Chemistry: Unit 3 Law of Conservation of Mass.

Which element has a higher electronegativity value?

• Niobium

• Tin

• Cadmium

• Iodine

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element has a lower electronegativity value?

• Calcium

• Barium

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element has the greater ionization energy?

• Strontium
• Boron

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following sequences corresponds to a correct trend in ionization energy?

• Cl > S > P > Al
• Sr > Ca > Mg > Be
• Rb > K > Na > Li
• Rb > Sr > I > Xe

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the volume of 160 g of oxygen gas at STP?

• 112 L

• 22.4 L

• 78.8 L

• 114.24 L

• 224 L

How many molecules are in 32.4 grams of phosphorous pentoxide?

• 1.76 x 10²³ molecules
• 0.29 moles
• 1.76 x 10²² molecules
• 0.29 molecules

____ reactions usually feel cold.

• endothermic

• exothermic

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NGSS.HS-PS1-4

Is this endothermic or exothermic?

• exothermic

• endothermic

Tags

NGSS.HS-PS1-4

What type of reaction is modeled?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆