Chemical Reactions

Identify this type of reaction: Fe + S → FeS

• synthesis

• decomposition

• combustion

Answer explanation

Note that there is only 1 product in this reaction.

In an exothermic reaction, energy is transferred from...

• the surroundings to the reactants

• the reactants to the surroundings

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Given 2 H₂O → 2 H₂ + O_2, if you start with 2 mol of H₂O, this many mol of H₂ are produced.

• 2

• 4

• 8

Answer explanation

The coefficients will indicate how many moles of a substance are needed or produced in a reaction.

Tags

NGSS.HS-PS1-7

A synthesis reaction between Mg and O₂ might produce....

• Mg₂

• MgO

• MgCO₂

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

All of these are likely to speed up the rate of reaction except...

• adding a catalyst

• decreasing the surface area

• increasing the pressure

• increasing the temperature

Tags

NGSS.HS-PS1-5

H₂ + Cl₂ → HCl... Balance this by stating the correct molar ratio.

• 1:1:2

• 2:1:2

• 1:1:1

Tags

NGSS.HS-PS1-7

Which is NOT true of enzymes?

• they are inefficient

• they can be reused

• they are affected by temperature

• they are proteins

The _______ of a molecule store chemical energy.

• electrons

• bonds

• nucleus

Tags

NGSS.HS-PS1-4

Balance this equation by stating the molar-ratio: Na₂SO₄ + AgCl → Ag₂SO₄ + NaCl

• 1:1:1:1

• 1:2:1:2

• 1:2:2:2

Tags

NGSS.HS-PS1-7

Digestion would be classified as this type of chemical reaction:

• synthesis

• decomposition

• combustion