Answer: Environmental chemistry
Explanation:
Identify the solutions among the following mixtures
Soil, Sea water, Air, Coal, Soda water
Answer:
Out of the above mixtures, seawater, air, and soda water are solutions.
hope this helps :3
Common Tasks for Chemists.
Answer:
analysis organic and inorganic compounds,refine substances and chemicals products
A new band sensation is playing a concert and recording it for a live album to be released this summer. select all the statements that are true for band producing sound.
a) the frequency or amplitude of the sound waves will not change
b) the frequency or amplitude of the sound waves will change if the singer varies their voice
c)producing sound changes the wane from an electromagnetic wave to a mechanical wave
d)the produced sound waves are mechanical waves
e)the produced sound waves are electromagnetic waves
f) producing the sound does not change the wave type
g) producing sound changes the wave from mechanical wave to an electromagnetic wave
They travel in compressions and rarefactions and are propagated through air.
What are sound waves?Sound waves are longitudinal waves. They travel in compressions and rarefactions and are propagated through air.
The following are true about sound waves:
the frequency or amplitude of the sound waves will change if the singer varies their voice.the produced sound waves are mechanical waves. producing the sound does not change the wave typeLearn more about sound waves:https://brainly.com/question/11797560
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What is the name of the configuration management procedure that involves the collection of information about a system under normal operating conditions, to be used as a comparison when conditions are abnormal
The name of the configuration management procedure that involves the collection of information about a system under normal operating conditions is Baselining.
What is Baselining?Baselining is a management process used to analyze a collection of information about a particular system.
This procedure (Baselining) is well known to analyze computer performance in a given network.
In conclusion, the name of the configuration management procedure that involves the collection of information about a system under normal operating conditions is Baselining.
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Select all statements that correctly describe the stability of eclipsed and staggered conformers. Multiple select question. Staggered conformers possess torsional strain. Eclipsed conformers possess torsional strain. Staggered conformers are lower in energy than eclipsed conformers. Electron-electron repulsion between bonds in an eclipsed conformer may contribute to the low energy of this conform
Eclipsed conformers possess torsional strain and Staggered conformers are lower in energy than eclipsed conformers are TRUE about the stability of conformers.
What does 'eclipsed conformers' mean?Eclipsed conformers are molecular arrangements where two substituents are very close and thus produce torsion.
Moreover, Staggered conformers are molecular arrangements where substituents are found at a maximum length.
In conclusion, Eclipsed conformers possess torsional strain and Staggered conformers are lower in energy than eclipsed conformers are TRUE about the stability of conformers.
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Why can alkaline batteries not be recharged
Answer:
The biggest risk with recharging alkaline batteries is leakage. As you probably know, alkaline batteries leak even under normal circumstances. Internal off gassing, made worse by heat, creates pressure that can breach battery seals. Therefore, the risk of leakage is an even bigger risk when recharging.
Ahmed doesn't believe in electromagnetism so he makes an electromagnet to prove his teacher wrong. To his surprise, the electromagnet works and he's able to pick up metal objects with it. Even still, he's not satisfied with his electromagnet because it's very weak. What can he do to make it stronger?
Answers: use a weaker battery
1. use a stronger battery
2. use a plastic nail
3. glue the wire to the nail
4. wrap the wire around the nail fewer times
Answer:
1) Use a stronger battery
Explanation:
I'm going to quote Northeastern University (I could try to type out an explanation but this will probably be more concise)
"Electromagnets are made of coils of wire with electricity passing through them. Moving charges create magnetic fields, so when the coils of wire in an electromagnet have an electric current passing through them, the coils behave like a magnet."
4) So, if the coils are creating a moving charge, and there are more coils, each coil will be "setting up" its own magnetic field. This means that less coils will make the electromagnet weaker
2) Because it is an electromagnet, a plastic nail is not going to produce the same effect. An electromagnet is picking up metal, and it is not picking up plastic. This is because plastic (a material with low permeability) does not have a magnetic field that is able to interact with a magnet.
[Permeability is a measure of how easily magnetic lines of force can pass through a material.]
3) There's not really a point that I can imagine of gluing the wire to the nail. Glue would put more distance between the nail and the magnet than nothing being there at all.
1) More voltage in a battery produces a larger current in the wire. This means that the strength of an electromagnet is affected by the voltage/strength of the battery. So, a stronger battery would make the electromagnet stronger, and a weaker battery would make the electromagnet weaker.
The electromagnet works, and he's able to pick up metal objects with it, he does to make it stronger to use a stronger battery. Therefore, option 1 is correct.
What is electromagnet ?An electromagnet is a type of magnet where an electric current creates the magnetic field. The wire that makes up an electromagnet is typically twisted into a coil. A magnetic field is produced by a current flowing through the wire and is concentrated in the hole in the center of the coil.
Electrical devices including motors, generators, speakers, computers, and MRI machines cannot be built without electromagnets. They are well known for their ability to lift and move heavy magnetic objects, such as scrap iron.
Many electromagnets have an advantage over permanent magnets because they can be easily turned on and off, and increasing or decreasing the amount of electricity flowing around the core can control their strength.
Thus, option 1 is correct.
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Which of the following materials fall in the category of a ‘‘pure substance’’?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, brick, wood, Air
Answer:
1) Ice, iron, calcium oxide and mercury are pure substances since they contain particles of only one kind of matter.
2) In contrast, milk, hydrochloric acid (hydrogen chloride gas dissolved in water), brick and air cannot be called pure substances because they consists of particles of more than one kind of matter.
pls help me with this chem question
Answer:
B
Explanation:
i just know
Answer:
B
Explanation:
Hydrocarbons are with hydrogen and carbon only, so therefore you can immediately eliminate C and D. Therefore, we are left with A and B. Unsaturated hydrocarbons have double bonds or more, so B would be our answer (Double bond between carbon 1 and 2)
Determine the unknown mineral using the information given below. Be sure to use significant figure rules when doing calculations. Mass is shown on the triple beam. Scale Test Mineral Mineral H. Density, g/cc 10 diamond tellurium 2 2.07 9 corundum galena 2.5 7.58 8 topaz anglesite 2.5 - 3 6.4 7 quartz chalcocite 2.5 - 3 5.6 6 feldspar copper 2.5 - 3 9.0 5 apatite gold 2.5 - 3 19.3 4 fluorite silver 2.5 - 3 10.5 3 calcite arsenic 3.5 5.7 2 gypsum barite 3 - 3.5 4.4 1 talc dolomite 3.5 - 4 2.9 platinum 4.5 21.5 willemite 5.5 4.0 magnetite 6 5.18 pyrite 6 - 6.5 5.02 pyrolusite 6 - 6.5 5.0 cassiterite 6.5 6.9 diamond 10 3.52 Volume of water displaced = 0.051 L
Mass: 981.0, 908, 908.1, 981 g
Density: 192.35, 19,235, 19, 19.2 g/cc
Hardness 4, 2.5, 1, 3, 5.5 - 5, 3, 2, 4.5, 1.5
Determine the unknown mineral.
Platinum, Gold
The unknown mineral is gold because of the similar properties of gold to that unknown mineral.
What is unknown mineral?The unknown mineral is Gold because it has similar properties to the gold. Gold has density of 19.3 grams per cubic centimeter which is same to this unknown mineral. The hardness and mass of the mineral are also similar to the Gold.
So we can conclude that the unknown mineral is gold because of the similar properties of gold to that unknown mineral.
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How many atoms are in 3.2 moles of N2
Answer:
38.54 x 10^23 atoms of N2
Explanation:
Each mole contains Avagadro's Number ( 6.022 x10^23) of particles
3.2 x 6.022 x 10^23 = 19.27 x 10^23 MOLECULES
N2 is TWO atoms soooo 2 x 19.27 x 10^23 = 38.54 x 10^23 atoms
Calculate the volume of hydrogen chloride gas, HCl at s.t.p that would yield 1.2dm3 of 0.15mol/dm3 aqueous HCl solution. (Molar volume of a gas at s.t.p = 22.4dm3)
The volume of hydrogen chloride gas, HCl at s.t.p yielded is determined as 4.032 dm³.
Number of moles of the HCl gas yieldThe number of moles of the gas yield is calculated as follows;
n = 1.2 dm³ x 0.15 mol/dm³
n = 0.18 mole
one mole of HCl gas at stp = 22.4 dm³
0.18 mole = ?
= 0.18 x 22.4 dm³
= 4.032 dm³
Thus, the volume of hydrogen chloride gas, HCl at s.t.p yielded is determined as 4.032 dm³.
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Which law of thermodynamics relates most directly to the Law of Conservation of Energy?
Answer:
First Law of Thermodynamics
Explanation:
The first law of thermodynamics is literally another name for the law of conservation of energy.
PLEASE I REALLY NEED HELP!!! ITS NOT MULTIPLE CHOICE BTW :'(
A 76.0-gram piece of metal at 96.0 °C is placed in 120.0 g of water in a calorimeter at 24.5 °C. The final temperature in the calorimeter is 31.0 °C. Determine the specific heat of the metal. Show your work by listing various steps and explain how the law of conservation of energy applies to this situation.
Answer:
660J/kg.°C
Explanation:
Using the fact that
∆E of metal + ∆E of water = 0
∆E of the metal = Q = m*c*(T2-T1)
Where
Q = heat lost or gained = ?
m = mass of metal in kg = 0.076kg
c = specific heat of the metal = ?
T1 = 96°C
T2=31°C
∆E of the water=Q= m*c*(T2-T1)
Where
Q = 0.120*4180*6.5 = 3260J
Therefore
3,260J + Q of the metal =0
3,260J + 0.076*C*(31.0–96.0)=0
3,260J - 4.94c = 0
3,260 = 4.94c
3,260/4.94 = c
660J/kg.°C = specific heat of the metal
hope this helps:)
Classify the following as mixtures or pure substances. (a) the vegetable soup you had for lunch (b) the fertilizer your dad spreads on the front lawn in the spring (c) the salt you sprinkle on your French fries (d) the hydrogen peroxide you cleaned a cut finger with
(a) The vegetable soup you had for lunch: mixtures substances
(b) The fertilizer your dad spreads on the front lawn in the spring: mixtures substances
(c) the salt you sprinkle on your French fries: pure substances
(d) the hydrogen peroxide you cleaned a cut finger with: pure substances
What are mixtures?
In chemistry and related fields, a mixture refers to a substance that is composed of two or more substances. This is the opposite of a pure substance that has not been combined with others. In the case of vegetable soup, this is a mixture because it integrates multiple substances such as water, salt, vegetables, etc.
On the other hand, a mixture is classified as homogeneous if the elements are completely integrated, and the final substance is uniform or as heterogeneous if the mixture is not uniform. In the case of the soup, this can be classified as a heterogeneous mixture because in most cases you can identify the elements in it such as pieces of vegetables and therefore it is not a uniform or homogeneous mixture.
Thus, this could be the answer.
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If you run this reaction with 15 g of CuCl2 and 20 g NaNO3, what is the theoretical yield of NaCl?
The theoretical yield of a substance is the amount of the mass that is calculated from stoichiometry. The mass of sodium chloride produced is 13.03 gms.
What is mass?
Mass of the substance is a multiplication of the molar mass and moles.
The balanced reaction is given as:
CuCl₂ + 2NaNO₃ ⇒ 2NaCl + Cu(NO₃)₂
Moles of copper chloride are calculated as: 15 ÷ 134.45 = 0.115 moles
Moles of sodium nitrate are calculated as: 20 ÷ 84.99 = 0.2353 moles
From the reaction, 1 mole of copper chloride gives 2 moles of sodium chloride so, 0.115 moles of copper chloride will produce 0.223 moles.
Similarly, 2 moles of sodium nitrate produce 2 moles of sodium chloride so, 0.2353 moles produce 0.4706 moles.
From this, it can be concluded that copper chloride is a limiting reagent and will be used to calculate the mass of NaCl.
Mass of NaCl is calculated as: Mass = 0.223 moles × 58.44 = 13.03 gms.
Therefore, 13.03 gms is the theoretical yield of sodium chloride.
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how many moles of oxygen from the are needed to consume 2.49 mol c55h104o6
The conductance of the electric current through the electrolytic solution increases with
a)decrease in dilution
b)increase in dilution
c)increase in concentration
d)low degree of ionization
The conductance of the electric current through the electrolytic solution increases with increase in concentration.
What is electrolytic solution?
Electrolytic solutions are solutions that are capable of conducting an electric current due to presence of ions.
The current flowing in an Electrolytic solutions is calculated as;
Q = It
I = Q/t
where;
Q is chargesIncrease in the concentration of the charges, increases the amount of charges in the solution and hence the conductance of the solutions will increase as well.
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Ammonia is produced by reacting hydrogen and nitrogen gases. If 30.0L of hydrogen is mixed with 12.0L of nitrogen at the same temperature and pressure, what is the maximum volume of ammonia gas that could be produced?
[tex](2.4L)NH_3[/tex] is the maximum volume of ammonia gas that could be produced.
What is a mole?A mole is a very important unit of measurement that chemists use. A mole of something means you have 602,214,076,000,000,000,000,000 of that thing, like how having a dozen eggs means you have twelve eggs.
Here is the balanced equation:
[tex]N_2 +3H_2[/tex] → [tex]2NH_3[/tex]
At STP, 1 mole has a volume of 22.4 Liters. To do a dimensional analysis conversion from Liters to moles:
Please observe that Liters and moles vary directly, therefore, we can simply multiply each of the coefficients (that represent moles) by
1.2 L to obtain the volumes:
[tex]\frac{N Litres}{1} \frac{1}{22.4 Litres} =\frac{N }{22.4} mole[/tex]
[tex](1.2L)N_2+(3.6L)H_2 = (2.4L)NH_3[/tex]
Hence, [tex](2.4L)NH_3[/tex] is the maximum volume of ammonia gas that could be produced.
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Please help me answer this
Answer:
1.01
Explanation:
you have to trust me
when 2 moles of C6H6 react with excess Oxygen gas, how many moles of water are produced?
C6H6 + 9 O2 ------> 6CO2 + 6 H20
Answer:
12 moles H₂O
Explanation:
To find the amount of water produced, you need to use the given amount and multiply it by the mole-to-mole ratio from the equation. These numbers are the coefficients of the molecules you are converting from and to. When writing the ratio, make sure to arrange it in a way that allows for the cancellation of units.
1 C₆H₆ + 9 O₂ ----> 6 CO₂ + 6 H₂O
2 moles C₆H₆ 6 moles H₂O
--------------------- x ------------------------- = 12 moles H₂O
1 mole C₆H₆
The diagram below shows three kettles with their powers and the time they take to boil 500cm3 of water. How much energy is transferred (in kilojoules, kJ) by the 1.4kW kettle while it boils the water?
The energy transferred is given as the product of power and time. The 1.4 kW kettle with boiled water produces 378 kJ of energy.
What is energy?Energy is the quantitative property that determines the work done by the body in the form of heat and light.
The image showing the kettles with time and power is attached below.
Given,
Power of the kettle = 1.4 kW
Time taken = 4.5 minutes
If power = energy ÷ time
Then, energy = power × time
= 1.4 × 0.075
= 0.105 KWh
Therefore, 0.105 kWh or 378KJ is the energy transferred.
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A container of carbon dioxide (CO2) has an initial temperature of 170 K with a pressure of 50 kPa. When the container is heated the pressure is measured at 283 kPa. The volume is constant at 12 L throughout. What is the final temperature of the carbon dioxide (CO2)?
A. 1179.16 K
B. 6.94 K
C. 962.2 K
D. 391.0 K
Answer:
962.2 K
Explanation:
Ideal Gas Law Equation:
PV = nRT
Writing a Equation to find T2:
PV = nRT
(P1V)/(nT1) = R = (P2V)/(nT2)
(P1)/(T1) = R = (P2)/(T2) V and n cancel out since they are constant.
(P1)/(T1) = (P2)/(T2)
T2 = (P2)(T1)/(P1)
Substituting Into the Equation:
T2 = (283 kPa * 170 K)/(50 kPa)
T2 = 962.2 K
9. (05.06 mc)
during an experiment, the percent yield of calcium chloride from a reaction was 80.34%. theoretically, the expected amount should have been 115 grams. what was the actual yield
from this reaction?
caco, + hc - cacl + co, + h20 (5 points)
a. 090.1 grams
b. 92.4 grams
c. 109.2 grams
d. 115.3 grams
The actual yield of the experiment given the data from the question is 92.4 g (Option B)
What is percentage yield?This is the ratio of the actual yield to the theoretical yield of a given reaction multiplied by 100
Percentage yield = (Actual / Theoretical) × 100
What is actual yield?This is the amount obtained from the expriment procedures
What is theoretical yield?This is the amount obtained from simple calculations as regarding the experiment.
How to determine the actual yieldPercentage yield = 80.34%Theoretical yield = 115 gActual yield =?Actual yield = percentage yield × theoretical yield
Actual yield = 80.34% × 115
Actual yield = 0.8034 × 115
Actual yield = 92.4 g
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how many grans of NaoH Are needed to neutralize grans of H2So4
Answer :]
to convert from g NaOH to mol NaOH. = 1.48 g NaOH are needed to neutralize the acid.
A balloon inflated in a room at ayo℃ has a volume
of 4,004, the balloon is then heated to a tempicture of
58°C. What is the new volume if the pressure remains constient?
Answer:
new volume = 4.458 Liters
Explanation:
A balloon inflated in a room at 24°c has a volume of 4.00Liters The balloon is heated to a temperature of 58°c.What is the new volume if the pressure remains constant
charles law
volume1/temperature1 = volume2/temperature2
temperature has to be converted to kelvin
temperature 1 = 24+273=297
temperature 2 = 58+273=
4/297 = volume2/331
volume2 = (4*331)/297
volume2 = 4.45791245791 Liters
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I have ten moles of iron atoms in the reactant side of a reaction. Do I have enough information to determine how many moles of iron atoms I will have following the reaction? If so, how many moles of iron atoms will I have at the end of a reaction? If not, what else do I need to know?
Answer:
See below
Explanation:
If your reaction equation is balanced, you will know the number of Fe atoms following the reaction.....it will be the same on both sides of the equation.
What is the mass of 5.00 moles of KaS04?
A
34.8 grams
B
174 grams
C
675 grams
D
870 grams
Answer: D
Explanation:
I assume you meant [tex]\text{K}_{2}\text{SO}_{4}[/tex].
The atomic mass of potassium is 39.0983 g/mol.The atomic mass of sulfur is 32.065 g/mol.The atomic mass of oxygen is 15.9994 g/mol.So, the formula mass of potassium sulfate is 2(39.0983)+32.065+4(15.9994)=174.2592 g/mol.
So, 5.00 moles have a mass of (5.00)(174.2592), which is about 870 g
When an atom loses an electron, it becomes d. ionized. e. a plasma. a. dissociated. b. an isotope. c. sublimated.
Answer:
When an atom loses an electron it becomes ionized
Which planet do scientists believe prevented the asteroids in the asteroid belt from forming a planet?.
The planet that scientists believe prevented the asteroids in the asteroid belt from forming a planet is Jupiter.
What are asteroids?
Asteroids are known to be leftovers from the formation of the solar system for about 4.6 billion years ago.
Why Jupiter prevented asteroids
The gravity in Jupiter is so strong, that it caused the instability of asteroid orbits within the Kirkwood gapsIt prevented planetary bodies from forming in between Mars and itselfIt also caused small objects to collide with each other and fragment into the asteroids seen todayTherefore, Jupiter made asteroids form group of debris, rather than forming a planet.
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