Description
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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