Matter, Mixtures, & Solutions

A teacher mixes a white powder into a beaker of water.  The powder cannot be seen in the water.  The teacher then heats the mixture until the water evaporates and the powder can be seen again.  Which property of the powder is the teacher demonstrating?

• Solubility
• Density
• Conductivity
• Mass

A student is measuring the solubility of a substance.  The student needs to boil the water in order to test the substance's ability to dissolve.  The temperature of water  is 53°C.  How many more degrees Celsius must the temperature rise before it reaches the boiling point of water?

• 159°
• 47°
• 100°
• 212°

A mixture of beads was placed in a container.  The beads are various sizes, and each one is made of plastic, glass, or steel.  The mixture would be easy to separate because all the beads - 

• float.
• are solids.
• have the same mass.
• are attracted to a magnet.

A student observes ice forming on the edge of a school building.  At what temperature did the water outside the school building most likely begin to change to ice?

• 100°C
• 32°C
• 25°C
• 0°C

When a powdered drink mix was added to water, the liquid turned orange.  A student decided that the taste was too strong, so he poured out half the liquid and added more water.  Which of the following most likely occurred when more water was added?

• The physical state changed.
• The orange color became lighter.
• The liquid had a sweeter taste.
• None of answers are correct.

A student made a mixture using equal amounts of salt and pepper.  The salt grains were the same size as the pepper grains.  What should the student do to most easily separate the pepper from the salt?

• Use a pair of tweezers to remove each grain of pepper.
• Run a small magnet through the mixture to attract the pepper.
• Put the mixture in water and filter the pepper out of the water.
• Use a strainer with a fine wire screen to remove the pepper.

A student adds 10 grams of four different powdered solids into four different beakers.  The student then adds 100 mL of water to each beaker, stirs the mixtures, and allows them to sit for half an hour before recording observations.  Which question is the student most likely trying to answer with the investigation?

• At what temperature do the substances dissolve?
• How much water is needed to cause a substance to change state?
• What causes a substance to sink when put in water?
• Which substances dissolve in water?

Some people add sugar to their hot tea.  Which property of the sugar remains the same when the sugar is in the tea solution?

• The taste of the sugar
• The size of the sugar crystals
• The color of the sugar
• The texture of the sugar

Which of these is NOT soluble in water?

• Oil
• Salt
• Honey
• Sugar

The table shows some properties of four different samples of matter.  Which two samples could be glass and saltwater?

• 1 & 2
• 3 & 4
• 1 & 3
• 2 & 3