unit 3 and 4 review

The following graph represents the amount of sugar that dissolves in 100 g of water at different temperatures.

Which of these is the best prediction of the greatest amount of sugar that will dissolve in 300 g of 30 °C water?

• 70 g

• 220 g

• 660g

• 1320 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

The following graph represents the amount of sugar that dissolves in 100 g of water at different temperatures.

Which of these is the best prediction of the greatest amount of sugar that will dissolve in 100 g of 30 °C water?

• 70 g

• 220 g

• 660g

• 1320 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

The following graph represents the amount of sugar that dissolves in 100 g of water at different temperatures.

Which of these is the best prediction of the greatest amount of sugar that will dissolve in 100 g of 20 °C water?

• 170 g

• 220 g

• 660g

• 1320 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Distilled water —

• does not conduct an electric current

• freezes at 32 C

• boils at 100 F

• contains solute molecules

1 Fast neutron therapy is used in modern medicine to treat cancer that is resistant to other methods of treatment. To produce the neutrons needed for fast neutron therapy, a stream of protons is accelerated towards a mass of beryllium. This causes the beryllium atoms to release neutrons from their nuclei.

The methods used to perform fast neutron therapy are an example of which type of reaction?

• Synthesis

• fusion

• decomposition

• fission

Tags

NGSS.HS-PS1-8

Fission reactions

• put smaller atoms together to make larger atoms

• break larger atoms apart to make smaller atoms

• do not involve atoms

• make water polar

Tags

NGSS.HS-PS1-8

1 Why is nuclear fisson used instead of fusion in nuclear reactors?

• Fisson produces more energy per unit mass.

• Fisson produce less hazardous by-products.

• Fisson is easier to regulate and control.

• Fisson requires less expensive fuel.

  
  

Tags

NGSS.HS-PS1-8

1 When 2.2 grams of NaCl are poured into a solution of salt, the NaCl dissolves. What can be determined about the original solution from this observation?

• The solution was saturated

• The solution was hypersaturated

• The solution was supersaturated.

• The solution was unsaturated.

According to the chart shown above, if the saturated solution of glucose at 80°C was suddenly cooled to 40°C, what would happen?

• An additional 300 grams of glucose could dissolve.

• The solution would spontaneously cool to 200°C.

• The solution becomes supersaturated.

• Nothing special would happen, the increased temperature just made the dissolving process quicker.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Water is often referred to as the universal solvent. What structural factor makes water an effective solvent?

• the prescence of hydrogen

• its lack of covalent bonds

• the polar nature of its molecules

• its abundance on the Earth's surface

Tags

NGSS.MS-PS1-1