Very Much Vocabulary!
Define the word energy.
A. The power that makes machines and living things move without needing fuel
B. The heat or light that only comes from the Sun
C. The feeling you get after drinking a lot of sugar
D. The ability to do work or cause change
What is ... D. The ability to do work or cause change.
In a laboratory, Selina added five drops of hydrochloric acid to a container with sodium bicarbonate (baking soda).
Which observation helps her determine whether a chemical change has taken place?
A. formation of bubbles
B. formation of a mixture
C. change in the color of the sodium bicarbonate
D. change in the shape of the sodium bicarbonate
What is ... A. formation of bubbles
What is the definition of a molecule?
What is ... the smallest unit of a substance, consisting of two or more atoms bonded together.
Which describes the periodic table?
A calendar that shows when chemical reactions happen
B. A list of chemicals you can mix in the lab
C. A table you sit at while doing chemistry experiments
D. a chart that organizes all known chemical elements, arranging them by their atomic number (the number of protons) in rows called periods and columns called groups.
What is ... D. a chart that organizes all known chemical elements, arranging them by their atomic number (the number of protons) in rows called periods and columns called groups.
What is the definition of matter?
A. Things that only exist in science books
B. Stuff that you can see but not touch
C. Any substance that has mass and takes up space.
D. Energy that makes things move
What is ... any substance that has mass and takes up space.
What is a claim?
A. a one-sentence statement that answers a question or takes a stance on an issue, and it should be arguable
B. A guess you make before doing an experiment
B. The evidence you collect during a lab
C. Something you say just to win an argument
What is ... a one-sentence statement that answers a question or takes a stance on an issue, and it should be arguable.
What happens to the atoms in a chemical reaction?
A. They are destroyed.
B. They are rearranged.
C. They turn into energy.
D. They change into atoms of different elements.
What is ... B. They are rearranged.
Which of the following represents a molecule?
A. Ca
B. Co
C. CO
D. Cu
What is ... C. CO
The letter "H" represents which element on the periodic table?
What is Hydrogen?
What happens when an ice cube melts in a beaker of water?
A. The temperature of the water did not change.
B. The water cools down and changes to a new substance.
C. A physical change occurs because the ice changes from a solid to a liquid.
D. A chemical change occurs because the ice changes from a solid to a liquid.
What is ... C. A physical change occurs because the ice changes from a solid to a liquid.
What is a chemical reaction?
A. When you mix things together but they stay the same, like sand and water
B. When chemicals argue and get mad at each other.
C. is a process where substances (reactants) combine or change to form new substances (products) with different properties
D. When something just changes shape or size without changing what it’s made of. (a physical change, not a chemical one)
What is ... is a process where substances (reactants) combine or change to form new substances (products) with different properties.
Lab partners follow the instructions during their chemistry investigation very carefully. They measure 200 mL of a clear liquid into a beaker. Then they measure 50 mL of a different clear liquid into a graduated cylinder. They pour the liquid from the graduated cylinder into the beaker. It forms a bubbly effect in the beaker.
Which should the partners conclude about the two liquids?
A. Both liquids cooled when they were mixed.
B. Filtering would make it possible to separate the liquids.
C. A chemical reaction occurred when the liquids were mixed.
D. A new substance with the same properties as the original liquids formed.
What is ... C. A chemical reaction occurred when the liquids were mixed.
Salt and sugar appear similar, but their crystals look different at the atomic level. What does this say about the molecular structures of salt and sugar?
A. Salt and sugar molecules contain the same atoms arranged in different patterns.
B. Salt and sugar molecules contain different atoms arranged in different patterns.
C. Salt and sugar molecules are made of different atoms arranged in the same pattern.
D. Salt and sugar molecules are made of the same atoms arranged in the same patterns.
What is ... B. Salt and sugar molecules contain different atoms arranged in different patterns.
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A student measured the mass of a candle before and after burning and found the mass to be lower after burning than before. How can this be best explained?
A. Some of the candle wax was converted into light energy.
B. The law of conservation of mass does not apply to burning candles.
C. The masses were the same but the student did not measure accurately.
D. Some of the products were gases which escaped and were not measured.
What is ... D. Some of the products were gases which escaped and were not measured.
This element is the simplest and lightest element in the universe, a colorless, odorless gas and was used to fill the Hindenburg.
What is ... Hydrogen.
What is rust?
A. Dirt that sticks to metal over time.
B. a reddish- or yellowish-brown flaky coating of iron oxide that is formed on iron or steel
C. A type of paint you put on metal to make it shiny.
C. The color metal turns when it gets really cold.
What is ... a reddish- or yellowish-brown flaky coating of iron oxide that is formed on iron or steel.
Table sugar, or sucrose, is made of carbon, hydrogen, and oxygen atoms. In nature, carbon is often a black solid, and hydrogen and oxygen are colorless gases. Why does sugar look different than the elements from which it is made?
A. Elements are always gases. Molecules are always solids.
B. Light reacts differently to molecules than it does to elements.
C. The properties of molecules are different from the elements they are made from.
D. The properties of molecules are highly similar to the elements they are made from.
What is ... C. The properties of molecules are different from the elements they are made from.
Juan is reading the information that came with new medicine he has to take. One of the ingredients is lactose (C12H22O11). What can Juan conclude about lactose based on the formula?
A. Some people may be allergic to lactose.
B. Lactose is a key ingredient in many medicines.
C. A lactose molecule contains 12 atoms of carbon.
D. A lactose molecule contains 45 atoms of carbon.
What is ... C. A lactose molecule contains 12 atoms of carbon.
Name the 3 states of matter.
What is ... Solid, Liquid, and Gas.
Define independent variable and dependent variable.
Bonus 500 points if you can give an example of an experiment using a Independent and Dependent Variable.
What is ...
Independent Variable- the factor you change or control in a scientific experiment to see what effect it has
Dependent Variable- what you measure in an experiment, and it changes based on what you are testing.
Bonus 500: If you came up with a valid example!
A student sees the following safety symbols associated with an investigation:
* Heat Hazard
* Insulated gloves
* Safety Goggles
The assignment instructions indicate that a chemical reaction will occur when the student combines two clear non-toxic liquids that are at room temperature.
Based on the safety symbols shown above, what evidence of a chemical reaction will the student likely observe?
A. The liquids will change color.
B. The liquids will turn into solids.
C. The liquids will release toxic gas.
D. The liquids will generate thermal energy.
What is ... D. The liquids will generate thermal energy.
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Hydrogen (H) and oxygen (O) are pure substances. Each is made of only one type of atom, but hydrogen atoms are different from oxygen atoms. Hydrogen and oxygen chemically combine to form water (H2O).
Based on this information, which statement is true?
A. Hydrogen, oxygen, and water are all elements.
B. Hydrogen, oxygen and water are all molecules.
C. Hydrogen and oxygen are elements, and water is a molecule.
D. Hydrogen is an element and oxygen and water are molecules.
What is ... C. Hydrogen and oxygen are elements, and water is a molecule.
A scientist melted 25 grams of solid gold to form liquid gold. Which statement best describes the mass of the liquid gold?
A. 25 grams because the liquid will take up the same volume as the solid.
B. 25 grams because the same number of atoms will be present in the liquid and solid.
C. Slightly less than 25 grams because the density of the liquid will be less than the density of the solid.
D. Slightly more than 25 grams because the kinetic energy of the atoms will be greater in the liquid than in the solid.
What is ... B. 25 grams because the same number of atoms will be present in the liquid and solid.