August 2017 Chemistry Regents

1 Which phrase describes an Al atom?

(1) a negatively charged nucleus, surrounded by

negatively charged electrons

(2) a negatively charged nucleus, surrounded by

positively charged electrons

(3) a positively charged nucleus, surrounded by

negatively charged electrons

(4) a positively charged nucleus, surrounded by

positively charged electrons

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

What is the number of electrons in an atom that has 20 protons and 17 neutrons?

• 37

• 3

• 20

• 17

Tags

NGSS.MS-PS1-1

The mass of a proton is approximately equal to the mass of

• an electron

• an alpha particle

• a neutron

• a beta particle

When a sample of CO2(s) becomes CO2(g), there is a change in (1) bond type (2) gram-formula mass (3) molecular polarity (4) particle arrangement

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-4

Which properties are characteristic of Group 2 elements at STP?

(1) good electrical conductivity and electronegativities less than 1.7

(2) good electrical conductivity and electronegativities greater than 1.7

(3) poor electrical conductivity and electronegativities less than 1.7

(4) poor electrical conductivity and electronegativities greater than 1.7

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-1

Compared to an atom of C-12, an atom of C-14 has a greater

(1) number of electrons

(2) number of protons

(3) atomic number

(4) mass number

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-8

Elements that have atoms with stable valence electron configurations in the ground state are found in

• Group 1

• Group 8

• Group 11

• Group 18

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A magnesium atom that loses two electrons becomes a

(1) positive ion with a smaller radius

(2) negative ion with a smaller radius

(3) positive ion with a larger radius

(4) negative ion with a larger radius

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An atom of which element has the strongest attraction for the electrons in a bond?

• aluminum

• chlorine

• carbon

• lithium

Tags

NGSS.HS-PS1-1

Which type of matter can not be broken down into simpler substances by a chemical change?

• an element

• a mixture

• a solution

• a compound