Which of the following is a chemical reaction?

1-Painting a wall blue

2-A bicycle rusting

3-Ice cream melting

4-Making a sand castle

Suppose a 20 gram cube of aluminum were cut into four equal parts. How would the density of one part be related to the density of the whole cube?

What is the relationship between altitude and temperature in the exosphere?

How does energy change?

Combustion is defined as a reaction between a fuel and oxygen producing what

How are ocean waves different from sound waves?

Enter a balanced chemical equation for the combustion of gaseous methanol.

Being able to identify good source of scientific information and apply the knowledge to problems in your life is a part of having A Scientific hypothesis B Scientific inquiry C Scientific literacy D Scientific laws

Hexane and heptane are miscible with each other in all proportions. In making a solution of them, is the entropy of the system increased, decreased, or close to zero, compared to the separate pure liquids? a. The entropy of the system is increased.

Determine the hydronium ion concentration in a solution that is 0.00014 M HCl. Answer in units of M.

Which element in period 2 has the most mass