Chemistry

An electron is

• positively charged

• neutral

• negatively charged

Tags

NGSS.MS-PS2-3

atomic number is

• the number of protons

• the number of electrons

• the number of neutrons

• the location of an atom on the periodic table

Atomic Mass is the number of

• protons and neutrons in the nucleus of an atom

• protons and electrons in the nucleus of an atom

• neutrons and electrons in the nucleus of an atom

Tags

NGSS.MS-PS1-1

Conservation of mass means

• all the atoms present before a chemical reaction are not present after

• atoms present before chemical reactions are present after

• new substances and new elements are formed in a chemical reaction

Tags

NGSS.MS-PS1-5

An elements is

• a substance that cannot be split into simpler substances

• a substance that can be split into simpler substances

A pure substance that is a compound is made out of

• particles of more than one type of atom

• particles of the same type of atom

• a mixture of two or more substances that can be physically separated

Tags

NGSS.MS-PS1-1

A molecule is

• a singular particle of a particular element

• another name for an element

• 2 or more atoms that are combined

Tags

NGSS.MS-PS1-1

which of the statements on physical changes are correct

• A physical change cannot be reversed

• A physical change is a change in state

• A physical change is a change in form

• A physical change is where new substances are formed

Tags

NGSS.MS-PS1-4

which of the statements on physical changes are correct

• A physical change cannot be reversed

• A physical change is a change in state

• A physical change is a change in form

• A physical change is where new substances are formed

Signs of a chemical change include;

• change of colour, change of temperature, precipitate (solid) formed, gas released.

• change of colour, reversing back to original form, precipitate (solid) formed, gas released.

Tags

NGSS.MS-PS1-2