Which one of these is not involved in a Combustion reaction ?
- production of water h20
-Usually, requires activation energy-to get started
-Requires a Fuel
-Production of Carbon Dioxide CO2
-Evolution of a gas (usually bubbles)
-Requires oxygen ( O2) gas as a reactant
Answers
One of these is not involved in a Combustion reaction is a. The production of water (H²O) is not involved in a combustion reaction.
Combustion reactions are typically exothermic reactions that involve a fuel, oxygen gas (O²), and activation energy to get started. During the reaction, the fuel is oxidized by the oxygen gas, resulting in the production of heat, light, and usually the production of carbon dioxide (CO²) as a byproduct. Evolution of gas, such as the formation of bubbles, is also common in combustion reactions.
However, water is not produced as a byproduct of the reaction, as it is not involved in the oxidation of the fuel. In fact, water is commonly used to extinguish fires caused by combustion reactions, as it can cool the reaction and prevent further oxidation of the fuel. So therefore the correct answer is a. the production of water (H²O) is not involved in a combustion reaction.
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Related Questions
What is the chemical formula for chlorous acid?
Answers
Aluminum metal reacts with solid sulfur to produce solid aluminum(III) sulfide.
Answers
The chemical equation when aluminum metal reacts with solid sulfur to produce solid aluminum(III) sulfide would be \(2Al (s) + 3S (s) -- > Al_2S_3 (s)\)
Chemical equationThe reaction between aluminum metal and solid sulfur to produce aluminum (III) sulfide would be as follow:
The chemical symbol of aluminum metal = Al
The chemical symbol of sulfur = S
Aluminum has a valence electron of 3 while sulfur has a valance electron of 2. In order to form a bond between them, the valence electron of one becomes the subscript of the other. In other words, aluminum receives the valence of sulfur (2) while sulfur receives the valence of aluminum (3). Thus:
\(2Al +3 S --- > Al_2S_3\)
When all the phases are considered, the equation becomes: \(2Al (s) + 3S (s) -- > Al_2S_3 (s)\)
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Aluminum metal reacts with solid sulfur to produce solid aluminum(III) sulfide. Express your answer as chemical equations. identify all the phases in your answer.
what is causing the marshmallow to change their sate of matter
Answers
Answer:
Any form of semi high energy waves cause the water molecules inside the marshmallow to vibrate which heat and soften the sugar matrix inside the marshmallow. The weakened sugar matrix allows air bubbles within the marshmallow to expand rapidly and the marshmallow puffs up and becomes goo. If this proccess is repeated it can completly change it's state of matter.
Explanation:
feel free to answer
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The accepted value for the boiling point of water is 100˚C. During an experiment, students recorded the temperature observations listed below. Which one is the most accurate temperature for the boiling point of water?
A.) 103°
B.) 102°
C.) 95°
D.) 97°
Two students need to determine the density of iron for part of an experiment. Using the information in the table below, calculate the average of each student's trials. Which student has the most precise set of measurements? Which student's average is the most accurate?
A.) Felipe's measurements are more precise and his average is more accurate.
B.) Sarah's measurements are more precise and her average is more accurate.
C.) Sarah's measurements are more precise but Felipe's average is more accurate.
D.) Felipe's measurements are more precise but Sarah's average is more accurate.
Suppose you work at a theme park. Your supervisor wants you to make a sign displaying the maximum weight that a roller coaster train can carry. Your supervisor knows that the maximum weight is 1686.5 kg. However, he wants the sign to be quickly understood and tells you to make a sign that says: Maximum Weight 1700 kg. How could the lack of precision in this example cause problems?
Answers
The option that is accurate temperature for the boiling point of water is option D.) 97°.
The student has the most precise set of measurement is option A.) Felipe's measurements are more precise and his average is more accurate.
What Is it true about the boiling point of water is 100 degrees Celsius?In regards to temperature, At sea level, water tends to boils at 100° C ( that is at 212° F).
Note that At higher altitudes the temperature of the boiling point is said to be lower.
Therefore, one can say that The option that is accurate temperature for the boiling point of water is option D.) 97°.
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HELP PLEASE!!!!
photo above 16POINTS
+ Brainliest
I need help with questions 3 and 5 if you can’t answer one that’s OK I just need help!!!!
Someone please help some out here
Answers
Answer:
32.09 amu is that an option i’m pretty sure that’s right but i would try and make sure
Explanation:
PLEASE HELP ASAP
What type of
orbital does the
image
represent?
A. s subshell
B. p subshell
C. f subshell
D. d subshell
Answers
which one of the following compounds is insoluble in water? question 2 options: ca cl2 nano3 pb cl2 k2co3
Answers
PbCl2 is insoluble in water.
To determine which one of the following compounds is insoluble in water, let's evaluate each option:
1. CaCl2 (Calcium chloride)
2. NaNO3 (Sodium nitrate)
3. PbCl2 (Lead(II) chloride)
4. K2CO3 (Potassium carbonate)
According to solubility rules, most chloride (Cl-) salts are soluble, with some exceptions like AgCl, PbCl2, and Hg2Cl2. Most nitrate (NO3-) salts and alkali metal salts (like those containing Na+ and K+) are soluble in water.
Based on these rules:
- CaCl2 is soluble (calcium chloride)
- NaNO3 is soluble (sodium nitrate)
- K2CO3 is soluble (potassium carbonate)
However, PbCl2 (lead(II) chloride) is an exception and is considered insoluble in water.
So, the answer to your question is: PbCl2 (Lead(II) chloride) is the compound that is insoluble in water among the given options.
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________ is produced in the stomach and stimulates food intake.
Select one:
a. Peptide PYY
b. Cholecystokinin
c. Gastrin
d. Ghrelin
e. No answer is correct
Answers
Answer:
Ghrelin
Explanation:
Ghrelin is produced in the stomach and stimulates food intake. The correct option is d.
Ghrelin is a hormone produced in the stomach that stimulates food intake. It is often referred to as the "hunger hormone" because it plays a crucial role in regulating appetite. When the stomach is empty, ghrelin levels increase, signaling the brain to initiate feelings of hunger and promote eating. Once the stomach is full, ghrelin levels decrease, reducing the desire to eat and contributing to feelings of satiety.
The other options, Peptide PYY, Cholecystokinin, and Gastrin, are not primarily responsible for stimulating food intake. Peptide PYY is an appetite-suppressing hormone released by the intestines in response to food consumption, helping to induce feelings of fullness. Cholecystokinin, another hormone secreted by the small intestine, plays a role in digestion and also contributes to satiety. Gastrin, produced in the stomach, is primarily involved in stimulating the secretion of gastric acid, which aids in the breakdown of food during digestion.
In summary, ghrelin is the hormone produced in the stomach that stimulates food intake, making option d the correct answer.
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If a car travels 20 miles in 2 hours, how fast is the car driving?
Answers
Answer: distance by time
20/2=10
Explanation:
What is the correct Lewis structure for carbon monoxide?
Answers
Answer: option B
Explanation:
Option B, because in carbon monoxide both carbon and oxygen contain a lone pair in their valence shells.
Hope that helps
Which of the following are correct for first-order reactions? Select all that apply?
a. The reaction slows down as the reaction proceeds. ?
b. A higher concentration of reactants will speed up the reaction. ?
c. The concentration of the reactants changes nonlinearly.
d. The half-life of the reaction stays constant as the reaction proceeds The units for the rate constant and the rate of reaction are the same.
Answers
The reaction slows down as the reaction proceeds and The half-life of the reaction stays constant as the reaction proceeds. Therefore the correct option is option A and D.
The rate of a first-order reaction is inversely proportional to the reactant concentration. The concentration of the reactant falls over the course of the reaction, which slows down the rate of the reaction.
However, the reaction's half-life is constant, which means that no matter where in the reaction it occurs, the length of time needed for half of the reactant's starting concentration to be consumed is the same.
The units of the rate constant for a first-order reaction are the same as the units for the reaction's rate, such as s-1 or min-1.
Reactant concentration changes linearly rather than nonlinearly. Therefore the correct option is option A and D.
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What is the absolute pressure if the gauge pressure is 100 kPa?.
Answers
If the gauge pressure is 100 kPa, then the absolute pressure will be 201.3 kPa.
Gauge pressure is the pressure measured relative to atmospheric pressure. Absolute pressure is the total pressure that is being exerted on a given surface, including both atmospheric pressure and any additional pressure from a source, such as a fluid or gas. It is always positive and is measured relative to a perfect vacuum, which has an absolute pressure of 0 kPa.
To determine the absolute pressure when the gauge pressure is known, we need to add the gauge pressure to the atmospheric pressure. The standard atmospheric pressure at sea level is around 101.3 kPa.
So, if the gauge pressure is 100 kPa, we can find the absolute pressure by adding the atmospheric pressure of 101.3 kPa to the gauge pressure.
Absolute Pressure = Gauge Pressure + Atmospheric Pressure = 100 kPa + 101.3 kPa = 201.3 kPa
Therefore, the absolute pressure in this scenario is 201.3 kPa.
It's important to note that the units of gauge pressure and absolute pressure are different. Gauge pressure is typically measured in kilopascals (kPa), pounds per square inch (psi), or atmospheres (atm), while absolute pressure is measured in units such as kilopascals absolute (kPaA) or pounds per square inch absolute (psia).
In summary, absolute pressure is the total pressure that is being exerted on a given surface, including atmospheric pressure and any additional pressure from a source.
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What is the Sl unit for energy? Be sure to give the full name for the unit
Answers
Answer:
Joules
Explanation:
What do you think makes fireworks different colors?
Answers
Answer: different metal salt being heated I believe
Explanation:
The reaction gives off different color for example barium chloride gives a green color
Answer:
They’re created by the use of metal salts. These salts are different from table salt, and in chemistry ‘salt’ refers to any compound that contains metal and non-metal atoms. Some of these compounds produce intense colors when they are burned, which makes them ideal for fireworks.
Explanation:
According to Dalton's atomic theory
a only compounds are made of atoms.
b no two atoms of given element are exactly alike.
C atoms cannot be subdivided, created, or destroyed.
d atom is composed of another small particles.

Answers
Answer: C. Atoms cannot be subdivided, created, or destroyed. This is the correct answer
9. The pH of an acidic solution is
A) greater than 14.
B) greater than 7.
C) less than 0.
D) less than 7.
Answers
Answer: d
Explanation:
A 0.200 M NaOH solution was used to titrate a 18.25 mL HE
solution. The endpoint was reached after 31.20 mL of titrant
were added. Find the molar concentration of the original HF
solution.
Answers
Answer:
M₂ = 0.34 M
Explanation:
Given data:
Molarity of NaOH =M₁ = 0.200 M
Volume of HF =V₂= 18.25 mL
Volume of NaOH added = V₁ = 31.20 mL
Molarity of HF solution = M₂ = ?
Solution:
M₁V₁ = M₂V₂
by putting values,
0.200 M × 31.20 mL = M₂ × 18.25 mL
M₂ = 0.200 M × 31.20 mL / 18.25 mL
M₂ = 6.24 M.mL / 18.25 mL
M₂ = 0.34 M
A solution of NaCl was prepared in the following manner: 0.0842 g of NaCl is massed out on an analytical balance. The solid is transferred to a 25.00 mL volumetric flask. Deionized water is added to the flask such that the bottom of the meniscus is at the line. A 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask using a volumetric pipet and diluted to volume. 6. Calculate the concentration of NaCl in the resulting solution in mg/L NaCl. (answer = 67.4 mg/L) 7. Calculate the concentration of NaCl in the resulting solution using propagation of error through the calculation. Use the manufacturer's tolerance values as the absolute error. The tolerances can be found in Chapter 2 of the Harris text. Assume a Class 1 balance and Class A glassware. Treat the tolerances as random error. (answer = 67.4+0.4 mg/L) 8. Identify 2 possible sources of random (indeterminate) error. Identify 2 possible sourses of systematic (determinate) error.
Answers
Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl
To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7. Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.
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If you find the mass of a sample to be 42.1 g and the actual mass is 42.0 g. What wold be the percent error
Answers
Answer:
0.24%
Explanation:
The following data were obtained from the question:
Measured value = 42.1 g
Actual value = 42 g
Percentage error =?
Percentage error can be obtained by using the following formula:
Percentage error = |Measured value – Actual value | / Actual value × 100
With the above formula, we can obtain the percentage error as follow:
Measured value = 42.1 g
Actual value = 42 g
Percentage error =?
Percentage error = |42.1 – 42| / 42 × 100
Percentage error = 0.1/42 × 100
Percentage error = 10/42
Percentage error = 0.24%
Therefore, the percentage error is 0.24%
Suppose in the lcy Hot lab that the burner transfers 325 kJ of energy to 450 g of liquid water at 20. 'C. What mass of the water would be boiled away? Suppose in the lcy Hot lab that the burner transfers 325 kJ of energy to 450 g of liquid water at 20. 'C. What mass of the water would be boiled away?
Answers
Chemical properties of water and oxygen for class 8
Answers
a 0.5 mol sample of N2 is in a 6L container at 2 atm. what is the temperature of the gas in K
Answers
Answer:
300 K
General Formulas and Concepts:
Atomic Structure
Diatomic ElementsMolesGas Laws
Ideal Gas Law: PV = nRT
P is pressureV is volumen is molesR is gas constantT is temperatureExplanation:
Step 1: Define
Identify variables
[Given] n = 0.5 mol N₂
[Given] V = 6 L
[Given] P = 2 atm
[Given] R = 0.0821 L · atm · mol⁻¹ · K⁻¹
[Solve] T
Step 2: Solve for T
Substitute in variables [Ideal Gas Law]: (2 atm)(6 L) = (0.5 mol)(0.0821 L · atm · mol⁻¹ · K⁻¹)TMultiply [Cancel out units]: 12 atm · L = (0.04105 L · atm · K⁻¹)TIsolate T [Cancel out units]: 292.326 K = TRewrite: T = 292.326 KStep 3: Check
Follow sig fig rules and round. We are given 1 sig fig as our lowest.
292.326 K ≈ 300 K
What is the SI unit of length
4 points
Foot
Mile
Meter
Kilometer
Answers
Answer:
Answer is meter. ~~~~~~
why is the air along a coastline typically cooler than in other areas?
Answers
Answer:
ocean heats up and cools down relatively slowly. Therefore, areas near the ocean generally stay cooler
Based on Periodic Law, how is the Periodic Table arranged?
Answers
Answer:
Elements of the periodic table are arranged in order of increasing atomic number. the periodic law states "when elements are arranged in increasing atomic number, there is a periodic repetition of their chemical and physical properties."
Explanation:
the empirical formula for the two compounds that have very diffrent properties is ch2). if the molar mass of compound a is 60.05 g/mol and compound b is 180.16 g/mol, what are the molecular formulas for these compounds?
Answers
The molecular formula of compound A is C₂H₅., the molecular formula for compound B is C₇H₁₄.
What is empirical formula?Empirical formula is the most straightforward formula for a compound and provides the ratio of various atoms found in each compound molecule.
The empirical formula for the two compounds is CH₂. To determine the molecular formula, we need to know the molar mass of the compounds.
If the molar mass of compound A is 60.05 g/mol, and the empirical formula is CH₂, we can calculate the molecular formula by dividing the molar mass by the molar mass of the empirical formula.
60.05 g/mol / (12.01 g/mol + 2 x 1.01 g/mol) = 2.5
Therefore, the molecular formula for compound A is C₂H₅
Similarly, if the molar mass of compound B is 180.16 g/mol, and the empirical formula is CH₂, we can calculate the molecular formula by dividing the molar mass by the molar mass of the empirical formula.
180.16 g/mol / (12.01 g/mol + 2 x 1.01 g/mol) = 7.5
Therefore, the molecular formula for compound B is C₇H₁₄.
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Which molecule does not contain hydrogen bonding intermolecular attractive forces? a. CH2O b. HF c. NH3 d. CH3OH
Answers
HF and CH₃OH are molecules that does not contain hydrogen bonding intermolecular attractive forces.
Option B and D are correct.
What kind of intermolecular power is hydrogen holding?Unlike a covalent bond to a hydrogen atom, hydrogen bonding is a distinct type of dipole-dipole attraction between molecules. It results from the appealing power between a hydrogen particle covalently clung to an extremely electronegative iota like a N, O, or F molecule and another exceptionally electronegative molecule.
How many different kinds of hydrogen bonds are there between molecules?Intermolecular hydrogen bonding and intramolecular hydrogen bonding are the two main types of hydrogen bonds that have been discussed. The majority of intermolecular hydrogen bonding takes place between molecules with the same or different compounds.
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Which term describes a change that occurs with no new substances being formed?
A. Energy change
B. Bond change
C. Physical change
D. Chemical change
Answers
C. physical change
Explanation:
That's the answer
what component of hemoglobin is indicated by the red arrow?
Answers
The iron component of the heme group in hemoglobin is responsible for binding oxygen.
Hemoglobin is a protein found in red blood cells that is responsible for transporting oxygen from the lungs to the body tissues. Each hemoglobin molecule is composed of four protein subunits, each containing a heme group.
The heme group contains a porphyrin ring that binds iron at its center. The iron is responsible for binding to oxygen molecules in the lungs and releasing them in the tissues. Without the iron component of the heme group, hemoglobin would not be able to transport oxygen efficiently.
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What is required for electrons to move from the stable energy level to an excited state?
Answers
answer
When an electron temporarily occupies an energy state greater than its ground state, it is in an excited state. An electron can become excited if it is given extra energy, such as if it absorbs a photon, or packet of light, or collides with a nearby atom or particle