What do all atoms of an element have in common? What number can be different and allow the atom to still be the same element

A reaction produced 37.5 L of oxygen gas at 307 K and 1.25 atm. How many moles of oxygen were produced?

A) Suggest any three methods for the preparation of H2 gas by selecting suitable substance given below. Na, Zn, CaH2, H2O, Al, NaOH, HCl

Which of the following equations is balanced? 2H2 + O2 → 4H2O 4Na + O2 → 2Na2O Fe2O3 + H2 → 2Fe + 3H2O CH4 + O2 → CO2 + H2O

What happens to your ribs when you inhale?

How long does kool aid last in your hair?

Alka-Seltzer is a solid mixture of two substances, sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7). The substances react to form water, carbon dioxide (CO2), and Na3C6H5O7.

Four properties of water are listed. 1. It is colorless and odorless in its pure form. 2. It reacts with metals to form metal hydroxide and hydrogen gas. 3. When heated to 100 °C, water evaporates. 4. It decomposes to form hydrogen and oxygen.

Water is A. Acidic B. Basic C. Neutral

What variables affect the acceleration of an object and in what manner do they affect the acceleration?

How do valence electrons relate to the chemical reactions of an element?