Matter and atoms

Matter and atoms

Multiple Choice

Which is a substance?

• fruit salad

• granola cereal

• spaghetti bolognese

• table salt

Multiple Choice

Which is the best model for a homogeneous

mixture?

Multiple Choice

Which is a property of all atoms?

• more electrons than protons

• a nucleus with a positive charge

• a positively charged electron cloud

• same number of protons as neutrons

Multiple Choice

Which is another name for a solution?

• element

• compound

• heterogeneous mixture

• homogeneous mixture

Multiple Choice

Which would you most likely be able to

separate into its parts by strainer?

• heterogeneous mixture of two liquids

• heterogeneous mixture of two solids

• homogeneous mixture of two liquids

• homogeneous mixture of two solids

Multiple Choice

Where is almost all the mass of an atom

located?

• in the electrons

• in the neutrons

• in the nucleus

• in the protons

Multiple Choice

Which best describes an electron cloud?

• an area of charged particles with a fixed

  boundary

• electrons on a fixed path around the

  nucleus

• mostly empty space with tiny charged

  particles in it

• a solid mass of charge around the

  nucleus

Multiple Choice

Which is true about carbon-12 compared

with carbon-13?

• Carbon-12 has more neutrons.

• Carbon-12 has more protons.

• Carbon-13 has more neutrons.

• Carbon-13 has more protons

Multiple Choice

Look at the periodic table block for

potassium. How many electrons does an

uncharged atom of potassium have?

• 19

• 20

• 39

• 40

Multiple Choice

How many atoms are in the particle?

• 1

• 2

• 3

• 5

Multiple Choice

Which kind of matter might contain only this

type of particle?

• a compound

• an element

• a heterogeneous mixture

• a homogeneous mixture

Multiple Choice

Which class of matter is the least evenly

mixed?

• compounds

• heterogeneous mixtures

• homogeneous mixtures

• solutions

Multiple Choice

Which correctly describes a compound but

not a mixture?

• All the atoms are of the same element.

• All the molecules have at least two

  atoms.

• The combination of substances never

  changes.

• The substances can be separated without breaking bonds.

Multiple Choice

A girl pours a spoonful of sugar into a glass of

warm water. She stirs the water until the sugar

disappears. When she tastes the water, she

notices that it is now sweet. Which describes

the kind of matter in the

glass?

• a compound

• an element

• a solution

• a substance

Multiple Choice

How could you separate a mixture of

stone and wooden beads that are all the

same size?

• Add water to the mixture and skim off the

  wooden beads, which float.

• Heat the mixture until the stone beads

  melt.

• Strain the mixture to separate out the

  stone beads.

• Use a magnet to pull out the wooden

  beads.

Multiple Choice

The figure shows models of three different

atoms. What can you conclude about the

three models shown in the figure?

• They all show positive ions.

• They all show negative ions.

• They all show the same element.

• They all show the same isotope.

Multiple Choice

What is the atomic number of an atom that

has 2 electrons, 3 protons, and 4 neutrons?

• 2

• 3

• 4

• 7

Multiple Choice

The table shows the numbers of protons, neutrons, and electrons for four atoms.

Which atom has a negative charge?

• A

• B

• C

• D

Multiple Choice

Which of the atoms is a different element than

the others?

• A

• B

• C

• D