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3 years ago

Identify and explain exothermic and endothermic reactions in terms of energy transfer

1 answer:

5 0

Exothermic reaction is when the system releases energy to the surrounding, the energy (in the perspective of the system) will have a sign of negative, as the system is transferring energy towards the surrounding.

Endothermic reaction is when the system is absorbing energy from the surrounding, the energy (in the perspective of the system) will have a sign of positive, as energy is transferred to the system.

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Cyclohexane, a commonly used organic solvent, is 85.6% c and 14.4% h by mass with a molar mass of 84.2 g/mol. what is its molecu

puteri [66]

The molecular formula of organic solvent is <em>C6H12</em>

<h2>calculation</h2><h3>find the empirical formula first as in step 1 and 2</h3>

Step 1: f<em>ind the moles of C and H</em>

moles = % composition/molar mass

from periodic table molar mass of C= 12 g/mol while that of H= 1 g/mol
moles is C is therefore = 85.6/12= 7. 13 moles
moles of H= 14.4/1 - 14.4 moles

Step 2: <em>calculate the mole fraction by dividing each mole by smallest number of mole(7.13)</em>

that is C= 7.13/7.13 = 1

H= 14.4/7.13 =2

the empirical formula is therefore = CH2

<h2>Then calculate the molecular formula from empirical formula</h2>

step 3: divide the grams molar mass by empirical formula mass

empirical formula mass = 12+(1 x2) = 14 g/mol

= 84.2/ 14 = 6

step 4: multiply each of the subscript within the empirical formula with the value gotten in step 3

that is [CH2]6 = C6H12 therefore the molecular formula = <u>C6H12</u>

8 0

2 years ago

Does a low or a high pressure air mass have a greater atmospheric pressure than the surrounding air masses?

Ghella [55]

Answer:

Hello fellow brainlian! here is the answer that you seek:High pressure areas are usually caused by air masses being cooled, either from below (for instance, the subtropical high pressure zones that form over relatively cool ocean waters to the west of Califormia, Africa, and South America

Explanation:

Have a totally horse-some day!

With love,

-The one and only Alaska

8 0

2 years ago

Read 2 more answers

Most of the costs associated with using renewable resources are due to

saveliy_v [14]

Answer:

a. overuse of resources is the correct answer.

Explanation:

Renewable resources are available and they are abundant but overuse of these renewable resources will have a negative effect on the surroundings and humans.

Overuse of renewable resources will leads to the depletion of these renewable sources in the future and will also make the ecosystem unbalance.

Renewable resources are solar energy, geothermal energy, biomass energy, wind energy, hydro energy.

Thus renewable resources are threatened due to overuse and it must be carefully used.

6 0

3 years ago

Hey guys!

melamori03 [73]

Pajamas

Out fit for each day + 2 extra

Athletic clothes

Light hoodie

Bathing suit + cover up

Underwear

Socks

Bra's

Sunscreen

Moisturizer

Makeup

Makeup remover

Shampoo + conditioner

Shaving cream

Razor

Medicine (pain meds, etc.)

Lotion

Chapstick

Retainer (if you have 1)

Tooth brush + toothpaste

Deodorant

Monthly Items

Phone charger

Computer + computer charger

Camera + camera charger

Headphones

Water bottle

Snacks

Perfume

Book

Glasses

Purses

Jewelry

Watch

Wallet

Hat

Sunglasses

Hand sanitizer

Tennis shoes

Walking shoes

Flip flops

Blow dryer

Straightner

Hair clips

Hair ties

Hair brush

Hair spray

Heat protection

Have music + shows/ movies downloaded

Hope this helps you take off anything you don't want or anything you don't need

7 0

2 years ago

Cuales son las fórmulas de la velocidad

AnnZ [28]

Answer:

s = d÷ t

Explanation:

Where s means speed, d means distance and t means time

7 0

2 years ago