Daily Spark Science 8 Unit Review 2 day 2

What is it? An element, a compound, or a mixture? Noble Gas

• element

• compound

• mixture

• none

What is it? An element, a compound, or a mixture? Salt dissolved in water.

• Element

• compound

• mixture

• none

What is it? AN element, a compound, a mixture? hydrogen chemically combined with oxygen

• an element

• compound

• mixture

• none

Tags

NGSS.MS-PS1-1

Which statement best describes the change to an ice cube as it melts?

• The change is physical because the mass remains the same

• The change is chemical because the substance remains the same.

• The change is chemical because ice has a lower density than water

• The change is chemical because water has a different pH than ice.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following is a balanced chemical equation?

• Na + Cl2 --> 2NaCl

• Hg(NO₃)₂ + 2KI --> HgI₂ + 2KNO₃

• C₃H₈ + O₂ --> CO₂ + H₂O

• 2NH₃ + Cl₂ --> N₂H₄ + NH₄Cl

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Identify the reactants in the following chemical equation:

CH₄ + 2O₂ --> CO₂ + 2H₂O

• CH₄

• CO₂

• 2O₂

• H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Ionic bonds form between which two types of elements?

• a metal and a nonmetal

• two nonmetals

• two metals

• cats and dogs

Tags

NGSS.MS-PS1-5

Covalent bonds form between which two types of elements?

• a metal and a nonmetal

• two nonmetals

• two metals

• cats and dogs

exothermic reaction

• a chemical bond that results from the sharing of electrons - non metal bonded to non metal

• a chemical reaction in which heat is released to the surroundings

• Write a balanced equation for the reaction of sodium and water.

• Two metals bond by sharing a "sea" of electrons

Tags

NGSS.MS-PS1-4

Law of Conservation of Mass

• They normally gain electrons during chemical reactions. Usually form negative ions.

• a device that initiates and maintains a controlled nuclear fission chain reaction to produce energy for electricity

• Write a balanced equation for the reaction of sodium and water.

• the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5