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Name: ______Date: ______
Unit 1 Worksheet 1
- Explain the difference between an element and a compound.
A compound can be separated into an element by chemical means only. An element is the simplest form of matter under normal laboratory conditions.
- Write the correct name or symbol for each of the following:
- Aluminum Al
- Nitrogen N
- Copper Cu
d. O oxygen
- C carbon
- S sulfur
- State whether each of the following is a homogeneous or heterogeneous mixture.
a. Oxygen dissolved in water Homogeneous
- Carbon mixed with sand Heterogeneous
- Apple juice Homogeneous
- Vegetable soup Heterogeneous
- Sour milk Heterogeneous
- Rewrite measurements in scientific notation.
a. 0.000758 7.58 x 10-4
- 4573217 4.573217 x 106
- 0.03438 3.438 x 10-2
- Identify the number of significant figures in each measurement.
a. 0.42 L 2
- 78.00 m 4
- 320 g 2
- Perform the following operations and give the answers in standard exponential form with the correct number of significant figures.
- 37.2 mL + 18.0 mL + 380 mL = 4.35 x 102 mL
- 0.57 cm x 0.86 cm x 17.1 cm = 8.4 x 100 cm3
- (8.13 x 104) ¸ (3.8 x 102) = 2.1 x 102
d. 71.3 kg + 0.08 kg = 7.14 x 10 kg
- A rock has a mass of 127 g and displaces 32.1 mL of water. What is the density of the rock?
127 grams / 32.1 mL = 3.96 g/mL
- Make the following conversions.
- 384 mg to grams 0.384 g
- 125 g to kilograms 0.125 kg
- 5 x 103 mm to meters 5 m
- 0.12 L to mL 120 mL
- 13.5 km to meters 13,500 m
- A chemist experimentally determined the boiling point of an unknown liquid as 124.1°C. Her boss said the actual boiling point of the liquid is 125.7°C. Calculate the percent error.
1.3 %
- A 2.00 kgram sample of bituminous coal is composed of 1.30 kg carbon, 0.20 kg of ash, 0.15 kg of moisture, and 0.35kg of volatile (gas forming) material. How many kilograms of carbon are in 125 kg of this coal?
81.3 kg
- What is the mass in kilograms of 14.0 liters of gasoline? The density of gasoline is approximately 0.680 g/cm3.
9.52 kg