Chemistry exam

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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


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