Physical Science 2Q 1 - 10: Question Preview (ID: 11727)

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Which of these is MOST responsible for chemical reactions?
a) Electrons in the nucleus of the atoms
b) Electrons in the highest occupied energy level of the atoms
c) Electrons closest to the nucleus of the atoms
d) Electrons traveling the fastest toward the center of the atoms

Electrons in the highest occupied energy level of an atom determines an elements -
a) capacity to create mixtures
b) ability to make solutions
c) physical structure
d) chemical properties

How many atoms are present in one molecule of NaHCO2?
a) 3
b) 5
c) 4
d) 7

Which compound has the following : 3 Oxygen, 1 Carbon, 2 Sodium
a) CO3N2a
b) Na2CO3
c) ONa5C
d) NaOC3

What is a covalent bond?
a) a bond formed when atoms share electrons
b) super molecules
c) a solution
d) no electron

A melting ice cube is undergoing what type of change?
a) chemical change
b) physical change
c) potential change
d) nuclear change

Which of the following is an example of a physical change?
a) polishing silver
b) breaking a wooden ruler
c) burning a match
d) digesting food

Which of the following is an example of a chemical change?
a) chocolate melting in the sun
b) ripping paper
c) dissolving sugar in water
d) burning wood

When cars are left in a junk yard, what was once shiny steel turns into brown, brittle rust. What type of change is this?
a) chemical change
b) physical change
c) nuclear change
d) mass change

When you combine vinegar and baking soda, it gives off gas. The reactants are vinegar and baking soda, what is the gas
a) reactants
b) products
c) elements
d) suspensions

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