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3 years ago

What is the atomic number and weight of Potassium?

Chemistry

1 answer:

il63 [147K]3 years ago

5 0

Answer:

Atomic Number: 19

Approximate Weight: 39.10 g/mol

Element: Alkali Metal

Explanation:

The Periodic Table of Elements gives these 3 information already.

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1. Oxygen full electron configuration

Arada [10]

Answer:

$1s^{2} 2s^{2} 2p^{4}$

Explanation:

Oxygen has eight eletrons and six valence electrons, giving it the electron configuration of $1s^{2} 2s^{2} 2p^{4}$ .

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3 years ago

The use of lead paint in houses was banned in 1978 due to the health hazards associated with lead, specifically that high levels

arlik [135]

Environmental Chemistry studies the health hazards associated with lead, which is dangerous to humans.

Environmental Chemistry studies chemicals present in air, water and soil and their impact on humans and their environment.

Now, it was discovered that even low doses of lead particles in the paint when inhaled or ingested caused damaging effect to the body such as Impaired balance, seizures, ataxia and even death.

With the role of Environmental chemists in thier research and findings, the world has been informed on the negative effect on the expose of lead and other heavy metals like it to man and his environment.

See more here:brainly.com/question/22517940

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3 years ago

Mountains and valleys are some of the features found in the layer of rock at Earth's surface called the

loris [4]

Answer:

Narrow

Explanation:

Narrow

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3 years ago

An environmental scientist developed a new analytical method for the determination of cadmium (cd^2+) in mussels. To validate th

Anettt [7]

Answer:

The method is accurate in the calculation of the $Cu^+2$

Explanation:

As a first step we have to calculate the average concentration of $Cu^+2$ find it by the method.

$\frac{0.782+0.762+0.825+0.838+0.761 }{5} =0.79 ppm$

Then we have to find the standard deviation:

$s=\sqrt{\frac{1}{N-1}\sum_{i=1}^N(x_i-\bar{x})^2}=0.0359$

For the confidence interval we have to use the formula:

μ=Average± $\frac{t*s}{\sqrt{n} }$

Where:

t=t student constant with 95 % of confidence and 5 data=2.78

μ= $0.79$ ± $\frac{2.78*0.0359}{\sqrt{5} }$

upper limit: 0.84

lower limit: 0.75

If we compare the limits of the value obtanied by the method (Figure 1 Red line) with the reference material (Figure 1 blue line) we can see that the values obtained by the method are within the values suggested by the reference material. So, it's method is accurate.

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3 years ago

How many moles of water are produced from 13.35 mol of oxygen?

Over [174]

26.7 moles of H2O
that is my answer to this

8 0

3 years ago