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3 years ago

15

Help me please :3 :3 :3 ;3

2 answers:

tester [92]3 years ago

7 0

I think the correct answer is b

bekas [8.4K]3 years ago

6 0

I think the correct answer would be B) Suggestion 1

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_____ are isotopes that emit radiation because they have unstable nuclei.

alexandr1967 [171]

The correct answer among the choices given is option B. Radioisotopes are isotopes that emit radiation because they have unstable nuclei. These are radioactive isotopes of an element. They are defined as atoms that contain an unstable combination of neutrons and protons.

7 0

4 years ago

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The following reaction was performed in a sealed vessel at 791 ∘C : H2(g)+I2(g)⇌2HI(g) Initially, only H2 and I2 were present at

OlgaM077 [116]

Answer:

4.31 × 10²

Explanation:

Equation of the reaction;

$H_{2(g)} + I_{2(g)}$ ⇌ $2HI_{(g)$

The ICE Table is shown as follows:

$H_{2(g)}$ $+$ $I_{2(g)}$ ⇌ $2HI_{(g)$

Initial 3.10 2.50 0

Change - x -x + 2x

Equilibrium (3.10 - x) 0.0800 2x

From $I_{2(g)}$ ;

We can see that 2.50 - x = 0.0800

So; we can solve for x;

x = 2.50 - 0.0800

x = 2.42

$H_{2(g)}$ which = (3.10 -x) will be :

= 3.10 - 2.42

= 0.68

$2HI_{(g)$ = 2x

= 2 (2.42)

= 4.84

$K_c = \frac{[HI]^2}{[H_2][I_2]}$

$K_c = \frac{(4.84)^2}{(0.68)(0.0800)}$

$K_c =\frac{23.4256}{0.0544}$

$K_c =$ 430.62

$K_c$ ≅ 431

$K_c$ = 4.31 × 10²

6 0

3 years ago

What happens to the particles as you increase the oven’s temperature

vekshin1

The particles move faster because heat causes the atoms to speed up and move farther from each other.

3 0

4 years ago

A 1.25g sample of dry ice is added to a 765mL flask containing nitrogen gas at a temperature of 25.0°C and a pressure of 725 mmH

erica [24]

Answer : The total pressure in the flask is 1.86 atm.

Explanation :

First we have to calculate the pressure of $CO_2$ gas.

Using ideal gas equation :

$PV=nRT\\\\P_{CO_2}=\frac{w}{M}\frac{RT}{V}$

where,

P = Pressure of $CO_2$ gas = ?

V = Volume of $CO_2$ gas = 765 mL = 0.765 L (1 L = 1000 mL)

n = number of moles

w = mass of $CO_2$ gas = 1.25 g

M = molar mass of $CO_2$ gas = 44 g/mol

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $CO_2$ gas = $25.0^oC=273+25.0=298K$

Putting values in above equation, we get:

$P_{CO_2}=\frac{w}{M}\frac{RT}{V}$

$P_{CO_2}=\frac{1.25g}{44g/mol}\frac{(0.0821L.atm/mol.K)\times 298K}{0.765L}=0.909atm$

Now we have to calculate the total pressure in the flask.

$P_T=P_{N_2}+P_{CO_2}$

Given :

$P_{CO_2}=0.909atm$

$P_{N_2}=725mmHg=\frac{725}{760}=0.954atm$

conversion used : (1 atm = 760 mmHg)

Now put all the given values in the above expression, we get:

$P_T=0.954atm+0.909atm=1.86atm$

Therefore, the total pressure in the flask is 1.86 atm.

5 0

3 years ago

All of the following are true regarding alcoholic fermentation, except that alcoholic fermentation A. does not require

pashok25 [27]

<span> B. produces as much energy as cell respiration. i am pretty sure that is the answer</span>

6 0

3 years ago

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