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3 years ago

How do scientists determine the number of neutrons in an isotope of an atom?

1 answer:

4 0

D. The atomic mass in amu is basically the number or nuclei since the mass of the electrons is negligible. For a given atom (element) the number of protons is fixed. Say the element has 10 protons. If the atomic weight is 14 atomic mass units (amu), you know that there are 4 neutrons, since both neutrons and protons are 1 amu each and there are 10 protons

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What the density of an object that has a volume of 20ml and mass of 3g.

Oxana [17]

Answer:

The equation of D = m/V

Where D = density

m = mass

and V = volume

We are solving for V, so with the manipulation of variables we multiply V on both sides giving us

V(D) = m

now we divide D on both sides giving us

V = m/D

We know our mass which is 600g and our density is 3.00 g/cm^3

V = 600g/3.00g/cm^3 = 200cm^3 or 200mL

a cubic centimeter (cm^3) is one of the units for volume. It's exactly like mL. 1 cm^3 = 1 mL

If you wish to change it to L, you'd have to convert

Explanation:

8 0

3 years ago

A baby elephant trots in a straight line along a river. The horizontal position of the elephant in meters over

mote1985 [20]

Answer:

Displacement -6

Distance 24

Explanation:

5 0

3 years ago

Positively-charged particles consisting of two protons and two neutrons emitted by radioactive materials are

BARSIC [14]

Answer:

The answer to your question is Alpha particles.

Explanation: An electron released by a radioactive nucleus that causes a neutron to change into a proton is called a beta particle.

6 0

3 years ago

Fill in the blank

nignag [31]

Answer:

temperature

Explanation:

when you put a water on the stove the water will start to boil there for temperature

5 0

3 years ago

A rectangular metal tank with an open top is to hold 171.5 cubic feet of liquid. what are the dimensions of the tank that requir

Semmy [17]

To minimize the material usage we have to have the volume requested with the minimum surface area.
The volume is:
$171.5 =xyz$
And the surface is:
$S=xy+2xz+2yz$
From the first equation we get:
$z=\frac{171.5}{xy} ; k=171.5\\ z=\frac{k}{xy}\\$
I will use k instead of a number just for the conveince.
We plug this into the second equation and we get:
$S=xy+2k\frac{1}{x}+2k\frac{1}{y}$
To find the minimum of this function we have to find the zeros of its first derivative.
Sx will denote the first derivative with respect to x and Sy will denote the first derivative with respect to Sy.
$S_x=y-2k\frac{1}{x^2}\\ S_y=x-2k\frac{1}{y^2}$
Now let both derivatives go to zero and solve the system (this will give us the so-called critical points).
$0=y-2k\frac{1}{x^2}\\
0=x-2k\frac{1}{y^2}\\
y=2k\frac{1}{x^2}\\
x=2k\frac{1}{y^2}\\$
Now we plug in the first equation into the other and we get:
$x=\frac{\frac{2k}{1}}{\frac{4k^2}{x^4}}\\
x^3=2k\\
x=(2\cdot171.5)^{1/3}\\
x=7
$
Now we can calculate y:
$y=2k\frac{1}{x^2}\\
y=2\cdot 171.5\frac{1}{7^2}=7$
And finaly we calculate z:
$z=\frac{171.5}{xy}\\
z=\frac{171.5}{7\cdot7}=3.5$
And finaly let's check our result:
$V=xyz=7\cdot7\cdot3.5=171.5$

4 0

3 years ago