CHEMISTRY HIGH SCHOOL

Which phrase describes an activated complex?

Answers

Answer 1
Answer:

high energy and unstable
Answer 2
Answer: How is it? The activated complex is the structure at the maximum energy point along the reaction path; the activation energy is the difference between the energies of the activated complex and the reactants.

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How will an energy diagram look for an exothermic reaction?The reactants and products will be at the same potential energy. The reactants are at a higher potential energy compared to the products. The reactants are at a lower potential energy compared to the products. There will not be an activation energy barrier.
What chemical change is magnetizing steel
A heterogeneous mixture is one in which substances are evenly distributed and have a uniform composition
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For a particular reaction, ΔH = -144.6 kJ and ΔS = -301.2 J/K. Calculate ΔG for this reaction at 298 K.

Which aqueous solution of KI freezes at the lowest temperature?(1) 1 mol of KI in 500. g of water
(2) 2 mol of KI in 500. g of water
(3) 1 mol of KI in 1000. g of water
(4) 2 mol of KI in 1000. g of water

Answers

The answer is (2) 2 mol of KI in 500. g of water.. This is a question of colligative properties. Boiling point elevation and freezing point depression depend on the concentration of dissolved solute. You would get the greatest concentration of KI with the largest moles of KI and smallest volume of water.

In the equation N2(g) + 3H2(g) → 2NH3(g), how many liters of hydrogen combines with 10 liters of nitrogen?

Answers

5 hydrogens combine is the answer

A 134.0 g sample of an unknown metal is heated to 91.0⁰C and then placed in 125 g (125 mL) of water at 25.0⁰C. The final temperature of the water is measured at 31.0⁰C. Calculate the specific heat capacity of the unknown metal.

Answers

Answer:

The specific heat capacity of the metal is approximately 0.3903 J/(g·°C)

Explanation:

The mass of the sample of the unknown metal, m_m = 134.0 g

The temperature to which the metal is raised, t_m = 91.0°C

The mass of water into which the mass of metal is placed, m_w = 125 g

The temperature of the water into which the metal is placed, t_w= 25.0°C

The final temperature of the water, t_f = 31.0°C

The specific heat capacity of water, c_w = 4.184 J/(g·°C)

The specific heat capacity of the metal =  c_m

Therefore, by the first laws of thermodynamics we have;

The heat transferred = Heat supplied by the metal = Heat gained by the water

The heat transferred, ΔQ, is given as follows;

ΔQ = m_w×c_w×(t_f - t_w) = m_m× c_m×(t_m - t_f)

125 × 4.184 × (31 - 25) = 134 × c_m × (91 - 31)

∴ c_m = (125 × 4.184 × (31 - 25))/(134 × (91 - 31)) ≈ 0.3903 J/(g·°C)

The specific heat capacity of the metal =  c_m ≈ 0.3903 J/(g·°C)

Mindy and her lab partner conducted flame tests of several metallic salt solutions. They dipped a wire loop into each salt solution, and one by one, heated the sample in the Bunsen burner flame. Based on their results, which element produced a colored light with the lowest energy?A) barium
B) calcium
C) copper
D) potassium

Answers

Flame tests of metals produce various colors. The colors produced by each of the choices are:

A. barium - pale green
B. calcium - yellow red
c. copper - green blue
d. potassium - lilac

Using the visible light spectrum, it can be determined that the metal with the lowest energy is B. calcium. This is because the color yellow-red is near the end of the spectrum with the longest wavelength. Since wavelength is inversely proportional to energy, calcium has the lowest energy.

Answer:

B

Explanation:

The color of the emitted light depends on the energy. According to the arrangement of the electromagnetic spectrum, the color red has the lowest energy, the lowest frequency, and the largest wavelength

If you make an electromagnet using a battery circuit and a steel nail, how can you increase its magnetic strength? A. replace the nail with a copper rod B. wrap more coils of wire around the nail C. use a longer nail D. remove the plastic insulation from the wire coil

Answers

The correct answer is (b.) wrap more coils of wire around the nail. If you make an electromagnet using a battery circuit and a steel nail, you can actually increase its magnetic strength by wrapping more coils of wire around the nail.

How do you tell if a reaction is endothermic or exothermic using only the written formula

Answers

You know if it's endothermic or exothermic by doing the enthalpy reaction. If the change of temperature is negative then it is exothermic, while positive is endothermic. If you get -22K then its exothermic, but if you get +22 its endothermic.
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