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RideAnS [48]
3 years ago
15

which example would most likely decrease friction? using cleats, rather than gym shoes, on a field using shaving cream, rather t

han shaving on dry skin using a wide parachute, rather than a narrow parachute, when skydiving using sandpaper, rather than regular paper, on wood
Chemistry
2 answers:
rosijanka [135]3 years ago
4 0
"<span>using shaving cream, rather than shaving on dry skin" I believe this is the answer. coz rest of them would increase friction rather than decrease</span>
Nataly [62]3 years ago
3 0

The answer is: using shaving cream, rather than shaving on dry skin.

Friction is the force resisting the relative motion of solid surfaces, fluid layers and material elements sliding against each other.

Shaving would be much easer using shaving cream, because friction is decreased.

This is example of decreasing skin friction.

Skin friction is the force resisting the motion of a fluid across the surface of a body.

Other examples cause increase of friction.

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9. Ibuprofen contain which of the following two functional groups: (1 point)
stira [4]

Answer:

A and C

I hope this helps you:)

4 0
3 years ago
What's the chemical formula for salt, like is it NaCl?? <br>the salt we eat???????​
MA_775_DIABLO [31]

yeah it's NaCl, I just looked it up

3 0
2 years ago
Read 2 more answers
How many moles is 1.50x10^23 molecules of NH3?
S_A_V [24]

 The   number  of moles that are  1.50  x10^23  molecules of NH3  are  

 =0.249 moles


       <u><em> calculation</em></u>

 The number of  moles is calculated  using  Avogadro's  law  constant

that  is  According  to Avogadro's  law

                         1  moles  of a  substance = 6.02 x10^23  molecules

                                    ?    moles                =  1.50  x10^23  molecules


by  cross  multiplication


= [( 1.50  x 10^23  molecules  x  1 moles) / (6.02 x10^23)]  = 0.249  moles

8 0
3 years ago
Read 2 more answers
4. a) The enthalpy change of combustion of hexane was measured using a calorimeter containing 200 cm3 of water; 0.5g of hexane (
mamaluj [8]

Answer:

The heat of combustion of hexane is -4324kjmol-1

Explanation:

Heat of combustion is the heat evolved when a mole of a substance is burned completely in oxygen under standard conditions.

To solve this problem, all the required values have been given.

Change in temperature ΔT = 30K

Mass of water =200cm3= 200g

Mass of Hexane burned = 0.5g

Step 1:

Find the amount of hear given off

Heat evolved= mass * specific eat capacity of water* temperature change

= 200 * 4.18 * 30

= 25080J

Step 2:

Calculate the relative molecular mass of hexane

RMM of C6H14 = 86g/mole.

Step 3:

Calculate the number of moles of Hexane burned

Numbrt of mole of hexane = mass / molar mass

n = 0.5 / 86

n = 0.0058mole

Step 4:

Calculate the enthalpy change of combustion for 1mole

Combustion of 0.0058mole hexane produces 25080J of heat energy

I mole hexane produces 25080 /0.0058

= 4324kJ of heat energy.

The enthalpy change of combustion of Hexane is -4,324kJmol-1.

There is no need to do anything else for the question.

7 0
3 years ago
What is the mass of 22.4 L of O2 at STP? (5 points)
egoroff_w [7]

Explanation:

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4 0
2 years ago
Read 2 more answers
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