12.0 7th Grade Benchmark Reflection

The protons and neutrons are inside of the nucleus, and contain almost all of _____

• the charge of the atom
• the volume of the atom
• the mass of the atom
• the kinetic energy of the atom

Tags

NGSS.MS-PS1-1

Which of the following is a subatomic particle with no charge that is found in the nucleus of an atom?

• Electron
• Proton
• Neutron
• Quark

Tags

NGSS.MS-PS1-1

Which of the following chemical formulas represents a compound?

• C₃

• O₂

• CH₄

• He₂

This picture represents which of the following?

• element

• compound

This diagram represents a _____.

• pure substance that is a compound
• mixture of elements
• pure substance that is an element
• mixture of compounds

Tags

NGSS.MS-PS1-1

This diagram represents a _____.

• pure substance that is a compound
• mixture of elements
• pure substance that is an element
• mixture of compounds

Tags

NGSS.MS-PS1-1

Which of the following is true of the law of conservation of mass?

• The same number and type of each atom will always be present before and after a chemical reaction takes place.
• Some of the atoms present before the reaction will always be lost during a chemical reaction.
• Some of the atoms will always be changed into a different type of atom by a chemical reaction.
• During a chemical reaction, atoms will always be combined into much larger molecules.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which shows the law of conservation of mass?

• A
• B
• C
• D

Tags

NGSS.MS-PS1-5

Which pair of properties describes the elements in group 18?

• They have 8 valence electrons and are very reactive.

• They have 8 energy levels and are stable.

• They are gases at room temperature and are stable.

• They are gases at room temperature and very reactive.

Which of the following is the most metallic element in period 3?

• Boron (B)
• Sodium (Na)
• Argon (Ar)
• Silicon (Si)