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3 years ago

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Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about a century ago?

1 answer:

enot [183]3 years ago

6 0

Answer:

Atoms of different elements can combine with one another in simple whole number ratios

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Which elements are diatomic?

BartSMP [9]

Answer:

1 6 7 9

Explanation:

8 0

2 years ago

Select the correct answer.

fiasKO [112]

Well what are the answers to those options

3 0

3 years ago

Read 2 more answers

Fill in the blanks:

lara31 [8.8K]

<span>A wave that moves the matter it passes through up and down is a A) Transverse Wave, and one that moves the matter forward and back is a D) Longitudinal Wave.

There are two main types of waves, transverse and longitudinal, and I remember them by thinking that the longitudinal wave moves the matter in a longitudinal way (so forward and backward), and the transverse is the wave that moves the matter up and down — <em>a</em><em>cross </em>(since transverse can mean "across") the wave.

Hope this helped!! xx
</span><span>
</span>

8 0

3 years ago

In a sample of UO 2, the uranium has been enriched so that 3.0% of it is 235U. How long could the fissioning of the uranium in t

8090 [49]

Explanation:

Molecular mass of $UO_{2}$ is the sum of molecular mass of U and $O_{2}$ molecule.

Molar mass of $UO_{2}$ = (238 + 32) g/mol

= 270 g/mol

Hence, in 1 kg there are 1000 grams. So, total number of atoms given molecules present in 1 kg will be calculated as follows.

$\frac{1000 g}{270 g/mol} \times 6.023 \times 10^{23}atoms$

= $2.229 \times 10^{24}$

Hence, number of $^{235}U$ = $\frac{3}{100} \times 2.229 \times 10^{24}$

= $6.69 \times 10^{22}$

Now, let x seconds is required for burning 100 W lamp bulb. As 200 MeV is released per reaction.

100 x = $6.69 \times 10^{22} \times 200 \times 10^{6} \times 1.6 \times 10^{-19}$

x = $21.4 \times 10^{9}$ sec

Converting this value of x into years as follows.

x = $\frac{21.4 \times 10^{9}}{3600 \times 24 \times 365}$

x = $6.8 \times 10^{2}$ years

Thus, we can conclude that fissioning of the uranium in given situation requires $6.8 \times 10^{2}$ years to keep a 100 W lamp burning.

6 0

3 years ago

A given volume of methane diffuses in 20 seconds How long will it take the

yan [13]

Explanation:

Relative molecular mass of CH4 = 12 * 1 + 4 = 16

Relative molecular mass of SO2 = 32 + 10 *2 = 64

tSO2/tCH4 = √MSO2/MCH4

t/20 = √64/16 = √4

t/20 = 2

∴ t = 20 * 2 = 40sec

8 0

3 years ago