Chemical Reactions

According to the law of conservation of mass, matter cannot be created or (a)  

Tags

NGSS.MS-PS1-5

True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.

• True

• False

Tags

NGSS.MS-PS1-5

Which of the following is not evidence of a chemical reaction?

• Formation of a precipitate
• Production of gas
• Change in temperature
• Change in state of matter

Tags

NGSS.MS-PS1-2

Translate the following word equation: 
Liquid nitrogen and oxygen gas combine to form nitrogen monoxide gas. 

• N + O → NO
• N₂ + O₂ → N₂O₂
• N_2(l) + O_2(g) → NO_(g)
• N_(l) + O_2(g) → NO_(g)

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

NGSS.MS-PS1-1

Mass cannot be ____ or _____.

• made, changed
• created, destroyed
• rearranged, unmade
• stagnant, unchanging

Tags

NGSS.MS-PS1-5

Balance the following equation:
____MgO + ____H₂O → ____Mg(OH)₂

• 1,1,1
• 1,2,2
• 2,3,4
• 2,2,2

Tags

NGSS.MS-PS1-5

A precipitate is...

• a solid that falls out of a liquid solution
• a reactant in a reaction
• a clear substance
• the mass of a product

A chemical change is different than a physical change because in a chemical change

• chemicals are used

• molecules do not physically touch

• a new substance is formed and in a physical no new substance is formed

• the change can be seen but in a physical change it cannot

Which of the following 2 are chemical reactions?

• sugar dissolving in water

• water turning into steam

• burning wood

• mixing baking soda and vinegar

• tearing paper

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

In a chemical reaction, if the reactants are heated, the reaction usually happens

• slower

• faster

• at the same rate

• in a smaller volume

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4