308_Exam 2_Spring 2023-V1-KEY-Canvas

Answer number 1-4 pls. I don't want to waste my money here.

how can i plot this data for concentration with depth?

This is my 2nd attempt to receive help with this problem. The previous expert confused me by saying the answer is less than 109.5? Does that mean it should be 90?  Please provide clarity instead of adding confusion; otherwise the payer loses a question for assistance.  Thank you.

For the image attached Draw a graph of the average mass vs. year. Make sure axes are labeled.

O STOICHIOMETRY Using the Avogadro Number A penny has a mass of 2.50 g and the Moon has a mass of 7.35 x 10“ kg. 22 Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of pennies? Round your answer to 3 significant digits. How many moles of pennies have a mass equal to the mass of the Moon? Round your answer to 3 significant digits. Explanation Check © 2021 McGraw-Hill Education. All Riahts Reserved. To átv

Scenario In an investigation, lab groups combine two compounds, as shown below. Based on the data collected from all lab groups, you realize that one group’s data was not possible.     Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)   External Data   Group Number Mass of Mg (g) Mass of HCl (g) Mass of MgCl2 (g) 1 5  15                                     20 2 5 15 17 3 5 15 21 4 5 15                                     20 5 5 15                                    19   Prompt  Make a claim about which group’s data is not possible. Use evidence and scientific reasoning to support your claim. Include a rebuttal in your answer.   Claim (1 sentence): ______________________________________________________________.   Evidence 1 (2-3 sentences):…

As viewed from Earth, most stars appear to move across the sky each night because A stars orbit around Earth   B Earth rotates on its axis   C stars revolve around the center of the galaxy   D Earth revolves around the sun

Consider the following choices when answering questions 86-89. b) d) 80 80 80 080808 808080 080808 808080 080808 D c. option c d. option d e. option e D 86. Which best represents a homogeneous mixture of an element and a compound? a. option a b. option b c. option c d. option d e. option e 89. Which best represents a heterogeneous mixture of two elements? a. option a b. option b

I don’t know where to start. I thought about doing 100-44.98 but that wouldn’t tell me as much.

In an experiment, calcium carbonate reacted with different volumes of hydrochloric acid in water. One of the products formed during the experiment was carbon dioxide. The time taken for 0.89 mL of carbon dioxide to form was recorded. A partial record of the experiment is shown. Flask Mass ofCalcium Carbonate Volume ofHCl Volume ofWater Time 1 4.0 g 25 mL 0 mL 11.2 seconds 2 4.0 g 20 mL 5 mL   3 4.0 g 15 mL 10 mL   4 4.0 g 10 mL 15 mL   Based on your knowledge of factors that affect the rates of chemical reactions, predict the trend in the last column of the experimental record. Use complete sentences to explain the trend you predicted. You do not have to determine exact values for time; just describe the trend you would expect (increase or decrease) and why it occurs

At room temperature, table sugar has a solubility of 200. g in 100 mL of water. In boiling water, solubility of sugar increases to 500. g/100 mL water.   A solution at room temperature contains 156 g of sugar/100 mL of water.   This solution must be _________.

Determine mass of cube. Record mass in Lab Data.

For the image attached make a graph of the average mass vs year. Make sure axes are labeled

3. Which process can separate a mixture of finely powdered iron and wheat flour? A. distillation 3. B. filtration C. using a magnet D. sieving E. sublimation

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1a) A children's liquid medicine contains 100 mg of the active ingredient in 5 mL. If a child should receive 200 mg of the active ingredient, how many milliliters of the medicine should the child be given? For the purposes of this question, assume that these numbers are exact.  1b)The package states that one teaspoon (tsp) is approximately equal to 5 mL. Calculate the number of teaspoons that the child should receive. Use the given approximation as your conversion factor.