Reactants and Products Chemical Reaction

Which of these pairs represents the reactants of photosynthesis?

• Oxygen and water

• Glucose and oxygen

• Water and glucose

• Carbon dioxide and water

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following always results from a chemical reaction?

• Fire
• Bubbles
• A new substance that is a solid
• A new substance that can be a solid, liquid, or gas
  

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Chemistry is

• a characteristic of a substance that can be observed without changing the substance into another substance.
• the study of matter and how matter changes.
• anything that has mass and takes up space.
• a rapid reaction between oxygen and a substance called a fuel.
  

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

The only sure evidence for a chemical reaction is

• the formation of a gas.
• a color change.
• the production of one or more new substances.
• changes in properties.
  

Tags

NGSS.MS-PS1-2

The substances listed on the left side of a chemical equation are the

• Products
• Coefficients
• Precipitates
• Reactants

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.
• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• Matter is not changed.
  

Tags

NGSS.MS-PS1-5

When heated, oxygen reacts with copper to form copper oxide:
If this reaction occurs in a sealed container, will the mass of the container and everything in it increase, decrease, or stay the same and why?

• The mass will stay the same because the number of each kind of atom stays the same.
• The mass will increase because a new kind of molecule is formed.
• The mass will decrease because two substances combine to form one substance.
• More information is needed to tell if the mass will change.
  

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Identify the reactant(s) and product(s) of the reaction.

• All three are reactants and none are products.
• Hydrogen and water are the reactants, and oxygen is the product.
• Water and oxygen are the reactants, and hydrogen is the product.
• Hydrogen and oxygen are the reactants, and water is the product.
  

If reactants' mass is 18g , what is the mass of the products ?

• 15

• 36

• 81

• 18

Tags

NGSS.MS-PS1-5

What are the products of the chemical reaction pictured?

• CH₄ and CO₂

• CH₄ and O₂

• CO₂ and 2 H₂O

• O₂ and H₂O

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2