Answer:
d) grass growing
Explanation:
i believe because everything else has something happening where it wasn't the same as before but grass is still the same color texture but its just longer
Out of the given options, the only process that does not involve a chemical change is salt dissolving in water. Salt merely changes its physical state, not its chemical identity, when it dissolves into water, thus representing a physical change.
Explanation:All of the mentioned options are examples of a chemical change except for one, which is a physical change. A chemical change is a process where one or more substances are transformed into new substances with different properties. Examples include taking an antacid for heartburn (A), as the antacid reacts chemically with stomach acid; cooking a steak (B), which includes the Maillard reaction, a chemical process; and grass growing (D), as it involves photosynthesis, a chemical process.
A physical change, on the other hand, is a type of change in which the form of matter is altered but one substance is not transformed into another. The correct answer is C) Salt dissolving in water. In this case, the salt (sodium chloride) simply changes its state from solid to liquid but not its identity. After all, if the water were to evaporate, you'd be left with the salt crystal structure again intact. Thus, this is not a chemical change but a physical one.
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Which of the following is true for balancing equations? A. The number of products should be equal to the number of reactants. B. The properties of products should be the same as the properties of reactants. C. There must be as equal number of compounds on both sides of the equation. D. There must be as equal number of atoms of each element on both sides of the equation.
D.) There must be an equal number of atoms of each element on both sides of the equation
Answer: The correct answer is Option D.
Explanation:
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another.
In a chemical reaction, total mass on the reactant side is equal to the total mass on the product side.
It can also be stated that total number of individual atoms on the reactant side must be equal to the total number of individual atoms on product side.
For Example: Formation of water from hydrogen and oxygen gas.
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
On reactant side:
Number of Hydrogen atoms = 4
Number of Oxygen atoms = 2
On product side:
Number of Hydrogen atoms = 4
Number of Oxygen atoms = 2
Hence, the correct answer is Option D.
Two students are given different samples of a substance and are instructed to determine the properties of the substance.
The complete question is given below:
Two students are given different samples of a substance and are instructed to determine the properties of the substance.
Which statement describes a property that will be the same for both students?
A. color because it is an extensive property
B. mass because it is an extensive property
C. boiling point because it is an intensive property
D. volume because it is an intensive property .
ANSWER
The correct option is C.
The physical properties of substances are divided into two, intensive and extensive properties.
Intensive properties refers to those features of a substance that do not depend on the quantity of the material that is available. Whether the sample available is big or small, the intensive properties remain the same. Examples of intensive properties are: melting point, boiling point, refractive index, hardness, density color, etc. This question is asking us to look for an intensive property.
Extensive properties refers to those characteristics of a substance that depend on the amount of substance present. Examples of these properties are: mass, volume, size, weight, length, etc.
From the options given, option A is wrong because color is not an extensive property, it is intensive. Option B is wrong because the mass depend on the amount of sample given and the same thing apply to option D.
The correct option is C, because no matter the quantity of that substance that you have, the boiling point will always remains the same.
Answer:
C
Explanation:
According to the law of mass action,what must be equal at equilibrium?
Answer:
The mass action law states that if the system is at equilibrium at a given temperature, then the following ratio is a constant. The square brackets "[ ]" around the chemical species represent their concentrations. This is the ideal law of chemical equilibrium or law of mass action.
Explanation:
Final answer:
The law of mass action states that the equilibrium constant must be equal at equilibrium.
Explanation:
The law of mass action states that at equilibrium, the ratio of the concentrations of the products to the concentrations of the reactants is constant. This constant is known as the equilibrium constant (Keq), and it must be equal at equilibrium. The equilibrium constant expression is based on the balanced chemical equation for the reaction and relates the concentrations of the products and reactants.
Which statement describes potential energy? A. energy of motion B. stored energy C. energy due to heat D. used energy
A. Energy of motion describes potential energy
B is the answer.
potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.
How do i solve these chemistry problems
What you have to do is balance the chemical equations to make sure everything is even on both sides. If you want me to help you answer the questions comment back
What happens in an oxidation half-reaction?
A.
Elements gain electrons.
B.
Elements lose electrons.
C.
Oxygen is added.
D.
Oxygen is lost.
B.
Elements lose electrons.
What is the center of the atom called?
A. Electron
B.Neutron
C.Nucleus
D.Proton
Study the image. Which region has the highest elevation
Can you please provide an image it would help more than you know
Answer:
THIS IS THE IMAGE IF THIS HELPS
the average amount of kinetic energy of each particle of a substance is thermometer, anemometer, temperature or convection?
anemoter because that is where kinetic energy comes from
please give me branliest
What is the missing coefficient ?
The missing coefficient in this chemical equation will be the number that makes the number of Carbons and Oxygens equal on both sides. To start, we can tally what we have so far and then we can figure out what number we need.
2 C8H18 + 25 O2 --> ____ CO2 + 18 H2O
On the left, we have 16 Carbons, 36 Hydrogens, and 50 Oxygens.
On the right, we have 36 Hydrogens and 18 Oxygens (as of now).
This means we need 16 Carbons and 32 Oxygens on the right side of the equation to make the individual numbers equal; this can be accomplished by putting 16 as the CO2 coefficient (this adds 16 Carbons and 32 Oxygens). To check yourself, re-count the number of each atom on each side.
Left: 16 Carbons, 36 Hydrogens, 50 Oxygens
Right: 16 Carbons, 36 Hydrogens, 50 Oxygens
The numbers on both sides are equal, so 16 satisfies the CO2 coefficient and the chemical equation is now balanced. We're done!
Hope this helps!
A metallurgist reacts 320.0 grams of 75.0% by mass silver nitrate solution with an excess of copper metal. How many grams of silver metal can the metallurgist produce during the process?
Cu(s) + AgNO3 → Ag(s) + Cu(NO3)2
97.5 grams
125 grams
149 grams
152 grams
Answer:
= 152.40 g
Explanation:
The equation for the reaction is;
Cu(s) + AgNO3 → Ag(s) + Cu(NO3)2
Mass of silver nitrate = 320.0 g × 0.75
= 240.0 g
Molar mass of silver nitrate = 169.87 g/mol
Therefore;
Moles of silver nitrate = 240.0 g/169.87 g/mol
= 1.413 moles
Mole ratio of Silver nitrate to silver metal = 1 : 1
Therefore, moles of silver metal = 1.413 moles
Hence;
Mass of silver metal = 1.413 moles × 107.868 g/mol
= 152.40 g
To determine the amount of silver metal produced, use stoichiometry and the given information to convert the mass of silver nitrate solution to moles, use the mole ratio from the balanced equation to find the moles of silver, and then convert the moles of silver to grams using the molar mass of silver. The metallurgist can produce 152 grams of silver metal.
Explanation:To determine the amount of silver metal that can be produced, we need to use stoichiometry and the given information. The balanced equation tells us that 1 mole of copper reacts with 1 mole of silver nitrate to produce 1 mole of silver. Therefore, we can convert the given mass of the silver nitrate solution to moles and then use the mole ratio to find the moles of silver produced. Finally, we can convert the moles of silver to grams using the molar mass of silver.
Step 1: Convert the mass of silver nitrate solution to moles using its molar mass.
Step 2: Use the mole ratio from the balanced equation to find the moles of silver produced.
Step 3: Convert the moles of silver to grams using the molar mass of silver.
Using these steps, we can calculate the amount of grams of silver metal produced, which is 152 grams.
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What is the percent composition of each element in S2Br
Get the molar mass of each element and since there are two S for each Br, make it 2x32.06 + 1x79.90 and then for S2, you would get 64.12/144.02 which is 44.52% S2 and then 55.48% Br
what is the molarity of 3 moles of nacl in 12 liters of water
Molarity=Moles of solute
Volume of SOLUTION
And we get an answer with units, mol⋅L−1
Explanation:
So all we need to do is to set up this quotient. You have been given the amount of solute in moles, and the volume of solution.
So, Molarity=3⋅mol
4⋅L. =??mPol⋅L−1?In 1L of this solution, what is the mass of the NaCl solute?
M= 3 Moles/ 12 Liters = 0.25 M
What is the mass percent of each element in water
Mass Percent of Hydrogen. To find the mass percent of hydrogen in water, take the molar mass of hydrogen in the water molecule, divide by the total molar mass of water, and multiply by 100. Dividing 2.016 by 18.016 gives you 0.1119. Multiply 0.1119 by 100 to get the answer: 11.19 percent
Which of the following is similar among all living organisms on Earth?
A. cellular function
B. social behavior
C. physical appearance
D. all of these
A. cellular function
hope this helps :)
use the multiplication law of exponents to solve the expression below. 9^1/2 × 9^1/2
The expression[tex]9^{1/2} \times 9^{1/2[/tex] simplifies to 9¹ by adding the exponents, because they have the same base, resulting in the value of 9.
To solve the expression [tex]9^{1/2} \times 9^{1/2[/tex] using the multiplication law of exponents, you add the exponents when the bases are the same.
Since the base here is 9 and both exponents are 1/2, you would add the exponents: 1/2 + 1/2 = 1.
Therefore, [tex]9^{1/2} \times 9^{1/2[/tex]simplifies to 9¹, which is just 9.
which is the correct set of products for the acid - base neutralization reaction between hydrochloric acid (HCl) and calcium hydroxide Ca (OH)2?
A -
CaH and HCl
B -
CaCl, and H2O
C -
CaCl2 and H2O
D -
CaCl2 and H3O2
The correct equation is
Ca(OH)2 + 2HCl ====> CaCl2 + 2H2O
You are not required to deal with balance numbers so the correct answer is C.
Answer:
c
Explanation:
i done this on usa testprep
what two factors are multiplied to determine wave speed?
Answer:
Explanation:
what two factors are multiplied to determine wave speed?
what is used to measure solution concentration in chemistry
molarity contains the number of moles of solute per liter of solution or moles per liter and it is one of the most common units used to measure the concentration of a solution.
How many grams of solute are in 250mL of 2.0M of CaCi2?
How many grams of solute are in 500.0 mL of a 4.4M solution of K2SO4?
Answer:
1) 55.49 g.
2) 383.37 g.
Explanation:
Molarity is the no. of moles of solute in a liter of the solvent.
Molarity (M) = (n of solute)/(Volume of the solution (L))= (mass/molar mass)solute x (1000/V of the solution(ml))
1) How many grams of solute are in 250 mL of 2.0 M of CaCl₂?
∵ M = (mass/molar mass)CaCl₂ x (1000/V of the solution(ml))
M of CaCl₂ = 2.0 M, V of the solution = 250.0 mL, molar mass of CaCl₂ = 110.98 g/mol.
∴ mass of CaCl₂ = (M)(V of the solution (ml))(molar mass of CaCl₂)/1000 = (2.0 M)(250.0 mL)(110.98 g/mol)/(1000) = 55.49 g.
2) How many grams of solute are in 500.0 mL of a 4.4 M solution of K₂SO₄?
∵ M) = (mass/molar mass)K₂SO₄ x (1000/V of the solution(ml))
M of CaCl₂ = 4.4 M, V of the solution = 500.0 mL, molar mass of K₂SO₄ = 174.259 g/mol.
∴ mass of K₂SO₄ = (M)(V of the solution (ml))(molar mass of K₂SO₄)/1000 = (4.4 M)(500.0 mL)(174.259 g/mol)/(1000) = 383.37 g.
When forming a chemical bond only the
blank electrons participate in the bonding process
A chemical bond is created by either the transfer or sharing of electrons. Electrons with a missing full outer shell will be the ones participating in the bonding process. Hope this helped :)
Why do crocodiles walk so gayly?
I swear they walk like they got their nails done or something
Answer:
who knows why they could be or not or maybe they girl crocs and just got there nails done
Animals like crocodiles have different ways of moving depending on their body structure, how their bodies work, and how they have evolved over time.
Why do crocodiles walk so gayly?Crocodiles have a special way of walking that is affected by how their legs are built and where they live. They can move smoothly both in water and on land.
This unique way of walking is a result of their evolutionary adaptations for life in aquatic and semi-aquatic environments. In water, crocodiles use powerful tail movements for propulsion, and on land, they can move swiftly and silently to capture prey or protect their territory.
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James Proton prepares a saturated solution of sodium chloride in a beaker by adding solid sodium chloride and stirring. When James finishes, crystals of sodium chloride are observed at the bottom of the beaker. Which statement is true regarding the solution?
A. The concentration of sodium ions is constantly changing.
B. The concentration of chloride ions is constantly changing.
C. Solid sodium chloride never dissolves to form sodium ions and chloride ions.
D. Sodium ions and chloride ions collide and combine to form solid sodium chloride.
Your answer is choice C. That is solid sodium chloride never dissolves to form sodium ions and chloride ions.
Going further to explain, have a look at the question again, we are told that James Proton prepares a saturated solution of sodium chloride in a beaker by adding solid sodium chloride and stirring.
Then when James finishes, crystals of sodium chloride are observed at the bottom of the beaker.
This implies that no more salt was dissolving since the saturation point was reached.
Again suppose he increased the temperature of the reaction, more salts could have dissolved.
Correct option is D. The solution has reached equilibrium, meaning the concentration of sodium ions and chloride ions remains constant, and recrystallization occurs as these ions collide and combine to form solid sodium chloride.
When James Proton prepares a saturated solution of sodium chloride and observes crystals at the bottom of the beaker, the solution has reached a point of equilibrium where the dissolution of solid sodium chloride into sodium ions (Na+) and chloride ions (Cl-) is equal to the rate of recrystallization where these ions recombine to form solid sodium chloride. This equilibrium state means that the concentration of sodium ions and chloride ions in the solution remains constant, not constantly changing. Hence, options A and B are incorrect. Option C is also incorrect since the observation of crystals indicates that dissolution did occur before reaching saturation. The correct statement regarding the solution is D: Sodium ions and chloride ions collide and combine to form solid sodium chloride, which is an explanation of the recrystallization process occurring at equilibrium in a saturated solution.
what is the oxidation number for chromium in each of these compounds. show your work. A. K2CrO4 B.Cr2O3
Answer:
A. + 6.
B. + 3.
Explanation:
A. K₂CrO₄:
To calculate the oxidation no. of an element in a compound:We have that the sum of the oxidation no. of different elements in the compound multiplied by its no. is equal to the overall charge of the compound.
∵ 2(oxidation no. of K) + (oxidation no. of Cr) + 4(oxidation no. of O) = 0.
oxidation no. of K = + 1, oxidation no. of O = - 2.
∴ 2(+ 1) + (oxidation no. of Cr) +4(- 2) = 0.
∴ 2 + (oxidation no. of Cr) - 8 = 0.
∴ (oxidation no. of Cr) - 6 = 0.
∴ oxidation no. of Cr = + 6.
B. Cr₂O₃:
∵ 2(oxidation no. of Cr) + 3(oxidation no. of O) = 0.
oxidation no. of O = - 2.
∴ 2(oxidation no. of Cr) + 3(- 2) = 0.
∴ 2(oxidation no. of Cr) - 6 = 0.
∴ 2(oxidation no. of Cr) = + 6.
∴ (oxidation no. of Cr) = + 6/2 = + 3.
Final answer:
The oxidation number of chromium (Cr) in K2CrO4 is +6 and in Cr2O3 is +3, determined by the algebraic method accounting for the known oxidation states of other elements and the neutrality of the compounds.
Explanation:
To determine the oxidation number of chromium (Cr) in each compound, we can use the rules for assigning oxidation numbers and do some algebraic calculations.
K2CrO4
For K2CrO4, potassium (K) usually has an oxidation number of +1. Since there are two potassium atoms, their total is +2. Oxygen (O) typically has an oxidation number of -2, and since there are four oxygen atoms, their total is -8. The compound must be electrically neutral, so the sum of the oxidation numbers must be zero. This leads to the equation:
(2)(+1) + Cr + (4)(-2) = 0 --> 2 + Cr - 8 = 0 --> Cr = +6
Therefore, the oxidation number of Cr in K2CrO4 is +6.
Cr2O3
For Cr2O3, we again assign an oxidation number of -2 to oxygen. With three oxygen atoms, their total is -6. The compound is neutral, so the total oxidation number must be zero. The equation would be:
2(Cr) + (3)(-2) = 0 --> 2Cr - 6 = 0 --> Cr = +3
Thus, each chromium atom in Cr2O3 has an oxidation number of +3.
which of the following compounds has the highest oxygen content by weight?
The molecular weight is 18, and 16 of that is oxygen.
So, water is 16/18 * 100 = 88.9% oxygen by weight.
None of the other compounds have as high an oxygen content (by weight) as water.
This is a trick question, and the University Chemistry grad fell for it.
If you have the same weight of each compound (let's say, 10 grams, for example), then H2O has the most oxygen weight (8.89 g).
Answer:
This question is incomplete. The completed question is below
Which of the following compounds has the highest oxygen content, by weight? a. NaO b. CO c. BaO d. H₂O
The correct option is d. H₂O
Explanation:
The percentage of oxygen by weight in NaO is
atomic mass of sodium (Na) is 23 g/mol while that of oxygen is 16 g/mol
molar mass of NaO = 23 + 16 = 39g
% by mass of oxygen = 16/39 × 100 = 41.03 %
The percentage of oxygen by weight in CO is
atomic mass of carbon (C) is 12 g/mol while that of oxygen is 16 g/mol
molar mass of CO = 12 + 16 = 28g
% by mass of oxygen = 16/28 × 100 = 57.14 %
The percentage of oxygen by weight in BaO is
atomic mass of barium (Ba) is 137 g/mol while that of oxygen is 16 g/mol
molar mass of BaO = 137 + 16 = 153g
% by mass of oxygen = 16/153 × 100 = 10.46 %
The percentage of oxygen by weight in H₂O is
atomic mass of Hydrogen (H) is 1 g/mol while that of oxygen is 16 g/mol
molar mass of H₂O = (2 × 1) + 16 = 18g
% by mass of oxygen = 16/18 × 100 = 88.89 %
From the above calculations, it can be deduced that H₂O has the highest oxygen content by weight
Which two formulas contain 4 atoms of hydrogen
Methane CH4 1 carbon atom : 4 hydrogen atoms
Sulfuric acid H2SO4 2 hydrogen atoms : 1 sulfur atom: 4 oxygen atoms
Methane CH4 1 carbon atom : 4 hydrogen atoms
Sulfuric acid H2SO4 2 hydrogen atoms : 1 sulfur atom: 4 oxygen atoms
HOPE THIS HELPED!! XD
Can I have brain? please
a gas has a pressure of 1.5 atm, and occupies a volume of 16 L. what will be the new pressure if the volume decreases to 10 L
Answer:
2.4 atm
Explanation:
The ideal gas law will be applied here. We expect the gas to have a higher pressure because the volume has been reduced for the same amount of gas at a constant temperature (assumption).
P₁V₁ = P₂V₂
1.5 * 16 = P₂ * 10
P₂ = (1.5 * 16) /10
P₂ = 2.4 atm
does more precipitation occur over oceans or over land? Explain
Calculate the concentration of hydronium and hydroxide ions in a 0.050 M solution of nitric acid.
Final answer:
The concentration of hydronium ions (H3O+) and hydroxide ions (OH-) in a 0.050 M solution of nitric acid is 0.050 M and 2.0 × 10^-13 M, respectively.
Explanation:
The concentration of hydronium ions (H3O+) and hydroxide ions (OH-) in a solution can be determined using the equation for water dissociation:
Kw = [H3O+][OH-]
For a strong acid like nitric acid (HNO3), it completely dissociates in water, so the concentration of hydronium ions is equal to the initial concentration of the acid:
[H3O+] = 0.050 M
Since the concentration of hydronium ions and hydroxide ions in a neutral solution is equal (Kw = 1.0 × 10^-14), the concentration of hydroxide ions can be calculated
[OH-] = Kw / [H3O+]
[OH-] = (1.0 × 10^-14) / (0.050) = 2.0 × 10^-13 M
Therefore, in a 0.050 M solution of nitric acid, the concentration of hydronium ions is 0.050 M and the concentration of hydroxide ions is 2.0 × 10^-13 M.
which phrase best to find a star system
Assuming the answers are:
a group of hundreds of stars a group of two or more stars
a group of stars that formed around the same time
a group of two stars in which one star is brighter than the other
The correct answer is b:
a group of stars that formed around the same time