How many significant figures
are in this number?
0.00521

Answer:

1. Cadmium sulfide

2. Iron (III) hrydroxide

3. Barium carbonate

Cadmium sulfide, iron hydroxide, and barium carbonate will form a precipitate.

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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The students can determine which of the solutions contains salt through the conductive tester.

It is a solution containing ions are atoms that have gained or lost electrons to acquire a positive (lost electron) or negative (gained electron) charge.

An ionic solution would be able to conduct electricity whereas the covalent would not so if you have a conductivity tester which is available in most labs.

The students can distinguish between the 2 solutions through the conductive tester.

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Mass of H_2SO_4 required

Molarity

So

Now molar mass of H_2SO_4

Mass

Answer:1950-200

Explanation:

During 1950-2000​ of the following 50-year intervals has the world's population increased the most. Hence, option D is correct.

The whole number of people or inhabitants in a country or region.

The world's population increased from 2.5 billion in 1950 to around 7.3 billion in 2015 and is expected to continue to rise until 2050/2100 under most UN.

During 1950-2000​ of the following 50-year intervals has the world's population increased the most. Hence, option D is correct.

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The percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.

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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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

Answer: between 6.5 and 8.5

Explanation:

As shown in my science book it appears in the ph scale

Answer:

rsghkm vumm

Explanation:

el correo de confirmación con la que se ha enviado desde correo ok recibido gracias saludos María del Ca

The name of the functional group that is attached to the following hydrocarbon is alcohol. Details about functional group can be found below.

A functional group in chemistry refers to a specific grouping of elements that is characteristic of a class of compounds, and determines their chemical properties.

According to this question, a hydrocarbon was given to possess the following formula:

CH3OH

This hydrocarbon is methanol and posseses an alcohol functional group (OH).

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What is the name of the functional group that is attached to this hydrocarbon?

                                                              H

                                                              │  

                                                      H ─ C  ─ OH

                                                              │

                                                              H

❌ A) alkyl halide

❌ C) carbonyl

❌ D) ketone

I Took Question Test And Nice Day.

Answer:

1 atm

Explanation:

The other gas exerts the remaining pressure

1.7 - .7 = 1 atm

Answer:

B.

Explanation:

weak acids - partially dissociate to give H+

strong acids - fully dissociate to give H+

Answer: 7.82999 g/cm³

Explanation:

1. Divide all of the lengths of the block by 10 to get them from mm to cm

2. Calculate volume of box

3. Calculate density using volume and mass

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.

Answer:

28L

Explanation:

V1 = 22L                             V2 = ?

T1 = 313K                            T2 = 273K

P1 = 1.5atm                          P2 = 1.0atm

Using the combined gas law equations;

[tex]\frac{P1V1}{T1}= \frac{P2V2}{T2}[/tex]

∴[tex]V2 = \frac{P1V1}{T1} * \frac{T2}{P2}[/tex]

         = [tex]\frac{1.5*22}{313} * (\frac{273}{1})[/tex]

   V2 = 28L

From the calculations and the statement of the general gas equation, the volume of the gas becomes 28.8 L

The gas laws are used to show the relationship between the variables in problems that has to do with gases.

In this case, we have to apply the general gas law as follows;

P1V1/T1 = P2V2/T2

P1V1T2 = P2V2T1

V2 =   * 22L *  1.5 atm * 273K/313K * 1 atm

V2 = 28.8 L

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Answer:

C. ribs.

Explanation:

The appendicular skeleton includes the shoulder girdles and arm bones, the pelvic gridle and the lower limb bones (leg bones). The ribs is part of the axial skeleton.

Excess reagents are the chemical species that remain after the reaction completion. 14 gms of aluminum carbonate will be formed.

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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Answer:

D

Explanation:

From periodic table : proton number 19  corresponds to K  (potassium)

  which is very reactive with water

The number of moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride is 0.544.

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

1 mole is 6.022 × 10²³

[tex]1\; molecule = \dfrac{1}{6.023 \times 10^2^3}[/tex]

The given number of moles are 1.64 x 10²³

[tex]1.64 \times 10^2^3= \dfrac{1}{6.023 \times 10^2^3} = 0.272 \\[/tex]

Now, there are two molecules of nitrogen in the dinitrogen trichloride

So, 0.272 x 2 = 0.544

Thus, the number of moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride is 0.544.

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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

Answer:

Liquid–liquid extraction

Explanation:

Sibce its Kb is larger than its Ka, the monohydrogen phosphate ion, HPO4^2- will behave more as a base than as an acid.

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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[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]

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]

The name of the compound is 2-methyl-3-ethylheptanoic acid.

Looking at the structure, the longest carbon chain is 7. Meaning that the compound is a heptanoic acid.

There are 2 branches. The first one has a single carbon (methyl) while the second one has 2 carbons (ethyl).

The methyl is located on the second carbon (2-methyl) while the ethyl is located on the third carbon (3-ethyl) on the main chain.

Thus, the name of the compound would be 2-methyl-3-ethylheptanoic acid.

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Answer:its c 3-ehtyl

Explanation:

Answer:

c

Explanation:

Science is best described as a way of building knowledge about the world around us through observation and experimentation.

Answer:

5.09 moles of Fe is required to react with 3.82 moles of O₂.

0.326 moles of O₂ are needed to produce 34.7 grams of Fe₂O₃.

Reaction stoichiometry

In first place, the balanced reaction is:

4 Fe + 3 O₂ → 2 Fe₂O₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Fe: 4 moles

O₂: 3 moles

Fe₂O₃: 2 moles

The molar mass of the compounds is:

Fe: 55.85 g/mole

O₂: 32 g/mole

Fe₂O₃: 159.7 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Fe: 4 moles ×55.85 g/mole= 223.4 grams

O₂: 3 moles ×32 g/mole= 96 grams

Fe₂O₃: 2 moles ×159.7 g/mole= 319.3 grams

Moles of Fe needed

The following rule of three can be applied: If by stoichiometry of the reaction 3 moles of O₂ react with 4 moles of Fe, 3.82 moles of O₂ react with how many moles of Fe?

moles of Fe= 5.09 moles

Finally, 5.09 moles of Fe is required to react with 3.82 moles of O₂.

Moles of O₂ needed

The following rules of three can be applied: If by reaction stoichiometry 319.3 grams of Fe₂O₃ are formed from 3 moles of O₂, 34.7 grams of Fe₂O₃ are formed from how many moles of O₂?

moles of O₂= 0.326 moles

Finally, 0.326 moles of O₂ are needed to produce 34.7 grams of Fe₂O₃.

Explanation: