Reactions

Mercury reacts with oxygen to form mercuric oxide. Is this a combustion reaction?

• yes

• no

What are the products of any combustion reaction involving a hydrocarbon?

• Carbon dioxide

• Carbon trioxide

• Water

• Carbon monoxide

The main component of natural gas is nitrogen

• true

• false

Carbon-containing materials undergo incomplete combustion when__________________.

• There is an excess of oxygen.

• There are sulfur impurities.

• The carbon-containing materials is a gas.

• There is insufficient oxygen.

In an exothermic reaction, the reactants have more stored chemical energy than the products.

• true

• false

Tags

NGSS.HS-PS1-4

All combustion reactions are exothermic reactions.

• true

• false

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Which is a general equation for an exothermic reaction?

• products → reactants + energy

• products → reactants - energy

• reactants → products - energy

• reactants → products + energy

Tags

NGSS.HS-PS1-4

In a combustion reaction, a substance combines with_________ and releases energy in the form of heat and light.

• fire

• oxygen

• carbon

• metal

Tags

NGSS.MS-PS1-5

Which is an example of an endothermic reaction?

• chemical reaction that causes an instant ice pack to get cold when squeezed

• squeezing the cold pack breaks an inner bag of water

• burning of wood

• two of these

Tags

NGSS.HS-PS1-4

Which is a general equation for an endothermic reaction?

• Products - Energy → reactants

• Reactants + Energy → products

• Reactants - Energy → products

• Products + Energy → reactants

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1