Answer:
CARBON 14 INCLUDES:
-six protons
-eight neutrons in the nucleus
CARBON 12 INCLUDES:
-six protons
-Six neutrons
what is the molarity of 0.40 mol of NaCI dissolved in 1.6 L of solution
Answer:.25 M
Explanation: .4mol/1.6L = .25 M
Answer:
8383idndjdjdje7i3jrbdu vying to get out the 3game in the
Explanation:
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Which statement about the relationship between laws, hypothesis, and theories is true?
The question is incomplete, the complete question is;
Which statement about the relationship between laws, hypotheses, and theories is true?
A.
Laws that remain true over an extended period of time are considered theories.
B.
A theory that holds true for a long time is considered a law.
C.
If a law is not contradicted after a lot of testing, it may be considered a hypothesis.
D.
If a hypothesis is not contradicted after a lot of testing, it may be considered a law.
Answer:
If a hypothesis is not contradicted after a lot of testing, it may be considered a law.
Explanation:
A hypothesis is an intelligent guess which is put forward to explain a particular scientific observation. Hypothesis are temporary explanations that must be subjected to rigorous scientific investigation.
If a hypothesis holds true for some time it is regarded as a theory. The theory is also subjected to further rigorous scientific experiments to see if it can be regarded as a law.
If the statement of the hypothesis is not contradicted after a lot of testing, it may be considered a law.
3. 78 mL of 2.5 M phosphoric acid is neutralized with 500 mL of potassium hydroxide. What is the
concentration of the base?
What area is affected by Earth’s gravitational field?
A gas occupies a volume of 584 mL at a pressure of 770 mm of Hg. When the pressure is changed, the volume becomes 603 mL If the temperature stays constant, what is the new pressure in mm of Hg?
Please help!!
Answer:
[tex]P_2=795mmHg[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to calculate the final pressure by using the Boyle's law as an inversely proportional relationship in pressure to volume at constant temperature:
[tex]\frac{P_2}{V_2} =\frac{P_1}{V_1}[/tex]
Thus, we solve for our target, P2, to obtain:
[tex]P_2=\frac{P_1V_2}{V_1} =\frac{770mmHg*603mL}{584mL}\\\\P_2=795mmHg[/tex]
Regards!
Possible interaction between oxygen molecule and water is ______________.
Answer:
Hydrogen Bonds
Explanation:
Opposite charges attract one another. The slight positive charges on the hydrogen atoms in a water molecule attract the slight negative charges on the oxygen atoms of other water molecules. This tiny force of attraction is called a hydrogen bond.
(c) If the student mixed 10 mL of distilled water with 10 mL of the sample, would this diluted solution have anabsorbance greater than, less than or equal to the absorbance of the original solution? Justify your answer.
Answer:
The diluted solution have an absorbance less than the original solution
Explanation:
As you can see in the graph, the absorbance of a substance is directly proportional to the concentration of the substance (Lambert-Beer law). That means a solution more concentrated than another will have an absorbannce greater than the more diluted solution.
In the problem, you are diluting the original sample by the addition of 10mL of distilled water, that means,
The diluted solution have an absorbance less than the original solutionState whether 0.1 M solutions of each of the following salts are acidic, basic, or neutral. Explain your reasoning for each by writing a balanced net ionic equation to describe the behavior of each nonneutral salt in water: NaCN, KNO3, NH4Cl, NaHCO3, and Na3PO4.
Answer:
1) NaCN is a basic salt
2) [tex]KNO_3[/tex] is a neutral salt
3) [tex]NH_4Cl[/tex] is an acidic salt
4) [tex]NaHCO_3[/tex] is a basic salt
5) [tex]Na_3PO_4[/tex] is a neutral salt
Explanation:
Salts are formed by the combination of an acid and a base. There are 3 types of salt:
Acidic salt: It is formed by the combination of strong acid and weak base.Basic salt: It is formed by the combination of a strong base and weak acid.Neutral salt: It is formed by the combination of strong acid and strong base or weak acid and weak base.For the given salts:
1) NaCN is a basic salt as it is formed by the combination of sodium hydroxide (strong base) and HCN (weak acid). The chemical equation for the hydrolysis of salt follows:
[tex]NaCN+H_2O\rightarrow NaOH+HCN[/tex]
As NaOH is released in the solution. Thus, it is a basic salt.
2) [tex]KNO_3[/tex] is a neutral salt as it is formed by the combination of potassium hydroxide (strong base) and nitric acid (strong acid).
3) [tex]NH_4Cl[/tex] is an acidic salt as it is formed by the combination of ammonium hydroxide (weak base) and HCl (strong acid). The chemical equation for the hydrolysis of salt follows:
[tex]NH_4Cl+H_2O\rightarrow NH_4OH+HCl[/tex]
As HCl is released in the solution. Thus, it is an acidic salt.
4) [tex]NaHCO_3[/tex] is a basic salt as it is formed by the combination of sodium hydroxide (strong base) and partial dissociation of carbonic acid (weak acid). The chemical equation for the hydrolysis of salt follows:
[tex]NaHCO_3+H_2O\rightarrow NaOH+H_2CO_3[/tex]
As NaOH is released in the solution. Thus, it is a basic salt.
5) [tex]Na_3PO_4[/tex] is a neutral salt as it is formed by the combination of sodium hydroxide (strong base) and phosphoric acid (strong acid).
SCIENCE
11. farmers tend to clear and bum a patch of forest area
Answer:
n8ce question and answer is time taken
which is generally more soluble in water ammonium chloride or potassium chloride explain
Answer:
Ammonium chloride
Explanation:
because is a salt which is highly soluble in water than potassium
express the measurement 4.22 quarts in the units of microliters
Answer:
[tex]3.99x10^6 \mu L[/tex]
Explanation:
Hello there!
In this case, for this units conversion problem, it turns out necessary to write the equivalence statement for liters and quarts as follows:
1 qt = 0.946353 L
Thus, the conversion set up turns out to be:
[tex]4.22qt*\frac{0.946353 L}{1qt} \\\\=3.99L[/tex]
Next, we convert to microliters as follows:
[tex]3.99L*\frac{1\mu L}{10^{-6}L}\\\\=3.99x10^6 \mu L[/tex]
Regards!
what is the name of this compund
Answer:
Ethyl ethanoate
Explanation:
To name the compound given above, we must:
1. Determine the functional group of the compound.
2. Determine the longest continuous carbon chain before the functional group and the longest continuous carbon chain after the functional.
3. Name the compound by naming the compound after the functional group followed by the compound before the functional group ending its name with
–oate.
Now, we shall determine the name of the compound as follow:
1. The compound is an ester with the functional group R'COOR.
Note: R' and R are alkyl groups which may be the same or different.
2. The longest continuous carbon chain before the functional group is 2 i.e ethane and the longest continuous carbon chain after the functional group is 2 i.e ethyl
3. The name of the compound after the functional group => ethyl.
The name of the compound before the functional group => ethane but the pressence of the two oxygen atoms makes it ethanoate.
Therefore, the name of the compound is Ethyl ethanoate
How many grams are in 3.7 moles of Na2O?
Answer:
mass = moles x molar mass
m= 3.7 x (23x2+16)
m= 3.7x62
m= 229.4g
198.4 grams are there is 3.7 moles of Na₂O.
The number of moles is defined as the ratio between given mass and molar mass.
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\[/tex]
Given:
Number of moles= 3.7 moles
To find:
Mass=?
Molar mass of Na₂O= 62 g/mol
Thus substituting the values in the given formula
[tex]\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}= 3.2 \text{moles}*62 \text{g/mol}\\\\\text{Given mass}=198.4 \text{g}[/tex]
Thus, 198.4 grams are there is 3.7 moles of Na₂O.
Learn more:
brainly.com/question/21911991
In the laboratory a student combines 47.8 mL of a 0.321 M aluminum nitrate solution with 21.8 mL of a 0.366 M aluminum iodide solution.
What is the final concentration of aluminum cation ?
M
Answer: The final concentration of aluminum cation is 0.335 M.
Explanation:
Given: [tex]V_{1}[/tex] = 47.8 mL (1 mL = 0.001 L) = 0.0478 L
[tex]M_{1}[/tex] = 0.321 M, [tex]V_{2}[/tex] = 21.8 mL = 0.0218 L, [tex]M_{2}[/tex] = 0.366 M
As concentration of a substance is the moles of solute divided by volume of solution.
Hence, concentration of aluminum cation is calculated as follows.
[tex][Al^{3+}] = \frac{M_{1}V_{1} + M_{2}V_{2}}{V_{1} + V_{2}}[/tex]
Substitute the values into above formula as follows.
[tex][Al^{3+}] = \frac{M_{1}V_{1} + M_{2}V_{2}}{V_{1} + V_{2}}\\= \frac{0.321 M \times 0.0478 L + 0.366 M \times 0.0218 L}{0.0478 L + 0.0218 L}\\= \frac{0.0153438 + 0.0079788}{0.0696}\\= 0.335 M[/tex]
Thus, we can conclude that the final concentration of aluminum cation is 0.335 M.
Suppose a current of 0.860A flows through a copper wire for 5.0 minutes. Calculate how many moles of electrons travel through the wire. Be sure your answer has the correct unit symbol and round your answer to 2 significant digits.
Answer:
2.7×10⁻³ mole
Explanation:
Applying
Q = it.............. Equation 1
Where Q = amount of charge, i = current, t = time
From the question,
Given: i = 0.860 A, t = 5 minutes = (5×60) seconds = 300 seconds
Subsitute these values into equation 1
Q = (0.860×300)
Q = 258 C
If one mole of electron has a charge of 96500 C
Then, x mole of electron will have a charge of 258 C
1 mole ⇒ 96500 C
X moles ⇒ 258 C
Solve for X
X = (258×1)/96500
X = 2.7×10⁻³ mole
Put the steps in order to show how crystals are formed.
Formation of ions:
Formation of crystals:
Formation of ionic bonds:
Formation of cubes:
This Should Be Your Answer:
Step 1: Formation of ions
Step 2: Formation of ionic bonds
Step 3: Formation of cubes
Step 4: Formation of crystals
I Hope This Helps? :)
Answer:
Black Cats?
Explanation:
Stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. Based on your data, is the newly discovered star a younger star? Explain your answer.
Answer:
Newly discovered star is a younger star
Explanation:
The composition of the newly discovered star is Hydrogen, Lithium, Neon, Sodium, Mercury
It consists of both hydrogen and helium of which the old stars are not made up of as they are heavier than the new stars.
Considering the above fact, it can be stated that the new star is a young star.
Answer:
A newly discovered star is a younger star because the composition of the newly discovered star is Hydrogen, Lithium, Neon, Sodium, and Mercury. And also further consists of both hydrogen and helium of which the old stars are not made up of, as they are heavier than the newer stars. And by considering that fact; it can be stated that the new star is a young star.
Explanation:
I did the lab
explain what variable is?
PLEASE FAST
Answer:
an element, feature, or factor that is liable to vary or change.
Sample of 200mls of 0.5 sulphuric acid,was asked to produce 1.2M of the new solution.Calculate the volume of the new solution
Answer: The volume of the new solution is 83.33 mL.
Explanation:
Given: [tex]V_{1}[/tex] = 200 mL, [tex]M_{1}[/tex] = 0.5 M
[tex]V_{2}[/tex] = ?, [tex]M_{2}[/tex] = 1.2 M
Formula used to calculate the volume of new solution is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\0.5 M \times 200 mL = 1.2 M \times V_{2}\\V_{2} = 83.33 mL[/tex]
Thus, we can conclude that volume of the new solution is 83.33 mL.
What is wrong with the statement below?
All chemicals are harmful to the environment in some way.
A. Chemicals may be harmful, helpful, or have little effect on the
environment.
B. Chemicals are not harmful to the environment unless they are
present in large amounts.
C. Chemicals are only helpful to the environment.
D. Chemicals do not affect the environment.
SUBMIT
How/why is maintaining healthy soil a social justice issue for our area and community
Answer:
Social justice aims to give individuals and groups fair treatment and an impartial share of social, environmental and economic benefits. The concept promotes the fair distribution of advantages and disadvantages within a society, regardless of background and status.
Environmental justice deals explicitly with the distribution of environmental benefits and the burdens people experience, at home, at work, or where they learn, play and spend leisure time. Environmental benefits include attractive and extensive greenspace, clean air and water, and investment in pollution abatement and landscape improvements. Environmental burdens include risks and hazards from industrial, transport-generated and municipal pollution.
Given the following set of atoms, write a bond-line formula for a possible constitutional isomer for the compound. Show all formal charges and lone pairs.C atoms H atoms Other3 6 2 Br atoms
Answer:
Explanation:
Isomers are compounds with the same molecular formula but chemically distinctive structures. Compounds that vary in connectivity, or how the component atoms are related to one another, are known as constitutional isomers. They have distinct functional groups and bonding patterns according to the sequence in which the atoms are linked together.
From the information given:
The compound given is C₃H₆Br₂ and the constitutional isomer of the compound can be seen in the image attached below.
The formal charges are calculated as follows:
Formal charge = valence electron - 1/2(bonding electron) - lone electron
For Br:
Formal charge = 7 - 1/2(2) - 6
Formal charge = 7 - 1 - 6 = 0
For C:
Formal charge = 4 - 1/2(8) - 0
Formal charge = 4 - 4 = 0
For H:
Formal charge = 1 - 1/2(2)
Formal charge = 1 - 1 = 0
What is the IUPAC name of the following compound?
Select one:
a. 4-methyl-3-phenyl-3-pentenoic acid
b. (Z)-3-methyl-2-phenyl-2-butenoic acid
c. 3-phenyl-2-methyl-2-penten-5-oic acid
d. 4,4-dimethyl-3-phenyl-3-butenoic acid
The image of the structure is attached in the image below.
Answer: The correct option is a.) 4-methyl-3-phenyl-3-pentenoic acid
Explanation:
Carboxylic acids are a type of functional group in organic chemistry that have the symbol '-COOH'. A suffix used for this functional group is '-oic acid'.
To name a compound, first look for the longest possible carbon chain.
As in the image attached below, the longest carbon chain has 5 carbon atoms. Thus, the prefix used will be 'pent-'
Also, a methyl substituent is present at the 4th position, a phenyl substituent is located at the 3rd position.
A double bond is also present at the 3rd position and a suffix '-ene' is used.
Hence, the IUPAC name for the given compound is 4-methyl-3-phenyl-3-pentenoic acid.
by acid-base reaction explain why thymol is sparingly soluble in water but soluble in 1M NaOH solution
Answer:
Sulphanilic acid is insoluble in both water as well as in acid because it can not form hydrogen bonding with the water molecule. But it is soluble in aqueous mineral acid like HF,HCl,HNO3 because they are able to form a hydrogen bond with mineral acids. Was this answer helpful?
Select two compounds below that can be used to make a buffer solution. Aacetic acid Bformate ion Csulfite ion Dcarbonate ion Eacetate ion Fhydrogen sulfide
Answer: Two compounds below that can be used to make a buffer solution are acetic acid and acetate ion.
Explanation:
A solution that helps in resisting change in pH when a small amount of acid or base is added to it is called a buffer solution.
A buffer solution consists of a mixture of weak acid and its conjugate base.
Acetic acid has a chemical formula [tex]CH_{3}COOH[/tex] and its conjugate base is [tex]CH_{3}COO^{-}[/tex].
This base is also called acetate ion.
Acetic acid is a weak acid because it dissociates weakly when added to a solvent like water.
Therefore, acetic acid and acetate ion will form a buffer solution.
Thus, we can conclude that two compounds below that can be used to make a buffer solution are acetic acid and acetate ion.
How many grams of gas must be released from a 32.0 L sample of CO2(g) at STP to reduce the volume to 16.6 L at STP?
Answer:
30.3 g
Explanation:
At STP, 1 mol of any gas will occupy 22.4 L.
With the information above in mind, we calculate how many moles are there in 32.0 L:
32.0 L ÷ 22.4 L/mol = 1.43 molThen we calculate how many moles would there be in 16.6 L:
16.6 L ÷ 22.4 L/mol = 0.741 molThe difference in moles is:
1.43 mol - 0.741 mol = 0.689 molFinally we convert 0.689 moles of CO₂ into grams, using its molar mass:
0.689 mol * 44 g/mol = 30.3 g10. What could the pH of a solution be if a cyanidin indicator turned blue? What is used to determine the endpoint of a titration? (Choose all that apply)
D 4
5
06
07
Answer:
The cyanidin indicator turns blue within a pH range of 5 - 7. The pH of the solution could be 5, 6 or 7.
An indicator is used to determine the endpoint of a titration.
Explanation:
Cyanidin indicator changes colour with each change in pH. In acidic solutions (pH < 7) cyanidin indicator will turn red, through to purple and blue, while in basic solutions (pH > 7), cyanidin indicator will change colour from aquamarine through to green and yellow. The cyanidin indicator turns blue within a pH range of 5 - 7.
Titration is a technique used in analytical chemistry to determine the unknown concentration of a solution. A solution of known concentration is added from a burette to the solution of unknown concentration until the reaction between the two solutions is complete. This known as the endpoint of the experiment. The endpoint of a titration is determined using an indicator which is added to reaction mixture. A colour charge is produced by the indicator at the endpoint of the reaction.
Note: An indicator is a dye of weak organic acids or bases which changes colour with changes in the pH of a solution. Some common indicators are methyl orange, methyl red, phenolphthalein, etc. These indicators are used to monitor the changes in the pH of solutions during a reaction.
Answer:
5,7,6
Explanation:
Took the quiz! Good luck!
What weight of barium chloride will react with 2.36g of sodium sulphate in solution so as to produce 3.88g of barium sulphate and 1.94g of sodium chloride in solution?
PLEASE give the answer faster
Answer:
3.46 g of BaCl2
Explanation:
The equation of the reaction is;
BaCl2(aq) + Na2SO4(aq) --------> 2NaCl(aq) + BaSO4(s)
Number of moles of barium sulphate produced = 3.88 g/233.38 g/mol = 0.0166 moles
From the reaction equation;
1 mole of BaCl2 yields 1 mole of barium sulphate
Hence 0.0166 moles of BaCl2 yields 0.0166 moles of barium sulphate
Hence;
Mass of BaCl2 required = 0.0166 moles × 208.23 g/mol = 3.46 g of BaCl2
Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 12.8 g of hydrochloric acid is mixed with 7.0 g of sodium hydroxide. Calculate the minimum mass of hydrochloric acid that could be left over by the chemical reaction. Round your answer to significant digits.
Answer:
Mass of HCl leftover = 6.4 g
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
NaOH + HCl —> NaCl + H₂O
Next, we shall determine the masses of NaOH and HCl that reacted from the balanced equation. This can be obtained as follow:
Mass of NaOH = 23 + 16 + 1
= 40 g/mol
Mass of NaOH from the balanced equation = 1 × 40 = 40 g
Molar mass of HCl = 1 + 35.5 = 36.5 g/mol
Mass of HCl from the balanced equation = 1 × 36.5 = 36.5 g
SUMMARY:
From the balanced equation above,
40 g of NaOH reacted with 36.5 g of HCl.
Next, we shall determine the mass of HCl required to react with 7 g of NaOH. This can be obtained as follow:
From the balanced equation above,
40 g of NaOH reacted with 36.5 g of HCl.
Therefore, 7 g of NaOH will react with = (7 × 36.5)/40 = 6.4 g of HCl.
Thus, 6.4 g of HCl is required for the reaction.
Finally, we shall determine the leftover mass of HCl. This can be obtained as follow:
Mass of HCl given = 12.8 g
Mass of HCl that reacted = 6.4 g
Mass of HCl leftover =?
Mass of HCl leftover = (Mass of HCl given) – (Mass of HCl that reacted)
Mass of HCl leftover = 12.8 – 6.4
Mass of HCl leftover = 6.4 g
formula for dicyanoargentate (I) ion
Answer:
Potassium dicyanoargentate(I) | C2AgKN2 - PubChem.
Synonyms: Potassium dicyanoargentate(I)pota...
Molecular Formula: C2AgKN2
Explanation: