What is approved eye protection devices, such as goggles, worn in the laboratory.
100
Antimony and Arsenic
What is, Which two members of the nitrogen family are metalloids?
100
Its properties.
What is, From an element’s location in the periodic table, you can predict
100
Alkaline Earth Metals
What is, Which elements have two valence electrons in their atoms?
100
Physical change.
What is, A change that alters the form of a substance without changing it into another substance is called____
200
Disposed of according to your instructor’s direction.
What is after completing an experiment, all chemical waste should be
200
Metalloids
What is, Which group of elements shares characteristics with both metals and nonmetals?
200
Atomic number instead of atomic mass to organize the elements
What is, How did chemists change Mendeleev’s periodic table in the early 1900s?
200
The elements in a group
What is, Which of the following have the same number and arrangement of valence electrons?
200
Different substances with different properties.
What is, A chemical change results in
300
Notify your teacher
What is, If a laboratory fire erupts, immediately
300
To the left of the zigzag line
What is, Where are metals located in the periodic table?
300
Group 1, the first column on the left.
What is, In the periodic table, the most reactive metals are found
300
Number of valence electrons.
What is, The factor that determines how an atom interacts with other atoms is its
300
New substances are produced.
What is, What always happens as a results of a chemical reaction?
400
Away from everyone
What is, You are heating a substance in a test tube. Always point the test tube
400
Metals
What is, Which group contains the most elements?
400
Silicon
What is, Which member of the carbon family is a nonmetal?
400
The element’s atomic number
What is, What information in the periodic table indicates the number of protons and/or electrons in an atom?
400
Either absorbed or released.
What is, During chemical reactions, energy is
500
Read all directions carefully to know what equipment you will need, examine all glassware to check for chips or cracks
clean any glassware that appears dirty
What is, when gathering glassware and equipment for an experiment, you should
500
Metals show a wide range of chemical properties.
What is, Which of the following statements about metals is true?
500
Calcium and magnesium.
What is, The two most common alkaline earth metals are
500
Are in the same period.
What is, The elements in a row of the periodic table
500
A chemical change
What is, The burning of wood is an example of
a. a physical change
b. a chemical change
c. a chemical reaction
d. a change in state