What hypothesis states that the continents were once joined to form a single supercontinent? A. continental drift B. paleomagnetism C. plate tectonics D. sea-floor spreading

Chlorine has an atomic number of 17. How many protons are in an atom of chlorine? A. 17 B. 18 C. 35 D. 52

How many atoms are in 15 moles of cadmium?

An atom is made of 16 protons, 17 neutrons, and 18 electrons. What is the mass number of this atom?

The United States established the Open Door policy toward China as a way to (1) promote democracy in Asia (2) secure military bases in East Asia (3) protect United States economic interests (4) end the Boxer Rebellion

In the ground state, which noble gas has atom with the same electrons configuration as a magnesium ion

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