Answers GCSS_Physical Science_ICBalancing Chemical Equations

Balancing Chemical Equations Answers

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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

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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 equations are not balanced. Which equation would have the same coefficients in the same order as 2CO2 + 3H20 C2H6O + 3O2?

FeCl3 + NH4OH Fe(OH)3 + NH4Cl

CH4 + O2 CO2 + H2O

Fe + H2SO4 Fe2(SO4)3 + H2

PCl5 + H2O HCl + H3PO4

Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction?

The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.

The law of conservation of energy indicates the same amount of carbon will be found in the reactants as in the products.

The law of conservation of mass indicates the same amount of glucose will be found in the reactants as in the products.

The law of conservation of energy indicates the same amount of glucose will be found in the reactants as in the products.

Which is the balanced equation for V2O5 + CaS → CaO + V2S5?

V2O5 + CaS → CaO + V2S5

5V2O5 + 5CaS → 10CaO + 5V2S5

3V2O5 + 3CaS → 3CaO + 3V2S5

V2O5 + 5CaS → 5CaO + V2S5

Charlie is balancing an equation. She has identified the atoms and counted the number of each in the reactants and products. What would Charlie adjust to make the number of atoms in the reactants the same as the number of atoms in the products?

coefficients

subscripts

superscripts

parentheses

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

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

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

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

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