What are some signs that a chemical change takes place when a firework explodes? Matter is destroyed Light is produced Heat is produced The chemical composition is not changed

When methane reacts with oxygen, the products are carbon dioxide (CO2) and water (H2O). How many grams of water are formed if 24g of methane react completely with 96g of oxygen to form 66g of carbon dioxide? (include units)

Whats heptane's formula?

11. What happens to atmospheric pressure as a person rises in altitude? A. It's unaffected by changes in altitude. OB. It decreases. C. It changes based on the time of year. D. It increases.

Element A has a mass of 0.444 grams and reacts with Element B via a combination reaction. The mass of the product is 0.988 grams. The molar mass of Element A is 111 g/mol and the molar mass of Element B is 68 g/mol.

The amplitude of a wave tells you how fast the wave is moving. True False

How many protons are in an element

Which of the following is an example of oxidation? A. Charcoal is placed on a grill and lighting fluid poured over it. B. A car gets rusty over the course of a few years. C.

The metric unit of force is the A. gram. B. kilogram. C. nanometer. D. newton.

Why can endothermic reactions be spontaneous? g?

What requirements must a molecule meet in order to be considered nonpolar?