Explain why the sodium ions and chloride ions are attracted to eachother

An interglacial is a period of time that occurs between Ice Ages. It's marked by warmer temperatures and milder climates. During previous interglacials, the CO2 levels in the atmosphere were about 280 parts per million (ppm).

Which of the following isotopes would most likely be unstable and therefore radioactive? helium-3 calcium-40 molybdenum-98 mercury-194

For main-group elements, are outer electron configurations similar or different within a group? Within a period? Explain.

Barium-131 is a radioactive isotope of the element barium used for gastrointestinal tract scans in doctors offices. Barium-131 has a half-life of 10 days.

What causes gas pressure in a container such as a helium balloon?

If you measure the mass of a model car to be 230 grams. the actual mass is 218 grams. what is your percent error.

If I have 1.9 moles of gas held at a pressure of 5 atm and in a container with a volume of 50 liters, what is the temperature of the gas?

A student measured 1.0 kcal when the student combined 99.7 mL of 3 M HCl with 100 mL of 3 M NaOH. Given that the reaction is HCl (aq) + NaOH (aq) → NaCl (aq) + H2O what was ΔHneutralization per mole of water?

Which is the odd one brass, copper, aluminum, iton, sapphire

What best describes the collisions between ideal gas molecules?