Which of the following is not a phase change?

a. melting of snow

B. evaporation of water from the ocean

C. condensation of water vapor to form clouds

D. hydrogen and oxygen gas combining to form water vapor

Which of the following is always true about a synthesis reaction? a. One product is formed. b. There is only one reactant. c. The general formula is C - > A + b. d. A product might be a compound, or it might be an element.

Edith will be handing out school spirit ribbons in class on Monday. She needs 70 ribbons that are each 20 cm long - a total of 1,400 cm of ribbon - but the fabric store only sells ribbons by the meter. How many meters of ribbon does Edith need?

Will there be a precipitate for the following reaction? Aqueous zinc chloride + aqueous sodium carbonate A. No B. Yes, there will be one precipitate. C. Yes, there will be two precipitates. D. Yes, there will be three precipitates.

How many teaspoons equal one tablespoon?

Why do many gas-phase reactions occur with rapid kinetics, whereas solid-phase reactions occur slowly? a. In gas phase reactions, the reactants are more abundant and so the reaction is faster. b.

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

What variables affect the acceleration of an object and in what manner do they affect the acceleration?