environmental science chemistry

Salt water boils and the water completely evaporates, salt (NaCl) is left in the bottom of the beaker. Which of the following is left in the beaker?

• Compound
• Element
• Mixture
• None of the Above

Tags

NGSS.MS-PS1-4

What cannot be broken down into other substances?

• Compound
• Mixture
• Solids
• Element

What is made up two or more elements that are chemically combined?

• Element
• Mixture
• Compound
• Solids

Tags

NGSS.MS-PS1-1

Which of the following an element?

• Carbonic Acid
• Copper
• Iron and Copper
• Water

Is sugar (C₁₂H₂₂O₁₁) an element or a compound?

• Element
• Compound

Tags

NGSS.MS-PS1-1

Is water an element or a compound?

• Element
• Compound

Tags

NGSS.MS-PS1-1

Element is a

• pure substance
• compound
• mixture
• molecule

all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

Tags

NGSS.MS-PS1-1

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

Tags

NGSS.MS-PS1-1

The central region of an atom where its neutrons and protons are is called the

• nucleus 
• electron cloud
• core 
• center