michelle

which is not a clue could indicate a chemical change

• change in color

• change in shape

• change in energy

• change in odor

Which type of mixture has uniform composition throughout and appears as a single phase?

• Homogeneous mixture

• Heterogeneous mixture

• Pure substance

• Compound

when a new substance is formed with different properties than the original substance it is called a?

• chemical change

• physical change

• freezing

• boiling

Which among the samples below is a suspension?

• water

• milk

• water mix with soil

• n/a

 

Which is the electron configuration for an oxygen atom?

• 1s2 2s2 2p6 3s2 3p6 4s2

• 1s2 2s2 2p4

• 1s2 2s2 2p6

• 1s2 2s2 2p6 3s2 3p6

 

Velocity= ________
Wavelength= .5m
Frequency= 150 hertz

{Ar} 4s 3d 4p

• Ar

• Br

• Cu

• Cl

what is the atomic number for neon (ne)?

• 10

• 20

• 30

• 179

Oxygen group has how many valence electron?

• 3

• 4

• 5

• 6

1s 2s 2p

• B

• N

• O

• Mg