3 years ago

How many valence electrons does hydrogen need to have a full first shell?

1 answer:

5 0

Well, the element of hydrogen only has 1 electron in its s sub shell, if it's s sub shell for the energy level of 1 were to be filled, there would need to be 2 electrons present in its shell to have a full first shell, as the s sub shell can only hold 2 electrons within it.

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Which amount of a compound dissolved in 100g of water at the stated temperature represents a solution that is saturated

Assoli18 [71]

40 g KNO, at 25°C

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3 years ago

If a substance has a half life of 58 years and starts with 500 g radioactive, how much remains radioactive after 30 years?

Vilka [71]

Answer:

A = 349 g.

Explanation:

Hello there!

In this case, since the radioactive decay kinetic model is based on the first-order kinetics whose integrated rate law is:

$A=Ao*exp(-kt)$

We can firstly calculate the rate constant given the half-life as shown below:

$k=\frac{ln(2)}{t_{1/2}} =\frac{ln(2)}{58year}=0.012year^{-1}$

Therefore, we can next plug in the rate constant, elapsed time and initial mass of the radioactive to obtain:

$A=500g*exp(-0.012year^{-1} *30year)\\\\A=349g$

Regards!

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3 years ago

The chemical reaction between the reagents luminol and bleach produces a brief flash of light. Which change would most likely ma

Shalnov [3]

Decrease the temperature

8 0

2 years ago

What mass of solute is contained in 25.4 ml of a 1.56 m potassium bromide solution?

mash [69]

Answer is: mass of <span>potassium bromide is 4.71 grams.
V(KBr) = 25.4 mL </span>÷ 1000 mL/L = 0.0254 L, volume of solution.
c(KBr) = 1.56 mol/L.
n(KBr) = c(KBr) · V(KBr).
n(KBr) = 1.56 mol/L 0.054 L.
n(KBr) = 0.0396 mol, amount of substance.
m(KBr) = n(KBr) · M(KBr).
m(KBr) = 0.0396 mol · 119 g/mol.
m(KBr) = 4.71 g.
M - molar mass.

3 0

2 years ago

Read 2 more answers

How is 0.246¯¯¯¯ written as a fraction in simplest form?

KiRa [710]

$0.246 = \dfrac{246}{1000} = \dfrac{246 \div 2}{1000 \div 2} = \dfrac{123}{500}$

4 0

2 years ago