a student heats up solid X. it starts to melt at 35°c, and finishes melting at 40°C. what does this tell you about solid X.
a. solid X is a pure compound
b. solid X is a pure element
c. solid X is an impure substance
d. solid X is an impure compound
Answers
The answer to the question what does this tell you about solid X is C. solid X is an impure substance
Since solid X starts to melt at 35°c, and finishes melting at 40°C, it shows that it melts at a range of temperatures.
This shows that solid X is an impure substance since it melts at a range of temperatures.
Note that impure substances are a combination of two or more pure substances not chemically combined together.
And, matter is classified into pure and impure substances.
Pure substances are classified into elements and compounds, while impure substances are classified into homogenous and heterogeneous substances.
Since solid X melts at a range of temperatures, solid X is an impure substance since pure substances melt at specific temperature.
So, the answer to the question what does this tell you about solid X is C. solid X is an impure substance
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Related Questions
Which element of the following would be the worst to use for pipes and fillings in the rainwater harvesting system? Explain by referring to the reactivity of each and to the nature of the ions that form. Support your answer using electronic configuration and periodic trends.
Aluminum, Copper, Lead
Answers
Out of the three elements you listed (aluminum, copper, and lead), lead would be the worst choice to use for pipes and fittings in a rainwater harvesting system.
Lead is highly reactive and prone to corrosion, which means it can break down and dissolve in water over time. When this happens, lead can leach into the water and be ingested by humans, animals, and plants. Lead is toxic and can have negative effects on the nervous system and other organs, so it is important to avoid using materials that contain lead in situations where it could come into contact with drinking water.
Copper and aluminum, on the other hand, are less reactive and less prone to corrosion. Copper has antimicrobial properties that can help prevent the growth of bacteria and other organisms in the water, and it is often used in plumbing systems for this reason. Aluminum is also a good choice for pipes and fittings in a rainwater harvesting system because it is lightweight, strong, and resistant to corrosion.
In terms of periodic trends, aluminum is the most electronegative element of the three, which means it is more likely to gain electrons and form positive ions. Copper is less electronegative and has a higher electron affinity, which means it is more likely to form negative ions when it reacts with other elements. Lead is less electronegative and has a lower electron affinity than copper, so it is less likely to form ions.
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Convert 0.0009 Mm to millimeters.
A. 900 mm
B. 900000 mm
C. 9 x 10^-13 mm
D. 900000000 mm
E. 90 mm
F.9 x 10-7 mm
G. 9000 mm
H. 9 x 10-10 mm
Answers
Answer:
0.0009 Meters =
0.9 Millimeters
What is the volume of a weather balloon that has 39 grams of helium with a density 0.017 g/mL?
Answers
Answer:
The answer is 235.29 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
\(volume = \frac{mass}{density} \\ \)
From the question.
density = 0.017 g/mL
mass = 4 g
We have
\(volume = \frac{4}{0.017} \\ = 235.2941176...\)
We have the final answer as
235.29 mLHope this helps you
me of an Irregular Solid
Use the image to determine the volume of the rock.
Initial volume:
mL
Final volume:
Volume of rock: 20
mL
cm³
Answers
The volume of the irregular solid from the image that have been shown is 12 mL
How do you determine the volume of an irregular solid?To obtain the volume of the irregular solid;
a. Measure the initial volume of water in the cylinder.
b. Carefully lower the irregular solid into the water, ensuring it is fully submerged without trapping any air bubbles.
c. Record the new volume of water in the cylinder.
d. The volume of the irregular solid is equal to the difference between the final and initial water volumes.
The volume is;
32 mL - 20 mL = 12 mL
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What is a ribosome?
A. an organelle of some eukaryotic cells in which photosynthesis occurs, using the
energy of light to make organic compounds from carbon dioxide and water
B. whiplike structures of cells that, through their movement. exert a force on the
fluid surrounding the cell. cither moving the fluid past the cell or moving the cell
within the fluid
C. membrane bound organelles in eukaryotic cells in which cellular respiration
takes placc, using oxygen to break down glucose to carbon dioxide and water
and putting the energy into a more readily usable forma ir ATP molecules
O a small prgandle, mace of RNA and protein and found in both prokaryotic and
cukanyctic cells that forms proteins from amino acids
Answers
When a substance an electron it energy which is an reaction. a)Absorbs; creates; chemical b)Gains: gains; oxidation c)Looses; looses; oxidation d)Looses; looses; reduction
Answers
When a substance gains an electron, it undergoes a reduction reaction. In a reduction reaction, a substance gains electrons, which results in a decrease in its oxidation state or an increase in its negative charge.
This process is often associated with the transfer of energy to the substance, as the gained electron brings additional negative charge and potential energy.
Reduction reactions are essential in various chemical and biological processes. For example, in cellular respiration, glucose is oxidized (loses electrons) while oxygen is reduced (gains electrons), leading to the release of energy for cellular activities. Similarly, reduction reactions play a crucial role in many other chemical reactions, such as the reduction of metal ions, the formation of covalent bonds, and the production of certain fuels.
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How do I convert μg/l to mol/kg?
Answers
Answer
To convert μg/l to mol/kg?
Step 1: from the mass in grams, find the number of moles by diving the mass by its molar mass
Step 2: To go from L to kg, take the volume given multiply it by density in kg/L
The Ostwald process is used commercially to produce nitric acid, which is, in turn, used in many modern chemical processes. In
the first step of the Ostwald process, ammonia is reacted with oxygen gas to produce nitric oxide and water.
What is the maximum mass of H₂O that can be produced by combining 78.3 g of each reactant?
4 NH3(g) + 5O₂(g) → 4 NO(g) + 6H₂O(g)
Answers
This makes the O2 the limiting reactant and the NH3 is present in excess since only 49.3 g of H2O can be produced.
What is Ostwald process?Nitric acid is produced chemically using the Ostwald process. The method was created by Wilhelm Ostwald, who patented it in 1902. The primary raw material for the most popular type of fertilizer manufacturing is provided by the Ostwald process, a mainstay of the contemporary chemical industry. Ammonia is transformed into nitric acid in two phases via the Ostwald process. Nitric oxide and nitrogen dioxide are produced by the oxidation of ammonia in step 1. The generated nitrogen dioxide is then absorbed in water in step 2. Nitric acid is the result of this.Therefore,
Once more, you must determine which reactant, if any, is limiting since they are giving you the masses of BOTH reactants.
produced from 73.0 g NH3 × 1 mol NH3/17 g × 6 mol H2O/4 mol NH3 × 18 g H2O/mol
Maximum quantity of H2O generated is 49.3 g at 73.0 g O2 × 1 mol O2/32 g × 6 mol H2O/5 mol O2 × 18 g H2O/mol.
This makes the O2 the limiting reactant and the NH3 is present in excess since only 49.3 g of H2O can be produced.
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What is the difference between enzyme and any other chemical catalyst?
Answers
Answer:
Enzymes and catalysts both affect the rate of a reaction. The difference between catalysts and enzymes is that enzymes are largely organic in nature and are bio-catalysts, while non-enzymatic catalysts can be inorganic compounds. ... Neither catalysts nor enzymes are consumed in the reactions they catalyze.
Explanation:
MARK ME
how many moles of chlorine gas react with 4.6 mol of hydrogen gas according to the balanced chemical equation?
Answers
The balanced chemical equation predicts a reaction between 4.6 moles of chlorine gas and 4.6 moles of hydrogen gas. In chemical equations, the factors are represented by symbols.
H2 (g) + Cl2 (g) 2 HCl is the equation for the balanced reaction.
According to the reaction's stoichiometry, which describes the proportions of reagents and products in a chemical equations, the following amounts of the compounds are involved in the reaction:
H₂: 1 mole
1 mole, chlorine
2 moles HCl
The rule of three can then be used as follows: 4.6 moles of H2 react with 1 mole of chlorine, so how many moles of CL2 do 4.6 moles of H2 react with,(4.6 moles of H2*1 mole of Cl2)/1 mole of H2 moles = moles of CL2.
moles of H2 = 4.6 moles
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For what order reaction does the half-life get longer as the initial concentration increases?
Answers
The half-life gets longer as the initial concentration increases in zero-order reaction.
The amount of time it takes for the concentration of a given reactant to reach 50% of its initial concentration is known as the half-life of a chemical reaction (i.e. the time taken for the reactant concentration to reach half of its initial value).
For zero order reaction:
The half-life is given as:
\(t_{1/2}=\frac{[A]_{0}}{2k}\) where k is the rate constant of the reaction and \([A]_{0}\) is the initial concentration.
As we can see that the half-life is directly proportional to the initial concentration. Therefore, when the initial concentration increases the half-life gets longer.
For the first-order reaction,
The half-life is given as:
\(t_{1/2}=\frac{\ln 2}{k}=\frac{0.693}{k}\)
A first-order reaction's half-life is independent of the initial concentration.
For a second-order reaction,
The half-life is:
\(t_{\frac{1}{2} }=\frac{1}{k[A]_{0}}\)
The initial concentration is inversely proportional to the half-life, so when the initial concentration increases the half-life will get shorter.
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What is the change in the cell voltage when the ion concentrations in the anode half-cell are increased by a factor of 10?.
Answers
The change in the cell voltage when the ion concentrations in the anode half-cell are increased by a factor of 10 is decreased by 0.030 V.
The electrochemical cell has both species the Fe²⁺ and Ag⁺ at 1 M concentration . the cell potential is given the standardbred cell potential E°.
at anode if the concentration increased by 10 then:
ΔE = -(R T / nF ) ln Q
now the reactions are :
at anode : Fe ---> Fe²⁺ + 2e
at cathode : 2 ( Ag⁺ + e ---> Ag)
overall : Fe + 2Ag⁺ ----> Fe²⁺ + 2Ag
Q = [Fe²⁺ ] / [Ag⁺]²
now, n = 2 , the change in cell potential is given as:
ΔE = ( -RT / nF ) ln [Fe²⁺ ] / [Ag⁺]²
[Fe²⁺ ] = 10 M
ΔE = -(8.314 × 298 ) / 2 × 96485 ln [10] / [1]
ΔE = - 0.030 V
Thus, the cell potential at anode half cell will decreased by 0.030 V.
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how many grams of sodium chlorate are required to generate 50.0 g sodium chloride according to the following equation: 2naclo3→2nacl 3o2
Answers
To generate 50.0 g of sodium chloride according to the given chemical equation, we need 91.12 g of sodium chlorate.
To calculate the grams of sodium chlorate required to generate 50.0 g of sodium chloride, we first need to use the balanced chemical equation to determine the molar ratio of sodium chlorate to sodium chloride. From the equation 2NaClO3 → 2NaCl + 3O2, we can see that for every 2 moles of sodium chlorate, 2 moles of sodium chloride are produced.
The molar mass of sodium chloride is 58.44 g/mol, and so 50.0 g of sodium chloride corresponds to 50.0 g / 58.44 g/mol = 0.8557 moles.
Since the molar ratio of sodium chlorate to sodium chloride is 2:2, or simply 1:1, we know that we need 0.8557 moles of sodium chlorate to generate 50.0 g of sodium chloride.
The molar mass of sodium chlorate is 106.44 g/mol, and so to convert moles to grams, we can simply multiply the number of moles by the molar mass. Therefore, we need:
0.8557 moles x 106.44 g/mol = 91.12 g of sodium chlorate.
Therefore, to generate 50.0 g of sodium chloride according to the given chemical equation, we need 91.12 g of sodium chlorate.
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What is the relationship between the kinetic energy of molecules in a solid and a liquid? Justify your response in two or more complete sentences.
will give brainliest
Answers
Answer:
Gases have more kinetic energy than liquids
Explanation:
Gases have more kinetic energy than liquids. Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces.
hope this helps
If a metal becomes an ion, what happens?
A. It gains protons and becomes positively charged
B. It loses protons and becomes negatively charged
C. It gains electrons and becomes negatively charged
D. It loses electrons and becomes positively charged
Answers
Below is a list of standard reduction potentials (E0') for biological half cell reactions.
Succinate + CO2 + 2 H+ + 2 e- --> alpha-ketoglutarate + H2O -0.67 V
Oxaloacetate + 2 H+ + 2 e- --> malate -0.17 V
Fumarate + 2 H+ + 2 e- --> succinate -0.03 V
Using the above information, answer the following questions:
(A) Which metabolite would spontaneously reduce oxaloacetate (OAA)?
(B) Based on your answer for (A), write the two half cell reactions and the resulting balanced reaction for the reduction of OAA.
(C) Calculate the standard reduction potential for the reaction chosen in (B)
Answers
A reaction to be spontaneous,overall cell potential must be positive.
(A)The metabolite which would spontaneously reduce oxaloacetate (OAA) is:
alpha-ketoglutarate
(B)The two half cell reactions are as follows:
Reduction half reaction:
Oxaloacetate + 2 H+ + 2 e- --> malate
Oxidation half reaction:
alpha-ketoglutarate --> Succinate + CO2 + 2 H+ + 2 e-
Overall resulting balanced reaction for the reduction of OAA :
Oxaloacetate +alpha-ketoglutarate --> malate + Succinate + CO2
(C)the standard reduction potential for the reaction chosen in (B):
+0.67-0.17 = +0.50 V
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would you expect an equilibrium vapor pressure to be reached above a liquid in an open container
Answers
In an open container, an equilibrium vapor pressure can be reached as long as the liquid has molecules capable of evaporating and the surrounding space allows for the escape and mixing of vapor molecules with the air.
Vapor pressure is the pressure exerted by the vapor molecules when the liquid and vapor are in equilibrium. It is a measure of the tendency of a liquid to evaporate. At any given temperature, molecules within the liquid have a range of kinetic energies. Some molecules have sufficient energy to overcome intermolecular forces and escape into the gas phase, forming vapor. As more molecules escape, the vapor density increases, creating a pressure known as the vapor pressure.
In an open container, the vapor molecules can freely escape into the surrounding space and mix with the air. Initially, the evaporation rate is high as molecules escape from the liquid surface. As the concentration of vapor molecules increases, collisions between the vapor and liquid surface also result in some molecules returning to the liquid phase, which is called condensation. Eventually, a dynamic equilibrium is established where the rate of evaporation and condensation become equal.
At this equilibrium, the vapor pressure above the liquid remains constant as long as the temperature is constant. The concentration of vapor molecules in the air above the liquid reaches a steady state, and the system is said to be saturated. The equilibrium vapor pressure is determined by the temperature and the characteristics of the liquid, such as its volatility and intermolecular forces.
Therefore, In an open container, an equilibrium vapor pressure can be reached above a liquid.
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This law relates a planet's orbital period and its average distance to the Sun.
The orbits of planets are ellipses with the Sun at one focus.
The speed of a planet varies, such that a planet sweeps out an equal area in equal time frames.
Answers
Answer:
These are Kepler's Laws of Planetary Motion
Explanation:
Answer:
its Keplers third law,
then first law,
then second law
Explanation:
CHEM help
i know how to report random answers btw
Answers
Answer:
ionic, they would make an ion
Explanation:
why is the dough fermented and proofed? at what temperature should fermentation take place, ideally?
Answers
Because it improves food preservation and breaks down the sugars in the dough, the dough is fermented and proofed.
The ideal temperature for fermentation is 85° F.
What is fermentation?
Anaerobic degradation of molecules like glucose occurs chemically during fermentation.
What is proofing?
When making yeast bread and other baked goods, the process of proving involves letting the dough rest and rise one last time before baking. While the dough is resting, yeast ferments it and releases gases, leavening the dough.
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what scientific term is uses to refer to the sharing of electrons between/ among atoms in order for the to attain stability?
Answers
Answer:
Covalent bonds
Explanation:
Covalent bonding
Covalent bond refers to mutual sharing of electrons between two atoms
What does the illustration indicate?
Answers
Answer: A
Explanation:
A gas mixture containing oxygen, nitrogen, and carbon dioxide has a total pressure of 42.9 kpa. what is the partial pressure of carbon dioxide if the partial pressure of oxygen is 6.6 kpa and the partial pressure of nitrogen is 23.0 kpa?
a. 29.6 kpa
b. 19.9 kpa
c. 13.3 kpa
d. 36.3 kpa
e. 14.3 kpa
Answers
Answer:
c
Explanation:
Whatever is left :
42.9 - 6.6 - 23 = 13.3 kpa
Answer:
13.3 kpa
Explanation:
What explanation from the evidence within the chemical equation BEST supports the idea that matter is conserved in a chemical reaction? A There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products. B There are the same number of elements in the reactants as there are in the products. C More reactants, hydrogen and oxygen, were added to make the product, water. D Two reactants, hydrogen and oxygen, combined to make one product, water.
Answers
Answer:
A There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products.
Explanation:
Matter is conserved in a chemical equation if there are no loss of atoms. That means, total number of atoms of elements must be the same as the total number of element on the product side. The correct option is;
A. There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products.
Answer:
its A. i just did dat
If 25. 5 mL of 0. 25 M H2SO4 (aq) reacts with 57. 9 mL of Fe(OH)3(aq), what is the concentration of the iron(III) hydroxide solution?
Answers
To determine the concentration of the iron(III) hydroxide solution, we can use the concept of stoichiometry and the balanced chemical equation for the reaction between sulfuric acid (H₂SO₄) and iron(III) hydroxide (Fe(OH)₃).
The balanced chemical equation for the reaction is as follows:
H₂SO₄ + Fe(OH)₃ → Fe₂(SO₄)₃ + 3H₂O
From the balanced equation, we can see that the stoichiometric ratio between H₂SO₄ and Fe(OH)₃ is 1:1. This means that for every 1 mole of H₂SO₄, we need 1 mole of Fe(OH)₃ to react completely.
Given the volume and concentration of H₂SO₄, we can calculate the number of moles of H₂SO₄ using the formula:
moles of H₂SO₄ = volume (in liters) × concentration
Converting the volume of H₂SO₄ to liters:
25.5 mL = 25.5 / 1000 = 0.0255 L
Calculating the moles of H₂SO₄:
moles of H₂SO₄ = 0.0255 L × 0.25 M = 0.006375 moles
Since the stoichiometric ratio between H₂SO₄ and Fe(OH)₃ is 1:1, we know that 0.006375 moles of H₂SO₄ will react with an equal number of moles of Fe(OH)₃.
Now, let's calculate the concentration of Fe(OH)₃ using the volume of Fe(OH)₃ given in the problem.
Converting the volume of Fe(OH)₃ to liters:
57.9 mL = 57.9 / 1000 = 0.0579 L
Since the number of moles of Fe(OH)₃ is the same as that of H₂SO₄ (0.006375 moles), we can calculate the concentration of Fe(OH)₃ using the formula:
concentration = moles/volume (in liters)
Concentration of Fe(OH)₃ = 0.006375 moles / 0.0579 L ≈ 0.11 M
Therefore, the concentration of the iron(III) hydroxide solution is approximately 0.11 M.
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Dos vehículos colisionan. Se sabe que antes del choque el vehículo 1 de masa "m", se desplazaba horizontalmente hacia la derecha con U1=10 m/s y el vehículo 2 cuya masa es el 30 % de la masa del vehículo 1, se desplaza horizontalmente hacia la izquierda con velocidad de 8m/s. Si hay pérdida de energía en la colisión, la expresión matemática que mejor representa dicha situación es:
Answers
Answer:
translate? ill edit this later
Explanation:
Does NaCI have a high melting point
Answers
Answer:
Yes, at 801 °C
Explanation:
how many moles in 85 grams of calcium
Answers
Mole present in 85 grams of calcium is 2.12 moles
It is given that
given mass of calcium = 85 grams
molar mass of calcium = 40 grams
We have to find the moles
The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12, its symbol is “mol”
moles = given mass/molar mass
moles = 85 gram/40 gram
moles = 2.12
Hence, moles in 85 grams of calcium is 2.12 moles
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1. A newspaper article wrote about a study in which researchers subjected laboratory gloves to stress. Among 240 vinyl gloves, 63% leaked. Among 240 latex gloves, 7% leaked. Calculate the claim that vinyl gloves have a higher leak rate than latex gloves. Use 0.005 significance level.
Answers
The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.
To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.
The z-value is calculated as:
z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))
where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.
Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.
For vinyl gloves:
Sample size (n₁) = 240
Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)
For latex gloves:
Sample size (n₂) = 240
Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)
We will calculate the z-value using the formula:
z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))
where p₁ and p₂ are the sample proportions.
p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629
p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071
Calculating the z-value:
z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))
z ≈ 13.239
The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.
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Which one of the following is a correct representation of an alpha particle? a. ⁴₂ He B.¹₀H c. ⁰₁ H D.⁰₋₁ H E. ²₄H
Answers
The correct representation of an alpha particle is option A: ⁴₂He.
How is an alpha particle represented?An alpha particle is a type of nuclear particle consisting of two protons and two neutrons, which is equivalent to a helium-4 nucleus. It is represented as ⁴₂He.
In the given options, option A (⁴₂He) correctly represents an alpha particle. The superscript 4 indicates the total number of nucleons (protons and neutrons), while the subscript 2 indicates the atomic number (number of protons) of the helium atom.
Option B (¹₀H) represents a hydrogen-1 nucleus, which consists of only one proton and no neutrons. Option C (⁰₁H) represents a hydrogen-1 atom with no charge, known as protium.
Option D (⁰₋₁H) represents a negative hydrogen ion (hydride ion) consisting of one proton and one extra electron. Option E (²₄H) represents hydrogen-2, also known as deuterium, which consists of one proton and one neutron.
Therefore, option A (⁴₂He) is the correct representation of an alpha particle.
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