What is the common name of this chemical family

The granite block transferred 4080 J of energy, and the mass of the water is 35.8 g.

1. Energy from granite block

The formula for the heat (q) transferred is

q = mCΔT

m = 126.1 g; C = 0.795 J·°C⁻¹g⁻¹; ΔT = T_f – T_i = 51.9 °C - 92.6 °C = -40.7 °C

∴ q = 126.1 g × 0.795 J·°C⁻¹g⁻¹ × (-40.7 °C) = -4080 J

The granite block transferred 4080 J.

2. Mass of water

q = mCΔT

m = q/(CΔT)

q = 4080 J; C = 4.186 J·°C⁻¹g⁻¹; ΔT = T_f – T_i = 51.9 °C – 24.7 °C = 27.2 °C

∴ m = 4080 J/(4.186 J·°C⁻¹g⁻¹ × 27.2 °C) = 35.8 g

The mass of the water is 35.8 g.

The granite block transferred 4,080 joules of energy, and the mass of the water is 35.8 grams.

Heat transfer in any system can be calculated as follow:

q = mCΔT

Heat transfer by the granite block is calculated as follow:

q = mCΔT, where

m = mass of granite = 126.1 g (given)

C = specific heat of granite = 0.795 joules/gram degree Celsius (given)

ΔT = change in temperature of granite = 51.9 °C - 92.6 °C = -40.7 °C (given)

Putting all these values in the above equation, we get

q = 126.1 × 0.795 × -40.7 = -4080 J

Now by using the above formula, we can also calculate the mass of water in the following way:

m = q / CΔT, where

C = specific heat of water = 4.186 joules/gram degree Celsius (given)

ΔT = change in temperature of water = 51.9 °C – 24.7 °C = 27.2 °C

Putting all these values in the above equation, we get

m = -4080 /  4.186 × 27.2 = 35.8 g.

Hence, 4,080 joules of energy is transferred by granite block and 35.8 g is the mass of water.

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Answer:

both drop downs are 1000

Explanation:

According to the law of conservation of energy, 1000 kilojoules of electric energy are transformed into  1000 kilojoules of kinetic energy.

According to law of conservation of energy , it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer  in the year 1812.

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Answer - A. an agricultural system

Explanation - Anything that has two or more parts working together is a type of system. Some systems, such as toothbrushes, are very simple because they only have a few parts. Other systems, such as farms, can be very complex because they have hundreds of different parts.  The components of a system play different roles in the system.

Plus study island:D

Final answer:

Seeds, soil, a plow, and a large field are part of an agricultural system, which relates to the cultivation and management of crops, unlike an organ system that pertains to biological organisms.(Option A)

Explanation:

Seeds, soil, a plow, and a large field are components that are interconnected to create a specific outcome, which in this case is agricultural production. Therefore, these elements are part of an agricultural system. This system involves the cultivation and management of crops or livestock, and includes a variety of processes and resources to sustain and enhance the production cycle.

It is distinctly different from an organ system, which pertains to biological organisms and consists of organs working together to perform complex functions. Organ systems are found in both animals and plants, with animals having systems like the digestive or skeletal system, and plants having shoot and root systems.

C. A compound !hope this helps!

Im pretty sure the answer is C. a compound

Hey There!

let see the definition of law of multiple proportions  when two eliments combine to form more than one compound  the mass of one element which combine with mass of other element is will always be a fixed ratio  ,accordingly answer is first option.

Answer A : N2O  , NO , NO2

Option A, N2O, NO, and NO2, are compounds that illustrate the law of multiple proportions, which states that when two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other are in a ratio of small whole numbers.

The set of compounds illustrating the law of multiple proportions is option A: N2O, NO, NO2. The law of multiple proportions, a basic principle of Chemistry, states that when two elements combine to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers. The compounds N2O, NO, and NO2 are all made up from Nitrogen and Oxygen, but in different ratios of whole numbers, thereby demonstrating this law. Nitrogen monoxide (NO) and Nitrogen dioxide (NO2), for example, both consist of nitrogen and oxygen, but the ratio of oxygen atoms per nitrogen atom in each compound is a simple integer ratio: 1:1 in NO, 2:1 in NO2.

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A chemical property of iron is its ability to combine with oxygen to form iron oxide, commonly known as rust; this process is known as corrosion. Therefore, the correct answer is that iron combines readily with oxygen "C".

The question asks about the chemical property of iron. Chemical properties describe the ability of a substance to undergo a specific chemical change. For iron, a key chemical property is its capability to combine with oxygen to form iron oxide, commonly known as rust. This process is part of a broader category of chemical changes known as corrosion. Unlike physical properties, which can be observed without changing the substance, chemical properties can only be seen as the substance is transformed into a different substance. Therefore, the correct answer to the question is C) Iron combines readily with oxygen.

Making lemonade is a chemical change because once the ingredients are mixed together they cannot be seperated.

Making lemonade is a chemical change.

In a physical change, the composition of the substance does not change. For example, if you melt a piece of ice, the ice changes from a solid to a liquid, but the water molecules that make up the ice are still the same.

In a chemical change, the composition of the substance does change. For example, when you make lemonade, you are combining sugar, lemon juice, and water to create a new substance with different properties. The sugar and lemon juice molecules react with each other to form new molecules of sucrose and citric acid.

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Hey there!

Values Ka1 and Ka2 :

Ka1 => 8.0*10⁻⁵

Ka2 => 1.6*10⁻¹²

H2A + H2O -------> H3O⁺  + HA⁻

 Ka2 is very less so I am not considering that dissociation.

Now Ka = 8.0*10⁻⁵ = [H3O⁺] [HA⁻] / [H2A]

lets concentration of H3O⁺  = X then above equation will be

8.0*10−5 = [x] [x] / [0.28 -x

8.0*10−5 = x² /  [0.28 -x ]

x² + 8.0*10⁻⁵x  - 2.24 * 10⁻⁵

solve the quardratic equation

X =0.004693 M

pH = -log[H⁺]

pH = - log [ 0.004693 ]

pH = 2.3285

Hope that helps!

The total number of atoms in 0.290g of P2O5 is approximately 8.6 x 10^22.

To find the total number of atoms in 0.290 g of P2O5, we need to first calculate the number of moles in the given mass. The molecular weight of P2O5 (Phosphorous pentoxide) is approximately 141.94 g/mol (2(30.97 g/mol for P) + 5(16.00 g/mol for O)). This allows us to calculate the moles: 0.290 g / 141.94 g/mol = 0.00204 mol of P2O5.

Since each molecule of P2O5 contains 7 atoms (2 P atoms and 5 O atoms), the number of atoms in one mole will be 7 x Avogadro's number (6.022 x 10^23). Therefore, for 0.00204 mol of P2O5, the total number of atoms will be 0.00204 mol  x 7 x 6.022 x 10^23 = 8.6 x10^22 atoms.

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Final answer:

The law of conservation of mass implies that the mass remains constant in closed systems, during both physical and chemical changes. Therefore, when 18 mL of liquid water vaporizes to 22 L of water vapor, the mass remains unchanged despite the change in volume.

Explanation:

Law of Conservation of Mass

The law of conservation of mass states that the mass of a closed system must remain constant over time, as system mass cannot change quantity if it is not added or removed. During physical and chemical changes, matter can change form, such as from a liquid to a gas, but the mass of the system remains the same. This means that if 18 mL of liquid water vaporizes to form about 22 L of water vapor, the mass of the water vapor will still be equal to the mass of the liquid water prior to vaporization.

Example of Conservation of Mass

In the example provided, when water is heated and changes from a liquid to a gas, it expands greatly in volume, but the total mass remains unchanged. Although 18 mL of water becomes 22 L of water vapor, this physical change does not result in a loss or gain of mass. This illustrates that during vaporization, a physical change, the law of conservation of mass is obeyed.

The mass of the water remains constant at 18 grams before and after vaporization, in accordance with the law of conservation of mass.

The law of conservation of mass states that mass cannot be created or destroyed in an isolated system during a physical or chemical change. This means that the total mass of the reactants in a chemical reaction must equal the total mass of the products. Similarly, when a physical change occurs, such as a change of state, the mass remains constant.

In the given scenario, 18 mL of liquid water vaporizes to form approximately 22 L of water vapor. To apply the law of conservation of mass, we need to consider the mass of the water before and after vaporization, not the volume. The density of water is approximately 1 gram per milliliter, so 18 mL of liquid water has a mass of about 18 grams.

When water vaporizes, it undergoes a phase change from liquid to gas, expanding in volume as it becomes less dense. However, the number of water molecules does not change during this process, and since mass is a measure of the amount of matter, the mass of the water vapor will be the same as the mass of the original liquid water.

Therefore, even though the volume of the water changes dramatically from 18 mL to 22 L, the mass of the water remains constant at 18 grams, in accordance with the law of conservation of mass. The volume increase is due to the water molecules spreading out to fill the available space as a gas, but the total mass of the water molecules themselves does not change.

The average atomic mass of your mixture is 1.03 u .

The average atomic mass of H is the weighted average of the atomic masses of its isotopes.  

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its % abundance).  

Thus,  

0.99    × 1.01 u = 0.998 u

0.002 × 2.01 u = 0.004 u

0.008 × 3.02 u = 0.024 u

            TOTAL =  1.03   u

c +o 2 = co 2 i think....hopefully its not wrong

I'm pretty sure the strongest metal known to man is Tungsten.

Answer: a) [tex]Frequency=666\times10^{12}Hz-789\times10^{12}Hz[/tex]

b) [tex]Wavelength=380nm-450nm[/tex]

Explanation: Visible light is a form of electromagnetic wave.

Wavelength is defined as the distance between two successive crests of a wave. It is represented as symbol [tex]\lambda[/tex].

Frequency is defined as the number of complete cycles happening per second. It is represented by the symbol [tex]\nu[/tex].

Wavelength and Frequency follow inverse relation,

                                              [tex]\nu=\frac{c}{\lambda}[/tex]

where, c = speed of light = [tex]3\times10^8m/s[/tex]

Wavelength and frequency of a wave is usually expressed in a range.

a)  [tex]\text{Frequency of visible light}=666\times10^{12}Hz-789\times10^{12}Hz[/tex]

b) [tex]\text{Wavelength of visible light}=380nm-450nm[/tex]

Answer: A. vegetables, meat, chicken

B. insects, fruits, seeds

Explanation:

A primary consumer is the trophic level in the food chain, which feeds upon the plants and other autotrophs. It includes all the herbivorous animals.

A secondary consumer is the trophic level in the food chain, which feeds upon the herbivorous animals. They are carnivores.

A and B are the two correct options. A will feed upon both plant and animal products such as vegetables and meat, and chicken respectively.

Also B also consumes over the plant products such as fruits and seeds and insects.  

Organisms A (omnivore consuming vegetables, meat, chicken) and B (eating insects, fruits, seeds) function as both primary and secondary consumers in a food web. They consume both producers like plants and other consumers like insects.

The commonly eaten foods of the organisms listed determine whether they are considered primary consumers, secondary consumers, or both. Organism A is an omnivore, consuming both plants and animals, making it both a primary and a secondary consumer. Organism B, which eats insects, fruits, and seeds, could also be considered both primary and secondary since it consumes plants and animals (insects). Organism C, which eats grasses, barks, twigs, and acorns, is primarily a primary consumer. Finally, Organism D, which eats other animals (ladybugs, caterpillars, flies, mosquitoes), is a secondary consumer.

Considering the options provided and the definitions of primary and secondary consumers, the correct pairing that identifies which organisms are both primary and secondary consumers is A and B. Organism C is only a primary consumer, and Organism D is only a secondary consumer.

c = f*L 

If you cant remember this just consider the units of each (denoted [c] is units of c): 

[c] = meters/second, [f] = 1/seconds or Hertz, [L] = meters 

So [c] = [f*L], an easy way to remember it. 

So to get the frequency, just solve for f: 

f = c/L = (3.00 x 10^8)/(5.93 x 10^-7) m/s = 5.05902192 × 10^14 m/s ~ 5.06 x 10^14 m/s 

Answer: Homogeneous mixture

Explanation:

Element: It is a substance made up from only one type of atom. It is not a mixture.

Heterogeneous mixture: This is a mixture having two or more substances that are unevenly distributed. The substances can be easily separated.

Homogeneous mixture: This is a mixture having two or more substances that are evenly distributed. These cannot be easily separated. The substances retain their original properties.

Compound: It is a substance which is composed of two or more elements in a specific ratio. these are evenly distributed but in this the elements do not retain their original properties.

Hence, from the above points, it is easily justified that homogeneous mixtures are the ones, where the particles are evenly distributed and also retain their original properties.

The predicted order of ionization energies is Li > Na > K > Rb

Atomic size increases as you go down a Group (see image). We are adding electrons to increasingly larger shells.

The valence electrons are further from the attraction of the nucleus, so they are less tightly held.

Thus, Li has the highest ionization energy and Rb the lowest.

Answer: Mass is neither lost nor gained during a chemical change.

Explanation:

Antoine Lavoisier’s Law of Conservation of Mass:

'In a chemical reaction the mass can neither be created and nor be destroyed'.

In a chemical reaction the mass of reactants is equal to the mass of products which means that the mass remain conserved.

For Example: In a chemical reaction:

[tex]2H_2+O_2\rightarrow2H_2O[/tex]

Mass of reactants = Mass of products

Mass of hydrogen molecule + mass of oxygen molecule = Mass of water

[tex]2\times (1)(2)+ 1\times (16)(2)= 2\times((1)(2)+(16)(1))=36[/tex]

From this we can see that the mass remains conserved in the chemical reaction.

Antoine Lavoisier's experiments fundamentally transformed the field of chemistry, particularly through his work on the law of conservation of mass.

Antoine Lavoisier's demonstrated that mass is neither created nor destroyed in chemical reactions, leading to the understanding that the total mass of reactants equals the total mass of products. This was a groundbreaking realization, as it contradicted the then-prevalent phlogiston theory, which posited that substances contained a fire-like element.

Lavoisier also played a crucial role in identifying and naming elements, distinguishing between elements and compounds, and introducing a systematic chemical nomenclature. His careful measurements during experiments laid the groundwork for quantitative analysis in chemistry. By meticulously weighing reactants and products, he provided strong evidence for the conservation of mass, which is a foundational principle in modern chemistry.

Answer:

The water molecules slow down, stronger attractions form between them, and the molecules are pulled closer together.

Explanation:

In solids the packing of the particles is closer and tighter thus increasing the intermolecular attraction. This makes solids rigid with a definite shape, size and volume. On the other hand in liquids the packing of the particles is loose thus decreasing the intermolecular attraction. This makes liquids able to flow, and takes the shape and volume of the container in which they are placed.

The correct description of the change when liquid water turns into solid ice in a freezer is:

The water molecules slow down, bonds are broken, and the separated atoms spread out. (first option)

Something interesting about water is that the solid state (ice) has a larger volume than the liquid one.

The expansion of ice compared to liquid water is due to the formation of an open, hexagonal crystal lattice in the solid ice structure, which results in ice having a lower density than liquid water. This expansion is related to the hydrogen bonds between water molecules, which create a network that pushes the molecules apart in the solid state, making ice less dense.

So, to accurately describe the change when liquid water turns into solid ice:

The water molecules slow down, stronger hydrogen bonds form between them, and the molecules are arranged in a hexagonal crystal lattice, causing ice to have a larger volume than liquid water.

The correct option would be the first one.

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The molecular formula is C₄H₈O.

We must calculate the masses of C, H, and O from the masses given.

Mass of C = 17.873 mg CO₂ × (12.01 mg C/44.01 mg CO₂) = 4.8774 mg C

Mass of H = 7.316 mg H₂O × (2.016 mg H/18.02 mg H₂O) = 0.818 48 mg H

Mass of O = Mass of compound - Mass of C - Mass of H

= (7.321 – 4.8774 – 0.818 48) mg = 1.6251 mg

Now, we must convert these masses to moles and find their ratios.

From here on, I like to summarize the calculations in a table.

Element     m/mg      n/mmol     Ratio    Integers  

     C          4.877 4    0.406 11   3.9984         4

     H         0.818 48   0.811 99   7.9944         8

     O         1.625 1      0.101 57   1                    1

The empirical formula is C₄H₈O.

the decay of the neutrons in the nucleus of the atom

The process of radiometric dating uses the decay of uranium-238 to lead-206 to determine the age of ancient rocks.

U-238 decays to stable Pb-206 largely by the emission of α particles, with a half-life of about 4.5 × 10⁹ a.

Thus, geologists can determine the age of rocks by measuring the relative amounts of U-238 and Pb-206.

However, the method is not “exact”.

The rock must be more than ten million years old so that enough uranium can decay to make the amount of lead measurable.

The age uncertainty for 100-million-year-old rocks ranges from 100 000 a

to 3 000 000 a.

The error margin for older rocks, say, 2.5 billion years old, can be as low

as 2 000 000 a. That’s a long time, but it’s an uncertainty of less than 0.1 %.

The calculation results in a specific heat of approximately 1.89 J/g°C.

To calculate the specific heat of the tires we first find the amount of heat absorbed by the brakes when they cool down.

Using the formula Q = mcΔT:
Heat absorbed by brakes Q = (90.7 kg)(1.400 J/g°C)(312°C)

Note that 1 kg = 1000 g, so we convert the mass of brakes from kg to grams.

Q = (90700 g)(1.400 J/g°C)(312°C) = 39930720 J

This same amount of heat is transferred to the tires. We can now calculate the specific heat of the tires.

Q = mcΔT, where m is mass, c is specific heat, and ΔT is the temperature change.

Rearranging the formula to solve for specific heat c:

c = Q / (mΔT)

Substituting Q = 39930720 J, m = 123000 g (since tires are 123 kg), and ΔT = 172°C:

c = 39930720 J / (123000 g * 172°C)

c = 39930720 J / 21156000 g°C

c = 1.89 J/g°C

The specific heat of the tires is approximately 1.89 J/g°C.

The first one is 206 then move, body, then protects, calcium,strong,blobs

Hello!

To find the number of moles that are in the given amount, we need to divide the total number of atoms by Avogadro's number, which is 1 mole is equal to 6.02 x 10^23 atoms.

5.0 x 10^25 / 6.02 x 10^23 ≈ 83.0564

Therefore, there are about 83.06 moles of iron (sigfig: 83 moles).

The answer is all elements are balanced.

Answer: This is a balanced equation

An easy way to figure out if the equation is balanced or not is that each element in the R.H.S should be equal to the element in the L.H.S

R.H.S                       L.H.S

Mg = 1                     Mg = 1

O = 1                       O = 1                                              

Li = 2                       Li = 2

Cl = 2                      Cl = 2

As both of them have equal number of elements they are balanced.

To solve this, first add 9 on both sides.

8x-9+9=8+9

8x=17

Then divide both sides by 8 to find the value of x.

[tex]\frac{8x}{8}[/tex]=[tex]\frac{17}{8}[/tex]

x=[tex]\frac{17}{8}[/tex]

The final answer is x=[tex]\frac{17}{8}[/tex] or 2.125.