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2 years ago

What elements are solid liquid and gas at room temperature?

1 answer:

3 0

Elemental hydrogen (H, element 1), nitrogen (N, element 7), oxygen (O, element 8), fluorine (F, element 9), and chlorine (Cl, element 17) are all gases at room temperature, and are found as diatomic molecules.

Titanium, Lead, Potassium, and Silicon are solids at normal temperature.

Mercury and bromine (Br) are the only liquid elements at standard pressure and temperature (Hg).

<h3>What are chemical elements?</h3>

A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.

To learn more about chemical elements visit:

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What magnification will be produced by a lens of power –4.00 D (such as might be used to correct myopia) if an object is held 43

kiruha [24]

Answer:

The magnification is $m = 0.3674$

Explanation:

From the question we are told that

The power of the lens is $P = -4.00 D(dioptre)$

Generally $1 dioptre = 1 \ meter$

The object distance is $u = -43 \ cm$ the negative sign is because the distance is measured in the opposite direction of incident light (i.e away )

Generally the focal length is mathematically represented as

$f = \frac{1}{P}$

=> $f = \frac{1}{4.00 }$

=> $f = 0.25 \ m$

converting to cm

=> $f = 0.25 \ m = 0.25 * 100 = 25 \ cm$

Generally from lens equation we have that

$\frac{1}{f} +\frac{1}{v} -\frac{1}{u}$

=> $\frac{1}{25} +\frac{1}{v} -\frac{1}{-43}$

=> $v = -15.8 \ cm$

Generally the magnification is mathematically represented as

$m = \frac{v}{u}$

=> $m = \frac{- 15.8}{-43}$

=> $m = 0.3674$

6 0

2 years ago

What are the main ideas of physical science

Mademuasel [1]

Hysical science is defined as the study of observable phenomena in the universe.

the main idea of physical science is known as the "scientific method". 

this method states: 

observe a "real" ( not imaginary ) phenomena. 

make a hypothesis ( or theory / idea ) that EXPLAINS this phenomena. 

conduct a real experiment to test this hyothesis. 

confirm that the experiment validates the original hypothesis and if necessary amend the theory. 

it has worked so well that the very communication you are having with me is a result of the wonders of physical science.

3 0

2 years ago

It was a children versus grown-ups competition at school. One event required the adult to throw a basketball as far as he could.

aleksklad [387]

Based on Newton's Law, the event is not fair because:

No, because a basketball is bigger than a baseball, and objects that are bigger accelerate slower.

I hope my answer has come to your help. God bless and have a nice day ahead!

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3 years ago

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Describe the relationship between the Law of Conservation of Matter and balancing equations.

Yuliya22 [10]

Answer:

The mass of the products and reactants are the same on both sides of the equation.

The number of atoms of products and reactants are equal and hence it proves the law of conservation of mass.

3 0

2 years ago

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About how far does the S wave travel through Earth in 13 minutes?