Answer:
energy
Explanation:
The First Law of Thermodynamics (Conservation) states that energy is conserved, it cannot be created nor destroyed.
2 A
3 C
4 B
That were the answers to mine

QUESTION:- Mrs. Smith wrote down a chemical equation on the board and stated that mass is conserved in the reaction. What did she mean?
ANSWER:- There are equal numbers of atoms on both sides.
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Answer:
Activation energy, Ea, for the reaction 261.7 kj/mole
Explanation:
Given
Rate constant at 470 ⁰C (K₁) = 1.10 x 10⁻⁴ s⁻¹ and rate constant at 500⁰C (K₂) = 5.7 x 10⁻⁴ s⁻¹
Temperature (T₁) = 470 + 273 = 743 K and
temperature (T₂) = 500 + 273 = 773 K
Activation energy (Eₐ) = ?
Universal gas constant (R) = 8.314 J. K⁻¹. mole⁻¹
We know log
= 

⇒ log
=

⇒ 0.714 = 
⇒ Eₐ =
j/mole = 261.7 Kj/mole