Science Chapter

When you eat an apple, the process of digestion involves:

• physical change only.

• chemical change only.

• physical and chemical change.

• phase change.

Tags

NGSS.HS-LS2-3

NGSS.HS-PS1-4

Evidence for a chemical change includes all of the following EXCEPT:

• phase change.

• color change.

• temperature change.

• production of bubbles.

Tags

NGSS.MS-PS1-2

A solid that forms and is insoluble in the reaction mixture is called a:

• period.

• reactant.

• gas.

• precipitate.

Of the following, the one which most likely involves a chemical reaction is:

• Slicing a piece of bread produces two pieces.

• Placing a solid and a liquid together produces heat and a gas.

• Hitting a board with a hammer forms a dent in the surface of the wood.

• Heating an ice cube produces liquid water.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the equation:

Pb(NO)₃(aq) + 2KI(aq) --> PbI₂(s) + 2KNO₃(aq)

in what form does PbI₂ appear?

• Solid

• Liquid

• Precipitate

• Both solid and precipitate

In the reaction,

2H₂(g) + O₂(g) --> 2H₂O(l)

the phase of matter in which the reactants appear is:

• solid

• liquid

• gas

• plasma

Tags

NGSS.MS-PS1-4

In the periodic table notation below, what information does the number 40.08 tell you?

• The number of protons

• the number of neutrons

• the atomic number

• the atomic mass

Tags

NGSS.HS-PS1-1

The Avogadro number is equal to:

• one mole of a substance

• 6.02 x 10²³ molecules

• the number of atoms in the atomic mass of an element when mass is expressed in grams

• all of the above

The sum of the atomic mass values of the atoms in a chemical formula is known as the:

• formula mass

• molar mass

• inertial mass ratio

• atomic mass ratio

Tags

NGSS.HS-PS1-7

What is the whole number placed in front of a molecular formula in a chemical equation called?

• subscript

• superscript

• coeffecient

• mole