An atom contains 4 protons, 3 neutrons, and 5 electrons. what is its total electric charge?

3. What other chemical reactions release oxygen gas?

How a mineral's chemical make-up looks like?

What is the change of e-

Moles of zn (no3) 2 in 151.50 g of this substance.

Milk of magnesia has the chemical formula Mg (OH) 2. What is the mass of 3.2 moles of milk of magnesia? The molar Mass of magnesium is 24.3 grams per mole. The molar mass of hydrogen is 1.0 grams per mole. The molar mass of oxygen is 16.

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets

At which temperature would atoms of a He (g) sample have the greatest average kinetic energy? (1) 25°C (3) 273 K (2) 37°C (4) 298 K