NORTHWEST CHEM 24114 - Chemistry Quiz (3 pages)

M 1 1 1 2 Classification of Matter and Atomic View Question 1 Match each of the following to classify as a pure substance or a mixture 1 A sugar solution with sugar crystals at the bottom mixture 2 liquid water and steam at 100 degrees Celsius pure substance 3 Lead Pb Pure substance 4 a sand containing quartz silicone dioxide and calcite calcium carbonate mixture Question 2 All of the following are elements except 1 2 3 4 5 Calcium Carbonate calcite silicon Si potassium K iodide I2 magnesium Mg Question 3 Match each to the correct classification 1 Methane which burns in pure oxygen to form carbon dioxide and water compound 2 Air composed mainly of nitrogen and oxygen Homogeneous mixture 3 Platinum element 4 Freshly squeezed orange juice Heterogeneous mixture Question 4 Chunky Peanut Butter would be classified as which of the following 5 6 7 8 an element a compound homogeneous mixture heterogeneous mixture Question 5 Sucrose C12H22O11 which is commonly known as table sugar would be classified as which of the following 1 2 3 4 an element a compound homogeneous mixture heterogeneous mixture Question 6 Freshly brewed coffee would be classified as which of the following 1 2 3 4 an element a compound homogeneous mixture heterogeneous mixture Question 7 Matter can be represented at the atomic level as being composed of individual units The smallest unit is an atom that is represented by a circle and different types of atoms will be shown as different colors Units that are formed by chemically combining atoms are called molecules Looking at the figure below select the appropriate description of the contents of container A 1 2 3 4 an element a compound a mixture of compounds a mixture of elements 1 an element 2 a compound 3 a mixture of an element and a compound 4 a mixture of compounds 5 a mixture of elements Question 8 Looking at the figure below select the appropriate description of the contents of container B Question 10 Which of the following elements is not diatomic in nature 1 2 3 4 5 oxygen chlorine hydrogen nitrogen carbon M 1 5 1 6 Properties and States of Matter 1 2 3 4 an element a compound a mixture of compounds a mixture of elements Question 9 Looking at the figure below select the appropriate description of the contents of container C Question 1 All of the following represent a physical change EXCEPT 1 iron is transformed into rust in the presence of air and water 2 water is frozen 3 gasoline is evaporated 4 water is heated up 5 aluminum melts at 660 degrees celsius Question 2 Given that Intensive Properties do not depend on the amount of matter all of the following describe intensive properties of a substance EXCEPT 1 The substance has a density of 1 28 g mL 2 The substance freezes at 24 degrees Celsius 3 The substance conducts electricity 4 The sample has a mass of 3 28 g 7 Sodium metal is shiny and malleable Qualitative 8 The yellow solid melted at 128 deg C Quantitative Question 5 How would you describe the change depicted in the figure below Question 3 Indicate whether each of the following is a physical or chemical property of hydrogen gas H2 1 At room temperature it s density is less than any other gas Physical 2 It reacts violently with oxygen to form water Chemical 3 Liquefied hydrogen boils at a very low temperature 253 deg C Physical 4 Hydrogen gas does not conduct electricity Physical Question 4 In each of the following examples indicate whether the data is qualitative or quantitative 5 The density of sodium is greater than kerosene and less than water Qualitative 6 The density of copper Cu is 8 96 grams per cubic centimeter Quantitative 1 A mixture of two gaseous compounds is heated to a temperature at which one of them decomposes 2 A mixture of two gaseous elements reacts together to form two compounds one of which is a liquid 3 A mixture of two gaseous elements is cooled to a temperature at which one of the condenses transforms from a gas to a liquid 4 A mixture of two gaseous elements undergoes deposition