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WARNING: Goggles and Aprongs Must Be Worn at ALL Times. This sign was found at the entrance of a chemistry laboratory. It is an important sign because _____.
12
CaCl2
Ammonia is a base, and vinegar is an acid.
Waves bounce off when they strike an object.
230 g
protons, neutrons
the solar system
chemicals can seriously damage eyes and skin
Police can detect speeding motorists with a radar gun. What property of waves enables them to do this?
12
CaCl2
Ammonia is a base, and vinegar is an acid.
Waves bounce off when they strike an object.
230 g
protons, neutrons
the solar system
chemicals can seriously damage eyes and skin
Which atomic particles will you find inside of the nucleus of an atom?
12
CaCl2
Ammonia is a base, and vinegar is an acid.
Waves bounce off when they strike an object.
230 g
protons, neutrons
the solar system
chemicals can seriously damage eyes and skin
Which of the following correctly converts 0.23 kilograms (kg) into grams (g)?
12
CaCl2
Ammonia is a base, and vinegar is an acid.
Waves bounce off when they strike an object.
230 g
protons, neutrons
the solar system
chemicals can seriously damage eyes and skin
Angie is testing whether ammonia and vinegar are acids or bases. Litmus paper helps determine whether a chemical is an acid or a base. A drop of ammonia turns the litmus paper blue, and a drop of vinegar turns the litmus paper red. What can Angie
12
CaCl2
Ammonia is a base, and vinegar is an acid.
Waves bounce off when they strike an object.
230 g
protons, neutrons
the solar system
chemicals can seriously damage eyes and skin
Which of the following is the structure of an atom most like?
12
CaCl2
Ammonia is a base, and vinegar is an acid.
Waves bounce off when they strike an object.
230 g
protons, neutrons
the solar system
chemicals can seriously damage eyes and skin
The chemical formula for a compound that has one Calcium atom and 2 Chlroine atoms is _______.
12
CaCl2
Ammonia is a base, and vinegar is an acid.
Waves bounce off when they strike an object.
230 g
protons, neutrons
the solar system
chemicals can seriously damage eyes and skin
If an element has an atomic number of 12, how many electrons does it have?
12
CaCl2
Ammonia is a base, and vinegar is an acid.
Waves bounce off when they strike an object.
230 g
protons, neutrons
the solar system
chemicals can seriously damage eyes and skin
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