Answer:
B
Explanation:
Not sure, but that one makes the most since
Gravity. The rock is being pushed down and you are counteracting that force with a crowbar pushing it upward.
Answer:
(A) N4H6 (B) H2O (C) LiH (D) C12H26
Explanation:
The given compounds have been arranged from left to right in order of increasing percentage by mass of hydrogen.
The percent by mass of hydrogen can be calculated by mass of hydrogen in that compound divided by total mass of that compound and finally multiplying the result with 100 to obtain the required percentage.
Answer:
D
Explanation:
the production of an odor would indicate that the heat ignited a chemical reaction