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seropon [69]
3 years ago
13

What is the main organ of the circulatory system?

Chemistry
2 answers:
Rainbow [258]3 years ago
7 0

Explanation:

your heart is the main organ of the circulatory system

steposvetlana [31]3 years ago
3 0
The heart are the main organ.
arteries, veins and capillaries are the one that travels blood around the body
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Lead ions can be removed from solution by precipitation with sulfate ions. Suppose a solution contains lead(II) nitrate.Write a
Alexxx [7]
The equation:
Pb(NO3)2 + K2SO4 = PbSO4 + 2KNO3
The ionic equation:
Pb^{2+} + SO4^{2-} = PbSO4
6 0
3 years ago
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Drag each label to the correct location on the image.
Mandarinka [93]

Answer:

<em>Uses energy: Amoeba and clock both use energy</em>

<em>Contains cells: true for the amoeba.</em>

<em>Lacks genetic material: true for a clock.</em>

<em>Reproduces: True for amoeba</em>

<em>Has internal organization: True for amoeba and clock both</em>

<em> </em>

Amoeba can be described as a single-celled organism and hence is a living thing. It will show characteristics of a living thing. Whereas, a clock can be described as a device to watch time. It is a non- living thing.  

7 0
3 years ago
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What is the molarity of 53.0 grams of HCl dissolved in 400.0 mL of water
Bond [772]

Answer:

Molarity = 3.625 M

Explanation:

Given data:

Mass of HCl = 53.0 g

Volume of water = 400.0 mL (400/1000 = 0.4 L)

Molarity of solution = ?

Solution:

Number of moles of of HCl:

Number of moles = mass/ molar mass

Number of moles = 53 g/ 36.5 g/mol

Number of moles =1.45 mol

Molarity:

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

Molarity =  1.45 mol / 0.4L

Molarity = 3.625 M

8 0
3 years ago
What’s the answer to this
Svetllana [295]

Answer:

B and D as well

Explanation:

All the electronic configuration of the elements of B end on s sub shell.

S energy level sub shell can hold 2 electrons and since Be, Mg, Ca Sr end in s.

We can say, they have same valence electrons, i.e 2 electrons.

6 0
2 years ago
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What is the energy of light with a wavelength of 468 nm? (The speed of light
marshall27 [118]

The answer for the problem is explained below.

The option for the answer is "D".

<u><em>Therefore the energy of the light is  4.25 × 10^-19 J</em></u>

Explanation:

Given:

wavelength (λ) = 468 nm = 468×10^-9 m

speed of light (c) = 3.00 x 10^8m/s

Planck's constant is 6.626 x 10^-34J·s

To solve:

energy of light (E)

We know,

E =(h×c) ÷ λ

E = ( 6.626 x 10^-34 ×  3.00 x 10^8) ÷ 468×10^-9

E = 4.25 × 10^-19 J

<u><em>Therefore the energy of the light is  4.25 × 10^-19 J</em></u>

6 0
3 years ago
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