Answer:
D.) 4
Explanation:
Al + 3 O₂ --> 2 Al₂O₃
In the equation, there are:
Reactants: 1 Al and 6 O
Products: 4 Al and 6 O
To determine how many atoms there are of each, you multiply the coefficients by the subscripts attached to the atoms. While the question doesn't ask, as you can see, the oxygen atoms are balanced because there is an equal amount on both sides. To balance the aluminum atoms, you can get 4 aluminum atoms on the reactants side by using a coefficient of 4.
The new equation would look this this:
4 Al + 3 O₂ --> 2 Al₂O₃
There are now:
Reactants: 4 Al and 6 O
Products: 4 Al and 6 O
which five atoms tend to form double of triple bonds? explain why these atoms form double and triple bonds.
Answer:
The formation of double and triple bonds is not as widespread among the atoms of the periodic table as one might expect. At least one of the atoms involved in a multiple bond is almost always C, N, or O, and in most cases both atoms are members of this trio
Covalent bonding occurs when electrons are shared between atoms. Double and triple covalent bonds occur when four or six electrons are shared between two atoms, and they are indicated in Lewis structures by drawing two or three lines connecting one atom to another.
Explanation:
Balance the chemical equation
Explanation:
please mark me as brainlest
How many atoms are there in 12 moles of sulfur
A colloid in which a liquid is dispersed in a solid is called a(n)
Answer:
GEL
Explanation:
A colloid is a type of mixture that consists of insoluble particles in another substance. Liquid dispersed in a colloidal solid is called a gel.
What is gel?A gel is the dispersion of liquid molecules in a solid medium. It is a type of mixture that includes the suspension of particles in another substance. They are colloid that behaves like solid.
The liquid molecules of the medium become thick and viscous in the solid particles and form aggregates of the particles.
Therefore, colloid in which liquid is dispersed in solid is gel.
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3. What is the hydrogen ion concentration of a solution with a pH of 2.0?
Answer:
[H+] = 10^-2
Explanation:
pH = -log[H+]
2 = -log[H+]
[H+] = 10^-2
The solution to be tested in this experiment must be buffered to ph of 10. If the ph were considerably higher, such as 12, how would the [oh-] change
For a solution to be tested in this experiment and must be buffered to pH of 10, the [OH-] change will be, The hydroxide concentration would be higher and the formation of insoluble hydroxide salts with Mg^2 and Ca^2 would cause the determined concentration of water hardness to be too low.
What would be the [OH-] change?
Generally, the equation for the Total hardness is mathematically given as
[tex]T=\frac{A*D*1000}{B}[/tex]
Where
[tex]D=\frac{molarity}{0.01}[/tex]
D=0.02/0.01=2
Therefore
[tex]T=\frac{A*D*1000}{B}\\\\T=\frac{20.4*2*1000}{25}[/tex]
T=1632ppm
in conclusion, The hydroxide concentration would be higher .
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The solution to be tested in this experiment must be buffered to a pH of 10. If the pH is high to 12, the change of [OH-] is 1632 ppm.
What is OH- ion?OH- ion is the hydroxide ion or hydroxyl ion. It is made up of a hydrogen and oxygen ion with a covalent bond.
[tex]A =\dfrac{A \times D \times 1000}{T} \\[/tex]
The buffered pH is 10
The higher pH is 12
D = molarity divided by 0.01, that is the pH
[tex]D = \dfrac{molarity }{0.01}\\\\D = \dfrac{0.02 }{0.01} = 2[/tex]
Now, putting the values in the first equation
[tex]A =\dfrac{20.4 \times 2 \times 1000}{25} = 1632 \;ppm[/tex]
Thus, the correct option is the change in hydroxide ion is 1632 ppm.
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Draw n‑ethyl‑3‑methylpentanamide. Include all hydrogen atoms
The structure of the compound n‑ethyl‑3‑methylpentanamide is attached to this answer.
What is IUPAC nomenclature?The IUPAC nomenclature was given in order for us to be able to draw the structure of a compound from its name. This is the generally accepted means of naming compounds globally.
The structure of the compound n‑ethyl‑3‑methylpentanamide in which all the hydrogen attched are shown attached to this answer.
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The structure of n‑ethyl‑3‑methylpentanamide. Include all hydrogen atoms are attached. Its chemical formula is C₈H₁₇NO.
What is n‑ethyl‑3‑methylpentanamide?N-ethyl-3-methylpentanamide has a five-carbon parent chain attached to an amide functional group in its structural formula.
An amide's N-atom also has an ethyl substituent. At the C-3 position of the parent chain, a methyl group is substituted.
Thus, the of n‑ethyl‑3‑methylpentanamide. Include all hydrogen atoms are attached. Its chemical formula is C₈H₁₇NO.
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if there are 0.0023 moles of water in a sample, how many molecules are there?
39 g H
2
O
contains
1.3
×
10
24
molecules H
2
O
.
Explanation:
One mole of water has a molar mass of
18.015 g/mol
and
6.022
×
10
23
molecules H
2
O
. Therefore,
1 mol H
2
O
=
18.015 g H
2
O
=
6.022
×
10
23
molecules H
2
1O
Multiply the given mass of water times the conversion factors that cancel grams and moles of water, leaving molecules of water, as demonstrated below.
39
g H
2
O
×
1
mol H
2
O
18.015
g H
2
O
×
6.022
×
10
23
molecules H
2
O
1
mol H
2
O
=
1.3
×
10
24
molecules H
2
O
39 g H
2
O
contains
1.3
×
10
24
molecules H
2
O
.
Explanation:
One mole of water has a molar mass of
18.015 g/mol
and
6.022
×
10
23
molecules H
2
O
. Therefore,
1 mol H
2
O
=
18.015 g H
2
O
=
6.022
×
10
23
molecules H
2
1O
Multiply the given mass of water times the conversion factors that cancel grams and moles of water, leaving molecules of water, as demonstrated below.
39
g H
2
O
×
1
mol H
2
O
18.015
g H
2
O
×
6.022
×
10
23
molecules H
2
O
1
mol H
2
O
=
1.3
×
10
24
molecules H
2
O
39 g H
2
O
contains
1.3
×
10
24
molecules H
2
O
.
Explanation:
One mole of water has a molar mass of
18.015 g/mol
and
6.022
×
10
23
molecules H
2
O
. Therefore,
1 mol H
2
O
=
18.015 g H
2
O
=
6.022
×
10
23
molecules H
2
1O
Multiply the given mass of water times the conversion factors that cancel grams and moles of water, leaving molecules of water, as demonstrated below.
39
g H
2
O
×
1
mol H
2
O
18.015
g H
2
O
×
6.022
×
10
23
molecules H
2
O
1
mol H
2
O
=
1.3
×
10
24
molecules H
2
O
hello people ~
Which one of the following is a thermosetting plastic?
A. PET
B. Acrylic
C. Melamine
D. Polylactide
Answer:
Answer: C
Melamine resin or melamine formaldehyde (also shortened to melamine) is a resin with melamine rings terminated with multiple hydroxyl groups derived from formaldehyde. This thermosetting plastic material is made from melamine and formaldehyde.
Melamine formaldehyde is a thermosetting plastic (or thermoset) that strengthens as it is heated during its preparation.
(1.) Once we confirm other planetary systems, what do you think the
next stage of exploration should be?
The next stage of exploration should be gathering information about the planetary system.
What is the next stage of exploration?Once we confirm other planetary systems, the next stage of exploration should be the use of instruments that helps us to collect information about that planetary objects so we can conclude that the next stage of exploration should be gathering information about the planetary system.
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What happens to water when it freezes?
a) it expands.
b) it forms vapor
c) its density increases.
d) its composition changes
Answer:
it expands
Explanation:
Answer:
a) it expands.
Explanation:
Water is more dense when it is a liquid, and less dense as a solid. This is why ice floats above water.
Hence, Ice expands when it freezes.
Answer this question
Answer:
1.312788 atm
Explanation:
The number of protons and neutrons in an atom is that atoms __ number.
A glass container was initially charged with 1.95 moles of a gas sample at 3.75 atm and 21.7 °C. Some of the gas was released as the temperature was increased to 28.1 °C, so the final pressure in the container was reduced to 0.998 atm. What quantity in moles of the gas sample are present at the end?
Answer:
45830.4 moles
Explanation:
Ideal gas law is the hypothetical equation in which the pressure, volume, and temperature of the gas are directly related. It can be denoted as:
PV = nRT
The ideal gas law is:
PV = nRT
where,
P = Pressure
V = Volume
R = Gas constant
T =Temperature
n = moles
Given:
Moles in container = 1.95
Temperture = 294.85 K
Pressure = 3.75 atm
Volume =?
Substituting the values:
V = nRT/P
V = 1.95 × 0.082 × 294 / 3.75
Volume = 12.5 L
Now, the condition when changed, such that temperature is 301.25 K, pressure is 0.998 atm, and Volume is 12.5 L, then moles will be equal to:
PV/RT = n
0.998 × 12.5 / 0.082 × 301.25 = n
n = 45830.4 moles
Therefore, 0.521 moles is still present in the container.
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typical "lead" pencil is actually made from carbon. if the carbon in the pencil weighs 1.50 grams, the pencil has [atoms] atoms of carbon.
In an exothermic reaction, which condition will be true?
A.) Activation energy will be less than the energy of the reactants.
B.) Activation energy minus energy of the products will be greater than activation energy minus energy of reactants.
C.) Activation energy minus energy of the products will be less than activation energy minus energy of reactants.
D.) Activation energy will be less than the energy of the products.
Activation energy will be less than the energy of the products in an exothermic reaction. Therefore, option (D) is correct.
What is exothermic reaction?In this type of reaction, the energy of the products is lower than the energy of the reactants. As a result, the difference in energy is released as heat or light, which can be detected by measuring the temperature or observing the light emitted during the reaction.
Exothermic reactions occur spontaneously, meaning they do not require an external energy source to start the reaction. Common examples of exothermic reactions include combustion, oxidation, and neutralization. These reactions often involve the formation of stronger bonds between atoms or molecules, which releases energy in the form of heat or light.
Exothermic reactions play an important role in many natural and industrial processes, including respiration, photosynthesis, and the production of electricity in power plants.
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Compare the relative strength of the two forces A and B. Explain how you determined this comparison by identifying the forces.
The intermolecular forces present in B will be much stronger than the intermolecular forces present in A.
What are intermolecular forces?The term intermolecular forces has to do with the forces that hold molecules of a substance together in a particular state of matter. Now, we can see that B must contain dipole - dipole interaction while A has none of these.
It then follows that the intermolecular forces present in B will be much stronger than the intermolecular forces present in A.
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A neutralization reaction is a reaction between choose. That results in the formation of choose. And choose.
Neutralization reaction is the reaction that occur between acid and base.
What is Neutralization reaction?Neutralization reaction is the reaction that take place between acid and base to produce salt and water. For examples HCl react with NaOH to produce NaCl and H2O
Therefore, Neutralization reaction is the reaction between acid and base.
The question is not complete but the option are gotten from another website.
Here are the options.
an acid and a basea fuel and oxygenan acid and a metala salt and a baseLearn more about neutralization from the link below.
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The aldol condensation involves nucleophilic attack of an enolate to a carbonyl. Use the pop-up menus to identify the total number of aldol products that each of the following reactions can produce
Aldol condensation involves the reaction of an acid or base with a carbonyl group producing a nucleophile that attacks another carbonyl compound to yield a β-hydroxyaldehyde or β-hydroxyketone compound.
What is aldol condensation?The aldol condensation is a reaction in organic chemistry in which there is a reaction between an acid or base and a carbonyl group which then serves as the nucleophile that attcks a second carbonyl to yield a β-hydroxyaldehyde or β-hydroxyketone compound.
The aldol condensation may be acid catalysed or base catlysed. The question is incomplete hence the complete mechanimsms can not be decuced.
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The distance between a carbon atom and an oxygen atom in the co molecule is how far from the carbon atom is the center of mass of the molecule?
Answer:
1.12x10-10 or 0.63 ewan
Explanation:
Correct option is C)
The distance of centre of mass from carbon atom is,
xcm=m1+m2m1x1+m2x2
=12+1612×0+16×1.1
=0.63A˚
Thus, the centre of mass is 0.63A˚ from carbon atom.
The distance between a carbon atom and an oxygen atom in the co molecule is 0.63
What is the distance?Distance is the measurement of the farness of two objects from each other.
The distance between the molecules can be calculated by the given formula
[tex]xcm = m_1+m_2m_1\times 1+m_2 \times 2[/tex]
Putting the values in the equation
[tex]xcm = 12+1612 \times 0+16 \times 1.1 = 0.63 A^\circ[/tex]
Thus, the distance between a carbon atom and an oxygen atom in the co molecule is 0.63
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hello people ~
Modern non-stick cookware and the flat end of an electric iron has a coating of a polymer. Identify the name of the polymer.
A. PVC
B. Rayon
C. Teflon
D. Polyester
Answer:
Teflon
Explanation:
Teflon is a very good polymerIt is known for its nonstick behavior .So it's used in cookwares to cook food and in irons also
pls explain
help would be appreciated
Answer:
b
Explanation:
many solids are crystalline hence a is eliminated
graphite contains free electrons while diamond uses all electrons in bonding and many substances have that property hence c is eliminated
only substances made up of carbon produce carbondioxide as the product when burnt
Determine the maximum amount of Fe that was produced during the experiment. Explain how you determined this amount
The number of moles of iron produced can be obtained by the use of stoichiometry.
What is stoichiometry?The term stoichiometry has to do with mass - mole or mass - volume relationships. Stoichiometric relationships could be used to determine the amount of substance.
Now the reaction equation as well as other details are not shown in this question hence a numerical anwer can not be provided. As such, we can know that the balanced reaction equation can always be used to obtain the amount of iron by stoichiometry.
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When the carbonator adds CO 2 to the solution, a ________ is added to the reaction, which pushes the reaction in the
________ direction.
a. product, forward
b. product, reverse
c. reactant, forward
d. reactant, reverse
(CO2 is added to H2CO3)
When the product is added to the solution, it will shift the reaction forward.
What is Carbonation?Carbonation is a form of chemical reaction in which carbon dioxide is added to a solution to give carbonates, bicarbonates, and carbonic acid. In chemistry, the term is used in place of carboxylation to form carboxylic acids
When a product is added to a system, the equilibrium will shift to the left, so as to produce more reactants but if the reactants is remove from the system, equilibrium will also be shifted to the left.
Therefore, When the product is added to the solution, it will shift the reaction forward.
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* look at the photo *
1. saturated solutions of each of the following compounds are made at 20°c. circle the letter(s) of the solution(s), which will form a precipitate upon heating.
a) nacl b) na2so4 c) li2co3 d) sucrose
2. a saturated solution of potassium chloride is prepared in 100.0 g of water at 20°c. if the solution is heated to
50°c, how much more kcl must be added to obtain a saturated solution?
3. a saturated solution of sucrose in 1000.0 g of boiling water is cooled to 20°c. what mass of rock candy will be formed?
The solubility curve can show the variation of solubility with temperature.
What is a saturated solution?A saturated solution is one in which there is just enough solute as it can dissolve at a given temperature. The imege is missing hence the question is incomplete.
The solubility curve shows us the solubility of each substance but unfortunately we do not have it hence we can not answer the questions but we do know that the solubility curve can show the variation of solubility with temperature.
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Helppp
1.
You should NEVER dump the following into a drain at home:
I. Medication
II. Corrosives
III. Juice
Answer:
Medication
Explanation:
These pharmaceuticals can pollute our water and unintentionally expose us to the chemicals in these medications. Recent studies have found that medicines flushed down the drain can contaminate our lakes and streams, which can hurt fish and other aquatic wildlife, and end up in our drinking water.
A world with both liquid water on its surface and carbon dioxide in its atmosphere is unstable because.
help me please this'll cost me half of my grade
The map shows four bodies of water. The graph shows the area of these bodies of water.
Question 1. Identify the units that should be used for the area of these bodies of water.
Question 2. Use the map to identify which body of water (A, B, C, or D) matches bar 3, and explain your answer.
Question 3. Explain what type of water(fresh or salt) is most likely in these bodies of water.
I'll put a picture of the map and the graph
Answer:
...
Explanation:
Explanation:
BECAUSE I DONT KNOW AS WELL CAN SOME ONE HELP.
HELP
Determine the empirical formula of a compound containing 48.38
grams of carbon, 6.74 grams of hydrogen, and 53.5 grams of oxygen.
In an experiment, the molar mass of the compound was determined to be 180.15 g/mol.
What is the molecular formula of the compound?
For both questions, show your work or explain how you determined the formulas by
giving specific values used in calculations.
Answer:
I recently answered this question. The response I submitted is included below. I beleive my answer should be correct.
Explanation:
Question 1:
C: 48.38g(1mol/12g) = 4.0317
H: 8.12g(1mol/1.01g) = 8.12
O: 53.5g(1mol/16g) = 3.34375
Divide by the smallest amount (3.34375)
C = 4.0317/3.34375 = 1.206 = 1
H = 8.12/3.34375 = 2.42 = 2
O = 3.34375/3.34375 = 1
Empirical formula = CH2O
Question 2:
Molecular formula = n(empirical formula)
n = molar mass (compound)/molar mass (empirical)
Empirical formula: CH2O
Molar mass of CH2O = 12 + 2x1 + 16 = 30 g/mol
Molar mass of compound: 180.15 g/mol
[tex]n = \frac{180.15g/mol}{30g/mol} = 6[/tex]
Molecular formula = C6H12O6
my teacher hasnt graded yet, but i got the same answer as the guy above. i did my best to explain the process for y'all if you genuinely don't understand/know how to do it. THE PROCESS IS VERY LONG, but youll get it eventually if i didnt help lol GOODLUCK
and yes, the molecular formula is C6H12O6
Two substances are combined and react. After 10 minutes, the chemical reaction has reached equilibrium. Which values would be equal to zero for the solution?
The extra conversion of concentration of reactant and product should be zero in order to attaining equlibrium state.
What is equilibrium?Chemical equilibrium refers to the state in which both the reactants and products are present in equal concentrations or amount. In equlibrium, same amount of reactant is converted into product and product into reactant.
So we can conclude that the extra conversion of concentration of reactant and product should be zero in order to attaining equlibrium state.
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