Chemistry Cba Review

Which elements are found in all 4 components of Earth's spheres?

• Hydrogen and Oxygen

• Carbon and Silicon

• Sodium and Calcium

• Oxygen and Iron

On the periodic table, Na would be an elements

• formula

• symbol

• name

• compound

What is an element?

• substance that cannot be broken down into simpler substances

• naturally occurring mineral made of more than one substance

• small particle made with a specific chemical composition

• collection of atoms that have abilities when joined together

This element is the most abundant in Earth's biosphere.

• Nitrogen

• Oxygen

• Carbon

• Hydrogen

The second most abundant element in Earth's hydrosphere is

• Oxygen

• Hydrogen

• Helium

• Nitrogen

Tags

NGSS.MS-PS1-1

Which of the following is an example of a compound?

• O₂

• NaCl

• H₂

• Co

Tags

NGSS.MS-PS1-1

Which of the following is an example of an element?

• SO₄

• H₂O

• O₂

• NaCl

If the key has a mass of 21g, what is its density?

• 18g/mL

• 7g/mL

• 24g/mL

• 63g/mL

What is the formula for density?

• Density = Mass / Volume

• Density = Volume / MassThis is a wrong answer

• Density = Mass * Volume

• Density = Volume * Mass

How many elements are in the formula

CH₄ + O₂ ----> CO₂ + H₂O

• 7

• 5

• 3

• 1