Sc 7 P 10 2

The mass of an element is the sum of the atomic number and the number of __________.

• electrons

• ions

• neutrons

• protons

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which of the samples shown represents a pure substance?

• substances 1 and 2

• substances 2 and 3

• substances 3 and 4

• substances 1 and 4

Tags

NGSS.MS-PS1-1

The periodic table of the elements organizes elements according to their properties. A section of the periodic table is shown.

Which set of elements below is the most similar in chemical behavior?

• H, Be, Sc

• Fr, Ra, Rf

• Ti, V, Cr

• Be, Ca, Ra

Tags

NGSS.MS-PS1-1

Two common liquids, water and peroxide, are both formed with atoms of hydrogen and oxygen. If both substances discussed above are made of hydrogen and oxygen, how is the make-up of the two substances different?

• The number of atoms of each element is different.

• The number of protons in the atoms of each element is different.

• The number of protons in the atoms of each element is different.

• The number of protons in the atoms of each element is different.

Tags

NGSS.MS-PS1-1

Since sodium chloride is classified as a compound, a sample of it contains...

• atoms that are gases, liquids, and solids.

• more than one kind of atom

• matter than cannot be reduced into atoms

• a solution of atoms and molecules

Tags

NGSS.MS-PS1-1

What do carbon, hydrogen, and oxygen atoms have in common?

• the same number of protons

• he same number of electrons

• neutrons located outside of the nucleus

• electrons located outside of the nucleus

Sodium metal (Na) reacts violently when mixed with water and produces sodium hydroxide (NaOH) and hydrogen gas (H2).

Which metal would most likely react in a similar fashion?

• magnesium (Mg)

• aluminum (Al)

• potassium (K)

• titanium (Ti)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of these is not an example of a pure substance?

• aluminum can

• milk

• table salt

• water

An atom's atomic number of an element is the number of protons in the nucleus of one of its atoms.

• True

• False

The nucleus of an atom is its tiny central region, and comprises the bulk of the atom's mass, containing the protons and neutrons.

• True

• False

Tags

NGSS.MS-PS1-1