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# Ursylla

Questions0
• ### Algebra 2?

you roll 2 dice. What is the probability that the sum of the dice is odd and both dice show the number 3?

• ### Chemistry Help! APEX?

B. A bolt of lightning strikes the ground 3.5 km (2.2 mi) away and is followed by a crack of thunder. Thunder has a frequency of around 100 Hz and a wavelength of approximately 3.5 m. Use this information to answer the following questions. (5 points)

i. How long does it take for the light to reach your eye? (2 points)

ii. What will the delay be between lightning flash and thunder boom? (2 points)

iii. Would low-frequency sound waves such as thunder most likely be studied using quantum mechanics or classical mechanics? What would be used to study lightning? (1 point)

• ### Lab Of Heats Reaction?

Questions

1. Which has a higher molecular weight: NaCl or CaCl2

?

How many ions does NaCl dissociate into? ________CaCl2

? ________

2. About how many moles of NaCl are in a cc (approximately 1.1g) of NaCl? ________

3. About how many moles of CaCl2 are in a cc (approximately 1.3g) of CaCl2

? _______ Even though you are not using exact ice measurements and a cc of either reagent is not an accurate measurement, you will still be able to interpret the data reasonably well.

Biochemists often have to interpret data with only approximate numbers.

4. Considering just the number of ions dissolved, can you account for the differences in temperature changes were seen Experiment 1 and Experiment 2?

Chemistry4 months ago
• ### How do I design my own expirement with this?

Design and perform your own experiment: Using two foam cups, with a foam cup cover and thermometer as a calorimeter, design an experiment that roughly determines the amount of heat that is used or produced when you dissolve:

a. 4 cc of salt (sodium chloride) in 40 mL of room temperature water.

b. 4 cc of calcium chloride in 40 mL of room temperature water

• ### Help Designing an Experiment!!?

I am not sure how to design an expirement out of this

• ### what would the reaction rate be for the following?

Rate = k[A]^2[B]^3

Rate constant = 1 x 10^-3 (L/mol)^4 / s

[A] = 3 M

[B] = 2 M