Common physical reactions that could be easily confused for a chemical reaction?

The nitrogen cycle in an ecosystem would stop without what

The enegry need to pump sodium outside the cell in active transport is

4HCl (g) + Si (s) ⇌ SiCl4 (l) + 2H2 (g) would be classified as a (n) :

The label on a bottle of vinegar says that the vinegar is 4% acetic acid. What would be the molarity of the acetic acid in solution

Which is one way that Earth's atmosphere supports life? It filters out oxygen It keeps Earth warm. It increases UV radiation. It provides a solid shield.

A small 15 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?

Liquid water is heated until it boils and becomes water gas. Which statement is true about the water?

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?