Lime, CaO, is produced by the reaction CaCO3(s) ? CaO(s) + CO2(g). What weight of CaO is obtained by the decomposition of 38.7 g of CaCO3?
A) 15.5 g
B) 17.0 g
C) 21.7 g
D) 23.2 g
C
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If it takes energy to break bonds and you gain energy in the formation of bonds, how can some reactions be exothermic, while others are endothermic?
A. Some products have more energy than others and they always require energy to be formed. B. It is the total amount of energy that matters. Sometimes some bonds are stronger than others and so you gain or lose energy when you form them. C. It is the total number of bonds that matters. Sometimes you create more bonds than you break and since all bonds have same amount of energy you gain or lose energy depending on the number of bonds. D. Some reactants have more energetic bonds than others and they will always release energy. E. none of the above
Chemical fertilizers are used in agriculture because they provide greater amounts of nutrients and organic matter than are found in the natural soil.
Answer the following statement true (T) or false (F)
Which of the following countries has the lowest population growth rate?
A. China B. India C. Brazil D. Russia
At constant temperature the pressure on a 6.0 L sample of a gas is reduced from 2.0 atm to 1.0 atm. What is the new volume of the gas sample?
A) 0.083 L B) 0.33 L C) 3.0 L D) 12 L