CHEMISTRY MIDDLE SCHOOL

The following mechanism has been proposed for the gas-phase reaction of chloroform (CHCl3) and chlorine:Step 1: Cl2(g)⇌2Cl(g)(fast)
Step 2: Cl(g)+CHCl3(g)→HCl(g)+CCl3(g)(slow)
Step 3: Cl(g)+CCl3(g)→CCl4(fast)

What is the overall rate constant?

Answers

Answer 1
Answer: The question is asking to compute the overall rate constant of the said gas phase reaction of chloroform (CHC13) and chlorine, base on the fact, I would say that the answer would be R= k [Cl] [CHCl3]. I hope you are satisfied with my answer and feel free to ask for more 

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When an electric kettle containing cold water is switched on, the water in it starts boiling after a few minutes. What is the source of the heat energy of the boiling water? (3 points)a. Mechanical energy from the power socket b. Newly created energy that increased the total energy c. Mechanical energy from the heating element in the kettle d. Already existing energy that was present in some other form
What is the color of the indicator thymol blue in a solution that has a pH of 11?(1) red (3) pink (2) blue (4) yellow
Fernando places 50 mL of HCl in a 100 mL beaker and 50 mL of NaOH in a 100 mL beaker. he places them on a scale together and measures a combined mass of 15.00 grams. he then mixes the liquids together and waits five minutes while they react. to make the HCl used in the experiment, Fernando mixed 10 mL of HCl with 40 mL of water. what are the properties of this mixture? select all that apply.A. The H2O is the solute. B. The HCl is the solute. C. TheHCL is the solvent. D. The H2O is the solvent. E. This mixture conducts electricity. F. This mixture does not conduct electricity. help!
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What human body system can be fossilized? Explain

What does soil have to do with rock

Answers

Soil is made up of tiny bits of crushed rock and organic material.
Soil is made up of tiny bits and crushed rocks but other than that soil has nothing to do with rocks when people generally think about soil it has to do with farming agriculture etc. nothing  to do with rocks. One other thing mining has to do with soil and rocks so probably mining

When glucose is consumed, it reacts with oxygen in the body to produce carbon dioxide, water, and energy. How many grams of carbon dioxide would be produced if 45g of C6H12O completely reacted with oxygen

Answers

Answer:

There will be produced 66g of CO2 if 45g of glucose completely reacted with oxygen

Explanation:

Step 1 : Balance the formula

Oxidation of glucose can be shown in the following equation :

C6H12O6  + 6 O2  → 6 CO2 + 6H2O

This means that for 1 mole glucose that react there will react 6 moles of O2, to form 6 moles of CO2 and 6 moles of H2O

Step 2: Calculating moles

mole glucose = 45g / Molar mass glucose

   ⇒ Molar mass = 6*12 + 12*1 + 6*16 = 72 + 12 + 96 = 180g/mole

⇒ mole glucose = 45g / 180g/mole

⇒mole glucose = 0.25 mole

Since 1 mole of glucose is used to form 6 moles of CO2

0.25 mole of glucose is used to form 1.5 moles of CO2

Step 3 : Calculating mass of Carbon dioxide

Mass of CO2 = 1.5 moles of CO2 * 44 g/mole

mass of CO2 = 66g

There will be produced 66g of CO2 if 45g of glucose completely reacted with oxygen

Final answer:

If 45g of glucose reacts with oxygen, 66.015 grams of carbon dioxide would be produced. This calculation is based on converting the mass of glucose to moles, using the stoichiometry of the balanced chemical equation, and then calculating the mass of CO2 produced.

Explanation:

When glucose (which has the chemical formula C6H12O6) is consumed, it reacts with oxygen to produce carbon dioxide, water, and energy. The chemical equation for this reaction is C6H12O6 + 6 O2 → 6 CO2 + 6 H2O. Given that 45g of C6H12O6 completely reacts with oxygen, we need to calculate the mass of carbon dioxide produced from this reaction.

To do this, we first need to determine the molar mass of glucose, which is 180.16 g/mol. This means that 1 mole of glucose weighs 180.16 grams. We can then find out how many moles of glucose 45g represents by dividing 45g by 180.16 g/mol, which gives us 0.25 mol of glucose.

According to the chemical equation, 1 mole of glucose produces 6 moles of CO2. Therefore, 0.25 moles of glucose would produce 0.25 × 6 = 1.5 moles of CO2. The molar mass of CO2 is 44.01 g/mol, so the mass of CO2 produced by 0.25 moles of glucose is 1.5 moles × 44.01 g/mol, resulting in 66.015 grams of CO2. So, if 45g of C6H12O6 completely reacted with oxygen, 66.015 grams of CO2 would be produced.

A rock at the top of a 30 meter cliff has a mass of 25 kg. Calculate the rock’s gravitational potential energy when dropped off the cliff. Assuming that energy is conserved and there is no air friction and gravity is 9.8 m/sec., at the bottom of the cliff the rock’s potential energy is completely converted to kinetic energy. Use the formula for kinetic energy to calculate the rock’s speed at the bottom of the cliff. Show all calculations.

Answers

Lets see:-

We have our formula for potential energy, which we are trying to solve for, 

PE = mgh  or  potential energy = mass * gravity * height

So we know that PE all depends on these. 

Height :  30 meters
Mass : 25 kg
Gravity (which is always constant) : 9.8 m/s/s

Now add into formula. 

PE = 25*30*9.8 
PE = 7350 Joules

Answer: PE = 7350 Joules

Now calculate speed:-

7,350 joules/12.5 kg  =  speed-squared
 588 m²/s²  =  speed-squared
 about 24.248 m/s

Which of the following electromagnetic waves are listed in the correct order from longest wavelength to shortest wavelength? A.
infrared, ultraviolet, visible


B.
visible, infrared, ultraviolet


C.
ultraviolet, visible, infrared


D.
infrared, visible, ultraviolet

Answers

Answer;

D.

infrared, visible, ultraviolet

Explanation;

Electromagnetic waves are types of waves that do not require a material medium for transmission. An electromagnetic spectrum arranges these electromagnetic waves in the order of increasing frequency and decreasing wavelength.

The spectrum consists of , Radio waves, microwaves, infrared, visible light, UV light, X-rays and Gamma rays; arranged in order of decreasing wavelength and increasing frequency.

Radio waves have the longest wavelength but the lowest frequency, while gamma rays have the lowest wavelength but the largest frequency.

Answer: D.  infrared, visible, ultraviolet

Explanation:

just took the test

What effect does observing a substances physical properties have on the substance

Answers

no effect. only chemical properties change the substance when they are tested

What type of allele masks the expression of the recessive allele?

Answers

The Dominant trait or allele masks the recessive because it is dominant. an easy way to remember this is how the lead wolf (dominant alleles) shows it's dominance over the rest of the pack (the recessive alleles)
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