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SS2 Post Test

QuestionAnswer
A student wanted to test the hypothesis that adding antifreeze to water lowers the freezing point of water. The student found that water froze at 0C, while the water/antifreeze mixture froze at -20C. What was the dependent variable in this experiment? The freezing point of the substance
A box is 3 cm wide, 2 cm long and 4 cm tall. It's mass is 12 g. what is its density? D=M/V 0.5 grams per centimeter cubed
According to the particle theory of matter, the particles in a solid are Vibrating but still held in place
Which of the following are the properties of most acids? pH 0-6 and sour taste
After fishing in the ocean, a student left his fishing gear in the sun to dry and small white crystals formed on the rod, reel, and fishing line. Why did this happen? The water evaporated from the fishing gear and the salt from the ocean was left behind
What is an example of an element? Iron
According to this equation, what happened to the carbon and oxygen? C+O2->CO2 They combined chemically to form a new compound
Which of these best describes the particle motion taking place as carbon dioxide gas is exposed to freezing temperatures? The particles decrease in speed
John and Emily were experimenting with the effects of road salt on plant growth. To do this they watered plants daily with the same amount of salt water. They could best improve their experiment by -- Watering half the plants with pure water and half the plants with salt water
Which of the following is true about exothermic reactions? They release heat energy
What process is an example of a physical change? Melting ice
The dense, positively charged center of an atom is called the _____. Nucleus
The atom is composed of electrons, protons, and neutrons. What is the electric charge on the electron? -1
The area surrounding the nucleus where the electrons are found is known as the _____. Electron cloud
(use a Periodic Table to answer this question) Which element has 3 protons? Lithium (Li)
What characteristic is used to identify different elements? Its number of protons
Where are metals located on the periodic table? To the left of the metalloids
How do we determine what elements have similar properties? Elements in the same group (column) have similar properties
What elements do not react with other elements? The Noble Gases (group 18)
What is an example of an endothermic reaction? Melting an ice cube
What needs to be placed into the blank to make this a balanced chemical equation? CH4 + 2O2 -> 2H2O + _____ CO2
What is an example of a chemical change? Vinegar bubbling when added to baking soda
What type of energy conversion is taking place when a skateboarder goes from the top of a ramp to the bottom of a ramp? Potential energy to kinetic energy
Energy conversions are never completely efficient because some of the energy is always lost to the environment in the form of _____. Heat (friction)
Absolute zero is the temperature at which... All molecular motion stops
The space between the Earth and the Sun is mostly a vacuum where there is no matter. How then does the Sun transfer thermal energy to the Earth? Radiation
Thermometers usually use mercury or alcohol to measure temperature. Why does the liquid inside the thermometer move when the temperature changes? The liquid expands as the temperature rises
Students conducted an investigation to determine if unknown liquids were acids or bases. They placed litmus paper in various substances and recorded the change in color. What was the independent variable in this investigation? The sample
During an experiment, you measure the mass of an unknown substance as 22.4 g and its volume as 3.14 centimeter cubed. What is the density of the substance? (density= mass/volume) 7.13
A student measures the temperature of water heating on a stove every minute. What is the independent variable in this experiment? Heating time
Created by: smorrow801
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