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3 years ago

What subatomic particles are found in the nucleus and in the electron cloud

Chemistry

2 answers:

Dafna1 [17]3 years ago

6 0

Answer:

Electrons

Explanation:

alex41 [277]3 years ago

6 0

Someone already answered the question but I need those 10 points so hello (:

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A sample of radioactive waste has a half-live of 40 years and an activity level of 4 curies. After how many years will the activ

Westkost [7]

After 160 years, the activity level of the sample will be 0.5 curies.

Half life of any radioactive waste is the half decay of that product.

The formula is $\dfrac{\lambda }{\lambda_1} = 2^\dfrac{a}{b}$

Where, λ is 4 cruies

λ1 is 0.5 cruies

b = 40 years

Putting the values in the equation

$\dfrac{4}{0.5} = 2^\dfrac{a}{40}\\\\\\\dfrac{a}{40} = 4\\ = 160 years$

Thus, the correct option is 160 years.

Learn more about half-life

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8 0

1 year ago

All forms of crystalline carbon have the same structure. True or False

zysi [14]

False, carbon is an allotrope that can be in the forms of graphite, diamond etc

3 0

3 years ago

Limiting Reactant

liraira [26]

Answer:

(1) Cl₂ is the limiting reactant.

(2) 8.18 g

Explanation:

2Na(s) + Cl₂(g) → 2NaCl(s)

First we convert the given masses of reactants into moles, using their respective molar masses:

Na ⇒ 12.0 g ÷ 23 g/mol = 0.522 mol Na

Cl₂ ⇒ 5.00 g ÷ 70.9 g/mol = 0.070 mol Cl₂

0.070 moles of Cl₂ would react completely with (2 * 0.070) 0.14 moles of Na. There are more Na moles than that, so Na is the reactant in excess while Cl₂ is the limiting reactant.

Then we calculate how many moles of NaCl are formed, using the limiting reactant:

0.070 mol Cl₂ * $\frac{2molNaCl}{1molCl_2}$ = 0.14 mol NaCl

Finally we convert NaCl moles into grams:

0.14 mol NaCl * 58.44 g/mol = 8.18 g

3 0

3 years ago

calculate the mols of alt gas if the volume is 0.97 liters at a temperature of 12 C and the pressure is 152 Kpa’s

katrin2010 [14]

Answer:

0.062mol

Explanation:

Using ideal gas law as follows;

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821Latm/molK)

T = temperature (K)

Based on the information provided;

P = 152 Kpa = 152/101 = 1.50atm

V = 0.97L

n = ?

T = 12°C = 12 + 273 = 285K

Using PV = nRT

n = PV/RT

n = (1.5 × 0.97) ÷ (0.0821 × 285)

n = 1.455 ÷ 23.39

n = 0.062mol

4 0

3 years ago

What is this equation balanced?

Brums [2.3K]

This equation is impossible. NaSO4 is non-existent. Did you mean Na2SO4?

4 0

2 years ago