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Naddika [18.5K]
3 years ago
11

When do you identify your variables?

Chemistry
2 answers:
Alekssandra [29.7K]3 years ago
3 0
Option numberrrr C I THINK
Natasha2012 [34]3 years ago
3 0

Answer:

Before the hypothesis

Explanation:

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Answer:

the answer is B-2nd; stars

Explanation:

7 0
3 years ago
For the gas phase decomposition of 1-bromopropane, CH3CH2CH2BrCH3CH=CH2 + HBr the rate constant at 622 K is 6.43×10-4 /s and the
ladessa [460]

<span>Answer is: activation energy of this reaction is 212,01975 kJ/mol.
Arrhenius equation: ln(k</span>₁/k₂) = Ea/R (1/T₂ - 1/T₁<span>).
k</span>₁<span> = 0,000643 1/s.
k</span>₂ = 0,00828 1/s.

T₁ = 622 K.

T₂ = 666 K.

R = 8,3145 J/Kmol.

1/T₁<span> = 1/622 K = 0,0016 1/K.
1/T</span>₂<span> = 1/666 K = 0,0015 1/K.
ln(0,000643/0,00828) = Ea/8,3145 J/Kmol · (-0,0001 1/K).
-2,55 = Ea/8,3145 J/Kmol · (-0,0001 1/K).
Ea = 212019,75 J/mol = 212,01975 kJ/mol.</span>

4 0
3 years ago
Which isotope is most commonly used in the radioactive dating of the remains of organic materials?
Zarrin [17]
(1) 14C also known as Carbon-14, is used to radio-date organic materials as well as earth materials.
8 0
2 years ago
Electron transfer is the term for this process. The resulting anion and cation are attracted by Coulombic forces and an ionic co
Nitella [24]
<h2>The compound formed is NaCl and CaCl_{2}</h2>

Explanation:

     PART 1:

  • Atomic number of sodium is 11.
  • Sodium(Na, Z = 11, Group 1A) will lose 1 electron to become Na^{1+} which is isoelectronic to Neon (Ne ,Z = 10).
  • The symbol for the sodium ion is Na^{+}.
  • Chlorine atom (Cl, Z = 17, Group 7A or 17) gains 1 elecron to be  isoelectronic to neon.
  • The symbol for the compound formed is NaCl.
  • PART 2:
  • Atomic number of calcium is 20
  • Calcium(Ca, Z = 20 ,Group 2A) will lose two electrons to become Ca^{2+}which is isoelectronic to argon.
  • The symbol for the ion is Ca^{2+}.
  • Two chlorine atoms (Cl, Z = 17, Group 7A or 17) each gains one electron to be isoelectronic to argon(Z = 18)
  • The symbol for the compound formed is CaCl_{2}.
8 0
3 years ago
What makes up a film badge?
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Film badges is a personal dosimeter used for monitoring cumulative radiation dose due to ionizing radiation.

A panel or layers of photographic film covered with black paper and exposed to air ,salt,and other chemicals on clear acetate

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