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3 years ago

What is the only part of an atom that cannot change (either protons, neutrons, or electrons)?

1 answer:

3 0

The number of protons never changes in an atom. More electrons means a negative charge and fewer means a positive charge. Once an atom has an electrical charge it is called an ion. In an ion the atomic number and atomic mass do not change from the original.

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Why does chocolate melt faster when crushed?

solong [7]

Less compassionate around the chocolate

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3 years ago

Read 2 more answers

ANYONE HELP ME IN CHEMISTRY:(<br>JUST THE NAME AND SYMBOL <br>ANYONE WHO CAN HELP ME:(

lana [24]

Answer:

Hydrogen: H, Helium: He, Carbon: C

Nitrogen: N, Oxygen: O, Fluorine: F

Neon: Ne, Sodium: Na, Magnesium: Mg

Aluminum: Al, Silicon: Si, Phosphorus: P

Chlorine: Cl, Selenium: Se, Silver: Ag

Titanium: Ti, Beryllium: Be, Lithium: Li

Uranium: U, Nickel: Ni , Copper: Cu

Bromine: Br, Cadmium: Cd, Zinc: Zn

Cobalt: Co, Gallium: Ga, Germanium: Ge

Iron: Fe, Krypton: Kr, Potassium: K

Calcium: Ca, Chromium: Cr, Manganese: Mn

Scandium: Sc, Tin: Sn, Vanadium: V

Platinum: Pt, Boron: B, Au: Gold

7 0

3 years ago

Calculate the mass percent of ba(no3)2 in this solution, assuming the density of the solution is 1.000 kg/l.

viktelen [127]

You forgot to include the known characteristics of the solution.

I searched them and copy here:

volume: 1.000 liter

M = 0.0190 M

Now, you can start with the definition of mass percent.

mass percent = (grams of solute / grams of solution) * 100

grams of solute are obtained from the molar concentration:

M = (number of moles of solute) / (volume of solution in liters)

where number of moles = (grams) / (molar mass)

=> M = (grams of solute / molar mass of solute) / (volume of solution in liters)

=> grams of solute = M * (volume of solution in liters) * (molar mass of solute)

And density = (kg of solution / volume of solution in liters) =>

kg of solution = density * volume of solution in liters

grams of solution = density * (volume of solution in liters) * 1000 g/kg

=> mass percent = M * (volume of solution in liters) * (molar mass) / (density * volume of solution in liters * 1000 g/ kg) * 100

=> mass percent = M * molar mass * 10 / density

now replace the values known:

M = 0.0190 mol / liter
density = 1,000 kg / liter

molar mass of Ba(NO3)2 = 137.327 g/mol + 2*14.007 g/mol + 2*3*15.999 g/mol = 256.335 g/mol

=> mass percent = 0.0190 mol/liter * 256.335 g/mol * 10 kg/ g / (1.000 kg/liter)

=> mass percent = 48.7%

6 0

4 years ago

unknown element x has a mass number of 88 and contains 50 neutrons in the atom. element x is strontium

AnnyKZ [126]

Strontium element has a mass number of 88 and contains 50 neutrons in the atom.

Given that;

Mass number of element X = 88

Number of Neutrons in element X = 50

we know the concept that Mass number is represent as total number of Neutrons and proton present in Nucleus

So, Mass number of element X = Number of Neutrons in element X + Number of Protons in element X

Thus, 88 = 50 + Number of Protons in element X

Number of Protons in element X = 38

As, Number of proton = Atomic number

So, Atomic number of element X = 38

Hence Unknown Element X is Strontium

To know more about Strontium element visit here ; brainly.com/question/19298437?referrer=searchResults

#SPJ4

5 0

1 year ago

The gravitational pull of the Sun affects which of the following properties of the planets in our solar system?

ki77a [65]

Speed and shape of orbit

5 0

3 years ago