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Marrrta [24]
4 years ago
5

When placed in a 100-ml cube-shaped box, a substance filled the cube and has a volume of 100ml. when placed in a 50-ml tube, tha

t same amount of substance filled the tube and thus has a 20-ml volume. what is the state of the substance?
Chemistry
1 answer:
finlep [7]4 years ago
5 0
The state of the substance, most likely, would be a gas. Given the same amount of the substance being able to fill different volumes of containers, means that the substance is compressible. From the three phases of matter, gas is surely the compressible one while liquids are sometimes compressible but only up to certain extent. Also, the substance cannot be a a solid since a solid would have a definite shape and volume. Nor it cannot be a liquid since a liquid cannot fill the whole container and it does not change its volume no matter what is the container. 
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in a sample of silcon 92.21% of the atoms have a mass of 27.98 amu, 4.70% have a mass of 28.98 amu and 3.09% have a mass of 29.9
oksano4ka [1.4K]

Answer: 28.1 amu

Explanation:

Mass of isotope 1 = 27.98 amu

% abundance of isotope 1 = 92.21% = \frac{92.21}{100}=0.9221

Mass of isotope 2 = 28.98 amu

% abundance of isotope 2 = 4.70% = \frac{4.70}{100}=0.047

Mass of isotope 3 = 29.97 amu

% abundance of isotope 2 = 3.09% = \frac{3.09}{100}=0.0309

Formula used for average atomic mass of an element :

\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})

A=\sum[(27.98 )\times 0.922+(28.98)\times 0.047+(29.97)\times 0.0309]

A=28.1amu

Therefore, the average atomic mass of silicon is 28.1 amu

5 0
3 years ago
What are some chemical and physical properties of soap (saponification) please help it’s very urgent!
xxTIMURxx [149]

Answer: Soaps are sodium or potassium fatty acids salts, produced from the hydrolysis of fats in a chemical reaction called saponification. Each soap molecule has a long hydrocarbon chain, sometimes called its 'tail', with a carboxylate 'head'.

Explanation: Saponification is an exothermic chemical reaction—which means that it gives off heat—that occurs when fats or oils (fatty acids) come into contact with lye, a base. In this reaction, the triglyceride units of fats react with sodium hydroxide or potassium hydroxide and are converted to soap and glycerol.

5 0
3 years ago
Fungi are both _____________ (ex. yeast) and _____________ (ex. mushrooms & mold) living organisms.
Tatiana [17]

Answer:

Yeast and mushroom

Explanation:

Yeast and mushroom appears in decaying substances.

4 0
4 years ago
1. Convert the following:<br> 5 meters =<br> kilometers
a_sh-v [17]
It equals 0.005 but plz mark this as the brainliest question plz

5 0
4 years ago
Read 2 more answers
Hydrogen gas is produced when zinc reacts with hydrochloric acid. If the actual yield of this reaction is 85%?
Leokris [45]
Reaction equation:
Zn + 2HCl → ZnCl₂ + H₂

One mole of gas occupies 22.4 L at STP
Moles of H₂ = 112/22.4
= 5 moles

The theoretical amount of Zn needed is 5 mol
The actual amount = 5/0.85
= 5.88 moles

mass = moles x Mr
mass = 5.88 x 65
mass = 382.2 g

The answer is D.
7 0
3 years ago
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