Answer:
Explanation:
Catalysts lower activation energy. TRUE.
They provide an alternate pathway with a lower activation energy.
Catalysts are consumed by the overall reaction. FALSE.
They take part in the reaction, but they can be recovered unchanged at the end.
Catalysts speed up the chemical reactions. TRUE.
If the activation energy is lowered, a greater percentage of the molecules will have enough energy to get over the energy barrier.
Its like lowering the high-bar in a track and field meet. The lower the bar, the more athletes will be able to get over it.
PH is a scale of how much ionic hydrogen is in a substance. The scale runs from 0 to 14. The lower the number on the scale, the more acidic the substance is (that means there are more hydrogen ions than hydroxide ions). The higher the number on the scale, the more basic the substance is (that means that there are more hydroxide ions than hydrogen ions).
Answer:
2 electrons
8 electrons
8 electrons
1 electron (just count in the rings for these ones)
19 protons (it says "P=19" in the middle. The P stands for Protons)
K (it's from Latin medieval Latin "kalium")
39 (add proton and neutron amounts to get the approximate atomic mass--electrons are negligible)
Explanation:
C6H6 + 15/2O2 = 6CO2 + 3H2O/×2
2C6H6 + 15O2 = 12CO2 + 6H2O
Answer:
4.79x10¹³s⁻¹
Explanation:
For a first order reaction, the graph of ln k against 1/K follows Arrhenius equation:
lnK = ln A - Ea/RT
<em>Where A is pre-exponential factor, Ea is activation energy, R gas constant and T is absolute temperature</em>
<em />
If you graph ln k = y and 1/T = x:
y = lnA - Ea/R x
<em>Where the slope = -Ea/R</em>
<em>And the intercept = lnA</em>
<em />
To solve the pre-exponential factor:
31.5 = lnA
e^31.5 =
<h3>4.79x10¹³s⁻¹</h3>
s⁻¹ because the reaction is first order.