Standard 1 Objective 4 Part 2 Question Preview (ID: 2906)
Identify The Observable Features Of Chemical Reactions.
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A student uses clay to model the conservation of mass. 1st she finds the mass of the clay on a balance. Then she makes shapes with the clay without adding or removing clay. She masses it again. How will her results model this law?
a) They will show that the shape has changed but the mass is the same
b) They will show that the larger the shape, the greater the mass
c) They will show the changing shape has changed the mass of the clay
d) They will show that the shape has changed and the mass has also
Students measure 2.0g of baking soda and 5.0g of vinegar. They mix them together and watch bubbles form. The mass of the resulting liquid is 6.7g. Based on the law of conservation of mass, what should the mass of the gas that escaped be?
a) .3 g
b) 6.7g
c) .7g
d) .5g
Students measure 2.0g of baking soda and 5.0g of vinegar. They mix them together and watch bubbles form. The mass of the resulting liquid is 6.7g. How should students redesign this experiment for better accuracy?
a) Use more baking soda and less vinegar
b) Trap the escaping gasses
c) Use different substances so that the reaction will be slower
d) Be more precise in the use of the triple beam balance
Refer to chart 1. Which test should be considered the control?
a) 1
b) 2
c) 3
d) 4
Refer to chart 1. Which variable was changed in test # 2?
a) The amount of baking soda
b) The amount of vinegar
c) The temperature of the vinegar
d) The amount of gas produced
What should the students conclude about changing the amounts of reactants?
a) Changes the speed of the reaction
b) Does not change the speed of the reaction
c) Might change the speed of the reaction
d) Changes the types of products formed
What should the students conclude from the #4 test?
a) Changing the temperature increased the speed of this reaction
b) Changing the amount of reactants increased the speed of this reaction
c) Changing the temperature and amounts of reactants decreased the speed
d) Changing the temperature has no effect on most chemical reactions
Refer to chart 2. How has the development of computers depended on chemists?
a) They wrote the software to run the computer programs
b) They developed the materials in the chips, wiring and case
c) They developed chemical formulas to tell the computer what to do next
d) They built the first computers and created the market for them
Refer to chart 2. How have chemical fertilizers, insecticides and herbicides made our standard of living higher?
a) They have increased the amount and quality of the food we eat
b) They have improved the way the goods and materials are shipped
c) They provide the chemicals needed to cook and process foods
d) They are bringing new types of species into our food supply
Refer to chart 2. Which of the following would be the best title for this reading?
a) Chemistry solves the problems of modern life
b) Chemistry affects our daily lives
c) Chemists find new ways to fertilize crops
d) Nylon found in chemical supply cabinet
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