Energy Changes and chemical Reaction ​

Answer: B

Explanation: Genetics has to do with genes, which is appearance, which is hereditary from the parent :)

The safety factor describes how much more robust a system is than is necessary for the load that is intended.

The shape, dimensions, and holes of a metal support bracket determine its strength. Static loading, bracket material Designing a metal support bracket that is strong depends on the metal's thickness and profile. Thus, strength is determined by shape, size, and holes. The bracket's material not only determines its strength, but it also has the ability to withstand rusting. Static loading examines the amount of load the bracket can support before deflection to evaluate the strength. utilising the safety factor .

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The number of moles of argon gas contained in a 4.00 l container at 1620. kpa and 25.0 °C. if the gas is helium instead of argon, the number mole did not change because number of moles is independent of the type of gas.

given that :

volume of gas = 4.00 L

pressure of gas = 1620 kpa = 15.9 atm

temperature = 273 + 25 = 298 K

R is gas constant = 0.082 L atm K / mol

according to ideal gas equation :

P V = nRT

n = P V / RT

  =  (15.9 × 4 ) / 0.082 × 298

  = 63.6 / 24.4

   = 2.6 mol

it is clear from the above equation the moles is independent of type of gas.

Thus, The number of moles of argon gas contained in a 4.00 l container at 1620. kpa and 25.0 °C. if the gas is helium instead of argon, the number mole did not change because number of moles is independent of the type of gas.

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The object will have the smallest change in motion when an equal force is applied is 8kg circle.

A force is described as an influence that can change the motion of an object.

A force can cause an object with mass to change its velocity or to change its acceleration. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.

The object will have the smallest change in motion when an equal force is applied is 8kg circle because according to Newton's second law which states that the rate of change of momentum of an object is directly proportional to the net force acting on it, provided that the mass of the body is kept constant.

This means that  as mass increases, force will increase. However, if acceleration is negative, then force will just increase by the same amount in the opposite direction.

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The statement which best describes the most likely effect of the mismatch on future birds is that there could be a shift to later reproduction in the birds and is therefore denoted as option C.

This is referred to as the process in which an offspring is produced from their parent or cells and involves the fusion of gametes.

In the effect of mismatch on future birds, there will be a reduction in the birds getting a mate which therefore shift to later reproduction and is therefore the reason why option C was chosen as the correct choice.

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The statement that describes the most likely effect of the mismatch on future birds is that there could be a shift to later reproduction in the

birds.

So option C is correct.

Reproduction is described as the biological process by which new individual organisms offspring are produced from their "parent" or parents.

If there is mismatch on future birds, one of the many effects is that there could be a shift to later reproduction in the birds which the consequences of such mistiming in reproduction are reduced reproductive output.

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The correct option are option C,E that is bonds between a sulfur atom and two hydrogen atoms were broken.  Zinc atom formed a bond with one sulfur atom.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

In the give reaction, bonds between a sulfur atom and two hydrogen atoms were broken. zinc atom formed a bond with one sulfur atom.

Therefore, the correct option are option C,E.

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Answer:

1) endothermic reaction - melting of ice to water

2) exothermic reactions - burning of candles

Explanation:

Endothermic reaction:

endothermic reactions are chemical reactions that absorb heat from the environment.

In this case, when ice is melting to turn into water it absorbs heat from its surroundings and melts.

Exothermic reaction:

exothermic reactions are chemical reactions that release heat as a form of energy when a reaction takes place.

In the case of burning a candle, the heat is released into the environment.

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Among the above given element pairs none of them are likely to form ionic compounds

Ionic bonds are basically the electrostatic attractions formed between oppositely charged ions in an ionic compound. Generally ionic bonds are often formed when electrons are transferred from metal atom to a non metal atom.

We can say that ionic bond is most likely formed between  metal and nonmetal elements .

In the above given electron pairs none of the pairs given are likely to form ionic compounds as none of the pair is of a metal and a nonmetal. An element can be classified  as a metal if its found on the left side of the periodic table while non metals are located on the right of the periodic table.

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The double or triple bond are needed because as they serves as a source of electron density and serves as a nucleophile.

The double bond or triple bond are electron rich entities capable of donating electrons thus act as nucleophile (species that donate electrons) and serve as electron dense region in molecules.

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Sodium acetate will form the basic salt when dissolved in water.

Water turns basic when a salt made from a strong base and a weak acid dissolves in it. Sodium ions and acetate ions are created when sodium acetate dissociates in water. There are no acidic or basic characteristics in the sodium ion. The conjugate base of acetic acid, the acetate ion, has a high affinity for H+ ions.

The solution turns acidic when a salt made from a potent acid and a feeble base dissolves in water. Chloride ions and ammonium ions are created when ammonium chloride dissociates. No affinity exists between the chloride ion and H+ ions.

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The plates which borders the great philippine plate are the:

It follows that all the plates which have the sea Philippines plates bordered have one thing in common. They are all defined by means of convergent boundaries. In order words, the Pacific, Sunda and Eurasia plates border the philippine plate are produced by different plates which are converging towards each other in several directions.

In conclusion, we can now know that one of the major plates which borders the sea philippines plate is the Pacific plates.

Complete question:

Which plates borders the philippine plate?

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The balanced chemical equation for the reaction FeCl2 + Na3PO4 -----> Fe3(PO4)2 + NaCl is 3FeCl2 + 2Na3PO4 ------> 6NaCl + Fe3(PO4)2.

What is a balanced chemical equation?

Balanced chemical equation is the equation of a reaction in which both reactant and product sides are equal in the number of atoms or molecules. The total charges on both the sides should be equal.

The given reaction can be made into balanced chemical equation by counting the number of atoms on both the sides. If the atoms of a particular element is less on either sides then multiply the whole molecule by a number which balances the number of atoms on the either sides of the reaction.

Therefore, the balanced chemical equation of FeCl2 + Na3PO4 -----> Fe3(PO4)2 + NaCl can be written as 3FeCl2 + 2Na3PO4 ------> 6NaCl + Fe3(PO4)2.

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These protons, neutrons and electrons are the three fundamental particles of atoms

What is atom ?

The atom is the smallest unit of matter that may be divided without releasing electrically charged particles. It is also the lowest unit of matter that has chemical element features. As a result, the atom is the fundamental building block of chemistry.

Examine various electron configurations in electron shells surrounding an atom's nucleus.

The majority of the atom is empty space. The rest of the structure is made up of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons. In comparison to electrons, the lightest charged particles in nature, the nucleus is small and dense.

The mass of an electron is approximately 9.109382911 1028 gramme. A proton or neutron has a mass that is approximately 1,836 times greater. This explains why the mass of an atom is governed mostly by the mass of its protons and neutrons in its nucleus.

Mass of protons, m

p =1.67×10 −27 kg

Mass of electrons, m

e =9.11×10 −31 kg

∴ m e

​mp≈1836

The proton to electron mass ratio is represented by μ or β. It is a dimensionless quantity.

μ= m e

​

mp≈1836

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When a sealed balloon containing Helium is squashed so its volume decreases, and no helium enters or leaves the balloon the density of the Helium in the balloon increases.

Note that the expression or equation for density is:

Density = Mass/ Volume

But we know that the mass of the Helium Atom is Constant.

Lets assume that is is 1,

Hence,

Density = 1/V

Hence, if V reduces, D increases creating an inverse relationship.

Note that the term density refers to how much space an item or substance occupies (its volume) in proportion to the amount of matter in that thing or substance (its mass). Density may also be defined as the quantity of mass per unit of volume.

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The mechanism and product for the given reaction after adding acid and water in the second step will result in the production of phenylpropanol.

The missing reaction scheme of the question is attached as a picture:

As a result of the reaction between benzaldehyde with diethyl ether (Et2O) and MgBr an intermediate results. This intermediate then reacts with hydronium to produce phenylpropanol. The hydronium ion generates as a reaction between the water molecule and a strong acid. Acid donates its proton to the water molecule. This hydronium ion then donates this proton to the resulting intermediate. The complete mechanism is attached:

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The charge for an ion of an element that has an outer electron configuration of ns2np3 is -3.

To be in a stable state, electrons try to make a noble gas configuration. The noble gas configuration is ns2 or ns2np6. So electrons try to gain or lose electrons to become ions. Ions have a charge according to the number of electrons captured (negative charge) or released (positive charge). The charge for an ion with the electron configuration

Ions with a negative charge are anions while ions with a positive charge are cations.

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One of the regulating services provided by the ecosystem is pollination. Option B.

Ecosystem services are natural processes that are maintained by the ecosystem but which benefit man and mankind.

There are different types of services offered by the ecosystem and that benefit man immensely. These are:

The ecosystem plays a regulatory role in the pollination of plants for the benefit of mankind. Wind helps to carry pollens from the anther to the stigma of flowers. By doing so, fruits, vegetables, seeds, etc, become available for the use of man.

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Answer:

C. .25 g/cm^3

Explanation:

density = mass ÷ volume

25÷100

0.25

The predicted electron geometry is a trigonal planar geometry.

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Recrystallization ; 25 mL of solvent are needed at 100 oC to dissolve 100 mg of the chemical. 75 mg of the chemical will precipitate at 0 oC while 25 mg will remain in solution.

The chemical compound para nitroacetanilide, commonly known as 4-nitroacetanilide, is a nitroacetanilide derivative made from acetanilide and a nitrating combination. A trace of ortho product also forms along with the para product.

Through nitration, the chemical molecule p-nitroacetanilide is created from acetanilide. P-nitroacetanilide is created when acetanilide is treated with a nitrating mixture, which is a combination of nitric acid and sulfuric acid. O-nitroacetanilide is also generated as a small byproduct along with p-nitroacetanilide. It is quite simple to separate p-nitroacetanilide through crystallization since o-nitroacetanilide is highly soluble in alcohol.

Because ethanol is endlessly cosoluble with water and has high dissolving properties for many organics, ethanol and water mixtures are frequently utilized. Many organic compounds' solubilities can be drastically and quickly decreased by the addition of water, which can cause crystallization.

The solution may become too diluted for crystals to form if you add too much solvent. The flask needs to be gently cooled, first at room temperature and then in cold water. Impurities will be captured by a hastily formed crystal's lattice. Smaller crystals will be produced as a result.

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The half life of the radioactive isotope is 25 million years.

The half life of the substance - The half life of the substance is the time taken by the substance to decay to its half concentration of the initial value.

All the radioactive reaction follows first order kinetics,

So, it means that,

If in 200 million years, only 1/16 of the original amount of the radio active atoms in a sample.

It means before 100 million years, the amount of the radioactive atoms were 1/8.

similarly, 50 million years, the amount of the radio active atoms were 1/4.

Continuing the pattern, 25 million years, the amount of the radio active atoms were 1/2.

So, after 25 million years, the amount of radioactive atoms in the sample left are 1/2 of the original amount.

So, the half life of the sample is 25 million years.

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Solute is the substance in a solution that has been dissolved. So option 4 is correct.

A homogeneous mixture of two or more substances, a solute is a substance dissolved in another substance known as a solvent. The concentration of a solute in solution is a measure of how well that solute is dissolved in a solvent, in terms of how much of that solvent, such as a salt, is present. The properties of solutes are:

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Answer: thermal

Explanation: I remembered

The class of Lewis structures known as resonance structures depicts the movement of bonds and lone pairs through various configurations. Resonating structures are produced by the complete transfer of electrons during delocalization from one atom to the following atom. We can infer from this that the distribution of charges is distributed evenly across the molecule, rather than being concentrated at a single location. The electrons are not concentrated around the sigma bond, as shown by resonance structures. The entire molecule now has a high electron charge density. The preferred representation of the molecule is displayed by the resonance structures. The collection of structures suggests that the pi bond's electrons are distributed evenly throughout the molecule and are not concentrated at any one point. Following the octet rule, resonating structures indicate that the atom

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Explanation:

through the process of electrolysis.

electricity (loose electrons under "pressure") is sent through water allowing the oxygen atoms to bind enough electrons to become independent O2 molecules and detach from water molecules, hence "freeing" themselves as oxygen gas. which in turn also creates free H2 molecules and therefore hydrogen gas.

the free oxygen collects at the positive electrode, the free hydrogen at the negative electrode.

an additional option is to collect the free oxygen that is simply mixed into the water and allows fish to "breathe" (the gills do NOT break oxygen out of the H2O molecules but use the mixed-in free O2 oxygen between the H2O molecules).

that is the reason why a fish tank needs the constant air stream bubbling through the water (or we would have to constantly stir the water in the tank rigorously), and why truly still water bodies "die" (any originally mixed-in oxygen leaves over time, literally suffocating any oxygen-needing lifeforms in those bodies of water).

to capture this, cool the water down to about 4° C (about 39° F), at which point water has its greatest density (below that water expands again preparing for the larger volume needed by the crystalline grid of water ice). that pushes/squeezes a lot of the mixed-in elements incl. free oxygen out of the water.

but that is very little compared to an electrolysis result.

You weighed out 0.50 g of zinc chloride salt instead of the 0.32 g required for the experiment.  it will not affect the empirical formula obtained.

The empirical formula is calculated by the number of moles of substances.  if we increase the number of mass of zinc chloride it will increase the number of moles of zinc and the chlorine. that would divide the number of moles to obtain the ratio. so, by increasing the weight of zinc chloride there will be no effect in the empirical formula . they will remain in same proportion.

Thus, You weighed out .50 g of zinc chloride salt instead of the .32 g required for the experiment.  it will not affect the empirical formula obtained.

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Answer:

22.4 liters

Explanation:

1 Mole of gas occupies 22.4 Litres of volume at STP.

Given, the mass of CO=14 g

Molar mass of CO=12+16=28 g

No. of moles of CO=

28

14

​

=0.5 Moles

So, CO occupies 0.5×22.4=11.2 L at STP.

Answer:

there are used to where large volumes are needed to be transferred and coloured graduated marks make it easier to measure the volumes. the disadvantage isthat they are not so precise and there are greater changes of human error

the concentration of Na after the two solutions are mixed together is 0.662 M.

1. Volume of Na2CrO4 = 132.4 ml = 0.1324 L.

2. Concentration of Na2CrO4 = 2.50 M

3. Volume of AgNO3 = 125 ml = 0.125 L

4.  Concentration of AgNO3 = 2.50 M.

Calculation :-

1. Moles of Na2CrO4 =  Molarity * Volume in L.

Moles of Na2CrO4= 2.50 * 0.1324 = 0.331 mol

2. Moles of AgNO3 = Molarity * volume in L

Moles of AgNO3 = 2.50 * 0.125 = 0.3125 mol

Solution :

the reaction of aqueous silver nitrate (AgNO3) with aqueous sodium chromate (Na2CrO4) to form solid silver chromate (Ag2CrO4) and aqueous sodium nitrate (NaNO3).

2 AgNO3(aq) + Na2CrO4 (aq) \rightarrow Ag2CrO4(s) + 2 NaNO3(aq).

Above balanced reaction shows that,

2 moles of AgNO3 reacts with 1 mol Na2CrO4.

Let,  0.3125 mol AgNO3 reacts with x mol Na2CrO4.

x = 0.3125 / 2

x = 0.1563 mol Na2CrO4.

Now,

1. Balanced reaction shows that,

2 mol AgNO3 forms 2 mol NaNO3.

So, 0.3125 mol AgNO3 forms 0.3125 mol NaNO3.

So,  moles of NaNO3 = 0.3125 mol.

As 1 molecule of NaNO3 gives 1 Na^+ ion.

0.3125 mol NaNO3 gives 0.3125 mol Na^+ ions...... A

Aslo,

2. remaining moles of Na2CrO4 = total moles - used moles

Remaining moles of Na2CrO4 = 0.331 - 0.1563 = 0.1748 mol.

1 molecule of Na2CrO4 gives 2 Na^+ ions.

So, 0.1748 moles of Na^2+ ions gives 0.3496 mol Na^+ ions............ B

3.So, total moles of Na^+ ions= 0.3496 + 0.3125......(from A and B)

Total moles of Na^+ ions = 0.662 mol.

So, concentration of Na^+ ions = 0.662 M.

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In March 1896 Antione Henri Becquerel (French chemist) discovered that the uranium mixture would introduce radiation even if it was not exposed to an exposed light.

Henri Becquerel made a chemical compound of the element Uranium (potassium uranyl sulfuric acid crystals) and produced a light glow around it. This compound is then placed on a dry photographic plate wrapped in thin black paper. It turns out that this light causes sensitivity to the dry plate photo

In 1896, Becquerel accidentally discovered radioactivity while observing the phosphorescence of uranium salts, a discovery by Wilhelm Rontgen. X-rays used a cathode-ray tube to produce X-rays. Becquerel wondered whether X-rays could not be produced by exposing ordinary sunlight to non-metallic substances. Coincidentally, Becquerel also discovered for the first time that this new type of radiation would be transmitted by any uranium chemistries. Since the radiation did not depend in any way on the chemical form of the uranium, Becquerel realized that the radioactivity was not of chemical origin, but had to be from the uranium atoms themselves.

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