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natima [27]
3 years ago
10

The main function of the circulatory system (at least a paragraph)!

Chemistry
1 answer:
SIZIF [17.4K]3 years ago
5 0
The circulatory system moves blood in our bodies. The blood can move oxygen and nutrients to our muscles and limbs. The heartbeat pushes the blood, and the blood cells carry glucose. 
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Complete the mechanism for the cleavage of the ether by adding any missing atoms, bonds, charges, nonbonding electrons, and curv
Anna [14]
This reaction is known as Acidic Cleavage of Ether. Ether when treated with strong acid like HI, the oxygen atom of ether picks the proton making a positive charge on oxygen. The Iodide conjugate base formed acts as a nucleophile and attacks on the carbon next to positive oxygen and forms Alkyl Halide. This is a type of SN² reaction. The complete reaction with missing atoms, charges and arrows is shown below,

5 0
3 years ago
Suppose that an element has two isotopes. The average atomic mass of the element is 45.737 u . One isotope has a mass of 40.149
Ugo [173]

Answer:

The answer to your question is 49.08 u

Explanation:

Data

Average atomic mass = 45.737 u

Isotope 1 = 40.149 u   abundance = 37.46%

Isotope 2 = ?

Process

1.- Calculate the abundance of isotope 2

abundance isotope 1 + abundance isotope 2 = 100%

                       37.46 + abundance isotope 2 = 100

                                    abundance isotope 2 = 100 - 37.46

                                     abundance isotope 2 = 62.54

2.- Calculate the mass of isotope 2

Average atomic mass = (abundance x mass isotope 1) + (abundance x

                                                                                            mass isotope 2)

45.737 = (0.3746 x 40.149) + (62.54 x mass isotope 2)

mass isotope 2 = [45.737 - (0.3746 x 40.149)]/ 62.54

mass isotope 2 = [45.737 - 15.0398]/ 62.54

mass isotope 2 = 30.6972/62.54

mass isotope 2 = 0.4908 x 100

mass isotope 2 = 49.08 u

7 0
3 years ago
Summarize the five points of Dalton’s atomic theory, and explain at least one change that occurred to the atomic theory because
Umnica [9.8K]
The postulates of Dalton's theory were:
1) Elements are made of extremely small particles called atoms
2) <span>Atoms of a given element are identical in size, mass, and other properties
</span>3) <span>Atoms cannot be subdivided, created, or destroyed</span>
4) Atoms combine in whole number ratio to form compounds
5) Chemical reactions are the rearrangement of atoms
The third postulate has been disproved by modern science, in which the atom has been split and been subdivided into smaller parts such as the neutron, proton and electron, which are further subdivided into quarks, gluons, and kaons.
The second postulate was also disproved upon the discovery of isotopes.
4 0
3 years ago
Read 2 more answers
You perform a single extraction with 100 mL of chloroform to remove compound A from 100 mL of an aqueous solution. The partition
Mice21 [21]

Answer:

Percentage of mass of solute in aqueous phase is 28.57%.

Explanation:

(q)_{aq}- Fraction of solute in aqueous phase.

(q)_{aq}=\frac{V_{aqueous}}{DV_{organic}+V_{aqueous})}

V_{aqueous} = Used volume of aqueous solution

V_{organic} = Used volume of organic solution

D = partition coefficient.

(q)_{aq}=\frac{100ml}{(2.5\times100)+100\,ml}=0.2857

Mass of solute in aqueous phase = 0.2857\times 5g=1.428g

Mass\,percentage = \frac{1.428}{5.0}\times 100=28.57

Therefore, Percentage of mass of solute in aqueous phase is 28.57%.

5 0
3 years ago
I need help FAST ASAP
kiruha [24]
In this item, we are simply to find the ions that may bond and are able to form a formula unit. We are also instructed to give out their name. There are numerous possible combinations of ions to form a compound. Some answers are given in the list below.

1.  Na⁺     ,    Cl⁻    , NaCl   ---> sodium chloride (this is most commonly known as table salt)

2. C⁴⁺       , O²⁻     , CO₂  ---> carbon dioxide

3. Al³+     , Cl⁻       , AlCl₃   ----> aluminum chloride

4. Ca²⁺     , Cl⁻     , CaCl₂    ---> calcium chloride

5. Li⁺        , Br⁻      , LiBr       ---> lithium bromide

6. Mg³⁺     , O²⁻      , Mg₂O₃   ----> magnesium oxide

7. K⁺        , I⁻          , KI   ---> potassium iodide

8. H⁺        , Cl⁻        , HCl  --> hydrogen chloride

9. H⁺        , Br⁻         , HBr ----> hydrogen bromide

10. Na⁺    , Br⁻         , NaBr   ---> sodium bromide
6 0
4 years ago
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