Unit 4 Lessons 8 & 9 Stoichiometry Review

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled

• the product is half the mass of the reactants

• the mass is the same

• the mass changes depending on the reaction

Tags

NGSS.HS-PS1-7

Complete the sentence. **During a chemical reaction, atoms ________.**

• can appear

• can disappear

• get rearranged

• stop moving and vibrating

Tags

NGSS.HS-PS1-7

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Matter is not changed.

Tags

NGSS.HS-PS1-7

What is the right ratio of chemicals for the balanced chemical equation? __H_2 + __S → __H_2S

• 1,1 → 1

• 2,2 → 2

• 1,2 → 1

• 1,2 → 2

Tags

NGSS.HS-PS1-7

What coefficient should be used to make the following equation balanced? N_2 + O_2 → _NO

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Is the equation balanced?: 2H_2O + O_2 → 4MgO + 3Fe

• Yes

• No

Tags

NGSS.HS-PS1-7

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

• 1

• 2

• 3

• 4

Big coefficients represent

• The molar mass of each reactant and product

• The amount of grams of each reactant and product

• The moles of each reactant and product

• 1

• 4

• 8

• 16

Tags

NGSS.HS-PS1-7