Chemistry Quiz #1 Review

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1 Name: Chemistry Quiz 1 Review Page 1 of 6 Date: Please check your answers at Chemistry Quiz #1 Review Part A: Density Calculations 1. The density of sodium is 0.97 g/cm 3. A sample of sodium has a mass of g. What is the volume of the sample of sodium? Round your answer to two decimal places if necessary. d = 0.97 g/cm 3 m = g v = v = cm 3 Therefore the volume of the sodium sample is cm The density of copper is 8.94 g/cm 3. A sample of copper has a mass of 13 g. What is the volume of the sample of copper? Round your answer to two decimal places if necessary. d = 8.94 g/cm 3 m = 13 g v = v = 1.45 cm 3 Therefore the volume of the copper sample is 1.45 cm A sample of lead has a volume of 5 cm 3. The density of lead is g/cm 3. What is the mass of the sample? Round your answer to two decimal places if necessary. d = g/cm 3 m =? v = 5 cm 3 m = v x d m = 5 x m = 56.7 g Therefore the mass of the lead sample is 56.7 g.

2 Part A: Density Calculations Continued Chemistry Quiz 1 Review Page 2 of 6 4. A sample of silicon has a volume of 3.5 cm 3. The density of silicon is 2.33 g/cm 3. What is the mass of the sample? Round your answer to two decimal places if necessary. d = 2.33 g/cm 3 m =? v = 3.5 cm 3 m = v x d m = 3.5 x 2.33 m = 8.16 g Therefore the mass of the lead sample is 8.16 g. 5. A sample of a metal has a volume of 2 cm 3 and a mass of 38.7 g. What is the density and identity of the metal? Round your answer to two decimal places if necessary. Tungsten = g/cm 3 Uranium = 20.2 g/cm 3 Platinum = g/cm 3 d =? m = 38.7 g v = 2 cm 3 d = m v d = d = g/cm 3 (Include final density and identity of the metal) Therefore the density of the metal is g/ /cm 3, making the identity of the metal tungsten. 6. A ring is thought to be platinum. The mass of the ring is 8 g, and the volume of the ring is 0.5 cm 3. What is the density of the ring? If the density of platinum is g/cm 3, is the ring platinum? Round your answer to two decimal places if necessary. d =? m = 8 g v = 0.5 cm 3 d = m v d = d = 16 g/cm 3 (Include final density and identity of the metal) Therefore the density of the metal is 16 g/cm 3. This means that the metal can t be platinum, because the density of platinum is always g/cm 3.

3 Part A: Density Calculations Continued Chemistry Quiz 1 Review Page 3 of 6 7. A block of mystery metal is sitting in the lab. The block measures 2 cm by 2 cm by 4 cm, and weighs g. What is the density and identity of the mystery metal? Round your answer to two decimal places if necessary. Zinc = 7.13 g/cm 3 Aluminum = 2.7 g/cm 3 Nickel = 8.9 g/cm 3 Volume Calculation 2 cm x 2 cm x 4 cm = 16 cm 3 m = g v = 16 cm 3 d =? d = m v d = d = 8.9 g/cm 3 (Include final density and identity of the metal) Therefore the density of the metal is 8.9 g/cm 3, and the identity of the metal is nickel. 8. A sample of zinc has a density of 7.13 g/cm 3 and a mass of 3 kg. What is the volume of the sample? Note that 1 kg = 1000 g. Round your answer to two decimal places if necessary. Conversion 3 kg x 1000 g 1 1 kg = 3000 g m = 3000 g d = 7.13 g/cm 3 v = v = cm 3 Therefore the volume of the zinc sample is cm A sample of iron has a density of 7.87 g/cm 3 and a mass of 30 mg. What is the volume of the sample? Note that 1 g = 1000 mg. Round your answer to two decimal places if necessary. Conversion 30 mg 1 1 g x 1000 mg = 0.03 g m = 0.03 g d = 7.87 g/cm 3 v = v = cm 3 Therefore the volume of the iron sample is cm 3.

4 Chemistry Quiz 1 Review Page 4 of 6 Part B: Classification of Matter 1. Indicate the description that applies to the diagram. A single circle represents an atom, while joined circles represent molecules. The first example is done for you. Only one type of molecule, but each molecule is a combination of two different atoms Molecules mixed with atoms, different atoms are present Two different atoms Two different molecules Even though the atoms are linked, it is still just one type of atom Only one type of molecule Only one type of molecule Two different types of molecule

5 Part C: Physical & Chemical Properties 1. Describe the physical properties for each of the objects given below. Chemistry Quiz 1 Review Page 5 of 6 Object Opacity Luster Texture Mirror Opaque Shiny Smooth Quartz Crystal Translucent Slightly Shiny (you can t see your reflection like in a mirror) Smooth in places, overall is rough Opaque Low, dull, although more moist areas are slightly shiny Sticky, powdery Mushroom 2. Indicate if each is a physical or chemical property. Property Physical or Chemical Lithium reacts with water reacts means to form a new substance Physical or Chemical Water is transparent Substances are not mixed, a single substance (water) is being observed Physical or Chemical Magnesium reacts with acid reacts means to form a new substance Physical or Chemical The melting point of ice is 0 o C Substances are not mixed, a single substance (water) is being observed Physical or Chemical Iron rusts A new substance, rust, is being formed Physical or Chemical 3. Indicate and describe the property of metals that is being shown in each picture. Ductility: The ability of metals to be pulled into wire Malleability: The ability of wire to be flattened into sheets

6 Part C: Physical & Chemical Changes 1. How can you determine if a chemical change has occurred? Several observations tell us if a chemical change has occurred, including: Formation of a precipitate, production of light, change or creation of color, formation of bubbles without stirring or heating (this means a gas has been formed), having the mixture turn hot or cold without refrigeration or heating. Chemistry Quiz 1 Review Page 6 of 6 2. Indicate if the examples below are physical or chemical changes, and explain your choice. Example Reason Melting ice Two substances are not being mixed, one substance is merely being heated. Mixing vinegar and baking soda Separating salt and pepper using static electricity Mixing powdered juice and water Two clear liquids are mixed, resulting in a red liquid Formation of a gas (bubbles) without heating or stirring. Bonds are not broken, two substances are being separated but they retain their identities. The powder becomes distributed in the water, but it remains powder, and the water remains water. A new color appears where that color has not been before. Two clear liquids are mixed, resulting in a blue powder Production of a precipitate (the blue powder). Boiling water A single substance is heated, there is no mixture of substances. A glow stick that releases light when activated Light is released from the chemicals mixing. A pack that turns cold when activated Temperature change (cold) without outside cooling.

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