Exploring Creation Chemistry Module #5 Test
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01. Classify the following reaction as formation, decomposition, combustion, or none of these:
2H
2
CO
3
(aq) ---> 2C(s) + 3O
2
(g) + 2H
2
(g)
02. Classify the following reaction as formation, decomposition, combustion, or none of these:
2AgCl(aq) + Ca(s) ---> CaCl
2
(aq) + 2Ag(s)
03. Classify the following reaction as formation, decomposition, combustion, or none of these:
2C
2
H
2
+ 5O
2
---> 4CO
2
+ 2H
2
O
04. Classify the following reaction as formation, decomposition, combustion, or none of these:
Br
2
(g) + C(s) + H
2
(g) ---> CH
2
Br2(l)
05. Write the chemical equation for the formation of PH
2
Br.
06. Write the chemical equation for the decomposition of Na
2
CrO
4
.
07. Write the chemical equation for the combustion of liquid C
10
H
22
. Include phase symbols in your answer.
08. What is the mass of a Pr atom, in kg?
09. What is the mass of a HClO
4
molecule in amu?
10. How many moles are in 34.5 g of NaBrO
3
?
11. If a chemist has 12.3 moles of N
2
H
4
O
3
, what is the mass of the sample?
12. If a chemist has 0.45 moles of K
2
CO
3
and causes it to decompose into its constituent elements, how many moles of oxygen will form?
13. Which sample has more atoms in it: 150.0 g of gold (Au), or 10.0 g of lithium?
14. If a fireplace or furnace has poor airflow, what should you be concerned about?
15. A chemist has one mole of an unknown molecule. The mass of this sample is 111.1 grams. After doing some tests, the chemist determines that the molecule has 2 chlorine atoms in it and one other atom she cannot identify. In other words, the molecule's formula is XCl
2
, where X is unknown. Based on the mass of the sample, what is atom X?