Which of these pairs of elements have the same number of valence electrons?

hydrogen (H) and helium (He)

sodium (Na) and potassium (K)

carbon (C) and oxygen (O)

boron (B) and beryllium (Be)

What are the products of the neutralization reaction H Br + Ba (OH) little 2

Which describes the state at which products form at the same rate as reactants?

Explain how the system of the flask and the balloon illustrates the conservation of mass.

When dissolved substances are spread evenly throughout a mixture it is called a

If you pour water out from a bucket, does the density of the remaining water change?

The atomic mass of fluorine in 19.0 amu, so the molar mass is?

A rod shaped organism with no nucleus commonly found in Garbage will most likely belong to which kingdom

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