Please help please help
Answer:
The mass percentage of chlorine is 60.66 % chlorine in the compound sodium chloride.
Explanation:
What is ozone hole?
What causes an ozone hole?
Answer:
Ozon prevents us from UV rays of the sun. Ozone hole means that UV rays are entering the Earth. This results in cancer.
Explanation:
Chlorofluorocarbons are causing this
Answer:
The term ‘ozone hole’ refers to the depletion of the protective ozone layer in the upper atmosphere (stratosphere) over Earth's polar regions. People, plants, and animals living under the ozone hole are harmed by the solar radiation now reaching the Earth's surface—where it causes health problems, from eye damage to skin cancer.
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.
The below table compares the number of electrons in two neutral atoms.
atom:
Ne 10
Na 11
Compare the electron configuration and atomic radius of these two atoms and use that to explain the difference in their reactivity.
The only two elements in alkenes and alkynes are A. Carbon and Nitrogen B. Carbon and Hydrogen C. Oxygen and Nitrogen D. Oxygen and Hydrogen
Answer:
B. Carbon and Hydrogen
Explanation:
An alkyne can be regarded as unsaturated hydrocarbon which have at least one carbon—carbon triple bond. They are acyclic aliphatic hydrocarbons, they can be (branched or unbranched) , They have general chemical formula of [ CₙH₂ₙ−2]. One of the compound belonging to this family is Propyne( C3H4) Hence, they contain Hydrogen and Carbon.
Alkenes can be regarded as class of hydrocarbons which posses only carbon and hydrogen, they are unsaturated compounds having least one carbon-to-carbon double bond.
alkenes can also be regarded as "olefins". one of the members of this family is Ethene (C2H4). general formula of alkenes can be written as [C nH 2n],
n=number of carbon atoms present in the molecule
What is the basic idea for how to find surface area of any solid?
Answer:
Find the area of each face that you see and then multiply each area by two to account for the face on the opposite side.
Which were Lenin's actions before and during the Russian Revolution? Check all that apply.
He led the fight against Germany
He supported the ideology of Marxism
He opposed the provisional government.
He opposed the tsar and was exiled.
He supported the Duma.
He led the Bolsheviks.
He supported inequality.
The correct answe is:
• He supported the ideology of Marxism.
• He opposed the provisional government.
• He opposed the trar and was. exiled.
• He led the Bolvsheviks.
Answer:
He supported the ideology of Marxism.
He opposed the tsar and was exiled.
He led the Bolsheviks.
Explanation:
Lenin was Russian Revolution political theorist. He served as first founding head of government of Soviet Russia. He supported the ideology of Marxism and opposed Tsar.
The solution of sugar at 60.0 degrees celcuis is 290.0 g/ 100 g water. If you add 100.0 g of sugar to 25 g of water at 60.0 degrees celcuis will the sugar dissolve?
Answer:
you will produce a saturated solution, At 0 degrees Celsius, sugar is claimed to dissolve 180 grams in 100 grams of water. This means that if you dissolve that much sugar in 100 g of water, you'll get a saturated solution.
Explanation:
The correct answer for the given question about Saturated solution is only 72.5 gram will get dissolved and rest which is 27.5 gram will remain undissolved.
How to apply concept of Saturated solution to solve this question?In question it is given that at 60° C 290 gram of sugar in 100 gram of water produce saturated solution.
So at 60° C 290/100 gram of sugar in 1 gram of water will produce saturated solution.
Hence we can say that at 60° C (290/100)×25 gram of sugar in 25 gram of water will produce saturated solution.
means at 60° C 72.5 gram of sugar in 25 gram of water will produce saturated solution.
Now, adding 100 gram of sugar in 25 gram of water.
Since you can only hope to dissolve 72.5 gram at 60°,
Hence the resulting solution will contain undissolved sugar.
So only 72.5 gram will get dissolved and rest which is 27.5 gram will remain undissolved.
Thus, We can conclude that Only 72.5 grams of sugar will dissolve, leaving the remaining sugar of 27.5 grams undissolved.
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calculate the oxidation number of the central atom of FeSO4 7H2O
Answer:
[tex]{ \tt{let \: the \: oxidation \: state \: be \: x}} \\ { \bf{x + sulphate \: ion+ water = overall \: charge}} \\ \\ \\ { \tt{x + ( - 2) + 0 = 0}} \\ \\ { \tt{x = + 2}} \\ { \tt{oxidation \: state = + 2}}[/tex]
Using the periodic table, choose the more reactive nonmetal.
Te or O
the answer is Te because O is oxygen.
Answer:
O
Explanation:
this is because it is oxygen
Can somebody help please to balance those I couldn’t balance it
Answer:
1.
(NH4)2Cr2O7——>Cr2O7+N2+4H2O
2.
6CO2+6H2O——>C6H12O6+6O2
What would happen to the entropy in the reaction 203(9) ► 302(g)?
Answer:
Enthalpy and entropy. ... What would happen to the entropy in the reaction 2O3(g) 3O2(g)? It increases
What would happen to the entropy in the reaction 2O3(g) --> 3O2(g)?
It increases.
which of the acyclic hydrocarbon series is represented by CnH2n
Answer:
alkenes
Explanation:
The general formula for alkenes is CnH2n
WHAT IS THE DIFFERENCE BETWEEN HALF CELL REACTION AND FULL CELL REACTION
Answer:
It is the amount of energy needed to move an electric charge across a cell
Explanation:
Thank you so much !!!!!!!!!!!!!!!What is ΔH if 5.5 grams H₂O(l) is formed from this reaction? ( molar mass of H₂O = 18)
H₂(g) + ½ O₂(g) → H₂O(l) ∆H = -285.8 kJ
Answer:
–87.3 KJ.
Explanation:
The equation for the reaction is given below:
H₂(g) + ½O₂(g) —> H₂O(l) ∆H = -285.8 kJ
Next, we shall determine the mass of H₂O produced from the balanced equation. This can be obtained as follow:
Molar mass of H₂O = 18 g/mol
Mass of H₂O from the balanced equation = 1 × 18 = 18 g
SUMMARY:
From the balanced equation above,
When 18 g of H₂O was produced, ∆H was –285.8 KJ.
Finally, we shall determine ∆H when 5.5 g of H₂O is produced. This can be obtained as illustrated below:
From the balanced equation above,
When 18 g of H₂O was produced, ∆H was –285.8 KJ.
Therefore, 5.5 g of H₂O will produce ∆H of = (5.5 × –285.8) / 18 = –87.3 KJ
Thus, the ∆H when 5.5 g of H₂O was produced is –87.3 KJ.
Help please and thank you
When 27.50 liters of oxygen gas reacts with excess hydrogen gas at STP how many grams of water is produced?
Answer: The mass of water produced is 44.28 g
Explanation:
We are given:
Volume of oxygen gas = 27.50 L
At STP conditions:
22.4 L of volume is occupied by 1 mole of a substance
27.50 L of oxygen gas will be occupied by = [tex]\frac{1mol}{22.4L}\times 27.50L=1.23mol[/tex]
The chemical equation for the formation of water follows:
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
By the stoichiometry of the reaction:
If 1 mole of oxygen gas produces 2 moles of water
So, 1.23 moles of oxygen gas will produce = [tex]\frac{2}{1}\times 1.23=2.46mol[/tex] of water
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Molar mass of water = 18 g/mol
Plugging values in equation 1:
[tex]\text{Mass of water}=(2.46mol\times 18g/mol)=44.28g[/tex]
Hence, the mass of water produced is 44.28 g
what is the mass of alumunium will be completly oxidized by 44.8 L of oxygen to produce Al2o3 at STP?
Answer:
Therefore, 2 moles of oxygen will be required to oxidize 2.66 moles of oxygen. 72g of Aluminium will be completely oxidized by 44.8 lit of oxygen at STP.
what mass of small stones would be needed to make the strongest concrete? give a reason for your awnser.
Answer:
For a good consert mix aggregate needed to the clean hard strong partical free of absorb chemicals or coating clay and other fine materials
Can metals have covalent radius and van der Waal's radius instead of metallic radius?
Explanation:
Whether you choose to use van der Waals radii or metallic radii as a measure of the atomic radius, for metals the ionic radius is smaller than either, so the problem doesn't exist to the same extent. It is true that the ionic radius of a metal is less than its atomic radius (however vague you are about defining this).
Whether you choose to use van der Waals radii or metallic radii as a measure of the atomic radius, for metals the ionic radius is smaller than either, so the problem doesn’t exist to the same extent. It is true that the ionic radius of a metal is less than its atomic radius (however vague you are about defining this).
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What is the product of
Mg(NO3)2 + Na2CO3?
Answer:
MgCO3 + 2 NaNO3
Explanation:
please help in all 3 questionnn
Answer:
Explanation:
a) photosynthesis
b) Substances used: water, sun, gas and nutrients. Products: glucose and flowers
c) there will be no sunlight or no open environment
Place the following in increasing atomic radius:
Least to most
Explanation:
least= Li,F,N,He,Ca,O
medium=N,Br,K,Ne,Zn,Fr
most= F,I,K,Kr,Br,Ga
Household ammonia has a pH of 12; household bleach has a pH of 13. Which of the following statements about these substances is true? Group of answer choices The ammonia has 10 times as many OH- ions as the bleach. The ammonia has 10 times as many H+ ions as the bleach. A solution that could buffer the bleach and ammonia would remove excess OH- ions. Both of these substances are strong acids.
Answer:
The ammonia has 10 times as many H+ ions as the bleach.
Explanation:
pH is defined as -log[H+]
[H+] of ammonia is = 10^-12 = 1x10-12M
Bleach = 1x10-13M
pOH = 14-pH = 2 for ammonia and 1 for bleach
[OH-] = 10^-pOH = 0.01M for ammonia and 0.1M for bleach
Thus:
The ammonia has 10 times as many OH- ions as the bleach. FALSE.
The ammonia has 10 times as many H+ ions as the bleach. TRUE.
A solution that could buffer the bleach and ammonia would remove excess OH- ions. FALSE. A buffer maintains OH- ion concentration
Both of these substances are strong acids. FALSE. Strong acids have pHs < 7
Charles's law is a gas law relates volume to temperature. The law is named after (1) _____________________, who was a French inventor and scientist. He found through his experiment the volume of a gas increases linearly with an increase in the (2) _____________________. Shrinking of an inflated balloon and a bicycle tire in a very low temperature show the decrease of (3) ______________ which explains that the relationship of volume and temperature is directly related at constant (4) ______________. For a given sample of gas under two different conditions at a constant pressure, the equation can be written as (5) ________________________.
Answer:
1. Jacques Charles
2. Temperature
3. Volume
4. Pressure
5. [tex] \frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
Explanation:
Jacques Alexandre-César Charles was a French mathematician, scientist, inventor, balloonist, aeronaut, and physicist who was born on the 12th of November, 1746 in Beaugency, France and died on the 7th of April, 1823 in Paris, France. He was famously known for his invention of the first hydrogen balloon in 1783 and the discovery of Charles Law.
Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.
Mathematically, Charles' law is given by the formula;
[tex] VT = K[/tex]
[tex] \frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
Where;
V1 and V2 represents the initial and final volumes respectively.T1 and T2 represents the initial and final temperatures respectively.ii) Distinguish between temporary and permanent hard water?
Explanation:
temporary water is call carbonate hardness
parmanent water is call non-carbonate hardness
Temporary hardness is caused by the presence of dissolved bicarbonates of calcium, magnesium, and other heavy metals and the bicarbonates of iron.,The salts responsible for temporary hardness are Ca(HCO3)2 , Mg(HCO3)2
Permanent hardness It is due to presence of dissolved chlorides and sulphates of calcium, magnesium, iron and other heavy metals
is radiation beneficial or harmful to society explain why
Answer:
Radiation isn't beneficial to society .Radiation damages the cells that make up the human body. Low levels of radiation are not dangerous, but medium levels can lead to sickness, headaches, vomiting and a fever. High levels can kill you by causing damage to your internal organs. It's difficult to treat high radiation exposure.
Explanation:
Exposure to very high levels of radiation, such as being close to an atomic blast, can cause acute health effects such as skin burns and acute radiation syndrome (“radiation sickness"). It can also result in long-term health effects such as cancer and cardiovascular disease.
Radiation is both harmful and beneficial, but when we analyse it is found that harms overweight benefits. Radiation can be used as a form of energy (in nuclear plants), but an accident or malfunction in it can lead to death and injury of humans. Also, it is really difficult to dispose the used devices.
The nth shell holds a minimum number of 2n2 electrons
True
False
Other:
Answer: The statement the [tex]n^{th}[/tex] shell holds a minimum number of [tex]2n^{2}[/tex] electrons is true.
Explanation:
The alphabet 'n' denotes the principal quantum number whose value can be equal to 1, 2, 3, and so on but can never be zero.
Basically, 'n' is the number of shell of an atom and total number of orbitals present in a shell is [tex]n^{2}[/tex].
Each orbital can hold up to a maximum of wo electrons. Hence, the [tex]n^{th}[/tex] shell can hold a minimum number of [tex]2n^{2}[/tex] electrons.
Thus, we ca conclude that the statement the [tex]n^{th}[/tex] shell holds a minimum number of [tex]2n^{2}[/tex] electrons is true.
A molecule has four bonded atoms around a central atom. The central atom does not have any lone pairs of electrons. What is the geometry of the molecule?
Answer:
Tetrahedral. Tetra- signifies four, and -hedral relates to a face of a solid; “tetrahedral” literally means “having four faces. ” This shape is found when there are four bonds all on one central atom, with no lone electron pairs. In accordance with the VSEPR theory, the bond angles between the electron bonds are 109.5o ...
There are two characteristics of molecules, one is geometry and other is shape. Shape is excluding lone pair surrounding the central element and geometry is including the lone pair. Therefore, the geometry of given molecule is tetrahedral.
What is VSEPR theory?
VSEPR stands for valence shell electron pair repulsions. VSEPR theory is used to predict the shape and geometry of molecules on the basis of valence electrons pairs that are present around the central element of the molecule.
According to VSEPR theory, Lone pair lone pair repulsion is greater than bond pair bond pair repulsion. There are so many limitations of VSEPR theory. There is a repulsion between bond pair electrons and lone pairs present on the central element.
A molecule has four bonded atoms around a central atom. The central atom does not have any lone pairs of electrons. The geometry of such molecule is Tetrahedral. Geometry does not include lone pair on central atom.
Therefore, the geometry of given molecule is tetrahedral.
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2 A certain gas of 25 g at 25°c and 0.65 atm occupies a volume of 23.52L Determine the molecule mass of the gas.
Answer:
[tex]{ \bf{PV= \frac{m}{M} RT}} \\ \\ { \tt{(0.65 \times 23.52) = \frac{25}{M} \times 0.081 \times (25 + 273)}} \\ \\ M = 39.5 \: g[/tex]
A warm air moist air mass moves over a cold air mass is most likely to lead to which type of server weather