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100
KABOOM!
Loose 100 pnts
100
Why is the metric system important?
It is based on the number 10 and it is used by scientists all over the world.
100
The formula for aluminum oxide is Al2O3. How many aluminum atoms are in one molecule of aluminum oxide?
2
100
Why will ice float on top of liquid water?
Because it is less dense than water
100
In what order are the regions arranged on the periodic table when you read it from left to right?
Metals, Metalloids, NonMetals
200
What is the smallest unit of an element that still has properties of that element?
atom
200
Which of the following is the chemical formula for an element and how can you tell a. H2O b. NaCl c. Cl2 d. NH3
Cl2 because there is only one capital letter.
200
What happens to particles in a substance at higher temperatures?
Particles increase in energy and move faster
200
Which of the following is an example of a chemical reaction or chemical change? A. Water evaporating from a pot on a hot stove B. Sand being removed from sea water by filtration C. A spoonful of sugar dissolving in a glass of water D. A white solid forming when two clear liquids are poured together
D
200
Which of the following statements about a group of elements is true? A. Atoms of the elements have the same number of neutrons. B. Atoms of the elements have the same atomic number. C. The elements have similar properties. D. The elements have the same average atomic mass.
C
300
Which 2 properties would be most useful in classifying substances into the states of matter?
shape and volume
300
What are the three chemical properties of matter?
Combustibility Flammability Reactivity
300
If you poured three liquids (that do not mix completely) into a beaker, how could you tell which one is the densest liquid?
The liquid that settles to the bottom is the densest liquid
300
Which of the following is an example of a chemical change? A. water freezing into ice B. ice melting into water C. meat spoiling and changing color D. butter softening into a liquid
C
300
A student has two different liquids in open jars. She pours the liquid from one jar into the other jar, and she observes bubbles. After the bubbling stops, she finds that the total weight of the liquids is now less than the total weight of the liquids before they were mixed together. How can her observation be explained?
Some atoms went into the air because the system was open
400
KABOOOOM!
lose 400 points
400
KABOOOOM!
loose 400 pnts
400
KABOOOOM!
loose 400 pnts
400
The mass number of an element is the total number of protons and neutrons located in the nucleus. If carbon has an atomic number of 6 and a mass number of 12, how many neutrons does it contain?
6
400
What is the purpose of the zigzag line on the right side of the periodic table?
It divides the metals and nonmetals and shows where the metalloids are.
500
An oxygen atom has 8 protons, 8 neutrons and 8 electrons. If the oxygen atom gains two electrons to form a new type of atom called an ion. What will be the charge of the atom if it gains 2 electrons?
-2
500
When chlorine gas chemically reacts with sodium, what is formed? a. mixture b. compound c. element d. solution
B. Compound...because it says chemically reacts
500
Substance Mass Boiling pt. Density (g) (°C) (g/cm3) A 20 40 20 B 1,000 100 35 C 1,000 40 100 D 1,000 40 20 Which 2 substances are most likely the same?
A and D because their densities and boiling points are the same.
500
Alberto has an element that is a shiny, solid that conducts electric current. The element most likely belongs to which class of elements?
metals
500
Two white powders were mixed together. A chemical reaction occurred, and a yellow powder was formed. What is the relationship between the yellow powder and the white powders? A. The yellow powder is made up of the same kinds of atoms as the white powders, but the atoms are combined into different molecules. B. The yellow powder is made up of the same kinds of molecules as the white powders, but the molecules are a different color. C. The yellow powder was released from inside the atoms of the white powders. D. There is no relationship between the yellow powder and white powders.
A. The yellow powder is made up of the same kinds of atoms as the white powders, but the atoms are combined into different molecules.
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