A solution is made by combining 15.0 g of potassium chloride with 100 g water at room temperature. What is the concentration of this solution
Answer:
Freezing point depression=2×1.027⋅mol⋅kg−1×1.86⋅K⋅kg⋅mol−1=3.82⋅K .. And so the fusion point of the solution will be −3.8 ∘C .
A Carnot engine takes 2000 j of heat from a reservoir at 500 k, does some work and discards some heat to a reservoir at 350k . how much work does it do, how much heat is discarded, and what is it's efficiency?
Answer:
Explanation:
The Carnot engine is a theoretical or conceptual heat engine that has a higher efficiency than any practical or theoretical heat engine working between the same temperature range. The theoretical efficiency of a Carnot engine is considered as the highest efficiency and no practical heat engines can operate at that efficiency. A Carnot engine draws heat energy, performs useful work and the leftover energy is released from the working substance. According to the second law of thermodynamics, there must be a temperature gradient between the heat energy drawing point and release point of the heat engine.
dubnium chloride chemical formula
Answer:
Db
Dubnium/Symbol
Explanation:
please mark my answer in brainlist plz
Answer:
DbCl5
Explanation
Dubnium has 2 electron in 7s orbital and 3 electron in 6d orbital. Because Dubnium is synthetically produced with atomic number of 105, it is highly radioactive and quickly decay. Like other transition, it can have different oxidation state and it is assumed that dubnium have +3,+4,+5 oxidation state number(that most likely involves electron from 6d orbital). Hence chloride ions with -1 oxidation number would react to form Dubnium Chloride as DbCl3, DbCl4, and DbCl5. Now it is highly unlikely these compounds can really be formed. However if you read nature chemistry article https://www.nature.com/articles/nchem.2610, there is mention that DbCl5, DbBr5, and DbOCl3 may be expected to form.
The law of conservation of matter states that matter can be neither created nor destroyed. Your friend shows you the following chemical equation: CaCO,CaO+CO, He says that because the oxygen atoms are split between two different molecules in the products, the equation does not support the law of conservation of matter. Is your friend right? Explain your answer.
Answer:
According to conservation of matter, there should be equal amounts of all elements on both the reactant and product side.
Reactant:
1 Ca
1 C
1 O
Product:
1 Ca
1 C
3 O
Therefore, your friend is right because the law of conservation of matter is not followed in this chemical equation.
Explanation:
Which of the following are used to administer liquid medications orally? O a) Syringes b) Vials c) Suppositories d) Droppers e) Teaspoons
Answer:
D
Explanation:
For an imaginary closed economy, T = $5,000; S = $11,000; C = $48,000; and the government is running a budget surplus of $1,000. Then
Based on the information given, the private savings will be $10000 and the gross domestic product is $63000.
From the information given, he following can be gotten:
T = $5,000S = $11,000C = $48,000Budget surplus = $1000Since, S = Y - C - G
11000 = Y - 48000 - G
Y - G = 48000 + 11000
Y - G = 59000
Budget surplus = T - G = 1000
5000 - G = 1000
G = 5000 - 1000 = 4000
The GDP will be:
Y - G = 59000
Y - 4000 = 59000
Y = 59000 + 4000 = 63000
Private savings = Y - T - C
Private savings = 63000 - 5000 - 48000
Private savings = 10000
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What is the daughter nucleus of pt-199 after a beta decay?
A. At-198
B.At-200
C.Pt-200
D.At-199
B. At-200
In beta decay the atomic number increases by 1
If 16800 J of energy are added to 4200g of water, what will the change in temperature (delta T) of the water be? Specific heat of water is 4.184 J/gºC *
Answer:
okkkkkkkkkkkkkkkkkkkkkkkkkkk
Pure silver has a brilliant white metallic luster. How many moles of silver, Ag, are in 7.54 × 1023 atoms of silver?
The number of moles of silver, Ag, that are in 7.54 × 10²³ atoms of silver is 1.25 moles
From the question,
We are to determine the number of moles of silver, Ag, that are present in 7.54 × 10²³ atoms of silver
From the formula
[tex]Number\ of\ moles =\frac{Number\ of\ atoms}{Avogadro's\ constant}[/tex]
Avogadro's constant = 6.022 × 10²³ atoms mol⁻¹
and
From the given information
Number of silver atoms = 7.54 × 10²³ atoms
Putting the parameters into the formula, we get
Number of moles of silver present = [tex]\frac{7.54\times 10^{23} }{6.022\times 10^{23}}[/tex]
Number of moles of silver present = 1.2520757 moles
Number of moles of silver present ≅ 1.25 moles
Hence, the number of moles of silver, Ag, that are in 7.54 × 10²³ atoms of silver is 1.25 moles
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what is the continent bellow the world?
Answer:
antarcita
Explanation:
Answer:
What is the continent bellow the world?
Antarctica is the continent below the Earth.Which is warmer -30C or -30 F?
-30°F is warmer than -30°C.
The -ve sign is used when the temperature drops down. Celsius is the greater unit. By converting, -30°F = -1.11°C (approx.) We know that, -1.11 > -30. So, -30°F (-1.11°C) is warmer than -30°C.
Formula :-
(x°C × 9/5) + 32 = y°F
_____
Hope it helps ⚜
Answer:
-30 c is warmer
Explanation:
-30 c =-22 f
-30 f=-34.444 c
i. Three different representations of glucose are
given below. Identify each type
of model.
Answer:
Ball and stick model is 3D and has the atoms depicted as different Coloured balls Conected to each other by "sticks"
fischer projection has the atoms on the side coming out of the plane, the atoms at the ends going behind (going away from you)
bond line notation Is the most common it does not show the C or H bonds but instead carbons are represented by the bends
The three structures of glucose represent three different models, they are ball and stick model, Fischer projection and bond line notation, respectively.
Glucose is a type of simple sugar (carbohydrate) that does not further hydrolyze to give monosaccharides.
Ball and stick model: The atoms are portrayed as different colored balls connected to each other by "sticks." Fischer projection: The atoms on the sides of the plane are coming out of the plane, while the atoms at the ends are moving behind.Bond line notation: It is the most frequent representation method used; it lacks C and H bonds but instead depicts carbons through bends.Therefore, the three glucose structures reflect three distinct models: the ball and stick model, the Fischer projection, and the bond line notation, respectively.
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what is the name of the compound CaCo3
Hydrogen gas reacts with oxygen gas to form water. What is the excess reactant in this recation(Refer to the picture below to answer).
A. Water
B. Hydrogen gas
C. Oxygen gas
D. Water and oxygen gas
Answer: C. Oxygen Gas
Explanation: When Hydrogen Gas and Oxygen Gas combine together it forms water correct. When you have an excess amount of another it stays neutral because it has no other molecule to react with.
Apply Concepts
6. Describe the ecosystem in the picture.
a. Anna's chemistry class is going to be experimenting with AgNO3 today, which
can stain hands and clothes. Anna is concerned about her jewelry, so as she
gets ready for school, she removes her gold (Au) ring andreplaces it with a
cheaper nickel (Ni) ring. Is this a good idea? Explain your answer. (3 points)
Answer:
No. While gold would not react with a silver nitrate solution, nickel would.
Explanation:
Refer to the metal reactivity series.
Reactivity: [tex]\text{Gold} < \text{Silver} < \text{Nickel}[/tex].
Gold is positioned after silver in the reactivity series, meaning that gold is typically less reactive than silver. Thus, gold would not react with a solution of silver ions to produce silver metal.
However, since nickel is positioned before silver in the reactivity series, it is expected that nickel would react with silver ions in this solution to produce silver metal.
Thus, if the silver nitrate solution comes into contact with the two rings, the nickel ring would likely react with the solution, the gold ring would not.
What is the percentage of nitrogen in ammonium chloride (NH4Cl)?
Answer:
25%
Explanation:
Ammonium Chloride NH4CI Fertilizer-grade NH4Cl usually contains 25% N. About two-thirds of the world capacity for manufacture of this material is located in Japan, with the remaining one-third situated in India and China.
What physical property does salt have when it is dissolved in water?
And
What type of mixture is salt water?
What is the molarity of aqueous lithium bromide if 25.0 mL of LiBr reacts with 10.0 mL of 0.250 M Pb(NO 3) 2
The molarity of aqueous lithium bromide, LiBr solution is 0.2 M
We'll begin by calculating the number of mole of Pb(NO₃)₂ in the solution.
Volume = 10 mL = 10 / 1000 = 0.01 L Molarity of Pb(NO₃)₂ = 0.250 MMole of Pb(NO₃)₂ =?Mole = Molarity x Volume
Mole of Pb(NO₃)₂ = 0.25 × 0.01
Mole of Pb(NO₃)₂ = 0.0025 mole
Next, we shall determine the mole of LiBr required to react with 0.0025 mole of Pb(NO₃)₂
Pb(NO₃)₂ + 2LiBr —> PbBr₂ + 2LiNO₃
From the balanced equation above,
1 mole of Pb(NO₃)₂ reacted with 2 mole of LiBr.
Therefore,
0.0025 mole of Pb(NO₃)₂ will react with = 2 × 0.0025 = 0.005 mole of LiBr
Finally, we shall determine the molarity of the LiBr solution
Mole = 0.005 mole Volume = 25 mL = 25 / 1000 = 0.025 L Molarity of LiBr =?Molarity = mole / Volume
Molarity of LiBr = 0.005 / 0.025
Molarity of LiBr = 0.2 M
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2CH3CHO+O2=> 2CH3COOH
Answer:
2CH3CHO + O2 → 2CH3COOH
A baker was baking a cake which has burnt due to over heating. What kind of change is this ?
reversible
irreversible
burnt
heating
Which of the following is not a place where hydrogen can be found on Earth?
A) Natural gas well
B)
Water
Mine
Atmosphere
Answer:
Atmosphere
Explanation:
Natural gas is mainly hydrocarbons like C3H8 and that has hydrogens, water is H2O and had hydrogens, mines have it in the minerals.
activation energy in reaction is used to:
A- Overcome repulsion force between colliding molecules
B- Breaking bonds
C- Merge Valence electrons
D- All of them
Answer:
D — All of them
Explanation:
The activation energy in a reaction is the minimum amount of energy required for a chemical reaction to take place. Since all the options are processes in a chemical reaction, D should be the answer.
An earthquake's____
located directly above its_____
Answer:
An earthquake's what happens when two blocks of the earth suddenly slip past one another.
located directly above its The epic Center
Explanation:
Hope this helps you !!Below the time line, list the layers from oldest to youngest
Answer:
F,E,D,C, B, A, G, H, I
Explanation:
I think. It goes bottom to top. the fault probably cause g to happen and maybe h but mattering on what caused what I am not positive
Elements with ________ atomic mass are best possible candidates for a fusion reaction. very low moderate to heavy moderate very heavy
very low
Explanation:
Nuclear fusion is a nuclear reaction wherein small nuclei are combined to form heavier nuclei. This process constantly occurs in the sun, which is mainly composed of hydrogen and helium atoms.
In a Lewis Diagram for fluorine, are the two electrons given to the other fluorine atom, taken by the other fluorine atom, or shared between the fluorine atoms?
What is a system?
A. A piece of scientific equipment
B. A liquid in which reactions take place
C. A technique for recording data
D. An isolated piece of the world
Answer:
C
Explanation:
A system is often defined as a procedure (a way to outline steps). C makes the most sense here.
Answer all questions please and be quick, it’s very URGENT
hi uhm
Explanation:
it's dark and lighting
Which hypothesis is most supported by astronomers?
A- The universe is currently expanding and will continue to expand.
B- Stars could burn out, causing the universe to become dark and cold.
C- Gravity could pull galaxies back together, causing a reverse of the big bang.
D- Dark energy will pull the universe together to form a massive black hole.
HURRY!!
Answer:
option A is the most supported hypothesis by astronomers