Chemistry

The number of protons and electrons in the atom.

If the number of protons = number of electrons, it is electrically neutral.

If number of protons > number of electrons, it is positively charged.

If number of protons < number of electrons, it is negatively charged.

A cubic meter is about the same as the space occupied by a washing machine.

There are 22 atoms of hydrogen, 12 atoms of carbon, and 11 atoms of oxygen.

You start by converting that to kilometers per hour, which would be 48 kilometers per hour. An hour contains 60 seconds, and to convert to smaller units of time, you divide, so 48/60 is 0.8 kilometers per minute.

20 + 88 = 108

Salt water. Homogeneous means that you can't see the particles

5 over 12

0.000000000154m can be written as 1.54 × 10-10min scientific notation.

atoms chemically combine

It did not explain the behavior of chemicals

The number of significant figures should be equal to the significant figures in the least precise measurement.

The beam was repelled by the negative charged plate and attracted by the positively charged plate

No. The number of neutrons is represented by the element's atomic number, not the mass number.

5008 km = 5.008 × 103 km

Yes. The word atomos means indivisible.

Oxidation or reaction with oxygen is a chemical property

a particle that cannot be divided or destroyed

1.3 x 10 to the 5th

Fermenting cheese and grating cheese are chemical changes.

A pure substance has a fixed and uniform composition.