Answer:
2.1×6.02×1023÷ 14
9.03×1022 atom of nitrogen
Explanation:
Help me describe air pollution and its causes.
Here is a Answer to your question:
Air pollution is caused by solid and liquid particles and certain gases that are suspended in the air. These particles and gases can come from car and truck exhaust, factories, dust, pollen, mold spores, volcanoes and wildfires. The solid and liquid particles suspended in our air are called aerosols.
Here are the 8 causes of air pollution?
1: The Burning of Fossil Fuels
2: Industrial Emission
3: Indoor Air Pollution
4: Wildfires
5: Microbial Decaying Process
6: Transportation
7: Open Burning of Garbage Waste
8: Construction and Demolition
I am sorry if this was not helpful
Hope this was helpful
Fe2O3 (s) +3CO (g) ----> 2Fe (l) + 3CO2 (g)
How many moles of Fe2O3 must react to produce 262 mol of Fe?
At 101.3kPa and 298 K. What is the total amount of heat released Open one mole of aluminum oxide is formed from its elements
Answer:
The answer is (3) 1676 kJ. The heats of reaction at 101.3 kPa and 298 K for reaction: 4Al(s) +3O2(g)= 2Al2O3(s) is -3351 kJ. So for one mole of aluminum oxide is 3351/2=1676 kJ.
A gas sample has a temperature of 19 °C with an unknown volume. The
same gas has a volume of 464 mL when the temperature is 90. °C, with no
change in the pressure or amount of gas.
Answer: 373 mL
Explanation:
Since there is no change in pressure, the formula: V / T = V / T can be used.
However, you must first convert the temperatures to Kelvin by adding 273 to them:
(19 + 273) = 292K and (90 + 273) = 363K.
Now, plug in: V / 292 = 464 / 363 → V = 373 mL :)
Lithium nitride has a high melting point, 813*C. Nitrogen trifluoride has a low malting point, -207*C.
Explain why the melting points are different? [2 marks]
.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Answer:
Lithium has high melting and boiling point due to its small size, due to which it possesses high ionisation energy. As a result the binding energy in its crystal lattice is very high. This is why lithium has high melting and boiling point.
Explanation:
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1. What happens when an environment reaches its carrying capacity?
A. The population will decrease B. The population will increase
C. The resources will be unlimited
D. Nothing will happen.
Answer: b. population will decrease
Explanation:
since earth only has a finite amount of resources, it could only support a set amount of people. once these sources can no longer be used, the population will decrease because resources can no longer support the population.
how many moles are needed to make 2.5 L of a 3.8 M solution?
Answer:
9.5
Explanation:
that the answer I hope am correct
Isotopes are:
A. found in the nuclear reactions in
stars but not on Earth.
B. are only theoretical.
C. found in nature.
D. only formed in laboratories.
Isotopes are only formed in laboratories and is denoted as option D.
What are Isotopes?This refers to an element which has the same atomic number but different mass number due to difference in number of neutrons.
They are also usually formed in laboratories through series of chemical reactions.
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Briefly explain the two ways Avogadro's number was calculated.
The value of Avogadro's number was obtained by dividing the charge of a mole of electrons by the charge of a single electron which is equal to 6.02214154 x 1023 particles per mole.
The most common used way is
n=Charge of one mole of atom /charge of one single atomThere can be another derived way
No of molecules=No of moles ×Avagadro noAvagadro no=No of molecules/No of molesHello people ~
Which of the following cannot be used to extinguish the fire caused by electricity?
A. Carbon dioxide
B. Blanket
C. Sand
D. Water
D. Water
carbon dioxide reduces the oxygen concentration in the surrounding, thus no combustion can taken place.Blanket cuts the oxygen supply from the surroundings.Sand stops the oxygen from reaching the fire for a few moment.Water gives the fire a wide spread across the burning surface.If the density of lead is 11.34g/.what is the density in kg/l
Answer:
0.01134kg
Explanation:
You divide by 1000 to get the kg
This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment. this part contains a known amount of water, which is placed there before the experiment starts. this part is where the metal is placed at the beginning of the experiment. this part is used for measuring the initial and final temperatures of the water.
The amount of heat transferred in and out of the system is measured by calorimetry. The thermometer in the calorimeter is used to measure the temperature.
What are the parts of the calorimetry device?The thermometer (A) is a device used to measure the final and the initial temperature of the water or any other liquid in a system. A metal vessel is a place where the reaction mixture is present.
In-vessel (B), water, and metal are placed before the beginning of the experiment. The styrofoam cup or the outer metal vessel (C) insulates the instrument, from regulating the heat transformation.
Therefore, part A measures the temperature of the reaction mixture.
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which acid would produce the salt zn(no3)2
Answer:
Explanation:
Nitric Acid (HN03)
Zn(OH)2 + 2HNO3 ==> Zn(NO3)2 + 2HOH
Which statement best describes a society’s desire for fuel-efficient vehicles? Choose the correct answer.
Auto manufacturers set fuel-efficiency standards.
Interest in fuel efficiency decreases when fuel prices are low.
Fuel shortages in the 1980s started the interest in fuel efficiency.
An increase in fuel efficiency increases carbon dioxide emissions.
Fuel shortages in the 1980s started the interest in fuel efficiency best describes a society’s desire for fuel-efficient vehicles because of Iran- Iraq war.
Why Fuel shortages in the 1980s started?The Iran-Iraq War in 1980 is the main cause of shortage of oil production. Iraq's and Iran's oil production dropped significantly which triggering economic recessions worldwide.
So that's why society’s desire for fuel-efficient vehicles in order to reduce consumption as well as reduce pollution.
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A 100g block of pine wood has a volume of 300 cm3. Would this block float on water (density of water is 1.0 g/cm3)?
A 120g block of pinewood has a volume of 300cm3. Would this block float on water? (HINT: Water has a density of 1g/cm3). a. No, because the block is denser than water.
Also here's a free meme
The density of a material represents the denseness of that material in a specific given area. If an object has a density less than water then it will float on water otherwise it will sink. Here the wood will float on water.
What is density?The density of a material denotes the measurement which compares the amount of matter an object has to its volume. An object with more matter in a certain volume has a high density. It is defined as the mass per unit volume.
The density is usually represented by symbol ρ or by the letter D. The formula used to calculate the density is:
Density = Mass / Volume
D = 100 / 300 = 0.33 g/cm³
Here the density of water is 1.0 g/cm³ which is greater than the density of pine wood. So the pine wood will float on water.
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Using the simulation, how can you show that it takes more energy to convert a liquid to a gas than a solid to a liquid?
Answer:
The enthalpy of vaporization of a given substance is much greater than its enthalpy of fusion because it takes more energy to completely separate molecules (c
In the electroplating of nickel, 0. 200 faraday of electrical charge is passed through a solution of niso4. What mass of nickel is deposited?.
The mass of nickel, Ni deposited when 0.2 faraday of electrical charge is passed through a solution of NiSO₄ is 5.9 g
Balanced equationNi²⁺ + 2e —> Ni
Molar mass of Ni = 59 g/mol
Mass of Ni from the balanced equation = 1 × 59 = 59 g
Number of faraday = 2
SUMMARY
From the balanced equation above,
2 faraday deposited 59 g of Nickel
How to determine the mass of nickel depositedFrom the balanced equation above,
2 faraday deposited 59 g of Nickel
Therefore,
0.2 faraday will deposit = (0.2 × 59) / 2 = 5.9 g of Nickel
Thus, 5.9 g of Nickel were deposited in the process
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Answer:
5.9 grams
Explanation:
You need 2 faraday to deposit 1 mole of Ni (59 grams) because there are 2 moles of electrons in equation:
Ni+2 + 2e- --> Ni(s)
So, 0.2 faraday will deposit 1/10 of that or 5.9 grams of Ni(s).
Young fronds are called____
because of how they are coiled
Answer:
Fiddlehead
Explanation:
Young fronds are called Fiddleheads
because of how they are coiled
Answer:
Fiddleheads or koru
Explanation:
The coiled, immature leaves are called fiddleheads. Young fronds, called fiddleheads because of their striking resemblance to the head of a violin, start out tightly curled at the base of the root. New, or young fronds are produced from the rhizome. They are tightly coiled into a spiral (called a fiddlehead or koru), and these slowly uncoil as they mature.
i don’t really know how to do this and need help
Answer:
3,550,000
Explanation:
3 significant figures is a number which has 3 figures
and zeros ( zero is not a figure )
Answer:
3550,000
Explanation:
Rounding rule:
If > 5 enter one
If < 5 rounding
Note:
< = less than
> = greater than.
Solve:
Base on the given:
it < 5 rounding
Thus,
3545,530 ≈ 3550,000
~Lenvy~
"Review of the Basics" - WS #1
Directions: Please answer each fill in the blank with the best answer. »
1.
are atoms or groups of atoms that have a positive or negative charge.
2. A
is any atom or group of atoms with a positive charge
Answer: 1. Ions
2. Cation
Explanation:
No explanation; this is basic vocabulary. :)
Given the gas conversion factor 1 MOL= 22. 4 L , why couldn’t we just convert 38. 0 L to moles to get the answer for the last problem?
To calculate the molar volume of a gas at STP you can use the ideal gas law equation,
PV=nRT
Regardless of what ideal gas you use, the molar volume at STP will be identical across the board, since you'll be using 1 mole in the ideal gas law equation regardless of what gas you're dealing with.
That is why the volume occupied by 1 mole of any ideal gas will be equal to 22.7 L at STP.
22.4L = 1 mol
38.0L = ?
= 38/22.4
=1.6964285714 Moles
Malic acid, h2c4h4o5, is a diprotic acid with ka1 = 4. 0 × 10–4 and ka2 = 6. 3 × 10–6. Calculate the ph of a 0. 50 m solution of malic acid
The pH of a 0.50M solution of malic acid with ka1 = 4. 0 × 10-⁴ and ka2 = 6. 3 × 10-⁶ as described is; 1.85.
pH of Diprotic acids: Malic AcidSince, in a polyprotic acid the first hydrogen will dissociate faster than the others, If the Ka values differ by a factor of 10-³ or more, it is possible to approximately calculate the pH by using only the Ka of the first hydrogen ion.
However, the situation is different in this scenario.
On this note, the solution is as in the attached image.
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The pH of a 0.50 m solution of malic acid is 1.85.
What is pH?pH is potential hydrogen. It is the measurement of the acidity and basicity of any solution.
The ka1 = 4. 0 × 10⁻⁴
The ka2 = 6. 3 × 10⁻⁶
The solution is 0.50 m.
First calculate the ka value
[tex]ka = \dfrac{x^2}{0.50} \\\\x^2 = 0.50 \times 4 \times 10^-^4\\\\x^2 = 2 \times 10^-^4\\x^2 = \sqrt{2 \times 10^-^4} \\\\ x = [H^+] = 1.41 \times 10^-^2[/tex]
Now, calculate the pH
[tex]pH = -log [H^+]\\\\pH = -log[ 1.41 \times 10^-2]\\\\pH = 1.85[/tex]
Thus, the pH of a 0.50 m solution of malic acid is 1.85.
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Which mineral reacts readily with cool, dilute hydrochloric acid to produce visible bubbles of carbon dioxide gas?.
Answer:
The acid reacts with the mineral to release CO2 gas that is bound into the crystal as carbonate ion.
Explanation: i got it corrcet
Question 6 of 10
Which of these accurately describes a difference between nuclear energy and
fossil fuel?
O A. In nuclear fuel reactions, heat is released that is used to do work.
O B. Nuclear fuel has a higher energy density than fossil fuels.
O C. Fossil fuels have a higher energy density than nuclear fuel.
O D. In fossil fuel reactions, heat is released that is used to do work.
Answer:
b. nuclear fuel has a higher energy density than fossil fuels.
Explanation:
Nuclear fuel is a quantity of energy measured in joules; therefore, it has the same units as electrical and mechanical energy.
Animals burrow into soil is this mechanical weathering or chemical weathering
Answer:
Animals also contribute to mechanical weathering. Digging animals such as moles break apart rocks underground, while the movement of animals on surface rock can scratch the rock's surface or exert pressure that causes the rock to crack.
Explanation:
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How to tell if a reaction is double bond or single
Answer:
Single replacement is a reaction in which one element reacts with another compund to form another compound and another element.
planation:
If the reaction is double displacement then two molecules will be displaced and if it is single displacement reaction then only one element displaces.
What is displacement reaction?Displacement reactions are those reactions in which any element of the given reactant will be displaced by any another element.
If only one element from the reactant molecules will displace then it will be known as single displacement reaction. If two elements or atoms will be displaced from the reactant molecules then it will be known as double displacement reaction.
Hence if one element displaceed then called the single displacement reaction and if two elements displaces then called as the double displacement reaction.
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100 pOiNtS
Explain why the vapor pressure of a solution differs from that of the pure solvent
Explain why the freezing point of a solution differs from that of the pure solvent
Explain why the boiling point of a solution differs from that of the pure solvent
Answer:
Answer one:
Solute particles block some of the ability of liquid particles to evaporate. We can then conclude, solutions of solid solutes typically have a lower vapor pressure than pure solvents.
Answer two:
Solutions freezing points are lower than of the pure solvent or solute because freezing (becoming a solid) creates order and decreases entropy.
Answer three:
The presence of solute particles decreases the vapor pressure of the liquid solvent, this means a higher temperature is needed to reach the boiling point.
Explanation:
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What change would occur in the mass between the reactants (lead nitrate and potassium iodide) and the products (lead iodide and potassium nitrate)?
Please help me this is coming in my exam. Thank you
Answer:
Pb(NO
3
)
2
+
2
KI
→
PbI
2
+
2
KNO
3
Explanation:
7.
Which substance, if added to a saturated solution of
NH4OH, would cause the pH of the solution to increase?
A. HCI
B. NH4C1
C. LiOH
D. CH3OH
Answer:
C LiOH
Explanation:
because it is an hydroxide as well as it is alkaline
Answer:
C. LiOH
Explanation:
LiOH is a strong base while the others are acids
In what container can you not see the meniscus
Answer:
Measure so that the line you are reading is even with the center of the meniscus. For water and most liquids, this is the bottom of the meniscus. For mercury, take the measurement from the top of the meniscus. In either case, you are measuring based on the center of the meniscus.
Explanation: