Science

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.