First Semester Exam Review

Silicon is an element that has metallic shininess, has a good heat conductivity, and is not brittle. Silicon is most likely a

• compound.

• metalloid.

• nonmetal.

• metal.

Which of the following is true for covalent bonding?

• Electrons are shared

• Oxidation numbers are always negative

• Electrons are transferred

• Particles are always positively charged

Tags

NGSS.MS-PS1-1

A mass of gas is enclosed in a rigid container. What will occur if the velocity of the gas molecules colliding with the sides of the container increases?

• The density of the gas will increase

• The pressure of the gas will increase

• The pressure of the gas will decrease

• The density of the gas will increase

Tags

NGSS.MS-PS3-5

Which of the following BEST describes what happens in a fusion reaction?

• A single nucleus divides into two or more nuclei and gives off energy

• Electrons are shared between the nuclei

• Two low mass nuclei are joined to form one nucleus and gives off energy

• A chemical reaction occurs between the nuclei

Tags

NGSS.HS-PS1-8

A neutral atom of which element contains 10 electrons?

• Neon

• Boron

• Fluorine

• Lithium

Which two elements have the most similar chemical properties?

• Cl and Ar

• Na and P

• Ca and Br

• Be and Mg

Look at the following chemical equation:

2H₂O --> 2H₂0 + O₂

Does this equation follow the conservation of mass?

• Yes, because the mass of the reactants is greater than the mass of the products.

• No, because the mass of the reactants is less than the mass of the products.

• No, because the coefficient of the reactant is less than the coefficient sum of the products.

• Yes, because each atom that is in the reactants is found in the products.

Tags

NGSS.MS-PS1-5

Which pH value indicates a basic solution?

• 1

• 12

• 5

• 7

How does the molecular motion of a substance change when it goes from liquid to solid?

• The molecules gain energy,

• The molecules lose energy, and their relative motion decreases.

• The molecules lose energy, and their relative motion increases.

• The molecules energy stays constant, and there is no change in motion.

Tags

NGSS.MS-PS1-4

An atom of an element contains 6 protons, 6 neutrons, and 6 electrons. An atom that is a different isotope of this element would contain:

• 7 protons, 6 neutrons, and 6 electrons

• 6 protons, 6 neutrons, and 7 electrons

• 6 protons, 7 neutrons, and 6 electrons

• 7 protons, 7 neutrons, and 7 electrons