What is the charge on the barium ion

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What is the charge on the barium ion

1.    What is the charge on the barium ion? 1- 2+ 1+ 2- none of the above

2.    When rounding the number 2.348615 to 3 significant figures, what is the correct value?

2.35

2.350

2.34

2.36

none of the above

3.    How many electrons would be in a -2 charged anion of sulfur?

2

16

36

18

none of the above

4.    Which of the following items is a pure substance?

ice

brass

seawater

air

none of the above

5.    What is the difference between a physical change and a chemical change?

A chemical change is one that does not alter the chemical composition of a compound. A physical change, however, will alter the chemical composition of a compound.

A physical change is one that does not alter the chemical composition of a compound. A chemical change, however, will alter the chemical composition of a compound.

6.    How many protons and electrons are present in O2−2−?

8 protons and 8 electrons

10 protons and 8 electrons

16 protons and 8 electrons

8 protons and 10 electrons

none of the above

7.    Which of the following elements has an atomic number of 4?

He

H

Be

C

none of the above

8.    Convert 2693 mgmg to kgkg.

0.02693 kgkg

3.304×10−43.304×10−4 kgkg

2.693 kgkg

2.693×10−32.693×10−3 kg

9.    What is heat capacity?

Heat capacity is a measure of how much heat is needed to raise the temperature of a given substance by 1 ∘C∘C.

Heat capacity is the capacity to do work or generate heat.

10. How many significant figures should be reported in the answer to the following calculation?

(2.003) ×× (1.70) =

1

2

4

3

none of the above

11. What is the volume of 12.8 g of a liquid that has a density of 0.789 g/mL?

10.7 mL

16.2 mL

13.6 mL

12.8 mL

none of the above

12. When 49.5 J of heat was transferred to 7.3 g iron at 22∘∘C, the temperature of iron increases to 37∘∘C. What is the specific heat of iron in J/g⋅⋅∘∘C?

24

2.2

0.45

4.5

none of the above

13. How many significant figures are in the number 2530.3?

4

3

6

5

none of the above

14. Which of the following statements is FALSE?

A pure substance may either be an element or a compound.

A mixture may be either homogeneous or heterogeneous.

Mixtures may be composed of two or more elements, two or more compounds, or a combination of both.

Matter may be a pure substance, or it may be a mixture.

All of the above statements are true.

15. How many inches are in 6.32 cm?

3.78

2.49

16.1

8.86

none of the above

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