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Mars2501 [29]
3 years ago
7

In the cathode ray experiment, the cathode ray is seen to move from the negative disk to the positive disk. What kind of subatom

ic particle will move in. the opposite direction of the cathode ray?
Chemistry
1 answer:
Tomtit [17]3 years ago
8 0

Answer:

Gixt8x75zurx7txr7x7tzzr7zr7z64zz7z84

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When 12.71 g of copper react with 8.000 g of sulfur, 14.72 g of copper(I) sulphide is produced. What is the percentage yield in
Citrus2011 [14]
2Cu + S = Cu₂S

n(Cu)=m(Cu)/M(Cu)
n(Cu)=12.71/63.55=0.2 mol

n(S)=m(s)/M(S)
n(S)=8.000/32.01=0.25 mol

Cu:S  2:1  
0.2 mol : 0.25 mol copper deficiency, sulphur in excess

theoretical mass of copper (I) sulfide 
m(Cu₂S)=M(Cu₂S)n(Cu)/2

the percentage yield in the reaction is
w=m'(Cu₂S)/m(Cu₂S)=2m'(Cu₂S)/M(Cu₂S)n(Cu)
w=2*14.72/(159.16*0.2)=0.925 (92.5%)

5 0
3 years ago
The weights of all elements are always compared to oxygen.<br> True <br> False
kozerog [31]

Answer:

false

Explanation:

I'm pretty sure it's compared to carbon

8 0
3 years ago
Read 2 more answers
How many hydrogen bonds can CH3NH2 make to water?
ikadub [295]

CH3NH2 can only have as many hydrogen bonds as hydrogen bonding sites in the molecule. CH3NH2 has two N−H bonds and a lone pair of electrons on the nitrogen atom. Therefore, CH3NH2 can form three hydrogen bonds with water.

4 0
3 years ago
A rigid cylinder with a movable piston contains a sample of gas. At 300. K, this sample has a pressure of 240. Kilopascals and a
iren [92.7K]

Answer:

The volume of this sample when the temperature is changed to 150 K and the pressure is changed to 160 kPa is 52.5 mL.

Explanation:

Boyle's law says that: "The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure" and is expressed mathematically as:

P * V = k

where k is a constant.

Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is maintained at a constant pressure, by means of a constant of proportionality that is applied directly. So Charles's law is a law that mathematically says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

\frac{V}{T}=k

Gay-Lussac's law states that the pressure of a fixed volume of a gas is directly proportional to its temperature. In other words, if the volume of a certain quantity of ideal gas remains constant, the quotient between pressure and temperature remains constant:

\frac{P}{T}=k

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

\frac{P*V}{T}=k

Considering an initial state 1 and a final state 2, it is satisfied:

\frac{P1*V1}{T1}=\frac{P2*V2}{T2}

In this case:

  • P1: 240 kPa
  • V1: 70 mL
  • T1: 300 K
  • P2: 160 kPa
  • V2: ?
  • T2: 150 K

Replacing:

\frac{240 kPa*70 mL}{300 K}=\frac{160 kPa*V2}{150 K}

Solving:

V2=\frac{150 K}{160 kPa} *\frac{240 kPa*70 mL}{300 K}

V2= 52.5 mL

<u><em>The volume of this sample when the temperature is changed to 150 K and the pressure is changed to 160 kPa is 52.5 mL.</em></u>

6 0
3 years ago
Read 2 more answers
Which of the following coefficients will correctly
valentina_108 [34]

Answer:

#2 is the answer

Bcuz 2 times 2 = 4

8 0
3 years ago
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