π = MRTwhere M is the molar concentration of the solute, R is the gas constant (0.0821 L atm K^-1 mol^-1), T is the temperature in Kelvin (273.15 K + 27.0°C = 300.15 K), and Π is the osmotic pressure in atmospheres.
Converting mmHg to atmospheres:
39.5 mmHg * 1 atm/760 mmHg = 0.052 atm
Rearranging the equation and solving for M:
M = Π / (RT) = 0.052 atm / (0.0821 L atm K^-1 mol^-1 * 300.15 K)
Next, we can use the molar mass to find the moles of solute:
moles = mass / molar mass = 1.80 g / molar mass
Finally, we can set the moles equal to the molar concentration and solve for molar mass:
M = moles / volume = moles / 0.500 L
moles = M * volume = 0.052 atm / (0.0821 L atm K^-1 mol^-1 * 300.15 K) * 0.500 Lmolar mass = mass / moles = 1.80 g / (moles)
Solving for molar mass gives a value of approximately 86 g/mol.
The molar mass of the non-electrolyte is 169.9 g/mol.
Osmotic pressure is a colligative property of a solution, which means it depends on the number of solute particles in the solution, not on their chemical nature. For a dilute solution of a non-electrolyte, the osmotic pressure is given by the following equation:
π = MRT
where π is the osmotic pressure, M is the molar concentration of the solute, R is the gas constant, and T is the temperature in Kelvin.
In this problem, we are given the mass of the non-electrolyte (1.80 g), the volume of the solution (500.0 mL), and the temperature (27.0 °C), and we are asked to find the molar mass of the compound.
First, we need to calculate the molar concentration of the solution:
M = n/V
where n is the number of moles of the solute and V is the volume of the solution. We can find n by dividing the mass of the solute by its molar mass:
n = m/M
where m is the mass of the solute (1.80 g). Substituting these values into the equation for molar concentration, we get:
M = (1.80 g / M) / (0.5000 L)
Solving for M, we get:
M = 0.07198 g/L
Next, we need to convert the temperature from Celsius to Kelvin:
T = 27.0 °C + 273.15 = 300.15 K
Finally, we can use the equation for osmotic pressure to solve for the molar mass (M) of the non-electrolyte:
π = MRT
M = π / RT = (39.5 mmHg) / (0.08206 L atm/mol K * 300.15 K)
M = 169.9 g/mol
Therefore, the molar mass of the non-electrolyte is 169.9 g/mol.
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what volume of 0.500 m hydrochloric acid solution needs to be added to excess sodium carbonate in order to cause the evolution of 14.5 l of carbon dioxide gas at stp?
Answers
To determine the volume of 0.500 M hydrochloric acid solution needed to cause the evolution of 14.5 L of carbon dioxide gas at STP (Standard Temperature and Pressure), we need to consider the balanced chemical equation and stoichiometry.
The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium carbonate (Na2CO3) is:
2 HCl + Na2CO3 -> 2 NaCl + H2O + CO2
From the equation, we can see that for every 2 moles of HCl, 1 mole of CO2 is produced.
To calculate the volume of hydrochloric acid solution needed, we need to determine the number of moles of CO2 produced. At STP, 1 mole of gas occupies 22.4 liters.
Given that 14.5 liters of CO2 gas is evolved, we can calculate the number of moles of CO2 as follows:
Moles of CO2 = Volume of CO2 / Molar volume at STP
Moles of CO2 = 14.5 L / 22.4 L/mol
Moles of CO2 ≈ 0.648 moles
Since the stoichiometry of the balanced equation tells us that 2 moles of HCl are required to produce 1 mole of CO2, we can determine the moles of HCl needed:
Moles of HCl = 2 * Moles of CO2
Moles of HCl = 2 * 0.648 moles
Moles of HCl ≈ 1.296 moles
Now, we can calculate the volume of 0.500 M hydrochloric acid solution needed, considering the molarity and moles of HCl:
Volume of HCl = Moles of HCl / Molarity
Volume of HCl = 1.296 moles / 0.500 mol/L
Volume of HCl ≈ 2.592 L
Therefore, approximately 2.592 liters of the 0.500 M hydrochloric acid solution need to be added to excess sodium carbonate to cause the evolution of 14.5 liters of carbon dioxide gas at STP.
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What is the total number of joules required to freeze a 10 g sample of water at 0°C?
show work if possible and will give brainliest
Answers
Explanation:
the answer will be 98.4 kJ
As per concept of enthalpy of fusion , 98,397 joules of energy are required to freeze 10 g of water at 0°C.
What is enthalpy of fusion?Enthalpy of fusion is defined as the enthalpy change which results from when a substance changes its state from solid to a liquid at a constant pressure.Heat of solidification is opposite of enthalpy of fusion.During fusion there is a phase transition which takes place, from liquid to solid.
The temperature at which the fusion takes place is called as the fusion temperature. This enthalpy is accompanied without any change in temperature.
Enthalpy of fusion of water=333.55 J/g . This value is for 1 g of water as per definition,hence for 10 g water enthalpy of fusion is 10×333.55=3335.5 J.
Hence, 3335.5 joules are required for freezing 10 g sample.
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Atoms of which pair of elements will form ionic bonds in a compound?
Answers
what is the formal charge of an oxygen atom that forms three bonds and has one lone pair?A. -2B. -1C. 0D. +1E. +2
Answers
The formal charge of an oxygen atom that forms three bonds and has one lone pair, see in above figure, is equals to positive one (+1). So, the correct choice for answer is option (D).
The formal charge of an atom in a molecule is equals to the charge that reside on the atom if all of the bonding electrons were equally divided. The formula of formal charge is written as
FC = V− N− B/2
where V --> the number of valence electrons of the neutral atom in isolation (in its ground state);
N --> the number of non-bonding valence electrons on this atom in the molecule, B--> the total number of electrons shared in bonds with other atoms in the molecule. Now, we have a oxygen atom that will form three bonds and has one lone pair. See the above figure, the oxygen atoms have been numbered as 1, 2, and 3. We have to calculate the formal charge on oxygen atom numbered 1. So, the formal charge on central O atom marked 1
= 6 − 2 − 6/2
= +1
Hence, required charge on oxygen atom is +1.
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Given the unbalanced equation below, how many moles
of Li would be needed to produce 6 moles of LiCl?
Li + Cl2 → Lici
Answers
Answer: 6 mol Li
Explanation:
The first step is to balance the equation.
2Li+Cl₂⇒2LiCl
We would need our conversions to find the amount of moles of Li needed to produces 6 mol LiCl.
\(6molLiCl*\frac{2molLi}{2molLiCl} =6molLi\)
Select the NET ionic equation for the reaction between HCl and NaOH.A) H+(aq) + OH−(aq) → H2O(l)B) H+(aq) + Cl−(aq) + Na+(aq) + OH−(aq) → H2O(l) + Cl−(aq) + Na+(aq)C) HCl(aq) + NaOH(aq) → H+(aq) + Cl−(aq) + Na+(aq) + OH−(aq)D) HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)
Answers
The net ionic equation for the reaction in between the HCl and the NaOH :
H⁺(aq) + OH⁻(aq) → H₂O(l). The correct option is A.
The chemical equation is expressed as :
HCl(aq) --> H⁺ (aq) + Cl⁻(aq)
NaOH (aq)---> Na⁺ (aq) + OH⁻ (aq)
The complete ionic equation is as :
H⁺ (aq) + Cl⁻(aq) + Na⁺ (aq) + OH⁻ (aq) ---> Na⁺ (aq) + Cl⁻(aq) + H₂O(l)
For the net ionic equation , we remove the spectator ions that is the ions common in the both the reactant and products.
The net ionic equation is :
H⁺(aq) + OH⁻(aq) → H₂O(l)
Therefore, the option A is correct.
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Mariah wants to determine how much energy is needed to change 500 g of liquid water at 100°C to steam at 100°C. What information will BEST help her make this
calculation?
Answers
What is the wavelength (in nm) of an electron with the following kinetic energies? (a) 20.0 ev (no response) nm (b) 200 ev (no response) nm (c) 2.00 kev (no response) nm (d) 20.0 kev (no response) nm (e) 0.200 mev (no response) nm (f) 2.00 mev (no response) nm which of these energies are most suited for study of the nacl crystal structure? (select all that apply.) 20.0 ev 200 ev 2.00 kev 20.0 kev 0.200 mev 2.00 mev none of these
Answers
The wavelength of an electron can be calculated using the formula: wavelength = h / (mass of electron * velocity). Since kinetic energy is equal to the mass of the electron multiplied by the velocity squared, we can also calculate wavelength by using the formula: wavelength = h / sqrt(2mass of electron kinetic energy).
To convert the kinetic energies given in electron volts (eV) to Joules (J), you can use the formula: 1 eV = 1.6 x 10^-19 J
(a) 20.0 eV = 3.2 x 10^-18 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-18 J) = 2.4 x 10^-12 m or 2.4 pm (picometers)
(b) 200 eV = 3.2 x 10^-17 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-17 J) = 2.4 x 10^-11 m or 24 pm
(c) 2.00 keV = 3.2 x 10^-14 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-14 J) = 2.4 x 10^-8 m or 2.4 nm
(d) 20.0 keV = 3.2 x 10^-13 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-13 J) = 2.4 x 10^-7 m or 24 nm
(e) 0.200 MeV = 3.2 x 10^-11 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-11 J) = 2.4 x 10^-5 m or 0.24 nm
(f) 2.00 MeV = 3.2 x 10^-10 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-10 J) = 2.4 x 10^-4 m or 2.4 nm
A lower energy electron will have a longer wavelength, while a higher energy electron will have a shorter wavelength. To study the crystal structure of NaCl, you would need to use a technique such as X-ray diffraction, which typically uses X-rays with energies in the range of a few keV to a few tens of keV. Based on this, 2.00 keV and 20.0 keV energies are most suited for study of the NaCl crystal structure.
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A/an _______ is the smallest unit of matter that has the characteristics of a chemical element. Question 9 options: A) proton B) atom C) molecule D) electron
Answers
Answer: atom
Explanation: molecule is a group or two or more atoms
protons and electron are subatomic particles
atom is the smallest unit of matter
Based on what you observed in the lab, how do greenhouse gases affect the heat flow into and out of Earth’s atmosphere? Select the option that matches the data observed in the Greenhouse Effect gizmo.
Question 5 options:
As the percentage of greenhouse gases increase, the heat flow out of Earth’s atmosphere decreases.
As the percentage of greenhouse gases decrease, the heat flow out of Earth’s atmosphere decreases.
Answers
According to the observations in the Greenhouse Effect gizmo, as the percentage of greenhouse gases increases, the heat flow out of Earth's atmosphere decreases.
This means that option 1, "As the percentage of greenhouse gases increase, the heat flow out of Earth's atmosphere decreases," is the correct option.
Greenhouse gases, such as carbon dioxide and methane, have the property of absorbing and trapping heat radiated by the Earth's surface. This process is known as the greenhouse effect. When the concentration of greenhouse gases increases in the atmosphere, more heat is trapped and less heat is able to escape into space. As a result, the heat flow out of Earth's atmosphere decreases. This phenomenon contributes to the warming of the Earth's surface and leads to global climate change. The increase in greenhouse gas emissions from human activities has been identified as a major factor in the current trend of global warming.
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in calorimetry, energy is measured through heat transfer from one substance to another. Which of the following is NOT a method of heat transfer?
Answers
Answer:
Explanationconvection
:
In calorimetry, energy is measured through heat transfer from one substance to another. Convection is not the method of heat transfer.
What is a calorimeter?A calorimeter is a device used to measure the amount of heat involved in a chemical or physical process.
For example, when an exothermic reaction occurs in solution in a calorimeter, the heat produced by the reaction is absorbed by the solution, which increases its temperature.
One technique we can use to measure the amount of heat involved in a chemical or physical process is known as calorimetry.
Calorimetry is used to measure amounts of heat transferred to or from a substance.
To do so, the heat is exchanged with a calibrated object (calorimeter).
Heat loss due to conduction is prevented by placing the calorimeter box in a well-lagged vessel using wool or cork material.
Heat loss due to convection is prevented by placing a lid on the box.
Heat loss due to radiation is minimized by polishing the box in order to smoothen it.
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