Chem Review Sam

Which of these determines the identity of an element?

• number of electrons
• number of protons
• number of energy levels
• number of neutrons

What is formed when two or more elements are  chemically combined?

• atom
• composite
• compound
• mixture

Tags

NGSS.MS-PS1-1

Elements are described as pure substances because

• they are found in nature.
• they cannot be separated into parts by physical means.
• they have no charge.
• they can be produced in a laboratory.

The nucleus of an atom contains

• only neutrons
• protons and electrons
• protons and neutrons
• only electrons

Tags

NGSS.MS-PS1-1

Carbon and oxygen combine chemically to form carbon dioxide. Carbon dioxide is

• an ion
• a nucleus
• a compound
• an atom

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NGSS.MS-PS1-1

Which of these is not made up of two or more substances that are combined physically?

• homogeneous mixture
• compound
• heterogeneous mixture
• solution

Filtration can be used to separate a mixture of

• a solid and a liquid
• a liquid and a gas
• two liquids
• two solids

Which of these processes would be useful for  separating a dissolved solid from a liquid?

• evaporation
• filtration
• sifting
• mixing

Sodium is an element found in table salt. It contains 11 protons and 12 neutrons. How many electrons are found in a neutral atom of sodium?

• 23
• 12
• 11
• 1

Tags

NGSS.MS-PS1-1

How are the elements in the modern periodic table arranged?

• alphabetical order
• by atomic mass
• by date discovery
• by number of protons