At which of the following angles will the sunlight received at a location on Earth fall over the smallest area?

80°

659

40°

10°

Why does surface area of a reactant influence the rate of the reaction?

Where do convaection currents take place

True or False: The identity of a pure substance will change when it is melted or frozen.

Would the amount of dissolved oxygen in the Missouri River increase or decrease if large amounts of chemical waste were dumped into it? Remember that chemical wastes feed microorganisms

Example of ammonium salt

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