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Sphinxa [80]
3 years ago
8

1.)Which is the correct order of the organization of the human body?

Chemistry
2 answers:
Darina [25.2K]3 years ago
6 0
Answers:
1. A
2. D
3. B
steposvetlana [31]3 years ago
3 0
1. A
2.D
3.B

I think these are all right
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A solution of K2SO4 and KCl is added to a solution of Ba(NO3)2. Which of these compounds will precipitate out of this combined s
Archy [21]

A solution of K2SO4 and KCl is added to a solution of Ba(NO3)2. BaS0₄ (s) will precipitate out of this combined solution.

Molecular equation

K2SO4(aq) + Ba(NO3)2(aq)  → BaSO4(s) + 2 KNO3(aq)?

This equation represents a double displacement (replacement) reaction, also called a metathesis reaction, in which the reactant ions exchange places to form new products. The general equation is:

A-B + C-D → A-D + C-B;

where A and C are cations, and B and D are anions.

Complete ionic equation: Includes all ions and the precipitate.

2K^+(aq) + SO4^2-(aq) + Ba^2+(aq) + 2[NO3]^-(aq) → 2K^+(aq) + 2[NO3]^- + BaSO4(s)

In an aqueous solution, precipitation is the process of transforming a dissolved substance into an insoluble solid from a super-saturated solution.

The solid formed is called the precipitate. In case of an inorganic chemical reaction leading to precipitation, the chemical reagent causing the solid to form is called the precipitant.

Learn more about precipitation here : brainly.com/question/1783904

#SPJ4

6 0
1 year ago
An acid sample of an unknown concentration is contained in a erlenmeyer flask. Which technique below would be best suited to ana
Ivenika [448]

Answer:

Titration

Explanation:

The best technique which can be used to determine the number of moles of the HCl in the sample is titration.

The given amount of HCl solution must be titrated with known concentration of the base like NaOH.

The volume of NaOH required must be noted also.

According to the reaction,

NaOH+HCl\rightarrow NaCl+H_2O

At equivalence point

Moles of HCl = Moles of NaOH

Considering:-

Moles of HCl=Molarity_{NaOH}\times Volume_{NaOH}

Thus, in this way, moles of HCl can be determined.

4 0
3 years ago
Matter is composed of basic substances called what
Andreyy89
The basic substances are called elements
5 0
3 years ago
Read 2 more answers
Calculate the ph of a buffer that is 0.225 m hc2h3o2 and 0.162 m kc2h3o2. the ka for hc2h3o2 is 1.8 Ã 10-5. 4.60 9.26 4.74 4.89
Stella [2.4K]

Answer:

The pH of the buffer solution is 4.60.

Explanation:

Concentration of acid = [HC_2H_3O_2]=0.225 M

Concentration of salt = [KC_2H_3O_2]=0.162 M

Dissociation constant = K_a=1.8 \times 10^{-5}

The pH of the buffer can be determined by Henderson-Hasselbalch equation:

pH=pK_a+\log\frac{[salt]}{[acid]}

pH=-\log[1.8 \times 10^{-5}]+\log\frac{0.162 M}{0.225 M}

pH = 4.60

The pH of the buffer solution is 4.60.

8 0
3 years ago
Read 2 more answers
1. Calculate the average atomic mass of iron if its abundance in nature is 15%-iron-55 and
blsea [12.9K]

The average atomic mass of iron : 55.85 amu

<h3>Further explanation </h3>

The elements in nature have several types of isotopes

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.

An atomic mass unit = amu is a r<em>elative atomic mass of 1/12 the mass of an atom of carbon-12. </em>

The 'amu' unit has now been replaced with a unit of 'u' only

Atomic mass is the average atomic mass of all its isotopes

atomic mass X = mass isotope 1 . % + mass isotope 2.% ...

The average atomic mass of iron

\tt =0.15\times 55+0.85\times 56\\\\=\boxed{\bold{55.85~amu}}

8 0
3 years ago
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