which of earths layers is a liquid
Explanation:
the inner core is solid. the outer core is liquid
HELP!
Calculate the number of moles of water molecules, H2O in 27g of water.
Calculate the mass of 0.25 moles in sodium chloride, NaCL.
Answer:
(1)There are 1.5 moles of water in a 27 gram sample of water. The molar mass of water is 18.02 gmol g m o l .(2)
AnswersChemistryGCSEArticle
What is the mass (g) of 0.25mols of NaCl?
What you need for these equations are a calculator, periodic table and the following equation:
Mass (g) = Mr x Moles (important equation to remember)
In this case we already know the moles as it's in the question, 0.25 moles.
to find the Mr, you need to look at your periodic table. Find the relative atomic mass of Na and Cl and add the two numbers together.
Na = 22.99
Cl = 35.45
NaCl = 58.4
Now just put all of the numbers into the equation.
0.25 x 58.4 = 14.6g
Phosphoric acid (H3PO4) can give up three protons, each with different pKa values consisting of 2.12, 7.21, and 12.67. If plotting pH as a function of sodium hydroxide solution added, which titration curve will be formed?
Answer:
Kindly check the attached picture for the diagram showing the titration curve.
Explanation:
The term "titration" is an important part of chemistry because it is being used in the Determination of the concentration is the unknown.
In this question, the titration is done between a polyprotic weak acid, that is Phosphoric acid (H3PO4) and a strong base, NaOH.
H3PO4 + OH^- -----------------> H2O + H2PO4^-.
H2PO4^-2 + OH^- ---------------> H2O + HPO4^2-
HPO4^- + OH^- ------------------> H2O + PO4^3-.
Which of these statements is supported by the results of Thomson’s experiment? Check all of the boxes that apply
Answer:
1) Cathode rays are made up of negatively charged particles. 2)atoms contain negatively charged particles.3)Thomson's results led to the proposal of new atomic model the plum pudding model.
Explanation:
Answer:
B. Cathode rays are made up of negatively charged particles
C. Atoms contain negatively charged particles
Explanation:
Edge 2021
11. 2073 Set D Q.No. 1 Ammonia molecule has got trigonal
pyramidal geometry even though nitrogen of ammonia gets
sp3 hybridization. Give reason.
[2]
Answer:
See explanation
Explanation:
I know that we usually associate the sp3 hybridization to the tetrahedral shape. This is common in molecules such as CH4. So it may sound somewhat strange that NH3 molecule has an sp3 hybridized nitrogen atom and a trigonal pyramidal geometry.
Let us recall that the central nitrogen atom in NH3 has a lone pair of electrons. These lone pairs causes more repulsion than bond pairs. As a result of the presence of this lone pair, the bond angle in the NH3 molecule is distorted away from the expected 109.7 degrees in tetrahedral geometry and the bonding groups are now arranged in a trigonal pyramidal geometry(with bond angle less than 109.7 degrees) to minimize electron pair repulsions.
Olive oil has a density of 0.917 g/mL. What is the volume, in gallons, of 50.0
pounds of olive oil
Answer:
[tex]V=6.54L[/tex]
Explanation:
Hello!
In this case, since we are given the density in g/mL, the first step is to compute the mass in grams as shown below:
[tex]m=50.0lb*\frac{454g}{1lb} =22700g[/tex]
Now, we use the density to compute the volume as follows:
[tex]V=22700g*\frac{1mL}{0.917g} =24.755mL[/tex]
Finally, we convert to gallons:
[tex]V=24755mL*\frac{1L}{1000mL} *\frac{1gal}{3.7854L}=6.54L[/tex]
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what is the density of a substance if 5.000 ml has a mass of 5.025 grams?
Answer:
1 Expert Answer
5.025 g/5 ml = 1.005 g/ml = density This has a specific gravity less than the typical range of 1.012-1.030 and thus might indicate type-2 diabetes
Explanation:
give me brianlist
For the following molecules, what is the order of Bronsted acidity, from highest to lowest
Answer:
Rank these compounds in order of increasing basicity. (Least basic to most basic)
a. C, B, A
b. B, A, C
c. C, A, B
d. A, B, C
ANSWER: d
I did the quiz already **spoil alert ace that quiz baby heck yea**
Explanation:
If u need proof that its correct the image below with help!
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Bones Are hard because of the calcium deposited inside
true or false
What does an electric field
surround?
Answer:
An electric field is the physical field that surrounds each electric charge and exerts force on all other charges in the field, either attracting or repelling them.
______________
meow
Need help asap please! This is for a very important test. Giving brainliest to best answer
Two different atoms have four protons each and the same mass. However, one has a negative charge while the other is neutral. Describe what each atomic structure could be, listing the possible number and location of all subatomic particles.
Answer:
The three subatomic particles are the particles contained in the iota. They are protons, neutrons, and electrons. Protons and electrons convey a positive and negative charge, individually, while neutrons don't convey any change
Explanation:
What factors contribute to how quickly rock is eroded or deposited?
Answer:
Water flowing over Earth's surface or underground causes erosion and deposition. Water flowing over a steeper slope moves faster and causes more erosion. How water transports particles depends on their size. When water slows down, it starts depositing sediment.
Explanation:
How many atoms in 5.01 mole of lead?
Answer:
30.17 × 10²³ atoms
Explanation:
Given data:
Number of moles of lead = 5.01 mol
Number of atoms = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
In given question:
1 mole = 6.022 × 10²³ atoms
5.01 mol × 6.022 × 10²³ atoms / 1 mol
30.17 × 10²³ atoms
What is the momentum of a car with a mass of 1500 kg traveling north at a speed of 30 m/sec?
Answer:45kg
Explanation:
The momentum of a car with a mass of 1500 kg traveling north at a speed of 30 m/sec is 45000 kg-m/s.
What is momentum ?
The term momentum is defined as the product of the mass and velocity of an object. It is a vector quantity, having a magnitude and a direction. If m is an object's mass and v is its velocity, then the object's momentum p is: mass × velocity.
When you throw a ball at someone, and it hits him square in the face. It shows how difficult it would have been to put a stop to the thing. A baseball flies through the air. A large truck is on the move. A bullet fired from such a weapon.
Given:
Mass of the car, m = 1500 kg
Speed of the car, v = 30 m/s (towards north)
We have to find The momentum of the car,
Solution:
Let p is the momentum of an object. It can be calculated by the product of mass and its velocity. The formula to find it is given by :
p = m × v
= 1500 × 30
= 45000
Thus, the momentum of a car with a mass of 1500 kg traveling north at a speed of 30 m/sec is 45000 kg-m/s.
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The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. A compound exhibits intense absorption at 1715 cm-1 but none above 3000 or in the 1000-1350 cm-1 range.
Relative absorption intensity: (s)=strong, (m)=medium, (w)=weak.
What functional class(es) does the compound belong to?
List only classes for which evidence is given here. Attach no significance to evidence not cited explicitly.
a. alkane (List only if no other functional class applies.)
b. alkene h. amine
c. terminal alkyne i. aldehyde or ketone
d. internal alkyne j. carboxylic acid
e. arene k. ester
f. alcohol l. nitrile
g. ether
Answer:
B.
Explanation:
Functional group can be interconverted into each ther by the means of suitable reagent. Functional group are responsible for the chemical and physical properties of a compound. The given spectral data represents alkene.
What is functional group?A group of atoms forming a component of a molecule that accounts for a particular function or chemical behavior is called a functional group. There are so many functional group in organic chemistry.
The list of functional group are as follow:
Carboxylic group COOH
Alcoholic group OH
Ammine group NH₂
Alkene -c=c-
Ketonic group R-CO_R
Aldehydic group R-CHO
Thiol group R-S-H
Cyanide group -CN
Functional group can be detected by using spectral data. The given spectral data represents alkene.
Therefore the correct option is option B.
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You are performing a chemical reaction using the following equation:
2 AgI + Na2S → Ag2S + 2 NaI
You realize that you're running low on both of your reagents. You have 200.0 g each of AgI and of Na2S. What is the maximum amount of Ag2S that can be produced?
Answer: max Ag2S 159 g
Explanation:
at wts Ag 107.87, I 126.9, Na 22.99, S 32.065
AgI 234.76, Na2S 87.12, Ag2S 172.0, NaI 149.6
2(mol)AgI + 1(mol)Na2S —> 1(mol)Ag2S + 2(mol)NaI
200g AgI = 200/107.87 mol = 1.85 mol
200g Na2S = 200/87.12 mol = 2.3 mol, so AgI is limiting.
2 mol AgI —> 1 mol Ag2S, so
1.85 mol AgI —> 1.85/2 mol Ag2S
1 mol Ag2S = 172 g
max Ag2S = 172*1.85/2 g = 159g
Explain why some regions in Canada or the United States may be more susceptible to the effects of acid rain
Answer:
Explanation: The damage is often greatest in mountainous regions, because these areas often receive more acid deposition than lower areas and the winter environment is more extreme.
On the basis of strength of intermolecular forces, which of the following elements would be expected to have the highest melting point?
Answer:
I think its Kr
Explanation:
sorry if I'm wrong
Bromine (Br₂) has the highest melting point among the given elements. Therefore, option (A) is correct.
What are intermolecular forces?Intermolecular forces can be described as the attractive and repulsive forces that develop between the molecules of a substance. These forces are responsible for most of the chemical and physical properties of matter. The intermolecular forces between the molecules are Vander Waals forces.
Forces that exist between the molecules themselves are known as intermolecular forces. The particles of solids and liquids are held together by intermolecular forces.
The intermolecular forces are Dipole-Dipole Interactions, Ion-Dipole Interactions, Ion-Induced Dipole Interactions, Dipole-Induced Dipole Interaction, and Dispersion Forces.
As the size of the atoms increases the strength of the intermolecular force also increases and a large amount of energy will be required to break bonds. Since Bromine has the largest size among the all other elements. Therefore, Bromine will have the highest melting point.
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Your question was incomplete, but the complete question was,
On the basis of the strength of intermolecular forces, which of the following elements would be expected to have the highest melting point?
A) Br₂
B) Cl₂
C) F₂
D) N₂
calculate the relative atomic mass
Answer:
add the isotopes atomic masses and divide by their number
Explanation:
Iron metal reacts with elemental oxygen to form rust according to the unbalanced reaction, Fe(s) + O2(g) → Fe2O3(s),. What is the coefficient of the iron, Fe(s), in the balanced reaction?
a
1
b
2
c
3
d
4
Time left for this assessment:
48:49
Answer:
c. 3
Explanation:
The unbalanced reaction expression is given as:
Fe + O₂ → Fe₂O₃
To balance the expression gives the coefficient of oxygen.
Assign the coefficients a,b, c and use a mathematical approach to solve this problem:
aFe + bO₂ → cFe₂O₃
Conserving Fe: a = 2c
O: 2b = 3c
Now let c = 1, a = 2, b = [tex]\frac{3}{2}[/tex]
Multiply through by 2,
a = 4, b = 3 and c = 2
4Fe + 3O₂ → 2Fe₂O₃
The coefficient of O₂ is 3
Which of the following reactions in a redox reaction?
a
2 Mg(s) + O2(g) → 2 MgO(aq)
b
HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)
c
Pb(NO3)2(aq) + KCl(aq) → PbCl2(aq) + KNO3(aq)
d
CaCO3(s) → CaO(s) + CO2(g)
Answer:
a
2 Mg(s) + O2(g) → 2 MgO(aq)
Explanation:
Please help asap and thank you
Answer:
Metamorphic rock
Explanation:
metamorphic rocks do not get hot enough to melt they just get denser if they did they would become igneous rocks.
10 points
How many total atoms are in 3(NH4)2S
Answer:
33atoms
Explanation:
An atom is the smallest particle that can take part in a chemical reaction.
The given compound is:
3(NH₄)₂S
Here we have 3 moles of (NH₄)₂S ;
So:
Total number of atoms:
2 atoms of N
2 x 4 atoms of H
1 atom of S
Total = 2 + 8 + 1 = 11 atoms
So;
The total atom = 3 x 11 = 33atoms
Which best summarize the scientist process that led to our current understanding of DNA
Answer:
Each scientist made an important, but unrelated, contribution. Scientists built on the previous work of other scientists to make new discoveries. Most of the discoveries were made by chance and did not depend on prior knowledge.
Explanation:
i hope i helped * :3
Hydrogen sulfide (H2S) is a gas that smells like rotten eggs. It can be produced by bacteria in your mouth and contributes to bad breath. It also causes silver to tarnish so you can actually blacken silver with your breath! Let's use H2S to explore the difference in pressure exerted by an ideal versus a van der Waals gas. Calculate the pressure exerted by 1.00 mol of H2S behaving as
Answer:
See explanation.
Explanation:
Hello!
In this case, we consider the questions:
a. Ideal gas at:
i. 273.15 K and 22.414 L.
ii. 500 K and 100 cm³.
b. Van der Waals gas at:
i. 273.15 K and 22.414 L.
ii. 500 K and 100 cm³.
Thus, we define the ideal gas equation and the van der Waals one as shown below:
[tex]P^{id}=\frac{nRT}{V}\\\\ P^{vdW}=\frac{RT}{v-b}-\frac{a}{v^2}[/tex]
Whereas b and a for hydrogen sulfide are 0.0434 L/mol and 4.484 L²*atm / mol² respectively, therefore, we proceed as follows:
a.
i. 273.15 K and 22.414 L.
[tex]P^{id}=\frac{1.00mol*0.08206\frac{atm*L}{mol*K}*273.15K}{22.414L}=1 .00 atm[/tex]
ii. 500 K and 100 cm³ (0.1 L).
[tex]P^{id}=\frac{1.00mol*0.08206\frac{atm*L}{mol*K}*500K}{0.100L}=410.3 atm[/tex]
b.
i. 273.15 K and 22.414 L: in this case, v = 22.414 L / 1.00 mol = 22.414 L/mol
[tex]P^{vdW}=\frac{0.08206\frac{atm*L}{mol*K}*273.15K}{22.414L/mol-0.0434L/mol}-\frac{4.484 atm*L^2/mol^2}{(22.414L/mol)^2}=0.993atm[/tex]
ii. 500 K and 100 cm³: in this case, v = 0.1 L / 1.00 mol = 0.100 L/mol
[tex]P^{vdW}=\frac{0.08206\frac{atm*L}{mol*K}*500K}{0.100L/mol-0.0434L/mol}-\frac{4.484 atm*L^2/mol^2}{(0.100L/mol)^2}=276.5atm[/tex]
Whereas we can see a significant difference when the gas is at 500 K and occupy a volume of 0.100 L.
Best regards!
What is an aqueous solution compound
A. insoluble
B. soluble
C. precipitate
D. solid
Answer:
C. Soluble
Explanation:
An aqueous solution is one in which the solvent is liquid water. That is, solute (dissolved) ions and molecules are surrounded by water molecules and incorporated into the network of bonds within the water. The dissolved species then spread throughout the water
What determines the strength of the attraction between molecules?
Answer:
rigidity ,if the substance easily not changing it's state by giving heat then it shows strong force of attraction
How many grams of potassium permanganate contain 2.40 x 10^24 oxygen atoms?
Answer: 2.4e+24
Explanation:
It could just as easily have been selected to be 1/24th of the mass of one atom of a carbon atom, or 1/10th the mass of a calcium atom, A sample of 250 grams is equivalent to 1.58 moles of potassium permanganate.
Kinetic Energy is ......
A. always increasing.
B. the energy of motion.
C. weakest at high temperatures.
D. dependent on an object's position
Answer:
b because I know this
Explanation:
trust me I am I. 6th grade straight a's
Which of the following represents 0.007462 rounded to two significant figures?
Answer:
0.0075 or 7.5x10⁻³
Explanation:
Hello!
In this case, when rounding to two significant figures a number that is less than 1, we take into account that the left-handed zeros, prior to the first nonzero digit are not significant, for 0.007462, two significant figures include the 7 and the 4; however, that 4 is rounded up to 5 since there is a 6 after it, and therefore, the correct representation would be either of the following ones:
0.0075
7.5x10⁻³
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