10Chem Study Guide F3

All of the following are physical changes except:

• Cl2(g) → 2Cl-(g)

• NaCl(s) → NaCl(aq)

• Br2(g) → Br2(l)

• NaOH(s) → NaOH(aq)

When forming ice cubes, people put water trays in the freezer to solidify. How does the molecules in the ice compare to the molecules in the liquid water?

• The molecules are larger as a liquid than they are as a solid.

• The molecules weigh less as a liquid than they do as a solid.

• The molecules move faster as a liquid than they do as a solid.

• The molecules move at the same speed as a solid and liquid.

Tags

NGSS.MS-PS1-4

Which of the following best describes a physical change?

• Bonds are broken while other bonds are forms to form new molecules

• New substance are created

• No bonds are broken or formed

• Only can occur in compounds, not elements

Tags

NGSS.MS-PS1-4

Which of the following are NOT pure substances

• I and II

• II and III

• III and IV

• II only

Tags

NGSS.HS-PS1-3

In the reaction, N2 + 3H2 → 2NH3, 24 grams of NH3 are produced and 15g of N2 were consumed. According to the law of conservation of mass, how many grams of H2 were also consumed?

• 39g

• 9g

• 15g

• 45 g

Tags

NGSS.HS-PS1-7

Which of the following is the correct balanced chemical equation?

• 2CH₄ + 3O₂ → 2CO₂ + 4H₂O

• 2CH₄ + 3O₂ → 2CO₂ + 4H₂O

• 3CH₄ + 2O₂ → 3CO₂ + 4H₂O

• CH₄ + 2O₂ → CO₂ + 2H₂O

Tags

NGSS.MS-PS1-5

JJ Thompson and Rutherford both conducted experiments that guided scientists to theorize models of the atom. Which of the following are true about Thompson and Rutherford’s experiments?

• JJ Thompson learned that a positive nucleus exists whereas Rutherford learned that negative particles exist

• JJ Thompson learned that electrons orbit around the nucleus whereas Rutherford discovered that atoms had a positive nucleus

• JJ Thompson learned that atoms have negative particles whereas Rutherford learned that atoms have a positive nucleus

• JJ Thompson learned that atoms have negative particles whereas Rutherford learned that atoms have neutrons in the nucleus

How did Rutherford’s experiment, the Gold Foil Experiment, work?

• A beam of particles was deflected towards a positive cathode

• A beam of particles was deflected towards a negative cathode

• A beam of particles passed completely through a piece of gold foil

• A beam of particles mostly passed through a piece of gold foil, while some were deflected

How did Thompson’s experiment, the Cathode Ray Tube, work?

• A beam of particles was deflected towards a positive cathode

• A beam of particles was deflected towards a negative cathode

• A beam of particles passed completely through a piece of gold foil

• A beam of particles mostly passed through a piece of gold foil, while some were deflected

Tags

NGSS.HS-PS4-3

Which of the following isotopes of chlorine is least abundant?

• Cl-35 35.14 55%

• Cl-36 36.09 6%

• Cl-37 36.97 35%

• Cl-38 37.98 4%