Answer:
Hydrogen
Electronic notation
Explanation:
Is there a need for adhesives?
Answer:
yes
Explanation:
what would happen if the next time you needed tape or glue you remember, oh wait theres none at the house, thats just an example of why you would indeed need adhesives
Ocean water Choose one: A. is less dense than freshwater. B. salinity decreases as seawater evaporates. C. contains dissolved salts, like halite and gypsum. D. has an average salinity of 35%.
Answer: the answer is C
Explanation:
Ocean water contains dissolved salts, like halite and gypsum. The correct option is C.
What is the ocean?The ocean is the salty water that covers an area of 70.08% of the total surface. It is a large body of water that covers the entire earth. There are seven oceans present with different names, and they are connected with each other. The ocean is one of the traveling routes for traveling and exporting and import of products.
The average salinity of the ocean is 3.5%. It contains salts, halite, and gypsum-like minerals and substances.
Thus, the correct option is C. contains dissolved salts, like halite and gypsum.
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How do the elements beryllium, carbon, and oxygen produce stars such as the Sun?
Answer:
Beryllium, carbon, and oxygen do not create stars like the sun. The sun is a massive cluster of hydrogen atoms being fused into helium atoms and heavier metals like Beryllium, carbon, and oxygen through the process of nuclear fusion. The more mass a star has in its core the more fusions that can occur and the heavier the metals inside can be fused into.
Explanation:
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A 32.1 mole sample of gas has a temperature of 21 Celsius and a pressure of 2280.0 torr. What is the volume of the gas?
The volume of the gas is 27 ml
The calculation can be done as follows
The first step is to convert the pressure to atm
convert 2280 tors to atm
760 tors= 1 atm
= 2280/780
= 3 atm
The formula is
PV= nRT
The next step is to write out the parameters
Pressure= 3 atm
Temperature= 21 °C
no of moles= 32.1 mole
volume= ?
(r)constant= 8.314
3 × v= 32.1×8.314×21
3v= 81.080
V= 81.080/3
V= 27 ml
Hence the volume of the gas is 27 ml
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Can someone tell me how to calculate the percentage of purity of a sample in a compound and the percentage of the compound in the sample
Answer:
Percentage purity of a substance can be calculated by dividing the mass of the pure chemical by the total mass of the sample, and then multiplying this number by 100.
Explanation:
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Which of the following has kinetic energy?
O A compressed spring
O An arrow shot from a bow
O water in a reservoir at a hill top
O Amonkey hanging from a tree
Kinetic energy is energy that an object possesses due to its motion.
Lets look at each option:
A compressed spring has potential energy.
An arrow shot from a bow does have Kinetic energy.
Water in a reservoir at a hill top is potential energy.
A monkey hanging from a tree is potential energy.
This means that the answer is B) An arrow shot from a bow
I hope this helps! :)
According to law of conservation of energy,energy is converted from one form to another so by this fact an arrow shot from a bow has kinetic energy generated from potential energy.
What is law of conservation of 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 1842.
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How many atoms can be found in a sample of 75g of silicon
Answer:
[tex]\boxed {\boxed {\sf 1.6 \times 10^{24} \ atoms \ Si}}[/tex]
Explanation:
We are asked to find how many atoms are in a sample of 75 grams of silicon.
1. Convert Grams to MolesFirst, we must convert grams to moles using the molar mass. This is the mass of 1 mole of a substance. The molar mass is found on the Periodic Table because it is equal to the atomic mass, but the units are grams per mole instead of atomic mass units.
Look up the molar mass of silicon.
Si: 28.085 g/molWe convert using dimensional analysis, so we must set up a conversion factor.
[tex]\frac {28.085 \ g \ Si}{1 \ mol \ Si}[/tex]
We are converting 75 grams of silicon to moles, so we multiply by this value.
[tex]75 \ g \ Si*\frac {28.085 \ g \ Si}{1 \ mol \ Si}[/tex]
Flip the conversion factor so the units of grams of silicon cancel.
[tex]75 \ g \ Si*\frac {1 \ mol \ Si}{28.085 \ g \ Si}[/tex]
[tex]75 *\frac {1 \ mol \ Si}{28.085 }[/tex]
[tex]\frac {75}{28.085} \ mol \ Si[/tex]
[tex]2.670464661 \ mol \ Si[/tex]
2. Convert Moles to AtomsNext, we convert moles to atoms using Avogadro's Number, or 6.022 ×10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this problem, the particles are atoms of silicon.
Set up another conversion factor, this time with Avogadro's Number.
[tex]\frac {6.022 \times 10^{23} \ atoms \ Si}{1 \ mol \ Si}[/tex]
Multiply by the number of moles we found.
[tex]2.670464661 \ mol \ Si*\frac {6.022 \times 10^{23} \ atoms \ Si}{1 \ mol \ Si}[/tex]
The units of moles of silicon cancel.
[tex]2.670464661 *\frac {6.022 \times 10^{23} \ atoms \ Si}{1 }[/tex]
[tex]2.670464661 * {6.022 \times 10^{23} \ atoms \ Si}[/tex]
[tex]1.60815382 \times 10^{24} \ atoms \ Si[/tex]
The original value of grams (75) has 2 significant figures, so our answer must have the same. For the number we found, that is the tenths place. The 0 in the hundredths place tells us to leave the 6 in the tenths place.
[tex]1.6 \times 10^{24} \ atoms \ Si[/tex]
Argon (Ar): [Ne]3s23p6 core electrons valence electrons
Answer:
1. The core electrons are 10
2. The valence electrons are 8
Explaination:
Core electrons are electrons located in the inner shells of and atom.
Valence electrons are electrons located on the outermost shell of an atom
From the question given above, we obtained:
Ar (18) => [Ne] 3s²3p⁶
Recall
Ne (10) => 1s² 2s²2p⁶
Therefore,
Ar (18) => [1s² 2s²2p⁶] 3s²3p⁶
From the above illustration,
Inner shell (core shell) => 1s² 2s²2p⁶
Outermost shell (valence shell) => 3s²3p⁶
1. Determination of the core electrons
Inner shell (core shell) => 1s² 2s²2p⁶
Core electrons = 2 + 2 + 6
Core electrons = 10
2. Determination of the valence electrons
Outermost shell (valence shell) => 3s²3p⁶
Valence electron = 2 + 6
Valence electron = 8
Answer:
10 core electrons
8 valence electrons
Explanation:
Draw an example of a buffer in the body.
Explanation:
this is answer.
Fill in the the correct term to complete the sentence provided. The ______ produces chemical changes to provide energy.
Answer:
chemical reaction
Explanation:
The chemical reaction produces chemical changes to provide energy. Chemical reactions often involve changes in energy due to the breaking and formation of bonds.
—————— —should be treated chemically before deposing it to rivers.
——Industrial waste——— should be treated chemically before deposing it to rivers.
=》The waste from factories & industries are highly acidic/base. This leads to the increase/decrease of the pH value of water in the rivers making it contaminated & unfit for drinking. This also causes a huge problem for aquatic organisms.
=》Industrial waste should be neutralized before depositing it into water bodies to reduce these risks.
_______
⚜ Hope it helps :))
Answer: Industrial waste
Explanation:
a
A molecule that experiences London dispersion forces is
likely to have a • boiling point than a molecule
experiencing a dipole-dipole interaction.
pls
Answer:
it should be the second one since London dispersion causes interaction between molecules.
hope I helped.
Generally non ionic species with no polarity forms the London -dispersion bonds. London dispersion is weaker than the dipole-dipole interaction and hence it have less boiling point.
What is boiling point?Boiling point of a substance is the temperature at which the substance changes from liquid state to gaseous state or vapor where, the two states are in equilibrium.
Boiling of a substance depends on the molecular weight, bond type,temperature, pressure as well as purity of the substance.
London dispersion force is formed between two non-polar atoms. These atoms when come closer they attains a temporary polar nature and gets bonded.
Dipole-dipole bond is formed between two atoms of permanent dipole moment and they are polar compounds. Thus dipole-dipole interaction is stronger than London dispersion interaction. A strong bond needs more energy to boil.
Hence, molecules with Dipole-Dipole bond is having higher boiling point.
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how to experiment titration
Answer:
Add a volume of a solution of known concentration is added to a volume of another solution in order to determine its concentration. Solutions in which a few drops of phenolphthalein have been added turn from colorless to brilliant pink as the solution turns from acidic to basic.
If you want the method:
Method
1) Use a pipette and pipette filler to add 25 cm3 of alkali solution to a clean conical flask.
2) Add a few drops of a suitable indicator and put the conical flask on a white tile.
3) Fill the burette with dilute acid. Flush the tap through to remove any air bubbles. Ensure the burette is vertical.
4) Slowly add the acid from the burette to the conical flask, swirling to mix. (The mixture may at first change colour, and then back again when swirled.)
5) Stop adding the acid when the end-point is reached (when the colour first permanently changes). Note the final volume reading.
6) Repeat steps 1 to 5 until three results are repeatable (in close agreement). Ideally these should lie within 0.10 cm3 of each other.
I hope it helps.
Answer:
To conduct a titration experiment, first fill the burette with an acid or base solution of known concentration. After that, take a burette reading from the top of the miniscus down to the bottom. Then, underneath the burette, place a flask containing an unknown concentration of acid or base. After that, fill the flask halfway with the appropriate indicator and shake it up. Add your titrate to the flask one drop at a time while stirring constantly. Continue to add the titrate until the color change is noticeable. Finally, take one more look at the burette to make sure everything is correct.
Explanation:
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Consider an ice cube and a hot radiator. Which has the higher thermal energy?
the ice cube
the radiator
The thermal energy of a material increases with temperature. Therefore, the radiator has the higher thermal energy.
What is thermal energy?When the temperature rises, a type of energy called thermal energy is produced. The amount of thermal energy usually directly inversely proportional to the object's change in temperature. Thermal energy takes the form of heat.
The thermal energy of a material increases with temperature. The quicker motions of the substance's atoms and molecules are what cause thermal energy to grow as temperature rises.
In some cases, a substance's molecules will separate from one another and leave because the temperature is just so high. Unexpectedly, thermal energy also affects the states of matter. The radiator has the higher thermal energy.
Therefore, the radiator has the higher thermal energy.
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What do we call the repeating units of a larger molecule?
Answer:
Brainlest
Explanation:
A polymer is a molecule made up of repeating units. These units, called “monomers”, form a long molecular chain. It might have branches, or it might just be one straight line of molecules, each connected in the same way. A monomer of polyethylene
Aluminium reacts with sulfuric acid to form aluminium sulfate and hydrogen. What is the volume of
hydrogen gas in liters (L) produced at 300 K and 1.0 atm pressure, when 5.4 g of aluminium and
50.0 mL of 5.0 M sulfuric acid are combined for the reaction?
Answer:
[tex]2al + 3h2so4 = > al2(so4)3 + 3h2 \\ eqvt \\ = > \frac{5.4}{27} = > \frac{5 \times 50}{1000} \\ .2 \: mol = > .25 \: mol \\ \\ so \: .25 \: is \: limiting \: reagent \\ according \: to \: ideal \: gas \: equation \\ pv = nrt \\ v = \frac{nrt}{p} \\ v = \frac{.25 \times .082 \times 300}{1} \\ = \frac{1}{4} \times 8.2 \times 3 \\ = 2.05 \times 3 \\ = 6.15litre \\ thank \: you[/tex]
Zingerone, one of the flavor molecules in ginger,
contains only C, H, and O. Combustion of 10.0 g
of zingerone produces 24.91 g of CO2 and
6.522 g of H20. Determine the molar mass of the
compound if it is between 150.0 and 220.0 g/
mol. Provide an answer to four significant
figures.
The molecular formula of the compound is C12H15O3 hence the molar mass of the compound is 207 g/mol.
We need to obtain the number of moles of carbon, hydrogen and oxygen in the compound;
Carbon = 24.91 g/44g/mol × 1 mole of carbon = 0.566 moles
Mass of carbon = 0.566 moles × 12 g/mol = 6.792 g
Number of moles of hydrogen = 6.522 g/18 g/mol × 2 moles = 0.725 moles
Mass of hydrogen = 0.725 moles × 1 g/mol = 0.725 g
Mass of oxygen = 10 - (6.792 g + 0.725 g) = 2.483 g
Number of moles of oxygen = 2.483 g/16 g/mol = 0.155 moles
Now we must divide through by the lowest number of moles;
C - 0.566/0.155 H - 0.725/0.155 O - 0.155/0.155
C - 4 H - 5 O - 1
The simplest formula is C4H5O Recall that the molar mass of the compound lies between 150.0 and 220.0 g/mol
4(12) + 5(1) + 16 = 69
Hence; n = 3 and the molecular formula of the compound is C12H15O3
The molar mass of the compound is; 12(12) + 15(1) + 3(16) = 207 g/mol
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One type of sunburn occurs when skin is exposed
to UV light of wavelength in the vicinity of 315 nm.
What is the energy of a photon of this wavelength?
Answer:
E = 6.27 × 10⁻²³ Joules
Explanation:
E = h (Plancks constant) × f (frequency)
(Plancks constant = 6.63 × 10⁻³⁴ J×s)
f = λ × c (used to find frequency so you can satisfy energy equation)
*Have to find wavelength in meters to multiply by speed of light*
1. f = (3.15 × 10⁻⁷ m) × (3 × 10⁸ m/s)
2. f = 9.45 × 10¹⁰ s
3. E = (6.63 × 10⁻³⁴ J×s [Plancks constant]) × (9.45 × 10¹⁰ s)
E = 6.27 × 10⁻²³ Joules
I am not feeling well
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a solution of HCI contains 36 percent HCI,by mass and calculate the mole fraction of HCI in the solution?
Explanation:
You have a solution that contains 36 g HCl dissolved in 64 g water
Molar mass HCl = 36.45 g/mol
Mol HCl in 36 g = 36 g / 36.45 g/mol = 0.9876 mol
Molar mass H2O = 18 g/mol
Mol H2O in 64 g = 64 g / 18 g/mol = 3.5556 mol
Total mol = 0.9875 + 3.5556 = 4.5431 mol
Mol fraction HCl = 0.9876 mol / 4.5431 mol = 0.2174
Mol fraction H2O = 3.5556 / 4.5431 = 0.7826
The answer should have 2 significant digits:
Mol fraction HCl = 0.22
Mol fraction H2O = 0.78
Mol fraction has no units.
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How many aluminum atoms are there in 3.50 grams of Al2O3?
Answer:
Answer:
Aluminium atoms = 4.13 *10^22 aluminium atoms
Explanation:
Explanation:
Step 1: Data given
Mass of Al2O3 = 3.50 grams
Molar mass of Al2O3 = 101.96 g/mol
Number of Avogadro = 6.022 * 10^23 /mol
Step 2: Calculate moles Al2O3
Moles Al2O3 = mass Al2O3 / molar mass Al2O3
Moles Al2O3 = 3.50 grams / 101.96 g/mol
Moles Al2O3 = 0.0343 moles
Step 3: Calculate moles Aluminium
In 1 mol Al2O3 we have 2 moles Al
in 0.0343 moles Al2O3 we have 2*0.0343 = 0.0686 moles Al
Step 4: Calculate aluminium atoms
Aluminium atoms = moles aluminium * Number of Avogadro
Aluminium atoms = 0.0686 * 6.022 * 10^23
Aluminium atoms = 4.13 *10^22 aluminium atoms
What is the empirical formula of CoH1803? (4 points)
-O CH30
-C₂H50
-C₂H₂O
-O C₂H5O5
Answer:
-O CH30
Explanation:
My Head Is About To Explode
Which best describes the energy change that takes place during deposition?
Heat energy released by the substance
Heat energy is maintained by the substance
Heat energy is slowly gained by the substance
Heat energy is quickly absorbed by the substance
Answer:
heat energy released by the substance
The energy change that takes place during deposition is that heat energy is released by the substance. This statement is true about deposition.
Deposition is a phase transition that occurs when a gas is converted directly to a solid without passing through the liquid state. During deposition, energy is released by the gas particles and absorbed by the surface, resulting in a decrease in the energy of the gas particles and an increase in the energy of the surface particles.As a result, the substance releases heat energy as it changes from a gas state to a solid state.
Therefore, the correct option is:Heat energy released by the substance.
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Be sure to answer all parts. Select the anti periplanar geometry for the E2 reaction of (CH3)2CHCH2Br with base. mc2x mc2xd1 mc2xans mc2xd2 Then draw the product that results after elimination of HBr. draw structure ...
The anti periplanar geometry for the E2 reaction of (CH3)2CHCH2Br with base is shown in the image attached as well as the structure of the product formed in the reaction.
In organic chemistry, an antiperiplanar conformation is one in which the groups point up and down at a dihedral angle of 180° away from one another. In the image attached, the antiperiplanar conformation of (CH3)2CHCH2Br is shown.
Recall that an E2 reaction is a synchronous elimination reaction where to atoms leave at the same time. The product of this reaction is also shown in the image attached.
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What is the concentration of chloride ions in solution after the reaction of 5.8 mL 0.12 M ammonium chloride with 3.2 mL 0.21 M silver nitrate
Answer:
ok
Explanation:
find the answer
science
Answer:
Transparent- air,water,sheet of plane glass,
Opaque- piece of rock,sheet of aluminium,mirror,wooden board,CD,umbrella,wall,sheet of carbon paper,sheet of cardboard
Translucent-sheet of polythene,sheet of cellophane,smoke,fog,wire
●Luminous- iron,lighted fluorescent tube,flame of gas burner, lighted torch,kerosene stove,sun,firefly
Non Luminous- water,air,rock,sheet of polythene,sheet of aluminium,mirror,wooden board,sheet of polythene,CD,smoke,sheet of plane glass,fog,wall,umbrela,sheet of carbon paper,cardboard sheet,cellophane sheet,wire,moon.
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methane the principal component of natural gas is used for heating the cooking the combustion process is
Answer:
CH4 + O2 = CO2 + 2H2O
Explanation:
carbon dioxide and water is given off
If 48 grams of carbon are burned in the presence of 128 grams of oxygen, the amount of carbon dioxide that forms will be ______.
A. 48 grams
B. 128 grams
C. 176 grams
D. 224 grams
Answer:
C. 176 grams
Explanation:
48g / (12g/mol) = 4.0mol. Moles of Oxygen used. = 128g / (32g/mol) = 4.0mol. C + O2 => CO2. Therefore ...
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Answer:
Option B
Explanation:
Magnesium is an alkali earth metal and chlorine is a nonmetal. Due to this, and their differences in electronegativity, the elements form an ionic bond. Since magnesium has two valence electrons, it will give them up to two chlorine atoms (which has 7 valence electrons), which needs them to complete its octet. From this, magnesium forms a cation, and will have the ion formula Mg(2+). The two chlorine atoms form anions, and will have the ion formula Cl(1-).
Terms:
Cation: a positively charged ionAnion: a negatively charge ion.Electronegativity: the tendency of an atom in a molecule to attract the shared pair of electrons towards itself.13500 mL convert to milliliters of mercury
Answer:
5.627 × 1019 milliliters
Explanation:
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