How to revise for chemistry?

Explain how two two parents with brown skin could have a child with dark brown skin and anotherchild with light brown skin

Which compound is most likely to have a sweet smell? which compound is most likely to have a sweet smell? ch3-ch2-nh2 o∥ch3-c-o-ch3 ch3-ch2-o-ch3 ch3-ch2-ch2-oh?

Which of the following is a renewable resource? coal wind oil natural gas

Although DNA evidence cannot be obtained from hair evidence without a root, which of the following can be obtained from hair evidence?

Which of the following is not a function of the circulatory system? A. Breaks down large molecules B. Delivers oxygen to body cells C. Takes carbon dioxide away from body cells D. Fights infection

The atomic mass of fluorine in 19.0 amu, so the molar mass is?

A rod shaped organism with no nucleus commonly found in Garbage will most likely belong to which kingdom

Alka-Seltzer is a solid mixture of two substances, sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7). The substances react to form water, carbon dioxide (CO2), and Na3C6H5O7.

Four properties of water are listed. 1. It is colorless and odorless in its pure form. 2. It reacts with metals to form metal hydroxide and hydrogen gas. 3. When heated to 100 °C, water evaporates. 4. It decomposes to form hydrogen and oxygen.

Water is A. Acidic B. Basic C. Neutral