Semester 1 Round Up

Compounds are pure substances. What other chemicals are considered pure substances?

• Mixtures
• Solutions
• Elements

Which of the following is not an element?

• Helium
• Nitrogen
• Water 
• Sodium

The chemical symbol Ca represents.....

• Calcium
• Carbon
• Chlorine

Which of the following correctly lists an advantage of using natural gas?

• Natural gas is a fossil fuel.
• Natural gas is nonrenewable.
• Natural gas releases sulfur and carbon dioxide into the air.
• Natural gas can be used to heat homes and power some cars.

Which of the following energy resources would be the most environmentally friendly way to add to the electrical power system?

• Hydroelectric power from a school pond
• Solar panels on the roof
• Diesel powered generator outside the building

The use of which of the following resources would be most affected by changes in weather?

• Wind
• Geothermal
• Natural Gas

When a hawk eats a mouse and then uses the energy from the mouse to fly, thehawk’s body converts —

• mechanical energy to chemical energy
• thermal energy to mechanical energy
• chemical energy to mechanical energy

What type of heat transfer occurs when you touch a metal seat with your hand and the seat feels cold?

• Conduction
• Radiation
• Convection

A student wanted to conduct a series of tests to identify minerals.  Which list below shows the tests that the student should conduct on each of the minerals?

• hardness, color, luster, streak
• color, taste, shape, size
• streak, size, taste, shape

During a science class experiment, a teacher places a small amount of sugar in a spoon and heats it over a candle. Which of the following would be the BEST evidence that a change in the chemical properties of the sugar has taken place?

• The sugar gets black.
• The sugar gets hotter.
• The sugar turns into a colorless liquid.