Question

1. how many significant figures are in the measurement 0.0103 ml? a. 1 b. 2 c. 3 d. 5 5. a solution where the solvent is water is known as a(n) a. aqueous solution b. alloy c. solute d. substance 6. a property of matter that depends on the amount of matter present would be considered a(n) a. physical b. chemical c. intensive d. extensive property. 7. micah tells his mom he cant go to school today to take his chemistry test because he is running a temperature of 310.2 k. what is his temperature in degrees fahrenheit? a. -11.4°f b. 2.81°f c. 37.1°f d. 98.7°f 8. matter with an indefinite shape but a definite volume would be considered a a. solid b. liquid c. gas d. plasma 9. using the data table to the right, determine the identity of a cube of metal that has a volume of 1.73 cm³ and a mass of 33.3 grams. a. gold b. nickel c. silver d. zinc name of metal melting point (°c) density (g/cm³) zinc 419.53 7.134 nickel 1,455 8.912 copper 1,084.62 8.96 silver 961.78 10.501 gold 1,064.18 19.282 10. which of the following is not an example of a physical change? a. cutting a piece of string in half. b. freezing water into an ice - cube. c. crumpling a piece of paper into a ball d. letting the food in your lunch box rot in your locker. 11. you are given a container filled with clumps of iron and sand. you can separate the iron from the sand using a magnet. this makes this a a. homogeneous mixture b. compound c. heterogeneous mixture d. solution 12. which of the following measurements would be considered the smallest? a. 10,000 μg b. 1,000 hg c. 100 cg d. 10 g

Explanation:

Step1: Analyze question 4

The number 0.0103 has 3 significant figures. The leading zeros are not significant, but the 1 and the two non - zero digits after it are. So the answer is B.

Step2: Analyze question 5

A solution where the solvent is water is known as an aqueous solution. So the answer is A.

Step3: Analyze question 6

A property of matter that depends on the amount of matter present is an extensive property. So the answer is D.

Step4: Analyze question 7

Use the formula $F=\frac{9}{5}(K - 273.15)+32$. Substitute $K = 310.2$. First, $310.2-273.15 = 37.05$. Then $\frac{9}{5}\times37.05=66.69$. And $66.69 + 32=98.69\approx98.7^{\circ}F$. So the answer is D.

Step5: Analyze question 8

Matter with an indefinite shape but a definite volume is a liquid. So the answer is B.

Step6: Analyze question 9

Calculate the density using $
ho=\frac{m}{V}$. Here, $m = 33.3$ g and $V = 1.73$ cm³. $
ho=\frac{33.3}{1.73}\approx19.25$ g/cm³. This density is closest to gold. So the answer is A.

Step7: Analyze question 10

Letting food rot is a chemical change. Cutting a string, freezing water, and crumpling paper are physical changes. So the answer is D.

Step8: Analyze question 11

A mixture of iron and sand that can be separated with a magnet is a heterogeneous mixture. So the answer is C.

Step9: Analyze question 12

Convert all to grams. A: $10000\ \mu g=10000\times10^{- 6}\ g = 0.01\ g$. B: $1000\ hg=1000\times100\ g = 100000\ g$. C: $100\ cg=100\times10^{-2}\ g = 1\ g$. D: $10\ g$. The smallest is A.

Answer:

1. B. 3
2. A. aqueous solution
3. D. extensive
4. D. 98.7°F
5. B. liquid
6. A. Gold
7. D. Letting the food in your lunch box rot in your locker.
8. C. heterogeneous mixture
9. A. 10,000 μg