What are 3 common types of evidence for a chemical change?

Change in color, production of a gas, forms a precipitate

Process that separates materials based on size of its particles

what is malleability?

Ability of an object to be hammered without shattering

Why must a chemical equation be balanced?

In order to show that mass is conserved during a reaction

What is a double replacement reaction?

An exchange of positive ions between the compounds

What is a single replacement reaction?

Where one element replaces a second element in a compound

Elements that have a different number of electrons and protons

How were the elements arranged on the first periodic table?

In rows in order of increasing mass

what is a compound made of?

is made up of two or more elements in a mixed ratio

What is a combustion reaction?

A chemical change in which an element or compound reacts with oxygen

The law of conservation of mass states that

Mass can neither be created or destroyed in a chemical reaction

Process that use observation & investigation to gain knowledge about events

Either a positive or negative charge

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1
What are 3 common types of evidence for a chemical change?
Change in shape, change in color, production of a gas
Change in shape, production of gas, change in color
Change in color, production of a gas, forms a precipitate
Change in color, forms a precipitate, change in shape
2
What is life science?
Deals with living things
deals with pollution
Deals with the investigations of earth and space
Deals with matter and energy
3
What is filtration?
Process that separates materials based on size of its particles
Is a process you can use to separate mixtures
Is a process you can use to separate compounds
Is a process that separates stuff based on height and length
4
what is malleability?
if the object gets hit by something it is gonna break into pieces
is the ability of an object not to break if it gets hit by something
is the ability of the object being broken down into pieces
Ability of an object to be hammered without shattering
5
Why must a chemical equation be balanced?
In order to show the number of neutrons in an atom
In order to show the number of molecules in an atom
In order to show the number of molecules in an atom
In order to show that mass is conserved during a reaction
6
What is a double replacement reaction?
An exchange of electrons between the compounds
An exchange of neutrons between the compounds
An exchange of negative ions between the compounds
An exchange of positive ions between the compounds
7
What is a single replacement reaction?
Where one neutron replaces another neutron in a compound
Where one electron replaces another electron in a compound
Where one element replaces a second element in a compound
Where one atom replaces another atom in a compound
8
what is an ion?
Elements that have a different number of electrons and protons
Elements that have the same number of electrons protons and neutrons
Elements that have the same number of electrons than neutrons
Elements that have the same number of electrons and protons
9
How were the elements arranged on the first periodic table?
In rows in order of increasing mass
Decreasing atomic number
In alphabetical order
Increasing atomic number
10
what is a compound made of?
is made up of an element or more
compounds are small mixtures of small things
is made up of two or more elements in a mixed ratio
always has exactly the same composition
11
What is a combustion reaction?
A physical change in which an element or compound reacts with oxygen
A chemical reaction in which a compound reacts with carbon dioxide
A chemical change in which an element or compound reacts with oxygen
A physical reaction in which an element reacts with carbon dioxide
12
The law of conservation of mass states that

Mass can neither be created or destroyed in a physical reaction
Mass can be created in a chemical reaction
Mass can be created in a physical reaction
Mass can neither be created or destroyed in a chemical reaction

Who first organized the periodic table?

J.J. Thompson
Demitri Mendeleev
Dalton
Rutherford

What are the 3 main categories of science?

Chemistry science, animal science, physical science
space science, physical science, earth science
Life science, earth science, physical science
Rock science, atoms science, physical science

What is an example of chemical change?

Ice melting
Burning wood
Boiling water
Cutting wood

What is science?

A term to describe how to observe and gain knowledge about living things
Is a tool that scientists use to learn knowledge and investigate things.
Process that use observation & investigation to gain knowledge about events
Science is an observation that you can use to find how things work & live

What factors determine whether a molecule is polar or nonpolar?

The number of neutrons in a molecule
The number of protons in a molecule
The type of atoms and the shape of the molecule
The number of electrons in a molecule

What is Dalton's atomic theory?

That atoms are the smallest particles of matter
All elements are not composed of atoms
That atoms never touch each other
All elements are composed of atoms

What is a polar covalent bond?

A covalent bond in which protons are not shared equally
A covalent bond in which electrons are not shared equally
A covalent bond in which protons are shared equally
A covalent bond in which electrons are shared equally

What is a pure substance?

always has exactly the same composition
is made up of an element or compound
is made up of two or more elements in a mixed ratio
is made up of 4 elements or more

Who was the earliest person to propose the idea of atoms?

Dalton
Democritus
Rutherford
J.J Thompson

what is an ionic bond?

a force that holds electrons and protons together
a force that holds atoms together
a force that holds electrons and neutrons together
a force that holds anions and cations together

A chemical equation tells you

The number of protons before the reaction
The substances before and after the reaction
The number of electrons before the reaction
The number of atoms before and after the reaction

Ions have

A neutral charge
A positive charge
a negative charge
Either a positive or negative charge

What is a covalent bond?

A chemical bond which two nonmetal atoms share a pair of valence electrons
A chemical bond in which two metal atoms share a pair of valence electrons
A physical bond which two nonmetal atoms share a pair of valence electrons
A physical bond in which two metal atoms share a pair of valence electrons

what is a mixture made up of?

atoms
compounds
elements
elements and compounds

What is Distillation?

A process in which you can separate stuff
Is a process that separates substances in a solution based on melting point
A process you can use to separate mixtures or compounds
Process that separates substances in a solution based on boiling point

How are the elements arranged on the modern periodic table?

In alphabetical order
They aren't
Decreasing atomic number
Increasing atomic number

A chemical change occurs when

A substance reacts to form one or more new substances
a physical change occurs
Materials are seperated
something catches on fire

What did John Dalton do?

Gathered evidence on blood cells and how they work
Gathered evidence on the nervous system
Gathered evidence for the exsistence of atoms
Gathered evidence for the exsistence of Mars

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