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4 years ago

35 POINTS!

Chemistry

2 answers:

Kobotan [32]4 years ago

3 0

Answer:

A: A boulder that is falling after being pushed off a cliff.

C: A pebble in a slingshot before it has been shot.

Explanation:

These are examples of potential energy because they are holding energy before it is released.

Hope this helps

Ann [662]4 years ago

3 0

Answer:

Your two answers would be 'An iron nail as it moves towards a magnet' and 'A pebble in a slingshot before it has been shot'.

Explanation:

Potential energy is energy stored for when the kinetic energy needs to be released. Kinetic energy is released when objects are in full motion.

Options A and D (The boulder one and the pebble traveling as it is shot) imply that the objects are moving and already using kinetic energy. Therefore, the other two options B and D, stated in the answer box, make the most sense.

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Sodium hydrogen carbonate NaHCO3, also known as sodium bicarbonate or "baking soda", can be used to relieve acid indigestion. Ac

olga2289 [7]

Answer:

1.4952 grams of sodium bicarbonate she would need to ingest to neutralize this much HCl.

Explanation:

$Moles (n)=Molarity(M)\times Volume (L)$

Moles of hydrochloric acid = n

Volume of hydrochloric acid solution = 200.0 mL = 0.200 L

Molarity of the hydrochloric acid = 0.089 M

$n=0.089 M\times 0.200 L=0.0178 mol$ of HCL

$HCl(aq)+NaHCO_3(aq)\rightarrow NaCl(aq)+H_2O(l)+CO_2(g)$

According to reaction, 1 mole of HCl is neutralized by 1 mole of sodium bicarbonate.

Then 0.0178 moles of HCl wil be neutralized by :

$\frac{1}{1}\times 0.0178 mol=0.0178 mol$ of sodium bicarbonate

Mass of 0.0178 moles of sodium bicarbonate:

0.0178 mol × 72 g/mol = 1.4952 g

1.4952 grams of sodium bicarbonate she would need to ingest to neutralize this much HCl.

8 0

3 years ago

Buck's Turf Care Company mowed 233 lawns over a 11 week period. What is the average weekly rate of mowing lawns?

masya89 [10]

Answer: 21 lawns per week

Explanation:

The average weekly rate refers to how many lawns were mowed per week given that 233 were done in 11 weeks.

Rate will be given by;

= Lawns mowed / Weeks taken

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= 21 lawns per week

6 0

3 years ago

.325 mol KOH to grams

lesya [120]

The answer is 18.23432 grams.

Molar mass of KOH= 56.1056

$( \frac{1 mol}{56.1056 grams}) (\frac{.325 mol}{x grams})$ = 18.234 grams

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3 years ago

3 points Given 0.65 moles KNO3: (a) Convert to grams (b) Convert to particles. <br>

Vlad [161]

Answer: Convert to grams

Explanation:

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3 years ago

What effect does rapid exhalation of CO2 during exercise have on the concentration of H2CO3 in the blood?

BARSIC [14]

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Hope it helped,

BioTeacher101

3 0

3 years ago

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