The natural abundance of each isotope of lithium:
For \(^{6} Li\) = 7.5%
For \(^{7} Li\) = 92.5%
Due to the fact that lithium only has two stable isotopes, it follows that only two isotopes contribute to its average atomic mass.
Then, if we take x the proportional abundance of \(^{6} Li\) it is possible to state that the decimal abundance of \(^{7} Li\) need to be equivalent to 1−x.
Lithium's typical atomic mass will now be equal to =
avg. Atomic weight Li = Atomic weight of \(^{6} Li\)× quantile abundance of \(^{6} Li\)+ Atomic weight of \(^{7} Li\)× quantile abundance of \(^{7} Li\)
Since you are aware that the average atomic mass of lithium is
6.941 you can construct the equation as follows.
6.941 = 6.015 × x + 7.016 × (1-x)
x = 0.075
This is the decimal abundance of \(^{6} Li\). The decimal abundance of \(^{7} Li\) is 1 - 0.075 = 0.925.
Percent abundances :
For \(^{6} Li\) = 7.5%
For \(^{7} Li\) = 92.5%
Learn more about isotope of lithium here;
https://brainly.com/question/11919522
#SPJ4
what does the first ionization energy represent?
A. the energy required to add an electron
B. the energy to remove an energy level of electrons
C. the energy required to remove an electron from an atom
D. the energy given off when an electron is gained
The first ionization energy represents Option C. the energy required to remove an electron from an atom.
The ionization energy is defined as the energy required to remove an electron from a gaseous atom or ion to form a cation that carries a charge of +1.Ionization energy is an essential property of an element, and it is determined by the effective nuclear charge (Zeff) and the distance between the valence electrons and the nucleus. The effective nuclear charge is the positive charge that an electron experiences from the nucleus.
The closer the valence electrons are to the nucleus, the greater the effective nuclear charge, making it more challenging to remove an electron from the atom. The ionization energy increases from left to right and from bottom to top across the periodic table. The ionization energy decreases from top to bottom and from right to left across the periodic table. The reason for this trend is the increase in atomic radius and the decrease in effective nuclear charge from top to bottom and from right to left on the periodic table.
Ionization energy plays a significant role in chemical reactions, particularly in redox reactions. The energy required to remove an electron from an atom or ion is equivalent to the energy released when the ion or atom gains an electron. A high ionization energy indicates that the atom is less reactive and more stable since it requires a lot of energy to remove an electron. Therefore the correct option is C
Know more about ionization energy here:
https://brainly.com/question/20658080
#SPJ8
C + H2O → CO + H2
What is the starting substance?
Answer:
Explanation:
Carbon and water = carbon dioxide and hydrogen
characteristics. of. rusting
Answer: metal turn orange and weaker as it gets oxidised
Explanation:
What pair of properties do all solids have?
Answer:
Has definite shape and volume
Solids have high melting point
Explanation:
Give the balanced equation for barium reacting with aqueous aluminum nitrate. Be sure to include state symbols in this reaction.
Answer:
The balanced equation for barium reacting with aqueous aluminum nitrate can be written as:
Ba + 2 Al(NO3)3 → Ba(NO3)2 + 2 Al
(Note: state symbols indicate the physical state of each substance in the reaction. In this case, "Ba" and "Al" are solids, while "Al(NO3)3" and "Ba(NO3)2" are aqueous solutions.)
Which base(s) is weaker than ammonia?
hydroxylamine, methylamine, and pyridine
pyridine only
hydroxylamine and methylamine
hydroxylamine and pyridine
Answer:
Hydroxylamine and pyridine
Explanation:
Just did it
A balloon is filled with 500.0 mL of helium at a temperature of 27 degrees Celsius and 755 mmHg. What volume in milliliters will it have when it reaches an altitude where the temperature is -33 degree Celsius and the pressure is 0.65 atm?
A balloon is filled with 500.0 mL of helium at a temperature of 27 degrees Celsius and 755 mmHg. 3.4 liters is the volume in milliliters will it have when it reaches an altitude where the temperature is -33 degree Celsius and the pressure is 0.65 atm.
A measurement of three-dimensional space is volume. It is frequently expressed in numerical form using SI-derived units or different imperial or US-standard units (such the gallon, quart, and cubic inch). Volume and length (cubed) have a symbiotic relationship.
The volume much a container is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the volume of fluid (liquid or gas) that the container may hold.
PV/T = constant
(755 x 500) / (27 + 273) = (494 x V) / (-33 + 273)
V = 3396 ml = 3.4 liters
To know more about volume, here:
https://brainly.com/question/1578538
#SPJ1
What is the mass of a baby (in grams) if the babies weight is 6 lbs. 6 oz?
what mass of calcium chloride will be produced from 3.750 moles of hcl reacting with ca(oh)2
Answer:
208.125g
Explanation:
Given parameters:
Number of moles of HCl = 3.75moles
Unknown:
Mass of CaCl₂ that will be produced = ?
Solution:
The reaction equation is given as:
2HCl + Ca(OH)₂ → CaCl₂ + 2H₂O
Now, to find the mass of CaCl₂, we have to work from the known to the unknown.
The known specie here is the number of moles of HCl;
2 mole of HCl will produce 1 mole of CaCl₂
3.75moles of HCl will produce \(\frac{3.75}{2}\) = 1.875moles
The mass of CaCl₂;
Mass of CaCl₂ = number of moles of CaCl₂ x molar mass
Molar mass of CaCl₂ = 40 + 2(35.5) = 111g/mol
Mass of CaCl₂ = 1.875 x 111 = 208.125g
Langbeinite- K2Mg2(SO4)3 - is a sulfate mineral. Write a chemical reaction for the congruent dissolution of langbeinite and calculate the ΔGR for the reaction.
Ibuprofen can be found in 800 mg doses in over-the-counter analgesics, such as Advil and Motrin. How many grams of iburofen
does such a tablet contain?
800 mg =
g
The grams of iburofen does such a tablet contain 800 mg = 0.8g Ibuprofen
1 g = 10^-3g = .001g
Ibuprofen has 800 mg doses in over-the-counter analgesic
800g = 800 × .001
= 0.8g
Ibuprofen is Nondteriodal Anti-inflammatory Drug (NSAID)Ibuprofen's Mechanism of Action is Decreases inflammation, pain, and fever through inhibition of cyclooxygenase activity and prostaglandin synthesisnonsteroidal anti-inflammatory medication (NSAID) used for pain relief and to reduce fever by stops inflammation and by blocking formation of cyclo-oxygenase (COX-2) a chemical mediator of inflammatory chemicals. i.e prostaglandinsIt comes under the Class analgesic (reduce pain) and antipyretic (FIRE - reduce fever)e side effects of ibuprofen NSAID are peripheral edema, fluid retention with edema, tinnitus, purpura, petechiae, anorexia, diarrhea, rash, nausea, vomiting, fatigue, dizziness, lightheadedness, anxiety, confusionTo know more about analgesic visit :
https://brainly.com/question/2189504
#SPJ9
What keeps electrons from drifting away from the nucleus in an
atom?
Answer: The electrons are attached to the positive nucleus.
The electrons are attached to the positive nucleus.
What are the functions of electrons?The electron is a subatomic particle with a negative one elementary electric charge. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles.
The primary function of the electron transport chain is to generate an electrochemical gradient. It drives the synthesis of ATP during cellular respiration and photosynthesis in mitochondria and chloroplasts, respectively.
Electrons play an essential role in numerous physical phenomena, such as electricity, magnetism, chemistry and thermal conductivity, and they also participate in gravitational, electromagnetic and weak interactions.
Learn more about electrons:
https://brainly.com/question/1255220
#SPJ2
How do rockets work? What chemicals are used and what reactions happens with those chemicals to make a rocket fly?
Answer:
Chemical rocket engines use a fuel (something to burn) and an oxidiser (something to react with the fuel). ... As the propellant reacts inside a combustion chamber, the chemical reaction produces hot gases. It is the ejection of these rapidly expanding hot gases at high speed from the rocket nozzle that
( I found this on a website called Science Learning. Full credit to them and their work. Check it out for more information)
Given 2.37 mol of calcium, how much (in g) would it weigh? Include the proper units
and significant digits.
Element Rand Element Q have the same number of valence
electrons. These elements both have similar chemical behavior, but
Element R has fewer energy levels than Element Q. Which statement best
describes the positions of the two elements in the periodic table?
I know I'm answering super late, but I just want to help others who don't know the answer
Answer:
H. The two elements are in the same group, with Element R just above Element Q.
Explanation:
When answering a question like this, I would highly recommended using a periodic table. I used a periodic table to find the answer to the question.
Which ecosystem is the least stable?
A. A rain forest
B. A cornfield
C. A savanna
D. A coral reef
The transfer of heat by electromagnetic waves *
O Conduction
O Convection
O Radiation
Answer:
radiation
Explanation:
hope this helps!
A mass of 1.71 g pure barium hydroxide is transferred quantitatively to a 250 cm3
volumetric flask and made up to the mark with distilled water. Using a pipette, 25.0 cm3
of the barium hydroxide solution are placed in a conical flask and a few drops of methyl
orange indicator are added. Hydrochloric acid is added slowly from a burette until the
endpoint is reached. The titre value is 12.6 cm3
What will the colour change of the indicator at the endpoint be?
The methyl orange indicator will change from red to yellow at the titration's endpoint.
How can the color of the indicator's change at the terminus be determined?An acid-base indicator called methyl orange changes color between the pH ranges of 3.1 and 4.4. In acidic and basic solutions it is red and yellow, respectively
In this instance, an acid, hydrochloric acid, is being used to titrate the barium hydroxide solution. The pH of the solution will fall as we add the acid since it will neutralize the base. The hue of the methyl orange indicator will vary when the pH ranges from 3.1 to 4.4
All of the barium hydroxide will have interacted with the hydrochloric acid by the time the titration is complete leaving a neutral solution. When the methyl orange indicator becomes yellow the solution's pH is in the basic range.
Therefore, the methyl orange indicator will change from red to yellow at the titration's endpoint.
Learn more about acid-base indicator here: brainly.com/question/1918667
#SPJ1
Which sample contains the largest number of oxygen atoms? Select one: a. 8.0 g of carbon dioxide b. 8.0 g of potassium chlorate c. 8.0 g of calcium perchlorate d. 8.0 g of sodium hydroxide
The sample with the largest number of oxygen atoms will be calcium perchlorate.
Number of atoms in a compoundSince we are not looking at the number of moles, the mass of the compounds has no bearing on the number of atoms of oxygen.
The chemical formula for carbon dioxide is \(CO_2\). Thus, it has 2 atoms of oxygen.The chemical formula for potassium chlorate is \(KClO_3\). Thus, it has 3 oxygen atoms.The chemical formula for calcium perchlorate is \(Ca(ClO_4)_2\). Thus, it has 8 atoms of oxygen.The chemical formula for sodium hydroxide is NaOH. Thus, it has 1 atom of oxygen.Therefore, the compound with the largest number of oxygen atoms is calcium perchlorate.
More on the number of atoms in compounds can be found here: https://brainly.com/question/1686912
#SPJ1
Do you think science will end the world or save the world or do neither?
Answer:
This is all up to you
Explanation: This question is up to you because you may think both or just one.
What are the coefficients when the following equations are balanced? sb o2 --> sb4o6 h2s cl2 --> s8 hcl
The balanced reaction with correct coefficients for the given chemical reaction is given as,
4Sb + 3O₂ → Sb₄O₆
H₂S + Cl₂ → S + 2HCl
Balanced chemical equations are defined as the equations that have the same number and type of each atom on both sides of the equation. The coefficients in a balanced equation must be in the simplest whole number ratio. In a balanced chemical equation mass is always conserved.
The equation Sb + O₂ → Sb₄O₆ is written after balancing as 4Sb + 3O₂ → Sb₄O₆. Therefore, its coefficients are 4 and 3.
The equation H₂S + Cl₂ → S + HCl is written after balancing as H₂S + Cl₂ → S + 2HCl. Therefore, its coefficient is 2.
Learn more about balanced chemical reaction from the link given below.
https://brainly.com/question/7519996
#SPJ4
Which geological process occurs over the longest time scale?
Select one:
Earthquakes
Volcanic eruptions
Weathering
Landslides
Answer: weathering
Explanation: It is slowly by wind or by water
Is A fireplace poker glows red when you heat it in the fire a Chemical or
Physical change?
A fireplace poker glowing red when you heat it in the fire is referred to as a physical change.
What is Physical change?This change is a reversible one in the physical properties of a substance such as the size, color etc. Physical change doesn't alter or change the chemical composition of a substance and no new products are formed in this process.
A fireplace poker glowing red when you heat it in the fire doesn't change the composition and is reversible when allowed to cool down which is why physical change was chosen as the most appropriate choice.
Read more about Physical change here https://brainly.com/question/17609067
#SPJ1
supposing on a hypothetical garden 43 identical trees contains a total of 19565 leaves. if each branch on a given tree consist of 35 leaves how many branches does each tree have?
Answer:
13 branches/tree
Explanation:
Step 1: Given data
Total number of trees (t): 43 treesTotal number of leaves (l): 19565 leavesNumber of leaves per branch (l/b): 35 leaves/branchStep 2: Calculate the total number of branches (b)
We will use the following expression.
b = l × b/l
b = 19565 leaves × 1 branch/35 leaves = 559 branch
Step 3: Calculate the number of branches per tree (b/t)
We will divide the total number of branches by the total number of trees.
559 branches/43 trees = 13 branches/tree
Help !!A student examines a picture of an important biological molecule in a textbook and writes four statements about the molecule in a chart
1. The molecule is found in the nucleus,
2. The molecule is made up of chromosomes.
3. The molecule carries genetic information.
4. The molecule contains genes.
Which statement needs to be revised to make it true? statement 1 statement 2 statement 3 statement 4
Answer:
Statement 2 (The molecule is made up of chromosomes)
Explanation:
This question is describing DNA, as the biological molecule. DNA is a type of nucleic acid that functions in the storage of genetic information in the cell. This means that contained in the DNA, are segments that code for proteins called GENES. It is contained in the nucleus of eukaryotic cells where it is wrapped around structures called CHROMOSOMES.
BASED on the four statements given by the student, which happens to be characteristics of this molecule, the statement 2, which states that the molecule is made up of chromosomes needs to be revised to make it true. This is because DNA is not made up of chromosomes but rather DNA is contained in chromosomes.
Michelle is trying to find the average atomic mass of a sample of an unknown
element. She finds that her sample contains 59.34% of an isotope with a mass of
113.6459, while the rest of the sample is an isotope with a mass of 115.8488. What
is the average atomic mass of her sample? Please round your answer to 0.01 amu.
The average atomic mass of her sample is 114.54 amu
Let the 1st isotope be A
Let the 2nd isotope be B
From the question given above, the following data were obtained:
Abundance of isotope A (A%) = 59.34% Mass of isotope A = 113.6459 amuMass of isotope B = 115.8488 amuAbundance of isotope B (B%) = 100 – 59.34 = 40.66%Average atomic mass =?The average atomic mass of the sample can be obtained as follow:
\(Average \: atomic \: mass \: = \frac{mass \: of \: A \times A\%}{100} + \frac{mass \: of \: B \times B\%}{100} \\ \\ Average \: atomic \: mass \: = \frac{113.6459\times 59.34}{100} + \frac{115.8488\times 40.66}{100} \\ \\ Average \: atomic \: mass \: = 114.54 \: amu \\ \\ \)
Thus, the average atomic mass of the sample is 114.54 amu
Learn more about isotope: https://brainly.com/question/25868336
What is the mass of 3.99 mol of nickel?
Answer:
234.213
Explanation:
Moles of Nickel x 58.70 = Grams
3.99 x 58.70 = 234.213
What is the function of mitochondria in plant and animal cells?
A
It receives and removes wastes.
B
It functions in making RNA and DNA.
C
It is the location of cellular respiration and produces ATP.
D
It provides a barrier between the inside and the outside of the cell.
What's galactose's empirical formula?
Answer:
C6H12O6
Explanation:
C6H12O6
which factor is most responsible for the fact that water is a liquid rather than a gas at room temperature
The answer is Hydrogyn bonding. It keeps the water molocules bonded together and in a liquid state, without it it'd be in a gashious state.
Answer:Hydrogen bonds keep them together in room temperature, hope this helps!
Explanation:
<!> Brainliest is appreciated! <!>