Are there any historical significance to Rosalind Franklin's contribution?

Answers

Answer 1

Answer: Rosalind Franklin made a crucial contribution to the discovery of the double helix ... Indeed, Franklin is in the shadows of science history, for while her work on DNA ... The two were to work together on finding the structure of DNA, but their ... No. This article has been posted to your Facebook page via Scitable LearnCast.

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Which statement correctly describes the charge of the nucleus and the charge of the electron cloud of an atom?(1) The nucleus is positive and the electron cloud is positive.
(2) The nucleus is positive and the electron cloud is negative.
(3) The nucleus is negative and the electron cloud is positive.
(4) The nucleus is negative and the electron cloud is negative.

Answers

Atoms are made of nucleus and electrons. Nucleus have a positive charge due to the presence of protons and electrons are negative in charge . Thus option 2 is correct.

What is an atom?

Atoms are the basic unit every substance. Atoms combines to form molecules and compounds. An atom is made of nucleus and surrounding electrons which are revolving through a circular path of fixed energy.

Nucleus is the core of the atom and the 90% of the weight of atom is centered in the nucleus and it contains positively charged protons and neutral particles neutrons.

The nuclear model of atom was first proposed by Rutherford. He found the positive cloud of the atom and and named as nucleus. He discovered the positively charged particles protons.

The net charge of an atom is zero because all the positive charges are neutralised by equal number of negatively charged particles electrons.

Therefore, the nucleus is positive and the electron cloud is negative and option 2 is correct.

To find more about atomic nucleus, refer the link below:

brainly.com/question/10658589

#SPJ2

The nucleus of an atom is positive, because it contains the protons (+1 charge) and neutrons (0 charge)
The electron cloud has a negative charge, because electrons have a -1 charge
So the answer is (2)

What is the [H+] of an HCl solution if the pH is measured to be 6? Select one: a. 1 X 10-7 M b. 1 X 10-6 M c. 6 X 10-6 M d. 8 X 10-1 M

Answers

Answer : The correct option is, $1* 10^(-6)M$

Explanation : Given,

The value of pH of HCl = 6

As we know that,

pH : It is defined as the negative logarithm of hydrogen ion or hydronium ion concentration.

The formula of pH is :

$pH=-\log [H^+]$

Now put all the given values in this formula, we get the concentration of hydrogen ion.

$6=-\log [H^+]$

$[H^+]=1* 10^(-6)M$

Therefore, the concentration of hydrogen ion is, $1* 10^(-6)M$

$pH=-\log_(10) [H^+] \Rightarrow [H^+]=10^(-pH) \n \npH=6 \n\ [H^+]=10^(-6)=1 * 10^(-6)$

The answer is B. 1 × 10⁻⁶ M.

How is the periodic table constructed ?

Answers

Before the periodic table, there were a bunch of symbols, number, letters etc (In all kinds of languages) that represented the elements. Scientists around the world saw that a chart of the elements needed to be universally accepted and finalized. A guy named Mendeleev presented this idea to the scientific community. Mendeleev was also the first to order elements according to atomic number rather than atomic weight. The modern day periodic table was not published by him, it was developed with the help of the entire scientific community. Honestly, there isn't a specific way to tell you how the periodic table was constructed, scientists developed thousands of tables that represented the elements. And just to let you know, the modern day periodic table is constantly going through changes as we discover more and more about elements, atoms, molecules etc. so in the near future it wouldn't be surprising if we saw something completely different than what we see today.

The Periodic Table is in order of electrons, and the columns are set up to show the amount of electrons in the outer most orbit.

Calculate the molecular mass of HCL

Answers

molecular mass of HCl :

H = 1.00794
Cl= 35.453

HCl :

1.00794 + 35.453 = 36.46094 g/mol

hope this helps!

The formation of rust is represented by the following reaction: 4Fe + 3O2 → 2Fe2O3 + energyIs this reaction exothermic or endothermic? How do you know?

Answers

Answer:

Exothermic

Explanation:

An exothermic reaction is defined as a reaction where heat/energy is released. In the formation of rust, iron reacts with oxygen gas to form ferric oxide and energy. Energy in the products side indicates a release of energy, thus making this reaction exothermic.

Carvone is a substance that occurs in two forms having different arrangements of the atoms but the same molecular formula (c10h14o) and mass. one type of carvone gives caraway seeds their characteristic smell, and the other type is responsible for the smell of spearmint oil. calculate the mass percent of each element in carvone.