# Question 1 Given is the mass of 4 sugar packages with the following masses: 2.54

Question 1

Given is the mass of 4 sugar packages with the following masses:

2.541g

2.650g

2.100g

2.579g

What is the average mass of the sugar packages?

Group of answer choices

2.4675 g

9.870 g

2.480 g

2.278 g

2.47 g

3.29 g Question 2

4 students determine the density of 4 pieces of copper metal by water displacement method. Below are their their mass and volume measurements and the calculated density.

Student mass volume calculated density

A 82.48 g 10.12 mL 8.15 g/mL

B 70.15 g 7.56 mL 9.28 g/mL

C 60.57 g 6.29 mL 9.63 g/mL

D 85.47 g 9.69 mL 8.82 g/ml

Average density 8.97 g/mL

Given that the theoretical density of copper is 8.96 g/mL, how would you describe the result in terms of accuracy and precision?

Group of answer choices

The density results are not accurate but precise

The density results are accurate but not precise

The density results are neither accurate nor precise

The density results are both accurate and precise Question 3

An instructor asks you to measure out 10.0 mL of a liquid. Which of the following glassware would work best?

5 types of classware: A) Erlenmeyer, B Graduated Cylinder, C) Pipet, D) beaker, E) Buret

Group of answer choices

Buret and Pipet

Buret and Beaker

Graduated Cylinder and Pipet

Erlenmeyer and Beaker

Erlenmeyer and Graduated Cylinder

Graduated cylinder and buret Question 4

The graph below shows the solubility of certain compounds in water and the change of solubility with temperature.

Soubility of select ionic compounds in g of salt in 100g of H2O versus temperature in C from 0 to 100C.

What is the solubility of KCl at 60 C? 30 g/100 mL 58 g/100 mL 47 g/100 mL 39 g/100 mL 25 g/100mL

What has the highest solubility at 0C? KNO3 CaCI2 NaNO3 NaCI

What has the highest solubility at 27C? KNO3

CaCI2

NaNO3

NaCI

Question 5

Take a look at the follow graph.

Describe the general effect on the solubility of ionic compounds with increasing of temperature.