A heating curve has two flat lines, or plateaus. What does the plateau at the higher temperature represent?

1. Boiling of a liquid

2. Melting of a solid

3. Increase in temperature of a substance

4. Decrease of a substance

This decomposition is first order with respect to phosphine, and has a half‑life of 35.0 s at 953 K. Calculate the partial pressure of hydrogen gas that is present after 70.5 s if a 2.20 L vessel containing 2.

What do nuclear reactions change in atoms

2C6H14 + 19O2 → 12CO2 + 14H2O How many atoms, total, are reacting in this equation?

What are the main functions of estrogen and progesterone during the follicular and luteal phases?

Which is true of transition metals when moving from left to right on the periodic table? The d sublevels are not filled across the period. The cation radii become larger across the period. Atomic radii increase slightly and then start to decrease.

Which of the following statements is true? A. Some chemical reactions release energy, and other chemical reactions absorb energy. B. Chemical reactions, by definition, cannot absorb or release energy. C.

4 Properties of Bases?

Which statement best describes the intermolecular forces between N2 molecules and NH3 molecules in the solid phase? A.

How many grams of water are needed to react with 485 g of calcium carbide

Water molecules have a strong attraction to each other because of hydrogen bonding, allowing water to move against gravity up a plant's stem through capillary action. True False