Answer:
a
Explanation:
it will help stop frictoin
* 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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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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Balance the chemical equation
Explanation:
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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:
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.
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.
Consider the following reaction in which all reactants and products are gases.
P4+6Cl2⟶4PCl3
A 100. ML reactor vessel is charged with 250. Mg of P4 and 4. 21 atm of Cl2 at 298 K. The reaction goes to completion.
How many moles of chlorine gas are initially in the vessel?
Based on the equation of the reaction, the moles of chlorine gas initially in the vessel is 0.12 moles
How many moles of chlorine were initially present?The moles of chlorine initially present is determined using the equation of the reaction:
P4 + 6 Cl2 ⟶ 4 PCl3At STP, 1 mole of P4 reacts with 6 moles of chlorine.
Molar mass of P4 = 124.0 g
Molar mass of chlorine = 71.0 g
Mass of P4 in reaction vessel = 250 mg = 0.25g
moles of P4 in 0.25 g = 0.25/124 = 0.02 moles
0.02 moles of P4 will react with 0.02 × 6 moles of chlorine = 0.12 moles of chlorine.
Therefore, the moles of chlorine gas initially in the vessel is 0.12 moles.
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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.
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.
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
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
Which of the following best illustrates a natural process acting as a constructive force
Answer:
Wind depositing sand to build up sand dunes.
Explanation:
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
what is a metal with 20 protons?
Answer: Calcium
Hope this helps
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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How do I find the pH of two different solutions if they have the same number of moles?
Answer:
You can use a PH tester do identify the PH of each solution. Depending on what solutions ur testing, u shouldn't mix them as for there could be either a minor or bad chemical reaction
Explanation:
Why wasn’t sodium hydroxide used in the synthesis of divanillyl oxalate, instead of triethylamine?
Sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base.
What is sodium hydroxide?It should be noted that sodium hydroxide simply means a corrosive cystaline solid which readily absorbs moisture until it dissolves.
In this case, sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base and will decrease the yield of the product.
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Divanillyl oxalate is a chemical that is produced by triethylamine. Sodium hydroxide is not used in its synthesis as it is a strong base.
What is sodium hydroxide?Sodium hydroxide or caustic soda is an ionic compound with ions of sodium and hydroxide. The formula is shown as, [tex]\rm NaOH[/tex]. It is crystalline and absorbs moisture from the surrounding.
It is not used in the synthesis of divanillyl oxalate as it is a strong base with pH 14 that affects the yield of the product in the reaction.
Therefore, sodium hydroxide is not used in the synthesis reaction.
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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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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
which of these elements has the smallest atomic radius
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.
Classify the following substituents according to whether they are electron donors or electron acceptors relative to hydrogen by the resonance and the inductive mechanisms
Species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.
What is resonance?The term resonace has to do with the movement of electron pairs in a molecule. Inductive effects has to do with the drawing of electron density towards an atom or bond.
The two effects depends on the nature of a substituent. For instance, species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.
The question is incomplete hence the exact nature of the substituents can not be determined.
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In resonance, the species with lone pairs donate electrons while the substituent takes electrons away from another species when deficient by resonance.
What is the Inductive and resonance effect?When the electron donor or the withdrawal groups creates the electron density on the molecule then it is called the inductive effect. This results in the creation of permanent dipoles in the bonds of the molecules.
Atom attached to a benzene molecule with higher electronegativity than hydrogen atom then, it will be an acceptor while with lower electronegativity will be a donor.
The movement of the electron pair like lone pair and pi bond in a molecule by the delocalization is called the resonance effect. The electron donation and acceptance depend on the nature of the substituent molecule.
If the atom attached to the benzene molecule is electron-rich, it will be a donor, while the electron-deficient will accept the electron by the method of resonance effect.
Therefore, the nature of the substituent determines the resonance and the inductive effect.
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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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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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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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One mole of copper atoms is 6.02 x 1023 copper atoms.
True or false?
Answer:
Explanation:
The relation between molecular (formula) mass and molar mass page 44 . To obtain one mole of copper atoms (6.20 x 1023 ne atoms) weigh out 63.55 g copper. The molar mass (M) of a substance is the mass of one mole of entities (atoms, molecules, or formula units) of the substance.
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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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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Answer this question
Answer:
1.312788 atm
Explanation:
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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