Which pair shares the same empirical formula?
1. C2H4 and C6H6
2. CH2 and CH4
3.CH3 and C2H6
4. CH and C2H4

The total mass of the reactants equals the total mass of the products, because matter is not created or destroyed in the reaction.

Answer:

A

Explanation:

JJ Thomson concluded that atoms must balance positive and negative particles.

From his experiments, JJ Thomson concluded that atoms must balance positive and negative particles. He proposed a model known as the 'plum pudding' model, in which atoms were described as a positively charged mass with an equal amount of negative charge in the form of electrons embedded in it. This model suggested that atoms are made of thousands of electrons swimming around in a nebulous mass of positive charge.

Answer is: 2,0,0,±1/2.

1) n = 1. The principal quantum number (n) is one of four quantum numbers which are assigned to each electron in an atom to describe that electron's state.

2) l = 0. The azimuthal quantum number is a quantum number for an atomic orbital that determines its orbital angular momentum and describes the shape of the orbital.

3) ml = 0. Magnetic quantum number specify orientation of electrons in magnetic field and number of electron states (orbitals) in subshells.

Magnetic quantum number (ml) specifies the orientation in space of an orbital of a given energy and shape . Magnetic quantum number divides the subshell into individual orbitals which hold the electrons, there are 2l+1 orbitals in each subshell.  

4) The spin quantum number, ms, is the spin of the electron; ms = +1/2 or -1/2.

The possible quantum number set for an electron in the 2s orbital of a beryllium (Be) atom is n=2, l=0, ml=0, and ms=+1/2 or -1/2.

The possible quantum number set for an electron in the 2s orbital of a beryllium (Be) atom can be described as follows:

These quantum numbers represent the energy level, shape, orientation, and spin of the electron in the 2s orbital.

Hello!

To find electron configuration for Idoine we need to understand the following steps:

In this case, for Iodine. If we follow these rules we can see that the electron configuration is [Kr] 4d^10 5s^2 5p^5. We use Krytpon in front because that is the last full and stable noble gas before this particular element. Atoms are just trying to be stable so the goal is to achieve that full shell.

The electron configuration for a neutral iodine atom is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵, and for an iodine anion (I⁻), it gains one more electron, resulting in 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶.

The electron configuration of iodine (I), which is a halogen with the atomic number 53, follows the aufbau principle and Hund's rule, filling orbitals in order of increasing energy. For a neutral iodine atom, the electron configuration is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵.

When iodine forms an anion with a 1- charge, such as when it's added to table salt as an essential dietary element to prevent goiter, it gains an extra electron. The electron configuration for the iodine anion (I⁻) is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶.

Hey there!

Given the reaction:

4 AI + 3O2 ------>  2 AI2O3

4 moles Al --------- 3 moles O2

9.30 moles Al  --------- ?? moles  O2

9.30 * 3 / 4  =>  6.975 moles of O2

Molar mass O2 => 32.0 g

Therefore:

6.975 * 32.0 =>  223.3 g of Oxygen

Hope that helps!

Answer:

The Somatic nervous system and The autonomic nervous system

are two parts of the peripheral nervous system.

Explanation:

The peripheral nervous system is a part of the nervous system which is present outside the spinal cord and the brain.

Its function is to link the central nervous system to the organs and limbs.

The peripheral nervous system is of two types

Somatic nervous system: its main function is to regulate the body movements and the control of voluntary muscular activity is called reflex arcs

The autonomic nervous system: its function is to control all the body functions like digestion, urination.heart rate, pupillary response, and respiratory rate.

96.56064 is the kilometers for 60 miles.

The distance between Happyville and Giggleland is approximately 96.56 kilometers when converted from miles.

To convert distance from miles to kilometers, we utilize the conversion factor of 1 mile = 1.60934 kilometers. Given that the distance between Happyville and Giggleland is 60 miles, you will multiply 60 by 1.60934.

So, Giggleland is approximately 96.56 kilometers from Happyville.

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1. Plasma is "the state..." because plasma is rarely natural on earth (only lightning strikes) and has the highest temp

gas is "particles move freely" they do move freely

liquid is "it expands to fill volume" they do not have definite boundaries so they fill up the container

solid is "it retains its shape" yup dis is pretty obvious ig

2.

I agree with your answers.

it wouldnt be hypothesis or theory because they are basically the same thing and they explain facts. fact would be the best answer

conduct experiments would be the most logical here because you can gain new knowledge from conducting experiments instead of the rest.

Potassium (K) has a larger atomic radius than lithium (Li) because it is located further down in Group 1 of the periodic table, indicating it has more electron shells.

To determine which atom has a larger atomic radius between lithium (Li) and potassium (K), we need to look at the periodic table. Atomic size increases as we move down a group because each successive element has an additional electron shell. Thus, lithium, which is located at the top of Group 1, has fewer electron shells compared to potassium that is found further down the same group.

Lithium is in the second period and contains only two electron shells, while potassium is in the fourth period and contains four electron shells. This additional number of shells in potassium means its electrons are held further away from the nucleus compared to lithium. Therefore, potassium has a larger atomic radius than lithium.

The dependent variable is the breaking distance. The independent variable is the tire treads. The constant variable is the type of vehicle.

In an experiment, the independent variable is the variable that is being manipulated and the dependent variable that changes value as the independent variable is manipulated.

In this case, the breaking distance changes as the tire tread changes. This means that changes in the tire tread determines the breaking distance. Thus, the tire tread is the independent variable and the breaking distance is the dependent variable.

The experiment must be performed using the same type of car or vehicle. This is the constant variable.

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The independent variable in a study examining the impact of different tire treads on braking distance is the tire tread condition, while the dependent variable is the braking distance itself. Constants include factors that are kept the same throughout the experiment.

In the context of a study aiming to determine whether different tire treads affect the braking distance of a car, the independent variable is the type or condition of the tire treads being tested, because this is what the experiment changes to see its effect. The dependent variable is the braking distance, since it depends on the condition of the tire treads. The constants in such an experiment might include the make and model of the car, the driver, speed at which the brakes are applied, and environmental conditions like weather, if you can control and keep them the same throughout the testing. By maintaining constants, the study can ensure that any changes in the braking distance are likely due to the changes in the tire tread, which is the independent variable.

The three main ideas behind capitalism as defined by Adam Smith are "competition, self interest, and laissez-faire," since Smith was a heavy proponent of the "invisible hand of the market".

The concentration of solution in M or mol/L can be calculated using the following formula:

[tex]C=\frac{n}{V}[/tex] .... (1)

Here, n is number of moles and V is volume of solution in L.

The molecular formula of potassium sulfate is [tex]K_{2}SO_{4}[/tex] thus, there are 2 moles of potassium in 1 mol of potassium sulfate.

1 mol of potassium will be there in 0.5 mol of potassium sulfate.

Mass of potassium is 4.15 g, molar mass is 39.1 g/mol.

Number of moles can be calculated as follows:

[tex]n=\frac{m}{M}[/tex]

Here, m is mass and M is molar mass

Putting the values,

[tex]n=\frac{(4.15 g}{(39.1 g/mol}=0.1061 mol[/tex]

Thus, number of moles of  [tex]K_{2}SO_{4}[/tex] will be [tex]0.1061\times 0.5=0.053 mol[/tex].

The volume of solution is 225 mL, converting this into L,

[tex]1 mL=10^{-3}L[/tex]

Thus,

[tex]225 mL=0.225 L[/tex]

Putting the values in equation (1),

[tex]C=\frac{(0.053 mol}{0.225 L}=0.236 M[/tex]

Therefore, concentration of potassium sulfate solution is 0.236 M.

In chlorine gas, two pairs of valence electrons the atoms share and a non- polar covalent bond is formed.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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Answer: Helps visualize feeding relationships in nature

Explanation:

A food web in nature is a interconnection of food chains. In the food chains the food is distributed among various organisms, when organism is consumed by the another.

A scientific model is a kind of simulation that can be used to mimic the natural processes occurring in nature. These can be useful in learning, understanding and demonstrating the natural process.

Among the options given,  Helps visualize feeding relationships in nature is the correct option. This will help in determining how food chains are related in a food web depending upon the feeding relationship between the organisms.  

Hello!

The chemical equation for the neutralization of HCl with KOH is the following:

HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)

To calculate the concentration of the unknown solution, we can apply the following equation for the equivalence point:

So, the concentration of the HCl solution is 1,246 M

Have a nice day!

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Th correct answer is option C. Calling can be hazardous because it also attracts parasites and predators.

The mating call is used by the males to attract females for sexual reproduction. By using vocal sounds males are not only making themselves attractive to females, they are also making themselves vulnerable to predators.

Thus the mating call can have a disastrous effect on the survival of the species.

Answer: C.

Calling can be hazardous because it also attracts parasites and predators.

Explanation:

The correct name of the compound is potassium bromate.

KBrO₃ contains a metal, so it is an ionic compound.

The name of an ionic compound is: name of metal cation + name of anion .

Name the metal

The name of the cation is the name of the metal — potassium

The ion has only one charge (+1), so the name of the ion does not use a Roman numeral in parentheses.

Name the anion

BrO₃⁻ is an oxyanion. Name = (stem)ate = bromate.

Name the compound

The names of salts do not use multiplying prefixes like mono- or di-.

∴ metal ion + anion → potassium bromate

The correct name for the compound KBrO3 is potassium bromate.

The correct name for the compound KBrO3 is potassium bromate. It is a chemical compound that was formerly used as a food additive in baking to improve dough elasticity and bread volume. It acts as a strong oxidizing agent. However, due to concerns about its potential carcinogenicity, many countries have banned or restricted its use in food products.

Potassium bromate can potentially break down into bromide, which can react with other compounds in baking to form brominated byproducts. As a result, safer alternatives like ascorbic acid (vitamin C) and potassium iodate are now commonly used in the baking industry to achieve similar results without health risks.

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Explanation: During winters, there is decrease in temperature which leads to the freezing of water molecules.

The state change occurs from liquid state to solid state.

In case of water, the inter-molecular forces between the molecules decreases which leads to the increase in volume.

Which in turn leads to the decrease in the density of solid (ice). This increase in density tends to the floating of ice on water.

[tex]Density=\frac{Mass}{Volume}[/tex]

Thus, on freezing, the water expands and hence, there will be more space for the arctic animals to hunt in winters.

Answer: Option (d) is correct.  

EXplanation:

The susceptibility to search for interpreted data in such a way that confirms the hypothesis is known as confirmation bias.

Scientific consensus is the collective decision or opinion of scientists in an experiment or study.

Peer view is the collective view of two or more persons in an experiment that will lead to a collective conclusion.

Selection bias is the bias that occurs because of selection of data due to which proper results are not obtained.

Therefore, when two scientists work together on an experiment but they have different hypothesis and when the scientist look at experimental results they interpret the data in different ways and come up with different conclusions, this situation is a confirmation bias.

Thus, out of the given options, option (d) is correct.  

In order to follow the steps of inquiry Denver should add some salt to water taken in vessel and heat it. Once the water comes to a boil, Denver should insert a thermometer into the boiling water and measure the temperature of it. Pure water boils at 100°C. Denver will have to note if the salt water boils at a higher or lower temperature than 100°C.

Answer:

Impurities decrease the boiling point of a liquid, hence the boiling point of the salt solution will be less than that of pure water.

Explanation:

If Denver wants to know if adding salt to water will reduce the boiling point of water, Denver needs to set up the apparatus for the inquiry as follows;

A boiling tube

A Bunsen burner with wire gauze

A thermometer

A test tube holder

The thermometer is placed inside the boiling tube while the salt solution his allowed to boil. The boiling point is observed using the thermometer. Impurities decrease the boiling point of a liquid, hence the boiling point of the salt solution will be less than that of pure water.

Answer: The correct option is B.

Explanation: All the given reactions are a type of single displacement reactions.

Single displacement reactions are defined as the reactions in which a more reactive metal displaces a less reactive metal in a chemical reaction.

General equation for these reactions is:

[tex]AB+C\rightarrow CB+A[/tex]

For the given reactions, we will use the reactivity series. The metal which lies above in the reactivity series will easily displace the metal which lies below in the reactivity series.

Option A: For this reaction, zinc lies below aluminium in the reactivity series. Hence, zinc will not be able to displace aluminium in the chemical reaction.

Option B: For this reaction, Sodium is more reactive than calcium as it lies above in the reactivity series. Hence, sodium will easily displace calcium in the given chemical reaction.

Reaction follows:

[tex]CaBr_2+2Na\rightarrow 2NaBr+Ca[/tex]

Option C: For this reaction, hydrogen lies below magnesium in the reactivity series. Hence, hydrogen will not be able to displace magnesium in the chemical reaction.

Option D: For this reaction, Calcium lies below barium in the reactivity series. Hence, calcium will not be able to displace barium in the chemical reaction.

Option E: For this reaction, barium lies below lithium in the reactivity series. Hence, barium will not be able to displace lithium in the chemical reaction.

Reactivity series is attached below.

Answer : The reaction form products that are more stable than the reactants will be:

(B) [tex]CaBr_2+2Na\rightarrow 2NaBr+Ca[/tex]

Explanation :

Single displacement reactions : It is defined as the reactions in which a more reactive metal displaces a less reactive metal in a chemical reaction.

The general equation is:

[tex]AB+C\rightarrow CB+A[/tex]

According to the reactivity series, the metal which lies above in the reactivity series will easily displace the metal which lies below in the reactivity series.

(A) [tex]2AlBr_3+3Zn\rightarrow 3ZnBr_2+2Al[/tex]

In this reaction, zinc is less reactive than aluminum as it lies below in the reactivity series. Hence, zinc will not be able to displace aluminium in the chemical reaction. This reaction will not takes place.

(B) [tex]CaBr_2+2Na\rightarrow 2NaBr+Ca[/tex]

In this reaction, sodium is more reactive than calcium as it lies above in the reactivity series. Hence, sodium will easily displace calcium in the given chemical reaction.

(C) [tex]MgBr_2+H_2\rightarrow 2HBr+Mg[/tex]

In this reaction, hydrogen is less reactive than magnesium as it lies below in the reactivity series. Hence, hydrogen will not be able to displace magnesium in the chemical reaction. This reaction will not takes place.

(D) [tex]BaBr_2+Ca\rightarrow CaBr_2+Ba[/tex]

In this reaction, calcium is less reactive than barium as it lies below in the reactivity series. Hence, calcium will not be able to displace barium in the chemical reaction. This reaction will not takes place.

(E) [tex]2LiBr+Ba\rightarrow BaBr_2+2Li[/tex]

In this reaction, barium is less reactive than lithium as it lies below in the reactivity series. Hence, barium will not be able to displace lithium in the chemical reaction. This reaction will not takes place.

The mass of Ben’s dog is 20 kg.

Mass = 2 m³ × (10 kg/1 m³) = 20 kg

As mentioned in its properties, one of the properties of synthetic fibres is that it will stick to the body if in contact with fire, or high temperatures. Hence, as the answer follows, rayon, being a synthetic fibre, will stick to the body.

Answer:

1. The sediment is deposited by wind, flowing water, or other natural processes.

2. The sediment is gradually buried and compacted.

3. Dissolved minerals completely cement the sediment together.

Explanation:

Weathering is the breakdown of rock by agents such as wind and water. Erosion is the transporting of the broken rock material, or sediments, to a new location, where it is deposited.

As more sediment is deposited, it stacks up in layers. Eventually, the upper layers put pressure on the lower layers. This causes sediments to pack closer together in a process called compaction.

Through the process of cementation, minerals from groundwater form between sediment grains, connecting the grains together to form rock.

The rocks formed from deposition, compaction, and cementation of sediment are sedimentary rocks.

The sediment goes through a series of steps to become sedimentary rock, which includes deposition, burial and compaction, and cementation.

The correct order of the steps in which a layer of sediment becomes sedimentary rock is as follows:

Hello!

Before I can answer your question we need to know the different types of chemical reactions that can occur:

Combustion is an answer that can usually be ruled out unless oxidation is occuring in the chemical equation (hyrdrogen occuring with oxygen to react)

Synthesis reaction, also known as a Combination reaction, is when the reactants combine to form a single product.

Decompostion is when a single reactant is deconstructed to form multiple products, or the opposite of Synthesis.

With these definitions alone, since they are opposite types of reactions, the answer would be Synthesis and Decomposition reactions !

Hope this helps and if you need anymore clarification feel free to ask.

Answer: Synthesis and decomposition

Hello,

As the speed increases the Energy does not change. This is because of Law of conservation of mass. Energy can be created or destroyed.

Thus the energy levels will stay the same but the form in which the energy is presented may change.

Hope this helps! Have a great day.

The electron's potential energy declines and its kinetic energy rises as its speed increases. The system's overall energy, however, doesn't change, since the increase in kinetic energy makes up for the decrease in potential energy.

Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is compressed or stretched, its potential energy increases. If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy.

The square of the object's velocity determines the kinetic energy. In other words, when an object's velocity twice, its kinetic energy quadruples.

The mechanical energy of an object is the total of its potential and kinetic energies. A falling object loses potential energy while gaining kinetic energy. The difference between the increase in kinetic energy and the decrease in potential energy is exact. Work is a further crucial idea.

Thus, the increase in kinetic energy makes up for the decrease in potential energy.

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The concentration of A will be 0.34 mol·L⁻¹ after 60 min.

In a first-order reaction, the formula for the amount remaining after n half-lives is

[tex]\text{[A]} = \frac{\text{[A]}_{0}}{2^{n}}\\[/tex]

If [tex]t_{\frac{1}{2}} = \text{20 min}\\[/tex]

[tex]n = \frac{t}{t_{\frac{1}{2}}} = \frac{\text{60 min}}{\text{20 min}}= \text{3.0}[/tex]

∴ [tex]\text{[A]} = \frac{\text{2.7 mol/L}}{2^{3.0}} = \frac{\text{2.7 mol/L}}{8.0} = \textbf{0.34 mol/L}[/tex]