types of chemical reactions

Which generalized equation represents a decomposition reaction?

• A + BC → AC+ B
• A + B → AB
• AB → A + B

Tags

NGSS.MS-PS1-5

In a cold pack, which type of reaction draws heat from the surroundings?

• exothermic
• endothermic
• exergonic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-6

Photosynthesis is a chemical reaction that involves the production of glucose (sugar) from carbon dioxide and water in the presence of sunlight. Photosynthesis is what kind of reaction?

• Exothermic
• Endothermic
• Decomposition

Tags

NGSS.MS-LS1-6

NGSS.MS-PS1-2

What reaction has the following general formula:
 $C_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O$  

• Combination

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

Tags

NGSS.MS-PS1-2

What type of reaction involves ions from 2 compounds exchanging places to form 2 completely new compounds?

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

• Decomposition Reaction

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.MS-PS1-2

NGSS.MS-PS1-4

What does (aq) mean in a chemical reaction?

• Ag
• silver
• aqualirious
• aqueous

Tags

NGSS.MS-PS1-4

Which phrase describes what happens to atoms in a chemical reaction?

• never lost or gained, just rearranged

• sometimes lost, never rearranged

• sometimes lost, gained, or rearranged

• lost or gained, never rearranged

Tags

NGSS.MS-PS1-5

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

Tags

NGSS.MS-PS1-5

Which of the following is a compound?

• zinc (Zn)

• magnesium (Mg)

• sodium chloride (NaCl)

• potassium (K)