Science 8 ● Semester B

Question

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:

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:

GPT-4o mini · Answer

### Reactants, Products and Leftovers **II. Reactants, Products and Leftovers Table:** | 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 | 2 | 4 | | #2 | 4 | 4 | 4 | 4 | | #3 | 3 | 1 | 1 | 1 | **III. Reactants, Products and Leftovers Questions:** 1. **Answer:** The number of reactants on the left side represents the ingredients necessary to create the products. In the sandwich example, if you are using 2 pieces of bread, 1 slice of cheese, and 1 piece of meat, those are the inputs. For each combination of these ingredients, there can only be a certain number of possible sandwiches, supporting the idea that you cannot create something new without the right amounts of ingredients. 2. **Answer:** Yes, the image demonstrates the Law of Conservation of Matter because it shows that the total number of atoms (reactants) used to create the sandwiches (products) is accounted for on both sides. This aligns with the principle that atoms are neither created nor destroyed in a chemical reaction—rather, they are rearranged to form new substances. 3. **Answer:** I would disagree with the student's prediction. While the balloon inflating suggests a chemical reaction has produced gas, the total mass before the reaction and after the reaction should remain the same according to the Law of Conservation of Matter. Even though new gas is produced, it doesn't equate to an increase in mass; rather, it is a conversion of the reactant masses into products. --- ### Build an Atom **IV. Build an Atom:** Insert Model HERE: (Screenshot of Beryllium Atom) **V. Build an Atom Questions:** - **Type Answer HERE:** - Protons - 4 - Neutrons - 5 - Electrons - 4 --- ### Pure Substances vs Mixtures Questions: **VIII. Pure Substances vs Mixtures Questions:** 8. **Type Answer HERE:** - i. - Compound - ii. - Element - iii. - Homogeneous Mixture - iv. - Heterogeneous Mixture **IX. Analyzing the Data:** 10. **Type Answer HERE:** The statement that best describes what is occurring at segment C is: "As energy increases, temperature remains the same." This indicates a phase change, where the substance is changing from solid to liquid or liquid to gas. 11. **Type Answer HERE:** Kate should draw particles far apart and moving freely to show thermal energy being added to a liquid. 12. **Type Answer HERE:** Liquid T will float on water because its density (0.8 g/mL) is less than the density of water (1.0 g/mL). 13. **Type Answer HERE:** A chemical change occurred which is evidenced by the change in color of the solution. 14. **Type Answer HERE:** The mistake Maria made on her diagram is that the nucleus should have protons and neutrons, not neutrons and electrons. --- ### READING & EVIDENCE IN SCIENCE **VII. Reading & Evidence Questions:** 15. **Type Answer HERE:** An indication of a chemical change can be the formation of a new substance, such as a gas or color change. In the experiment, vinegar and baking soda reacted. 16. **Type Answer HERE:** The reaction between acetic acid and the minerals in the bone resulted in the dissolution of the minerals, which changed the structure of the bone. 17. **Type Answer HERE:** In all chemical reactions, reactants are the starting substances that undergo change, and the products are the substances formed as a result of the chemical reaction. --- This completes your portfolio for the Structure and Properties of Matter lab. Make sure to review all components and submit the completed document! If you have any questions, don't hesitate to reach out to your teacher.