Which of these is an example of a chemical change?

Question 4 options:

fireworks exploding

grinding powder

melting cheese

ironing a shirt

A 1300-kg car initially has a velocity of 22.2 m/s due south. It brakes to a stop over a 180 m distance.

I will give brainiest to the first person to tell me who is the Carolina panther QB

Which statement accurately describes which subatomic particles are involved in nuclear and chemical reactions? A. Protons and neutrons are involved in nuclear reactions, while electrons are involved in chemical reactions. B.

At an age of 380,000 years, the temperature of the universe had fallen to 3000 k, and electrons could then combine with protons to produce hydrogen gas instead of roaming freely through space.

Oscilloscope time base problem. You are asked to display a 1 kHzsine wave signal on the screen. Since the period T is related tothe frequency f by the formula T = 1 / f, the period of this waveis 1 / (103/s) =

A bowling ball has a mass of 40kg and is kicked with a force of 10 N. What is it's acceleration

Sciencium-380 has a half-life of 3 days. If you started with a 100 gram sample, how much Sciencium-380 will remain after 9 days?

What happens to the resistance of a wire as it gets wet

How much mass is needed for a black hole?

What is one benefit of a switch in a circuit?