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mario62 [17]
3 years ago
5

The results of Rutherford's gold foil experiment gave him the evidence to arrive at two conclusions: (1) an atom was much more t

han just empty space and scattered electrons and (2) ______________________________________________.
Chemistry
1 answer:
Vedmedyk [2.9K]3 years ago
7 0

Answer: The results of Rutherford's gold foil experiment gave him the evidence to arrive at two conclusions: (1) an atom was much more than just empty space and scattered electrons and (2) an atom consists of a positive charge at the center where most of its mass is placed.

Explanation:

Ernest Rutherford performed an experiment in which he passed alpha particles through a thin gold foil sheet. Through this sheet some of the particles passed on to the other side but some of them were reflected back.

This experiment was done by Rutherford to prove than an atom contains a tiny and heavy nucleus. He concluded that an atom has more than empty space and electrons were present in scattered form.

Also, he concluded that an atom consists of a positive charge at the center where most of its mass is placed.

Thus, we can conclude that the results of Rutherford's gold foil experiment gave him the evidence to arrive at two conclusions: (1) an atom was much more than just empty space and scattered electrons and (2) an atom consists of a positive charge at the center where most of its mass is placed.

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Calculate the number of atoms in 4g of bromine molecule.(Br).
KIM [24]

Answer:

\\ N=n * N_{A}

We do not have n - the amount of substance.

n=\frac{m}{M}\\

The molecular weight (M) of Bromine is 80.

n=\frac{4}{80} = 0.05 \text{ mol}

N = 0.05 * 6.02 * 10^{23} = 0.301 * 10^{23}

3 0
3 years ago
The _______________ system collects solid wastes—such as undigested food, intestinal bacteria, and old cells—and removes them fr
zmey [24]

Answer:

Excretory system, and Kidney.

Explanation:

The excretory system helps to regulate the chemical composition of the body fluids by removing metabolic waste such as undigested food, intestinal bacteria, and old cells and helping to retain the proper amount of water, nutrients, and salts in the body.

The main function of the kidney is to filter the blood, kidney help to remove waste from the body as urine, control fluid balance in the body, and keep the right level of electrolytes. Each kidney is bean-shaped in structure and 4-5 inches long in size.

6 0
3 years ago
Draw the Lewis Structure for H2O.
GalinKa [24]

Answer:

Structure has been shown below

Explanation:

  • In a Lewis structure, least electronegative atom is taken as central atom (except H)
  • Total valence electrons of constituting atoms are used to construct Lewis structure
  • A bond between two atoms are represented by a horizontal line or a dotted line (two dots).
  • Spatial rearrangement of atoms are neglected in Lewis structure.
  • H has one valence electron and O has six valence electrons. So, total valence electrons in H_{2}O are 8
  • Lewis structure of H_{2}O has been given below.

3 0
3 years ago
what are most of the needed formulas to find the molar volume and the molar concentration (Cm) 11th grade chemistry​
stealth61 [152]

Answer:

Explanation:

molar volume=moles*given volume

for molar concentration we use two formulas molarity and molality

molarity=no of moles/volume

molality=no of moles/kilogram

7 0
3 years ago
The half-life of gold-198 is 2.7 days. After
Pie

Answer: 8.1 days

Explanation:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant = x

a - x = amount left after decay process= \frac{x}{4} 

a) to find rate constant

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.693}{2.7days}=0.257days^{-1}

b) for completion of one fourth of reaction

t=\frac{2.303}{k}\log\frac{x}{\frac{x}{4}}

t=\frac{2.303}{0.257}\log{4}

t=8.1days

Thus after 8.1 days , one fourth of original amount will remain.

8 0
4 years ago
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