Science Concepts Review

Use the diagram below to answer the following, According to the law of conservation of mass, how much Zinc (Zn) is present in the product?

• A. 40 g
• B. 88 g
• C. 104 g
• D. 256 g

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Which method of heat transfer is the transfer of heat through a liquid or gas?

• conduction.
• convection.
• insulation.
• radiation.

When the roller coaster is the position 1, top of the first hill, which form of energy is greatest?

• Kinetic
• Transform
• Potential

To increase the total amount of kinetic energy an object has I can change what two variables?

• position and mass
• speed and position
• speed and surface area
• speed and mass

When Calcium Chloride and Baking soda combine, the starting temperature of the reactants is 22°C. At the end of the reaction the temperature increases to 25°C. Identify this as an endothermic or exothermic reaction.

• Endothermic
• Exothermic

If two carbon (2C) atoms combine with two oxygen (2O) atoms to form new molecules how many of each atom will be found in the product? 2C + 2O ----> ?

• A. one carbon and two oxygen
• B. two carbon and three oxygen
• C. three carbon and four oxygen
• D. two carbon and two oxygen

Two different chemical reactions take place in two separate test tubes. The results of the reactions on the test tubes are shown below. What can be concluded about the two reactions?

• Reaction in test tube A is exothermic while that in test tube B is endothermic.
• Reaction in test tube A is endothermic while that in test tube B is exothermic.
• Both reactions are exothermic.
• Both reactions are endothermic.

• A.the same
• B.different

• A.identical
• B.different