What only happens during a chemical reaction?

A.

Colors change.

B.

New substances are formed.

C.

Bubbles form.

D.

A solution is made.

Explain how you would calculate the q for warming 100.0 grams of liquid water from 0°C to 100 °C.

A sample of gas contains 6.25 * 10-3 mol in a 500.0 mL flask at 265°C. What is the pressure of the gas in kilopascals? Which variables are given?

Which of these statements about alloys and intermetallic compounds is false? Which of these statements about alloys and intermetallic compounds is false?

What type of mixture will not allow light to pass through?

Calculate the cell potential for the galvanic cell in which the reaction Fe (s) + Au 3 + (aq) - ⇀ ↽ - Fe 3 + (aq) + Au (s) occurs at 25 ∘ C, given that [ Fe 3 + ] = 0.00150 M and [ Au 3 + ] = 0.797 M.

The mass of a solid copper penny is 3.46 g. how many copper atoms are in the penny?

Consider a situation in which 211 g g of P4 P 4 are exposed to 240 g g of O2 O 2 . What is the maximum amount in moles of P2O5 P 2 O 5 that can theoretically be made from 211 g g of P4 P 4 and excess oxygen?

What is the total pressure when 0.400 g of H2, 2.00 g of N2, and 10.5 g of CO2 are injected into a 10.0 liter flask at 273 K?

The balanced chemical equation for the combustion of methane is: CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (g) Which of the following statements concerning this chemical equation is/are correct? 1.

In one kind of nuclear reaction, two nuclei fuse, or join together, to form a larger nucleus. This kind of reaction happens only at very high pressures. Explain why such high pressures are necessary to cause these reactions to occur.