what are air pollutants
Answer:
things that pollute the air
Explanation:
nuclear energy, fossil fuels, gas from cars and other transportation, and these all contribute to greenhouse gases that are harmful to the environment
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what are the steps that occur during the combustion of hydrogen?
Answer:
In flame of pure hydrogen burning in air, the hydrogen (H2) reacts with oxygen (O2) to form water (H2O) with the release of energy. In atmospheric air rather than pure oxygen, hydrogen combustion may yield a small amount of nitrogen oxides with the water vapor. The energy released allows hydrogen to be used as a fuel.
Explanation:
Here are the steps that occur during the combustion of hydrogen; Initiation, Propagation, Completion, and Energy Release.
The combustion of hydrogen involves a chemical reaction with oxygen in the air, resulting in the release of energy in the form of heat and light.
Initiation: The combustion process begins by supplying energy to break the initial bonds in the reactant molecules. In the case of hydrogen combustion, heat or an external ignition source is provided to break the diatomic hydrogen molecules (H₂) into individual hydrogen atoms (H).
H₂ → 2H
Propagation: Once the hydrogen molecules are dissociated into hydrogen atoms, they react with oxygen (O₂) molecules from the air. This reaction occurs in a chain reaction mechanism involving three steps: initiation, propagation, and termination.
Initiation: Hydrogen atoms react with oxygen molecules to form hydrogen peroxide (H₂O₂) and hydroxyl radicals (OH).
H + O₂ → HO₂
H + HO₂ → H₂O₂
Propagation: The hydroxyl radical (OH) reacts with hydrogen molecules to form water vapor (H₂O) and release heat.
OH + H₂ → H₂0 + H
Termination: The chain reaction terminates when two radicals combine to form stable products.
H + OH → H₂0
Completion: The chain reaction continues as long as there is a sufficient supply of hydrogen and oxygen. The hydrogen atoms released in the propagation step can initiate further reactions with more oxygen molecules, leading to the complete combustion of hydrogen to form water vapor (H₂O).
H₂ + O₂ → H₂O
Energy Release: The combustion of hydrogen is an exothermic reaction, which means it releases energy in the form of heat and light. This energy is responsible for the heat and light produced by a burning hydrogen flame.
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Identify which of these molecules has the highest boiling point and give the reasoning why in terms of intermolecular force. CHCI3,CH3COOH, CO2
Answer:
CH3COOH
Explanation:
CH3COOH has the highest boiling point because it participates in the strongest intermolecular interactions. The -OH group can participate in hydrogen bonding with other -OH groups. Hydrogen bonds are very strong because they are the result of large partial positive charge on the hydrogen and large partial negative charge on the oxygen. When surrounded by other -OH groups, the partial positive charge on the hydrogen can form temporary bonds with the partial negative charge of an oxygen on another molecule. The stronger the intermolecular interactions, the more difficult they are to overcome, thus increasing the boiling point.
The strongest IMF the other molecules participate in are dipole-dipole. These interactions are not as strong as hydrogen bonding.
An unidentified flying object has crashed in your yard! An alien emerges from the wreckage. The alien tells you that it has traveled here from the planet Geela which is 5.670x10^3 light years away. How many miles away is Geela? 1.06 x 10^-16 light years = 6.21 x 10^-4 miles
Answer : Geela away is [tex]33.22\times 10^{15}\text{ miles}[/tex]
Explanation :
As we are given that the alien tells you that it has traveled here from the planet Geela which is 5.670 × 10³ light years away.
And we know that:
[tex]1.06\times 10^{-16}\text{ light years}=6.21\times 10^{-4}\text{ miles}[/tex]
Now we have to determine the distance away is Geela.
As, [tex]1.06\times 10^{-16}\text{ light years}=6.21\times 10^{-4}\text{ miles}[/tex]
So, [tex]5.670\times 10^{3}\text{ light years}=\frac{5.670\times 10^{3}\text{ light years}}{1.06\times 10^{-16}\text{ light years}}\times 6.21\times 10^{-4}\text{ miles}[/tex]
= [tex]33.22\times 10^{15}\text{ miles}[/tex]
Therefore, the Geela away is [tex]33.22\times 10^{15}\text{ miles}[/tex]
if you change the _ you change the identity of the atom
Answer:
protons
Explanation:
remember that the number of protons in the nucleus determines the protons identity
Answer:
Number of protons
Explanation:
The number of protons is unique to each element's identity and corresponds with the atomic number.
K electron configuration
Answer:
Question stealer :]]
Explanation:
500 cm3 of a solution has a concentration of 1. 5mol/dm3 how many moles are in the solution?
Answer:
There is 0.75moles in the solution
Answer:
Explanation:
concentration=no.of moles/volume in dm3
which is
1.5mol/dm3 multiply by 500/1000
=0.75moles
1. particles of an atom.
2. what is a neutron
Answer:
1. The three parts of an atom are:
ProtonsNeutronsElectrons2. A neutron is a particle of an atom with a neutral charge.
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Three years after the first Moon landing, which two countries linked up spacecrafts to famously shake hands?
A. China and Russia
B. the United States and the Soviet Union
C. China and the United States
D. Russia and the Soviet Union
Answer: B. the United States and the Soviet Union
Explanation:
What is the acceleration between 20 to 30 seconds?
Answer:
It would start at 0 and keep graduatly growing bigger and bigger numbers
Explanation:
6. What type of relationship is shown in the image below?
1 point
500
400
300
Mass, 9
200
100
0
0
200
400
600
800
1000
Volume, ml
Direct
Exponential
O Indirect
Inverse
Answer:
A direct relationship
Explanation:
The graph shows a direct relationship due to the fact that the line is going up in a positive correlation/increasing as the amount of mass and volume increase.
Find the distance that a car traveled that went 50 miles per hour in 3 hours.
The car travels 50 miles per hour. To find the distance it travelled in 3 hours, multiple 50 by 3.
50 x 3 = 150
Therefore, the car would travel 150 miles in 3 hours.
This formula equation is unbalanced.
P4(s) + Cl2(g) Right arrow. PCl3(l)
Which coefficient should be placed in front of PCl3 to balance this equation?
1
2
4
6
Answer:
4
Explanation:
Answer to balance the equation
P4 + 6Cl2 => 4PCl3
Answer:
C
Explanation:
5. A flame test can be used to identify an unknown element. A student reacts two chemicals and decides to perform a flame test on the resulting product. If the product gives off a magenta hue when in flames, which element is likely to be present? Use your lab data to help determine the identity of this element.
Answer:
The element that is likely to be present is LITHIUM.
Explanation: ABOUT FLAME TEST
An analytical chemistry method used to help identify metal ions is the flame test. It can not be used to classify all metals, although it is a useful qualitative research test and a lot of fun to perform, since not all metal ions emit flame colors. Some metal ions also display colors similar to each other, making it difficult to tell them apart. However, for the detection of various metals and metalloids, the test is still useful.
One downside of the flame test is that the light color that is detected depends very much on the flame's chemical composition (the fuel that is being burned). This makes it difficult to match colors with a chart that has a high level of trust.
The bead test or blister test, in which a bead of salt is coated with the sample and then heated with a Bunsen burner flame, is an alternative to the flame test. Because more samples stick to the bead than to a simple wire loop, this test is slightly more accurate and Since most Bunsen burners, which appear to burn with a clean, blue flame, are linked to natural gas.
ABOUT LITHIUM ELELMENT -:It's metal, but it's soft enough to cut with a knife .It is so light that water can float on it. It is hard to put out lithium fires. Lithium, along with hydrogen and helium, was one of the three elements that the Big Bang produced in vast amounts.
Hence , we identifies the element in flame test by the color produces that is magenta or pink-red which gives the element Lithium . Therefore , the correct answer is lithium.
The atomic mass unit is equivalent to 1 of the mass of a neutral atom of which element? (1 point)
O carbon
o hydrogen
O gold
O oxygen
The atomic mass unit is equivalent to 1 of the mass of a neutral atom of carbon.
What is Atomic Mass Unit?It is defined as one out of twelve parts of the mass of the neutral atom of the most abundant isotope of carbon, that is, carbon 12.
By this definition, it is obvious that the atomic mass unit of elements is measured with respect to the mass of a neutral atom of carbon 12 - not hydrogen, gold, or oxygen.
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Water is called the ____ ______
Water is called the universal solvent
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force acts on it.
Newton's first law of motion states that an object remains at rest unless a
a. balanced
c. gravitational
b. frictional
d. net
Answer:D.
Explanation:
A student has a sample of aluminum that has a mass of 27 g and a volume of 10cm3. What is the density of aluminum
Answer:
270 g/cm^3
Explanation:
d = mv
d = 27 g × 10cm^3
d = 270 g/cm^3
What is the mass number of a cobalt atom that has 27 protons and
30 neutrons?
Answer:
all u need to do is this 27 + 30 = 57.
Explanation:
In any chemical change, matter changes into an entirely
different substance with different chemical properties.
True or false
Answer:
True
Explanation:
What are the 4 properties of the atom?
Answer:
Typical sizes of atom and nucleus.
Most of atom's mass is in the nucleus.
Constituents: protons, neutrons, electrons.
Electric force holds atom together.
Explanation:
Classify the following materials as solid, liquid, or gas at room temperature: milk, helium , granite , oxygen , steel , and gasoline
Answer:
milk liquid
helium gas
granite solid
oxygen gas
steel solid
gasoline liquid
Answer: Milk is liquid. Helium is gas. Granite is solid. Oxygen is gas. Steel is solid. Gasoline is liquid.
Explanation:
Which of the following statements is true?
A. Magnesium (Mg) is brittle.
B. Iodine (I) is magnetic.
C. Copper (Cu) conducts heat.
D. Iron (Fe) has a low density.
Answer:
I think it's C.copper conducts heat
The elements of the periodic table are arranged in the families and periods based on their properties. Copper (Cu) is a transition metal that can conduct electricity. Thus, option C is correct.
What are transition metals?Transition metals are the metallic elements that are arranged in groups 3 - 12 and periods 4-7. They are also called d-block elements due to the electron present in the d orbit of the atom making them capable of bond formation.
They all show the properties of metals that include shininess, luster, conductivity, etc. The series include copper, iron, cobalt, gold, zinc, chromium, nickel, manganese, molybdenum, etc.
Copper being a transition metal has the property of conducting electricity and is used in wirings as they have loosely bounded electrons in their shell that can carry the electrical charge in a circuit.
Therefore, option C. copper (Cu) can conduct electricity and heat is correct.
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Which of the following could be the chemical formula for a compound?
Group of answer choices
C + O2
Si
H2O
Zn
Answer:
H20
Explanation:
This table shows the mass and volume of four different objects.
Which ranks the objects from most to least dense?
X, Y, W, Z
X, Z, Y, W
W, Y, Z, X
Z, Y, X, W
Answer:
second one/ B
Explanation:
just took the quiz
Answer:b
Explanation:
A force of 20 N is applied to a cart with a mass of 3 kg. What is the acceleration of the cart?
Answer:
The answer is 6.67 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
where
f is the force
m is the mass
From the question we have
[tex]a = \frac{20}{3} \\ = 6.6666666...[/tex]
We have the final answer as
6.67 m/s²Hope this helps you
Janet learns that Earth is tilted. Due to its tilt, some areas on the surface of Earth experience darkness for an entire day. Which plant process is affected most during this darkness?
root growth
root growth
reproduction
reproduction
photosynthesis
photosynthesis
water absorption
water absorption
Photosynthesis is that plant process is affected most during this darkness because photosynthesis only occurs when there is sunlight.
What is photosynthesis?Photosynthesis is a process in which water and carbondioxide combine in the presence of sunlight and produce glucose and oxygen. We know that Photosynthesis occurs only at daytime.
So we can conclude that Photosynthesis is affected during this darkness because photosynthesis only occurs when there is sunlight.
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True or false for the following questions?
Answer:
T
F
T
Explanation:
hope it helps! sorry for no explanation
The molecular weight of water, H2O is 18.02 g/mol. How many moles of water are in 24.3 g of water?
Answer:
1.35moles
Explanation:
mm=18.02gmol⁻¹ mass=24.3g
mole=mass/mm
mole=24.3/18.02
mole=1.35moles
Answer:
The answer is 1.35 molesExplanation:
To find the number of moles given the molecular weight and mass we use the formula
[tex]n = \frac{M}{m} \\ [/tex]
where
n is the number of moles
M is the molar mass
m is the mass of the substance
From the question
m = 24.3 g
M = 18.02 g/mol
We have
[tex]n = \frac{24.3}{18.02} \\ = 1.348501664...[/tex]
We have the final answer as
1.35 molesHope this helps you
how you steal a bus?
Answer:
break into it hotwire it and drive duhh
Explanation: