6th Grade Science

Which of the following has the most kinetic energy?

• Ice cube (solid)

• Steam (gas)

• Water (liquid)

• Frozen metal

Answer explanation

Steam (gas) has the most kinetic energy because gas particles move more freely and rapidly compared to solids (ice cube, frozen metal) and liquids (water), resulting in higher energy levels.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

As heat increases, what happens to kinetic energy and particle movement?

• Kinetic energy decreases, particles slow down

• Kinetic energy increases, particles move faster

• Particles stop moving

• Energy turns into gravity

Answer explanation

As heat increases, the kinetic energy of particles also increases, causing them to move faster. This is why the correct answer is that kinetic energy increases and particles move faster.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which is a characteristic of a heterogeneous mixture?

• Looks the same throughout

• Different parts are easily seen

• Made of one kind of atom

• Cannot be separated

Answer explanation

A heterogeneous mixture is characterized by having visibly different parts. This means that the components can be easily seen and distinguished from one another, unlike homogeneous mixtures which look the same throughout.

Which classification is correct for salt in water (completely dissolved)?

• Pure substance

• Heterogeneous mixture

• Homogeneous mixture

• Compound

Answer explanation

Salt in water forms a homogeneous mixture because the salt completely dissolves, creating a uniform solution. Unlike heterogeneous mixtures, the components are not distinguishable, making it a single phase.

Can a substance be both pure and homogeneous?

• Yes

• No

• Only mixtures can be homogeneous

• Only elements can be pure

Answer explanation

Yes, a substance can be both pure and homogeneous. A pure substance has a uniform composition and properties throughout, which is the definition of homogeneity. Examples include elements and compounds.

Where are most metals located on the periodic table?

• Right side

• Top row

• Left and middle

• Bottom right

Answer explanation

Most metals are located on the left and middle of the periodic table, where elements like alkali metals and transition metals are found. The right side primarily contains nonmetals and metalloids.

Where are nonmetals located?

• Right side

• Center

• Bottom

• All around the table

Answer explanation

Nonmetals are primarily located on the right side of the periodic table. This area includes elements like oxygen, nitrogen, and carbon, which are essential for life and have distinct properties compared to metals.

Where are metalloids found?

• Far left

• Bottom rows

• Zig-zag staircase

• Next to noble gases

Answer explanation

Metalloids are located along the zig-zag staircase line on the periodic table, which separates metals and nonmetals. This unique position gives them properties of both categories.

Where are rare earth elements located?

• Middle top

• Two rows at the bottom

• In group 1

• Around transition metals

Answer explanation

Rare earth elements are located in the two rows at the bottom of the periodic table, known as the lanthanides and actinides, which are distinct from the main body of the table.

If a substance has a density of 2.7 g/cm³, where will it settle in a column with 1.0, 3.0, and 5.0 g/cm³ layers?

• Float on top

• Sink to the bottom

• Between 1.0 and 3.0 layers

• Dissolve in the layer

Answer explanation

A substance with a density of 2.7 g/cm³ will settle between the 1.0 g/cm³ and 3.0 g/cm³ layers, as it is denser than the first layer but less dense than the second layer.