Category: Chemistry

Identify the atom and its components.Describe the structure and function of water and its role in living systems.

Identify the atom and its components.

2. Differentiate between elements and compounds formed by ionic or covalent bonds.

3. Differentiate the types of chemical reactions and associated terminology.

4. Describe the structure and function of water and its role in living systems.

5. Differentiate the functional roles of acids, bases, and buffers.

6. Differentiate the structures and functions of major organic molecules.

What would happen if all gas was removed from the water before the experiment? Would the experiment be more, or less accurate?

Lab 7

1. Why are starch and cellulose used in this experiment?

2. During this experiment, one sugar produced the most gas. Explain why.

3. During the experimental setup, baby oil was layered on top of the yeast-sugar mixture. Explain why.

4. Why is it important to keep the temperature at 35°C for this experiment?

5. Why is the amount of gas you measured only an estimate of the ATP produced? Consider what you know about liquids and gases. How can you change the setup to make it more accurate?

6. What would happen if all gas was removed from the water before the experiment? Would the experiment be more, or less accurate?

Could you foresee difficulty in quantitative analysis of your unknown ion in aqueous solution or ions by weighing the precipitate? Explain why or why not in quantitative terms.

Thin Layer Chromatology Lab 6

State how the results compared to expectations and why they did or did not match.

Which of the group I chlorides has the lowest molar solubility? What is its solubility in moles/L?

Answer this fully and give your reasoning/explanation for your answer

Could you foresee difficulty in quantitative analysis of your unknown ion in aqueous solution or ions by weighing the precipitate? Explain why or why not in quantitative terms.

Answer this fully and give your reasoning/explanation for your answer

What do you initially understand should be included in a scientific laboratory report safety assessment? Describe below your initial thoughts about what should be included.

Portfolio of laboratory report writing skills

What do you initially understand the aim and the introduction of a laboratory report should include? Describe below your initial thoughts about what should be included.

After class work and individual research, what do you now understand the purpose of an aim and introduction to a laboratory report to be? Detail fully what should be included.

Identify the equipment and materials required to perform the investigation.

Discuss the suitability of the equipment, materials and procedure for the investigation in terms of providing reliable and valid results.

Identify the variables in the investigation and explain the consequences of changes to the variables in terms of valid results.

What do you initially understand the materials, procedures and variables of a laboratory report investigation should include? Describe below your initial thoughts about what should be included.

After class work and individual research what do you now understand the materials, procedures and variables of a laboratory report investigation should include?

Task 1: Part C – Safety:

Identify general good practice as expected in a scientific laboratory.

Describe and explain the importance of a risk assessment as used in a scientific investigation.

Provide an example of a suitable risk assessment for an A level standard investigation clearly demonstrating detailed knowledge and understanding of the risks, hazards, precautions and how to safely deal with potential accidents.

What do you initially understand should be included in a scientific laboratory report safety assessment? Describe below your initial thoughts about what should be included.

After class work and individual research produce a safety poster to demonstrate what you now understand should be included in a scientific laboratory report safety assessment?

Task 1 – Word Count =

Explain the difference between a chemical change and a physical change.Whereas there are some outward signs of a chemical change, many of these can be mimicked by physical changes (e.g., a change in color). What are some more reliable ways by which a chemical change can be distinguished from a physical change?

Laboratory Questions

Explain the difference between a chemical change and a physical change.

List three examples of physical changes and three examples of chemical changes. Explain why these are chemical or physical changes.

In the following scenarios, tell whether the change being described is a physical or a chemical change, and explain the reasoning behind your answer.

A carbonated beverage container is opened, producing a fizzing sound and carbon dioxide (CO2) bubbles.

Dry ice (solid CO2) is taken from a freezer and placed in an ice bucket at room temperature. With time, the block decreases in size and is surrounded by a visible cloud.

A pastry chef adds a mixture of white vinegar (~5% acetic acid in water) and baking soda (sodium bicarbonate, NaHCO3) to the batter for a red velvet cake to create bubbles that make the cake rise.

A shiny, silvery iron nail turns reddish-brown when left exposed to the weather.

A chemical heat pack is manufactured by sealing water (H2O) and calcium chloride (CaCl2) in separate compartments of a container. When the two components are mixed, the CaCl2 dissolves in the water, producing a large amount of heat.

Draw a diagram depicting what happens to the atoms of elements or molecules of compounds when a chemical change occurs and when a physical change occurs. Explain how the changes differ.

Whereas there are some outward signs of a chemical change, many of these can be mimicked by physical changes (e.g., a change in color). What are some more reliable ways by which a chemical change can be distinguished from a physical change?

Identify and explain the independent, dependent and controlled variables in relation to a given experiment.

Calculating the concentration of an acid

AC3.1 Outline the procedure of an experiment, including an accurate method and list of materials.

AC3.2 Identify and explain the independent, dependent and controlled variables in relation to a given experiment.

AC4.1 Present data clearly and accurately with the use of appropriate tables and graphs.

AC4.2 Interpret scientific results and identify potential sources of error, uncertainties, and anomalies.

AC4.3 Critique experimental design andprocesses within a given experiment

AC4.4 Offer suitable recommendations and improvements that can be implemented in future experimental work.

Accuracy is gauged by comparing the measured value of a known standard to its true value. Assuming the mass of the water represents a standard for the true volume of water, which piece of glassware has the highest degree of accuracy? Why?

Measurement and Uncertainty

Suppose you continued Activity 1 using a third plastic cup of the same type. Would you expect the average deviation from the average mass to be the same or different? Explain your answer.

Which piece of glassware has the highest degree of precision? Why?

Accuracy is gauged by comparing the measured value of a known standard to its true value. Assuming the mass of the water represents a standard for the true volume of water, which piece of glassware has the highest degree of accuracy? Why?