Answer:
42 19 K→42 20 Ca+e−
Explanation:
Naturally-occurring potassium atoms have a weighted average atomic mass of 39.10 (as seen on most modern versions of the periodic table.) Each potassium atom contains 19 protons p+ and thus an average potassium atom contains about 39.10−19≈20 neutrons n0.
This particular isotope of potassium-42 contains 42 nucleons (i.e., protons and neutrons, combined;) Like other isotopes of potassium 19 out of these nucleons are protons; the rest 42−19=23 are therefore neutrons.
Please help!!!!!!!!!!!
Answer:
b
Explanation:
and if that wrong let me know cause jm my science class its b
calculate the number of atoms in 2.5 mol manganese.
Answer:
1.5 × 10²⁴ atoms Mn
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
2.5 mol Mn
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]2.5 \ mol \ Mn(\frac{6.022 \cdot 10^{23} \ atoms \ Mn}{1 \ mol \ Mn} )[/tex] = 1.5055 × 10²⁴ atoms Mn
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
1.5055 × 10²⁴ atoms Mn ≈ 1.5 × 10²⁴ atoms Mn
What type of soil is best for growing plants?
how many molecules are in 2.5 mol of NaCl?
(a) 1.51×10^24
(b) 146
(c) 1.51×10^23
(d) 4.15
Answer:
1.51 x 10²⁴molecules
Explanation:
Given parameters:
Number of moles of NaCl = 2.5moles
Unknown:
Number of molecules = ?
Solution:
The number of molecules that can be found in a given mole is given as the Avogadro's constant;
1 mole of substance = 6.02 x 10²³ molecules
2.5 mole of NaCl = 2.5 x 6.02 x 10²³ molecules
= 1.51 x 10²⁴molecules
What Group is this element in?
Please answer （＾∇＾）
What will increase the turgor pressure in a plant
Answer:
Cell expansion and an increase in turgor pressure is due to inward diffusion of water into the cell, and turgor pressure increases due to the increasing volume of vacuolar sap. A growing root cell's turgor pressure can be up to 0.6 MPa, which is over three times that of a car tire.
Explanation...read that and you will have a sucess
Part A
If the theoretical yield of the reaction below corresponds to 99.2 g and the actual yield was 60.9 g, calculate the percent yield.
Given: Li2O + H202LiOH
20
Answer:
61.39%
Explanation:
The percent yield of a substance can be calculated using the formula:
Percent yield = actual yield/theoretical yield × 100%
Based on the information provided on the reaction in this question, the theoretical yield is given as 99.2g while the actual yield is given as 60.9g.
Hence, the percent yield is calculated thus:
% yield = 60.9/99.2 × 100
% yield = 0.6139 × 100
% yield = 61.39%
The percent yield is 61.39%
Write the name of Co4(SiO4)3
Answer:
Copper siliconquadoxide
Explanation:
Please help ..
What is the molarity of a 0.30-liter solution containing 0.50 moles of H2SO4?
A 1.7M
B 0.6M
C 0.8M
D 0.15M
Answer:
1.7M
Explanation:
Given parameters:
Volume of solution = 0.3L
Number of moles = 0.5moles
Unknown:
Molarity = ?
Solution:
The molarity of a substance is the number of moles of solute that can be found in the volume of a solution.
Molarity = [tex]\frac{number of moles }{volume}[/tex]
Insert the parameters and solve;
Molarity = [tex]\frac{0.5}{0.3}[/tex] = 1.7M
5.(03.01 LC)
Which two particles are present in the nucleus of an atom? (5 points)
Electrons and neutrons
Electrons and molecules
Protons and neutrons
Protons and electrons
6. (03.01 LC)
Thank you!
Answer:
Protons and neutrons
Explanation:
In the nucleus of an atom only the protons and neutrons are present. The extra-nuclear space is filled with electrons which are negatively charged.
Protons are the positively charged particles within an atomNeutrons do not carry any charges. Electrons are negatively chargedOnly two of the subatomic particles are found in the nucleus of an atom. The particles are protons and neutrons.
Answer:
Protons and Neutrons
Explanation:
How can biologic weathering result in chemical erosion?
plants transpire water vapor
bacteria release acids and other agents that break down rock
large herds trample rocks and break up soil
roots loosen soil and break rocks
Answer:
bacteria release acids and other agents that break down rock
Explanation:
One of the ways in which biological weathering results in chemical erosions is through bacteria releasing acids and other agents to break down a rock.
Weathering is defined as the physical disintegration and chemical decomposition of rocks to form sediments and soils.
The process of erosion removes the weathered materials from the earth surface.
Chemical weathering involves the decay of rocks by chemical means.
The bacteria is a biological organismAs it releases its acids and the rocks begin to break down, biological weathering takes placesif vegetable oils made of vegetables, and olive oils made of olives......whats baby oil made of?
ANSWER:
oil lol
EXPLANATION:
Answer:
Mineral oil, fragrance, aloe barbadensis leaf extract, tocopheryl acetate (vitamin E), water.
Explanation:
use the term reclamation in a sentence
Answer:
Explanation:
The increase of the arable land has been affected partly by the reclamation of the marshes, but mostly by the transformation of large tracts of the puszta
An example of a reclamation is how landfill employees sift through garbage to find usable items. An example of a reclamation is trees growing on land that was heavily logged.
gher ord inking skills type questions: If a compound gives hydrogen ion and chloride ion in the solution state,
Write name and molecular formula of the compound.
At normal temperature and pressure, hydrogen chloride (HCl), a gas composed of the element's hydrogen and chlorine, is a gas.
An aqueous solution of hydrogen chloride is what is known as hydrochloric acid, commonly referred to as muriatic acid. It has an unmistakably strong odor and is colorless. It is categorized as a powerful acid. In the digestive tracts of the majority of animal species, including humans, it is a part of the stomach acid. In the food, textile, metal, and rubber sectors, hydrogen chloride (HCl) is frequently employed as a bleaching agent to neutralize alkaline substances. When discharged into the soil, it is neutralized, and when it comes into contact with water, it hydrolyzes quickly.
Learn more about HCl here-
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A student used a pipette to add 25.0 cm of KOH of unknown concentration to
a conical flask.
The student carried out a titration experiment to find the volume of 0.150 mol/dmº
H2SO4 needed to neutralise the KOH.
The student found that, on average, 17.20 cm of the H2SO4 solution was
required for neutralisation.
Calculate the concentration of the KOH solution.
The concentration of the KOH solution = 0.2064 M
Further explanationTitration is a procedure for determining the concentration of a solution (analyte) by reacting with another solution whose known concentration (usually a standard solution) is called the titrant. Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range
Acid-base titration formula
Ma Va. na = Mb. Vb. nb
Ma, Mb = acid base concentration
Va, Vb = acid base volume
na, nb = acid base valence (number of ions H+/OH-)
a=H₂SO4(valence = 2, H₂SO4⇒2H⁺+SO₄²⁻, 2 ions H⁺)
b=KOH(valence = 1, KOH⇒K⁺+OH⁻, 1 ion OH⁻)
Ma = 0.15 M
Va = 17.2 cm³
Vb=25 cm³
The concentration of the KOH(Mb) :
[tex]\tt 0.15\times 17.2\times 2=Mb\times 25\times 1\\\\Mb=0.2064[/tex]
Josh prepares a solution by mixing sodium nitrate and water. To calculate the molarity of the solution, Josh should calculate the moles of which substance, and why?
sodium nitrate, because it is the solvent
sodium nitrate, because it is the solute
water, because it is the solvent
water, because it is the solute
Answer:
sodium nitrate, because it is the solute
Explanation:
To find the molarity of the solution, Josh should determine the number of moles of the sodium nitrate.
Molarity is defined as the number of moles of solutes in a given volume of solution.
Molarity = [tex]\frac{n}{v}[/tex]
n is the number of moles of solute
v is the volume of solution
Answer:
C: sodium nitrate, because it is the solute
Explanation:
Calculate the mass of olive oil in a 750mL bottle if the density of olive oil is 0.92 g/mL. *Use the GRASP method.
The mass of olive oil : 690 g
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
Given
volume of olive oil = V=750 ml
density of olive oil = ρ = 0.92 g/ml
Required
the mass of olive oil
Analysis
the formula :
[tex]\tt m=\rho\times V[/tex]
Solution
[tex]\tt m=0.92\times 750\\\\m=690~g[/tex]
Paraphrase
the mass of olive oil : 690 g
why does a 30-kg barbell have more inertia than a 10-kg barbell
write the formula of the first 5 members in the series of alkynes
Do Elements retain their properties when they form a compound?
Answer: No
Explanation:
The components of a compound do not retain their individual properties.
Fill in the coefficients, help, please.
The relative atomic mass of an element is the mass of its atoms with that which element?Give the name?
The relative atomic mass of an element is the mass of its atoms with Carbon element.
What is Atomic mass?The atomic mass of an element is defined as the average mass of the element.
Atomic mass is also defined as the mass of nucleus or it is the sum of atomic number and number of neutrons present in the atom of an element.
What is relative mass number?Relative atomic mass is defined as the atomic mass compared to One-twelvth the mass of the one atom of carbon. Since, it is seen that it is comparison of atomic mass with 1/12 the mass of an atom of carbon therefore it is indicated as relative atomic mass.
Thus, we concluded that the relative atomic mass of an element is the 1/12 the mass of its atoms with Carbon element.
learn more about Relative atomic mass:
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The name for the ionic compound CoHPO4
Answer:
Dicalcium phosphate. (I'm sure meant for the "o" to be an "a" for Calcium).
Explanation:
I hope this helps! :D Have a nice night!
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i need help with the je that asks which parent actually determines the sex the child
Answer:
Actually it is father who actually determine the sex of child
Explanation:
Because father has X & Y chromosome but mother has only XX chromosome. So it depends on which chromosome of father. If father's gamete has only x chromosome then the child will be female. And if the father's gamete has Y chromosome then the child will be male.
please mark me brainliest and 5 star
a sample of gas collected in the upper atmosphere of 0.75 atm is compressed into a 150.0 mL container at the same temperature. To what volume would the original sample have had to be compressed to exert a pressure of 10.0atm
I am trying to find out what v1 is
p1= 0.75
p2=10.0 atm
v2=150.0mL
v1=?
Answer:
Say Sofa and king ten times in a row fast
Explanation:
When 8.0 moles of chromium react, how many moles of chromium (lll) oxide are produced?
Moles of chromium (lll) oxide produced : 4 moles
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
4Cr+3O₂⇒2Cr₂O₃
moles of Cr=8 moles
From the equation, mol ratio Cr : Cr₂O₃ = 4 : 2, so mol Cr₂O₃ :
[tex]\tt \dfrac{2}{4}\times 8=4~moles[/tex]
70% of rubbing alcohol is made up of water & alcohol that is used as antiseptic and disinfectant. Which of the following is the solute?
a. 30 parts alcohol
b. 70 parts water
c. 30 parts water
d. 70 parts alcohol
Answer:
choose a. 30 parts alcohol
How do the number of protons, rumber of neutrons, and the mass number relate to each other
Answer:
Protons are the atomic number and for each element they never change.
Electrons are equal to the atomic number unless it is an Ion (Positive charge means it has less negative means it has more)
Mass number is Protons+Nuetrons
Explanation:
the pH of a solution of a is increased from 2 to 3 then the concentration of h + ions will become
Answer:
The H+ concentration would decrease by 10 fold. From .01 to .001
Explanation:
This is due to how a pH of 2 is expressed in scientific notation as 10^-2 power when referring to H+ concentration so a pH of 3 would be 10^-3. Hence it would be 10 times smaller in concentration as the power increases to the negative power the smaller the concentration becomes.