6th Period Final Review

Which of the following correctly expresses 0.000570 in scientific notation?

• 5.7×10⁴
• 5.70×10⁻⁴
• 57.0×10⁻⁵
• 0.570⁻³

Which of the following is an example of a chemical change?

• Water boiling into steam
• A bicycle rusting in the rain
• Sugar dissolving in tea
• An ice cube melting

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following describes a physical change?

• Burning wood
• Baking a cake
• Digesting food
• Chopping vegetables

A substance has a mass of 25 g and a volume of 5 mL. What is its density?

• 0.2 g/mL
• 5 g/mL
• 125 g/mL
• 20 g/mL

Which of the following is a heterogeneous mixture?

• Saltwater
• Air
• Sand and water
• Brass (an alloy of copper and zinc)

What is the name of the phase change when a solid turns directly into a gas?

• Sublimation
• Deposition
• Condensation
• Vaporization

Tags

NGSS.MS-PS3-4

A student measures the boiling point of water to be 98.5 °C. The accepted value is 100.0 °C. What is the percent error?

• 1.5%
• -1.5%
• 98.5%
• -98.5%

What is the smallest particle of an element that retains the chemical identity of that element?

• Molecule
• Compound
• Atom
• Ion

Which subatomic particle is found in the nucleus and has a positive charge?

• Electron
• Proton
• Neutron
• Photon

An isotope of uranium is represented as ​U-235. How many neutrons does it have?

• 92
• 235
• 143
• 327