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uranmaximum [27]
3 years ago
7

How can you distinguish A from B?

Chemistry
2 answers:
mel-nik [20]3 years ago
8 0

* Lab question: How can you distinguish a physical change from a chemical change?

> Format: How can you distinguish A from B?

Answer! Comparison: physical changes vs. chemical changes

Paul [167]3 years ago
4 0
I think we can distinguish A from B because they are totally different letters but bro what do you mean in what form of letters, is there supposed to be like an equation or something please tell me if there is so i can help you or whatever it is hope i can help you :)
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How many molecules of fructose would you have if you have 0.7 moles of<br> fructose?<br> *
iogann1982 [59]

Answer:

4.214 × 10^23 molecules.

Explanation:

Number of molecules in a substance can be calculated by multiplying the number of moles in that substance by Avagadro's number, which is 6.02 × 10^23.

That is, no. of molecule = n × Avagadro constant

In this case, there are 0.7 moles of fructose. Hence;

number of molecules = 0.7 × 6.02 × 10^23

no. of molecule = 4.214 × 10^23 molecules.

5 0
2 years ago
A radioactive nuclide that is used to label blood platelets has 49 protons and 62 neutrons. Which is the symbol of this nuclide?
Drupady [299]
From among the subatomic particles available, we determine which element is presented by using the number of protons. The 49th element in the periodic table is Indium (In). The chemical symbol is In-62. 62 is the number representing the number of neutrons .

Answer: In-62
6 0
3 years ago
Read 2 more answers
Hich one of the following statements about orbital hybridization is incorrect?
photoshop1234 [79]

Answer : The incorrect statement is, (C) The nitrogen atom in NH₃ is sp² hybridized.

Explanation :

Formula used  :

\text{Number of electron pair}=\frac{1}{2}[V+N-C+A]

where,

V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

Now we have to determine the hybridization of the following molecules.

(a) The given molecule is, CH_4

\text{Number of electrons}=\frac{1}{2}\times [4+4]=4

The number of electron pair are 4 that means the hybridization will be sp^3 and the electronic geometry of the molecule will be tetrahedral.

(b) The given molecule is, CO_2

\text{Number of electrons}=\frac{1}{2}\times [4]=2

The number of electron pair are 2 that means the hybridization will be sp and the electronic geometry of the molecule will be linear.

(c) The given molecule is, NH_3

\text{Number of electrons}=\frac{1}{2}\times [5+3]=4

The number of electron pair are 4 that means the hybridization will be sp^3 and the electronic geometry of the molecule will be tetrahedral.

But as there are 3 atoms around the central nitrogen atom, the fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be trigonal pyramidal.

(d) sp² hybrid orbitals are coplanar, and at 120° to each other.

The sp² hybrid orbitals has trigonal planar geometry and are in the same plane that means coplanar. Thus, the bond angle is 120° to each other.

(e) sp hybrid orbitals lie at 180° to each other.

The sp hybrid orbitals has linear geometry. Thus, the bond angle is 180° to each other.

Hence, the incorrect statement is, (C) The nitrogen atom in NH₃ is sp² hybridized.

4 0
3 years ago
An aqueous solution contains 3.6 mM of total ions.
jekas [21]

Answer:

The concentration of the chloride ion is 1.8 mM

Explanation:

Step 1: Data given

An aqueous solution contains 3.6 mM of total ions.

Step 2: The equation

NaCl(aq)  →  Na+(aq)   +  Cl-(aq)  :   two ions

Step 3: Calculate the concentration of the chloride ion

Two ions  = 3.6 mM

Chloride ion =  3.6/2 mM= 1.8 mM

Sodium ion = 3.6/2 mM = 1.8 mM

The concentration of the sodium ions is 1.8 mM

The concentration of the chloride ion is 1.8 mM

The total concentration = 3.6 mM

7 0
3 years ago
The pressure 75.0 meters underwater is 837 kpa. What is this pressure in mmhg
spin [16.1K]
<h3>Answer:</h3>

                 6278 mmHg

<h3>Explanation:</h3>

Kilopascal (kPa) and Millimeter of Mercury (mm Hg) are both the units of Pressure. In medical science the pressure is often measured in mm of Hg.

Also,

                 0.133322387415 kPa equals  =  1 mmHg equals

Then,

                       837 kpa will be equal to  =  X mmHg

Solving for X,

                     X =  (837 kPa × 1 mmHg) ÷ 0.133322387415 kPa

                     X  =  6278.0153898 mmHg

Or when rounded to 4 significant numbers,

                     X  =  6278 mmHg

7 0
3 years ago
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