YOU GET 20 POINTS AND BRAINLIEST
A mole is:
a A mammal known for digging up gardens.
b A small, dark spot on the skin.
c A spy embedded within an enemy government.
d 6.02 × 1023 particles of a substance.
e All of the above.

Answer:

Percent yield = 90.8%

Explanation:

The reaction of Fe with S to produce FeS is:

Fe + S → FeS

Where the moles of Fe added in excess of S are the moles of FeS

Now, percent yield is defined as 100 times the ratio between actual yield (13.8g of FeS) and theoretical yield (15.2g FeS):

Percent yield = 13.8g / 15.2g * 100

%yield = 91.8

Given

20 g NaCl

45 g AgCl

Required

%yield

Solution

Reaction

NaCl + AgNO₃ ⇒ AgCl + NaNO₃

mol NaCl :

= mass : MW

= 20 g : 58,44 g/mol

= 0.342

mol AgCl from equation :

= 1/1 x mol NaCl

= 1/1 x 0.342

= 0.342

Mass AgCl(theoretical) :

= mol x MW

= 0.342  x 143,32 g/mol

= 49.02 g

%yield = (actual/theoretical) x 100%

%yield = (45/49.02) x 100%

%yield = 91.8

The average atomic mass : 15.86

Given

205 atoms = 16 amu⇒atom 1

15 atoms = 14 amu⇒atom 2

Required

The average atomic mass

Solution

Total atoms for element Z :

= 205 + 15

= 220 atoms

% atom 1 = 205/220 x 100% = 93.18%

% atom 2 = 15/220 x 100% = 6.82%

The average atomic mass :

= 93.18% x 16 amu + 6.82% x 14 amu

= 14.9088 + 0.9548

= 15.8636≈ 15.86( 4 sig fig)

Hi,

Answer:

B. Energy is created each time it is transferred.

C.Molecules move faster in warmer substances.

D.Radiation requires a medium to transfer energy.

Answer:

physical change

a b c

chemical change

d

Answer:

At ambient pressure and temperature the isobaric specific heat, CP, of gaseous propane is 1.68 kJ/kg K or 0.402 Btu/lb °F = cal/g K, while the isochoric specific heat, CV, is 1.48 kJ/kg K or 0.353 Btu/lb °F = cal/g K.

Explanation:

Hope this helps

The answer should be d) 10, 12, 22

Answer:

Explanation:

Answer:

On the periodic table? But if you are talking about atomic NUMBER-then thats the number of protons on the upper left side of the symbol , but if you are talking about the mass then on the bottom left.

Since you are in highschool it shall always be provided hence no need to memorize it, just know the first 20

The atomic symbol for elements can be found on the periodic table.

The elements in the periodic table are arranged according to their rising atomic number and recurrent chemical characteristics. They are arranged in a tabular format with rows representing periods and columns representing groups.

The sequence of the elements' ascending atomic numbers is left to right and top to bottom. Thus, The valence electron configuration of elements belonging to the same group will be the same, resulting in identical chemical characteristics.

In contrast, valence electrons in the same period will be arranged in ascending order. As a result, there are more energy sub-levels per energy level as the atom's energy level rises. The very first 94 elements of a periodic table are found naturally, whereas the last 95–118 elements have only been created artificially in labs or nuclear reactors.

The periodic table we currently use is a more advanced version of certain models proposed by scientists in the 19th and 20th centuries. Based on the discoveries of those scientists who came before him, like John Newlands and Antoine-Laurent de Lavoisier, Dimitri Mendeleev proposed the periodic table. The periodic table was created by Mendeleev, who is the only person to receive credit for it.

Therefore, the atomic symbol for the elements can be found on the periodic table

Read more about the periodic table, here

https://brainly.com/question/11155928

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Answer:

Mass = 1.33 g

Explanation:

Given data:

Mass of argon required = ?

Volume of bulb = 0.745 L

Temperature and pressure = standard

Solution:

We will calculate the number of moles of argon first.

Formula:

PV = nRT

R = general gas constant = 0.0821 atm.L/mol.K

By putting values,

1 atm ×0.745 L = n × 0.0821 atm.L/mol.K× 273.15 K

0.745 atm. L = n × 22.43 atm.L/mol

n = 0.745 atm. L / 22.43 atm.L/mol

n = 0.0332 mol

Mass of argon:

Mass = number of moles × molar mass

Mass = 0.0332 mol × 39.95 g/mol

Mass = 1.33 g

Answer:

True is the answer to this question

Answer:

true, because your body need something to break down molecules... and that the job of an enzyme, hope this helps :))

Answer:

1)no

2)yes

Explanation:

Answer:

I guess yes it seems like a trick question

Explanation:

Answer:

I believe its oxygen gas  

Explanation: The density of a gas is 1.43 g/L

Answer:

avery

Explanation:

Answer:

avery is more faster.

Explanation:

reese's speed = 10/5 = 2km/hr

reese's speed = 10/5 = 2km/hravery's speed = 15/5 = 3km/hr

reese's speed = 10/5 = 2km/hravery's speed = 15/5 = 3km/hrby seeing their speeds we can easily tell that avery is more faster than reese ...

Answer:

A. Minerals

Explanation:

Anything that is abiotic in nature is something that isn't living. Fungi is alive, so are dogs and ants.

Answer: Minerals is the correct answer.

Explanation: Sunlight, air, precipitation, minerals, and soil are some examples of abiotic factors. These factors have a significant impact on the survival and reproduction of species in an ecosystem. Answer is confirmed correct on the test. I hope this helps! Thanks!

Answer: An applied force of 50 N is used to accelerate an object to the right across. A 5-kg object is sliding to the right and encountering a friction force that slows it down. Explanation: m=1000 kg and a=3m/s2 . hence, the force needed to accelerate the 1000kg car by 3m/s2 is 3000N

Explanation: PLEASE MARK  ME AS BRAINLIEST

Answer:

The mole and Avogadro’s number are two important concepts of science that provide a link between the properties of individual atoms or molecules and the properties of bulk matter. It is clear that an early theorist of the idea of these two concepts was Avogadro. However, the research literature shows that there is a controversy about the subjects of when and by whom the mole concept was first introduced into science and when and by whom Avogadro’s number was first calculated. Based on this point, the following five matters are taken into consideration in this paper. First, in order to base the subject matter on a strong ground, the historical development of understanding the particulate nature of matter is presented. Second, in 1811, Amedeo Avogadro built the theoretical foundations of the mole concept and the number 6.022 × 1023 mol−1. Third, in 1865, Johann Josef Loschmidt first estimated the number of molecules in a cubic centimetre of a gas under normal conditions as 1.83 × 1018. Fourth, in 1881, August Horstmann first introduced the concept of gram-molecular weight in the sense of today’s mole concept into chemistry and, in 1900, Wilhelm Ostwald first used the term mole instead of the term ‘gram-molecular weight’. Lastly, in 1889, Károly Than first determined the gram-molecular volume of gases under normal conditions as 22,330 cm3. Accordingly, the first value for Avogadro’s number in science history should be 4.09 × 1022 molecules/gram-molecular weight, which is calculated by multiplying Loschmidt’s 1.83 × 1018 molecules/cm3 by Than’s 22,330 cm3/gram-molecular weight. Hence, Avogadro is the originator of the ideas of the mole and the number 6.022 × 1023 mol−1, Horstmann first introduced the mole concept into science/chemistry, and Loschmidt and Than are the scientists who first calculated Avogadro’s number. However, in the science research literature, it is widely expressed that the mole concept was first introduced into chemistry by Ostwald in 1900 and that Avogadro’s number was first calculated by Jean Baptiste Perrin in 1908. As a result, in this study, it is particularly emphasised that Horstmann first introduced the mole concept into science/chemistry and the first value of Avogadro’s number in the history of science was 4.09 × 1022 molecules/gram-molecular weight and Loschmidt and Than together first calculated this number.

#CARRY ON LEARNING HOPE IT HELPS

#PLEAS GIVE ME A BRAINLIEST ANSWER FOR

MY APRICIATING WORK

Answer:

12.8 grams

Explanation:

Answer:

1. mechanical energy

The sum of an objects kinetic

energy and potential energy

2. mechanics

The analysis of bodies in motion

3. kinetic energy

The energy of a moving object

4. potential energy

Stored energy

5. gravitational potential energy

Energy of an object due to its

position above the earth

6. force

A push or a pull

Explanation:

Answer:

1. mechanical energy

The sum of an objects kinetic

energy and potential energy

2. mechanics

The analysis of bodies in motion

3. kinetic energy

The energy of a moving object

4. potential energy

Stored energy

5. gravitational potential energy

Energy of an object due to its

position above the earth

6. force

A push or a pull

Explanation:

Answer:

Double replacement:

Explanation:

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AD +CB

Chemical equation:

CaCO₃ + 2HCl    →      CaCl₂ + H₂CO₃

The given chemical reaction is example of double displacement reaction. In this type of reaction cation and anion of both reactant exchange with each other. We can see carbonate ion of calcium carbonate combine with hydrogen ion of HCl and form carbonic acid while chloride ions of HCl combine with calcium ion and form calcium chloride.

All other options are incorrect because,

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

Combustion reaction:

In combustion reaction substances are burned in the presence of oxygen.

Answer:

double-displacement

Explanation:

I took the test :)

Answer:

Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals clays and soluble salts. These reactions occur particularly when the water is slightly acidic.

Explanation:

Answer:

The Standard Model of particle physics is the theory describing three of the four known fundamental forces (the electromagnetic, weak, and strong interactions, and not including the gravitational force) in the universe, as well as classifying all known elementary particles. It was developed in stages throughout the latter half of the 20th century, through the work of many scientists around the world, with the current formulation being finalized in the mid-1970s upon experimental confirmation of the existence of quarks.

Answer:

practice physical

Explanation:

The Standard Model of particle physics is the theory describing three of the four known fundamental forces in the universe, as well as classifying all known elementary particles.

Answer:

since the moisture in the bottle from the water collects smoke particles which form into clouds

Explanation:

Answer: In other words, mitochondria

Explanation: