Crystallography Homework

Dangerous Paint Stripper Jessica has a summer job working for the city parks program. She has been using a cleaner called “Graffiti Gone” to remove graffiti from the bathrooms. She has to take a lot of breaks, because the chemical makes her throat burn. It also makes her feel dizzy sometimes, especially when the bathrooms don’t have very many windows. On the label, she sees that the cleaner has methylene chloride in it. She feels like she’s managing to get the work done, but she is worried about feeling dizzy. She wants to find out more about this chemical, what harm it can cause, and whether there are safer ways to do this work. Questions for following story. 1. What went right in this situation? 2. What went wrong in this situation? 3. What steps should be taken in this workplace to make sure employees are better protected and prepared the next time?

Please answer the table. thank you so much

PLEASE MAKE SURE THAT YOU ARE ANSWERING THE QUESTIONS USING YOUR OWN THOUGHTS. STRICTLY NO COPY PASTE PLEASE! Answer each questions in not less than 2 paragraphs: 3. Explain the Synthesis/Combination Reaction. 4. Explain the Metathesis/Double Replacement Reaction.

THIS CAN NOT BE HAND DRAWN!

write a chemical reaction scheme for the synthesis of salicylic acid from wintergreen based on the information provided below. Include the balanced chemical equation for the reaction being studied or conducted (reactants to products). indicate actual chemical structures that pertain to the experiment and indicate conditions as well as solvents over and under the reaction arrow.

What is the main purpose of recrystallisation? A. Chemists recrystallise solids when they want to change big crystals into small crystals. B. Chemists recrystallise solids that are contaminated with impurities. If done properly, the solid will then recrystallise in a purer form. C. Chemists recrystallise solids when they want to change small crystals into big crystals.

can you please answer the question on the picture, make sure to show all of your work and POST PICTURES OF ALL OF YOUR WORK. Thank you.

Procedures: 1. Place a piece of colored paper in a pan then pour a drop of bleaching agent (chlorox). Observe what happens. 2. Open the soft drinks then put the mentos inside the bottle. Observe what happens. 3. Get a piece of paper and lift it up using the matchstick. Observe. Guide Questions: 1. What happened to the colored paper? 2. What is formed in coke after putting the mentos? 3. What is formed when you lift the paper?

Dr. Wong's assistant made the observations below while heating a sample of solid hydrogen. Using the data and observations in the table below, create a heating curve for hydrogen that Dr. Wong can reference during his laboratory testing. Be sure to include and label the following items in your heating curve: Create temperature and time intervals that are appropriate for the data. Don't start the temperature on the graph at 0 °C because the time intervals will be too large for the hydrogen data. Label the melting and boiling points on the curve. Label the three states and the two transition phases on the curve.   Heating data: Time (Minutes) Observations 0:00 Hydrogen is a solid at −263 °C. Heat is added to sample. 2:43 Hydrogen begins to change into a liquid at −259 °C. 6:15 Temperature of the liquid begins to increase. 10:36 Hydrogen begins to form a gas at −253 °C. 14:01 Temperature of the gas begins to increase. 18:00 Final temperature of hydrogen gas is −245 °C.

Dr. Wong's assistant made the observations below while heating a sample of solid hydrogen. Using the data and observations in the table below, create a heating curve for hydrogen that Dr. Wong can reference during his laboratory testing. Be sure to include and label the following items in your heating curve: Create temperature and time intervals that are appropriate for the data. Don't start the temperature on the graph at 0 °C because the time intervals will be too large for the hydrogen data. Label the melting and boiling points on the curve. Label the three states and the two transition phases on the curve.   Heating data: Time (Minutes) Observations 0:00 Hydrogen is a solid at −263 °C. Heat is added to sample. 2:43 Hydrogen begins to change into a liquid at −259 °C. 6:15 Temperature of the liquid begins to increase. 10:36 Hydrogen begins to form a gas at −253 °C. 14:01 Temperature of the gas begins to increase. 18:00 Final temperature of hydrogen gas is −245 °C.…

Predict the result of leaving the anhydrous crystals uncovered overnight.

Please send me the question in 20 minutes it's very urgent plz

Posttest Direction. Read the questions carefully. Write the letter of the correct answer. 1. Water exists in three states of matter and continuously moving through a cycle on Earth. At which stage in the water cycle does water transform from a gas to a liquid? a.evaporation c. precipitation b. condensation d. Sublimation 2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the…

You have the Major product it makes, so what is the product it comes from... There isn't much explanation to this... it's either you know it or you dont, and if you dont know it please pass it on the next person... I'm getting really tired of people declining questions because they dont know how to do it and they waste my time... I wait about 6-8 hours for my ONE QUESTION to get either answered or on Bartleby it mostly just Declinded and thats honestly such a waste of my time when you could have justed "SKIPPED IT" and let whoever comes in the next shift to see if they know how.. like For real...

Please give another example. Thank you

2. A MgCl2 stock solution that is 25 mM is provided by a PCR kit. We will prepare a 10 ul PCR reaction that needs to have a final concentration of 5 mM. How much of the stock magnesium chloride do we need to add to our PCR reaction?

PART 3- LABORATORY EQUIPMENT EQUIPMENT NAME FUNCTION To hold test tubes. Attaches to a retort stand to support glassware being heated. To pour liquid from a large container into a small container. To provide a flame during an experiment. ones To light the Bunsen burner. To attach test tubes to a retort stand. To clean substances out of a test tube. To hold a hot crucible or flask. To hold a hot test tube. To place on the lab bench to prevent burning or to use with ring clamp. To transfer small amounts of liquid. To grow bacteria or contain small experiments. To hold liquids. To measure liquids. To contain experiments (a stopper can be used to close the flask). To hold a hot beaker. To perform an experiment with a different substance in each well. To hold chemicals and perform experiments in. To scoop and transfer small amounts of substances, To stir during experiments that involve mixing or dissolving.

Arrange the following steps to explain how microwave oven cooks food. Write No.1-4 on the blank provided, 1 as the first step, and 4 is the last.   ___7. As microwaves pass through the food, they transfer energy to the water molecules in the form of heat. This will cook the food.___8. A part of the oven produces microwaves.___9. The microwaves are sent to the reflecting fan.___10. The microwaves are reflected in many directions by the fan and the walls of the microwave oven.​

What were the starting materials used in the synthesis of the thermochromic material? a. diethylamine HCl and isopropyl alcohol O b. Copper (II) chloride and absolute ethanol O c. diethylamine HCl and CuCl, O d. isopropyl alcohol and pure ethanol

When adding water to the sodium polyacrylate, the lab group next to you used tap water instead of deionized water. How would the amount of water that they will observe being absorbed compare to yours? Group of answer choices a. The other group will observe less water absorbed because tap water has a higher concentrations of ions present. b. The other group will observe less water absorbed because tap water forms hydrogen bonds more easily. c. The other group will observe less water absorbed because tap water is more attracted to sodium polyacrylate. d. The other group will observe more water absorbed because tap water has a higher concentrations of ions present. e. The other group will observe more water absorbed because tap water is more attracted to sodium polyacrylate. The other group will observe more water absorbed because tap water forms hydrogen bonds more easily. f. K DEC 23 útv ♫ ST اله

***DO NOT PLAGIARIZE FROM OTHER ANSWERS*** TOPIC: Preparation of Acetylene Question: How would you measure the yield of the acetylene gas?

Which tablet size and the liquid combination resulted in the fastest dissolution times?

Answer all Direction. Read the questions carefully. Write the letter of the correct answer. 1. Water exists in three states of matter and continuously moving through a cycle on Earth. At which stage in the water cycle does water transform from a gas to a liquid? a.evaporation b. condensation c. precipitation d. Sublimation 2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a…

Part A Identify each of the labeled points (indicated with letters) or changes (indicated with two letters separated by an arrow) shown on the phase diagram. 1.00- Pressure (atm) 0.50- A 0.10- F -150 -75 75 150 Temperature ("C)