What are the contents of a electron cloud?

A student increases the temperature of a 200 cm3 balloon from 60⁰C to 180⁰C. What should the new volume of the balloon be? Use the formula: V2 = (V1 T2) / T1 Question 3 options: 100 cm3 236 cm3 272 cm3 600 cm3

If an exothermic chemical reaction occurs, the surroundings become warmer. Where does this energy come from?

Groups or families in the periodic table have what in common

5.6 moles of gold contain how many atoms? A. 34 atoms B. 9.3 * 10-22 atoms C. 9.3 * 1023 atoms D. 3.4 * 1024 atoms

When rubidium metal is exposed to air, two atoms of rubidium, Rb, combine with one atom of oxygen. If 1.98 grams of rubidium is exposed to air, what will be the mass of the product in grams

Moles of Zn (NO3) 2 in 131.50g of this substance.

Each degree on the Kelvin scale equals: 1°C 10°C no relationship (different scale) 100°C

2C (s) + 2H2 (g) → C2H4 (g) : ΔH = + 52.4 kJ/mol Which statement about this reaction is correct?

A chemist dissolves 660. mg of pure hydroiodic acid in enough water to make up 300. mL of solution. Calculate the pH of the solution. Round your answer to 3 significant decimal places.

What type of radiation wave from the Sun does this graphic display? answer choices: x rays microwave visible ray infrared ray