All categories

4 years ago

Is this statement true or false?

Chemistry

1 answer:

CaHeK987 [17]4 years ago

8 0

Answer:

It is true

Explanation:

Remember that energy can not be created or destroy, it will only change depending the conditions that suffer an object.

In this explanation, a rubber that is still, it has inside it some energy stored, the one that it is called potential, and could be transformed in another kind of energy when is necessary like when the toothpick spin, is because this potential energy can be changed into mechanical energy to move the toothpick and make it spin, changing the potential energy into mechanical.

Hope this info is useful.

You might be interested in

Substance which allows energy to pass through it

Airida [17]

A substance which allows energy (heat or electricity) to pass through it is known as a conductor.

These substances usually have free electrons which allows the charges to flow easily in the substance, thus, transferring energy.

Other substances which do not have free electrons and do not allow energy to pass through them are known as insulators.

3 0

3 years ago

Which force holds together an atom's nucleus? a the strong force b the weak force c electromagnetism d gravity?

hichkok12 [17]

<span>a) The strong nuclear force

</span>

4 0

4 years ago

What is the energy of an electromagnetic wave with a electromagnetic wave with a frequency of 3 * 10 Hz ?

Olin [163]

Answer:

$E=1.989*10^{-32}J$

Explanation:

From the question we are told that:

Frequency $f=3 * 10 Hz$

Generally the equation for Energy of an electromagnetic wave is mathematically given by

$E=hf$

Where

h=Planck's constant

$h=6.62607015 * 10^{-34}$

Therefore

$E=6.62607015 * 10^{-34}*3 * 10$

$E=1.989*10^{-32}J$

8 0

3 years ago

Quinine (C20H24N2O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine

dolphi86 [110]

Answer:

The pH of saturated solution of the quinine is 10.05

Explanation:

Quinine (Q) is C20H24N2O2 has a molar mass of 324.4 g/mol

Q can behave as a weak base. Kb and pKb can be calculated for weak bases

pKb1 is to be considered when solving the question.

pKb1 = 5.1

Step 1 : Calculate the Kb of Quinine

pKb1 = - log [kb]

5.1 = - log [kb]

take Antilog of both side

[kb] = 7.94 x 10∧-6

Step 2: Calculate the concentration of saturated solution of Q in mol/dm3

From the question, 1900 ml of solution contains 1 g of Q

Therefore, 1000 ml of solution will contain........... x g of Q

x = 1000 /1900

x = 0.526 g in 1 dm3

In calculating concentration in mol/dm3,

Concentration in mol/dm3 = concentration in g /dm3 divided by molar mass

Molar mass of Q = 324.4

Concentration in mol/dm = 0.526 /324.4

= 0.0016 mol/dm3

Step 3: Calculating the Concentration of OH-

At Equilibrium, Kb = x² / 0.0016

7.94 x 10∧-6 = x² / 0.0016

x = √ 0.0016 × 7.94 x 10∧-6

x = 1. 127 × 10∧-4 mol/dm3

The concentration of OH- = 1. 127 × 10∧-4 mol/dm

Step 4: Calculating the pH of Quinine

Recall, pOH = - log [OH-]

pOH = - log [1. 127 × 10∧-4]

pOH = 3.948

Also recall that pH + pOH = 14

pH = 14 - 3.948

pH = 10.05

8 0

4 years ago

Mr. Greenjeans wants to know which fertilizer helps grow the biggest pumpkins. He plants three pumpkin seeds of the same variety

andrew11 [14]

A)Mr.Greenjeans needs a control group for comparison.
hope this helps

3 0

4 years ago

Read 2 more answers