Which statement is true about the particles of a solid when the solid

changes into a liquid?

1) They stop vibrating.

2) Their kinetic energy increases.

3) They move closer to each other.

4) The attractive force between them increases.

One carbon (c) and one ozone (O3) react to form one carbon monoxide (CO) and one oxygen gas (O2) particle. How many ozone particles are needed to get 24 particles of oxygen gas (O2) ?

A lawnmower runs on gasoline. what type of energy transformation takes place in its engine?

4. A compact disc has a diameter of 11.8 cm. What is the surface area of the disc in square centimeters? In square meters? [Area of a circle = (π) (radius) 2 ]

In a redox reaction, why does an element's oxidation number increase

3. A student was given an unknown metal. The student determined that the mass of the metal was 30.2 g. The student placed the metal in a graduated cylinder filled with 20,0 mL of water. The metal increased the volume of water to 22,0 ml.

Write the expression for the equilibrium constant for the reaction represented by the equation CaCO3 (s) ⇌ Ca2 + (aq) + CO3 - (aq). Is Kc > 1, < 1, or ≈ 1? Explain your answer.

Assuming that pressure and temperature are constant, how many liters of oxygen gas will be required to produce 0.160 L of nitrogen gas. 4 NH3 (g) + 3 O2 (g) → 6 H2O (g) + 2 N2 (g)

Aluminum flouride + sulfuric acid=

As glucose is oxidized, how many times do the Krebs (citric acid) cycle turn, and how much NADH, FADH2 and ATP is produced during this process?

The following table shows the period of revolution of some unknown planets of equal mass. Period of RevolutionPlanet Period of Revolution W 1.9 years X 11.