Answer:
answering this for points! Sorry! but its probably A OR C
Explanation:
There are three main parts to any dissolution which result in an energy change, either endothermic or exothermic. Consider the dissolution of sodium chloride and explain what each of these three major energy changes are.
Answer:
The dissolution of sodium chloride involves three steps. During the process energy changes occur in:
1. breaking apart the hydrogen bonds between water molecules,
2. breaking apart the electrostatic bonds between sodium and chloride ions, and
3. when bonds are formed between water molecules and aqueous ions in solution.
Since the energy used to break apart the hydrogen bonds between water molecules and the energy used to break apart the electrostatic bonds between sodium and chloride ions, is greater than the energy released when bonds are formed between water molecules and aqueous ions in solution, the dissolution of sodium chloride is endothermic.
Explanation:
The heat of solution or enthalpy of solution/dissolution, is the enthalpy change that occurs with the dissolution of a solute in a solvent at constant pressure, resulting in infinite dilution. Its unit is kJ/mol for reactions taking place under standard conditions (298.15 K and 1 atm).
The process of dissolution occurs in three energy-dependent steps:
1. The breaking of bonds within the solute. For example, electrostatic forces of attraction between two oppositely-charged ions. This process is endothermic.
2. The endothermic process of breaking of intermolecular forces within the solvent, e.g. hydrogen bonds in water.
3. The exothermic process of the formation of new solute-solvent bonds in solution.
The sum of the energies involved in these three steps gives the enthalpy of dissolution of a solute. The overall process of dissolution can either endothermic or exothermic depending on the amount of energy used or released in breaking and making bonds. If more energy is released in making than is used in breaking bonds, it is exothermic. However, if more energy is used in breaking bonds than is released in making bonds, dissolution is then endothermic.
For example, considering the dissolution of sodium chloride. During the process the energy used to break apart the hydrogen bonds between water molecules and the energy used to break apart the electrostatic bonds between sodium and chloride ions, is greater than the energy released when bonds are formed between water molecules and aqueous ions in solution. Therefore, the dissolution of sodium chloride is endothermic.
1s2, 2s2, 2p6, 3s2, 3p6, 4s2
How many shells does this atom have?
Answer:
4
Explanation:
A 250 mL glass of orange juice cantains 22 grams of sugar. How much sugar is in a two liter (2,000 mL) bottle of orange juice?
Answer: 44000 g
Explanation:
For every 250mL of juice, there is 22g of sugar. So for 2000mL,
2000*22g = 44000g of sugar in the bottle of juice
plz someone help with this
Answer:
4 I believe is false and 5 is D I think
Answer:
4.) A. (TRUE)
5.) B. (THE WEATHER AND CLIMATE)
Explanation:
I HOPE IT HELPS YOU;)
H3PO4 + HCI
PCI5+H2O
Answer:
Balanced Chemical Equation:
H3PO4 + 5HCl → PCl5 + 4H2O
explain what keeps the electrons confined in the space surrounding the nucleus
Answer:
Electrons are trapped inside the atom because of the attraction forces with positively charged protons that are found in the nucleus.
Wendy wants to find out if a substance is an acid or a base. What are two ways that Wendy could
investigate to find out what kind of substance it is?
Without tasting a colorless liquid, an acid or a base can be determined using indicators.
The three most common indicators to test for acids and bases are: Litmus. Methyl orange. Phenolphthalein.
How do you know something is an acid?One practical method for determining how acidic something is is to use the pH scale. A solution is acidic if its pH is less than 7. If the pH of the solution is 7, it is neutral; if the pH is greater than 7, it is basic.To identify acids and bases, two types of litmus paper are available: red litmus paper and blue litmus paper. When exposed to acidic conditions, blue litmus paper turns red, while red litmus paper turns blue when exposed to basic or alkaline conditions.
To learn more about : Indicators
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I'll give Branliest to the most efficient and first answer.
1. What major change in our thinking about the path of a moving electron had to be made with the advent of quantum theory?
2. Calculate the wavelength of a space shuttle with a mass of 2.05 x 107kg traveling at a rate of 7.85 x 103 m/s.
Answer:
See explanation
Explanation:
1) With the advent of the quantum theory came the idea that the path of a moving electron can not be exactly determined. We can only talk about the probability of finding the electron within a given region in space.
2) Using the De Broglie's relation;
λ = h/mv
Where;
λ = wavelength
h = Plank's constant
m = mass
v = velocity
λ = 6.6 * 10^-34/2.05 x 10^7 * 7.85 x 10^3
λ = 4.1 * 10^-25 m
MARKING BRAINLIEST
options: Tempature
solid
melting point
time
condensation point
gas
freezing point
liquid
boiling point
Answer:
I LIKE TRAINS
Explanation:
SNAILS ARE YUMMY
Plants absorb water in the soil through their roots and pump this water up to deliver
nutrients to their leaves. This pumping is driven by the evaporation of water through
small pores on the undersides of leaves. What is this process called?
A)germination
B)pollination
C)respiration
D)transpiration
Why do you think males and children are more likely to die from DHMO
Answer:
Dihydrogen Monoxide (DHMO) is perhaps the single most prevalent of all chemicals that can be dangerous to human life. Despite this truth, most people are not unduly concerned about the dangers of Dihydrogen Monoxide. Governments, civic leaders, corporations, military organizations, and citizens in every walk of life seem to either be ignorant of or shrug off the truth about Dihydrogen Monoxide as not being applicable to them. In 1997, the Dihydrogen Monoxide Research Division was formed and went online spreading the truth about DIHYDROGEN MONOXIDE. As word has spread, so too has the public awareness of Dihydrogen Monoxide and its implications involving the Internet and accessibility of such information. To that end, the DMRD's web site at DHMO.org continues to provide the most comprehensive collection of Dihydrogen Monoxide information available anywhere.
Explanation:
DHMO has been the dihydrogen monoxide. It has been responsible for the death of males and children as it causes tissue damage.
The DHMO has been the hydric acid and is one of the major constituents of acid rain. Gas has been responsible for greenhouse gas. Ingestion may lead to tissue damage with symptoms of nausea, vomiting, and electrolyte imbalance.
The companies dumping waste in the rivers and lakes have been warned for the removal of DHMO as it has been harmful to the males and children, and results in death.
For more information about Dihydrogen Monoxide, refer to the link:
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Explain how you can convert from the number of representative particles of a substance to moles of that substance.
Answer:
the number of representative contain in 1 mol of a substance equals to 6.o2x10^23 particles.Number of representative particles of a substance can be converted to moles of that substance by multiplying it by Avogadro's number as 1 mole=6.023 ×10²³.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
Learn more about Avogadro's number,here:
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Which statement about copper, diamond, and silicon(IV) dioxide is correcta)Copper and silicon(IV) dioxide have similar electrical conductivityb)In diamond the carbon atoms are covalently bonded as flat sheetsc)In silicon(IV)dioxide the silicon and oxygen atoms are covalently bonded in flat sheetsd)The structure of copper includes a lattice of positive ions
Answer:
In diamond the carbon atoms are covalently bonded as flat sheets
In silicon(IV) dioxide the silicon and oxygen atoms are covalently bonded in flat sheets
The structure of copper includes a lattice of positive ions
Explanation:
Diamond and silicon(IV) dioxide are covalent network solids. Covalent network solids are made up of atoms joined to one another by covalent bonds to form a giant lattice, The solids are hard and have a very high melting point. They do not conduct electricity. So, for both diamond and SiO2, atoms are covalently bonded to yield flat sheets in a covalent bonded network solid.
Copper is a metallic substance having metallic bonds, a metallic crystal consists of positive ions and a cloud of electrons.
Helppp
me plzzz!!!!
Answer:
Explanation:
The sound waves are bocing off the walls.
please help me!! (brainliest)
Answer:
ok
Explanation:
how many moles of water are required to produce 2.15 mol oxygen gas in this reaction
an example of xenon (Xe)
Answer: i am not sure what you mean but here are some product of xenon stroboscopic lamps, photographic flash lamps, high-intensive arc-lamps for motion picture projection, some lamps used for deep-sea observation, bactericidal lamps, sunbed lamps and high-pressure arc all use this gas. In fact, you probably see xenon lamps on a regular basis and if you want compounds : Xe2F2, XeF4, XeO3, XeF6....
Explanation:
A scientist is comparing 2 samples of the same compound. One is pure and the other is impure. The compound is a solid at room temperature. Explain how the scientist could tell which is the pure compound. [2]
Answer:
A glass of mineral water is not pure water.
Explanation:
Pure chemical substances
Pouring water into a glass from a bottle
Food and drink may be advertised as ‘pure’. For example, you may see cartons of ‘pure orange juice’ or ‘pure mineral water’. This means that nothing else was added to the orange juice or mineral water during manufacture. However, these substances are not pure to a scientist. In science, a pure substance contains only one element or compound.
Mineral water is mostly water, but there are other substances mixed with it. These are the ingredients that you see listed on the bottle’s label.
BF3
What is The calculation and bond type
A gas at 127 celsius and 10.0 L expands to 20.0 L. What is the new
temperature in kelvin? (You must convert to Kelvin before calculating
this problem
Answer:
800.3 Kelvin
Explanation:
127°C = 400.15 Kelvin (because 127 + 273.15)
Charles Law:
[tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex] Thus, [tex]\frac{10.0 L}{400.15 K} = \frac{20.0 L}{T2}[/tex]
Then, work out the math algebraically.
T2 = 20.0 / (10.0/400.15)
= 20.0 / 0.02499...
= 800.3 Kelvin
This is assuming the pressure remains constant.
How many moles of water are contained in 3.58 x 10^24 molecules? 6.022
x 10^23 molecules = 1 mole
O 5.94 moles
0 10.0 moles
0 022 x 10^23 moles
0 3.00 moles
Answer:
Try everything
O 5.94 moles
0 10.0 moles
0 022 x 10^23 moles
0 3.00 moles
Explanation:
What is your observation of the relationship between m and a
Answer:
They are both letters?
Explanation:
Find the percent composition of chromium(|||) fluoride (CrF3), which is commonly used as a dye in textiles
Answer:
%Cr = 47.71%
%F = 52.29%
Explanation:
To do this, we need the atomic weights of all the elements in the chromiun fluoride, which are the following:
Cr: 51.996 g/mol
F: 18.998 g/mol
With these atomic weights, let's calculate the molecular mass of the chromium fluoride:
MM CrF₃ = (51.996) + (18.998 * 3) = 108.99 g/mol
Now, to get the percent composition, all we have to do is divide the atomic weight of each element by the molecular mass, and then, multiply by 100%:
% = (AW / MM) * 100
Replacing with each element:
%Cr = (51.996 / 108.99) * 100
%Cr = 47.71%%F = 100 - 47.71
%F = 52.29%Hope this helps
Which energy transformation describes what occurs in a circuit? (select
the BEST answer)
chemical --> electrical --> light
thermal --> chemical --> light
electrical --> thermal --> light
Olight --> thermal --> chemical
Answer:
electrical --> thermal --> light
Explanation:
Answer:
electrical--> thermal--> light
Please help fast. I will give brainliest.
Answer:39 min
Explanation:
why and how do ions form?
Answer and Explanation:
Ions are electrically charged particles that are formed from the removing and addition of electrons. It can be a positively or negatively charged atom.
A rain garden is a garden planted in a low-lying area where water tends to collect.
What benefit would rain gardens most likely provide for a community?
This image shows a...
Answer:
I think is the last one!!!! punnet square ⬜
What is the most basic level of biological organization?
Question 1 options:
Organism
Cell
Molecule
Atom
Answer:
molecule
Explanation:
Answer:
c
Explanation:
ssignment Vhat challenges would have existed in the spread of Christianity. pe overcome. Remember social media and cell phones did not exis R < previous
Answer:
A lot of people rejected it outright. Christians were persecuted and killed for their beliefs, and there were no cars, etc for easy transportation. Most people had to walk everywhere since horses and the like were only for the rich and royal. Hope this helps, please give me brainliest :)
Explanation:
Answer: Your not the best a spelling...
Explanation:
