questions
questions
definitions
definitions
nj ask practice
100
Is ice a physical or chemical change.
What is a compound occurs when two or more atoms combine to make a new substance?
100
What four elements have chemical properties most similar to those of flourine in column VII A?
What is chlorine, bromine, iodine, asfatine?
100
The smallest particle of an element.
What is an atom?
100
The relative amount of a material in a given area, volume, or other substance.
What is concentration?
100
which of the following is a property of a nonmetal?
What is its a good conductor of heat and electricity?
200
What is the chemical formula of hydrogen peroxide.
What is each unit of a compound is called a molecule?
200
Name two metals other than lithium that probably tarnish quickly in air?
What is sodium and berylium?
200
The number of protons in an atom's nucleus.
What is an atomic number?
200
a substance that cannot be broken down by simple chemical and physical processes.
What is element?
200
which element is least likely to combine with another element to form a molecule?
What is silicon- a metalloid?
300
How many hydrogen and carbon atoms are in a moleculeof propane?
What is three atoms for carbon and eight for hydrogen?
300
Name two elements other than chlorine that are likely to form molecules with sodium?
What is potassium and flourine and rabidium?
300
a reaction between substances that results in new substances with different chemical properties being formed.
What is chemical change?
300
a type of chemical change that absorbs heat energy from the surroundings.
What is endothermic?
300
which could be amounts of x and y in the reaction?
What is 300 g of x and 600 g of y?
400
How many hydrogen and oxygen atoms exist before the reaction?
What is eight hydrogen and four oxygen?
400
Are lithium and flourine a metal or nonmetal?
What is lithium is a metal and flourine is a nonmetal?
400
Letters and numbers that tel the types and numbers of atoms in a single molecule.
What is a chemical formula?
400
a type of chemical change that releases heat energy to the surroundings?
What is exothermic?
400
which of the following is an example of a chemical change?
What is an iron bridge rusting over years?
500
How many hydrogen and oxygen atoms exist after the reaction?
What is 8 hydrogen and 4 oxygen?
500
Explain why the difference in odors tells you that ammonia in water is a mixture?
What is chlorine is a nonmetal?
500
The characteristics of a substance that describes what will happen when it interacts with other substances.
What is a chemical properties?
500
evidence that a chemical reaction is occured.
What is indication?
500
which process will best separate sand and sugar?
What is a magnet and hydrochloric acid?
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