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STANDARD SAMPLE PREPARATIONS FOR ABSORBANCE & CONCENTRATION DATA Concentration of stock nickel sulfate hexahydrate solution = .400 Molarity Sample Volume Absorbance Concentration (In Molarity) a 5 mL .179 10 mL .329 15 mL .588 20 mL .760 25 mL .939 Reference Blank = 0 Please show how to find Molarity, please show steps. Thank you and stay safe.

QUESTION 6 Rubbing alcohol is 70.% (m/v) isopropyl alcohol by volume. How many mL of isopropyl alcohol are in a 1 pint (473 mL) container? O A) 70. mL OB) 0.15 mL O C) 680 mL OD) 330 mL QUESTION 7 Click Save and Submit to save and submit. Click Save All Answers to save all answers. ( SAMSUNG

Name Date Chapter Performance Task (continued) 8 5. The new pool also needs a cover. Use the Areas of Similar Polygons Theorem to calculate how much material will be required to make the cover for the new pool. 6. A safe amount of chlorine in pools must be strong enough to kill bacteria but not so strong that swimmers' skin and eyes are irritated. Your target is 1 milligram of chlorine per liter of water. a. The Olympic-size pool is 3 meters deep across its entire length. Calculate volume of the pool in both cubic meters and liters (1 cubic meter = 1000 liters). b. How much chlorine (in kilograms) is needed for the Olympic-size pool? c. Explain how you can use similarity to calculate how much chlorine is required for the new pool. d. How much chlorine (in kilograms) is needed for the new pool? Geometry Performance Task 4 Copyright © Big Ideas Learning, LLC All rights reserved.

S Window Help DEC 15 Choose BEST answer from drop-down menu a) increases. b) decreases. c) remains the same. d) cannot be determined. When the concentration of a solution increases, the absorbance of light by the solution: Choose docs.google.com Choose BEST answer from drop-down menu a) pipette b) beaker Post Attendee - Zoom Match the equipment picture with the correct name. Choose c) Erlenmeyer flask d) graduated cylinder átv J (CC 2 TIE A 0

Based on the data given answer questions. 1,3, and 5 please ?? Question 2 is already answered to solved 1 and 3 1. Based on your three trials, discuss the precision of your data 2. The actual concentration of the unknown is 0.200 M. (Check with instructor to ensure that this value is accurate.) Calculate the percent error based on the average molarity of your three trials. Answer: Actual Molarity= 0.200M Mcalculated = 0.1755M % error = ( [actual - calculated value]/actual ) *100 Putting values; = ((0.200 - 0.1755)/0.200 )*100 = 12.25% 3. Based on your answer to (2), discuss the accuracy of your data. 5. 80.0 mL of 0.30 M NaOH and 80.0 mL of 0.30 M HCl are mixed together. What is the approximate pH of the solution —acidic, basic, or neutral? Explain.

MULTIPLE CHOICE: Choose the letter of the best answer Please answer all questions correctly 1. The standardization of volumetric solution does not require hydrochloric acid. A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E.All of the choices 2. In the standardization of its volumetric solution, the primary standard is dried to constant weight, which means drying shall be continued until two consecutive weighings do not differ by more than 0.50 mg. A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E.All of the choices 3. In the standardization of its volumetric solution, potassium iodide was added to A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E.All of the choices 4. Starch is the indicator of choice for these procedures because it forms intense blue coloration with the solution. A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E. C and D 5. In the standardization of its volumetric solution, the reaction needs to be…

1- Small bottles (500 water or soft drink bottles). 2- Balloons 3- about 500 mL of vinegar 4- About 50 g of baking soda (baking powder can be used) 5- small spoon Safety None of the chemicals used in this experiment are hazardous. Procedure 1. Use three dry empty water bottles (any size, lager size 0.500 L is better). Add around 100 mL (4 tablespoons). Make sure you label the bottle. 2. Place one teaspoon (or 5.00 g if you have kitchen scales) of sodium bicarbonate into first balloon, two teaspoon in the second and three teaspoon in the third. 3. Carefully attach one balloon to the top of each bottle or glass without letting any of the sodium bicarbonate tip out yet. 4. Tip the solid powder into the vinegar, making sure all of the solid powder is transferred down into the glass. 5. Record your observations in the corresponding sections in this document based on your experiments, then answer all questions. You will also need to take some photos and include them in this document. Please…

How can you use technology to enhance teaching and learning in a 5th grade classroom for a lesson on mixing substances based on the below standard and learning objective? (Optional: Use the SAMR model to explain the technology integration strategies you plan to use.) Standard Conduct an investigation to determine whether the mixing of two or more substances results in new substances. Learning Objective Given a variety of substances and safety equipment in a classroom setting, students will be able to conduct an experiment to mix two or more substances and observe the results. They will be able to correctly identify whether a new substance has been formed as a result of the mixing, based on observable changes such as color change, formation of a precipitate, or change in temperature, with at least 80% accuracy.

IA Read aloud Drav - 1 How can you separate a mixture of sawdust and powdered salt? A. mix properly with water, filter, and then evaporate mix properly with water, evaporate and then filter C. filter, mix properly with water and then evaporate D. It is not possible to separate a mixture of sawdust and powdered salt. В. A SHOT ON OPPO

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…

Activity 4: Aromatic Water Peppermint water (Simple solution method) Formula Peppermint oil ___ Purified water  ___ To make          60ml Materials: Erlenmeyer flask, filter paper Procedure: (Provide the procedure)

Help please

Bl pure substances, physically combined. Good examples of a solid mixture would be a salad or a bowl of trail mix. Solutions are mixtures too. A spoon full of sugar dissolved in water is an example of both a mixture and a solution. Because mixtures are physical combinations, they are easily separated. Here is a list of mixtures. Match the best method to separate the parts of each mixture. Boil the water. Collect the solid. ITEM BANK: Move to Top drag and drop answer here Dissolve salt in water. Pour through filter paper and collect the sand. Gravel and rocks drag and drop answer here Sand and gravel Remove iron filings with magnet. drag and drop answer here Sand and iron filings Sand and salt Use a screen to sift and separate the big pieces from smaller pieces. drag and drop answer here Sand and wood shavings drag and drop answer here Sugar water Pick out the bigger particles. drag and drop answer here Add water and float one type of particle. 53°F A O O a search 立

Please help with question 6

Before  Investigating the scene the technician must dilute the luminol solution to a concentration a 2.00 × 10-2 M. The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in 2.00L of the diluted spray?

LAB :DETERMINATION OF ALCOHOL CONCENTRATION IN WINE by distilling 1. How can we know that all the alcohol has distilled away from the wine? Explain. 2. Generate a graph “Temperature vs Volume of Distillate”. Was the temperature constant during distillation ? Explain why it should be so or not so

Sea X Assignments: ANATO X Gi 0220907135028396%20(1).pdf 2 CD Page view Human Anatomy X A Read aloud *20220907135028396 X TAdd text Draw 4 You prepare four solutions: Solution 1: Reactants + enzyme at #0 (about 100°F) and pH 7 Chemistry Check your recall lab. x V Highlight UNIT 2 65 3 Decompression sickness (also known as the bends) is a condition that affects divers and others operating under pressurized conditions. It occurs when gases such as nitrogen (N₂) come out of solution in the blood. This can lead to symptoms including joint pain, shortness of breath, and paralysis. Severe cases may result in death. a What type of molecule (ionic, polar covalent, nonpolar covalent) is nitrogen gas? b The liquid medium of blood is water. What type of compound (ionic, polar covalent, nonpolar covalent) is water? c What happens when molecules such as nitrogen gas mix with water? How does this explain the problems we see with decompression sickness?

Multiple choice. Please check my asnwers from numbers 5-9 if they are correct. Thank you!

Need detailed solution of abc if u don't know all parts please skip it