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3 years ago

What is frequency a measure of ?

Chemistry

2 answers:

Kamila [148]3 years ago

6 0

Frequency is a measure of hertz

Alex_Xolod [135]3 years ago

6 0

Answer: The number of waves per second.

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Do wind up clocks need batteries? -like the non wired ones.

Sphinxa [80]

No, why? Cause if you're winding up the clock it's basically doing what it needs to do. So there's no need for batteries.. I hope my sad sentence make sense :p

6 0

3 years ago

Why is not used at nuclear plant as a soverce for electrical energy

nikitadnepr [17]

The biggest reason is radioactive wastes. Nuclear power generated radioactive wastes like Uranimum, plutonium and amercium that inhibits gene expression and causes cancer to the environment. Nuclear plants use to release these wastes into the oceans, and it causes fishes to exhibit gender change, 3 eyes, 2 tails etc. The impact on human shows signs of serious blood, liver and lung cancers.

There are currently no way to get rid of these wastes as they take hundred thousands of years to decompose.

Another reason is they cause a small amount of green gas emission. Releases CO2 to the sky. They exhibit radioactive gas emission as well (causes cancer) .

7 0

3 years ago

A solution is made by adding 29.1 mL of concentrated perchloric acid ( 70.5 wt% , density 1.67 g/mL ) to some water in a volumet

Lera25 [3.4K]

Answer:

The concentration of the solution is 1.364 molar.

Explanation:

Volume of perchloric acid = 29.1 mL

Mass of the solution = m

Density of the solution = 1.67 g/mL

$m=1.67 g/mL\times 29.1 mL=48.597 g$

Percentage of perchloric acid in 48.597 solution :70.5 %

Mass of perchloric acid in 48.597 solution :

= $\frac{70.5}{100}\times 48.597 = 34.261 g$

Moles of perchloric acid = $\frac{34.261 g}{100.46 g/mol}=0.3410 mol$

In 29.1 mL of solution water is added and volume was changed to 250 mL.

So, volume of the final solution = 250 mL = 0.250 L (1 mL = 0.001 L)

$Molarity=\frac{Moles}{Volume (L)}$

$=\frac{0.3410 mol}{0.250 L}=1.364 M$

The concentration of the solution is 1.364 molar.

6 0

3 years ago

How many of the following postulates of Dalton's atomic theory are still scientifically accepted? I. All atoms of the same eleme

Neko [114]

<h2>The required "options are (II), (III), and (IV)".</h2>

Explanation:

Postulates of Dalton's atomic theory which are scientifically accepted are:

Atoms are indestructible.
Compounds are combinations of different atoms.
A chemical reaction changes the way atoms are grouped together.

Postulates of Dalton's atomic theory which are not accepted scientifically are:

All atoms of the same elements are identical.

The theory states that the atoms of the same element are identical in every aspect but it is now scientifically proved that the same element should differ in their mass which is known as isotopes.

5 0

3 years ago

Elaborate on the role of activation energy in chemical reactions. A) Decreasing the activation energy leads to higher randomness

Zina [86]

B is right answer ithink bro/sis

4 0

3 years ago

Read 2 more answers