Properties that can be observe when a chemical reaction occurs. The composition of the matter changes.

properties that we can measure and observe without changing the composition of the matter

____ is the basic unit of a matter.

Atoms are made up of subatomic particles known as: ____, ___, and ____

The ____ and ____ are in the center of the atom.

Made up of two atoms

made up of three or more atoms

____, ____ and ____ are the states of matter

States of matter:

Have a defined shape and volume.

Its molecules are very close together...

states of matter

Have a define volume. They adopt the shape of the container.

states of matter

Has no defined volume or shape.

Its molecules are not structured arranged.

Changes of State that require heat:

Changes of State

To pass from the solid into liquid state.

Changes of state

When a liquid pass into gaseous state.

Changes of state that require to cool down:

Read to review ... then select both ok.

If the heat increase, the molecules separate from each other.

If the heat reduce, the molecules come closer together.

_____ are materials formed by atoms of the same type

Elements

Indicates how many protons an atom has.

Elements

Indicates the total mass of the protons and neutrons contained in a single atom of each element.

Identify the parts of the element box:

Use the letter to identify the parts and select your answer

Periodic is when something is repetitive at certain intervals

____ organizes the elements based on their periodic properties.

A Russian Chemist who organized the elements by order of atomic mass in a table and created the periodic table of elements.

____ is the amount of matter an object contains. We can use a ______ to measure it in grams (g) or Kilograms (kg)

____ is the amount of space that an object occupies. *Can be solid or liquid.

Instruments to measure Volume:

If its a solid and has define shape we use a _________

Instruments to measure Volume:

If its a liquid we use a _________

Is the physical property that some materials have to be molded without breaking. (like gold)

Is the physical property of substances or objects that can be stretched without breaking to create threads and wires. (like cooper)

Is the resistance that a substance has to penetration or scratching.

to measure hardness we can use a____

The ease with which an object can ignite and then speed flames spread.

Describes the movement of electrons through matter.

Is used to measure how poisonous a substance is.

___ is the process through which one substance is transformed into another.

Chemical reactions

It is the initial substance.

chemical reactions

It is the final substance.

reactions in which heat is absorbed

(example: photosynthesis)

reactions in which there is a release of energy in the form of light and heat.

(examples: transitions from gas to liquid or liquid to solid)

Many of the chemical changes in nature are due to the presence of oxygen in our atmosphere

Is an exothermic reaction and causes the molecules to acquire oxygen atoms.

Is an exothermic reaction and in this type of reaction a large amount of heat and light is generated and released.

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