science final rev 1

What is an element?

made of only one dupe of element.

Charge of an electron?

negative

What are electrons attracted too?

positive charges, such as protons.

What does the atomic number tell you?

number of protons in an element

what particles are in a nucleus?

protons (positively charged) and neutrons (no charge - neutral)

Isotope

Atoms with same number of protons but different number of neutrons

Three traits of metal?

shiny and conductive

List 3 traits of nonmetal

dull, insulating, brittle

Which metal is a liquid at room temperature?

Mercury (Hg)

Which nonmetal is a liquid at room temp?

Bromine (Br)

Where are metalloids found on the periodic table?

Staircase

What is a compound?

Chemically combined atoms of 2 or more different elements

How many atoms are in H₂O, H₂O₂, and CH₄?

H₂O = 3, H₂O₂ = 4, CH₄ = 5

What is a mixture?

Two substances mixed together but keeping their properties.

What is a homogeneous mixture?

Evenly mixed (can’t see particles)

What is a heterogeneous mixture?

Unevenly mixed (can see particles)

What are the 2 traits of a solid?

Definite shape, definite volume

What are the 2 traits of a liquid?

Indefinite shape, definite volume

What are the 2 traits of a gas?

Indefinite shape, indefinite volume

What is thermal energy?

Total potential + kinetic energy of the particles of a substance

How do particles move when temperature increases?

They move faster