Podcast
Questions and Answers
Why is it recommended to use a transparent ruler when judging a best fit line?
Why is it recommended to use a transparent ruler when judging a best fit line?
- It allows for easier judgment of the fit of the line through the data points. (correct)
- Transparent rulers are more durable than opaque rulers.
- Transparent rulers are required by all laboratory regulations.
- It prevents parallax errors when taking measurements.
To properly calculate density using mass and distance measurements, convert all units to centimeters before calculating volume.
To properly calculate density using mass and distance measurements, convert all units to centimeters before calculating volume.
True (A)
If a measuring tool is marked off in tenths, to what place value should the measurement be recorded?
If a measuring tool is marked off in tenths, to what place value should the measurement be recorded?
hundredths
When constructing a graph, the axes MUST be properly labelled with appropriate _____.
When constructing a graph, the axes MUST be properly labelled with appropriate _____.
Match the following graph elements with their correct guidelines:
Match the following graph elements with their correct guidelines:
What does the intervals assigned on a graph determine?
What does the intervals assigned on a graph determine?
In the context of dilutions, the volume in the molarity equation must be in milliliters.
In the context of dilutions, the volume in the molarity equation must be in milliliters.
What type of data must be graphed in order to determine the concentration of an unknown sample?
What type of data must be graphed in order to determine the concentration of an unknown sample?
When creating a graph of concentration and absorbance, the x-axis represents the _____ variable.
When creating a graph of concentration and absorbance, the x-axis represents the _____ variable.
Match the following types of chemical reactions with their descriptions:
Match the following types of chemical reactions with their descriptions:
What is the purpose of performing the average of the mass densities?
What is the purpose of performing the average of the mass densities?
The intervals you assign on the graph will determine the number of atoms in the sample.
The intervals you assign on the graph will determine the number of atoms in the sample.
What must the volume be in, when using just the molarity equation?
What must the volume be in, when using just the molarity equation?
In a dilution equation, being able to solve for a missing volume or _____ is essential.
In a dilution equation, being able to solve for a missing volume or _____ is essential.
Match the correct name of measurement with its respective unit.
Match the correct name of measurement with its respective unit.
What must you consider when calculating the slope of a line on a graph?
What must you consider when calculating the slope of a line on a graph?
In the context of the spectrophotometer, green light was used to determine the wavelength.
In the context of the spectrophotometer, green light was used to determine the wavelength.
When performing a chemical reaction, what are some visual sign(s) that can occur?
When performing a chemical reaction, what are some visual sign(s) that can occur?
A substance reacts rapidly with oxygen to produce heat and light during a _____ reaction.
A substance reacts rapidly with oxygen to produce heat and light during a _____ reaction.
Match the definitions with the following terms:
Match the definitions with the following terms:
Why is it important to fill most of the graphing area with your data?
Why is it important to fill most of the graphing area with your data?
When determining slope, lines should be labelled with the value of points (do not label the spaces).
When determining slope, lines should be labelled with the value of points (do not label the spaces).
Why was there a difference between the raw and cooked potato?
Why was there a difference between the raw and cooked potato?
An indicator called _____ changes color based on the acidity or basicity of a solution.
An indicator called _____ changes color based on the acidity or basicity of a solution.
Match the following substances with their acid/base categorization:
Match the following substances with their acid/base categorization:
What should you do with your lines when graphing data?
What should you do with your lines when graphing data?
The visual sign of a chemical reaction that occurred is not important.
The visual sign of a chemical reaction that occurred is not important.
Explain what a catalyst does.
Explain what a catalyst does.
Remember to review the _____ carefully for information.
Remember to review the _____ carefully for information.
Associate the type of graph to construct with the appropriate type of data.
Associate the type of graph to construct with the appropriate type of data.
Flashcards
Density
Density
Mass per unit volume, typically in g/cm³ for density.
Measurement Accuracy
Measurement Accuracy
Measurements should reflect the tool's precision; estimate one unit beyond the smallest marking.
Graph
Graph
A visual representation of data showing the relationship between two variables.
Dilution
Dilution
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Spectrophotometer
Spectrophotometer
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Molarity Equation
Molarity Equation
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Dilution Equation
Dilution Equation
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Chemical Reactions
Chemical Reactions
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Enzyme (Catalyst)
Enzyme (Catalyst)
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Anthocyanin
Anthocyanin
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Study Notes
- To prepare for the lab midterm, bring a calculator and a transparent ruler to easily judge the best fit line.
Safety and Density of a Penny
- This was the focus of the first lab
- Review the safety video on YouTube by the American Chemical Society (approx. 30 min).
- Density of a penny can be calculated using mass and distance measurements, using a provided volume formula.
- Units must be converted to cm to calculate volume in cm³
- Note that 1 ml = 1 cm³
Density of Water
- This was the focus of the second lab
- Write measurements to proper accuracy, estimating one 'guessing' unit beyond the measuring tool's markings.
- Calculate densities from given mass and volume values, using the correct number of significant figures.
- Determine final density by averaging individual densities and by constructing/analyzing a graph to determine slope.
- Ensure graphs have a title and properly labeled axes with units.
- Fill most of the graphing area, divide lines into readable units, and label lines instead of spaces.
- Show the two points used for slope as (x,y) to determine rise over run.
- Intervals assigned on the graph determine the significant figures when reporting numbers.
- Tenths can be measured if lines are numbered by ones.
Dilutions
- This was the focus of the third lab
- Review the dilutions powerpoint
- Know the name of the machine and the relevant law
- State the wavelength of purple light used in the spectrophotometer.
- Memorize the molarity equation and be able to rearrange it to solve for moles or volume.
- Volume must be in liters when using the molarity equation (not the dilution equation).
- Solve for a missing volume or molarity using the dilution equation.
- Data of concentration and absorbance will be given to compose a graph and determine the concentration of an unknown.
- Correctly identify the x-axis (independent variable) and the y-axis (dependent variable) on both graphs (density and absorbance).
Chemical Reactions
- This was the focus of the fourth lab
- This section is "fill in the blank" without a word bank, needing careful review of the PowerPoint.
- State the type of reaction, visual signs, physical states, and balanced equations for experiments performed.
- Explain the difference between raw and boiled potatoes, including the enzyme involved and its reaction to cooking.
- Know the role of enzymes (catalysts) in all reactions.
- State what anthocyanin is what and what it does
- Understand the acid/base pH scale and how to categorize ammonia and vinegar.
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