Physical Changes
Matter
Periodic Table
Elements & Mixtures
Practice Questions
100
Is ice melting a physical or chemical change? Explain.
A physical change because it can be reversed.
100
A fuel is burned in an airplane and it seems to disappear from the tank, suggesting matter is destroyed. Why is this not true and where does it go?
Matter is neither created or destroyed in chemical reactions. The fuel is converted into gas, which escapes into the atmosphere.
100
According to the periodic table on page 99, what four elements have chemical properties most similar to those of Fluorine, in column VII A?
Chlorine, Bromine, Iodine, & Astatine
100
Use a periodic table to predict which two metals other than Lithium (Li) probably tarnish quickly in the air.
Sodium (Na) and Potassium (K)
100
What is a property of Florine (F), a nonmetal?
It is a gas at room temperature and pressure.
200
When you eat a chemical reaction takes place in your stomach. What is a reactant in the reaction?
Food eaten, saliva, stomach acids
200
A molecule of hydrogen peroxide has one more oxygen atom than a molecules of water. What is the chemical formula of hydrogen peroxide?
^ means subscript H^2O^2 subscripts tell you the number of atoms in a molecule
200
On a periodic table, what element goes with the following chemical symbol, Ag? Is it a metal, metalloid, or nonmetal?
Silver, metal
200
Name two elements other than Chlorine (Cl) that are likely to form molecules with sodium (Na).
Lithium (Li) and Florine (F) produce salt Iodine (I) and Rubidium (Rb) produce salt
200
Which of the following elements on question 3, page 106, is least likely to combine with another element to form a molecule?
Answer choice B, Iron (Fe), a metal
300
When you eat a chemical reaction takes place in your stomach. What is a product in this reaction?
Anything your body produces from the food.
300
Propane has the chemical formula C^3H^8. How many hydrogen and carbon atoms are in a molecule.
8 hydrogen 3 carbon
300
On a periodic table, what element goes with the following chemical symbol, P? Is it a metal, metalloid, or nonmetal?
Phosphorus, nonmetal
300
According to page 102, describe a process to separate the parts of mixture A.
Use a colander and pour contents in. Water drains out and the marbles are left.
300
Which of the answer choices on question 5, page 106, is an example of a chemical change?
Answer choice D, an iron bridge turning brownish-red over the years
400
Most first aid kits have chemical filled packets that when squeezed, grow very cold.Is it an endothermic or endothermic reaction?
endothermic, because it absorbs heat. The pack pulls heat energy from your body and feels cold.
400
According to the picture on page 98, how many hydrogen and oxygen atom exist before the reaction?
8 hydrogen 4 oxygen
400
On a periodic table, what element goes with the following chemical symbol, Li? Is it a metal, metalloid, or nonmetal?
Lithium, metal
400
According to page 102, describe a process to separate the parts of mixture B.
Drain the water out. Use the magnet to take out the iron fillings.
400
Which of the answer choices on question 6, page 107, will best separate a mixture of sand and sugar?
Answer choice A, filter paper, water, and beakers
500
What is the difference between an endothermic and exothermic reaction?
Endothermic reaction absorbs heat. Exothermic reaction produces heat.
500
According to the picture on page 98, how many hydrogen and oxygen atom exist after the reaction?
8 hydrogen 4 oxygen
500
On a periodic table, what element goes with the following chemical symbol, Te? Is it a metal, metalloid, or nonmetal?
Tellurium, metalloid
500
According to page 102, describe a process to separate the parts of mixture C.
Drain the water. Use a magnet to take out the iron marbles. Evaporate the water.
500
Using the answer choices on question 7, page 107, what is the chemical formula of methane that contains five carbon atoms and 20 hydrogen atoms?
Answer choice D
M
e
n
u