QUESTION 26 Susan and Angelina dissolve 11 grams of potassium chloride (KCl) in

Question

QUESTION 26

Susan and Angelina dissolve 11 grams of potassium chloride (KCl) in 37. grams of water. What is the concentration of KCl in their solution using the %(m/m) method?

QUESTION 27

Veronica pours 52 kilograms of table sugar into 100 mL of coffee. Some of the sugar dissolves, but most of it does not dissolve. The coffee solution is...

…saturated with sugar.

…unsatured with sugar.

QUESTION 28

Anna dissolves 32. grams of glucose with water and the final volume of solute and solvent is 100. mL. What is the concentration of glucose in her solution using the %(m/v) method?

QUESTION 29

Amanda dissolves 0.11 moles of NaCl in 319 ml of solution. What is the concentration of NaCl in the solution using the molarity method? Remember that 1,000 mL = 1 Liter

QUESTION 30

Mellissa dissolves 26. grams of NaF with water to make a 199. mL solution. What is the molarity of the solution? There are 1,000 mL in 1 L.

QUESTION 31

What is the molar concentration (also known as the molarity) of propionic acid in a 8.3 %(m/v) propionic acid solution. The formula for propionic acid is CH3CH2COOH.

QUESTION 32

Britney and Kristy are throwing a Halloween party. Britney and Kristy make a fruit punch by mixing 465. mL of orange juice with 2.23 liters of cranberry juice. Their teacher sneaks into the party and adds 228. mL of ethanol to the punch before anyone drinks it. What is the concentration of ethanol in the punch using the %(v/v) method? Remember that there are 1,000 mL in 1 L.

QUESTION 33

Tamara has 107 g of a NaCl solution that has concentration of 4.5 % NaCl (m/m). How many grams of NaCl are dissolved in that solution?

QUESTION 34

The concentration of H3O+ in your swimming pool is 3.2 x 10-5M. What is the pH of your pool?

QUESTION 35

Claire has 1.7 Liters of 2.9 Molar solution of NaOH. What is the mass (in grams) of NaOH dissolved in the solution?

  

QUESTION 36

Calcium Chloride (CaCl2) is made of Ca2+ and 2Cl- ions. Is CaCl2 a salt?

No.

Impossible to tell.

Yes.

QUESTION 37

Which of the following is a definition of an acid?

donates OH- ions when dissolved in water

turns cloudy when dissolved in water.

releases heat when dissolved in water.

donates H+ ions when dissolved in water.

QUESTION 38

What chemicals are produced when you mix HCl(aq) and NaOH(aq)?

NaCl and water.

Nothing. There is no reaction.

Water and KCl

NaOH and water.

QUESTION 39

Which of the following is a definition of a base?

behaves as a general catalyst.

turns cloudy when dissolved in water.

donates H+ ions when dissolved in water.

accepts H+ ions from acids.

releases heat when dissolved in water.

  

QUESTION 40

What is another name for a H+ ion?

neutrino

proton

electron

positron

neutron

QUESTION 41

Look at the equation below. What is the acid on the left-hand side of the equation?

CH3COOH + H2O <=>  CH3COOH- + H3O+

None of the other answers is correct.

H2O

CH3COOH

  

QUESTION 42

What type of reaction is shown here?

MCO3 => MO + CO2

single replacement

decomposition

synthesis / combination

combustion

double replacement

QUESTION 43

What is the base on the right-hand side of the equation shown below?

C5H5N + H2O <=> C5H6N+ + OH-

C5H5N

C5H6N+

OH-

None of the other answers is correct.

H2O

QUESTION 44

You are drinking a liquid that has a pH of 8. This liquid is...

...neutral

...acidic

...basic

QUESTION 45

Amanda's swimming pool has a pH of 9.1, but it needs to have a pH of 7 to be able to swim in it. What does she need to add to her swimming pool to make the pH equal to 7?

a chemical that is basic

a chemical that is acidic

an algaecide

  

QUESTION 46

Jessica has two test tubes filled with 2 different liquids. The liquid in Tube # 1 has a pH of 5.3. The liquid in Tube # 2 has a pH of 4.3. Which tube is more acidic?

Tube # 2

Can't tell

Tube # 1

QUESTION 47

You have 2 test tubes (Tube # 1 and Tube # 2). Each tube is filled with 5 mL of a clear liquid. You measure the pH of the liquid in each tube. Both liquids have a pH of 7.1. You now add 1mL of 0.1M HCl to each tube and you measure the pH of the liquid in each tube again. Tube # 1 has a pH of 6.9. Tube # 2 has a pH of 4. Which tube most likely contained a buffer?

Tube # 1

Tube # 2

QUESTION 48

The chemical formula for sucrose (also known as table sugar) is C12H22O11. How many hydrogen atoms are in 1 molecule of sucrose?

QUESTION 49

What type of reaction is shown here?

Cu + 2AgNO3 => 2Ag + Cu(NO3)2

combustion

double replacement

synthesis / combination

decomposition

single replacement

QUESTION 50

What is the mass of 1 mole of manganese?

24.305 g

65.39g

39.098 g

54.938 g

1.0079 g

QUESTION 51

You are performing a chemical reaction in a test tube. The test tube gets warmer as the reaction takes place. This chemical reaction is...

a single replacement reaction

endothermic

a decomposition reaction.

a double replacement reaction

exothermic

QUESTION 52

The pH in your can of soda is -0.319. What is the concentration of acid (H3O+) in your can of soda?

0.48 M

-0.48 M

1.6 x 10-5 M

4.8 M

3200 M

…saturated with sugar.

…unsatured with sugar.

Explanation / Answer

26)

(m/m)% = mass of KCl * 100 / total mass of solution

= 11 * 100 / (11 + 37)

=23 %

Answer: 23 %

27)

Since some of sugar dissolves and some are left behind,

it is already saturated

For unsaturated, all solute dissolves

Answer: saturated with sugar

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