How many grams of rubidium are in 2.39 x 10^24 atoms of rubidium?

Answer:

compared to sodium, silicon has a higher ionization energy meaning it takes more energy to remove electrons.

Explanation:

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can u please give me and Brainlist

Answer:

B.

Explanation:

weak acids - partially dissociate to give H+

strong acids - fully dissociate to give H+

Answer:

1.) 2H2 + O2=2H2O

2.)Cl2 + 2KBr= 2KCl + Br2

4.)C4H12 + 7O2= 6H2O + 4 CO2

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We 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 ~

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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Answer:

c

Explanation:

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

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:

= 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:

False

Explanation:

Chemistry is always around us

Answer:

+7

Explanation:

It will become MORE positive   to  + 7

The detection time when an industrial process wastewater contains a mixture of metal fragments and sand is 1392.8 seconds.

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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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: between 6.5 and 8.5

Explanation:

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

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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]

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

Answer:

The nuclear composition of uranium-235 is 92 protons and 143 neutrons.

Answer:

D

Explanation:

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

  which is very reactive with water

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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The significant figures in the number 0.00521 is : 3 Significant figures.

Significant 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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Answer:

International is the answer duh

Answer:

1 atm

Explanation:

The other gas exerts the remaining pressure

1.7 - .7 = 1 atm

Answer:

b its will shift left

c yes

Answer:

25 080 j    ( Rounded to 25100 j)

Explanation:

 FROM THE EQUATION

??  = 4.18  * 2000 * (3)  = 25 080 j

Answer:

normal matter, dark matter , dark energy

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.