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miskamm [114]
3 years ago
5

What did alexander fleming discover that earned him the 1945 novel prize of medicine?

Chemistry
1 answer:
Leviafan [203]3 years ago
6 0
He discovered penicillin
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the radius of magnesium atom is 0.160nm. the radius of a magnesium ion is 7.2x 10^-11m. explain the difference in size between t
Allushta [10]

Answer:

during reaction magnesium lises ions.

Explanation:

magnesium reacts by losing two ions which makes it smaller in size.

8 0
3 years ago
_______ waves occur when the motion of the medium is parallel to the direction of the wave.
Vika [28.1K]
Longitudinal. (just remember that Transverse waves are perpendicular. T is like an inverted perpendicular sign)
5 0
3 years ago
Kayla is creating a model to show her understanding of the water cycle. She wants to show that water is constantly cycling betwe
Orlov [11]

Answer:C

Explanation:

It would be the most visually understandable.It would be easyer to understand what you are modeling.

3 0
3 years ago
An atom of helium has two protons, two neutrons, and two electrons. its overall charge is _________. two zero four
Fofino [41]
Its overall charge is zero because it has 2 electrons 2 protons and 2 neutrons also it is zerovalent in nature as it is an inert gas
8 0
3 years ago
How many molecules are in a 189 g sample of carbon tetrabromide, CBr4 ?
anyanavicka [17]

Answer:

3.4 × 10²³ molecules of CBr₄

Explanation:

Given data:

Mass of CBr₄ = 189 g

Number of molecules = ?

Solution:

First of all we will calculate the number of moles.

Number of moles = mass / molar mass

Number of moles = 189 g/ 331.63 g/mol

Number of moles = 0.6 mol

Now the given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

Foe 0.6 moles of CBr₄:

0.6 mol × 6.022 × 10²³ molecules of CBr₄ / 1 mol

3.4 × 10²³ molecules of CBr₄

5 0
3 years ago
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