Which of the following represents a chemical change?

A. Bending a wire

B. Freezing of water

C. Fireworks exploding

D. Melting of a wax candle

:D

What is produced when calcium reacts with fluorine in a synthesis reaction? C+aF₂ Ca + F₂ CaF₂ CaF+2

How many grams are there in 7.5x10^23 molecules of H2SO4

Are electrons bigger than protons and neutrons

Which of the following statements is TRUE? A. State functions do not depend on the path taken to arrive at a particular state. B. Energy is neither created nor destroyed, excluding nuclear reactions. C.

How many moles of SO3 are in 2.4x10^24 molesculea of SO3

What size container do you need to hold 0.0459 mol of N2 gas at stp

What happens when two or more atoms react?

If cobalt metal is mixed with excess sulfur and heated strongly, a sulfide is produced that contains 55.06% cobalt by mass. Calculate the empirical formula of the sulfide.

Calcium's atomic number is 20. it forms ions with 18 electrons. what is the electrical charge of a calcium ion?

The doldrums region on Earth is created by an amount of heating from the Sun that results in the rising of warm, moist air, low air pressure, cloudiness, high humidity, and numerous forms of severe weather, such as thunderstorms.