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notka56 [123]
3 years ago
15

How could Mendeleev predict the properties of elements that had not yet been discovered?

Chemistry
1 answer:
icang [17]3 years ago
3 0
It was the element of aluminium where they predict their properties <span />
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How many moles of oxygen are needed for the complete combustion of 29.2 grams of acetylene?
podryga [215]

Moles of Oxygen= 2.8075 moles

<h3>Further explanation</h3>

Given

29.2 grams of acetylene

Required

moles of Oxygen

Solution

Reaction(Combustion of Acetylene) :

2 C₂H₂ (g) + 5 O₂ (g) ⇒ 4CO₂ (g) + 2H₂O (g)

Mol of Acetylene :

= mass : MW Acetylene

= 29.2 g : 26 g/mol

= 1.123

From equation, mol ratio of Acetylene(C₂H₂) : O₂ = 2 : 5, so mol O₂ :

= 5/2 x mol C₂H₂

= 5/2 x 1.123

= 2.8075 moles

7 0
2 years ago
2CO + O2  2CO2
murzikaleks [220]

Answer:

75 L Co2

37.5 L o2

Explanation:

welcome.

3 0
3 years ago
Which of the following statements is true for radioactive reactions:
sasho [114]

Answer:

d) Nucleus of the element does not change during the react

hope it helps (^^)

# Cary on learning

8 0
2 years ago
Read 2 more answers
Who was the first person to go to the moon​
mestny [16]

Answer:

The first person to go to the moon

Explanation:

Neil Armstrong was the first person !

heres more info on NASAs page!

https://www.nasa.gov/audience/forstudents/k-4/stories/first-person-on-moon.html

8 0
3 years ago
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Why is the organization of the periodic table by physical properties not very useful?
OverLord2011 [107]

Answer:

It shows no regular pattern

Explanation:

Physical properties of an element are those we can observe and feel with our senses. Also, the use special equipment can enhance our perception of these properties.

  • The same physical property can be shared different number elements.
  • On the periodic table, all the elements in group 1 and 2 are metals.
  • This is not very useful for scientists whose emphasis is to distinguish one atom from the other.
  • Therefore, physical properties are highly limited in the organization of the periodic table.
7 0
3 years ago
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