Which of the following is true about light waves?

1. They travel at the same speed through matter and empty space.

2. They cannot travel through matter.

3. They slow down when traveling through matter.

4. They are a type of compressional wave.

What do nuclear reactions change in the atom? covalent bonds ionic bonds electrons neutrons protons you can choose multiple

Acids turn litmus paper what color? A-pink B-blue C-yellow D-red

Do the water molecules absorb or release energy during the change from a gas to a liquid?

How many significant figures are in the measurement 40, 500 mg? a) two b) three c) four d) five

How many liters of 4.0 M NaOH solution will react with 0.60 liters 3.0 M H2SO4? H2SO4 + NaOH - > Na2SO4 + H2O A. 0.90 L B. 1.0 L C. 1.1 L D. 2.1 L

Ice (H2O) melting at 273 K and 1 atm has = 6.01 kJ/mol and = 6.01 kJ/mol while water vaporizing under the same conditions has = 37.6 kJ/mol and = 40.7 kJ/mol. Why is there such a large difference between and, but not for and?

What happens to the charges when an ionic compound forms

We dissolve 93 grams of sodium sulfate (Na2SO4) in 20 grams of water. What is the percent by mass of sodium sulfate in this solution? Answer in units of %.

The modern atomic model includes electrons orbiting the nucleus. which of the following parts of dalton's atomic model was disproved by the discovery of the electron? - atoms are tiny particles. - atoms cannot be divided into smaller parts.

tandard reduction potentials are 1.455 V for the PbO2 (s) / Pb (s) couple, 1.82 V for Co3 (aq) / Co2 (aq), 3.06 V for F2 (g) / HF (aq), 1.07 V for Br2 (l) / Br - (aq), and 1.77 V for H2O2 (aq) / H2O (l).