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oksano4ka [1.4K]
3 years ago
14

I need help pleaseee

Chemistry
1 answer:
Likurg_2 [28]3 years ago
3 0
The answer is d!!!!!!!
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In general, the energy needed to remove an electron (the ionization energy) increases as the atomic number increases across a period.

Explanation:

Each additional proton increases the attraction between the nucleus and the electron.

Thus, it takes more energy to remove an electron as you add extra protons.

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How many particles are in 0.55 mil NaCl?
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100 points please help me will also mark brainliest!
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Read 2 more answers
You have a cup of tea (250 ml) that is 375 K which is too hot to drink. It needs to be cooled to 350 K before you can drink it.
S_A_V [24]

Answer:

The hot tea should transfer <em>25.63 kJ</em> the surroundings to cool the tea.

Explanation:

  • To solve this problem, we can use the relation:

<em>Q = m.c.ΔT,</em>

where, Q is the amount of heat has to be transferred from the tea to the surroundings to cool the tea (Q = ??? J).

m is the mass of the hot tea (m = dV = (1.0 g/mL)(250 mL) = 250 g), suppose the density of water is the density of tea.

c is the specific heat of the hot tea (c = 4.10 J/°C.g).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 350 K - 375 K = -25°C).

<em>∴ Q = m.c.ΔT</em> = (250 g)(4.10 J/°C.g)(-25°C)) = <em>- 25630 J = - 25.63 kJ.</em>

<em>So, the hot tea should transfer 25.63 kJ the surroundings to cool the tea.</em>

4 0
3 years ago
3. At 35 C, a sample of gas has a volume of 256 ml and a pressure of 720.torr. What would the volume
STatiana [176]

Answer:

The volume will be 185.83 mL.

Explanation:

Gay-Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. Gay-Lussac's law can be expressed mathematically as follows:

\frac{P}{T} =k

Where P = pressure, T = temperature, k = Constant

Boyle's law says that 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

Where P = pressure, V = volume, k = Constant

Finally, Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is kept at a constant pressure. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .

In summary, Charles's law is a law that 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

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

Studying two different states, an initial state 1 and a final state 2, it is satisfied:

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

In this case:

  • P1= 720 torr
  • V1= 256 mL
  • T1= 35 C= 308 K (being 0 C= 273 K)
  • P2= 1.25 atm= 950 torr (being 1 atm= 760 torr)
  • V2= ?
  • T2= 22 C= 295 K

Replacing:

\frac{720 torr*256 mL}{308 K} =\frac{950 torr*V2}{295 K}

Solving:

V2= \frac{295K}{950 torr} *\frac{720 torr*256 mL}{308 K}

V2= 185.83 mL

<u><em>The volume will be 185.83 mL.</em></u>

6 0
3 years ago
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