SS CH 12

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.

• is the simplest whole-number ratio of moles of elements in the compound.

Tags

NGSS.MS-PS1-5

C₂H₄ What is the empirical formula?

• CH

• CH₂

• C₄H₂

• C₂H₄

Tags

NGSS.MS-PS1-1

Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine.

• CrCl

• CrCl₃

• Cr₃Cl

• Cr₂Cl₆

Tags

NGSS.MS-PS1-1

Tags

NGSS.MS-PS1-1

Which of the following is a characteristic of a covalent bond?

• Transfer of electrons

• Sharing of electrons

• Formation of ions

• High melting point

Tags

NGSS.HS-PS1-1

What is the main function of chlorophyll in plants?

• Absorb water

• Absorb sunlight

• Absorb nutrients

• Absorb carbon dioxide

Tags

NGSS.MS-LS1-6

Which of the following elements is a noble gas?

• Oxygen

• Nitrogen

• Helium

• Hydrogen

What is the pH of a neutral solution at 25°C?

• 0

• 7

• 14

• 7.5

Which of the following is an example of a physical change?

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

Tags

NGSS.MS-PS1-4

What is the primary gas found in Earth's atmosphere?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Hydrogen