What percentage of atoms in the entire universe are hydrogen atoms?

An investigation that is controlled

Michael mixes two chemicals together in a beaker. The chemicals change color, and the beaker heats up quickly. What kind of change most likely occurred? A chemical change occurred. Only a physical change occurred. A mixture formed.

As you continue to heat it, boiling water in an open pot will: 1) continue to get hotter 2) get cooler 3) will remain at 100

all chemicals, even safe chemicals, such as sodium chloride (table salt), are toxic if exposure is high enough. (true or false)

Melinda's science techer gave her an unknown substance to identify based on its properties. After a few tests, Melinda listed her observations in a chart.

Which type of reaction will occur when equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed 1. Neutralization 2. Ionization 3. Electrolysis 4. Hydrolysis

What is molarity of heavy water?

Do all liquids freeze at the same rate

Convert 1.67 x10^24 atoms of carbon to moles of carbon

The knowledge of chemistry not important in one of the following? A, in agriculture B, in Geology C, in medicine D, none