Reporting Period 1 Review

How many valence electrons are in an atom of each element in Group 18?

A student mixed liquid detergent and baking soda. When the two are combined, bubbles are produced. Which statement is correct?

• baking soda and liquid detergent repel on another and bubbles were produced

• the two produced bubbles because the law of conservation of mass was not correct

• the two produced bubbles with is an evidence that a chemical reaction occurred

• the two produced bubbles which indicated a physical change

Which is NOT a physical change?

• cutting an apple

• the apple dries out

• the apple appears brown

• the apple is chopped into small pieces

Which of the following describes each element in the chemical formula: C₆H₁₂O₆S

• C-6 atoms, H-12 atoms, O-6 atoms, S-1 atom

• C-12 atoms, H-12 atoms, O-6 atoms, S-2 atom

• C-6 atoms, H-6 atoms, O-6 atoms, S-1 atom

• C-6 atoms, H-12 atoms, O-12 atoms, S-2 atom

If an element is a very stable gas, in which group does it belong?

• 1

• 2

• 17

• 18

Which element is least reactive?

• Mg

• As

• Kr

• K

What subatomic particles are found in the nucleus of an atom?

• positive and negative charged particles

• positive charged particles only

• neutral charged particles only

• positive and neutral charged particles

An element is shiny, silver in color, brittle solid, and a semi-conductor. What type of element is this?

• metal

• nonmetal

• metalloid

• noble gas

Which element is found in period 3 and 7 valence electrons?

• Ar

• Cl

• Br

• Mn

Iron, Nitrogen, and Argon are found in the periodic table. Which of the following describes these elements?

• iron is malleable and conducts electricity

• nitrogen is malleable and does not conduct electricity

• argon is malleable and conducts electricity

• all three are malleable and conduct electricity