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Worksheetsunit 2 test
Total questions: 19
Worksheet time: 16mins
In which state of matter would carbon-dioxide molecules most likely have the least amount of motion (kinetic energy)?
solid
liquid
gas
plasma
Which statement about a ring of pure solid gold is NOT consistent with the particle theory of matter?
The particles are all identical.
The particles have spaces between them.
The particles are not in motion since it is a solid.
The particles are held together by electric forces.
All matter is made up of small particles called –
electrons
atoms
elements
salts
Sodium chloride (NaCl) is formed in a chemical reaction between sodium (Na) and chlorine (). What is sodium chloride?
an element
a mixture
a compound
an atom
Winnie is conducting a chemistry experiment. She determines that the starting pH of a solution is 8.5. After a chemical reaction, the pH of the solution is 7.0. Which of the following best describes the change that occurred?
The solution changed from a base to an acid.
The solution changed from a base to a neutral pH.
The solution changed from an acid to a base.
The solution changed from an acid to a neutral pH.
Which of the following is an example of a compound?
copper
iron
carbon
water
Which best describes the motion of molecules in the gaseous state?
They vibrate quickly in place.
They spread apart to fill their container.
They move at the same speed as in a liquid.
They move slowly over one another.
Which physical state of water contains particles with the least motion (kinetic energy)?
ice that is melting
water vapor
ice
steam
A student mixes salt and water in a beaker to form a solution. What properties of the substances would allow the student to then separate the components?
densities
particle sizes
boiling points
electrical conductivity
A researcher exposed a metal sample to oxygen at a high pressure. The researcher records the results. Which property of the sample is the researcher most likely trying to determine?
reactivity
density
melting point
boiling point
Lucy made the following observation about gases: “Gases can be easily compressed and are able to expand to fill their containers.” Lucy’s observation describes which of the following?
changes in state
a change in color
phsical properties of matter
changes in chemical properties
A classroom thermometer reads the external temperature of the school at 40ºC. What is this temperature in Kelvin?
233.5K
273.K
313.15K
340.75K
The volume of water in the pot decreases during this investigation. Water droplets form on the mirror when positioned over the pot. In this setup, water -
vaporizes and then freezes
vaporizes then condenses
condenses and then vaporizes
freezes and then vaporizes
What will not happen when a gas is heated?
The size of the gas molecules will increase.
The particle motion of the gas molecules will increase.
The temperature of the gas will increase.
The pressure in the container that's holding the gas will increase.
When frozen CO2 (dry ice) gets warmer, what phase change occurs?
evaporation
sublimation
melting
condensation
While conducting an experiment, a student collects several different water temperatures, two mass measurements, and three volume measurements. Which of these would be the BEST way to organize the data?
in a table
in a graph
in a written narrative
illustrated with pictures
Mike conducted an investigation using three different skateboards. He wanted to see which skateboard rolled the fastest down a curved ramp. He released each skateboard at the top of the ramp once and used a stopwatch to determine the fastest skateboard.
Mike needs to make sure that all the skateboards are not affected by friction.
Mike needs to have more than one set of numbers to make an accurate graph.
Mike needs multiple trials to determine which board is the control.
Mike needs to repeat the investigation several times to improve the accuracy of his data.
Which BEST describes the benefit of having a control group in a scientific experiment?
Variables that may cause changes are eliminated.
The number of subjects needed in the experimental group is small.
Changes that may occur in the control group are easily explained.
The number of variables needed for each group are easily determined.
Based on the graph, which statement BEST compares the cost of the incandescent light bulb to the cost of the fluorescent lamp bulb?
The incandescent light bulb is more expensive to buy and to use.
The incandescent light bulb is less expensive to buy and to use.
The incandescent light bulb is more expensive to buy but less expensive to use.
The incandescent light bulb is less expensive to buy but more expensive to use.
