B.10B

In a chemical equation, is it true that -

• the reactant side and product side can have different numbers of atoms for each element

• there can be different elements on the reactant side and the product side

• an element or compound must be accompanied by a phase change

• the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made

Tags

NGSS.MS-PS1-5

Which of the following is the general formula for a decomposition reaction?

• A + B  → AB

• AB → A + B

• AB + C → AC + B

• AB + CD → AC + BD

Tags

NGSS.MS-PS1-5

The following is what type of reaction:
NH₃ + HCl  → NH₄Cl

• Synthesis

• Decomposition

• Single Replacement Replacement

• Double Replacement Replacement

Which of the following describes a precipitate?

• a liquid forms when a block of metal is heated

• a solid forms when one liquid is poured into another

• a gas forms when a solid is placed in a liquid

• bubbles form when an acid is poured on a rock

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following models best demonstrates a balanced chemical equation?

• F

• G

• H

• J

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same

• that matter can only be changed into new substances by introducing a catalyst

• that matter exists in the same state throughout any chemical change

• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

Which type of reaction is shown?

• synthesis

• double replacement

• decomposition

• combustion

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

a precipitate is a (select two)

• solid forming from two aqueous solutions

• a sign of a chemical change

• a sign of a physical change

• an aqueous solution

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What chemical change makes a tree grow?

• photosynthesis

• cellular respiration

• oxygenation

• a tree growing is a physical change

Tags

NGSS.MS-LS1-6

Why is ice freezing ONLY a physical change? 

• The ice is colder than water. 

• It can stay cold when you put it in the freezer. 

• The molecules of water do NOT change. They only slow down and vibrate in position. 

• Its physical appearance does NOT change. 

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4