What is ice melting is a physical change because you can change it back.
100
Propane has the chemical formula C3H8. How many carbon and hydrogen atoms are in the molecule of propane.
What is there are 8 hydrogen atoms and 3 carbon atoms
100
According to the periodic table on page 99, what elements symbol is P. Is it a metal, non metal, or metalloid.
What is phosphorus. It is a non metal.
100
Name two other elements other than chlorine that are likely to form molecules with sodium.
What is fluorine and lithium produce salt, iodine, and rubidium.
100
Which element is least likely to combine with another element to form a molecule?
What is C, neon and noble gas
200
When you eat food, a chemical reaction takes place in your stomach. Identify the reactants in this reaction.
What is the reactants are the saliva in your mouth and stomach acids.
200
According to the picture on page 98, how many oxygen and hydrogen atoms exist before the reaction.
What is 8 hydrogen atoms and 4 oxygen atoms.
200
According to the periodic table on page 99, what elements symbol is Li. Is it a metal, non metal, or metalloid.
What is , what is lithium. It is a metal.
200
Identify the names of the element in the molecule LiF.
What is lithium and fluorine
200
Which of the following is a property of fluorine, a non metal
What is B, it is a gas at room temperature and pressure.
300
Most first aid kits have chemical filled packets that, when squeezed, grow very cold. Is the chemical reaction exothermic or endothermic
What is endothermic because they absorb heat.
300
According to the picture on page 98, how many hydrogen and oxygen exist after the reaction?
What is 8 hydrogen atoms and 4 oxygen atoms.
300
According to the periodic table on page 99, what element's symbol is Te. Is it a metal, non metal , or metalloid.
What is tellurium. It is a metalloid.
300
Identify the names of the element in the molecule N2.
What is two atoms of nitrogen.
300
Which of the following is an example of a chemical change
What is D, an iron bridge turning brownish-red over the years.
400
As fuel is burned in an airplane, it seems to disappear from the tank suggesting that matter is destroyed during the reaction. Explain why this is not true, and describe where the matter goes.
Matter is neither created or destroyed in chemical reactions. The fuel is converted into gas which escaped into the atmosphere.
400
According to the periodic table on page 99, what four elements have chemical properties most similar t those of fluorine in column VII A?
What is chlorine, bromine, iodine, and astatine.
400
According to the periodic table on page 99, what elements symbol is I. is it a metal, non metal, or metalloid.
What is iodine. It is a non metal
400
Identify the names of the element in the molecule Mgl2.
What is magnesium and 2 atoms of iodine
400
Which equipment will best seperate a mixture of sand and sugar.
What is filter paper, water, and beakers
500
A molecule of hydrogen peroxide has one more oxygen atom than a molecule of water. What is the chemical formula of hydrogen peroxide.
What is the chemical formula H2O2
500
According to the periodic table on page 99, what element's symbol is Ag. Is it a metal, non metal, or metalloid?
What is silver. It is a metal.
500
Use the periodic table on page 99 to name two metals other than lithium that probably tarnish quickly in air?
What is sodium and potassium.
500
Identify the names of the element in the molecule Cl2.
What is 2 atoms of chlorine.
500
Five molecules of methane contain five carbon atoms and 20 hydrogen atoms. What is the chemical formula of methane.