Preap Chemistry

Which subatomic particles are located in the nucleus?

• Electrons and protons

• protons and neutrons

• neutrons and electrons

• protons

How many neutrons would ¹¹₅B^-2 have?

• 11

• 4

• 7

• 6

How many neutrons would this ion have?

• 12

• 11

• 23

• 22

Tags

NGSS.HS-PS1-8

When is an atom considered electrically neutral?

• The number of proton forces pull on the neutron

• The number of electrons are equal to the number of protons

• The number of neutrons equal the number of protons

• The number of electrons are equal to the number of neutrons

How many electrons are in Co^-2

• 61

• 57

• 29

• 25

Tags

NGSS.HS-PS1-1

An isotope of Copper (Cu) has 29 protons and 64 neutrons. what is the mass of this isotope?

• 29

• 64

• 35

• 93

Which of the following statements about atomic structure is false?

• Almost all of the mass of the atom is concentrated in the nucleus

• The number of protons and neutrons is always the same in a a neutral atom

• An electron has negligible mass within the atom and therefore doesn't contribute to mass

• The protons and neutrons in the nucleus are very dense compared to the rest of the atom

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

An isotope, Z, of a particular element has 12 protons and 13 neutrons. Therefore:

• Z is an isotope of Magnesium (Mg)

• Z has a mass of 13

• Z is an isotope of Aluminum (Al)

• Z has a mass of 12

Tags

NGSS.MS-PS1-1

Copper (8.96 g/cm³) is used in amplifiers. If a chemist has a sample that is 12.1 cm³, what would the mass be?

• 108g

• 121g

• 0.741g

• .009g

A block of would with a volume of 1.5 cm³ and a density of 0.69 g/cm³ is cut in half. What would be the density of the two smaller blocks?

• 1/4 the original density

• 1/2 the original density

• two times the original density

• the same as the original density