Reactions review

A chemical reaction in which energy is absorbed in the form of heat is called

• synthetic.

• exothermic.

• combustion.

• endothermic.

Tags

NGSS.HS-PS1-4

Chemical equations are balanced because they demonstrate

• activation.

• conservation of matter.

• decomposition.

• mass coefficients.

Tags

NGSS.HS-PS1-7

Which is an example of a chemical change?

• food spoiling

• water freezing

• mercury rising in a thermometer

• butter softening

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are the missing coefficients?

_ Fe + _ Cl₂ --> _ FeCl₃

• 3, 2, 2

• 4, 2, 2

• 2, 3, 2

Tags

NGSS.HS-PS1-7

Which of the following cannot be used to put out a small fire?

• water

• carbon dioxide

• baking soda

• oxygen

Tags

NGSS.HS-PS3-4

What term belongs in position E?

• Reactants

• Products

• Yields

• Coefficient

• Subscript

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS1-1

When Lead nitrate and potassium iodide react a yellow solid is formed. What is the yellow substance?

• Lead iodide

• Lead Nitrate

• Potassium iodide

• potassium nitrate

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

The reaction in which two or more substances combine to form a more complex substance is called a

• decomposition reaction.

• replacement reaction.

• synthesis reaction.

• physical reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Would cold packs be considered endothermic or exothermic?

• Endothermic

• Exothermic

Tags

NGSS.HS-PS3-4

Which of the following is a balanced equations?

• H₂O₂ --> H₂O + O₂

• 2 Fe₂O₃ + 3 C --> 4 Fe + 3 CO₂

• 2 Mg + HCl --> MgCl₂ + H₂

Tags

NGSS.HS-PS1-7