chemical Reactions

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?

• Reactants
• Products
• Atoms
• Catalysts

Tags

NGSS.HS-PS1-7

In a ___________change, a substance changes into a different substance.

• Physical
• Chemical

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

NGSS.HS-PS1-5

When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?

• a change of color
• a change of state
• a temperature decrease
• a temperature increase

Tags

NGSS.HS-PS1-4

What types of reactions absorb and release heat?

• acidic and basic
• endothermic and exothermic
• endothermic and heat transfusion
• covalent and ionic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.

• reactants
• products
• neutrals
• energizers

Tags

NGSS.MS-PS1-5

A change in the shape of an object is an example of _________________.

• a chemical change
• energy
• an endothermic change
• a physical change

A candle wick burning is an example of a _________________________

• physical reaction
• condensation
• neutrons
• chemical reaction

True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 

• true
• false

The left side of the equation below is called

• Products
• Reactants

Tags

NGSS.HS-PS1-7

The right side of the equation below is called the

• products
• reactants