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frez [133]
2 years ago
11

Help me please with these two questions

Chemistry
2 answers:
V125BC [204]2 years ago
6 0
I can’t rlly see it
jeka942 years ago
5 0

The first question is isotopes

Explanation:

Elements that have the same atomic number but different atomic masses are isotopes. isotopes of the same element have nearly identical chemical properties (because they have the sme numberof protons and electrons). their only difference is the number of neutrons, which changes their nuclear properties like radioactivity.

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The movement of tectonic plates is so slow and gradual that you cannot see or feel them moving. As a result, scientist depend on
guapka [62]

Answer:

centimeters per year

Explanation:

5 0
2 years ago
an element "x" has the election configuration 2,8,3 this element is found in ______group and_____period A.3,llla B.llla,3 C.vlla
iogann1982 [59]

This element is found in group 3A, period 3

<h3>Further explanation </h3>

The maximum number of electrons that can be filled in the nth electron shell is 2n²(n=shell)

  • K shell (n = 1) maximum 2 x 1² = 2 electrons
  • L shell (n = 2) maximum 2 x 2² = 8 electrons
  • M shell (n = 3) maximum 2 x 3² = 18 electrons
  • N shell (n = 4) maximum 2 x 4² = 32 electrons

Electron configuration of element X : 2.8.3 , so :

K shell = 2 ⇒1s²

L shell = 8⇒2s²2p⁶

M shell = 3⇒ 3s²3p¹

Block p: group 13-18 (has a 2p-6p configuration), also called a representative element because it includes metals, non-metals and metalloids

The outer shell 3s²3p¹ : located in group 3A and period 3

group⇒valence electron ⇒3

period⇒the greatest value of the quantum number n⇒3

3 0
3 years ago
Which of the following equations are balanced?
Law Incorporation [45]
A: 2H₂ + O₂ → 2H₂O

    H: 4            H:4
    O: 2           O: 2

The equation is balanced.

B. 2S + 3O₂ → 2SO₃

     S: 2             S: 2
     O: 6            O: 6

The equation is balanced.

C. Li + Cl₂ → LiCl

     Li: 1          Li: 1
    Cl: 2          Cl: 1

The equation is not balanced.

    2Li + Cl₂ → 2LiCl

    Li: 2            Li: 2
    Cl: 2           Cl: 2

D: 2K + 2H₂O → H₂ + 2KOH

    K: 2                 K: 2
    H: 4                 H: 4
    O: 2                 O: 2

The equation is balanced.

E: 2Fe + Cu(NO₃)₂ → 2Cu + Fe(NO₃)₂

    Fe: 2                       Fe: 1
    Cu: 1                      Cu: 2
      N: 2                        N: 2
      O: 6                        O: 6

The equation is not balanced.

2Fe + 2Cu(NO₃)₂ → 2Cu + 2Fe(NO₃)₂

Fe: 2                        Fe: 2
Cu: 2                       Cu: 2
  N: 4                         N: 4
  O: 12                       O: 12

The following equations that are balanced are A, B, and D.
6 0
3 years ago
A 3.0 l container holds a sample of hydrogen gas at 300 k and 100 kpa. if the pressure increases to 400 kpa and the volume remai
Dahasolnce [82]
    The  temperature will  be  1200K   if  the volume remained   constant

      calculation
 This is calculated  using   gay lussac  law  formula,  that is P1/ T1=P2/T2  since the   volume is constant
P1 =  100 Kpa
T1=  300 K
P2=  400 Kpa
T2=?

by  making  T2   the subject of the formula  T2 =( P2 xT1)/P1

T2  is therefore = (400 KPa  x 300 K)  / 100 Kpa = 1200 K
4 0
2 years ago
Read 2 more answers
Which of the following is used to break Water down to its elements:
nydimaria [60]
A i’m guessing!
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4 0
2 years ago
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