ENVR 101L calculations

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…

Based off information from the attachment, please help with #13 on second attachment

• Stock solution: 1000 mg/L Target sample concentrations: 50-400 mg/L • Create a 5-point standard dilution to cover the test • If each test only needs 10 mL, make plans to make the dilution so you have 20 mL of each concentration. ·

All of the work for this question has been done. The Professor asked an additional question that I am struggling with. The question is for part 3, “Why is there no nitrogen in the media?” Can you please explain? Thank you

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.

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Chemistry Hello! Can you please explain why these answers are wrong? Thank you.

FINAL Experiment 1- January 2021_-789644623 - Saved Layout Review View Table A friend of yours went panning for gold last weekend and found a nugget that appears to be gold. With your newfound scientific prowess, you set out to determine if it is really gold. Your tests show that the nugget has a mass of 7.6 g. Immersing the nugget in water raised the volume from 7.22 mL to 8.06 mL. The density of gold is 19.32 g/cm3. What will you tell your friend? acer

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A. FERMENTATION OF CANE SUGAR1. In a 500 mL Florence flask, place 50 gms of brown cane sugar and 1 gram ofdisodium phosphate.2. Dissolve 1 teaspoon of yeast in 15 mL of water. Add this to the sugar in the flasktogether with 150 mL water. Stir until the sugar is dissolved.3. Close the flask with a rubber stopper provided with a delivery tube so that theevolved gas will bubble through a solution of clear limewater.4. HAVE THE SET – UP CHECKED BY YOUR INSTRUCTOR.5. Keep the set – up inside the locker for 5 – 6 days at room temperature.Fermentation Set – up: ________________________________Write the equation for the hydrolysis of cane sugar _____________________________Write the equation for the fermentation of the simple sugars to alcohol __________6. At the end of the fermentation period, what is formed in the flask containinglimewater? _________________________________________________________________Write the equation for its formation ____________________________________________ C.…

Could you help me with question 2, please?

What animal can reproduce in large number. Is it Mosquito Frog Butterfly Cat Cockroache Dog

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Suppose that you heated the hydrated copper (II) sulphate in a test tube, instead of a beaker. How might this affect your results? 4 MAY 19 ... MacBook Pro & * %23 $ 2 3 4 5 6 7 E Y U G H J K C V M MOSISO command option command レー

Home Tools Lab Experiment #... x ... +) 玩, 1 | 2 97.4% Record your observations following each reaction including changes in color and state of matter. AGNO3 (Ag*) Pb(NO3)2 (Pb²*) Ca(NO3)2 (Ca²+) а e i NazCO3 Light orange solid white, cloudy solid white, cloudy, solid (СО2) b NaOH f dark brown solid stay clear, liquid white, cloudy solid (OH) g k NazSO4 stay clear, liquid white, cloudy, solid white, cloudy, solid (SO?) d NaCl 1 white, cloudy solid white, cloudy solid stay clear, liquid (CF) .... Remember to complete and submit this table to your instructor before the end of the class session.