Answer:
A
Explanation:
I think it's A. There are good answer for A.
what is electron
and the unit
An arrow is fired at a target on a high wall. How does the energy change between the moment the arrow is fired and the moment it hits the target?
o The potential energy and kinetic energy remain the same.
o The potential energy decreases as kinetic energy increases.
o The kinetic energy decreases as potential energy increases.
o The kinetic energy remains at zero, but potential energy increases.
The kinetic energy decreases as potential energy increases. Hence, option C is correct.
What is potential energy?Potential energy is stored energy that depends upon the relative position of various parts of a system.
As the target is fired high on the wall, the change in the energy that is observed as the arrow moves toward the target is kinetic energy starts to decrease as the arrow reaches nearer to the target and the potential energy is observed to increase.
So, in short, the energy transformation is from kinetic energy from a moving arrow to potential energy when the arrow hits the target.
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The bright-line emission spectrum of an element can best be explained by.
The light emitted by an element when its electrons return to a lower energy state can be viewed as a bright line emission spectrum.
What is Emission spectrum ?The distribution of electromagnetic radiation released by a substance whose atoms have been excited by heat or radiation.
A spectroscope can be used to determine which frequencies have been emitted by a substance.
An emission line will appear in a spectrum if the source emits specific wavelengths of radiation.
This emission occurs when an atom, element or molecule in an excited state returns to a configuration of lower energy.
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Select the correct answer from each drop-down menu.
Scientific theories are always
testable
. A theory may be changed as a result of
.
Scientific theories are always testable. A theory may be changed as a result of new observations.
What are Scientific theories ?A scientific theory is a set of laws, facts and hypotheses that have a complete vision of an aspect of reality.
It is a proposed explanation for a set of observable phenomena.
It allows in this way to organize and understand the observations and to be able to predict or provoke other future observations.
Theories can be modified or improved as more information is collected.
That is, theories can continue to be tested indefinitely, and eventually rejected, if the tests lead to it.
Therefore, a scientific theory is testable by using a research method.
As mentioned, any theory can be tested or rejected as more information is collected.
This information to prove or reject theories are interpretations of observable facts, which generates new statements or allows to accept those already included in the theory.
Then, a theory may be changed as a result of new observations.
Finally, scientific theories are always testable. A theory may be changed as a result of new observations.
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Answer:
testable & new observations
Explanation:
A piece of lithium is added to a beaker of water. Will the solution formed be acidic, alkaline or neutral?
Answer:
alkaline
Explanation:
Lithium reacts intensely with water, forming lithium hydroxide and highly flammable hydrogen. The colorless solution is highly alkalic.
According to the chemical reaction between lithium and water, lithium hydroxide is formed which is a basic substance.
What are chemical reactions?Chemical reactions are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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A can of coke which is 12.0ml and is at a temperature of 18.0°C is placed into a refrigerator freezer. The
can was accidently left over night and the temperature dropped to -1.00°C. What would happen to the
volume of the coke can?
Answer:
See below
Explanation:
Volume would decrease to temp of approx 4 C then it would slightly increase to the 1 degree C point but it would still be a smaller volume than at 18 C .
( this assumes a freezing point of - 1.11 C for Coke )
What molecule is shown below?
Answer: 3 methylhexane
Explanation: Attached is a picture of the molecule. Courtesy of the National Institute of Health, United States Government.
Answer: 3-methylhexane
Explanation:
The parent chain is six carbon atoms long, so there is the prefix 'hex'
There is a methyl branch on the third carbon atom, so it is 3-methylhexane.
calculate the amount of glucose required to prepare 250g of 5% sugar solution
Answer:
12.5g
Explanation:
1. Percentage of solution = 5.
2. Mass of solution = 250g.
3. = Mass of solute / 250 x 100.
4. = 5 x 250 / 100.
5. = 12.5g.
Explain why beryllium looses electrons while ionic bonds,while Sulfur gains electrons.
Answer:
Since Beryllium has a larger atomic radius than Sulphur its electrons are not strongly attracted to the nucleus hence lost easily. But Sulphur has a small atomic radius hence electrons are more closely attracted to the nucleus.
How many grams of butane were in 1. 000 atm of gas at room temperature?
The mass in grams of butane at standard room temperature is 53.21 grams.
How can we determine the mass of an organic substance at room temperature?The gram of an organic substance at room temperature can be determined by using the ideal gas equation which can be expressed as:
PV = nRT
1 × 22.4 L = n × (0.0821 atm*L/mol*K× 298 K)
n = 22.4/24.4658 moles
n = 0.91556 moles
Recall that:
number of moles = mass(in grams)/molar massmass of butane = 0.91556 moles × 58.12 g/mole
mass of butane = 53.21 grams
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why do crystals form during crystallisation
Answer: Crystallization is a technique which chemists use to purify solid compounds. Crystals often form in nature when liquids cool and start to harden. Certain molecules in the liquid gather together as they attempt to become stable. They do this in a uniform and repeating pattern that forms the crystal. The process is based on the principles of solubility: compounds (solutes) tend to be more soluble in hot liquids (solvents) than they are in cold liquids. If a saturated hot solution is allowed to cool, the solute is no longer soluble in the solvent and forms crystals of pure compound. Impurities are excluded from the growing crystals and the pure solid crystals can be separated from the dissolved impurities by filtration.
For an example the salt we get from seawater can have many impurities in it. Hence, the process of crystallization is in use to remove these impurities.
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As the solution cools, the solvent can no longer hold all of the solute molecules, and they begin to leave the solution and form solid crystals.
During this cooling, each solute molecule in turn approaches a growing crystal and rests on the crystal surface.
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How many moles is 25g of ammonia (NH3)?
Explanation:
Ammonia has a formula mass of 17.031 g/mol, so the top blank is 1 and the bottom blank is 17.031
Calculating the product, we get the answer to be 1.5 mol
What mass of YCL3 forms when 10.0 grams of each reactant are combined?
The mass of [tex]YCl_3[/tex] that would be formed will be 18.22 grams
Stoichiometric calculationsLet us first look at the balanced equation of the reaction:
[tex]2Y + 3Cl_2 --- > 2YCl_3[/tex]
The mole ratio of Y to [tex]Cl_2[/tex] is 2:3.
Mole of 10.0 grams of Y = 10/88.9 = 0.11 moles
Mole of 10.0 grams [tex]Cl_2[/tex] = 10/71 = 0.14 moles
3/2 of 0.11 = 0.165. Thus, [tex]Cl_2[/tex] is limiting in availability.
Mole ratio of [tex]Cl_2[/tex] and [tex]YCl_3[/tex] = 3:2
Equivalent mole of [tex]YCl_3[/tex] = 2/3 x 0.14 = 0.093 moles.
Mass of 0.093 moles [tex]YCl_3[/tex] =0.093 x 195.26 = 18.22 grams
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How many moles of propane
react when 294 g of CO2 form?
C3H8 +502 → 3CO₂ + 4H₂O
2.23 moles of propane react when 294 g of CO₂ is formed .
What is moles ?Moles is a unit which is equal to the molar mass of an element.
A reaction is given
C₃H₈ +50₂ → 3CO₂ + 4H₂O
Grams of CO₂ formed = 294 gm
In moles = 294 /44 = 6.68 moles.
Let x be the moles of C₃H₈ is x
Mole ratio of CO₂ to C₃H₈ = 3 : 1
so
6.68 /x = 3/1
x = 6.68 /3 = 2.23 moles
Therefore 2.23 moles of propane react when 294 g of CO₂ is formed .
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Most alkaline permanent waves have a pH between:
The alkaline permanent waves have a pH between 9.0 to 9.6.
What are Alkaline permanent waves?Alkaline permanent waves are chemical that is apply to the hair. The alkaline perm makes the hair curly or wavy.
The major ingredient is the ammonium thioglycolate and ammonium hydroxide.
The alkaline permanent wave is alkaline in nature and the pH scale for alkaline substances are higher.
pH of 7 depicts neutrality while pH of 7 and above depicts alkalinity.
Therefore, alkaline permanent waves have a pH between 9.0 to 9.6.
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Which of the following compounds would make a good electrolyte?
Select one:
O a. ethanol
O b. carbon dioxide
O c. sodium chloride
O d. water
Answer:
C. Sodium Chloride.
Explanation:
Because when NaCl dissolved in water, it will dissociate to produce 2 ions Na+ and Cl-.
How many grams Fe2O3 would be
required to make 187 g Fe?
Fe₂O3 + 3CO →2Fe + 3CO2
267.14 gm grams[tex]Fe_2O_3[/tex] would be required to make 187 g Fe.
What is a balanced chemical equation?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
The balanced equation:
Fe₂O₃ + 3 CO ⟶ 3 CO₂ + 2 Fe
We know that the molecular mass of iron-oxide = 160 g/mole.
We know that the molecular mass of iron = 56 g/mole.
From the above reaction, we can say that
1 mole of iron -oxide produces 2 moles of iron
160 gm of iron oxide produce 112 gm of iron
So,
1 gm of iron required 160÷112 =1.42 gram of iron oxide
Therefore,
187 gm of iron required 1.42 x 187 =265.54 of iron oxide.
Therefore 187 gm of iron required 267.14 iron oxide.
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30 points!!!! Answer fast
EXPERIMENT: MAGNETISM Bar Magnet
1. Place the bar magnet on a table.
2. Put a sheet of glass or plastic over the magnet.
3. Sprinkle the iron filings over the sheet evenly.
4. On a separate paper, sketch the magnet. Show the lines made by the iron filings. Horseshoe Magnet
5. Place a horseshoe magnet on the table.
6. Put a sheet of glass or plastic over the magnet.
7. Sprinkle the iron filings over the sheet.
8. On a separate paper, sketch the magnet. Show the lines made by the iron filings. N Pole to N Pole
9. Place two bar magnets N pole to N pole with an inch between them.
10. Put a piece of glass or plastic over the magnets.
11. Sprinkle the iron filings over the glass or plastic.
12. On a separate paper sketch the magnets. Show the lines made by the iron filings. N Pole to S Pole
13. Turn one of the bar magnets around so the magnets are N pole to S pole with an inch between.
14. Sprinkle the iron filings over the glass or plastic.
15. On a separate paper sketch the magnets. Show the lines made by the iron filings.
From the information you have observed, determine the following:
What rule of magnetism is illustrated by the lines of the iron filings in Step 12?
What rule of magnetism is illustrated by the lines of the iron filings in Step 15?
Why was glass or plastic used to separate the filings from the magnets in the experiments?
Did the glass or plastic stop the passage of the magnetic lines of force?
Did the iron filings almost or completely bridge the open end of the horseshoe magnet?
The magnetism is either created inside a given element by passing some number of charges,Q across it or it is due to the interaction with a permanent magnet.
What is Magnetism ?
A physical phenomenon produced by the motion of electric charge, which results in attractive and repulsive forces between objects.
The magnet consists the characteristics of having an optimum amount of energy (P.E inside it) inside it.
As, the energy lines are either directed outwards from the north pole of the magnet, the south pole of the magnet consumes or absorbs the magnetic rays(energy lines) originated from the north pole of the magnet.
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Read about Flexon below. What scientific name is given to this kind of alloy?
Flexon :
Flexon is the trademarked name for a special material that is used to make frames for spectacles. It is light and extremely flexible. If it is bent it will 'remember' its original shape and return to it.
IBUPROFEN-400MG + PARACETAMOL-325MG is the scientific name Flexon.
What does Flexon mean?Flexon is the trademark for a shape memory alloy of titanium that is used to make eyeglass frames.
The metal alloy used by Flexon in their eyewear was actually destined for a very different path when, in 1961, US Naval Scientists creating a missile heat shield discovered that the alloy they were using automatically returned to its original shape, even after being hit by a hammer.
Flexon is the trademarked name for a special material that is used to make frames for spectacles. It is light and extremely flexible. If it is bent it will 'remember' its original shape and return to it.
Flexon eyeglasses are all made of memory metal titanium.
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A 208.1 mL sample of gas exerts 574.6 mm Hg pressure at 44.4 ºC. What pressure does it exert at 68.1 ºC if the volume expands to 401.5 mL?
a. 320
b. 457
c. 190
d. 917
Answer:
a. P = 320 mmHg
Explanation:
For this problem, the pressure, volume, and temperature are changing, so we'll need to combine Boyle's Law and Charles' Law:
[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
For this equation, the temperatures must be measured in Kelvin. The rest of units in the equation only need to match between beginning and end conditions.
Recall that to convert from Celsius to Kelvin, add 273, or use the equation [tex]T_C+273=T_K[/tex].
So [tex]T_1=(44.4+273)[K]=317.4[K][/tex] and [tex]T_2=(68.1+273)[K]=341.1[K][/tex]
Substituting known values, we can solve for the unknown:
[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
[tex]\dfrac{(574.6[mmHg])(208.1[mL])}{(317.4[K])}=\dfrac{P_2(401.5[mL])}{(341.1[K])}[/tex]
[tex]\dfrac{(574.6[mmHg])(208.1[mL]\!\!\!\!\!\!\!\!\!\!{--} )}{317.4[K]\!\!\!\!\!\!{-}}*\dfrac{341.1[K] \!\!\!\!\!\!{-}}{401.5[mL] \!\!\!\!\!\!\!\!\!\!\!{--} }=\dfrac{P_2(401.5[mL] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})}{341.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}*\dfrac{341.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}{401.5[mL] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----} }[/tex]
[tex]320.056719296[mmHg]=P_2[/tex]
Accounting for significant figures, [tex]P_2=320.1[mmHg][/tex].
The closest answer provided is 320, so "a".
what is the molarity of the NaOH
the answer is:
40 g/mole
The valence electrons found in metallic bonds are different from other bonds
because
A. their valance electrons are free-roaming
B.they allow conductivity of electricity
C.their valence electrons are immobile
D. They’re able to share electrons with other atoms
Answer:
their valence electrons are free roaming
The speed of light through space is
The speed of light through space is 300 million m/s .
What is the limit of the speed ?There was a time when everybody thought that there is no limit for the speed at which an object can travel , but Einstein gave the limit which is the speed of light.
The speed of the light in vacuum travels at a speed of 300 million m/s .
Therefore The speed of light through space is 300 million m/s .
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What does it mean when a solution is saturated?
O The container is full.
O No more solute can dissolve in solvent.
O The solute has turned into a solid.
O The solvent has turned into a solid.
Answer:
A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the container.
Explanation:
if element X has two valence electrons and element Y has five valence electrons the formula for the compound is?
Answer:
the answer to the question is X3Y2
Why do you need to combust benzoic acid before testing the "unknown" sample you are interested in? Why do you need to combust more than one sample of the "unknown" you are testing?
Various samples of the must be combusted in other to obtain a reliable result.
What is a bomb calorimeter?The bomb calorimeter is used to obtain the energy of a sample. This is called the energy equivalent or the energy value of the sample.
Now, we know that the bomb calorimeter is calibrated by the use of benzoic acid hence it must be combusted first to obtain the basic energy value of the calorimeter.
Various samples of the must be combusted in other to obtain a reliable result.
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Please select the word from the list that best fits the definition
Rock that is formed from the remains of older rocks and organisms
Super position
Radioactive dating
Sedimentary
Igneous
Metamorphic
Rock Cycle
A compound has an empirical formula C₂H4S.
What is its molecular formula, if its molar
mass is 168 g/mol?
This means that the molar mass of [tex]\text{C}_{2}\text{H}_{4}\text{S}[/tex] is
[tex]2(12.011)+4(1.00794)+32.06=60.11376[/tex]
Dividing this by the given molar mass, we get [tex]\frac{168}{60.11376} \approx 3[/tex]
So, the molecular formula is about [tex]\boxed{\text{C}_{6}\text{H}_{12}\text{S}_{3}}[/tex]
Determine if the following is a compound , Element or Mixture
Compound is a group of same molecules, Element is a group of same atoms and mixture is combination of two or more pure substances.
What are Molecules ?
Molecules are the combination of two or more different atoms combine in a fixed ratio.
Molecules can be independently founded.
Atoms are always founded in combined state and does not occurs independently except rare earth elements which belongs to 18th group of periodic table.
Chemicals are taken in compound state But they undergo chemical reaction individually in molecular level.
Hence, Compound is a group of same molecules, Element is a group of same atoms and mixture is combination of two or more pure substances.
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Q2:- Which branch of chemistry deal with the structure and properties of naturally occurring molecules?
Answer:
Explanation:
Organic ChemistryOrganic Chemistry It is often known as the 'Chemistry of Life' that deals with the structure, properties and reactions of organic compounds. A study of Organic Chemistry helps students to identify and classify the various naturally occurring compounds and to create one with desired properties and functions.
The branch of chemistry that deals with the structure and properties of naturally occurring molecules is Organic Chemistry.
What is Organic chemistry?Chemistry is divided into several branches in which we learn inorganic chemistry, Physical chemistry, analytical chemistry and also organic chemistry. Organic chemistry deals with natural compounds in which we learn about chemical and physical properties of natural compounds and then the structures of organic compounds as well. We study about the formation of different organic compounds and which kind of compounds will be useful in which field.
For example- Alcohols can be used in vehicles, as solvents, it can be used to form many other organic compounds as well.
Aldehydes, Ketones are the organic compounds which has medicinal use and helps in forming other compounds as well.
Therefore, The branch of chemistry that deals with the structure and properties of naturally occurring molecules is Organic Chemistry.
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