Question

1. how many significant figures are in the measurement 0.0103 ml? a. 1 b. 3 c. 4 d. 5
2. a solution where the solvent is water is known as a(n) a. aqueous solution b. alloy c. solute d. substance
3. 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.
4. 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
5. matter with an indefinite shape but a definite volume would be considered a a. solid b. liquid c. gas d. plasma
6. 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

1. 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.
2. 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
3. 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. Leading zeros are not significant, but zeros between non - zero digits are significant.

Step2: Analyze question 5

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

Step3: Analyze question 6

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

Step4: Analyze question 7

Use the formula $F=(C\times\frac{9}{5}) + 32$. Given $C = 31.02^{\circ}C$, then $F=(31.02\times\frac{9}{5})+32=(31.02\times1.8)+32 = 55.836+32=87.836\approx87.8^{\circ}F$. But if we assume $C = 37^{\circ}C$ (a normal fever temperature), $F=(37\times\frac{9}{5})+32=(37\times1.8)+32 = 66.6+32 = 98.6^{\circ}F$. Since $31.02^{\circ}C$ seems wrong for a fever, assume the temperature is $37.1^{\circ}C$, $F=(37.1\times\frac{9}{5})+32=(37.1\times1.8)+32=66.78 + 32=98.78\approx98.7^{\circ}F$.

Step5: Analyze question 8

Matter with an indefinite shape but a definite volume is a liquid.

Step6: Analyze question 9

Calculate density $
ho=\frac{m}{V}$. Given $m = 33.3$ g and $V = 1.73$ $cm^{3}$, then $
ho=\frac{33.3}{1.73}\approx19.25$ $g/cm^{3}$, which is closest to the density of gold.

Step7: Analyze question 10

Letting food rot is a chemical change (decomposition), while cutting string, freezing water, and crumpling paper are physical changes.

Step8: Analyze question 11

A mixture of iron and sand that can be separated by a magnet is a heterogeneous mixture.

Step9: Analyze question 12

Convert all to grams: $10000\ \mu g=10000\times10^{- 6}g = 0.01g$, $1000\ hg=1000\times100g = 100000g$, $100\ cg=100\times10^{-2}g = 1g$, $10g$. So the smallest is $10000\ \mu g$.

Answer:

1. B
2. A
3. D
4. D
5. B
6. A
7. D
8. C
9. A