Arrhenius

What is the Arrhenius Equation?

Answer explanation

k = rate constant

A = pre-exponential factor (number of properly-oriented collisions)

e = base of natural logarithms (2.71828...)

Ea = activation energy (kJ/mol)

R = gas constant = 8.314 J/K*mol

T = temperature (K)

Tags

NGSS.HS-PS1-5

What equation can be used to compare the rate constant k at two different temperatures?

Answer explanation

1) ln on each side

2) ln(xy) = ln(x) + ln(y)

3) ln(e^x) = x

4) compare

5) cross out same values, divide same values = 1

Tags

NGSS.HS-PS1-5

What is the y-axis of an Arrhenius plot?

Answer explanation

ln(k) = -Ea/RT + ln(A)

ln(k) = -Ea/R(1/T) + ln(A)

y = mx + b

Tags

NGSS.HS-PS1-5

Answer explanation

35 = 3.5 x 10^1

round to nearest odd number

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Nitinol (nickel titanium) is a common material in medical devices due to its biocompatibility and shape memory. How many times faster will the oxidation of Nitinol occur at 850 degrees Celsius than at 650 degrees Celsius if the activation energy is 203 kJ/mol? (round sigfigs at the end)

Answer explanation

111 = 1.1 x 10^1

remember to convert to correct units:

T = Kelvin

R = kJ/mol*K

Tags

NGSS.HS-PS1-5

How many times faster will a catalyzed reaction occur at 25 degrees Celsius if the activation energy of the uncatalyzed reaction is 85 kJ/mol and the catalyzed reaction has an activation energy of 65 kJ/mol? (round sigfigs at the end)

Answer explanation

given 2 different Ea and same temperature, so use this equation.

Catalyzed on top because told it is faster (and as we can see from smaller Ea)

Tags

NGSS.HS-PS1-5

They are - substances that ionize (break off) in an aqueous solution to produce hydrogen (H⁺) ions

• Acid - Lewis

• Base - Bronsted Lowery

• Acid - Arrhenius

• Base - Arrhenius

• Acid - Lewis

They are substances that ionize (break off) in an aqueous solution to produce hydroxide (OH^-) ions in solution according to _____.

• Acid - Bronsted Lowry

• Base - Bronsted Lowery

• Acid - Arrhenius

• Base - Arrhenius

• Acid - Lewis

What specific substance has the ability to act as an acid or base

• Hydronium Ion

• Hydroxide Ion

• Water

• Ammonia

What is the Arrhenius definition of an acid?

• A substance that donates protons in a solution

• A substance that accepts protons in a solution

• A substance that increases the concentration of hydrogen ions in a solution

• A substance that increases the concentration of hydroxide ions in a solution