Answer:
see explanation
Explanation:
How is the relatively high melting point of sodium chloride related to its structure at the atomic scale? Observe sodium chloride crystals with a hand lens. Use your observations and the model of sodium chloride to support your claim.
Unlike the raltively low melting point of water (100 °C), NaCl has a much higher melting point (801 °C),.
Theater molecules in ice are held together by hydrogen bonds, which are relatively weak.
The ions in NaCl are held together by ionic bonds, whose electrostatic ,force is much greater.
The crystal structure makes the force even greater.
imagine a chloride ionin a NaCl crystal.
It has Na ions in front, behind, to the left, to the right, above and below.
Likewise the Na ion has Cl ions in front, behind, to the left, to the right, above and below.
It takes a lot of energy to berak these bonds and temprature is a measure of energy.
if you try the experiment make certain you are undr a fune hood and wear protective loves and apron. 801 °C can seriously burn skin and clothing
The temperature at which the liquid and the solid of refined compounds and elements can occur stable and in equilibrium is called the melting point.
How are the structure and the melting point related?Water has a relatively lower melting point of 100 °C compared to [tex]\rm NaCl[/tex] at 801 °C which has a much higher melting point. The water molecules in ice are bonded jointly by somewhat weak hydrogen bonds.On the other hand, [tex]\rm NaCl[/tex] ions are bonded together by ionic bonds, that has a greater electrostatic force and its crystal structure produces the force to be even more prominent.When a sodium and chloride ion is imagined in the [tex]\rm NaCl[/tex] crystal the sodium ions are present above, below, left and right of the structure and the chloride ions are similarly placed in the crystal structure.This type of structure needs a lot of energy to break and hence the melting point of the salt is more compared to the water.
Therefore, the melting point is related to the structural organization of the atoms.
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10 What is a characteristic of all living organisms?
A breathing
Begestion
C
excretion
D ingestion
Answer:
D - ingestion
Explanation:
Carbon monoxide (CO), carbon dioxide (CO2) and nitrogen dioxide (NO2) are low molecular weight covalent compounds. Which of the following best describes the state in which these compounds exist at Standard Temperature and Pressure (STP)?
solid
liquid
gas
plasma
Answer:
gas
Explanation:
at Standard Temperature and Pressure Carbon monoxide (CO), carbon dioxide (CO2) and nitrogen dioxide (NO2) exist as gases
Option C is correct
Low molecular weight covalent compoundsCovalent compounds are compounds that are characterized by strong Intra-molecular bonds and they are solids as they have higher molecular weights
But when compounds like Carbon monoxide (CO), carbon dioxide (CO2), and nitrogen dioxide (NO2) are formed with low molecular weight covalent bonds They exist as gases
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what are the statement of ethanol
Answer:
Density 0.78945 g/cm3 (at 20 °C)
Melting point −114.14 ± 0.03 °C (−173.45 ± 0.05 °F; 159.01 ± 0.03 K)
Boiling point 78.23 ± 0.09 °C (172.81 ± 0.16 °F; 351.38 ± 0.09 K)
Solubility in water Miscible
Explanation:
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could you help answer these two question
Answer:
number 29 is D
Explanation: When the moon orbits the earth some of the light reflects off the moon, making it visible on the Earth.
I dont know how to answer 28 fully, is there a picture?
Why are being flammable and combustible considered to be chemical properties and not physical properties?
A. They alter its mass and volume
B. They change the state of matter
C. They change the substance into another substance
D. They change the color of the substance
Answer:
C. They change the substance into another substance.
Explanation:
Hope it helps!!
assuming that no heat is lost to the surroundings, what is the final temperature of the mixture?
What is the most common injury caused by working with machines unsafely?
Answer:
The most common injury caused by working with machinery are cuts and burns.
Explanation:
Cuts and burns are the most common injury caused by working with machines unsafely.
What is injury?Any physiological harm to living tissue brought on by acute physical stress is referred to as an injury. An injury can be brought on by a blunt trauma, a piercing trauma, burning, exposure to chemicals, asphyxiation, or overexertion, and it can also happen accidentally. Any area of the body can become injured, and each injury has a unique set of symptoms.
Major injuries are normally treated by a medical practitioner, and the type of treatment depends considerably on the injury. The most frequent reason for accidental human injury or injury-related death is traffic crashes. Chronic conditions are different from injuries. Cuts and burns are the most common injury caused by working with machines unsafely.
Therefore, Cuts and burns are the most common injury caused by working with machines unsafely.
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how many elements belong to the alkali metal family
Answer:
six
Explanation:
check your periodic table
rays with short wavelengths that are the least penetrating, produce chemical effects, and kill germs are
Answer:ultraviolet rays
Explanation:
SnO is a different compound than SnO2. What is the difference regarding the cation?
Answer:
Sn has a different charge in each of the compounds.
+2, +4 charges, respectively.
Explanation:
SnO has subscripts of 1, which means it takes only one of each element to make the compound.
We know that oxygen's charge is -2 from the periodic table.
In order for the compound to be neutrally charged,
Sn + O = 0
Sn - 2 = 0.
So, Sn has a +2 charge.
Likewise with the second compound, we know O has a -2 charge.
Sn + 2*(-2) = 0
Sn - 4 = 0
Sn = +4
+2 and +4 are different charges on the Sn cation.
how is a standard hydrogen atom different from a hydrogen ion?
Answer:
a hydrogen ion will have more or fewer electrons than a standard hydrogen atom.
Explanation:
ions are atoms that have lost or gained elections. this applies to ions in general.
mmmmmmmmmmmmmtyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
Answer:
Yes.
Explanation:
Answer:
=0=0==00=0=0=
Explanation:
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The temperature of a gas is increased. Which statement best explains the effect that this has on the motion of gas
particles?
Answer:
The average kinetic energy increases, and the particles collide more frequently.
Explanation:
Which item is a good example of potential energy?
A thrown baseball
O Electricity
O A rock
A battery
Explain why the invention of the microscope led to the discovery of cells.
Answer:
Because people can now see microscopic items
Explanation:
People can now see the cells because they are so small we cant see them with the enhanced microscope we can see everything that's micro
Ethanoic acid is a weak acid because
Is a carboxylic acid
Does not irritate the skin
Is not completely ionized in water
Produces one hydrogen ion per molecule
Answer:
is not completely ionized in water
The ethanoic acid (acetic acid) is considered as a weak acid because it does not releases all of its hydrogen in water, rather it dissociates partially and establishes an equilibrium with its conjugate base.
Which of the following is matter in its solid form?
O Air
O Electricity
O Rock
O Water
guys- my science teacher doesn't teach, he just says go on schoology
Where is a alcohol thermometer used?
Explanation:
Ethanol-filled thermometers are used in preference to mercury for meteorological measurements of minimum temperatures and can be used down to −70 °C (−94 °F). The physical limitation of the ability of a thermometer to measure low temperature is the freezing point of the liquid used.
What is the molarity of 6 moles (mol) of NaCl dissolved in 2 L of water?
O A.
2 mol
6L
ОВ.
6L
2 mol
O c.
6 mol
2L
O D.
2L
6 mol
Answer:
C: [tex]\frac{6 mol}{2 L}[/tex]
Explanation:
we can use the molarity equation
[tex]M = \frac{mol}{L}[/tex]
so to find M we plug in what we know, which is 6 moles of NaCl and 2 L of water, which gives us:
[tex]\frac{6 mol}{2 L}[/tex]
Answer:6 mol/2L
Explanation:just took the quiz
Heat is transferred from a fire to potatoes that are sitting on top of the coals.
Which type of heat transfer is occurring?
Answer: Is it Conduction?
Explanation:
tijuan mixed a solid and a liquid together in a beaker
Which definition bests describes an hydrogen bond?
(a) A bond between an highly electronegative element and hydrogen
b.A bond between two non-metals
c.A bond between a metal and a non-metal
d.A bond involving sharing of electrons
whats valency of nitrogen in N2O3, N2O5 and NO
Answer:
Valency of nitrogen in the given compounds:
N₂O₃ = +3
N₂O₅ = +5
NO = +2
-TheUnknownScientist 72
Where does the energy of a hurricane come from? (1 point)
O the Sun
O strong winds
O Earth's spin
O Earth's moon
Answer:
strong winds come from the energy of a hurricane
The energy of a hurricane come from strong wind. The Taino Native American term hurricane, which translates to "bad spirit of the wind," is where the word hurricane originates.
What is hurricane ?A tropical storm that has sustained winds of 74 mph or greater is referred regarded as a hurricane. A storm's eye typically measures 20 to 30 miles in width and can reach distances of 400 miles. Storms can be dangerous because of their torrential downpours, strong gusts, and storm surges.
When warm, humid air begins to rise over water, hurricanes emerge. Cooler air replaces the rising air. Large clouds and thunderstorms continue to grow as a result of this process. Thanks to the earth's Coriolis Effect, these thunderstorms are still expanding and starting to rotate.
Thus, option B is correct.
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what is the wavelength of radio waves that have a frequency of 3.20 x 1010 hz?
Answer:9.38 x 10^−3 m
Explanation:
Answer: 9.38 x 10^−3 m
Explanation:
the properties of a substance that can be observed without altering its identify physical property. true false ?
Answer:
True
Explanation:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points.
I need help with this
Answer:
129 units cubed
Explanation:
There are ten spaces between 120 and 130, so we can infer that each line represents a change in volume of 1 unit. The volume of the substance in the graduated cylinder looks like it's 1 under 130, so its volume is 129 units.
Hopefully this was helpful! :)
covalent bond of N and S
Answer:
Covalent bond between identical atoms
Covalent bonds occur between identical atoms or between different atoms whose difference in electronegativity is insufficient to allow transfer of electrons to form ions. ... The two hydrogen atoms are attracted to the same pair of electrons in the covalent bond.
What fraction of the original atoms of the radioactive sample will remain after the given number of half-lives has passed?
Answer:
1/8
Explanation:
[tex] \frac{1}{ {2}^{3} } = \frac{1}{8} [/tex]
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