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Alexeev081 [22]
3 years ago
14

Helium decays to form lithium. Which equation correctly describes this decay?

Chemistry
2 answers:
GrogVix [38]3 years ago
8 0

Answer:

⁴He₂ → ⁴Li₃ + ⁰e₋₁.

Explanation:

  • Helium decays with the release of an electron to form a lithium nucleus.
  • The number of nucleons is the same on both sides of the equation.
  • A neutron decays to form a proton with the release of an electron.
  • The atomic number increases from 2 to 3 while the atomic mass number stays the same at 4 nucleons.
marusya05 [52]3 years ago
7 0

Answer:

C

Explanation:

edg

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A bowling ball (mass = 7.2 kg, radius = 0.10 m) and a billiard
evablogger [386]

Answer:

Maximum gravitational Force: F_{gmax} = 1,026*10^{-08} N

Explanation:

The maximum gravitational force is achieved when the center of gravity are the closer they can be. For the spheres the center of gravity is at the center of it, so the closer this two centers of gravity can be is:

bowling ball radius + billiard ball radius = 0,128 m

The general equation for the magnitude of gravitational force is:

F_{gmax}  = G \frac{M*m}{r_{min}^{2} }

Solving for:

G = 6,67*10^{-11}  \frac{Nm^{2}}{kg^{2}}

M = 7,2 kg

m = 0,35 kg

r_{min} = 0,128 m

The result is:

F_{gmax} = 1,026*10^{-08} N

3 0
3 years ago
What is the total number of moles of solute in 0.7 liters of a 4.4 M solution of NaCl
Leokris [45]

Answer:

answer will be 3.08 mol ig.....

3 0
2 years ago
Derek needs a tool that delivers 25.00 mL of a sodium hydroxide solution. What tool would be best for him to use?
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He may use a pipette with a volume greater than 25 ml to transfer the solution.
4 0
3 years ago
How many grams are in 11.9 moles of chromirum
faust18 [17]

Answer:

Explanation:

Method 1 proportion

1 mole of chromium is 52 grams

11.9 moles = x grams

1/11.9 = 52/x                    Cross multiply

x = 11.9 * 52

x = 618.8                         grams

Now I have used an approximate mass for Chromium. The answer you get here is expected to reflect the weigth given on your periodic table Use that to get your answer. You should give a number very close to mine. Round to 3 places as in 619.

Method Two  Formula

mols = given mass / molecular mass

11.9 = given mass /  51.9961          Multiply both sides by  51.9961

11.9 *51.9961  = given mass            

given mass = 618.75

given mass = 619

3 0
3 years ago
According to the VSEPR theory, which of the following factors determines the shape of a
Gala2k [10]

Answer:

B only

Explanation:

Using the VSEPR principle, the electron bond pairs and the lone pairs on the middle atom help us predict the structure of the molecule. The shape of a molecule is determined by the position of the nucleus and its electrons. The electrons and the nucleus settle in positions that minimize repulsion and maximize attraction.

4 0
3 years ago
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