_____________ can be described as the ‘skin’ on the surface of a liquid due to its cohesive forces.

Answers

Answer 1

Answer:

Answer:

surface tension

Explanation:

Answer 2

Answer: Surface tension

Explanation- Surface tension could be defined as the property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of the water molecules.

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Both sides pull with unequal force
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A ecosystem is ______ if it can continue to function over long periods of time

PLEASE ANSWERRRRRRTravels faster through air than metal.

electromagnetic wave, mechanical wave, or both.

Answers

Electromagnetic wave travels faster through air than metal.

Option A

Explanation:

There are different kinds of wave energy. The most significant are electromagnetic and mechanical waves. The mechanical waves propagate through the medium by transfer of energy by vibrating of particles in medium.

So, the more number of particles present in the medium, the more fast the mechanical wave can propagate. So the mechanical waves travel faster in metals consisting of more number of free charge carriers. But electromagnetic waves does not need any of the medium to propagate. So it can travel faster in air than in metals.

A reaction generates hydrogen gas (H) as a product. The re-actants are mixed and sealed in a 250.-mL vessel. After

20.0 minutes, 3.91 X 10-2 mol H, has been generated.

Calculate the average rate of the reaction.

Answers

Answer: The average rate of the reaction is $7.82* 10^(-3)M/min$

Explanation:

To calculate the molarity of hydrogen gas generated, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Moles of hydrogen gas = $3.91* 10^(-2)mol$

Volume of solution = 250 mL = 0.250 L (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

$\text{Molarity of }H_2=(3.91* 10^(-2)mol)/(0.250L)=0.1564M$

Average rate of the reaction is defined as the ratio of concentration of hydrogen generated to the time taken.

To calculate the average rate of the reaction, we use the equation:

$\text{Average rate of the reaction}=\frac{\text{Concentration of hydrogen generated}}{\text{Time taken}}$

We are given:

Concentration of hydrogen generated = 0.1564 M

Time taken = 20.0 minutes

Putting values in above equation, we get:

$\text{Average rate of the reaction}=(0.1564M)/(20.0min)\n\n\text{Average rate of the reaction}=7.82* 10^(-3)M/min$

Hence, the average rate of the reaction is $7.82* 10^(-3)M/min$

If stomach acid has a ph of 1.3, what is the pOH

Answers

I think the answer is -12.7

What types of atoms typically form covalent bonds?Metals with nonmetals, because their difference in electronegativity is above 1.7.
Metals with nonmetals, because their difference in electronegativity is below 1.7.
Nonmetals with nonmetals, because their difference in electronegativity is above 1.7.
Nonmetals with nonmetals, because their difference in electronegativity is below 1.7.
HELP!!!

Answers

Answer:

Nonmetals with nonmetals, because their difference in electronegativity is below 1.7.

Explanation:

Covalent bond is the bond which is formed with the sharing of the electrons between the two atoms which are taking part in the bond. It is generally formed between the atoms with similar electronegativity values.

It is the bond which is generally occurs within non metals as they share electrons to complete their octet.

The difference in the electronegativity values of the atoms involving in a covalent bond must not exceed the value of 1.7 .

Correct answer:- Nonmetals with nonmetals, because their difference in electronegativity is below 1.7.

Answer:

Nonmetals with nonmetals, because their difference in electronegativity is below 1.7.

Explanation:

The dude above got it right, and his explanation is sound, so instead of explaining, I can guarantee this is correct, because I took the 03.03 test.

4. What type of evidence do you think would be most difficult to collect

Answers

Answer:

The type of evidence that is more difficult to collect is evidence known as trace, for example, fibers, hair, or signs of dirt.

Explanation:

For the collection of this type of evidence, specialized equipment such as special vacuum cleaners, tweezers, etc. are used, all with the purpose of carrying out the collection of trace evidence. This type of evidence is characterized by being very difficult to find.

I think it is trace evidence since it is really small and hard to find.

if you have 0.5 grams of CaCl2 dissolved to make 15mL of solution, what is the molarity of the solution?

Answers

Answer:

0.3M

Explanation:

Molarity of a solution is given by;

M=n/v

Where;

n= number of moles of solute = mass of solute / molar mass

v= volume of solution

n= mass of CaCl2 / molar mass of CaCl2

Mass of CaCl2 = 0.5

Molar mass of CaCl2 = 40 + (2×35.5)

= 111g/mol

n = 0.5/111 = 0.0045mol

volume, v= 15mL = 15/1000 L = 0.015L

Note that molarity is in mole per liter, hence we convert 15mL to L. 1mL=1/1000L

M =0.0045/0.015

M=0.3mol/L

Therefore, the molarity of the solution is 0.3M

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