Science Homework Help

1) Which answer best completes the sentence below?

An example of an intensive physical

property is _____ while an example of an extensive physical property is _____.

1) 

mass, smell

2) 

color, boiling point

3) 

density, volume

4) 

shape, length

2) Which answer best completes the following sentence?

_____ is an example of physical change while _____ is an example of a chemical change.

1) 

Evaporating rubbing alcohol, boiling nitrogen

2) 

Burning wood, dissolving salt in water

3) 

Boiling water, rusting of iron

4) 

Bending a piece of aluminum, condensing water vapor

3) The color and boiling point of a substance are both examples of

1) 

intensive properties because they depend on the amount of matter in the sample.

2) 

intensive properties because they do not depend on the amount of matter in the sample.

3) 

extensive properties because they depend on the amount of matter in the sample.

4) 

extensive properties because they do not depend on the amount of matter in the sample.

4) The ability of sodium chloride to dissolve in water is an example of a

1) 

chemical property.

2) 

chemical change.

3) 

physical property.

4) 

physical change.

5) What coefficients must be added to balance the following reaction?

_____ Sn + _____ H3PO4  _____ H2 + _____ Sn3(PO4)4 

1) 

3, 2, 3, 1

2) 

3, 4, 3, 1

3) 

3, 4, 4, 1

4) 

3, 4, 6, 1

6) Which of the following equations violates the law of conservation of mass?

1) 

2Al + 6HCl  2AlCl3 + 3H2

2) 

Na2C2O4 + Pb(NO3)2  PbC2O4 + 2NaNO3

3) 

AgNO3 + LiCl  AgCl + LiNO3

4) 

3Ca + 2Cr(NO3)3  3Ca(NO3)3 + 2Cr

7) According to the activity series, which of the following single replacement reactions will take place and result in a reaction?

1) 

nickel and aluminum chloride

2) 

barium and copper bromide

3) 

potassium nitrate and aluminum

4) 

sodium phosphate and zinc

8) Which of the following is not a correct chemical equation for a double displacement reaction?

1) 

2RbNO3 + BeF2  Be(NO3)2 + 2RbF

2) 

CaCl + LiCO3  CaCO3 + LiCl

3) 

Na3PO4 + 3KOH  3NaOH + K3PO4

4) 

2MgI2 + Mn(SO3)2  2MgSO3 + MnI4

9) Write the complete balanced equation for the reaction that occurs when calcium carbonate (CaCO3) reacts with lithium nitride (Li3N) in an aqueous solution.

10) Which of the following shows the balanced equation for the reaction that represents the decomposition of magnesium chlorate (Mg(ClO3)2)?

1) 

2Mg(ClO3)2  2MgCl2 + 3O2

2) 

Mg(ClO3)2  MgCl2 + 3O2

3) 

2MgCl2 + 3O2  2Mg(ClO3)2

4) 

MgCl2 + 3O2  Mg(ClO3)2