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yanalaym [24]
2 years ago
5

What chemical is discovered to react to light in the 1700s?

Chemistry
2 answers:
WARRIOR [948]2 years ago
5 0
When Scheele discovered oxygen he called it "fire air" as it supported combustion. The answer is oxygen.
leonid [27]2 years ago
4 0
Oxygen or maybe hydrogen
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allochka39001 [22]
<span>Ionic compounds are chemical compounds in which ions are held together in a lattice structure by ionic bonds. They have a high melting and boiling point, and they have a high hardness and are very brittle. The cations and anions are stuck together in a sense. So in this case, sodium (Na) is attracted to Chlorine (Cl).</span>
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3 years ago
What happens when ethane gas is passed though alkaline KMnO4 solution​
BigorU [14]

Answer : When ethylene is passed through alkaline KMnO4 solution 1, 2-Ethanediol is formed. The Purple color of KMnO4 decolorizes.

8 0
2 years ago
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Science pls helppp?!
hichkok12 [17]

Answer:

2nd one down

Explanation: distance divided by time interval

6 0
2 years ago
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A is scientific knowledge established through direct observation and remains constant. Scientific knowledge can change when scie
tatyana61 [14]

This is a fill in the blanks question.


This is where the blanks are: A __________ is scientific knowledge established through direct observation and remains constant. Scientific knowledge can change when scientists _____________


The answer is followiing.


Answer: A <em>law</em> is scientific knowledge established through direct observation and remains constant. Scientific knowledge can change when scientists <em>find new evidence</em>.


Explanation:


A scientific law describes the relation (usually in mathematical terms) of natural phenomena and is supported by numerous observations and experiments. The laws are established when all the observations and result show that all the facts obey the same relation. For instance, the Universal law of gravitation: all the objects are attracted with a force that is directly proportional to the product of their masses and inversely related to the square of the distance that separates them: in lay terms, everything that goes up has to go down, and you do not expect that when a parachutist jumps out of an airplane he or she does not fall on the ground.


On the other hand, a scientific theory, although is an explanation that has been repeatedly tested and verified, is always under scientific scrtutiny and, as additional evidence is gathered it can be modified or replaced by a new theory. That is why it is said that scientific theories have to be testable and falsiable: if it is not testable and falsiable then it  is not a scientific theory.


Scientific theories are aimed to describe, explain and make predictions about the objectivable world.

6 0
2 years ago
How many grams of C2H6 are needed to react with 54 grams of O2?
Dmitrij [34]

Answer:

Explanation:

in a combustion of ethane 2 moles of ethane react with 7 moles of O2

now no of moles in 54 gram of O2=mass/ molar mass

moles =54/32=1.7 moles

if 7 moles of O2 required 2 moles of ethane then 1.7 mole required=?

7 moles of O2=2 moles of C2H6

1.7 moles of O2=1.7*2/7=0.5 moles of C2H6

0.5 moles of C2H6 contain how much grams=?

mass= moles*molar mass=0.5*30=15

4 0
3 years ago
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