Properties
Fill in the blank.
The melting point of a substance is determined based on when the substance ______________ to melt.
Begins/ Starts
Give an example of a substance and mixture.
Check student work.
What is a chemical reaction?
When mixing two or more substances together to create something new. Process can't be undone or reversed.
Read the passage below to find the evidence to complete your missing data to the substance's property of color.
Our research team received 2 unknown samples suspected to be a type of clay and bread dough. The first observation was the color of the substance of clay it presented as a slightly blue color to it while the bread dough had a light brown color to it.
Color:
Clay: Blue
Bread dough: Light brown
Define Solubility:
Solubility: When a substance can break down or dissolve within a liquid.
Does the amount of a substance affect its melting point?
Fat 2.5cm: 65 degrees melting point
Fat 5cm: 65 degrees melting point
Soap 2.5cm: Higher that 100 degrees
Soap 5cm: Higher that 100 degrees
The amount of a substance doesn't affect it's melting point. Fats melting point will always be 65 no matter the amount of fat there is. Soap will always be higher than 100 no matter the amount of soap there is.
Which of the following is an example of a mixture?
A. Freezing water
B. Melting fat
C. Making hot chocolate
D. Baking Bread
C. Making hot chocolate
In science when creating a chemical formula, we do NOT use an equal sign we use a what to show the end result?
Arrow sign
Read the passage below to find the evidence to complete your missing data to the substance's property of hardness.
A simple examination revealed its hardness of bread dough to be notably squishy while clay revealed its hardness to be firm.
Hardness:
Clay: Firm
Bread Dough: Squishy
What is the difference between a product and reactant and old and new substances?
Reactant: What substances are being combined together
Product: End results
Old substance: Original materials
New substance: New substance created
Does the size and thickness of metal affect the property of hardness? (Think back to the lab where we did the scratch test on the different metals)
The amount of a substance does not affect its property of hardness. We found that the hardness of zinc was the same regardless of its size and thickness.
Which change will produce a new substance that can’t be undone?
A. dissolving cocoa mix in water
B. burning a piece of bread in a toaster
C. heating water until it evaporates
D. cooling water until it freezes
B. burning a piece of bread in a toaster
Part 1:
Draw a molecular model of H2O
Part 2:
If I had two molecules of H20 (water) how many total hydrogen and oxygen atoms would there be?
Part 1:
Check student drawings.
Part 2:
Hydrogen: 4 Oxygen: 2
Read the passage below to find the evidence to complete your missing data to the substance's property of melting point.
To determine the melting point of clay, the sample was slowly heated. We recorded its melting point at 350∘C. When placing a small amount of bread dough on a heating element, we conclusively determined that the melting point of bread dough to be 25∘C.
Melting point:
Clay: 350
Bread dough: 25
Figure the density of this unknown object using the following data: D=M/V
(/) means to divide
Length: 13 cm
Height: 5 cm
Mass: 22 grams
Color: blue
Hardness: 2.3
Volume: 3 cm
Density = _______________
Density = 7.3
Fill in the missing data. 2-part question.
Part 1:
If I had salt in a packet and salt cubes, are they the same substances?
Part 2:
Salt Packet:
Distilled water: Soluble
Rubbing Alcohol: Soluble
Oil: ___________
Salt Cubes:
Distilled water: __________
Rubbing Alcohol: __________
Oil: Not Soluble
Part 1:
Both salt packets and salt cubes are considered to be the same substances just in a different shape.
Part 2:
Salt Packet:
Oil: Not Soluble
Salt Cubes:
Distilled water: Soluble
Rubbing Alcohol: Soluble
Define:
Substance:
Mixture:
Substance: Something made up of one material all the way through.
Mixture: 2 or more substances being combined together
Look at the symbols for magnesium, oxygen, and magnesium oxide. DRAW the molecular model of Magnesium Oxide.
*Draw on white board the model of magnesium and oxygen.
Check students work.
Read the passage below to find the evidence to complete your missing data to the substance's property of density.
Finally, using precision instruments, the density was accurately measured. The final calculation showed a density of 0.84 g/cm3 for clay and bread dough density was recorded at 0.92 g/cm3.
Density:
Clay: 0.84 g/cm3
Bread dough: 0.92 g/cm3
Find the volume of the 3 different size pieces of rocks.
Rock #1 Large:
Volume of rock and liquid: 88
Volume of liquid: 47
Volume of rock: _______
Rock #2 Medium:
Volume of rock and liquid: 73
Volume of liquid: 47
Volume of rock: _______
Rock #2 Small
Volume of rock and liquid: 55
Volume of liquid: 47
Volume of rock: _______
Rock #1 Large: 41
Rock #2 Medium: 26
Rock #2 Small: 8
What are the 5 different properties?
Color
Hardness
Solubility
Melting Point
Density
With the samples below determine if it is either a substance or mixture.
Strawberry Milk:
Gold:
Air:
Salt:
Water:
Strawberry Milk: Mixture
Gold: Substance
Air: Mixture
Salt: Substance
Water: Substance
The drawing on your table shows a model developed to represent a molecule of copper acetate. Based on the model, what is the atomic composition of the FINAL product for copper acetate? Fill in the blanks with the correct number of atoms. HINT: You're only looking at the FINAL product or what's after the arrow.
Copper Atoms (CU): _______
Hydrogen Atoms (H): ______
Oxygen Atoms (O): ______
Carbon atoms (C): _______
Copper Atoms (CU): 4
Hydrogen Atoms (H): 6
Oxygen Atoms (O): 4
Carbon atoms (C): 1
Read the passage below to find the evidence to complete your missing data to the substance's property of solubility.
A crucial part of the analysis was determining the solubility of both substances. When clay is introduced to water, the sample does NOT dissolve. On the other hand, when clay is added to oil, the sample DOES dissolve or break down fully. When a small amount of bread dough was introduced to water, it showed that it DID in fact dissolve and break down. In contrast, when mixed with oil, the sample bread dough does NOT dissolve.
Solubility:
Clay
Water: NOT soluble
Oil: Soluble
Bread dough
Water: Soluble
Oil: Not soluble
When carbon and oxygen interact together, it produces Carbon Dioxide, which is a new substance. Write out the
- Word equation: _____ + _____ ----> ______
- Label the reactant, product and new/ old substance
Word equation:
Carbon + Oxygen ----> Carbon Dioxide
Reactant/ OLD Product/ NEW