A gaseous hydrocarbon called ethylene is converted into a tough and flexible solid. This is an example of a physical change nuclear change chemical change 0.5 points QUESTION 2 In rough weather water flow picks up materials from the shoreline and bottom of the river. This generally will result in the formation of a solution colloid suspension 0.5 points QUESTION 3 Which of the following is the best reason why chemistry is often referred to as the central science? Chemical concepts and the language of chemistry are important in the study of many other branches of science and technology. This is due to the fact that chemistry utilizes the scientific method. Chemistry is more important than other sciences like physics and biology. Because only chemistry truly studies the natural world. 0.5 points QUESTION 4 In three beakers there are three unique mixtures. Beaker A contains a mixture of sand in water. Beaker B contains a mixture of egg white proteins (very large molecules) in water uniformly mixed. Beaker C contains a sugar in water mixture uniformly mixed. Which of the mixtures is visually uniform and most likely to exhibit the Tyndall effect? Beaker A Beaker B Beaker C 0.5 points QUESTION 5 When making a solution, the container gets hot. This is an example of an endothermic process exothermic process 0.5 points QUESTION 6 Which of the following is most likely an example of a basic research project? Potential development of a completely new family of chemicals in 10 to 15 years. The development of better packaging of batteries for electric cars. Modification of an existing chemical reaction process to make the same chemical in a less expensive fashion. Finding a technically more efficient method to produce the same product. 0.5 points QUESTION 7 When particles that make up a type of matter are in rigid fixed positions with respect to each other are given sufficient energy to begin to move with respect to each other but remain very close together, the process is evaporation, a physical process evaporation, a chemical process melting, a chemical process melting, a physical process 0.5 points QUESTION 8 In three beakers there are three unique mixtures. Beaker A contains a mixture of sand in water. Beaker B contains a mixture of egg white proteins (very large molecules) in water uniformly mixed. Beaker C contains a sugar in water mixture uniformly mixed. Arrange the beakers in order of increasing particle size dispersed in water. Beaker A < Beaker B < Beaker C Beaker C < Beaker B < Beaker A Beaker B < Beaker A < Beaker C Beaker B < Beaker C < Beaker A 0.5 points QUESTION 9 The Kinetic Molecular Theory has been employed as an explanation for the physical behavior of solids, liquids and gases for a long period of time. Which of the following might happen to this theory if further experimentation lead to reproducible results that could not be explained using this theory/model? Choose all that apply. The theory could be discarded if the results of the new experiments totally contradicted the premises of this theory. The new evidence would be ignored because the theory has been supported by evidence based on reproducible experiments for years. The theory might be modified to fit the new evidence. 0.5 points QUESTION 10 Which of the following represents an example or are examples of science? a. The investigation of the characteristic properties of a newly discovered element. b. The discovery of a new and unique plastic polymer through research. c. The development of a less expensive method to produce a known material. d. Both a and b are examples 0.5 points QUESTION 11 Given the formula, Ca3(PO4)2, how many atoms of phosphorus are represented? Three atoms of phosphorus two atoms of phosphorus one atom of phosphorus 8 atoms of phosphorus 0.5 points QUESTION 12 The fat in whipped cream remains as groupings of fat molecules evenly distributed throughout the other materials, one of which is water. These groupings do not tend to settle on standing. colloid suspension solution QUESTION 14 The complete dissolving of a solid fertilizer in water prior applying it to plants is the formation of suspension colloid solution 0.5 points QUESTION 15 The original Back to the Future movie showed a box of plutonium marked with a radioactive symbol in under Doc Browns bed. He used this fissionable material to create the 1.21 gigawatts needed to make his car travel through time. The energy that the car ran on was generated by A compound undergoing a chemical change An element undergoing a nuclear change A compound undergoing a nuclear change An element undergoing a chemical change 0.5 points QUESTION 16 In 400 BC, the proposal that all matter was made up of tiny particles called atoms was an example of a(n) hypothesis theory experiment data set 0.5 points QUESTION 17 In the instant cold packs there is a small plastic bag or tube containing a compound known as ammonium nitrate. That small plastic bag or tube is inside a bigger bag filled with water. When you hit the cold pack, it breaks the tube so that the ammonium nitrate mixes with the water to create a mixture and gets cold. This process is a physical process and endothermic a chemical process and endothermic a physical process and exothermic a chemical process and exothermic 0.5 points QUESTION 18 Which of the following are examples that would involve the use of models in chemistry? a. a picture of the internal structure of an atom b. a Lewis structure which shows the connectivity between atoms in a molecule c. a look at the internal arrangement of the particles in the various states of matter d. a, b & c are all examples of the use of models 0.5 points QUESTION 19 Which of the following correctly distinguishes between the three primary states of matter? A gas is not compressible whereas a liquid is easily compressed. A liquid has particles close together but the particles can migrate with respect to each other whereas a solid has the particles close together but the particles are held in rigid, fixed positions with respect to each other. A solid occupies a constant volume and has a constant shape, whereas both liquids and gases have constant volume and will take on the shape of their container. A liquid will flow but a gas will not flow.