Answers TN-Physical Science SC 26-27 For CreditIntroduction to Chemical Reactions

Balancing Chemical Equations Answers

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One half of a balanced chemical equation is shown.3Mg(OH)2 + 2H3PO4Which lists the numbers of each atom the other half of the equation would contain?

3 Mg, 2 P, 14 O, 12 H

Mg, 2 P, 14 O, 6 H

3 Mg, 8 P, 7 O, 6 H

6 Mg, 6 P, 2 O, 12 H

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Substances A and B react in a ratio of A + B → AB. Colin was combining substance A and substance B to form substance AB. He added 10 g of substance A and 45 g of substance B.

10 g

35 g

45 g

55 g

If the mass of the products measured 120 g, what would be the mass of the reactants?

30 g

60 g

120 g

240 g

The equation below is for potassium oxide. 4K + O2 2K2O What is the ratio of atoms of potassium to atoms of oxygen?

1:2

2:1

4:1

1:4

Which best describes the law of conservation of mass?

The coefficients in front of the chemicals in the reactants should be based on the physical state of the products.

Products in the form of gases are not considered a part of the total mass change from reactants to products.

When reactants contain both a solid and a liquid, the solid counts toward the overall mass and the liquid does not.

The mass of the reactants and products is equal and is not dependent on the physical state of the substances.

Kiley wants to balance the equation H2 + N2 → NH3. Which would be her first step in balancing an equation?

multiplying the subscripts in the atoms of the reactants together

adding the coefficient 3 in front of H2 and the coefficient 2 in front of NH3

changing the subscripts so they match for the total number of atoms

creating a chart that shows the number of atoms in the reactants and products

Akia is balancing the equation Na + H2O NaOH + H2. He tries to find the coefficients that will balance the equation.How could he find the correct coefficients?

by counting each individual atom and making sure the number of each kind of atom is the same in the reactants and the products

by counting the total atoms and making sure the number of atoms in the reactants is the same as the number of atoms in the products

by counting the total mass of each compound and making sure the reactants have more mass than the products

by counting the mass of each atom and making sure the reactants are more massive than the products

The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and O2 gas. Which coefficients would be placed in front of water and oxygen?

2 in front of water and 2 in front of oxygen

1 in front of water and 2 in front of oxygen

1 in front of water and 1 in front of oxygen

2 in front of water and 1 in front of oxygen

The equation below shows a general equation for a reaction, and the amounts of the substance are written underneath. AB + CD → AC + BD(15 g) (?) (?) (10 g)The total mass of the products is 50g. Which best completes the other two amounts?

The amount of CD is 40 g, and the amount of AC is 35 g.

The amount of CD is 35 g, and the amount of AC is 40 g.

The amount of CD and AC would be the same.

The amount of CD and AC is undetermined.

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Balancing Chemical Equations Answers

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