June 2019 Chemistry Regents Questions 1-10 Question Preview (ID: 59727)

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Which particles are found in the nucleus of an argon atom?

a) protons and electrons

b) positrons and neutrons

c) protons and neutrons

d) positrons and electrons

Which particle remains undeflected when passing through this electric field?

a) proton

b) electron

c) neutron

d) positron

The mass of an electron is

a) equal to the mass of a proton

b) equal to the mass of a neutron

c) greater than the mass of a proton

d) less than the mass of a neutron

Compared to the energy of an electron in the second shell of an atom of sulfur, the energy of an electron in the

a) first shell is lower

b) first shell is the same

c) third shell is lower

d) third shell is the same

In the ground state, an atom of which element has seven valence electrons?

a) sodium

b) phosphorus

c) nitrogen

d) fluorine

Which information is suffi cient to differentiate a sample of sodium from a sample of silver?

a) the mass of each sample

b) the volume of each sample

c) the reactivity of each sample with water

d) the phase of each sample at room temperature

Graphite and diamond are two forms of solid carbon at STP. These forms have

a) different molecular structures and different properties

b) different molecular structures and the same properties

c) the same molecular structures and different properties

d) the same molecular structures and the same properties

As the fi rst fi ve elements in Group 14 are considered in order from top to bottom, there are changes in both the

a) number of valence shell electrons and number of first shell electrons

b) electronegativity values and number of first shell electrons

c) number of valence shell electrons and atomic radii

d) electronegativity values and atomic radii

Which statement explains why NaBr is classified as a compound?

a) Na and Br are chemically combined in a fixed proportion.

b) Na and Br are both nonmetals.

c) NaBr is a solid at 298 K and standard pressure.

d) NaBr dissolves in H2O at 298 K.

Which two terms represent types of chemical formulas?

a) fission and fusion

b) oxidation and reduction

c) empirical and structural

d) endothermic and exothermic

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