Which statement describes evidence of a chemical reaction?

a. ice melting

b. water boiling

c. lighting a match

d. grape juice freezing

Because Kevin is so strong, he is able to move the crate in 10 seconds. How much power, in watts, does he use?

A chemical reaction takes place among 3 molecular ions that have each lost 2 electrons, 2 molecular ions that have each gained 3 electrons, and 1 molecular ion that has gained 2 electrons.

When determining the specific heat from a given metal in a calorimeter the mass of the water remains constant, but the mass of the metal is increased what would happen to the equilibrium temperature

Which Kelvin temperature is equivalent to - 24°C? (1) 226 K (3) 273 K (2) 249 K (4) 297 K

How co you find anhydrides?

If the half-life of hydrogen-3 is 11.8 years, after two half-lives the radioactivity of a sample will be reduced to one-half of the original amount. If the half-life of hydrogen-3 is 11.

If element X has 25 protons, how many electrons does it have?

How much work is done to raise a 20N box 4m?

Which of the following lists the types of single substances? (Select only one answer) Group of answer choices elements and mixtures suspensions, solutions, and colloids elements, compounds, and mixtures elements and compounds

What is the average mass of a single silicon atom in grams?