Chemistry exam
How many electrons are shared in a single covalent bond
2
How many electrons are shared in a single covalent bond?
2
A molecule is
A group of covalently bonded atoms
Covalent and ionic bonds differ in that...
Ionic bonds don't involve the sharing of electrons
1. 2. 3. 4.
Mono Di Tri Tetra
An atom loses an electron to another atom is this an example of a physical or a chemical change?
Physical change involving the information of negative ions
Nonmetals
Poor conductor of electricity and heat brittle some more solids liquids or gases at room temp examples are carbon and bromine
One element is distinguished from another by the number of
Protons
One element is distinguished from another by the number of?
Protons
The neon Atom tends not to gain any additional electrons because
There is no more room available and it's outermost shell
How many valence electrons are in the electron dot structure for calcium chloride an ionic compound with the formula at CaCL2
8
How many valence electrons are in the electron dot structure for calcium chloride and ionic compound with the formula CaCl2
8
A molecule is?
A group of covalently bonded atoms
What is the relationship between hydrogen ion OH- and a water molecule?
A hydroxide I own is a water molecule minus a hydrogen nucleus
Identify the acid or base behavior. .. H3O+ + Cl-➡️H2O + HCl
Acid.. Base.. Base.. Acid
What is the difference between an element and a chemical compound?
An element consists of only one type of Atom
What is the difference between an element and a chemical compound
An element consists of only one type of atom
Noble gases
Are referred to as inner gases because they are chemically non-reactive the almost never born with other Adams because they are already filled to capacity
Protons+neutrons
Atomic mass
As you move across the periodic table from left to right the blank and blank of elements increase by?
Atomic mass and atomic number
As you move across the periodic table from left to right the ---- and ---- of elements increase
Atomic mass; atomic number
Matter is made up of basic units called?
Atoms
The individual particles of an ionic crystal are?
Atoms
BaCL2
Barium dichloride
Physical properties
Boiling point and hardening point
CO
Carbon monoxide
And Atom loses an electron to another atom.. is this an example of a physical or chemical change?
Chemical change involving formation of positive ions
The proper name for chemical compound N2O is?
Dinitrogen oxide
N2O3
Disodium trioxide
Noble gases
Do not bond
Isotope
Each of 2forms of the same element that contain equal amount of protons and a different amount of neutrons
What elements tend to form ionic compounds?
Elements found on opposite sides of the periodic table
Covalent and ionic bonds differ that?
Ionic bonds don't involve the sharing of electrons
The individual particles of an ionic Crystal are?
Ions
NaCl
Iron disulfide
Magnesium ions carry a 2+ charge and chloride ions carry a 1-charge , what is the chemical formula for the ionic compound magnesium chloride?
MgCl2
Magnesium ions carry a 2+ charge and chloride ions carry a one minus charge what is the chemical formula for the ionic compound magnesium chloride?
MgCl2
Is magnesium ions have a 2+ charge and oxygen ions have a 2 minus charge the compound magnesium oxide is?
MgO
Is magnesium ions have a 2+ charge and oxygen ions have a 2- charge the compound magnesium oxide is?
MgO
When two different elements combine to form a compound the resulting properties of the compound are?
No it's necessarily like those of the elements
Oxygen atoms are used to make water molecules does this mean that oxygen O2 and water H2O have similar properties?
No, because compounds are uniquely different from the elements from which they are made from
Oxygen Adams are used to make water molecules does this mean that oxygen O2 and water H2O have similar properties?
No, the compounds are uniquely different from the elements which they are made
When 2 different elements combine to form a compound the resulting properties of the compound are?
Not necessarily anything like those of the elements
An acid dissolved in water liberates
OH+
A base dissolved in water liberates
OH-
Metalloid
On it that has some of the properties of metals
Generally speaking where are metals found in the periodic table
On the left side and through the central portion
Generally speaking where our metals found in the bureau table
On the left side in through the central portion
The valence shells of two Atoms that are covalently bonded..
Overlap
The valence shells of two atoms are covalently bonded?
Overlap
What does atomic mass represent ?
Protons and neutrons
What does atomic number represent?
Protons or electrons
Metals
Shiny opaque and a good conductor of heat and oaks for city solid at room temp .examples are sodium and calcium
If you eat metallic sodium or chlorine gas you stand a strong chance of dying let these two elements react with each other however and you can safely sprinkled the compound on your popcorn for better taste what is going on?
Sodium chloride does not behave like either sodium or chloride
The name for chemical compound of the formula and NaNO3 is?
Sodium nitrate
The proper name for chemical compound and N2O is ?
Sodium nitrate
What is the hydroxide ion concentration in an aqueous solution where the pH equals 5
The hydronium ion concentration equals 1•10-5
The neon Adam tends not to gain any additional electrons because?
There is no more room available in its outer most occupied Shell
