Chemistry High School

what special equipment did niels bohr use to develop his atomic model?

Answers

Answer 1

Neil Bohr used the fluorescent screen and an alpha particle detector to study the structure of an atom.

What is an atom?

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

The atom as a whole is neutral and stable due to presence of oppositely charged particles.

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Related Questions

What makes a field forever unique?

Answers

From cotton fields to corn stalks, if this is what you mean, a forever field is unique in its own way by keeping all types of plants in the field. They are all different in how they grow and what they do.

Dna has an important role in making proteins, the biomolecules that help determine our traits as well as take part in chemical reactions throughout our bodies. Can you correctly label the steps/parts involved in protein synthesis?.

Answers

Protein synthesis is a process that is generated within cells where different organelles and genetic components are involved through which proteins are generated.

What are the steps of protein formation?

The biosynthesis of proteins will be given by different parts, beginning with the translation of the genetic material. It will be given by different steps:

1. mRNA binds to ribosomes and the aminoacyl-tRNA to be associated to the first codon of the mRNA is associated.

2. The elongation of the polypeptide chain occurs, in which the amino acids are joined

3. The elongation is finished when the termination codons are reached.

4. The translation components are released and post-translational modifications are started.

5. The folding, glycosylation and modification of amino acids occur

6. Finally, the protein is released to generate its function

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A science class is going to do an experiment to investigate how water temperature changes the rate at which salt dissolves in water. What tool will be needed to measure the temperature of the water?

Answers

Answer:

thermometers

Explanation:

Answer: thermometer

Explanation: trust me ;)

Which of the following concentration measures will change in value as the temperature of a solution changes?
1. mass percent
2.mole fraction
3. molality
4. molarity
5. all of these

Answers

The concentration measures will change in value as the temperature of a solution changes is molarity. The correct option is 4.

What is molarity?

The molarity of a substance refers to how much of it is present in a given volume of solution (M). Molarity is the measure of how many moles of a solute are present per liter of a solution. Molarity is also referred to as a solution's molar concentration.

To find the equation for molarity, divide the volume of solvent used to dissolve the given solute by the number of moles of that solute. M = n V

Since the volume of the solution rises as the temperature rises, molarity decreases. Therefore, molarity is normally affected when therefore is a change in temperature of a solution either when it increases or decreases.

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please help!

Are magnesium and calcium more reactive with oxygen in the air than is aluminum? Support your answer.

Answers

Magnesium and calcium are 2nd group elements with 2 valence electrons. They are metals in room temperature and easily lose these electrons to nonmetals such as oxygen.

What is magnesium ?

Magnesium is 12th element in periodic table. It is 2nd group element and is a called alkaline earth metals. Its group members are calcium, strontium, and barium.

They contains 2 valence electrons which can be easily lost to a non-metal. Oxygen is highly electronegative element and it contains 6 valence electrons and need two more electrons to achieve octet.

Al is 13th group element it is not as much electropositive as alkaline earth metals. It contains 3 valence electrons and thus it need to lose all these 3 electrons to achieve octet. Hence, Al is less reactive towards O2 in comparison with Mg and Ca.

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(50 points)
Diurnal temperature range is the difference between ________ and ________ temperature each _________.

high, low, hour
high, low, day
beginning, ending, hour
beginning, ending, day

Answers

Answer: Diurnal temperature range is the difference between __maximum______ and ____minimum____ temperature each ___1 day______.

Explanation:

How many moles exist in 3,000,000 particles of gold (Au)?​

Answers

Answer:

4.98 x 10^-18 mole

Explanation:

1 mole has 6.022 x 10^23 particles

so 3,000,000/(6.022 x 10^23) = 4.98 x 10^-18 mole

what quantity is needed to convert between the moles of a given sample of a substance and its mass in grams

Answers

The molar mass of the substance is needed to convert between the moles of a given sample of a substance and its mass in grams.

What is molar mass?

A compound's molar mass, which is measured in grams per mole, specifies how much of a given material weighs in one mole. In other terms, the molar mass is the sum of the masses of all the atoms that make up a mole of a certain molecule, expressed in grams. As a result, the molar mass is measured in grams/mole.

The compound's molar mass is expressed in grams per mole, or g/mol. The mass of 1 mol, expressed in the SI as g/mol, is the definition of the molar mass. Example: Water has a molar mass of 18.016 g/mol.

Thus, The molar mass of the substance is needed to convert between the moles of a given sample of a substance and its mass in grams.

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The complete question is as follows:

What quantity is needed to convert between the moles of a given sample of a substance and its mass in grams?

a the molar mass of the substance

b the density of the substance

с the physical state of the substance

d all of the above

Which of the following is an example of a heterogeneous mixture?
salad
milk
paint
toothpaste

Answers

Answer:

salad

Explanation:

which set of elements is arranged in order of increasing electronegativity? which set of elements is arranged in order of increasing electronegativity? ga < ge < p < n p < n < ge < ga ge < n < ga < p n < p < ge < ga

Answers

The electronegativity is n < p < ge < ga.

What is electronegativity?

Electronegativity is a measure of an atom's ability to attract electrons when it forms a chemical bond with another atom. It is based on the Pauling Scale, which assigns values to elements based on their tendency to attract electrons when they form bonds. Electronegativity increases from left to right across the periodic table, and increases from the bottom to the top of the periodic table.

The correct answer is n < p < ge < ga. This is because electronegativity increases as we move down a group in the periodic table and from left to right across a period.
Therefore, the element with the highest electronegativity is at the bottom right corner of the periodic table, which is gaseous, followed by Germanium, Phosphorus, and then Nitrogen.

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