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kvv77 [185]
2 years ago
12

How do you figure out the # of neutrons?

Chemistry
2 answers:
Colt1911 [192]2 years ago
5 0

Answer:

Subtracting the number of protons from the atomic mass.

viktelen [127]2 years ago
3 0

Answer:

Subtract Protons

Explanation:

Since the vast majority of atom's mass is found it's protons and neutrons, Subtracting the Number of Protons ( i.e. the atomic number ) from the atomic mass will give you the calculated number of neutrons in a atom,

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Which phase lasts longer, a full moon or a new moon?
Natasha_Volkova [10]

Answer: Definitely the answer is C. They both last for the same number of days.

Explanation: This requires the moon to complete a bit more than one orbit to be between the earth and the sun again. The period from new moon to full moon is one half a synodic month of 29.530/2 which is 14.765 days.

3 0
3 years ago
Read 2 more answers
The decomposition of H2O2 is first order in H2O2 and the rate constant for this reaction is 1.63 x 10-4 s-1. How long will it ta
Mamont248 [21]

Answer:

It will take 6486.92 minutes  for [H2O2] to fall from 0.95 M to 0.33 M

Explanation:

The order of reaction is defined as the sum of the powers of the concentration terms in the equation. Order of a reaction is given by the number of atoms or molecule whose concentration change during the reaction and determine the rate of reaction.

In first order reaction;

In \dfrac{a}{a_o-x}= k_1 t

where;

a = concentration at time t

a_o = initial concentration

and k = constant.

In (\dfrac{0.33}{0.95})= -1.63 \times 10^{-4} \times t

-1.05736933 = -1.63 \times 10^{-4} \times t

t = \dfrac{-1.05736933}{  -1.63 \times 10^{-4} }

t = 6486.92 minutes

3 0
3 years ago
Rank the following in order from most acidic to least acidic. sample pH bleach 12.5 coffee 4.2 rainwater 5.4 soap 10.1 (1 point)
Ainat [17]
Hope this helps you.

6 0
3 years ago
At 1 atm, how much energy is required to heat 39.0 g of h2o(s at –24.0 °c to h2o(g at 121.0 °c?
earnstyle [38]
Q = mcΔt, q = energy [J] m = mass (of water) [g]; c = specific heat capacity of water [J g⁻¹ K⁻¹/°C⁻¹]; Δt = change in temperature [K/°C]
Δt = 121 - -24 = 145
q = 39 × 4.18 × 145
q = 23637.9 J
4 0
3 years ago
What are the three main particles in the modern model of an atom
EastWind [94]
Protons and neutrons in the nucleus (the bit in the middle) and small tiny electrons that orbit the nucleus
7 0
3 years ago
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