Answer:
p = 1.714 g/cm3
Explanation:
Density Equation
p=mV
Where:
p = density
m = mass = 60g
V = volume = 35cm3
p = 60g x 35cm3
p = 1.714 g/cm3
p=1.714g/cm³
Explanation:
v=35cm³
m=60g
P=mass/volume (density formula)
=60/35
=1.714g/cm³
How many milliliters of gasoline have a mass of 2.4 kg ( D=0.74g/mL )?
Answer:
3243.2ml
Explanation:
Converting 2.4kg to g = 2.4X1000
=2400g
Since Density is mass/volume,
then volume is = mass/density
volume = 2400/0.74
=3243.2ml
What happens to the amount of solution when we add food colour to it?
Answer:
We need more? What else is in the question? This is unanswerable.
Explanation:
g Consider the following system at equilibrium where H° = -87.9 kJ, and Kc = 83.3 , at 500 K: PCl3 (g) + Cl2 (g) PCl5 (g) If the TEMPERATURE on the equilibrium system is suddenly decreased : The value of Kc A. Increases B. Decreases C. Remains the same The value of Qc A. Is greater than Kc B. Is equal to Kc C. Is less than Kc The reaction must: A. Run in the forward direction to restablish equilibrium. B. Run in the reverse direction to restablish equilibrium. C. Remain the same. Already at equilibrium. The concentration of Cl2 will: A. Increase. B. Decrease. C. Remain the same. Submit AnswerRetry Entire Group
Answer:
C. Remains the same
A. Is greater than Kc
B. Run in the reverse direction to restablish equilibrium.
C. Remain the same
Explanation:
As the reaction is exothermic (ΔH < 0), when occurs, produce heat.
Based on Le Chatelier's principle, if the temperature decreases, the system will produce more product trying to restore the equilibrium
* The value of Kc doesn't change because is the constant of the reaction, Kc. That is,
C. Remains the same* Qc is the ratio between products and reactants. As more product is produced, Qc will increase becomes:
A. Is greater than Kc*After the formation of product, the system must:
B. Run in the reverse direction to restablish equilibrium.Because product is produced
*Cl₂ as reactant is consumed producing more product, decreasing its concentration. But when the equilibrium is restored, its concentration would be the same
C. Remain the sameDifferent energy sources can be used to generate electricity. Which of the following uses a nonrenewable energy source to generate electricity?
a hydroelectric power plant
a generator that burns wood
a power plant that runs on oil
a windmill connected to a generator
Answer:
a power plant that runs on oil
Explanation:
A generator a power plant that runs on oil uses non-renewable sources of energy to generate electricity.
Non - renewable energy is an energy source that cannot be replenished within a short period of time. It takes geologic time scales to form such energy sources.
Oil is a fossil fuel and a non-renewable source of energy.
As it is used, the reserve is being depleted.
Answer:
a power plant that runs on oil
To find the order of a reaction with respect to one reactant, you will monitor the as the of . is changed.
The order of reaction is defined as the power to which the concentration of the reactants are raised in the rate equation of the reaction.
The order of reaction can be used to determine how a particular reactant affects the reaction. In order to find the order of a reaction with respect to a particular reactant, the concentration of the reactant is changed while keeping the concentration of other reactants constant. The rate of reaction is then measured and compared with the rate of reaction when the concentration of the reactant is not changed.The order of reaction with respect to a reactant can be determined using the following method:First, select a reactant whose order needs to be determined and change its concentration while keeping the concentration of other reactants constant. For example, if we want to find the order of reaction with respect to reactant A, we will change the concentration of A and keep the concentration of reactant B constant.Second, measure the rate of reaction at different concentrations of the reactant A. The rate of reaction can be measured by any suitable method such as change in color, pH, or by measuring the amount of product formed with time. A graph is plotted with rate of reaction on the y-axis and concentration of reactant A on the x-axis. The graph should be a straight line.Third, if the graph is a straight line passing through the origin, the order of reaction with respect to reactant A is one. If the graph is a straight line but does not pass through the origin, the order of reaction with respect to reactant A is two. If the graph is not a straight line, the order of reaction with respect to reactant A is either zero or fractional.For such more question on concentration
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label-free, visual detection of small molecules using highly target-responsive multimodule split aptamer constructs
The given statement is :label free, visual detection of small molecules using highly target responsive multimodule split aptamer constructs" is true.
The Colorimetric aptamer based sensors offer the simple means of the on site or the point of care of the target detection. However, the sensors are the largely incapable of the achieving the na-ked eye detection, this is because of the poor performance that of the target recognition and the signal reporting of the elements employed.
To address the problem, we report the generalizable strategy for the engineering novel of the multimodule split of the DNA constructs that termed as the CBSA zymes that is utilize the cooperative binding split aptamer that is CBSA as the highly target responsive bioreceptor and the new, the highly active split of the DNA zyme as the efficient signal reporter.
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This question is incomplete , the complete question is :
label free, visual detection of small molecules using highly target-responsive multimodule split aptamer constructs. This is true or false.
Which of these describes two isotopes of hydrogen? Select all that apply.
They have similar chemical properties.
They have different numbers of neutrons.
They are different elements.
They have the same mass number.
Isotopes are defined as same atomic number and different mass number. Two isotopes of hydrogen they have different numbers of neutrons.
What is isotope ?Isotopes are two or more different kinds of atoms that have the same atomic number and place in the periodic table but have different numbers of neutrons in their nucleus, resulting in differing nucleon numbers.
Isotopes are atoms that are part of the same element and have the same atomic number Z but a different mass number A. For instance, three isotopes of the element carbon, having respective masses of 12, 13, and 14, are carbon-12, carbon-13, and carbon-14.
Thus, Two isotopes of hydrogen they have different numbers of neutrons.
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Answer:
They have different numbers of neutrons.
Explanation
In which phase of cellular respiration is oxygen a substrate ?
Answer:
electron transport 11 is the correct answer
Which describes the burning of fossil fuels?
O A. Carbon dioxide is released into the atmosphere.
O B. Combustion causes greenhouse gases to break apart.
O C. It is an endothermic reaction.
O D. Crude oil forms during combustion,
Hi there! Let's tackle this together.
The answer to the question is option A.
When fossil fuels mined from the ground are burned with fire and sometimes crude oil, it releases toxic fumes which cause global warming. The same toxic fumes that come from these fossil fuels come from plastic.
The answer is option A.
The burning of fossil fuels yields carbon dioxide, water, and energy. The process of burning fossil fuels is known as “combustion”. So, option A describes the burning of fossil fuels.
What are fossil fuels?Fossil fuels are made from decomposing plants and animals. These fuels are found in the earth's crust and contain carbon and hydrogen, which can be burned for energy. Coal, Oil, and natural gas are examples of fossil fuels.
What is meant by combustion?Combustion is the chemical reaction that releases energy trapped in fossil fuels. Combustion is an exothermic reaction, which means that energy is released. Usually, heat and light are released during a combustion reaction. During exothermic reactions (like combustion), bonds are broken, which allows the energy trapped in the bonds to be released and do work.Combustion(burning) of fossil fuels:During the combustion of fossil fuels, the carbon compound in the fossil fuel reacts with oxygen in the presence of a heat source to form carbon dioxide (CO2) and water.Energy is also needed for the fossil fuel to react with oxygen, so the energy use portion of combustion is an endothermic reaction.Therefore, the burning of fossil fuels releases heat energy, and the primary byproduct of combustion is carbon dioxide (CO2).
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A 11.79 g sample of Mo2O3(s) is converted completely to another molybdenum oxide by adding oxygen. The new oxide has a mass of 14.151 g . Add subscripts to correctly identify the empirical formula of the new oxide.
Answer:
MoO₃
Explanation:
To solve this question we must find the moles of molybdenum in Mo2O3. The moles of Mo remain constant in the new oxide. With the differences in masses we can find the mass of oxygen and its moles obtaining the empirical formula as follows:
Moles Mo2O3 -Molar mass: 239,878g/mol-
11.79g * (1mol / 239.878g) = 0.04915 moles Mo2O3 * (2mol Mo / 1mol Mo2O3) = 0.09830 moles Mo
Mass Mo in the oxides:
0.09830 moles Mo * (95.95g/mol) = 9.432g Mo
Mass oxygen in the new oxide:
14.151g - 9.432g = 4.719g oxygen
Moles Oxygen:
4.719g oxygen * (1mol/16g) = 0.2949 moles O
The ratio of moles of O/Mo:
0.2949molO / 0.09830mol Mo = 3
That means there are 3 moles of oxygen per mole of Molybdenum and the empirical formula is:
MoO₃What is the molar mass of AlCl3?
A. 62.43 g/mol
B. 116.39 g/mol
C. 124.86 g/mol
D. 133.33 g/mol
E. 187.29 g/mol
Answer:
133.33 g/mol
Explanation:
Molar mass:
Molar is the sum of all the atomic masses of the atoms of the elements present in a compound.
Molar mass of AlCl₃:
Atomic mass of Al = 26.98 amu
Atomic mass of chlorine = 35.45 amu
There are 3 atoms of chlorine present.
35.45×3 = 106.35
Molar mass of AlCl₃ = 26.98 + 106.35 = 133.33 g/mol
The molar mass of AlCl₃ is 133.33 g/mol.
What is molar mass?Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
Atomic mass of Al = 26.98 amu
Atomic mass of chlorine = 35.45 amu
There are 3 atoms of chlorine present.
35.45 × 3 = 106.35
Molar mass of AlCl₃ = 26.98 + 106.35 = 133.33 g/mol
Thus, the molar mass of AlCl₃ is 133.33 g/mol.
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A 1.85-mole sample of H₂O2 weighs
(A) 33.3 amu
(B) 35.9 g
C) 62.9 g
(D) 1.85 g
E 33.3 g
Considering the definition of molar mass, the correct answer is option c): the mass of 1.85 moles H₂O₂ is 62.9 grams.
Definition of molar massThe molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.
The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
Molar mass of H₂O₂In this case, you know the molar mass of the elements is:
O= 16 g/moleH= 1 g/moleSo, the molar mass of the compound H₂O₂ is calculated as:
H₂O₂= 2× 1 g/mole + 2× 16 g/mole
Solving:
H₂O₂= 34 g/mole
Mass of 1.85 moles H₂O₂You can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 34 grams, 1.85 moles of the compound contains how much mass?
mass= (1.85 moles× 34 grams)÷ 1 mole
mass= 62.9 grams
Finally, the mass of 1.85 moles H₂O₂ is 62.9 grams.
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how does the earth compare in the orbital speed to the other planets?
A teapot contains 500 mililiters of water. Five thousand calories of heat are added to the teapot. What is the increase in the temperature of the water?
The temperature of the water in the teapot increases by 10 degrees Celsius when 5000 calories of heat are added to it.
To calculate the increase in temperature of the water, we need to use the specific heat capacity of water, which is approximately 1 calorie/(gram * degree Celsius). We also need to know the mass of the water in grams since the calorie unit is based on grams.
The volume of water in the teapot is given as 500 milliliters. We can convert this to grams using the density of water, which is 1 gram/mL. Therefore, the mass of water in the teapot is:
500 mL * 1 g/mL = 500 grams
The amount of heat added to the water is 5000 calories. We can use the equation:
Q = m * c * ΔT
where Q is the amount of heat, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.
Rearranging this equation to solve for ΔT, we get:
ΔT = Q / (m * c)
Substituting the given values, we get:
ΔT = 5000 calories / (500 grams * 1 calorie/(gram * degree Celsius)) = 10 degrees Celsius
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which functional group does the molecule below contain
Answer:
All functional groups in organic chemistry
Functional groups include: hydroxyl, methyl, carbonyl, carboxyl, amino, phosphate, and sulfhydryl.
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which has the lowest number of valence electrons? and how many does each have?
Mg2+
Ga+
Ar+
C+
S2-
F-
Fluorine (F-) is the element with the fewest valence electrons. Seven electrons make up the outermost shell of fluorine, and one of them is unpaired. As a result, fluorine possesses seven valence electrons altogether.
Eight valence electrons are present in magnesium (Mg2+), nine are present in gallium (Ga+), eight are present in argon (Ar+), four are present in carbon (C+), six are present in sulphur (S2-), and seven are present in fluorine (F-).
Fluorine has a lower number of valence electrons than the other elements because it has a greater effective nuclear charge. This indicates that the fluorine atom will take electrons away from its outermost shell since it is more attracted to electrons than the other elements.
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Explain which compound(s) could produce fluoride ions in the water. In response, be sure to include:
• Which of the listed compounds are ionic and which are covalent.
• How ionic and covalent compounds are different.
• Why only ionic compounds would produce fluoride in water.
Answer: NaF is ionic. NF3 is covalent. SiF4 is ionic. CaF2 is Ionic and NH4F is also ionic. Ionic compounds transfer electrons whereas covalent compounds share electrons hence the word "co". Also, ionic compounds are formed with metal and nonmetal. Where a covalent is with 2 nonmetals. Only ionic compounds would produce fluoride in water because ionic compounds can dissolve in water and covalent compounds cant.
A large room contains moist air at 308C, 102 kPa. The partial pressure of water vapor is 1.5 kPa. Determine
Answer:
you tell me
Explanation:
Use Lewis dot structures to show the ionic bonding in the following pairs of elements. Show the transfer of electrons using arrows. Write the correct chemical formula for the ionic compound that forms.
1) barium oxide (Ba and O)
2) sodium oxide (Na and O)
3) calcium chloride (Ca and Cl)
4) sodium nitride (Na and N)
5) aluminum oxide (Al and O)
6) magnesium phosphide (Mg and P)
Answer:
See explanation
Explanation:
A Lewis structure is a representation of atoms of elements using dots. These dots show the number of outermost electrons in the atom. These outermost electrons are involved during ionic bonding.
We can see from the image attached that in ionic bonding, electrons are transferred from the metal to the non metal to form the ionic compound. Arrows have been used to show the transfer of electrons from metals to non metals.
Which ONE of these cations has the same number of unpaired electrons as Fe2+ ? A) Ni2+ B) Fe3+ C) Cr2+ D) Mn2+ E) Co2+
Answer:
Explanation:
Fe2+ Has 4 unpaired electrons.
By method of elimination;
Option A: Ni2+ has two unpaired electrons. so this option is wrong.
Option B: There are 5 unpaired electrons in the Fe3+ ion. so this option is wrong.
Option C: There are 4 unpaired electrons in the Cr2+ ion. so this option is correct.
Option D: There are 5 unpaired electrons in the Mn2+ ion. so this option is wrong.
Option E: There are 3 unpaired electrons in the Co2+ ion. so this option is wrong.
Explain in terms of chemical reactivity why the elements in group 18 on the modern periodic table were not identified by Mendeleev's at that time
Answer:
elements tend not to react with other elements, there were no oxide compounds for Mendeleev to study. –Group 18 elements are generally unreactive. sodium ion is smaller because the sodium atom lost one electron. –An Na+ ion is smaller because it has one fewer electron shell.
Explanation:
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Pewter is a solidified solution of tin and lead or tin and zinc. In both cases, tin is the main component. Which metal would you classify as the solute in each type of pewter?
In order for radiation to transfer heat,
electromagnetic waves must be transmitted
objects must be in direct physical contact
particles must circulate and move in a liquid or gas
thermal energy must move from cold to hot objects
To transfer heat in radiation electromagnetic waves must be transmitted.
Heat transfer occurs through conduction, convection and radiation.
Conduction requires direct physical contact whereas in convection the particles must circulate and move in a liquid or gas. Both of the transfer heat only in the presence of air.
Radiation is a type of heat transfer that occurs everywhere through electromagnetic waves. In radiation, electromagnetic waves must be transmitted for the transfer of heat. It happens even in vacuum.
Every object radiates thermal energy. Even humans radiate heat at all times. It does not have to move from cold to hot objects.
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How much water would you need to add to 550 mL of a 2.5 M KCl solution to make a 1.0 M solution?
Answer with Explanation:
To determine the amount of water needed to dilute a 2.5 M KCl solution to a 1.0 M solution, we can use the dilution formula:
M1V1 = M2V2
where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.
In this case, we know that:
M1 = 2.5 M
V1 = 550 mL
M2 = 1.0 M
We want to find V2, the final volume of the solution, which will be greater than 550 mL due to the addition of water.
Using the dilution formula, we can solve for V2:
M1V1 = M2V2
2.5 M x 550 mL = 1.0 M x V2
V2 = (2.5 M x 550 mL) / 1.0 M
V2 = 1375 mL
Therefore, we would need to add 1375 mL - 550 mL = 825 mL of water to 550 mL of a 2.5 M KCl solution to make a 1.0 M solution.
When 35 mL of 0.92 M H2SO4 reacts with excess Al, how many L of H2 are formed at 23 °C and a
pressure of 0.980 atm?
2Al(s) + 3 H2SO4(aq) → Al2(SO4)3 aq) + 3 H2(g)
A chemical process known as an oxidation-reduction (redox) reaction occurs when electrons are exchanged between two or more species.
Thus, This happens between two distinct elements in the majority of redox reactions. The element that loses electrons is said to be the reducing agent and is oxidized.
The oxidizing agent is the element that obtains electrons and is reduced. These oxidation/reduction reactions in acidic or basic solution can be expressed as balanced half-reactions. The total balanced redox reaction equation is created by adding these balanced half-reactions.
This is an equation for a redox reaction. We must recognize changes in oxidation states that take place between elements in order to balance the equation.
Thus, A chemical process known as an oxidation-reduction (redox) reaction occurs when electrons are exchanged between two or more species.
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What is the molar concentration of Zn2+ ions in a solution, if the electrode potential value is 59mV less than the standard electrode potential value at 298 K?
Molar concentration of Zn2+ions in a solution is 3.481 mol/lit
The electrode potential value is 59mV
Temperature=298k
What is electrode potential?
It is a force of galvanic cell. basically it is the difference between an electrolyte and electrode.equation formed- Zn → Zn2+ + 2e
from Nernst equation-
E=E cell - 0.059 log [Zn2+]
[zn2+]=3.481 mol/lit
hence, Molar concentration of Zn2+ions in a solution is 3.481 mol/lit
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Equivalent: 30 mL =_OZ
30mL = 1.01442oz
Explanations:
According to the question, we are to convert 30mL to fluid ounces.
According to the conversion factors;
1mL = 0.033814oz
Determine the measure of 30mL
30mL = 30 * 0.033814
30mL = 1.01442oz
This shows that there are 1.01442oz in 30mL
A gas company in Massachusetts charges $1.30 for 17.0ft³ of natural gas. Convert this rate to dollars
per liter of gas.
Answer:
See below
Explanation:
Conversion factor : 1 ft^3 = 28 .317 liters
$ 1.30 /( 17 ft^3 * 28.317 liters/ft^3) = $.0027 per liter
Which of the following is NOT a
physical property?
A melting point
B state of matter
C density
D flammability
when the equation below is balanced the coefficient of carbon dioxide is c4h8+o2 co2+h2o
Answer:
The coefficient of carbon dioxide is eight (8).
Explanation:
To balance the equation, we would have to ensure the number of chemical elements in the reactant side is equal to the number of chemical elements in the product side.
Given the chemical equation below;
\(C_{4}H_{8} + O_{2} ----> CO_{2} + H_{2}O \)
Now, we will balance the above equation with the smallest coefficients possible;
\(2C_{4}H_{8} + 12O_{2} ----> 8CO_{2} + 8H_{2}O \)
Let the Coefficient of Reactants be denoted by Cr and Coefficient of Product be Cp.
The Reactants are: C_{4}H_{8} and O_{2}
The products are: CO_{2} and H_{2}O
Therefore, we can deduce the following from the balanced chemical equation;
Cr(C_{4}H_{8}) = 2
Cr(O_{2}) = 12
Cp(CO_{2}) = 8
Cp(H_{2}O) = 8
Hence, the coefficients are 2, 12, 8 and 8 respectively.