Answer:
the property of compressibility
How many moles of water are produced if 5.43 mol PbO2 are consumed
Answer:
Then it can be easily concluded that 10.86 moles of water will be produced.
Answer:
10.9
Explanation:
trust i js did the assignment
I need help with these questions fast plz no links!!!!
Answer:
c
B
B
I Hope u can understand and it's correct answer
Read the following reactions.
Reaction 1: NaCl(s) -> Na+ (aq) + CI-
Reaction 2: N2 + 3H2 -> 2NH3
Which reaction leads to an increase in entropy?
Only Reaction 1
Only Reaction 2
Both Reaction 1 and 2
Neither Reaction 1 nor 2
Answer:
Only Reaction 1
Explanation:
In reaction 1, there is a change in state from solid to liquid. Hence, there is an increase in number of ways particles and their energies could be arranged. As a result, entropy increases.
In reaction 2, there is a decrease in amount of gas particles (4 mol to 2 mol). Hence there is a decrease in the number of ways particles and their energies could be arranged. As a result entropy decreases
Only Reaction 1 will lead to an increase in entropy.
What is Entropy?This is the degree of disorderliness or randomness of a particle and it is
denoted as S.
In states of matter, conversion from solid to other states such as liquid
brings about increase in entropy which is why only reaction 1 experienced
this phenomenon.
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Which yield comes from measurements obtained during a real experiment?
A) actual yield
B) theoretical yield
C) percent yield
Answer:
A) actual yield
Explanation:
Actual yield is the amount of product that is actually produced in a chemical reaction.
Theoretical yield is the amount of product expected based on stoichiometry.
Per cent yield is the actual yield over the theoretical yield.
Pls answer ill give brainliest question in picture
Answer: A & D
Explanation:
The two main forces are temperature and salinity.
Please answer correctly I still need help on this. I will give brainliest (No links or fake answers will receive no brainliest)
How many grams of AlCl3 are needed to completely react with 2.25 of NaOH?
Hope the picture help u understand I did it in steps so it would be easier to understand:)
Separation of mixtures by removing a layer of liquid
Answer:
Decantation
Explanation:
Qert + 9wz - asd + 10
Answer:
yes
Explanation:
You have a beaker of water that potentially has Ag+ ions and Ba+ ions (it could have both, one of them, or none of them). How would you design an experiment (flow chart or procedure steps) that will determine which (if any) of these ions are in your water?
Answer:
See explanation
Explanation:
Qualitative analysis in chemistry is a method used to determine the ions present in a solution chiefly by means of chemical reactions.
In this case, I suspect the presence of silver ions and/or barium ions. The first step is to add dilute HCl. This will lead to the precipitation of the silver ion as AgCl. If a white precipitate is formed upon addition of HCl then Ag^+ is present in the solution.
Secondly, I add a carbonate such as NH4CO3(aq). This will cause the barium ions to become precipitated as barium carbonate. Hence, the formation of a white precipitate when NH4CO3(aq) is added to the solution indicates the presence of barium ion in the solution.
Question 21
Which equation is a balanced chemical equation?
A
2NaOH + CaBr2 + Ca(OH)2 + NaBr
B
NO + Cl2 → NOCI
с
CaCO3 + CaO + 2CO2
D
2AlCl3 + 3Mg + 3MgCl2 + 2A|
D
B
Ос
ОА
Answer:
the equation is not correctly written but the answer is option D
The balanced equation among the given options is D, where each of the elements are equal in number on both side.
What is balanced reaction?A balanced chemical equation for a reaction represents perfect stoichiometric ratios of each reactants and products. Each elements have to be equal in number on both sides.
The number of elements or groups can be balanced each side by multiplying with suitable integers. The chemical equation in D is balanced where, Al, Cl and Mg are balanced on both side.
The equation in A, is not balanced where, number of Na and Br are not balanced. In equation B Cl is two in reactant side and one in product side. Thus, not balanced. Similarly in option C, oxygen and calcium are not balanced. Therefore, option D is correct.
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DUE IN 10 MIN!!
Module 5: Directions: Respond to this question to demonstrate your understanding of the topic/content. Be sure to provide adequate and relevant details learned in the module to support your response. Pay close attention to organizing your response so it makes sense and uses correct grammar. Your response should be at least 5-7 sentences at a minimum.
Question: Na + Cl2 --> NaCl
If you were given 15 grams of sodium (with excess chlorine) and asked to determine the amount of NaCl that would be produced (in grams), how would you go about doing it. Be as specific as possible and include numerical values when necessary.
Answer:
I would first convert the grams of sodium into moles of sodium using its molar mass. Next, I would use the ratio of Sodium Chloride to Sodium in the given chemical equation to cancel out the moles of Sodium that I just obtained and get the moles of Sodium Chloride. Finally, using the molar mass of Sodium Chloride, I would cancel out the moles of Sodium Chloride to get the grams of Sodium Chloride.
A 11.0g sample of a compound containing only oxygen and carbon produce 3.0g carbon and 8.0g oxygen. Determined the empirical formula of the compound?
Answer:
Empirical formula: CO₂
Explanation:
The empirical formula is defined as the simplest ratio of atoms present in a molecule. We must convert the mass of carbon and oxygen to moles as follows:
Carbon -Molar mass: 12.01g/mol-
3.0g * (1mol / 12.01g) = 0.250 moles C
Oxygen -Molar mass: 16g/mol-
8.0g * (1mol / 16g) = 0.50 moles O
The ratio of O:C is:
0.50mol / 0.250mol = 2
That means the empirical formula is:
CO₂Balancee por tanteo las siguientes ecuaciones químicas. Escriba el nombre a reactantes y productos. H2O5 + H2O ---> HNO3 Na2O + OH2O --> ONaOH
Answer:
a. N₂O₅ + H₂O ⇒ 2 HNO₃ (pentóxido de dinitrógeno + agua ⇒ ácido nítrico)
b. Na₂O + H₂O ⇒ 2 NaOH (óxido de sodio + agua ⇒ hidróxido de sodio)
Explanation:
Tenemos que balancear, por el método de tanteo, las siguientes ecuaciones químicas.
a. En la primera reacción, el pentóxido de dinitrógeno reacciona con agua para formar ácido nítrico. Es una reacción de síntesis o combinación.
N₂O₅ + H₂O ⇒ HNO₃
Podremos obtener la ecuación balanceada si multiplicamos HNO₃ por 2.
N₂O₅ + H₂O ⇒ 2 HNO₃
b. En la segunda reacción, óxido de sodio reacciona con agua para formar hidróxido de sodio. Es una reacción de síntesis o combinación.
Na₂O + H₂O ⇒ NaOH
Podremos obtener la ecuación balanceada si multiplicamos NaOH por 2.
Na₂O + H₂O ⇒ 2 NaOH
If the pH is 9, what is the concentration of hydroxide ion?
Answer:
10^-5
Explanation:
pOH=14-pH
=14-9
=5
=>-log(pOH)=5
=>OH=10^-5
Which best describes a radioactive isotope?
Answer:
A radioactive isotope, also known as a radioisotope, radionuclide, or radioactive nuclide, is any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays.
Answer:
unstable
Explanation:
If you sprain your ankle and place a cold pack on it, how does the motion of molecules in your ankle change?
Answer:
that heat energy speeds up the motion of the particles and the temperature of the reaction
Explanation:
HOPE IT HELPS
When we place an ice pack on a sprained ankle, the blood flow is reduced which prevents further swelling, ice reduces the blood flow which is necessary when the ankle is injured.
What happens after placing an ice pack?The flow of blood and the lymph vessel is limited or decreased after applying an ice pack, this is an immediate first aid to be given to the injured person
After 2-3 days of the injury, a hot pack should be applied to increase the blood flow and the lymph flow for an activity.
Hence, the molecule flow is reduced after applying an ice pack to the sprained ankle
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What would a chemist most likely study about a car? 1- The amount of rotations of the wheel that occur in 1 mile. 2- The reaction of gasoline combustion in the engine. 3- The accuracy of the speedometer. 4- The strength of the car frame.
Answer:
b
Explanation:
e2020
Answer:B
Explanation:It was correct
Infer: Why might a zone of upwelling be a good place to fish?
First lets define upwelling
Upwelling- a rising of seawater, magma, or other liquid
In this case, you would be looking at a river, lake, ocean, or other body of water good for fishing.
You'd want to look for a place with upwelling because when there is a rise of water, the sea creatures within it will rise too. So the fish in the bottom of a lake for example would be brought up to the surface of the water or near the surface which is where your fishing rod is trying to grab the fish.
I hope this helps! Don't be afraid to reach out with any further questions!
When the sunlight stikes a leaf on a tree, what form of energy is it transformed to?
Answer:
ATP
Explanation:
Answer:
chemical energy
Explanation:
the name for the following formula C9H18 should be
O octane
O octene
O nonane
O nonene
Answer:
cyclononane C9H18 nonane
How many grams of manganese (III) iodide (Mn13) will be needed to make 1.3 grams of hydrogen iodide (HI)? g MnI3
Answer:
I dont know
Explanation:
I need it to
Why does CCl4 dissolve in iodine
Answer: They are both non polar molecules compounds although water is a polar molecule compound. There are no significant attractions.
Please help!
Which of the following ions is in the highest oxidation state?
A. P in H2PO- 4
B. Fe in Fe2O3
C. Cr in Cr2O2- 7
the answer is Cr in Cr2O7.
Explanation:
it's oxidation number is +7 in the compound
while Fe has +3 and P has +6 in their respective compounds
The oxidation state is the gained or lost electrons by an atom to create a chemical bonding. Chromium (Cr) in Cr₂O₂⁻⁷ has the highest oxidation state. Thus, option C is correct.
What is an oxidation state?Oxidation is the representation of the electrons that are lost and gained by an element in a molecule or compound to establish a chemical bond. The oxidation number of free elements is always zero, and hydrogen is usually +1.
The oxidation state of P in H₂PO⁻₄ is given as,
2 (1) + P + 4(-2) = -1
P = + 5
The oxidation number of Fe in Fe₂O₃ is given as,
2Fe + 3O = 0
2Fe + 3(-2) = 0
Fe = + 3
The oxidation number of Cr in Cr₂O₂⁻⁷ is given as,
2Cr + 7O = -2
2Cr + 7(-2) = -2
Cr = + 6
Therefore, chromium (+6) in Cr₂O₂⁻⁷ has the highest oxidation state.
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Anyone tryna help mee
Answer:
It is a solid
What is the product of the unbalanced equation below?
H2(g) + Cl2(9) ►
A. H2(g) + Cl2(9)
B. HCl2(9)
C. HCI(9)
O D. H2C12(9)
Answer:
C. HCI(g)
Explanation:
The following equation between hydrogen gas (H2) and oxygen gas (O2) is given below:
H2(g) + Cl2(g) ►
Based on these unbalanced equation, the products of the reaction was not given, however, if one molecule of hydrogen and oxygen combine, hydrogen chloride (HCl) should be produced as the product of the reaction as in:
H2(g) + Cl2(9) ► 2HCl(g)
Why is creativity important in science?
An element X is found to have atomic mass of Y amu, and it is found that Y is 6.66 times
greater than the atomic mass of carbon-12. Identify X and Y.
Answer:
use grahamns law to get the answer
Which characteristic of water helps it form droplets? (5 points)
A. Low specific heat
B. Nonpolar structure
C. High surface tension
D. Ability to dissolve substances
Answer:
Surface tension causes water to form spherical droplets and allows it to support small objects, like a scrap of paper or a needle, if they are placed carefully on its surface.
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High surface tension is the characteristic of water which helps it form droplets.
What is Cohesion of water ?It is the attractive force between the water molecules. Cohesion is the property of water that explains that how water molecules interact with each other that means water likes to stick to itself.
Now lets check all options one by one:
Option (A): Low specific heat
Water has high specific heat due to the hydrogen bonding.
So, it is incorrect option.
Option (B): Non polar structure
Water molecule is polar covalent molecule because of its shape. The shape of the water molecule is bent.
So, it is incorrect option.
Option (C): High surface tension
Stronger the cohesion force then stronger the surface tension. It is responsible for the shape of the liquid droplets.
So, it is correct option.
Option (D): Ability to dissolve substance
It has ability to form hydrogen bond which makes an water a good solvent. Water is universal solvent.
So, it is incorrect option.
Thus, from above conclusion we can say that High surface tension is the characteristic of water which helps it form droplets.
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how many moles of H are there in 39.2g of H
Answer:
39.2 g
Explanation:
because moles = mass / mr (mr of h is 1)
so 39.2/1= 39.2 moles
hope this helps you to understand :)
List some of the effects of the increased production of
greenhouse gases on the Earth
Answer:
See Explanation
Explanation:
Green house gases are those gases believed to be responsible for the trapping of infrared ray close to the surface of the earth. The effect of the buildup of such gases include;
1) Rise in global temperature; Greenhouse gases trap infrared rays close to the surface of the earth there by leading to a continuous rise in the temperature of the earth. This is known as global warming.
2)Climate Change; Increase in the concentration of greenhouse gases in the atmosphere leads to different patterns of climatic events. This gradual change in the pattern of climatic events is called climate change.
3)Melting of polar ice caps and flooding; Increase in the concentration of greenhouse gases and consequent increase in the earth's temperature leads to the melting of polar ice caps and subsequently flooding in various parts of the world.
