Answer:
B. the number of neutrons in the nucleus
Explanation:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons
Answer:
the number of neutrons in the nucleus
Explanation:
What is the chemical formula for the compound formed between cobalt (iii) and borate ion?
Answer:
Cobalt(III) Borate CoBO3 Molecular Weight -- EndMemo.
Explanation:
Initially, 0.880 mol of A is present in a 3.00 L solution.
2A(aq)↽−−⇀2B(aq)+C(aq)
At equilibrium, 0.150 mol of C is present. Calculate K.
The equilibrium constant is 0.026.
What is the equilibrium constant of the reaction?Let us recall that the equilibrium constant is a number that shows us the extent to which reactants are converted into products. In other words, a large positive value of the equilibrium constant indicates that most of the reactants have been converted into products.
Initial concentration of A = 0.880 mol /3.00 L = 0.29 M
Equilibrium concentration of C = 0.150 mol /3.00 L = 0.05 M
We can set up the ICE table thus;
2A(aq) ⇄ 2B(aq) + C(aq)
I 0.29 M 0 0
C -2x +2x +x
E 0.29 - 2x 2x 0.05 M
Where
x = 0.05
At equilibrium;
[A] = 0.29 - 2(0.05 ) = 0.19 M
[B] = 2(0.05) = 0.1 M
[C] = 0.05 M
K = [B] [C] /[A]
K = 0.1 * 0.05/ 0.19
K = 0.026
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Dr. R needs to make 153 mL of a 1.25 M solution of ZrCl2. What mass of ZrCl2 is needed to prepare this solution?
The mass of ZrCl₂ needed to prepare the solution, given the data is 30.98 g
How to determine the mole of ZrCl₂We'll begin by obtaining the mole of ZrCl₂. This can be obatined as follow:
Volume = 153 mL = 153 / 1000 = 0.153 LMolarity = 1.25 MMole of ZrCl₂ =?Mole = Molarity x Volume
Mole of ZrCl₂ = 1.25 × 0.153
Mole of ZrCl₂ = 0.191 mole
How to determine the mass of ZrCl₂ neededWe can obtain the mass of ZrCl₂ needed to prepare the solution as follo:
Molar mass of ZrCl₂ = 91.22 + (35.5 × 2) = 162.22 g/molMole of ZrCl₂ = 0.191 mole Mass of ZrCl₂ =?Mass = mole × molar mass
Mass of ZrCl₂ = 0.191 × 162.22
Mass of ZrCl₂ = 30.98 g
Thus, the mass of ZrCl₂ needed to prepare the solution is 30.98 g
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composed of proton/s, neutron/s and electron/s
Answer:
Atoms
Explanation:
Atoms are made of extremely tiny particles called protons, neutrons, and electrons. Protons and neutrons are in the center of the atom, making up the nucleus. Electrons surround the nucleus. Protons have a positive charge.
could chuck could chuck wood chuck?
The densities of zinc, chromium and iron are 7.89, 7.20 and 7.86 g/cm³, respectively. A
metal with a volume of 12.3mL has a mass of 96.7g. What is this metal? Remember that
1 cm³ is the same as 1 ml
Taking into account the definition of density, the metal with a volume of 12.3 mL and a mass of 96.7 g is iron.
Definition of densityDensity is defined as the property of matter, whether solid, liquid, or gas, that allows the amount of mass in a given volume of a substance to be measured.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Density in this caseIn this case, you know that:
Mass= 96.7 gVolume= 12.3 mL= 12.3 cm³ (being 1 mL= 1 cm³)Replacing in the definition of density:
density= 96.7 g÷ 12.3 cm³
Solving:
density= 7.86 g/cm³
On the other hand, you know that the densities of zinc, chromium and iron are 7.89, 7.20 and 7.86 g/cm³, respectively.
Finally, the metal with a volume of 12.3 mL and a mass of 96.7 g is iron.
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Ice has a density of 0.92g/cm3. It will float in water.
The density of pure water is 1 g/cm^3.
Its density is 0.98 g cm 3 at room temperature, in comparison with the handiest zero.92 g cm 3 for ice, a reality that has to be defined through atomic, and molecular concepts. If ice has been no longer much less dense than water, it might sink, having a devastating impact on lake backside ecosystems. believe it or now not, ice is honestly about 9% much less dense than water. for the reason that water is heavier, it displaces the lighter ice, causing the ice to glide to the pinnacle.
The density of ice is about 90 percent that of water, but that could range because ice can contain air, too. meaning that about 10 percent of an ice cube or iceberg will be above the water line. The density of water is maximum at four∘C, and the density of the ice is much less than the water due to its susceptible intermolecular pressure of attraction. as the density of water is more, it's miles heavier than ice. therefore ice floats on the floor of the water. Ice continually floats due to the fact it's far less dense than everyday water. because frozen water molecules shape a crystal.
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Common table salt is 39.3 % sodium by mass. What mass of table salt
provides the upper safe limit in the recommended daily requirement of sodium
which is 2300. mg?
5.845 mg of table salt provides the upper safe limit in the recommended daily requirement of sodium.
How to calculate mass percent of sodium?Molar mass of common table salt that is sodium chloride is 23.0+35.5=58.5 g/mole which is the addition of molar masses of sodium and chlorine,the constituents of sodium chloride.
As the common table salt is 39.3% sodium by mass therefore it has 23.01975 g or 23019.75 mg of sodium.
39.3/100×58.5=23019.75
As 58.5 g of sodium chloride has 23.019 g of sodium therefore 2.3 g of sodium is present in 5.845 g, which is 5.845×10[tex]^-3[/tex]mg.
2.3×58.5/23.019=5.845 mg.
Mass percent of any compound is usually calculated as mass of the compound divided by it's total mass and then multiplied by hundred.It is a way of expressing concentration of a component.It describes how much solute is present in 100 grams of solution.
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1.Differences between ions and charge??
Scrub all right, had to drink a poisonous substances that paralyzes body resulting in death what is most likely the exclamation for how the substance produced paralysis
The body's muscles become increasingly paralyzed as a result of tetrodotoxin's interference with the signaling process from nerves to muscles. Toxic exposure to tetrodotoxin may be lethal.
Scrub all right, had to drink a poisonous substances that paralyzes body resulting in death.
What is most likely the exclamation for how the substance produced paralysis?
Tetrodotoxin (TTX), a neurotoxin, is extremely poisonous.
Tetrodotoxin is a sodium channel blocker. It stops neurons from firing action potentials by clinging to the voltage-gated sodium channels in nerve cell membranes and obstructing sodium ions from entering the neuron, which are crucial for an action potential's rising phase.
Due to the neurological system's inability to communicate, muscles are unable to contract in response to nerve inputs. It works by selectively blocking sodium channels.
The majority of its occurrences are in the livers and sex organs of several fish species, such as puffer fish, globefish, and toadfish (order Tetraodontiformes) (gonads).
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the mass of a single tantalum atom is 3.01x10^-22 grams. how many tantalum atoms would there be in 119 milligrams of tantalum?
Answer:
7.51
×
10
24
The density
ρ
of a sample is its ratio of mass
m
to volume
V
:
ρ
=
m
V
.
To find the number of atoms in this sample, first multiply the volume by the density to get the mass. Then divide this mass by the mass of one atom.
133
c
m
3
T
a
(
17.0
g
1
c
m
3
)
(
1
atom
T
a
3.01
×
10
−
22
g
T
a
)
=
7.51
×
10
24
Ta atoms
? Question
Open the Forces box and select Total Force. Also, select Slow Motion at the bottom of the screen. Watch the force arrows
in the centers of the atoms. When do the atoms attract one another, and when do they repel?
Drag the tiles to the boxes to form correct pairs.
Tiles
Pairs
atoms attract each other
atoms repel each other
when atoms close in and overlap each other
when atoms lie separated from each other
US 122
When atoms close in and overlap each other; atoms repel each other. When atoms lie separated from each other; atoms attract each other
According to the theory of valence bonds, a covalent bond is made up of two atoms that are joined together and produce a pair of electrons that are shared by both of their bonded atomic orbitals. When a portion of one orbital and a portion of a second orbital occupy the same region of space on two separate atoms, we say that their orbitals overlap. The valence bond theory states that a covalent bond forms when two circumstances are true:
1. orbital on one atom overlaps another, and two solitary electrons in each orbital come together to form an electron pair.
2. atoms are physically connected by a force known as a covalent bond thanks to the attraction between this negatively charged electron pair and the positively charged nuclei of the two constituents. The degree of orbital overlap determines how strong a covalent bond will be. Stronger bonds are created by orbitals with more broad orbital overlap than by those with less overlap.
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How many electrons must each atom gain or lose to acquire an electron configuration identical to the noble gas nearest to it in atomic number?
Li lose one electron to acquire an electronic configuration. I must accept one electron, N accept three electron and Al lose three electron to acquire noble gas electronic configuration.
For Li,
Li belongs to first group of the periodic table and have 3 as atomic number. So, it lose one electron to acquire stable electronic configuration like as Helium.
For I,
I belongs to 17th group of the periodic table and have 53 as atomic number. So, it accept one electron to acquire stable electronic configuration like as Xenon.
For N,
N belongs to 15th group of the periodic table and have 7 as atomic number. So, it gain three electron to acquire stable electronic configuration like as Neon.
For Al,
Al belongs to 3rd group of the periodic table and have 13 as atomic number. So, it lose three electron to acquire stable electronic configuration like as Neon.
Thus, we concluded that Li lose one electron to acquire an electronic configuration. I must accept one electron, N accept three electron and Al lose three electron to acquire noble gas electronic configuration.
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The facts you find in reference source that support your data in an experiment
The facts you find in reference source that support your data in an experiment is known to be called research.
What is known to be a research?Research is known to be a term that is defined as as a kind of "creative and methodical form of activity done to improve the body of knowledge.
It entails the objective gathering, organizing, and analysis of data in order to improve comprehension of a subject or issue.
The Research is described as the thoughtful analysis of studies pertaining to a certain issue or problem utilizing scientific methodologies.
Therefore, since Research is a methodical inquiry, one can say that he facts that you find in reference source that support your data in an experiment is known to be called research.
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Write a net ionic equation for the reaction that occurs when aqueous solutions of potassium hydroxide and perchloric acid are combined
The net ionic equation of potassium hydroxide and perchloric acid combined in aqueous solutions is
H⁺ + OH⁺ → H₂O
How to write a net ionic equation?Step 1: Complete the equation, write the correct chemical formula for each compound both in reactant and product
Step 2: Separate the compounds in ionic form.
Step 3: Stike out the common element in the product and the reactant side.
Demonstration: KOH (aq) + HCLO₄ (aq) → KCLO₄(aq) + H₂O(lq)
Total ionic equation: K⁺ + OH⁻ + H⁺ + CLO₄ → K⁺ + CLO₄ + H₂O
Net ionic equation: H⁺ + OH⁻ → H₂O
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What is atomic radius and how is this value obtained
Answer:
Atomic radius is the radius of an atom. It can be attained through measuring the radius of an atom in a variety of bonds and averaging them to get it.
Explanation:
What is the correct IUPAC name for 3,3,4-Trimethylpentane
Four research teams measured the rotation period of a newly detected neutron star, and what each team wrote in its team notebook is shown in the
table below.
Suppose a later and more reliable measurement gives 0.500 s for the period of the same star. Decide which of the earlier measurements was the most
accurate, and which was the most precise.
team
what was written
in the notebook
"between 0.516s and 0.524s"
"0.46s 4.0%"
"0.540s 0.002s"
"0.51s"
The accurate measurement is 0.51s and precise one is 0.516 s to 0.524 s.
We have acquired a sense of measurement through millions of years of living because measurement is necessary for us to comprehend the outside world. Tools that supply scientists with a quantity are needed for measurements. The issue here is that there is some uncertainty in every measurement made with any measuring device.Accuracy is the capacity of an instrument to measure the precise value. In other words, it refers to how closely the measured value resembles a reference or genuine value.The precision of a substance is defined as the degree to which two or more measurements agree with one another.0.51 is accurate measurement because this value is more closer to 0.500 s compared to other given options.
The measurement of 0.516 and 0.524 must have taken from highly precised instrument because it is capable of making measurement upto 3 decimal place.
Hence 0.516s and 0.524s is most precise team.
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(b)Diborane, B₂H6, can be prepared by the following reaction:
NaBH4 (s) + BF3(g) B₂Hs(g) + NaBF4(s)
i. Balance the equation
ii. How many moles of NaBH, react with 1.299 mol of BF3?
iii.How many moles of B₂H, can be obtained from 0.893 mol of NaBH₂?
iv. If 1.987 mol of B₂H, is obtained, how many moles of NaBF, are produced?
[7 marks]
First we will balance the given equation:
NaBH4 (s) + BF3(g) B₂H6(g) + NaBF4(s)
The addition of stoichiometric coefficients to the reactants and products is necessary to balance chemical equations. This is significant because a chemical equation must adhere to the laws of conservation of mass and constant proportions, meaning that both the reactant and product sides of the equation must contain the same number of atoms of each element.Balanced equation:
3NaBH4 (s) + 4BF3(g) 2B₂H6(g) + 3NaBF4(s)
ii) 4 moles of BF3 reacts with 3 mole of NaBH4
1 mole of BF3 reacts with 3/4 = 0.75 mole of NaBH4
so the 1.299 moles of BF3 will react with 1.299× 0.75 = 0.974 moles of NaBH4
iii) 3 moles of NaBH4 gives 2 moles of B2H6
1 mole of NaBH4 gives 2/3 = 0.6 moles of B2H6
so, 0.893 mole of NaBH4 will give 0.893 × 0.6 = 0.535 molesof B2H6.
iv) 2 moles of B2H6 is produced with 3 moles of NaBF4
if 1 mole of B2H6 is produced then 3/2 = 1.5 moles of NaBF4 is produced with it.
so is 1.987 mol of B2H6 is obtained then 1.987 × 1.5 = 2.98 moles of NaBH4 will be obtained.
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When water moves from a liquid to a gas, it has evaporated?
A + B <-------> AB is an example of what type of chemical reaction
Answer:
Synthesis reaction
Explanation:
In synthesis reactions, two or more atoms/molecules combine to form a larger molecule.
These reactions follow the general structure: A + B <-----> AB.
Explain how fomation of lines indicate the presence of energy level
The first four ionization energies for element “X” (not in kJ/mol) are 170, 350, 1800, 2500. The first four ionization energies for element “Y” are 200, 400, 3500 and 5000. Identify elements “X” and “Y”. Explain your choice.
The elements involved could be ba--rium and strontium.
What is the ionization energy?We know that the ionization energy refers to the energy that must be supplied in order for an electron to leave the atom. The energy could bee supplied in the form of heat or light.
In the question, we have the first four ionization energies of the elements X and Y. The lower first and second ionization energies suggest that the electrons are removed from the outermost shells and that the two elements are divalent. That explains the quantum jump that occurs after the second ionization energy in each case.
The low first and second ionization energies implies that the elements are highly electropositive and are likely to be ba--rium and strontium.
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Broad areas of study
In FET colleges, there are six broad area of study: arts, business, education, engineering, management, and agricultural.
arts - study of musicCommerce includes marketing and bookkeeping.Education: Education and growthConstruction engineeringPrimary agricultural productionAdministration - HospitalityInstitutions offering Further education and Training (FET) are those that offer instruction and training to students in grades 10 through 12.
It also includes training that is efficient and career-focused that is provided by technical, community, and private universities.
arts - study of musicCommerce includes marketing and bookkeeping.Education: Education and growthConstruction engineeringMedical SciencesPrimary agricultural productionAdministration - HospitalityThe development of the nation's economy depends heavily on the education sector. The country would be more literate and educated if the kids are well-educated.To know more about FET
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describe the features of organic compounds
Answer:
Organic compound features:
Explanation:
Complex structures
High molecular weights
Depend on Carbon, Hydrogen and Water
Combustile in nature
Form covalent bonds
Low melting and boiling points
Calculate the number of nitrogen atoms in a 80.0 g sample of dinitrogen tetroxide (N₂O4).
Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
The number of atoms of nitrogen in an 80.0 g sample of dinitrogen tetroxide (N₂O4) is 1.047 * 10²⁴ atoms.
What is the number of nitrogen atoms in an 80.0 g sample of dinitrogen tetroxide (N₂O4)?The number of nitrogen atoms in an 80.0 g sample of dinitrogen tetroxide (N₂O4) is calculated as follows:
Molar mass of N₂O4 = 92 g/mol
Moles of N₂O4 in 80.0 g sample = 80/92
Moles of N₂O4 in 80.0 g sample =0.87 moles
Moles of nitrogen in the sample = 0.87 * 2
Moles of nitrogen in the sample = 1.74 moles
1 mole of nitrogen contains 6.0 * 10²³ atoms
Number of atoms of nitrogen = 1.74 * 6.0 * 10²³ atoms
Number of atoms of nitrogen = 1.047 * 10²⁴ atoms
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A very thin slice is removed from a peanut and treated with Sudan IV stain. Then a drop of Biuret Reagent is added to the peanut slice. When you examine the peanut slice under a microscope, patches of pink red and violet are visible. What conclusions can you draw from your examination
The conclusions that can be drawn from the examination is that peanuts contain lipids and proteins.
Where are Sudan IV and Biuret reagent used?Sudan IV is a dye used for staining of lipids ,triglycerides.The test making use of Sudan IV involves adding a few drops of Sudan IV to the solution containing lipids.
If no lipids are present in the sample ,the dye sinks at the bottom of the test tube.Positive test for Sudan IV involves the color of the reagent changing to red.
Biuret test is a chemical test used for detection of peptide bonds that is in turn proteins present in a sample.In the presence of proteins, it forms a violet color co-ordination complexes in alkaline range.
The test can be used for testing the concentration of proteins as peptide bonds occur along the same frequency per amino acid.
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How would the following errors affect the empirical formula for the compound? That is, will these errors cause the calculated number of moles of water in the hydrate to be artificially high or low? a. The student ran out of time and did not do the second heating. Explain how this error will affect the calculation for the number of moles of water in the hydrate? Will ht efinal answer be artificially high or low? b. The student recorded the mass of the cup + sample incorrectly and started with 2.20 g of hydrated compound but used 2.00 g in the calculations. Explain how this error will affect the calculation for the number of moles of water in the hydrate? Will the final answer be artificially high or low? How do you know?
The heating is done to eliminate water from the molecule, if second heating is not done it means water is present in a compound so it will show higher molecular mass. The artificial calculated mole of water is lower.
What is mole?Mole is defined as a standard scientific unit for measuring large quantity for very small unit.
Heating is done to eliminate water from the compound, if second heating is not done it means water is present in the compound. While calculating we will get higher molecular mass and moles of water is lower then the actual value.
The artificially calculated moles of water is lower, because the student consider the lower initial mass. The difference between the said value and calculated value is also lower and the student will think that less water was consumed on heating.
Thus, the heating is done to eliminate water from the molecule, if second heating is not done it means water is present in a compound so it will show higher molecular mass. The artificial calculated mole of water is lower.
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A 25.0-g sample of pure iron at 85 °C is dropped into
75 g of water at 20. °C. What is the final temperature
of the water-iron mixture?
A sample of 25.0-g pure iron at the 85 °C is dropped into 75 g of water at 20°C. 22.25 °C is the final temperature of the water-iron mixture.
What is Specific Heat Equation ?The specific heat equation is represented as
Q = mcΔT
where,
Q = heat energy in Joules
m = mass of substance
c = specific heat
ΔT = change in temperature in K
For iron given that
m = 25 g
c = 0.45 J/g°C
T₁ = 85°C
Now by putting the values in the above formula then we get
Q₁ = mcΔT
= 25 × 0.45 × (T₂ - 85)
= 11.25 × (T₂ - 85)
For water given that
m = 75 g
c = 4.184 J/g°C
T₁ = 20°C
Now,
Q₂ = mcΔT
= 75 × 4.184 × (T₂ - 20)
= 313.8 × (T₂ - 20)
Now,
Heat is generated by the iron = Heat is gained by the water.
Q₁ = -Q₂
11.25 × (T₂ - 85) = - 313.8 × (T₂ - 20)
325.05 T₂ = 7232.25
T₂ = 22.25 °C
22.25 °C is the final temperature of the water-iron mixture.
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If 7.50 mol of NH₃ and 8.15 mol of O₂ react in the following reaction, how many moles of H₂O will be formed? 4 NH₃ (g) + 5 O₂ (g) → 4 NO (g) + 6 H₂O (g)
If 7.50 mol of NH₃ and 8.15 mol of O₂ react in the following reaction. The number of moles of H₂O that will be formed is 9.84 moles.
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
Using the molar coefficients in the balanced equation, 6 moles of water are formed for every 4 moles of NH₃.
6 moles of water are formed for every 5 moles of O₂.
So (7.5 moles NH₃)(6 moles H₂O)/4 moles NH₃) = 11.25 moles water
For (8.20 moles O₂) / (6 moles H₂O)(5 moles O₂) = 9.84 moles H₂O.
So O₂ is the limiting reagent, and we can only make as much product as allowed by the limiting reagent.
Thus, the number of moles is 9.84 moles of water.
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