Chemistry

Which of the following results in a substance not transforming into a completely new substance?

• Physical change

• Physical property

• Chemical change

• Chemical property

Tags

NGSS.MS-PS1-2

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

• The basketball is orange.

• The gasoline is flammable.

• The bike is made of metal.

• The slice of cheese is a solid.

Tags

NGSS.MS-PS1-2

What is the main difference between a physical change and a chemical change?

• Physical changes alter the composition whereas chemical changes alter the appearance of a substance

• Physical changes describe the appearance of a substance whereas chemical changes describe qualities only observed with a reaction.

• Physical changes describe qualities only observed with a reaction whereas chemical changes describe the appearance of a substance.

• Physical changes alter the appearance whereas chemical changes alter the composition of a substance.

Tags

NGSS.MS-PS1-2

Which of the following statements about elements and compounds is accurate?

• Elements are many different types of atoms together but compounds are just one type of atom.

• Elements are pure substances that cannot be broken down physically but compounds are pure substances that can be broken down physically.

• Elements are not found on the Periodic Table but compounds are found on the Periodic Table.

• Elements are pure substances that cannot be broken down chemically but compounds are pure substances that can be broken down chemically.

Which of the following could be the chemical formula for a compound?

• Na

• CO2

• H2 + O2

• Au

Tags

NGSS.MS-PS1-1

Which of the following could be the chemical formula for an element?

• Si₂

• H₂O

• C + O₂

• C₆H₁₂O6

Tags

NGSS.MS-PS1-1

Which of the following statements is true regarding the atomic number of an element?

• The atomic number is the number of protons in an element

• The atomic number is the number of electrons in an element.

• The atomic number is the number of neutrons in an element.

• The atomic number is the mass of the nucleus of an element.

Tags

NGSS.HS-PS1-8

The horizontal rows on the Periodic Table are referred to as which of the following?

• Groups or Families

• Periods or Rows

• Columns or Rows

• Valence or Orbitals

The vertical columns on the Periodic Table are referred to as which of the following?

• Groups or Families

• Periods or Rows

• Columns or Rows

• Valence or Orbitals

What does the Periodic Table help scientists do?

• Identify the most common compounds found on Earth.

• Create mixtures of elements in order to make new elements.

• Make predictions about what kind of properties new elements might have.

• Determine how expensive each element is to mine from the Earth.