Which of these is NOT a sign of a chemical reaction?

• A gas is given off

• The material dissolves

• Heat is released

• A color change occurs

Tags

NGSS.MS-PS1-2

The substance that is formed in a chemical reaction is called the

• polymer.

• reactant.

• product.

• radical.

Tags

NGSS.MS-PS1-2

In a balanced chemical equation, the mass of the reactant is equal to the

• atoms in a molecule.

• atomic mass of the elements.

• volume of the reactacts.

• mass of the products.

Tags

NGSS.MS-PS1-5

What happens in a chemical reaction?

• Atoms are destroyed.

• Atoms are created.

• Atoms are rearranged.

• Atoms gain/lose atomic mass.

Tags

NGSS.MS-PS1-5

The substance(s) on the right side of the arrow in a chemical equation is called the

• catalyst.

• precipitate.

• reactant.

• product.

Which of the following is NOT a "Tell-Tell" evidence of a possible chemical reaction?

• formation of a gas

• state of matter change

• formation of a solid

• color change

• temperature change

Tags

NGSS.MS-PS1-2

A balanced chemical reaction obeys the Law of

• Ideal Gases.

• Definite Proportions.

• Conservation of Matter.

• Conservation of Energy.

• Demand

Tags

NGSS.MS-PS1-5

What coefficient is missing in the following balanced chemical equation: 2Ni₂O₃ >>> 4Ni + __O₂

• 2

• 3

• 4

• 5

Tags

NGSS.MS-PS1-5

Give the ratio for the following equation:

Zn + 2HCl >>> ZnCl₂ + H₂

• 1:1:1

• 1:2:1

• 1:2:1:1

• 1:2:2:2

Tags

NGSS.MS-PS1-5

Which of the following equations is NOT balanced?

• Fe + S >>> FeS

• KOH + HCl >>> KCl + H₂O

• 2Mg + O₂ >>> 2MgO

• NaCl + H₂SO₄ >>> Na₂SO₄ + HCl

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5