Mid Unit Assessment Chapter 5 Physical Science

When Alex adds sugar to his morning tea, the sugar is considered the

• Solute

• Solvent

• Solution

• Supernate

During a science experiment, Shamaria, Garrett, Kingston, Ruthie, and Emily were given four substances: sand, sugar, salt, and baking soda. Which substance did they find to be insoluble in water?

• sand

• sugar

• salt

• baking soda

During a science experiment, Alex and Ruthie were discussing about solutions. They made the following statements. Which of these statements is NOT correct?

• Alex said: 'In covalent solutions, like when sugar is dissolved in water, the water breaks up the sugar clumps into molecules which float in a distributed manner.'

• Ruthie said: 'In ionic solutions, like when salt is dissolved in water, the water breaks up the salt into individual atoms/ions.'

• Ashton, who was listening to them, said: 'Water being polar, only likes to dissolve other polar substances.'

• Kingston, another student, said: 'The properties of gasses and solids prevent them from becoming solutions.'

During a science experiment, Hunter, Thomas, Corbyn, Emily, and Ashton were trying to dissolve sugar cubes in water. Which of the following actions by Emily would NOT increase the rate at which her sugar cube dissolves?

• Emily stirs the solution.

• Emily crushes her sugar cube.

• Emily heats the water.

• Emily reduces the amount of water.

During a science experiment, Chelsea, Lizbeth, and Alex were testing the solubility of different substances in water at varying temperatures. They noticed that all substances increased in solubility as the temperature increased, except for one. Which substance did not increase in solubility as the temperature increased, potentially posing a risk to aquatic life?

• C₂H4O2 (sugar)

• NaCl (salt)

• K₂Cr₂O7 (potassium dichromate)

• O2 (oxygen gas)

Kingston, Jager, Garrett, Lizbeth, and Cordelle were working on a science project. They had a mixture of different colored dyes and they needed to separate them. Which of the following scientific techniques should they use to separate the solution due to the homogenous nature of the substances involved?

• Chromatography which uses a solvent to carry molecules of different size and speed.

• Combustion which uses fire to burn the solute.

• Filtration which uses filter paper to physically separate parts of a mixture such as sand and salt.

• Spectrometer which measures the concentration of molecules in a substance.

Thomas was making a cup of hot chocolate. He kept adding chocolate powder until no more could dissolve at that temperature. What is this type of solution called?

• saturated

• unsaturated

• supersaturated

• diluted

In a science experiment, Thomas and Hunter are trying to dissolve substance B in water. How much of substance B would they need to add to reach saturation at 20°C?

• 30g

• 20g

• 90g

• 50g

Shamaria and Lizbeth were conducting a science experiment. They added 20g of sugar (Solute D) into 100g of water at 50°C. What would you call the state of the solution they created?

• Supersaturated

• Unsaturated

• Insoluble

• Immiscible

Shamaria made a lemonade and it reached saturation. She then heated the lemonade and added more sugar. After cooling it down, she added a single sugar crystal to the lemonade and noticed that sugar crystals started to form at the bottom of the jar. What would this type of solution be called?

• Supersaturated

• Unsaturated

• Insoluble

• Immiscible