Chemical Reactions Review

What is a reactant?

• what is produced from a chemical reaction 
• the substances in a chemical reaction.
• what you use to find the arrow 

(reactants ----> products)
 is how you would write the eqution?

• true
• false

Tags

NGSS.HS-PS1-7

Do all reactions have to follow the Law of conservation of Mass

• yes, they do have to follow it
• no, they dont have to follow it 

Tags

NGSS.HS-PS1-7

You are allowed to change the subscripts to balance the equation 

• false 
• true

Tags

NGSS.HS-PS1-7

What is the Law of conservation of Mass

• mass cant be created or destroyed in a chemical reaction

• you must add all the masses together

• you must multiply the masses together

Tags

NGSS.HS-PS1-7

The yield symbol is....

•  :
• ---->
• #
• +

Reactions that give out heat to the surrounding are classified as one of the following:

• Spontaneous
• Sluggish
• Exothermic
• Endothermic

Tags

NGSS.HS-PS1-4

To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water
• Place the products in ice bath
• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod

Tags

NGSS.HS-PS1-5

What is concentration?

• Refers to the number of reactants in a given volume
• Refers to the number of particles in a given volume
• Refers to the number of factors in a given volume

Tags

NGSS.HS-PS1-5

particles that move faster because of temperature are 

• not likely to react  
• likely to react 
• not likely to react and collide
• likely to react and collide

Tags

NGSS.HS-PS1-5