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CaHeK987 [17]
3 years ago
9

1 point

Chemistry
1 answer:
levacccp [35]3 years ago
4 0

Answer:

A pure substance has a definite chemical composition

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Why doesn't glass exhibit crystalline form
ser-zykov [4K]
It doesn't have a 3 dimensional pattern
7 0
3 years ago
You have a radioactive isotope with a mass of 400 grams. The sample has a half life of 5 days. How much is left after 25 days ha
Alexeev081 [22]

Answer:

Amount left after 25 days = 12.5 g

Explanation:

Given data:

Mass of sample = 400 g

Half life of sample = 5 days

Mass left after 25 days = ?

Solution:

First of all we will calculate the number of half lives passes in given time period.

Number of half lives = Time elapsed / Half life

Number of half lives = 25 days/ 5 days

Number of half lives = 5

At time zero = 400 g

At 1st half life = 400 g/2 = 200 g

At 2nd half life = 200 g/2 = 100 g

At 3rd half life = 100 g/2 = 50 g

At 4th half life = 50 g/2 = 25 g

At 5th half life = 25 g/2 = 12.5 g

4 0
3 years ago
which is a type of heat transfer that causes the air at the top floor of a building to be hotter than the bottom floor of a buil
bonufazy [111]

Answer: I believe it's convection

Good luck and I hope this helps!!

8 0
3 years ago
Please answer correctly !!!!! Will mark brainliest !!!!!!!!!!!!!!
wlad13 [49]

Answer: Solids

Explanation:

In the solid state, the individual particles of a substance are in fixed positions with respect to each other because there is not enough thermal energy to overcome the intermolecular interactions between the particles. As a result, solids have a definite shape and volume.

6 0
3 years ago
If the salt created from the reaction of a strong acid and a weak base is added to a solution, what will happen to the solution
hoa [83]

Answer:

See Explanation

Explanation:

When a salt is dissolved in water, the solution could be acidic, basic or neutral depending on the nature of acid and base from which the salt was formed.

When a salt is formed from a strong acid and a weak base, the salt solution is acidic.

For instance, NH4Cl is a salt formed from NH3 which is a weak base and HCl which is a strong acid. The salt hydrolyses as follows;

NH4^+(aq) + H2O(l)  ------> H3O^+(aq) + NH3(aq)

Hence an acidic solution is formed.

4 0
3 years ago
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