Answer:
The Classification of elementary students and the basis of their state of mind determines how they are and how they react to specific things.
Explanation:
The classification of that specific person depends on their qualifications
5. What is the primary purpose of muscle?
Answer:
Any type of movement
Explanation:
All muscles are used for any way of movement in the body.
Which substance will contain the strongest bond between the two carbon atoms?
A. ethane, H3CCH3
B. ethene, H2CCH2
C. ethyne, HCCH.
D. chloroethene, H2CCHCl
Answer:
b
Explanation:
Ethyne will contain the strongest bond between the two carbon atoms as the triple bonds are the strongest.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Please help!!!
Which layer of the sun is shown extending into space in the picture above?
Group of answer choices
Corona
Radiative zone
Convective zone
Photosphere
Answer:
Corona
Explanation:
Is the answer so yeah...
A student claims that if she wanted to make a solution quickly, she should use small pellets instead of powder along with heating and stirring. Do you agree or disagree with the student's claim? Answer using CER format. PLS HELP I’m a little confused and don’t know what to put.
Answer:
I disagree with the student's claim
Explanation:
From basic chemistry, the rate of chemical reaction increases with an increased surface area.
This simply means that a powdered substance will react faster than a small pellet of the same substance.
Let us break this down further. The pellet has a smaller exposed surface per grain to the solvent, here is how. Imagine the powdered substance bunched up together to make the small pellet, grains at the center of the pellet is blocked by other grains around it, and will take time before it comes in contact with the solvent. For the powdered grains, each grain has a surface independently exposed to the solvent and can easily come in contact with the solvent, taking less time to react with the solvent.
Technically, a powdered substance has more exposed surface area and logically will take a shorter time for the reaction to be complete.
How many atoms of each element are in the chemical formula......
CA(OH)2
A.1 calcium, 1 oxygen, and 1 hydrogen
B.1 calcium, 2 oxygen, and 2 hydrogen
C.2 calcium, 1 oxygen, and 2 hydrogen
D.2 calcium, 2 oxygen, and 2 hydrogen
Answer:
Option B. 1 calcium, 2 oxygen, and 2 hydrogen
Explanation:
The number of each atoms present in Ca(OH)2 can be summarised as follow:
Calcium (Ca) = 1
Oxygen (O) = 2
Hydrogen (H) = 2
From the above illustration, we can see clearly that Ca(OH)2 contains 1 calcium, 2 oxygen and 2 hydrogen.
Answer:
1 calcium, 2 oxygen, and 2 hydrogen
1 calcium, 2 oxygen, and 2 hydrogen
1 calcium, 2 oxygen, and 2 hydrogen
1 calcium, 2 oxygen, and 2 hydrogen
1 calcium, 2 oxygen, and 2 hydrogen
1 calcium, 2 oxygen, and 2 hydrogen
1 calcium, 2 oxygen, and 2 hydrogen
XD
Explanation:
Astronomers studying the planet of Rhombus have detected sedimentary rock on its surface. One astronomer wonders if material in this sedimentary rock used to be in igneous rock deep in Rhombus's interior. Can igneous rock become sedimentary rock? Explain your answer
Yes, igneous rock become sedimentary rock through a process called sedimentation.
The sedimentary rock formed in the process above arises from sediment that was compacted and cemented. When igneous rock is lifted up by plate motion toward Rhombus’s surface, it become exposed to energy from Rhombus’s sun. Therefore, wind and water can move and breakdown the igneous rock into sediment. This process here, the sedimentary rock could have been igneous rock.In sedimentation, An igneous rock is broken down or crushed into little piece of rock called sediment, the sediment is then packed together as a result of othe rocks or strong forces, that form together to make a Sedimentary rock.
Conclusively, The process of erosion, heat and depositing rock grains which can also be known as sedimentation can alter or change igneous rock into sedimentary rock.
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Help ! I am stuck on this question please help
What are the two isomers of ethene
Answer:
These are called cis-but-2-ene (where the groups are on the same side) or trans-but-2-ene (where they are on opposite sides). Cis-but-2-ene is also known as (Z)-but-2-ene; trans-but-2-ene is also known as (E)-but-2-ene. For an explanation of the two ways of naming these two compounds, follow the link in the box below.
Explanation:
6. How much water must be added to 600 mL of a 0.15 mol/L Ca(OH); solution
to make a solution with a concentration of 0.10 mol/L? (4 marks)
Answer:
300mL
Explanation:
To obtain the volume of water added, let us calculate the volume of the diluted solution.
Data obtained from the question include:
Molarity of stock solution (M1) = 0.15mol/L
Volume of stock solution (V1) = 600mL
Molarity of diluted solution (M2) = 0.1mol/L
Volume of diluted solution (V2) =..?
The volume of the diluted solution can be obtained as follow:
M1V1 = M2V2
0.15 x 600 = 0.1 x V2
Divide both side by 0.1
V2 = 0.15 x 600 / 0.1
V2 = 900mL.
Therefore the volume of the diluted solution is 900mL.
Finally, we can obtain the volume of the water added by calculating the difference in the volume of the diluted solution and that of the stock solution. This is illustrated below:
Volume of stock solution (V1) = 600mL
Volume of diluted solution (V2) = 900mL
Volume of water added =...?
Volume of water added = V2 – V1
Volume of water added = 900 – 600
Volume of water added = 300mL
Therefore, the volume of water added is 300mL
Which statements describe functions of DNA? Select three options.
Answer:
The function of DNA is to store all of the genetic information that an organism needs to develop, function, and reproduce. Essentially, it is the biological instruction manual found in each of your cells. The instructions in DNA are written in a simple alphabet that has just four letters—A, T, C, and G.
Explanation:
Answer:
It is ABD
Explanation:
If I add water to 100mL of a 0.15 M NaOH solution until the final volume is 150mL, what will the molarity of the diluted solution be?
Answer: The molarity of the diluted solution be 0.10 M
Explanation:
According to the dilution law,
[tex]C_1V_1=C_2V_2[/tex]
where,
[tex]C_1[/tex] = concentration of concentrated solution = 0.15 M
[tex]V_1[/tex] = volume of concentrated solution = 100 ml
[tex]C_2[/tex] = concentration of diluted solution= ?
[tex]V_2[/tex] = volume of diluted solution= 150 ml
Putting the values we get:
[tex]0.15\times 100=M_2\times 150[/tex]
[tex]M_2=0.10M[/tex]
Thus the molarity of the diluted solution be 0.10 M
Consider the reaction 2Na+ Cl2 - 2NaCl.
and is
Na is
Oxidized or reduced
Answer:
the other one is correct...
a. oxidized
b. reducing agent
Explanation:
edge 2021 just did it
The sodium in the given reaction is oxidized from Na to Na⁺.
What is oxidation?Oxidation can be described as a process that involves the addition of oxygen or an electronegative element or the removal of hydrogen atoms or any electropositive element. Oxidation can be defined as the reaction in which an atom or ion loses its electrons.
The reduction can be defined as a reaction that involves the addition of hydrogen or the removal of oxygen or any electronegative element. The reduction can also be defined as the reaction in which an atom or ion gains electrons.
In the given chemical reaction of the formation of NaCl:
[tex]2Na + Cl_2\longrightarrow 2NaCl[/tex]
In this chemical reaction the sodium is oxidized as shown below:
[tex]Na\longrightarrow Na^+ +e^-[/tex]
In this chemical reaction the Chlorine is reduced as shown below: [tex]Cl_2 +2e^-\longrightarrow 2Cl^-[/tex]
Therefore, sodium is oxidized in the given reaction.
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An unsaturated solution has,
A. the maximum concentration of solute that can be dissolved into solvent at a specific temperature.
B. a higher concentration of solute that can be dissolved into solvent at a specific temperature.
C. unstable characteristics.
D. a lower concentration of solute than can be dissolved into solvent at a specific temperature.
Answer:
D... I think? Because it is unsaturated so there is more solute than solvent...
Which element will reduce Mg2+ to Mg?
a) Fe b) Ba c) Pb d) Ag
Answer:
Ba
Explanation:
Let us consider the electrode potential of one of the options listed in the question,
Ba2+(aq) + 2 e- -----> Ba(s). -2.90V
It is very important to recall that a metal can only displace another metal from aqueous solution if that metal has a more negative reduction potential that the metal it displaced. This implies that if there are two metals A and B, A can only displace B from an aqueous solution of B if A has a more negative reduction potential than B.
The reduction potential of Mg^2+ is -2.37V. This is less negative than that of Ba^2+ which is -2.90V. Hence barium can reduce Mg^2+ to metallic Mg.
what is an atom
plz help
Answer:
the smallest thing in the world
Explanation:
Answer:
It is the smallest particle of the elements that exists ob the earth
if 15 mol C is mixed with 10 mol O2 which reactant is the limiting reactant? Which reactant would be the excess reactant?
Answer:
C is the excess reactant.
Explanation:
Reaction is C + O2 --> CO2
1mol of C required to react with 1mol O2
Therefore 15 - 10 = 5moles of C will be in excess
If 500.0 mL of 0.450 M sodium phosphate is reacted with an excess of iron (II) nitrate solution, how many grams of iron (II) phosphate are produced?
Answer:
If 500.0 mL of 0.450 M sodium phosphate is reacted with an excess of iron (II) nitrate solution, how many grams of iron (II) phosphate are produced?
idk
Explanation:
Answer:
164.2726 g
The ratio in the equation is 3:1 so the limit reaction ratio is 3:1 therefore, 0.392456 mol of were reaction.
Brainlist pls!
Gravity does NOT * 10 points increase when the distance between two objects increases. increase when the distance between two objects decreases. increase when the mass of one object increases. increase when the mass of both objects increases.
Answer:
increase when the distance between two objects increases
Explanation:
when the objects move further apart, the gravitational pull between them becomes weaker, and so the gravity isn't as strong. all of the other options increase gravity
Which is an example of a beneficial mutation? ANSWER AND ILL GIVE BRAINLY POINTS !!!!!! HELP ASAP !
Answer:
Some humans are randomly immune to malaria or have increased bone density due to random beneficial mutations.
Explanation:
Answer: one that changes the color of a rabbit, allowing it to hide from predators.
Explanation:Hey give me brainliest award need it
Calculate the temperature of a 0.50 mol sample of a gas at 0.987 atm and a volume of 12 L.
-7 C
11 C
15.5 C
288 C
Answer: [tex]15.5^0C[/tex]
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 0.987 atm
V = Volume of gas = 12 L
n = number of moles = 0.50
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature = ?
[tex]T=\frac{PV}{nR}[/tex]
[tex]T=\frac{0.987atm\times 12L}{0.0820 L atm/K mol\times 0.50mol}=288.5K=(288.5-273)^0C=15.5^0C[/tex]
Thus the temperature of a 0.50 mol sample of a gas at 0.987 atm and a volume of 12 L is [tex]15.5^0C[/tex]
When K-37 undergoes positron emission, what is the resulting atom?
A) K-37
B) K-38
C) Ar-37
D) Ar-38
Answer:
C) Ar-37
Explanation:
A positron is a positively charged electron. It has the same mass as that of an electron, but opposite charge. It is the counterpart of an electron.
The reaction involving the emission of a positron by k-37 would produce a Ar-37, which is an unstable isotope of Argon. In this emission, there must not be a particle loss or creation, the addition of the mass number and proton number on LHS must be the sane as that on RHS of the equation.
An isotope is ability of an element to exist in two or more forms with the same atomic number but different mass number.
What is the name of MnO? Explain how you determined the bond type and the steps you used to determine the naming convention for the compound.
Answer:
Magnesiumoxide
Explanation:
I don't know
Which of these is an Arrhenius base?
A. LiOH
B. NH3
C. H2PO4-
D. CH3COOH
Answer:
LiOH
Explanation:
Among the following LiOH or lithium hydroxide is a Arrhenius base as it increase hydroxide ion concentration of a substrate.
What is a base?
According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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state two importance of soil air to plants
Answer:
Soil contains minerals such as Iron, Zinc, Nitrogen compounds, etc. that are all essential to sustaining life. It also holds water and makes it available for plants to use. Soil also contains ores from which we can extract metals such as iron, copper, gold, and aluminum.
(Hope this helps) Sky
3.5 moles of argon gas are maintained at a temperature of 293K and a pressure of 2.5 atm. What is the volume
occupied by the argon gas sample? Value of R = 0.0821 L. atm/mol-K
A 33.7L
B 22.4L
C 31.2L
D 17.2L
Answer:
A 33.7L
Explanation:
Hello,
In this case, we can deal with argon as an ideal gas that can be studied via the ideal gas equation:
[tex]PV=nRT[/tex]
Whereas we have the pressure, volume, moles, ideal gas constant and temperature respectively, so, for us to find the volume we simply solve for it as shown below:
[tex]V=\frac{nRT}{P} =\frac{3.5mol*0.082\frac{atm*L}{mol*K} *293K}{2.5atm} \\\\V=33.7L[/tex]
Therefore, the answer is A 33.7L.
Best regards.
Given the formula V=1/3Ah, solve for h.
Answer: h = 1/3VA
Explanation:
V = 1/3Ah
3AhV = 1
h = 1/3VA
how many molecules are there in 125 grams of sugar, C12H22O11
Answer:
A molecule of sucrose (C12H22O11) has 12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms. The subscripts also indicate the ratios of the elements.
Explanation:
This is because it has the abbreviation of the Carbon atoms, Hydrogen atoms, and Oxygen atoms are right before the number.
The number of molecules of sugar is required.
The number of molecules is [tex]2.2\times 10^{23}\ \text{molecules}[/tex]
m = Mass of sugar = 125 g
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
Molar mass of sugar
[tex]M=C_{12}H_{22}O_{11}=12\times 12+1\times 22+16\times 11\\\Rightarrow M=342\ \text{g/mol}[/tex]
Number of moles is
[tex]n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{125}{342}\\\Rightarrow n=0.365\ \text{mole}[/tex]
Number of molecules is
[tex]N=N_An\\\Rightarrow N=6.022\times 10^{23}\times 0.365\\\Rightarrow N=2.2\times 10^{23}\ \text{molecules}[/tex]
The number of molecules is [tex]2.2\times 10^{23}\ \text{molecules}[/tex]
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85.0g of barium metal are added to 275ml of 3.55M solution of hydrochloric acid, how many milliliters of hydrogen gas are collected at 18.5oC and 755.5mmHg in this single replacement reaction?
Answer: 0.024 ml of hydrogen gas are collected at [tex]18.5^0C[/tex] and 755.5mmHg in this single replacement reaction
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Ba=\frac{85.0g}{137g/mol}=0.620moles[/tex]
To calculate the number of moles for given molarity, we use the equation:
[tex]\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution in ml}}[/tex]
[tex]3.55M=\frac{\text{Moles of} HCl\times 1000}{275ml}\\\\\text{Moles of }HCl=\frac{3.55\times 275}{1000}=0.976mol[/tex]
The balanced chemical reaction is:
[tex]Ba+2HCl\rightarrow BaCl_2+H_2[/tex]
According to stoichiometry :
2 moles of [tex]HCl[/tex] require = 1 mole of [tex]Ba[/tex]
Thus 0.976 moles of [tex]HCl[/tex] will require=[tex]\frac{1}{2}\times 0.976=0.488moles[/tex] of [tex]Ba[/tex]
Thus [tex]HCl[/tex] is the limiting reagent as it limits the formation of product and [tex]Ba[/tex] is the excess reagent.
As 2 moles of [tex]HCl[/tex] give = 2 moles of [tex]H_2[/tex]
Thus 0.976 moles of [tex]HCl[/tex] give =[tex]\frac{2}{2}\times 0.976=0.976moles[/tex] of [tex]H_2[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 755.5 mmHg = 0.994 atm (760 mm Hg = 1 atm )
V = Volume of gas in L = ?
n = number of moles = 0.976
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]18.5^0C=(18.5+273)K=291.5K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{0.994atm\times 0.0820 L atm/K mol\times 291.5K}{0.994atm}=24.0L=0.024ml[/tex] (1L=1000ml)
Thus 0.024 ml of hydrogen gas are collected at [tex]18.5^0C[/tex] and 755.5mmHg in this single replacement reaction
What is the pressure exerted by 2.3 mol of a gas with a temperature of 40. °C and a volume of 3.5 L?
Answer:
16.89 atm.
Explanation:
Step 1:
Data obtained from the question
Number of mole (n) = 2.3 mol
Temperature (T) = 40°C = 40°C + 273 = 313K
Volume (V) = 3.5L
Pressure (P) =..?
Gas constant (R) =0.0821 atm.L/Kmol
The pressure exerted by the gas can be obtained by using the ideal gas equation as shown below:
PV = nRT
Divide both side by V
P = nRT /V
P = 2.3 x 0.0821 x 313 / 3.5
P = 16.89 atm.
Therefore, the pressure exerted by the gas is 16.89 atm.
Un tanque de acetileno para una antorcha de soldadura de oxiacetileno proporciona 9340 L de gas acetileno, C2H2, a 0°C y 1 atm 2CH2H2(g) + 502(g) -> 4CO2(g) + 2H2O(g) ¿Cuántos tanques de oxígeno, cada uno con 7x10³ L de o2 a 0°C y 1 atm, serán necesarios para quemar el acetileno?
Answer:
3.33 tanques de O₂
Explanation:
Basados en la reacción:
2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O(g)
2 moles de acetileno reaccionan con 5 moles de oxígeno produciendo 4 moles de dióxido de carbono y 2 moles de agua
La ley de Avogadro dice que el volumen de un gas bajo temperatura y presión constantes es proporcional a las moles de este gas. Así, como 2 moles de acetileno reaccionan con 5 moles de oxígeno, los litros de O₂ necesarios para quemar 9340L de acetileno son:
9340 L C₂H₂ × (5 moles O₂ / 2 moles C₂H₂) = 23350L de O₂
Si un tanque contiene 7x10³ L de O₂ serán necesarios:
23350L O₂ ₓ (1 tanque / 7x10³L) = 3.33 tanques de O₂