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BabaBlast [244]
3 years ago
13

Semimetals is a term which refers to what

Chemistry
2 answers:
Setler [38]3 years ago
5 0
Metalloids, i’m pretty sure
zvonat [6]3 years ago
3 0

Answer:

Metalloids, also known as semimetals are elements containing properties similar and midway between metals and nonmetals. They are found to divide the periodic table between the metals on the left and the nonmetals on the right. Metalloids often have the following properties: could be dull or shiny.

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A Sample Of Oxygen Gas Is Collected Over Water At 22°C And 98.67 KPa Pressure. If The Partial Pressure Of The Water Is 2.67 KPa,
Gwar [14]

Answer:

  • <em>The partial pressure of the oxygen gas is </em><u>96.00 KPa</u>

Explanation:

The law of partial pressures states that, in a mixture of gases, the total pressure of the mixture is equal to the sum of the individual pressures of each gas, as if each gas were alone in the mixture.

So:

  • Total pressure = ∑ individual pressures

  • Total pressure = Partial pressure of the water + Partial pressure of oxygen

  • 98.67 KPa = 2.67 KPa + Partial pressure of oxygen

  • Partial pressure of oxygen = 98.67 KPa - 2.67 KPa

  • Partial pressure of oxygen = 96.00 KPa ← answer
4 0
4 years ago
____ 26. what is the weight percentage of nitrogen in urea, cn2h4o
Paraphin [41]
Weight percentage of nitrogen can be calculated using the following rule:
weight percentage of nitrogen = (weight of nitrogen / weight of urea) x 100

From the periodic table:
molecular mass of carbon = 12 grams
molecular mass of nitrogen = 14 grams
molecular mass of hydrogen = 1 grams
molecular mass of oxygen = 16 grams

therefore:
mass of nitrogen in urea = 2(14) = 28 grams
mass of urea = 12 + 2(14) + 4(1) + 16 = 60 grams

Substitute with the masses in the equation to get the percentage:
weight percentage of nitrogen = (28/60) x 100 = 46.667%
7 0
4 years ago
WILL MARK BRAINLIEST WORTH 20 POINTS PLEASE HELP ASAP
s2008m [1.1K]

Answer:

A

Explanation:

Hydrogen and chlorine need to be balanced. There is an equal amount of magnesium on each side

3 0
3 years ago
You want to know the concentration of 50.0 ml of a solution of H2SO4. The endpoint was reached when 40.0 ml of 0.20M Ba(OH)2 tit
Kryger [21]
Can you explain it a little better ?
8 0
3 years ago
1 If 5.80 L of gas is collected at a pressure of 92.0 kPa, what volume will the same gas occupy at 101.3 kPa if the temperature
Anni [7]

Answer:

The volume that the same gas will occupy at 101.3 kPa if the temperature is kept constant is 5.27 L.

Explanation:

As the volume increases, the particles (atoms or molecules) of the gas take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law that says:

"The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

P * V = k

Now it is possible to assume that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1 * V1 = P2 * V2

In this case, you have:

  • P1= 92 kPa
  • V1= 5.80 L
  • P2= 101.3 kPa
  • V2= ?

Replacing:

92 kPa* 5.80 L= 101.3 kPa* V2

and solving, you get:

V2=\frac{92 kPa* 5.80 L}{101.3 kPa}

V2= 5.27 L

<u><em>The volume that the same gas will occupy at 101.3 kPa if the temperature is kept constant is 5.27 L.</em></u>

4 0
3 years ago
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