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Introduction to General Chemistry Flashcards | StudBud
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Introduction to General Chemistry
Introduction to General Chemistry
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1
What are the horizontal rows on the periodic table called?
Groups
Actinides
Elements
Periods
2
What is the definition of an element?
Something made of more than one type of atom.
Something made of earth, air, water or fire.
Something made of atoms.
Something made of only one type of atom.
3
Chemistry is the science of matter and the __________ changes of matter.
Chemical
Organic and inorganic
Physical
Physical and chemical
4
What are the vertical rows on the periodic table called?
Actinides
Groups
Periods
Elements
5
Physical or Chemical Change? Elements react to form compounds.
Physical
Chemical
6
Enzymes act as CATALYSTS to ____________________ chemical reactions
speed up
slow down
stop
increase
7
The sum of the number of protons and neutrons inside the nucleus is called the __________.
mass number
atomic number
nucleus number
element number
8
Pure substance or mixture?
steel
Pure substance
Mixture
9
Chemical reactions change substances into diff. ones by breaking and forming chemical bonds.
True
False
10
What is the first element on the periodic table?
Helium
Oxygen
Lithium
Hydrogen
11
Acids and Bases. The pH of acids is
less than 7
7
about 0.
more than 7
12
The number of protons an atomc contains is identified by the ____ ____ on the periodic table.
atomic #
group #
mass #
row #
13
Pure substance or mixture?
Gold
Pure substance
Mixture
14
The periodic table is arranged _______________.
alphabetically
by increasing atomic mass
by increasing atomic #
15
Where are the electrons located in the atomic structure?
It is not in the atomic structure
What is an electron?
Outer orbitals
Nucleus
16
Most element on the periodic table are ____
metals
nonmetals
gases
17
How do you find density?
mass over volume
volume over density
volume over mass
density over mass
18
Elements in group 13 have _________ valence electrons.
2
3
1
19
Combustion reactions are
endothermic
exothermic
20
Where is the proton located within the atomic structure?
What is atomic structure?
It is not in the atomic structure
electron cloud
nucleus
