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Vikentia [17]
2 years ago
11

The atomic number and mass number for calcium 39 are 20 and 39. how many protons are in one atom?

Chemistry
1 answer:
Digiron [165]2 years ago
5 0

Number of protons n one atom of Calcium 39 is 20.

Number of protons in any element is equal to its atomic number. Since the atomic number of calcium is 20, hence, the number of protons is also 20. To balance the positive charge, the atoms contain same number of electrons. Thus, number of electrons in given atom of calcium will also be 20.

The number of neutrons is calculated by performing subtraction between mass number and number of protons. The number of neutrons is indicative of the isotope of atom, as it changes with the mass of an atom.

Calcium is an alkaline earth metal. The smallest unit of matter is atom which can occur either in neutral state or in ionized state.  

Learn more about calculation of number of protons, neutrons and electrons-

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Low-pressure systems usually mean ____ weather.<br> extremely hot<br> cloudy<br> windy<br> fair
eduard

Awnser: The awnser is cloudy

Explanation: I don't have an explanation I just know it

8 0
3 years ago
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Nearly every compound of silicon has the element in the ⁺4 oxidation state. In contrast, most compounds of lead have the element
baherus [9]

Boron shows analogous behaviour with silicon. Every compound of Boron have +3 oxidation state, while as we go down the the oxidation state become +1 and +3. For example, gallium, indium, etc.

Similarly, every compound of silicon has the element in the ⁺4 oxidation state. In contrast, most compounds of lead have the element in the ⁺2 state because of inert pair effect.

<h3>What is Inert pair effect? </h3>

The inert-pair effect is defined as the tendency of two electrons in the outermost atomic s-orbital almost remain unshared in the compounds of the post-transition metals.

<h3>How we calculate Oxidation state? </h3>
  • Each atom in an element either be in its uncombined or free state has oxidation number of zero. Such as each atom in H₂, Cl₂ , P4, ,O₂ , Na, Al, O3, S8, and Mg, all have an oxidation number zero.
  • The oxidation state of ions that comprise of only one atom is the actual charge on the ion.
  • The oxidation state of hydrogen is +1, excluding when it is bonded to metals having two elements. For example, CaH2, its oxidation state is –1.
  • Fluorine and other halogens have an oxidation state equal to –1 when they appear as a form of halide ions in their compounds.

Since the inert pair effect increases as we go down the group and become more predominant, therefore, the stability of +2 oxidation state goes on increasing down the group. Therefore, gallium, indium are mostly found in +1 oxidation state.

Thus, we concluded that Boron shows analogous behaviour with silicon. Every compound of Boron have +3 oxidation state, while as we go down the the oxidation state become +1 and +3. For example, gallium, indium, etc.

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4 0
2 years ago
QUICK PLEASE HELP!!!during a combustion reaction, 5.00 grams of oxygen reacted with 5.00 grams of CH4.
stealth61 [152]
The balanced chemical reaction is:

CH4 + 2O2 —> CO2 + 2H2O

You need to convert mass to moles (divide by molar mass):

CH4 moles = 5 / 16 = 0.31 mol
O2 moles = 5 / 32 = 0.16 mol

To figure out which reactant is limiting, divide the actual moles by the corresponding coefficient in the reaction:

CH4: 0.31 / 1 = 0.31
O2: 0.16 / 2 = 0.08

O2 is the lower number, so it is the limiting reactant. From the reaction we know it takes 2 moles of O2 to react with each mole of CH4. Therefore, for however many moles of O2 we actually have, half as many moles of CH4 will react. Since we have 0.16 mol of O2, only 0.08 mol of CH4 will react, leaving behind 0.31 - 0.08 = 0.23 mol of CH4.

Now convert back to mass (multiply by molar mass) to find the mass of CH4 remaining:

0.23 x 16 = 3.68g

The closest answer is B.
6 0
3 years ago
In water, a strong acid will
dlinn [17]

Answer:

second blank is "partially"

Explanation:

5 0
4 years ago
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Given the solubility, calculate the solubility product constant (ksp) of each salt at 25°c: (a) pbcro4, s = 4.0 × 10−5 g/l; (b)
madreJ [45]
a) PbCrO4:

according to the equation:

PbCrO4(s)  →  Pb2+(aq)   +  CrO42-(aq)

so, Ksp = [Pb2+][CrO42-]

by assuming [Pb2+] = [CrO42-] = X

and when S (the solubility) = 4 x 10^-5 g/L

we have first to convert solubility from g/L to mol/L by getting the molar mass of the salt 

solubility mol/L =  solubility g/L / molar mass of salt

                           = 4 x 10^-5g/L / 323.2 g/mol

                            = 1.24 x 10^-7 mol / L

by substitution in Ksp formula:

∴Ksp = X* X

         = (1.24 x 10^-7)^2

         = 1.54 x 10^-14

b) BaC2O4:

according to this equation:

BaC2O4(s)→  Ba 2+(aq)  +  C2O4 2- (aq)  

So Ksp = [Ba2+][C2O42-]

Assume that [Ba2+] = [C2O42-] = X

when the solubility S =  0.29 g/L = X  , so we need to convert S from g/L to
mol / L 

solubility mol / L= solubility g/L / molar mass of salt

                           = 0.29 g/L / 225.34 g/mol

                           = 0.0013 mol/L

by substitution in ksp formula:

∴Ksp = X^2 

         = (0.0013)^2 

         = 1.69 x 10^-6 

C)  MnCO3: 

according to this equation :

MnCO3(s)→ Mn2+(aq)   +  CO3 2-(aq)

so, Ksp = [Mn2+][CO32-]

assume [Mn2+] = [CO32-] = X

when the solubility s = 4.2 x 10^-6 g/L so we need to convert S from g/L to mol/L by dividing on molar mass.

the solubility mol/L = solubility g/L / molar mass g/mol

                                 =.4.2 x 10^-6 /114.9 

                                 = 3.7 x 10^-8 mol/L

by substitution on ksp formula:

∴ Ksp = X*X

           = (3.7 x 10^-8)^2

           = 1.369 x 10^-15
6 0
3 years ago
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