Science exam
When a Cl atom gains an electron, it gets a charge of
-1
The electron dot notation for the element indium (#49) is
. in . (The dot on the eye is a electron)
An atom has 6 elections and 6 neutrons, it is electrically neutral. What is the mass nUmber of this atom
12
How many atoms are in C3H603
12
If an atom has 12 protons how many electrons should be present
12
An isotope has a mass has a mass number of 74 and contains 42 nurtons. What is the group number of that element
14
The Maximum number of electrons in the three energy level is
18
The maximum number of electrons in the first energy level is
2
Matter is composed of how many atomic particles usually
3
Which of these atoms is nit an isotope of the other three
3He
Which of the following is true of C14
6 protons 8 neutrons 6 electrons
The maximum number of electrons in the second energy level is
8
Water is a
A compound
What is the smallest particle listen below
A quark
Electron movement is best describes as
A vibration
The attractive force between similar molecules is called
Adhesion
What is the difference between an element and a chemical compound
An element consists of only one type of atom
The smallest unit of an element
Atom
Until the 19th century scientists though that the smallest structure of which matter was composed was
Atom
The number if protons plus the number of nuetrons in an atom equals
Atomic mass
The father an electron is from the nucleus the more likely it will
Be lost
Which is not an ionic compound
C2h5OH
Which of the following IS NOT a covalent compund
CaO
Choose the chemical forumula and compound that has one calcium Aron and 2 chlorine atoms and predict the bond between them
Cacl2 ionic
Without him every, molecular motion would
Cease
Iron and yellow sulfur are heated and form a non-magnetic substance
Chemical change
The sharing gaining and losing electrons cause a
Chemical change
The science that looks at how stuff is made and how to make new stuff
Chemistry
The force of attraction together that hold water molecules together
Cohesion
A chemicals reaction must take place to form
Compound
Formed when an atom gains or loses or shares an electron
Compound
H20
Compound
Matter that can not be broken down easily but can be written as a formula
Compound
Water is an example of a
Compund
A bond between nitrogen (#7) and oxygen (#8) would be
Covalent
In what type of compound are the elements shared
Covalent
Hydrogen fluoride has a ____ bond and its chemical formula is _____
Covalent , HF
How many valence electrons are in an atom of radon
Eight
What is found in a cloud around the outside of the atom
Electron
The chemical properties of matter comes from mostly its
Electrons
A substance that can't be broken into simpler substances by ordinary means
Element
Which of the following statements is NOT true of elements on the periodic table
Elements to the left of the zig zag line are metalloids
For work to be done you must have
Energy
The thing that is needed to do work
Energy
Chemcial shorthand formed by a combinatuin if symbols, formulas or both
Equation
The burning of a match
Exothermic reaction
Non metals tend to _________ electrons to become _____
Gain, negative
What does the symbol ^ mean in an equation
Gas
If element 120 was found where would it be placed on the periodic table
Group 2, period 8
With an energy increase, molecular motion would
Increase
An element with an electrical change
Ion
A compound where electrons are transferred
Ionic
What matter is found naturally I'm all three states on earth
Iron
Which has the greatest number of protons in its nucleus
Lead
At room temperature Mercury is
Liquid
The actual counted number of atoms in a lump of carbon
Mass
An element whose atoms lose electrons, is usually a solid at room temperature, conducts heat and electricity well, has a density and can be easily hammered or shakes
Metal
What grouo of elememts loose electrons in a chemical reaction
Metals
Iced tea, sugar water & air
Mixture
O2, p4 are
Mixture
What is the sum of all the mass of all of the atoms in a compound
Molecular mass
How many valence electrons do non-metals have
More than 4
Electrons have what charge
Negative
A neutron has what charge
Neutral
Which of the following are electrically neutral
Neutron
Of the following which is not an inert gas
Nitrogen
The octet rule explains the stability of most covalently bonded molecules in terms of
Noble gas configurations
Covalent bond is formed between atoms of
Non-metals
The symbol ➡️ in an equation means
None of the above (yields)
Most of the mass of an atom is found in the
Nucleus
What is found in the center of all atoms
Nucleus
The atomic number is equal to the
Number of protons
Solid matter is mostly empty space, the reason solids don't fall through one another is because
Of electrical force
In an electrically neutral atom, the. Umber of protons I'm the nucleus is balanced by an equal number of
Orbital electrons
Contains carbon compounds
Organic chemistry
What electron level is the most important in a chemical reaction
Outermost
What is the group and period number for the element with an electron configuration of 2-8-6
Period 3, group 16
What is the relationship between the elements number of shells and the element placement on the periodic table
Periodic placement
Dry ice (solid carbon dioxide -- CO2) becomes a gas by sublimation at room temperature
Physical change
Iron and sulfur mix and form a partially magnetic black and yellow mixture
Physical change
The freezing or melting of matter
Physical change
Protons have what type of charge
Positive
One element is distinguished from another by the number of
Protons
Which two particles are about equal in mass
Protons and neutron
In covalent bonds, electrons are
Shared
How may valence electrons are in an atom of sulfur (#16)
Six
Matter that is rigid and has shape
Solid
Atoms tend to Complete their outer shell by all of the following except
Splitting
Fe, Cl, Au, O, C, and N are
Symbols
What makes an element distinct
The number of protons
The purpose of coefficients in chemical equations is to make
The number of times each element appears as a react and as a product the same
How does the mass of a protons compare to the mass of an electron
The proton is much more massive
Compared to the energy it takes to seperate oxygen and hydrogen from water, the amount of energy given off when they recombine is
The same
Elements in a family or group in the periodic table often share similar properties be chase
Their atoms have the same number of electrons in their outer level
Which of the following statements is true
There are only about 100 different kinds of atoms that combine to form all substances
N has 5 valence electrons and it is a diatomic molecule. How many covalent bonds are there in a N2 molecule
Triple
How many different elements are in a water molecule
Two
How many electrons will a calcium atom (ca) element 20 lose in order to get w noble gas configuration
Two
Which of these atoms has the most mass
Uranium
The number if electrons an element will exchange or share during a reaction
Valence number
