Gen Chem

A scientist is working in the lab, with compounds containing carbon. She is most likely working in the field of

• Organic
• Inorganic
• Analytical
• Physical

The smallest unit of matter that retains the properties of that matter is

• a molecule
• a compound
• a mixture
• an atom

Which statement best describes an element?

• any combination of two or more atoms of different types
• a pure substance made up of only one kind of atom
• a substance containing only carbon atoms
• any kind of crystal

Which of the following changes is a physical change of matter?

• water evaporating
• paper burning
• a nail rusting
• a silver spoon tarnishing

Tags

NGSS.MS-PS1-4

Which of the following changes is a chemical change of matter?

• ice melting to produce water
• vinegar combining with baking soda to produce carbon dioxide
• water boiling to produce water vapor
• liquid silica solidifying to form glass

Tags

NGSS.MS-PS1-2

Which of the following is an example of a heterogeneous mixture?

• tap water
• chunky peanut butter
• orange-colored sugar water
• gold ring

Which of the following is a pure substance?

• air
• granite
• water
• stainless steel

The horizontal rows of the periodic table are called

• periods
• columns
• groups
• families

Which of these recorded observations is qualitative, rather than quantitative?

• A chemical reaction is complete in 2.3 s.
• The solid has a mass of 23.4 g.
• The compound melts at 87.5C.
• Iron is denser than aluminum.

Which of these statements is true of the scientific method?

• The steps may vary somewhat to suit the experiment.
• Working scientists rarely use it.
• Scientists must follow its steps exactly.
• Scientists rarely publish results of experiments.

Tags

NGSS.MS-PS1-2