Unit Test — Unit test

Question 1

Which represents a double replacement reaction and would occur?

Revolt · Accepted Answer

Na2CO3(aq) + CaCl2(aq) 2NaCl(aq) + CaCO3(s)

Question 2

A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60.0 mL of a 0.100 M NaOH solution. The equation for the reaction is given below.HCl + NaOH NaCl + H2OWhat was the original concentration of the HCl solution?

Revolt · Accepted Answer

0.040 M

Question 3

The table shows the characteristics of four substances after they are placed in water.Substance Ion concentrationElectrical conductivity WMediumGoodXLowPoorYHighExcellentZNoneNoneWhich compound is most likely the strongest electrolyte?

Revolt · Accepted Answer

Y

Question 4

Consider the reaction below.Fe(s) + CuSO4(aq) Cu(s) + FeSO4(aq)Which reactant is a substance that is dissolved in solution?

Revolt · Accepted Answer

CuSO4

Question 5

A chemist dilutes a 1.0 mL sample of 2.0 M KNO3 by adding water to it. If the concentration of the solution that is obtained is 0.0080 M, what is its volume?Use .

Revolt · Accepted Answer

250 mL

Question 6

The molar mass of KCl is 74.55 g/mol. If 8.45 g KCl are dissolved in 0.750 L of solution, what is the molarity of the solution?Use .

Revolt · Accepted Answer

0.151 M

Question 7

The graph below shows how solubility changes with temperature.How many grams of NaCl will be needed to form 600 mL of a saturated solution at 100°C?

Revolt · Accepted Answer

240 g

Question 8

Which factor influences both solubility and the rate of dissolution?

Revolt · Accepted Answer

temperature

Question 9

Which describes the polarity in a water molecule?

Revolt · Accepted Answer

partial negative charge on the oxygen atom because it pulls electrons from the hydrogen atoms

Question 10

Which term refers to the formation of ions as a result of a chemical reaction?

Revolt · Accepted Answer

ionization

Unit Test — Unit test Answers

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