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Chemistry 9th
Valence electrons
What is the mass of H ?
Chemistry 9th
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1
What is the mass of H ?
2
16
1
12
2
Valence electrons
Electons in the valence shell
Electrons in the outer most shell
The thing that the proterties of elements largely depend on
Electrons that are involved in the octect rule
3
What is the chemical symbol of gold?
Ag
Gd
Go
Au
4
Subatomic particles in an atom´s nucleus
Elctrons and protons
Ions and electrons
Nutrons and electrons
Nutrons and protons
5
Categories based on the phhysical properties of an elemente are metals, nonmetals and semimetals
True
False
6
What type of mixture is this?
Homogeneous
Heterogenous
Homogeni
Colloid
7
H12 is a compund
False
True
8
A compound is a substance composed of atoms of two elements bonded together.
False
True
9
Is Miss Eli American?
Maybe
1/2
Yes
Nooooo
10
The octect rule says that most atoms tend to react to obtain 6 electrons in the valence shell.
False
True
11
Name of the author of Narnia
S . C Lewy
Clive Staples Lewis
J. K Rowling
C. S Lewis
12
Mass number
The total number of protons and neurons in the nucleus
The averege weight od the electrons
The weight of an atom
The total number of subatomic particles
13
What type of mixture is this?
Heterogenous
Heteromix
Tyndall effect
Homogenous
14
Protons have a negative charge and electrons have a positive charge
True
False
15
Atomic number
Number of protons in the nucleus
The weight of the subatomic particles of an atom
The number of nutrons and protons in the nucleus
The number of valence electrons
16
What is the chemical symbol of Oxygen?
Ox
O
On
H2O
17
Electrons are organized in concentric layers called...
Electron shells
Ovals
Taco shells
Valence shells
18
The 3 factors that influence the dissolving rate are: +temp, +surface are, agitation
True
False
19
Isotopes are atoms of the same elment but with different numbers of nutrons
True
False
20
Period (periodic table)
Atoms have the same number of electron shells
Arranges according atomic number
Each column
Each row
21
This is and example of dissociation
True
False
22
What is the name of the scientis that created the periodic table of elements?
Dmitri Mendleev
Marie Curie
Alfred Nobel
John Dalton
23
Mixture
When things come together and blend
Pure subtances that are chemically united
Pure subtances that are physically mixed
Agua de guayaba
24
The ability of one substance to dissolve in another solution is ...
Solubility
Dissociation
Solution
Dispertion
25
What is chemistry
Study of chemicals
Study of how things are made
Study of the composition and interactions of matter
Study of how matter comes to be
26
What is the chemical symbol for Sodium
Ni
Na
So
S
27
What are the three elements of this image?
Solute, solvent and solution
Spoon, glass and water
Salute, salt and liquid
Suspension, dissociation and mixture
28
What is the name/explanation of this fenomenon?
Colloid
Suspension
Tyndall efect
Heterogenous mixture
29
Group
Rows
Boxes
Same valence elctrons
Cloumns
30
Molecule
Groups of two or more atoms linked by chemical bonds
Groups of valence electrons
Protons that come together with electrons linked by bonds
Groups of two or more types of atoms linked by chemical bonds
