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Explanation:

Rutherford’s laboratory showed that when alpha particles are fired into gas atoms, a few are violently deflected, which implies a dense, positively charged central region containing most of the atomic mass.

Answer: 1

Explanation:

The number of times a machine increases a force exerted on it The input force will be the same as the output force.

Answer:

84.2 grams

Explanation:

you have to multiply 8.42x10^18 to get the answer above

The number of the atom can be used to estimate the mass and moles of the substance by Avogadro's number. The mass of 8.42 x 10¹⁸ atoms of Bromine is equivalent to 0.0011 grams.

The mole concept has been the unit of the amount of estimating the mass of the substances with smaller entities. It uses the SI unit mol to measure the amount of mass. It also has been defined by 6.02214076 × 10²³ (Nₐ, Avogadro's number) elementary entities.

The molar mass of  Bromine (Br) is 79.904 u and atoms are 8.42 x 10¹⁸.

Atoms to mass are converted as:

= ( 8.42 x 10¹⁸ atom ÷ 1 ) × ( 1 mole Br ÷ 6.02214076×10²³ ) × (79.904 gm Br ÷ 1 mol Br)

= (8.42 x 10¹⁸ × 79.904 gm) ÷ 6.02214076 × 10²³

= 6.727 × 10²⁰ ÷ 6.02214076 × 10²³

= 1.117 × 10⁻³ grams

Therefore, 0.0011 grams is the mass of bromine.

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Answer:

A: Accurate Records

Explanation:

Answer:

He grouped elements with similar chemical and physical properties.

Hope this helps

Answer:

Energy sources do not have 100% efficiency because the processes of energy conversion to usable forms involves energy losses.

Some have lower efficiencies due to; energy losses in form of heat during conversion, poor technology applied during conversion of energy and lack of desire equipment to use in the energy conversion system.

Explanation:

The desired form of energy for use is derived from conversion of energy from the source using an energy converter into another form which is usable. The efficiency of the energy converter is calculated as;

л = output energy/input energy

The efficiency of energy is limited to the cost of equipment required for conversion from energy source by the energy converter to a form which is usable. Additionally, because energy sources are scarce, the technology to use in energy  conversion is a factor affecting energy efficiency in that high efficiency will require advanced technology with better equipment leading higher costs of that energy form. when heat losses are involved during energy conversion, efficiency lowers, thus its better if such losses are used as energy input in another system.

Answer:

boron

Explanation:

boron has 5 protons and carbon has 6, so if carbon lost a proton, it would become boron since each element has a unique number of protons.

As each element has a different number of protons, boron has five and carbon has six, so if carbon lost one of its protons, it would change into boron.

Every atom has a proton, a subatomic particle, in its nucleus. The particle possesses an electrical charge that is positive and opposite to the electron's.

In the reaction, a proton is forfeited. Keep in mind that when the number of protons changes, the atomic number also changes, creating a new element. Carbon-14 is the end result as a result. It is a new element, yet it has the same mass as nitrogen-14.

When carbon creates covalent bonds, pairs of electrons are shared between the atoms instead of being gained or lost as happens with chemical bonds. The ability of carbon to construct lengthy chains of atoms and so create intricate biological compounds is due in part to this feature.

Thus, If carbon lost one proton, boron atom would be formed.

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Answer:

Lemonade

Explanation:

Its a mixture of stuff to make a sweat drink :D

Answer:

This would be a phase change

Explanation:

Since the diffrent phases solid,liquid,gas are changing to other phases.

Sorry for the bad explanation.

Answer:

250

Explanation:

all you have to do is divide them its simple division cause its by the volume by the density

Mass can be calculated by using moles which can be further calculated from multiplication of Molarity to volume. The mass of sugar to make this solution is  8.6 kg.

Molarity can be calculated by dividing  number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/litre. It measure the concentration of any solute in a solution.

Other concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution

Mathematically,

Molarity= number of moles of solute/volume of solution in litre

Where,

moles= given weight /by molecular weight

         = w/ 96.0858

Substituting values in equation 1

0.6=(w/96.0858)/(150 )

w=8.6 kg

Thus the mass of sugar is 8.6 kg.

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Answer:

20322

Explanation:

Ionization Trend: First ionization energy will increase left to right across a period and increase bottom to top of a family (column).

If we compare Mg and Cl:

Mg is column 2 (far left) in the periodic table, while Cl is column 17 (far right). Based on the ionization rule explained above, Cl will have the higher first ionization energy.

Answer:      The theory of plate tectonics tells us that the earth's surface sits on plates that shift due to the built up pressure underneath. When the pressure gets too much, it has to escape somewhere so it goes to the edges of the plate and causes earthquakes. This in turn causes the surface to shift.

Answer:

19, K, 39.098

Explanation:

Potassium is a chemical element with symbol K and atomic number 19.

Atomic Mass: 39.098u

Explanation:

There is a trend in the periodic table.

I.E increases up the group and across the period. So you know that metals have less I.E compared to non-metals.

Answer:

Last one

Explanation:

Answer:

Boiling point!

Explanation:

Distilled water is capable of being heated beyond the normal boiling point due to absence of dissolved impurities which provide nucleating points at the normal boiling point.

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Answer:

It has the most quantitative effect on the average atomic mass of the element.

Explanation:

Tungsten's most common isotope will have the most quantitative effect on the average atomic mass.

The most common isotope of tungsten will represent its most abundant isotope.

The isotope with the most geonormal abundance will have the highest effect on the average atomic mass of an element.

it doesn't repopulate as fast because ecosystem 2 could have more trouble reproducing then ecosystem 1.

Answer:

B

Explanation:

The attraction is stronger when the magnet is closer so moving it away would decrease the strength.

Answer:because some have more radiation than others causing mutations and there for either decreasing or increasing the amount of ions

copper is a acidic metal in general therefor it will most likely erode faster than any other metal making it hard to determan the number of ions in general the metal will have basicly what I’m trying to say is there is no solid answer as many metals can change there ions for no given reason

Explanation:

im just answering questions to get points Explanation:

i dont know what points do

Answer:

Hello I passed my Chemistry exam (Acellus) in the beginning of June:)

Explanation:

Answer:

yes there is...........

Answer:

b

Explanation:

identify objects.

There are 3 significant figures in 20600.

Explanation :

As we know that Mendeleev arranged the elements in horizontal rows and vertical columns of a table in order of their increasing relative atomic weights.

He placed the elements with similar nature in the same group.

According to the question, the atomic weight of iodine is less than the atomic weight of tellurium. So according to this, iodine should be placed before tellurium in Mendeleev's tables. But Mendeleev placed iodine after tellurium in his original periodic table.

However, iodine has similar chemical properties to chlorine and bromine. So, in order to make iodine queue up with chlorine and bromine in his periodic table, Mendeleev exchanged the positions of iodine and tellurium.

As we know that the positions of iodine and tellurium were reversed in Mendeleev's table because iodine has one naturally occurring isotope that is iodine-127  and tellurium isotopes are tellurium-128 and tellurium-130.

Due to high relative abundance of tellurium isotopes gives tellurium the greater relative atomic mass.