CHEMISTRY HIGH SCHOOL

__________ What is the value of the activation energy for the forward reaction? Be sure to include theappropriate sign.

Answers

Answer 1

Answer:

Answer:

+60 kJ

Explanation:

Activation energy = PE(AB) - PE(A+B) = 100 -40 = +60 kJ

Related Questions

In a group assignment, students are required to fill 10 beakers with 0.720 M CaCl2. If the molar mass of CaCl2 is 110.98 g/mol and each beaker must have 250. mL of solution, what mass of CaCl2 would be used?1)3.13 g 2)38.5 g 3)200 g 4)617 g
Which elements can react to produce a molecular compound?(1) calcium and chlorine(2) hydrogen and sulfur(3) lithium and fluorine(4) magnesium and oxygen
What is the formula for calcium iodine
Express the answer in scientific notation and with the correct number of significant figures: (6.32 x 10-4) ÷ 12.64Your answer should have the same number of significant figures as the starting measurement. 872.4 mm =
Why are some elements more reactive than others?

Calculate the mass of water produced when 2.15 g of butane reacts with excess oxygen in the equation 2C4H10(g)+13O2(g)→10H2O(g)+8CO2(g)

Answers

molar mass :

H₂O = 18.0 g/mol

C₄H₁₀ = 58.0 g/mol

2 C₄H₁₀(g)+ 13 O₂(g) →10 H₂O(g)+ 8 CO₂(g)

2 x ( 58.0) g -------------- 10 x ( 18.0 ) g
2.15 g -------------------- mass of water

mass of water = 2.15 x 10 x 18.0 / 2 x 58.0

mass of water = 387 / 116

mass of water = 3.336 g

hope this helps!

What is the total number of valence electrons in an atom of germanium in the ground state?(1) 8 (3) 14
(2) 2 (4) 4

Answers

The answer is (4) 4. Germanium is a main group element in group 4A. Therefore, like carbon, it has 4 valence electrons in the ground state.

What is the half-life of the substance as determined by the graph?

Answers

Answer:

6.25

Explanation:

Because 2.5 is half and idk know how to explain but yeah

Where is the ion charge located in the isotope symbol?

Answers

The ion charge is located at the top right

Final answer:

In an isotope symbol, the ion charge is generally indicated at the top right corner, so if you have a calcium ion with a +2 charge, the symbol would be Ca²⁺.

Explanation:

In an isotope symbol, the ion charge is generally indicated at the top right corner. The isotope symbol typically includes the atomic number on the lower left, the atomic symbol in the middle, and the mass number on the upper left. If there is an ion charge, it will be indicated on the upper right of the symbol. Suppose you have an ion with a +2 charge, like a calcium ion, it's symbol would be Ca²⁺.

Learn more about Ion Charge here:

brainly.com/question/31961116

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A 1.0 m h2s solution has a ph = 3.75 at equilibrium. what is the value of ka?

Answers

When H2S dissociates in water, it forms 2H+ and S2-. This means the expression of Ka [H+]^2[S2-] / [H2S]. H+ concentration can be derived from the pH thru 10^-pH. This is equal to 1.7783 x10^-4 M. Ka now becomes [1.7783 x10^-4 M]^2*[1.7783 x10^-4 M/2]/ [1.0-1.7783 x10^-4 M] equal to 2.8122 x10^-12.

Answer:

3.16 × 10−8

Explanation:

In the unit cell of galena, six square faces of equal size each form 90 degree angles with every adjacent face. What type of crystal system is this?tetragonal
hexagonal
triclinic
cubic

Answers

Answer : The correct option is, Cubic.

Explanation :

As there are seven types of crystal systems which are cubic, tetragonal, orthorhombic, monoclinic, triclinic, rhombohedral and hexagonal.

A unit cell is characterized by the axial length (a, b and c) and axial angle $(\alpha ,\beta ,\gamma )$ parameters which decide the size and shape of the unit cell.

In tetragonal crystal system, $a=b\neq c$ and $\alpha=\beta=\gamma=90^o$

In hexagonal crystal system, $a=b\neq c$ and $\alpha=\beta=90^o,\gamma=120^o$

In triclinic crystal system, $a\neq b\neq c$ and $\alpha\neq \beta\neq \gamma=90^o$

In cubic crystal system, $a=b=c$ and $\alpha=\beta=\gamma=90^o$

Hence, the correct option is, Cubic.

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When dissolved in water, all acids willA. Form hydroxide ions B. have a negative eletrical charger C. conduct eletricity D. turn blue

Boyle's law states that thea. volume of a gas varies inversely with pressure. b. volume of a gas varies directly with pressure. c. temperature of a gas varies inversely with pressure. d. temperature of a gas varies directly with pressure.

What is the length of time an organism is expected to live?