Unit 1&2 Exam Review Questions Items to look for in your notes: Everything!!! 

Filtration Techniques for Mixtures Here are the five (5) types of separation: Solubility Separation of various substances by their abilities to dissolve Magnetism Separation of metallic substances by use of their magnetic property Chromatography Separation of substances that are mixed within a liquid by a special type of paper Distillation Separation of substances that are mixed within a liquid by difference in boiling point Filtration Separation of a solid from a liquid using a piece of filter paper

Before using a bunsen burner, be safe by making sure your… Hair is tied back Goggles are on

This symbol represents chemicals that are ______ hazards Fire

This symbol represents chemicals that are ___________ Highly Corrosive

Which of these would be best to measure 45 mL of water? A) B) C) B, the graduated cylinder (more gridlines = more precise measurement)

What must be on file for all chemicals in the stockroom? MSDS – material safety data sheet

Which of the following behaviors are not permitted in the chemistry lab? (answer all that are correct) writing sandals contact lenses lighting a bunsen burner running talking boots calling 911 eating using a calculator using the eyewash entering the stockroom washing hands c, e, h, and m CHEM !!

All matter has both mass and _____ volume

Which of the following units would be used to express a density. cm2 Which of the following units would be used to express a density? cm2 g/m g/mL ml/L g/mL (mass/volume)

Which state of matter has the least amount of Kinetic Energy (KE) Which state of matter has the least amount of Kinetic Energy (KE)? Solid Liquid Gas solid

Which state of matter is the easiest to compress? Solid Liquid Gas Gas (particles are the furthest apart from each other)

Which of these properties could be used to identify an unknown substance? Length density mass volume Density (an intensive physical property)

Which of these properties could be considered a chemical property Which of these properties could be considered a chemical property? length density reactivity weight volume conductivity Reactivity (describes how the substance can go through a chemical change)

Which of the following is an example of a physical change Which of the following is an example of a physical change? A) burning B) melting C) reacting with acid D) decomposing B) Melting (just spreading molecules)

Which of the following is an example of a chemical change Which of the following is an example of a chemical change? A) ice cubes freezing B) salt dissolving in water C) grinding sugar into fine powder D) iron rusting D) iron rusting

A beaker contains separate layers of sand, salt, and sugar A beaker contains separate layers of sand, salt, and sugar. The contents of the beaker are a- A) homogeneous mixture B) heterogeneous mixture C) element D) compound B) Heterogeneous mixture

Aluminum oxide is a solid composed of aluminum and oxygen atoms chemically bonded together. Aluminum oxide is a - A) homogeneous mixture B) heterogeneous mixture C) element D) compound D) compound

Pencil lead is not actually lead, but graphite Pencil lead is not actually lead, but graphite. Graphite is flat sheets of carbon atoms. Graphite can best be described as – A) a homogeneous mixture B) a heterogeneous mixture C) an element D) a compound C) an element (the element carbon)

Bleach is a solution of sodium hypochlorite dissolved in water Bleach is a solution of sodium hypochlorite dissolved in water. The sodium hypochlorite is evenly mixed throughout the water. Bleach is an example of – A) a homogeneous mixture B) a heterogeneous mixture C) an element D) a compound A) Homogeneous mixture

Sodium hypochlorite (NaClO) is the active substance in bleach Sodium hypochlorite (NaClO) is the active substance in bleach. It can be chemically separated into sodium, chlorine, and oxygen atoms. Sodium hypochlorite is an example of - A) a homogeneous mixture B) a heterogeneous mixture C) an element D) a compound D) a compound

Water and alcohol have different boiling points, so how would they be able to be separated? distillation

A mixture of sand and water could be separated using this technique filtration

Which of these numbers has the most significant figures. 8. 02 E 5 .0100204 (6 SF)

Round this number so that it has 3 significant figures: 3187.21 3190

Perform the following calculation and express your answer to the proper number of significant figures: 14 mL - 8.43 mL 6 mL

Perform the following calculation and express your answer to the proper number of significant figures: 4.784 g / 7.3 mL 6.6 e -1 0.66 g/mL

Perform the following calculation and express your answer to the proper number of significant figures: 1.24 cm x 1.29 cm x 1.17 cm 1.87 cm3

What volume in mL would you record from this beaker? 30 20 10 16 mL (or 17 mL, or 13 mL, etc.)

1.3 cm or 1.2 cm or 1.5 cm Even 1.8 cm would be an acceptable answer How long is this object? 1.3 cm or 1.2 cm or 1.5 cm Even 1.8 cm would be an acceptable answer

How long is this object? 1.45 cm or 1.43 cm or 1.48 cm 1.4 cm or 1.5 cm would not be an acceptable answer

What temperature does this thermometer read? 30.0o is correct, and so is 30.1o or 29.9o

Record mL measurements and the number of sig figs for these:

Change this number to scientific notation: .0006015 g 6.015 x 10-4 g

Convert 12.5 g into ounces (1 ounce = 28.35 g)

Perform the following calculation and express your answer to the proper number of significant figures: 2.18 X 10-5 g / 8.0 X 10-8 cm3 2.7 X 102 g/cm3 or 270 g/cm3

Convert the previous answer into the following unit: kg/m3 Convert g to kg; 1000g = 1kg Convert cm3 to m3 ; 100cm = 1m You must convert cm to m three times in order to get m3 270,000 kg/m3 or 2.7 X 105 kg/m3

You place a marble on a scale and measure its mass to be 8. 450 g You place a marble on a scale and measure its mass to be 8.450 g. You fill a graduated cylinder and measure its volume to be 34.5 mL. After placing the marble in the cylinder, the water level rises to 39.7 mL. Calculate the density of the marble. Subtract the initial volume from the final volume to get the volume of the marble (5.2; 2 SF due to the addition subtraction rule)) Divide mass by volume to get density Answer: 1.6 g/mL (2 SF due to the multiplication rule)