Answer:
B.) If sodium carbonate is added to vinegar, the reaction will absorb heat.
Explanation:
A.) is incorrect because this is not testable. Rather, it is just an opinion that cannot be proven correct or incorrect.
B.) is correct because this statement is testable. Tests need to be run to determine the accuracy of the statement.
C.) is incorrect because this statement explains something that does not need to be tested. It is an example of a physical change when one tears a piece of paper.
D.) is incorrect because this is already a true statement. It is obvious that not all reactions absorb/release heat. While tests could be run to further prove this statement true, it is already considered accurate.
Answer:
Two policies that would most likely reduce gasoline use includes;
(1) Reduction in driving of vehicles such as having a bike sharing plan and
(2) Promoting only fuel efficient cars in the city such as electric cars
Explanation:
Policies that would decrease a city's gasoline usage includes
(1) Reduction in driving of vehicles such as having a bike sharing plan
(2) Limit on road worthiness of cars and restrictions on less fuel efficient habits
(3) Promoting only fuel efficient cars in the city such as electric cars
(4) Requirement to switch of vehicles when not moving
(5) Promoting optimal home deliveries
(6) Limiting other power devices to only fuel efficient models.
The answer to this question will be Uranium
We take activities of Solids and liquids equal 1. The reason is there concentrations not at all change amount of reactant at equilibrium in the reaction. Hence we don't consider concentrations of pure solids and liquids while writing equilibrium constant.
So for above reaction, equilibrium constant (K) = [Sn^2 +] ^3 x 1 / [Fe^3+]^2 x 1. Ping me if you have any doubts.
