In a heating curve, when is the temperature constant? need answers!

1. during a phase change

2. during a pressure change

3. during a change in kinetic energy

4. during a change in molecular velocity

When you expose a wet iron nail (Fe) to the oxygen in air (O2), you will notice that rust, or iron oxide (Fe3O4), forms on its surface. Which of the following statements is true? a.

What are the examples of Alkaline Earth metals?

What are the chemical properties for the boron family

Solubility Which of the following are nonelectrolytes? * Pentacarbon decahydride (C5H10) O Magnesium chloride (MgCl2) O Copper phosphate (Cu3 (PO4) 2] Sulfur trioxide (SO3) O 0 Aluminum oxide (A1203) Phosphorus pentachloride (PC15) Glucose (C6H1206)

An electron that is in the highest energy level of an atom and determines the atom's chemical properties is called a (n) paired electron. opposite-spin electron. valence electron. extra electron.

Which principle explains why it is necessary to have safety belts in cars?

Hydrochloric acid is purchased in 12 molar concentrations. If I needed 200 ml of 2.0 molar HCl, how many milliliters of the concentrated solution would I need

Which of the following represents a chemical change? Bending a wire Freezing of water Fireworks exploding Melting of a wax candle

5.00 L of a gas is collected at 100K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure? A. 400 °C B. 127 °C C. 223 °C D. 627°C

Before the initial explosion was the matter hot or cold