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Alex787 [66]
3 years ago
15

Please help me with this question I will make you brainliest!! SCIENCE

Chemistry
1 answer:
schepotkina [342]3 years ago
5 0

Answer:

A skateboarder coming down the ramp.

When something is going up against ( up or <u><em>down</em></u> ) something it causes friction.

Hope this helps!

You might be interested in
Consider two acids: (ch3)3cco2h (pivalic acid, pka = 5.0) and hco2h (formic acid, pka = 3.8). Which acid is the stronger acid? S
Phoenix [80]
<h3>Answer:</h3>

            Formic acid is the stronger acid.

<h3>Explanation:</h3>

                   The strength of an acid is determined by the power of it to dissociate and produce H⁺ ions. Greater the dissociation of an acid, the stronger that acid is. Also, extent of dissociation for particular acid is given by its dissociation constant i.e. Ka.

The greater the Ka value, the stronger an acid is and vice versa.

Calculating Ka value of Pivalic acid:

As,

                                                 pKa  =  -log [Ka]

So,

                                                 Ka  =  10^-pKa

Putting value of pKa,

                                                 Ka  =  10⁻⁵

                                                Ka  =  1.0 × 10⁻⁵

Calculating Ka value of Formic acid:

As,

                                                 pKa  =  -log [Ka]

So,

                                                 Ka  =  10^-pKa

Putting value of pKa,

                                                 Ka  =  10⁻³'⁸

                                                 Ka  =  1.58 × 10⁻⁴

<h3>Conclusion:</h3>

                  As the Ka value of Formic acid is greater than Pivalic acid therefore, it is stronger acid than Pivalic acid.

<h2>TIP:</h2>

     When comparing strength of acids, the acid with the lowest pKa value is considered the strongest acid and <em>vice versa</em>.

8 0
3 years ago
Compare a heterogeneous mixture and a homogeneous mixture
yarga [219]
In a heterogeneous mixture, you can clearly see the distinction between the different substances within the mixture. e.g. fruit salad, paella, nachos

in a homogeneous mixture, it is still made up of different substances, but there is no way of distinguishing between them just from appearances. they have the same uniform composition throughout. e.g. salt water; you know it is made of salt and water, but the salt is dissolved uniformly throughout that you cannot tell. 

hope that helps :)
3 0
3 years ago
Cylinders of compressed gas are typically filled to a pressure of 200 bar. For oxygen, what would be the molar volume at this pr
mars1129 [50]

Answer:

a

 V  =   0.124 \ Liters

b

V  =  0.112 \  Liters

Explanation:

From the question we are told that

  The pressure of compressed gas is P  =  200 \  bar = \frac{200}{1.013}=  197.4 \ atm

  The  temperature is  T  =  25^oC =  25 + 273 = 298 \  K

Generally the perfect gas equation is mathematically represented as

     PV =  nRT

substituting 0.08206 L-atm/mol-K  for R and  1 mole for n

We have that

     V  =  \frac{1 *  0.08206 * 298 }{ 197.4}

       V  =   0.124 \ Liters

Generally the van der Waals equation is mathematically represented as

       nRT  =  [P + \frac{n^2 * a }{V^2 } ][V - nb]

=>1 *  0.08206 *298  =  [197.4 + \frac{1^2 *  1.364}{V^2 } ][V - 1 * 3.19 * 10^{-2}]

=>    V  =  0.112 \  Liters

7 0
4 years ago
What are the classifications of these compounds? Are they triglycerides?
Gala2k [10]

Answer:

Yes they are triglycerides

Explanation:

Triglycerides are esters derived from glycerol and three fatty acids.

If we look at the structures closely, we will notice that the compounds are composed of glycerol and three fatty acids.

Hence the structures are triglycerides. The first structure is an unsaturated triglyceride while the second structure is a saturated triglyceride.

6 0
3 years ago
What is the compound of HgS
qaws [65]

Answer:

Mercury sulfide or mercuric sulfide,

Explanation:

5 0
4 years ago
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