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4 years ago

How can two atoms have the same mass but different charges?

Chemistry

1 answer:

d1i1m1o1n [39]4 years ago

3 0

The answer is: two atoms have same number of protons and neutrons, but different number of electrons.

Mass number (A) is the total number of protons and neutrons in a nucleus.

Atomic mass (ma) is approximately equivalent to the number of protons and neutrons in the atom.

For example, chlorine atom (Cl) and chlorine anion (Cl⁻).

Similarities:

1) atomic number is the same. Both, chlorine atom and anion, have atomic number 17. They have 17 protons in nucleus of an atom.

2) both are the same element.

Difference:

1) chlorine atom (Cl) has neutral change and chlorine anion (chloride ion Cl⁻) has negative charge, because chlorine anion has one electron more.

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Which of the following is correct for the equation below? 2P(s) + 3Cl2(g) → 2PCl3(g) + 574 kJ

Lilit [14]

It's the first option choice on Plato

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3 years ago

Read 2 more answers

Which requires more heat to warm from 22 c to 85 c, 50.0 g of water mor 200. g of aluminum metal?

Yuki888 [10]

Q=mc(change in temp)
Q is amount of heat, m is mass, c is specific heat

Water:
Q= (50.0g)(4.18 J/g°C)(63°C)
Q= 13167J

Aluminum:
Q= (200.0g)(0.900 J/g°C)(63°C)
Q= 11340J

Water requires more heat

7 0

4 years ago

Rate law equation The rate of a chemical reaction depends on the concentrations of the reactants. For the general reaction betwe

shusha [124]

Answer: The reaction order with respect to A is m

Explanation:

Order of the reaction is defined as the sum of the concentration of terms on which the rate of the reaction actually depends. It is the sum of the exponents of the molar concentration in the rate law expression.

Elementary reactions are defined as the reactions for which the order of the reaction is same as its molecularity and order with respect to each reactant is equal to its stoichiometric coefficient as represented in the balanced chemical reaction.

For the given reaction:

$aA+bB\rightleftharpoons cC+dD$

$Rate=k[A]^m[B]^n$

In this equation, the order with respect to each reactant is not equal to its stoichiometric coefficient which is represented in the balanced chemical reaction.

Hence, this is not considered as an elementary reaction.

Order with respect to A = m

Order with respect to B = n

Overall order = m+n

Thus order with respect to A is m.

3 0

3 years ago

Gastric acid pH can range from 1 to 4, and most of the acid is HCl.

erma4kov [3.2K]

Given the molarity of the solution is $3.03*10^{-2}$ .

The volume of the solution is 10.9/1000 L

Number of moles of HCl = Molarity * volume of the solution in L

Number of moles of HCl = $3.03*10^{-2}$ * $\frac{1000}{10.9}$

Number of moles of HCl = 2.7 moles.

Therefore number of moles of HCl in 10.9 ml of the stomach acid is 2.7 moles

5 0

3 years ago

Which of the following isotopes would most likely be unstable and therefore radioactive?

svlad2 [7]

Answer: Mercury-194 is an unstable isotope and hence is radioactive.

Explanation: Mercury-194 is an isotope of mercury, having formula $_{80}^{194}\textrm{Hg}$

Number of protons in this isotope = 80

Number of neutrons in this isotope = 114

This isotope is radioactive in nature and under decay process by Electron Capture.

Electron capture reactions are the reactions in which a proton in a nucleus absorbs an electron and convert it into neutron. The resulting nucleus will have a decreased atomic number and same atomic mass.

Reaction for electron capture of mercury-194 follows:

$_{80}^{194}\textrm{Hg}+_{-1}^0\textrm{e}\rightarrow _{79}^{194}\textrm{Au}$

6 0

3 years ago