Energy and Chemical Change

If two substances react and the temperature of the mixture increases, the reaction is

• Not one that produces anything new

• Exothermic

• One that needs a catalyst

• Endothermic

Tags

NGSS.MS-PS1-4

If two substances react and the temperature of the mixture decreases, the reaction is

• Endothermic

• Never going to happen unless it is heated

• Exothermic

• one that causes atoms to be destroyed

Tags

NGSS.HS-PS1-4

What is a sign of a chemical change?

• change in state of matter

• change in size

• change in shape

• temperature change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Metals can also react with acids. This produces a gas. What is the name of this gas?

• Hydrogen

• Carbon Dioxide

• Nitrogen

• Oxygen

Tags

NGSS.MS-PS1-2

The components of crude oil are separated through the process of _______

• hydraulic fracturing

• fractional distillation

• methane separating

• petroleum separation

Catalysts permit reactions to proceed along a ___________energy path.

• lower

• higher

Tags

NGSS.HS-PS1-4

According to collision theory, reactants must collide with proper orientation and sufficient _.

• activation energy

• temperature

• pressure

• surface area

Based on the following diagram, what is the function of potassium manganate (VII) crystals in this experiment?

• To supply oxygen

• To avoid the metals to mix with each other

• To release heat

• To give out water vapour

Tags

NGSS.HS-PS1-4

If the fork is to be electroplated with silver metal, what electrolyte should be used?

• Molten silver chloride

• Silver nitrate solution

• Sodium chloride solution

• Copper(II) sulphate solution

Tags

NGSS.HS-PS2-5

Name a metal that could be extracted from its metal oxide by heating with carbon.

• tin

• aluminium

• calcium

• magnesium