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Helen [10]
2 years ago
6

A scientist claims to have discovered an element with 30 protons in its nucleus. He determines it has 60 electrons. Why is his i

nformation False?
A.The number of electrons is always equal to the number of protons in its outer shell.
B.The number of protons, the number of neutrons, and the number of electrons are always equal.
C.The number of electrons in an atom of an element is always the same as the number of protons in its nucleus.
D.The number of electrons in an atom of an element is always half of the number of the protons in its nucleus.
Chemistry
2 answers:
Brrunno [24]2 years ago
6 0

Answer:

the number of electrons in an atom of an element is always the same as the number of protons in its nucleus

UNO [17]2 years ago
4 0

The number of electrons in an atom of an element being always the same

as the number of protons in its nucleus is False.

<h3>What is an Electron?</h3>

This is a sub-atomic particle which is negatively charged and is usually

involved in chemical reactions.

Electropositive elements donates electrons while electronegative

elements accepts electrons during chemical reactions which is why the

number of proton and electron aren't always the same.

Read more about Electrons here brainly.com/question/900457

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1.How many mL of 0.401 M HI are needed to dissolve 5.97 g of BaCO3?
garri49 [273]

Answer:

The answer to your question is:

1.- volume = 0.151 l or 151 ml

2.- 0.241 l  or 241 ml of NaOH

Explanation:

1.-

Data

V = ? HI = 0.401 M

BaCO3 = 5.97 g

                     2HI(aq)    +    BaCO3(s)   ⇒   BaI2(aq) + H2O(l) + CO2(g)

MW BaCO3 = 137 + 12 + 48 = 197 g

                     197 g of BaCO3 ----------------- 1 mol

                     5.97 g                -----------------   x

                     x = (5.97 x 1) /197

                    x = 0.03 mol of BaCO3

                    2 moles of HI ----------------  1 mol of BaCO3

                    x                     ----------------  0.03 mol of BaCO3

                    x = (0.03 x 2) / 1

                   x = 0.060 mol of HI

Molarity = moles / volume

volume = moles / molarity

volume = 0.060 / 0.401

volume = 0.151 l or 151 ml

2.-

V = ?    NaoH 0.757 M

Co⁺² Volume = 167 ml   0.548 M

             CoSO4(aq) + 2NaOH(aq)   ⇒   Co(OH)2(s) + Na2SO4(aq)

Moles of Co = Molarity x  volume

Moles of Co = 0.548 x 0.167

Moles of Co = 0.092

                                 1 mol of CoSO4 -------------- 2 moles of NaOH

                                0.092 moles      ---------------   x

                                x = (0.092 x 2) /1

                               x = 0.183 moles of NaOH

Volume of NaOH = moles / molarity

                             = 0.183 / 0.757

                            = 0.241 l  or 241 ml of NaOH

6 0
3 years ago
If 10.7 grams of NH4Cl is dissolved in enough water to make 800 mL of solution,what will be it's molarity
Ksju [112]
<h3><u>Answer;</u></h3>

Molarity = 0.25 M

<h3><u>Explanation;</u></h3>

Molarity is given by moles/Liter.

First we find moles:

Number of moles = Mass /molar mass

= (10.7g NH4Cl)/(53.5g/mol NH4Cl)

= 0.200 moles NH4Cl  

Then  we convert to liters:

= (800mL)*(1L/1000mL) = 0.800L  

Therefore; molarity = 0.2moles/0.8L

                                = 0.25M

4 0
3 years ago
Which parameters can you change to affect the rate of the reaction? in alphabetical order, list all that apply to this system.?
postnew [5]
Catalyst 
Concentration 
Temperature
6 0
3 years ago
PLEASEEE HELPP I BEGG FOR HELPPP
Basile [38]

Answer:

An element that is oxidized is a reducing agent, because the element loses electrons, and an element that is reduced is an oxidizing agent, because the element gains electrons.

7 0
3 years ago
Read 2 more answers
Why the two isotopes of bromine have the same chemical properties.
nalin [4]

Answer:

Isotopes of bromine have same chemical properties because they have same number of electrons.

Isotopes have only different number of mass that does not affect it's chemical properties too much.

3 0
3 years ago
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