Science 8 ● Semester B
Structure and Properties of Matter Portfolio
Virtual Lab
Instructions:
Read through the lab completely before beginning the experiment. Check the Lab Rubric at the end of this document for grading.
Collect all necessary materials before beginning the lab.
Create a copy of this lab so you can fill it out as you go. Do not request editing access. You can print it and write on it, or you can make a copy in Google Docs or Microsoft Word.
Save a finished copy of this worksheet that includes your answers. Upload it into the Matter Interactions Sample Work Dropbox Unit 4 Lesson 12.
Reach out to your science teacher if you have any questions!
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Reactants, Products and Leftovers
Instructions: Carefully read the directions to complete the virtual tasks in order. Then answer each of the questions given.
1. Click this link:
I.Reactants, Products and Leftovers:
→ Click the “Sandwiches” tab.
→Click the Meat and Cheese option on the right hand corner.
→ Find the missing number of reactants and products given in the table below, by using the given numbers for the Sandwich trial.
→ Using the number already given in the table, put that number in for the given reactants on your pHet screen. Then by adding or removing the other reactants find the correct number to give you an even amount of products with NO leftovers. (YOU CANNOT CHANGE THE GIVEN REACTANT NUMBER FROM THE CHART)
II. Reactants, Products and Leftovers Table: (3 points)
Sandwich Trial #:
Number of Reactant Bread
Number of Reactant Cheese
Number of Reactant Meat
Number of Total Sandwich Products
Example
2
1
1
1
#1
4
#2
4
#3
3
III. Reactants, Products and Leftovers Questions:
1. Why do you have a certain number of reactants on the left side? Use the example below to support your answer.
Type Answer HERE:
2. The sandwich example relates to the law of conservation of matter for chemical equations. Matter cannot be created nor destroyed. This is why there must be the same number of atoms on the rectant side as on the product side. Looking at the image below, does it demonstrate the Law of Conservation of Matter? Explain why.
Type Answer HERE:
A student was adding baking soda and vinegar in a bottle to conduct an experiment. They then out a balloon on top of the bottle immediately after adding them together. The student observed that the balloon infalted and got larger. The student then predicted that the chemical reaction between the vinegar and the baking soda had created brand new matter, and would have more mass at the end of the reaction. Would you agree with the student's prediction or not? Explain your answer.
Type Answer HERE:
Build an Atom
Instructions: Carefully read the directions to complete the virtual tasks in order. Then answer each of the questions given.
1. BEFORE building your atom, please watch this very important video on Atomic Structure: Atomic Structure And Electrons - Structure Of An Atom - What Are Atoms - Neutrons Protons Electrons
2. Click this link:
IV. Build an Atom:
→ Click the “Atom” tab.
→Now Create a NEUTRAL atom model for Beryllium with a Mass Number of 9. Hint: for this atom you will need to add 5 Neutrons.
→ Drag the correct number of Protons, Neutrons, and Electrons onto the virtual atom model. Then take a screenshot of the model. Example of a screenshot of a Carbon Atom:
V. Build an Atom Questions:
4. Add your Screenshot of your Beryllium Atom Here.
Insert Model HERE:
For a model of beryllium with a Mass Number of 9, give the correct number of Protons, Neutrons, and Electrons there should be in the model?
Type Answer HERE:
Protons-
Neutrons-
Electrons-
What is the correct charge for the following subatomic particles: proton, neutron, electron?
Type Answer HERE:
Protons-
Neutrons-
Electrons-
VI. Pure Substances vs Mixtures:
Watch the following Video and use the image below to answer the questions in the following section.
Pure Substance vs Mixture
VII. Pure Substances vs Mixtures Questions:
Type Answer HERE:
8. Identify each of the models below as a homogeneous mixture, heterogeneous mixture, element, or compound.
Type Answer HERE:
i.-
ii.-
iii.-
iv.-
Type Answer HERE:
VII. Analyzing the Data:
10 .The graph below shows the phase change for H2O.
Which statement best describes what is occurring at segment C?
Type Answer HERE:
As energy increases, the temperature remains the same.
As energy increases, temperature also increases.
As temperature increases, energy remains the same.
Energy and temperature remain the same.
Type Answer HERE:
Kate should draw particles far apart and moving freely to show thermal energy being added to a liquid.
Kate should draw particles far apart in a fixed position to show thermal energy being removed from a liquid.
Kate should draw particles close together in a fixed position to show thermal energy being added to a liquid.
Kate should draw particles close together and moving freely to show thermal energy being removed from a liquid.
12. The table below shows the densities, in grams per milliliter (g/mL), of four unknown liquids and water.
Liquid
Density (g/mL)
Q
1.3
R
1.7
S
1.2
T
0.8
Water
1.0
Which liquid will float on water?
Type Answer HERE:
Liquid Q
Liquid R
Liquid S
Liquid T
Type Answer HERE:
A physical change occurred which is evidenced by the change in color of the solution.
A chemical change occurred which is evidenced by the change in color of the solution.
A physical change occurred which is evidenced by the dissolved iron in the solution.
A chemical change occurred which is evidenced by the dissolved iron in the solution.
14. This is the periodic table of the elements.
Using the periodic table, Maria drew a diagram of a neon atom. The diagram shows what Maria drew.
Which mistake did Maria make on her diagram?
Type Answer HERE:
The protons should be circling the nucleus, not the neutrons.
The neutrons should be circling the nucleus, not the protons.
The nucleus should have electrons and neutrons, not neutrons and protons.
The nucleus should have protons and neutrons, not protons and electrons.
READING & EVIDENCE IN SCIENCE
VII. Reading & Evidence Questions: Follow the instructions to open the required MyON Reading for this portfolio. Use the assigned book to help you answer the following questions.
15. What is an indication of a chemical change? Which two substances reacted in the experiment? Use the text on pages 14-15 to support your answer.
Type Answer HERE:
16. Acetic acid reacted with minerals in the bone to produce a chemical reaction. What was the result of the reaction? Use the text on pages 16-17 to support your answer.
Type Answer HERE:
17. In all chemical reactions, what are the reactants and the products? Use the text on pages 26-29 to support your answer.
Type Answer HERE:
1 answer
Reactants, Products and Leftovers Table: (3 points)
Sandwich Trial #:
| Reactant Bread | Reactant Cheese | Reactant Meat | Total Sandwich Products |
|-----------------|------------------|----------------|-------------------------|
| 2 | 1 | 1 | 1 |
| 4 | (To be determined)| (To be determined)| (To be determined) |
| 3 | (To be determined)| (To be determined)| (To be determined) |
Reactants, Products and Leftovers Questions:
-
Why do you have a certain number of reactants on the left side? Use the example below to support your answer.
- Type Answer HERE:
We have a certain number of reactants on the left side because they represent the starting materials needed for a chemical reaction to occur. In the sandwich example, the bread, cheese, and meat are essential ingredients that combine in specific ratios to produce sandwiches. The number of each reactant must be balanced to ensure that all ingredients will be utilized without any leftovers, illustrating the importance of accounting for each reactant in a reaction.
-
Does the image demonstrate the Law of Conservation of Matter? Explain why.
- Type Answer HERE:
Yes, the image demonstrates the Law of Conservation of Matter because it shows that the total number of atoms (ingredients) before the reaction is equal to the total number after the reaction. In other words, the atoms of bread, cheese, and meat that go into making the sandwiches are not lost or created; they are simply rearranged and transformed into a different form (the sandwiches themselves).
-
Regarding the reaction between vinegar and baking soda:
- Type Answer HERE:
I would disagree with the student's prediction. According to the Law of Conservation of Matter, the total mass at the end of a reaction must equal the total mass at the beginning. Even though the reaction produces gas that inflates the balloon, no new matter is created in terms of mass; the total mass remains constant. The gas produced is simply a different state of the original reactants, not an increase in mass.
Build an Atom Questions:
-
Add your Screenshot of your Beryllium Atom Here.
- Insert Model HERE:
(Insert Screenshot here)
-
For a model of beryllium with a Mass Number of 9, give the correct number of Protons, Neutrons, and Electrons there should be in the model?
- Type Answer HERE:
- Protons - 4
- Neutrons - 5
- Electrons - 4
-
What is the correct charge for the following subatomic particles: proton, neutron, electron?
- Type Answer HERE:
- Protons - Positive (+1)
- Neutrons - Neutral (0)
- Electrons - Negative (-1)
Pure Substances vs Mixtures Questions:
- Identify each of the models below as a homogeneous mixture, heterogeneous mixture, element, or compound.
- Type Answer HERE:
- i. - Element
- ii. - Compound
- iii. - Homogeneous Mixture
- iv. - Heterogeneous Mixture
Analyzing the Data:
-
Which statement best describes what is occurring at segment C?
- Type Answer HERE:
As energy increases, the temperature remains the same.
-
What should Kate draw in terms of particles at segment C?
- Type Answer HERE:
Kate should draw particles close together in a fixed position to show thermal energy being added to a liquid.
-
Which liquid will float on water?
- Type Answer HERE:
Liquid T (since it has a density of 0.8 g/mL, which is less than that of water).
-
What kind of change occurred in the solution?
- Type Answer HERE:
A chemical change occurred which is evidenced by the change in color of the solution.
-
Which mistake did Maria make on her diagram?
- Type Answer HERE:
The nucleus should have protons and neutrons, not neutrons and protons.
READING & EVIDENCE IN SCIENCE Questions:
-
What is an indication of a chemical change? Which two substances reacted in the experiment?
- Type Answer HERE:
An indication of a chemical change is the production of gas, a change in color, or the formation of a precipitate. In the experiment, vinegar (acetic acid) and baking soda (sodium bicarbonate) reacted with each other.
-
What was the result of the reaction between acetic acid and minerals in the bone?
- Type Answer HERE:
The result of the reaction was the formation of soluble compounds, which caused the minerals in the bone to dissolve and the bone to weaken or disintegrate.
-
In all chemical reactions, what are the reactants and the products?
- Type Answer HERE:
In all chemical reactions, reactants are the starting substances that undergo a change to form products. The reactants in a chemical equation are present on the left side, while the products are the substances formed from the reactants and are located on the right side of the equation.