Periodic Table

How many different elements are in this chemical formula: C₂H₂ClK₃

• 6
• 8
• 2
• 4

Tags

NGSS.MS-PS1-1

Which of the following is a pure substance?

• O₂
• Al₂CO₅
• C₆H₁₂O₆
• SiO₂

Tags

NGSS.MS-PS1-1

Which of the following chemical formulas represents a compound? 

• C₃
• O₂
• CH₃CHO
• H₂

Tags

NGSS.MS-PS1-1

Which of the following atomic symbols for bromine is written correctly?

• bR
• BR
• Br
• br

What is krypton?

• element
• compound
• mixture

Tags

NGSS.MS-PS1-1

What is water?

• element
• compound
• mixture

Tags

NGSS.MS-PS1-1

When two or more elements chemically combine

• element
• compound
• mixture
• solution

Tags

NGSS.MS-PS1-1

the basic structural unit of matter

• atom

• matter

• element

• nucleus

Tags

NGSS.MS-PS1-1

a collection of atoms of one type that cannot be broken down into simpler substances by ordinary chemical or physical means

• element

• subatomic particle

• electron

• matter

Tags

NGSS.HS-PS1-1

the positively charged subatomic particle contained in the nucleus of an atom

• proton

• neutron

• electron

• matter

Tags

NGSS.HS-PS1-8