Intro to Chemistry Practice

The reaction Cl₂(g) + 2KBr(aq) -> 2KCl(aq) + Br₂(l) is a(n)

• synthesis reaction

• decomposition reaction

• single-replacement reaction

• double-replacement reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

The reaction Pb(NO₃)₂(aq) + 2KI(aq) -> PbI₂(s) + 2KNO₃(aq) is a

• synthesis reaction

• combustion reaction

• single-replacement reaction

• double-replacement reaction

Tags

NGSS.MS-PS1-2

Which statement describes a chemical property of aluminum?

• Aluminum is malleable

• Aluminum has a high density

• Aluminum reacts with sulfuric acid

• Aluminum conducts an electric current

The formation of water from oxygen and hydrogen can be described in the following word equation:

 

oxygen gas+ hydrogen gas → liquid water

• product

• reactant

• waste

• only a compound

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

When investigating a chemical reaction, one would expect the products to have

 

• The same properties as the reactants have separately

• a mixture of the properties of the reactants

• different properties than the reactants have separately

• the same properties as only one of the reactants

Tags

NGSS.MS-PS1-2

The data from an investigation on the reaction of sodium and chlorine is shown in the table above.  The data in the table gives evidence to support the fact that

• compounds have different properties than the elements that make them up

• crystals are formed whenever solids react with gases

• once a compound is formed it cannot be chemically separated into the elements from which it is made.

• chlorine has a higher melting point than sodium

Tags

NGSS.MS-PS1-2

The chemical word equation for the process of photosynthesis is:carbon dioxide + water → glucose + oxygen

The reactant(s) for the process of photosynthesis

 

• are glucose and oxygen

• is glucose only

• is water only

• are water and carbon dioxide

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following is a physical property of water?

• It reacts with calcuim metal to produce a basic solution

• It can be decomposed by electrolysis

• It forms a new compound when reacted with Magnesium

• It melts below room temperature

Tags

NGSS.MS-PS1-4

Which action represents a chemical change?

• melting gold

• running an electrical current through copper wire

• iron rusting in the course of time

• breaking an ice cube into smaller pieces

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Some properties are the same in a substance no matter the amount of the substance. Which of the following characteristics does not change based on the amount of the substance?

• Mass

• Volume

• Density

• Weight