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love history [14]
3 years ago
5

What is physical and chemical changes in your own word?

Chemistry
2 answers:
mina [271]3 years ago
3 0
Physical is something you can see with your eyes Chemical is something you can not
ivann1987 [24]3 years ago
3 0

Answer:

physical is the change that doesn't effect the identity of the object chemical changes the identity of the object.

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What type of wave does not need matter to carry energy?<br> The answer is Electromagnetic
Aleks04 [339]

Answer:

Electromagnetic

Explanation:

Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

3 0
3 years ago
And Atom of which element has the largest atomic radius
Slav-nsk [51]

Answer:

Francium  

Step-by-step explanation:

Atomic radius increases from <em>right to left</em> in a Period and from <em>top to bottom</em> of a Group in the Periodic Table.

Thus, the atom with the largest atomic radius is in the <em>lower left corner</em>.

Francium, with an atomic radius of 348 pm, has the largest atomic radius of any element in the Periodic Table.

7 0
3 years ago
An acetaminophen suspension for infants contains 80 mg/0.80 mL. The recommended dose is 15 mg/kg body weight. How many mL of thi
omeli [17]
11 lb = 4.99 kg. 

So, 74.85 mg should be given to the infant. Thus 0.75 mL of the suspension should be given.
8 0
4 years ago
Read 2 more answers
Water is wet. true or false? Why?
Vikentia [17]

Answer:

True water is wet because when something is wet in this case it's water it has water on it at a molecular level. Water molecules are bonded on top of each other so it's wet.

5 0
3 years ago
A certain substance X condenses at a temperature of 123.3 degree C . But if a 650. g sample of X is prepared with 24.6 g of urea
Pavel [41]

Answer:

<u>The molal boiling point elevation constant is 1.59 ≈  1.6</u> Kkgmol^{-1}

Explanation:

To solve this question , we will make use of the equation ,

ΔT_{b} = i*K_{b} *m

<em>where , </em>

  • <em>ΔT_{b} is the change in boiling point of the substance X ( °C or K)</em>
  • <em>i is the Vant Hoff Factor which = 1 in this case ( no unit )</em>
  • <em>K_{b} is the mola boiling point elevation constant of X ( Kkgmol^{-1})</em>
  • <em>m is the molality of the solution which has (NH_{2})_{2} CO as the solute and  X as the solution (molkg^{-1})</em>

  1. ΔT_{b} = 124.3 -123.3 = 1 °C or K;
  2. i=1;
  3. m= \frac{moles of solute}{weight of solvent(kg)}molkg^{-1}

           ∴ m = \frac{\frac{24.6}{60} }{\frac{650}{1000} }

  • <em>as the weight of (NH_{2})_{2} CO is 60g and thus number of moles = \frac{24.6}{60}</em>
  • <em>and the weight of solvent in kg is \frac{650}{1000}</em>

    4. K_{b} ⇒ ?

∴

1=1*K_{b} *\frac{\frac{24.6}{60} }{\frac{650}{1000} }

⇒ K_{b} = 1.59 ≈ 1.6 Kkgmol^{-1}

4 0
3 years ago
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