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Chemistry Essential Question and Skills
How do particles combine into new substances? What evidence can show how the
physical and chemical properties of the substances change?
1.
I can identify and create models that show the smallest component of an element
is an atom.

Draw an atom. (Nucleus, proton, neutron, proton)

Identify the mass and how many protons an element has by looking at the Periodic Table. (atomic mass, atomic
number)

The smallest form of an element is an atom.

Elements are made up of the same type of atom.
2. I can describe how the elements within the periodic table are organized by
similar properties.

When given a periodic table identify highly reactive metals, less reactive metals, highly reactive nonmetals and
non reactive gases. (Alkali metals, alkaline earth metals, transition metals, metalloids, non metals, halogens, noble
gases)

State that the elements in the periodic tables are put into groups that have similar properties.
3. I can recognize how the particles in an element, molecule, compound, and mixture
are different.

If looking at a picture of the particles in a substance, choose whether it is an element, molecule, or mixture.

Draw a picture of what the molecules of water, carbon dioxide and salt look like.
4. I can identify physical and chemical properties of the reactants and products of a
reaction.

Identify the physical properties of color, state of matter, boiling point, density, mass, volume, and temperature.

Identify the chemical properties of flammability, pH, and reactivity.

Recognize that in reactions the properties of substances change.

Identify factors that can change physical properties (solutes, temperature, etc)

Physical properties of the molecules in a substance change when energy is added or removed. (molecular motion
and arrangement)

Energy transfers in phase changes. (evaporation, melting, sublimation, condensation, freezing, deposition)
5. I can provide evidence to show if a reaction is a chemical or physical change.

Identify evidence of a chemical change as: color change, temperature change, gas production, solid formation
(precipitate), pH change.

Recognize that when a chemical reaction occurs, the chemical properties of the substances change.
6. I can explain that when a reaction occurs that energy can be gained or released,
but the amount of matter in the system stays the same.

In a chemical reaction bonds are broken and formed.

In a chemical reaction, the elements in the reactants are the same as the elements in the products.

When bonds are broken, energy is released (exothermic) and when bonds are formed, energy is taken in
(endothermic).

The number of molecules is the same before and after a reaction.