Molecules and the moles can be interconverted into each other with the help of the Avogadro's number. In 8.5 x 10⁻² moles of hydrogen fluoride, there are 51.17 × 10²¹ molecules.
What is Avogadro's number?Avogadro's number is the special number that converts the moles into molecules and vice versa. The value of the Avogadro's number is 6.02 x 10²³.
If 1 mole of HF has 6.02 x 10²³ molecules then,
8.5 x 10⁻² moles of HF will have:
(8.5 x 10⁻²) × 6.02 x 10²³) = 51.17 × 10²¹
Therefore, 51.17 × 10²¹ molecules are present in HF.
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essay of poverty 500 words
Poverty is defined as a situation in which a family's fundamental necessities, such as food, housing, clothes, and education, are not met. It can lead to additional issues such as low literacy, unemployment, and starvation, among others. Due to a lack of funds, a poor individual is unable to obtain an education and hence remains unemployed. Unemployed people are unable to provide sufficient and healthy food for their families, and their health suffers as a result. A person who is weak lacks the necessary energy for the work. A unemployed individual would always be impoverished. As a result, we might claim that poverty is the basis of all other issues.
The United Nations has created two methods for evaluating poverty: absolute and relative poverty. In developing nations like India, absolute poverty is used to assess poverty. In industrialized countries like the United States, relative poverty is employed to quantify poverty. A poverty line has been established based on the minimum level of income in absolute poverty. If a family's daily income is less than this, they are poor or living in poverty. If a family's daily income exceeds this amount, it is considered non-poor or above the poverty line. The new poverty threshold in India is Rs 32 in rural areas and Rs 47 in cities.
"Poverty is not natural; it is manufactured," said Nobel Laureate and South African leader Nelson Mandela. The preceding remark is correct since most causes of poverty are caused by humans. Poverty has several causes, but the most significant is population growth. Countries' resources and budgets are being strained by rising population. Food, housing, and work are becoming increasingly difficult for governments to supply.
Lack of education, conflict, natural disasters, a lack of job, a lack of infrastructure, political instability, and so on are some of the other factors. For example, a person becomes jobless due to a lack of employment prospects and is unable to earn enough to meet his family's basic needs, resulting in poverty. Lack of knowledge forces a person to accept lower-paying occupations, making him poorer. Lack of infrastructure indicates that a country lacks industry, banks, and other institutions, resulting in a labor shortage. Natural calamities such as floods and earthquakes exacerbate poverty.
A protracted period of civil conflict in certain nations, particularly African ones like Somalia, has resulted in widespread poverty. This is because all of the resources and money are being diverted to the war effort rather than public welfare. Natural catastrophes, such as cyclones, are common in countries like India, Pakistan, and Bangladesh. Every year, these calamities occur, leading poverty to grow.
A poor family's life is affected by poverty. Poor people are unable to consume adequate food and nourishment, and their capacity to work is reduced. His income is further reduced by his reduced capacity to work, leaving him impoverished. Children from low-income families do not receive adequate education or nourishment. They must work in order to support their families, which ruins their childhood. Some of them may be involved in crimes such as theft, murder, and robbery, among others. A poor individual is illiterate and forced to live in slums in unsanitary conditions. In slums, there is no basic sanitation or drinking water, therefore he gets sick frequently and his health deteriorates. A disadvantaged individual is more likely to die young. As a result, all societal ills are linked to poverty.
The Indian government has also taken many steps to reduce poverty in the country. Some of these include establishing job opportunities, population control, and so on. In India, almost 60% of the population still relies on agriculture for a living. The Indian government has taken steps to boost agriculture. In our nation, the government built dams and canals to offer convenient access to water for irrigation. To support agriculture, the government has also made initiatives to make seeds and farming equipment more affordable. The government is also encouraging the cultivation of commercial crops such as cotton rather than food crops. The government is supporting manufacturing in cities in order to create more jobs. 'Ration stores' have also been established by the government.
Other initiatives include free and obligatory education for children up to the age of 14, scholarships for deserving students from low-income families, and subsidized housing for the poor.
Poverty is a societal ill, but we can help to combat it. For example, we may easily contribute old clothes to the needy, fund a poor child's education, or volunteer to educate impoverished pupils in our spare time. Before you throw food out, keep in mind that someone is still hungry.
An ion with a net charge of 2+ loses 5 electrons. What is its charge?
Answer:
+7
Explanation:
It will become MORE positive to + 7
2. An industrial process wastewater contains a mixture of metal fragments and sand. The metal fragments range in diameter from 0.5 to 10 mm with a specific gravity of 1.65. The sand particles range in diameter from 0.04 to 2.0 mm with a specific gravity of 2.65. The wastewater discharge rate is 1400 m3/d at 20°C. Design a settling tank to remove all the metal and sand particles. If the depth of the tank is 2 m, calculate the detention time. Solution Given
The detection time when an industrial process wastewater contains a mixture of metal fragments and sand is 1392.8 seconds.
How to calculate the detection time?From the information regarding the industrial process wastewater, the settling velocity for the sand particles will be:
= 9.81/[18(1.002 × 10^-6] × (2.65 - 1) × (0.04 × 10^-³)²
= 0.001435
Therefore, the detection time will be:
t = 2/0.001435
t = 1392.8 seconds.
The detection time is 1392.8 seconds.
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Please Help Me with this
Answer:
compared to sodium, silicon has a higher ionization energy meaning it takes more energy to remove electrons.
Explanation:
hope this helps
can u please give me and Brainlist
calculate the molarity of 500.0 mL of solution in which 50.0g of HCL has been dissolved
[tex]\huge\underline\mathcal{\red{A}\blue{n}\pink{s}\purple{w}\orange{e}\green{r} -}[/tex]
Given - 500 mL of solution containing 50g waterTo calculate - molarity of the solutionWe know that ,
[tex]Molarity \: (M) = \frac{no. \: of \: moles \: of \: solute }{volme \: of \: solution} \\[/tex]
it can be seen that we aren't provided with the no. of moles of solute in the question.
So let's calculate it using the given formula ~
[tex]no. \: of \: moles \: of \: solute = \frac{given \: mass}{molar \: mass} \\ \\ \longrightarrow \: \frac{50}{36.5} \\ \\ \longrightarrow \: 1.37 \: moles \: ( \: approx \: )[/tex]
Also ,
we're given that volume of solution = 500 mL = 0.5 L
Substituting the values in the formula of molarity , we get
[tex]Molarity = \frac{1.37}{0.5} \\ \\ \bold{\implies \: \boxed{Molarity = 2.74M}}[/tex]
hope helpful ~
The temperature of 2,000.0 g water is raised 3.00°C. How much
energy is transferred to the water. Use the formula below and use your
notes. The specific heat (Cp) for water is 4.18 J/g • °C. Round to three
significant digits. See your notes and slides.
Answer:
25 080 j ( Rounded to 25100 j)
Explanation:
FROM THE EQUATION
?? = 4.18 * 2000 * (3) = 25 080 j
it is said that what in the universe is made of either matter or energy
Answer:
normal matter, dark matter , dark energy
Chemistry equations are only used in a science lab, we don't use chemistry in everday life situations.
Please select the best answer from the choices provided
OT
OF
Answer:
False
Explanation:
Chemistry is always around us
How much heat does it take to warm 16.0 g of pure water from 90.0 degree C to 100.0 degree C?
The specific heat of water = 4.18 J/g. degree C
16.0 Joules
160 Joules
66.9 Joules
669 Joule
[tex]{\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}[/tex]
669 J
Right option is D.
Step by Step Explanation:
[tex] \sf Mass \: of \: water(m) = 16g \\ \\ \sf Specific \: heat \: of water(C) = 4.18J/g \\ \\ \sf Change \: in \: temperature ( \triangle T) = 100 - 90 = 10{ \degree}C[/tex]
[tex] \sf \large \red{ Heat = mC\triangle T}[/tex]Now substituting the required values.
[tex] \sf \hookrightarrow Heat = 16 \times 4.18 \times 10 \\ \\ \sf \hookrightarrow Heat = 668.8(approx) \\ \\ \blue {\boxed { \hookrightarrow{Heat = 669J }}}[/tex]
Which of the following best describes a weak acid?
A. It dissociates completely and produces OH- ions in water.
B. It only partially dissociates and produces H+ ions in water.
C. It dissociates completely and produces H+ ions in water.
D. It only partially dissociates and produces OH- ions in water.
Answer:
B.
Explanation:
weak acids - partially dissociate to give H+
strong acids - fully dissociate to give H+
Which of the following is the lowest temperature?
O 330 K
O 48°C
O 64°F
Which statement is correct for the element of proton number 19?
A It is a gas that dissolves in water
B It is a hard metal that is not very reactive with water
C It is a non-metal that burns quickly
D It is a soft metal that is highly reactive with water
Answer:
D
Explanation:
From periodic table : proton number 19 corresponds to K (potassium)
which is very reactive with water
What is the percent composition of Cesium and Fluorine in CsF?
The percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.
What is a percentage composition?Percent composition is very simple. Percent composition tells you by mass what percent of each element is present in a compound.
Molecular mass of Cs = 132.9054519
Molecular mass of F = 18.9984032
Molecular mass of CsF = 132.9054519 + 18.9984032 = 151.9038551
CsF: Percent composition by element:
Cesium (Cs) = [tex]\frac{32.9054519 X 100}{151.9038551}[/tex] = 87.493 %
Fluorine (F) = [tex]\frac{18.9984032 X 100 }{151.9038551}[/tex]= 12.507 %
Hence, the percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.
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PLEASE HELP!! 30 PTS
Identify the combination reaction.
1.) 2H 2 + O 2 ⟶ 2H 2O
2.) Cl 2 + 2KBr ⟶ 2KCl + Br 2
3.) Al 2S 3 ⟶ 2Al + 3S
4.) C 4H 12 + 7O 2 ⟶ 6H 2O + 4CO 2
Answer:
1.) 2H2 + O2=2H2O
2.)Cl2 + 2KBr= 2KCl + Br2
4.)C4H12 + 7O2= 6H2O + 4 CO2
How many significant figures
are in this number?
0.00521
The significant figures in the number 0.00521 is : 3 Significant figures.
Meaning of significant figuresSignificant figure can be defined as numbers within the number system that has value or gives value to a number list.
Significant figures are numbers that has a measure of value assigned to them as a reason of where they are placed.
In conclusion, the number above contains only three significant figures.
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where would you find water on the ph scale?
Answer: between 6.5 and 8.5
Explanation:
As shown in my science book it appears in the ph scale
HPO42- is an amphoteric ion. Is the Ka or Kb for this ion larger? (Hint: Consider
what its conjugate acid and conjugate base are in calculating the constants.)
Would you expect it to behave more like an acid or a base?
Sibce its Kb is larger than its Ka, the monohydrogen phosphate ion, HPO4^2- will behave more as a base than as an acid.
What is an amphoteric ion?An amphoteric ion is an ion that can act both as an acid or a base.
An example of an amphoteric ion is monohydrogen phosphate ion,
[tex]HPO_4^{2-}[/tex]
The Ka of monohydrogen phosphate ion is 4.8 × 10^-13 while the Kb is 1.6 × 10^-7.
The In is greater than the Ka.
Therefore, the monohydrogen phosphate ion, HPO4^2- will behave more as a base than an acid.
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Question 29 of 30
The thermochemical equation for the reaction of pentane and oxygen is
shown below. What does the equation tell you about the reaction?
C,H,(g)+80,(g) → 500,(g) + 6H2O(g) + 3536 kJ
O A. It is endothermic.
B. It has a low activation energy.
C. It has a high activation energy.
D. It is exothermic.
1. 24.76 grams of potassium carbonate (K2CO3) is reacted with an excess of aluminum nitrate (Al(NO3)3) to produce potassium nitrate (KNO3) and aluminum carbonate (Al2(CO3)3). How many grams of the product Al2(CO3)3 is formed? Round to the nearest hundredth.
Excess reagents are the chemical species that remain after the reaction completion. 14 gms of aluminum carbonate will be formed.
What are grams?Grams are the unit of the mass that is defined by the product of the moles and the molar mass of the substance.
The balanced chemical reaction is shown as:
3 K₂CO₃ + 2 Al(NO₃)₃ → Al₂(CO₃)₃ + 6 KNO₃
From the reaction, it can be said that 2 moles of aluminum nitrate are required to produce a mole of aluminum carbonate.
Moles of potassium carbonate are calculated as:
Moles = 24.76 gm ÷ 138.205 g/mol = 0.179 moles
If 3 moles of potassium carbonate produce 1 mole of aluminum carbonate, then 0.179 moles will produce 0.059 moles.
From the moles, mass is calculated as:
Mass = moles × molar mass
= 0.059 moles × 234.08 g/mol
= 13.97 gms
Therefore, 14 gms of aluminum carbonate will be formed.
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Which of the following best describes science?
A. The use of experiments and investigations to form opinions
B. The study of the natural world in order to formulate answers to
untestable questions
C. The use of observations and experiments to answer questions
about the natural world
D. The study of the universe to answer philosophical questions
Answer:
c
Explanation:
Science is best described as a way of building knowledge about the world around us through observation and experimentation.
Please answer this correctly!
A group of college students travel from Florida to Rome, Italy, on spring break. Which type of travel are they participating in?
A. Domestic
B. International
C. Local
D. Sustainable
Answer:
International is the answer duh
1. How many moles are in 78.9g of HCI?
a gas sample has a total pressure of 1.7atm. if the sample contains 2 gases and 1 gas has pressure of 0.7 atm, what is the pressure exerted by the other gas?
Answer:
1 atm
Explanation:
The other gas exerts the remaining pressure
1.7 - .7 = 1 atm
For each reaction below, use the drop-down menus to select which compound will form a precipitate. Note: It is possible that no precipitates form. Na2S + Cd(NO3)2 → CdS + 2NaNO3 FeCl3 + 3KOH → 3KCl + Fe(OH)3 Na2CO3 + Ba(NO3)2 → BaCO3 + 2NaNO3
Answer:
1. Cadmium sulfide
2. Iron (III) hrydroxide
3. Barium carbonate
Cadmium sulfide, iron hydroxide, and barium carbonate will form a precipitate.
What is Precipitation Reaction?The precipitation reaction can be described as a chemical reaction taking place in an aqueous solution where two ionic bonds combine in order to form an insoluble salt.
These insoluble salts form are called precipitates in precipitation reactions. Precipitation reactions are commonly double displacement reactions in which the production of a solid forms a residue known as the precipitate.
The first reaction: [tex]Na_2S + Cd(NO_3)_2 \longrightarrow CdS + 2NaNO_3[/tex]
The cadmium sulfide forms precipitates in this reaction.
The second reaction: [tex]FeCl_3 + 3KOH \longrightarrow 3KCl + Fe(OH)_3[/tex]
The iron hydroxide forms precipitate in this reaction.
The third reaction:[tex]Na_2CO_3 + Ba(NO_3)_2 \longrightarrow BaCO_3 + 2NaNO_3[/tex]
The barium carbonate forms precipitate in this reaction.
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contribution of chemistry in medicines
Answer:
Chemistry in Medicine
Explanation:
Major contributions to health care have been made by chemistry. The development of new drugs involves chemical analysis and synthesis of new compounds. Many recent television programs advertise the large number of new
drugs produced by chemists.
BRAINLIEST MEEEE PLSS
50 POINTS PLEASE ANSWER QUICK (bad answers will be reported)
22. A student claims that water's polarity is the reason it has high specific heat. What method could the student use to test his claim?
A. Perform research to see if other polar molecules have high specific heat.
B. Measure how much energy it takes to increase the temperature of water by one degree.
C. Mix water with acid and test the new specific heat.
D. Determine how dissolving salt in water affects the specific heat.
Answer:
B
Explanation:
specific heat capacity is the amount of Heat required to raise the temperature of a unit mass of substances by one degree
Need help with this chem question
Answer:
b its will shift left
c yes
What solution does ?
What is the molarity of a solution that has 450 grams of sodium chloride in 800.0 mL of
water?
Answer:
= 9.6125M
Explanation:
data:
volume = 800ml
800/ 1000 = 0.8dm^3
molar mass of NaCl = 23 + 35.5
= 58.5g
mass of NaCl = 450 g
moles= ?
molarity = ?
solution:
no. of moles = [tex]\frac{given mass}{molar mass}[/tex]
= 450 / 58.5
= 7.69 moles
now, molarity = [tex]\frac{moles}{volume in dm^3}[/tex]
= 7.69 / 0.8
molarity= 9.6125 M
What environment will produce the largest crystal sizes?
Construct a short Essay (Make sure you include information about Temp, Pressure, amount of dissolved solids, & cooling time)
Is there support for your Claim?
