Answer:
Pure substances are further divided into elements and compounds. The combination of two or more pure substances is called a mixture. Mixtures can be classified into two types viz. heterogeneous and homogeneous mixtures.
Explanation:
what blood vessels and chambers of the heart does a red blood cell pass as it delivers oxygen from the lungs to the brain and return to be oxygenated again.
Answer:
capillaries
Explanation:
hope it helps if I'm not tell me right away.
Answer:
Carotid artery, Jugular veins
The chambers are explained below.
Explanation:
THE BLOOD VESSELS
The carotid artery carries red blood (oxygenated) to the head and the neck region and that obviously include the brain via the aorta. To be precise the internal carotid artery supplies oxygenated red blood cells to brain. The jugular veins carry deoxygenated red blood cells from the head back to the heart via the superior vena cava. The most important function of the jugular vein is to drain deoxygenated blood from brain.
THE CHAMBERS
The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle which also pumps the same oxygenated blood to the rest of the body through the aortic valve (aorta).
The right atrium receives deoxygenated blood from the body via the vena cava and pumps the deoxygenated blood to the right ventricle which pumps the deoxygenated blood to be oxygenated by the lungs via the pulmonary valve (pulmonary artery).
CONCLUSION
The oxygenated red blood cells from the lung pass through the pulmonary vein through the left atrium to the left ventricle through the carotid artery (internal carotid artery) via the aorta to the brain and
The deoxygenated red blood cells in the brain are drained through the jugular vein via the superior vena cava to the right atrium, which pumps the deoxygenated blood to the right ventricle. From here the deoxygenated blood is pumped to the lungs via the pulmonary artery for oxygenation.
This is my answer, thus if I got your question right.
what is the acceleration of a 100kg object being pushed with a force of 1000 newton's
Answer:
the person that answered it with the link, dont click it's a virus
Explanation:
What is the meaning of a null hypothesis being rejected?
The hypothesis is definitely correct.
The hypothesis might be correct.
The hypothesis is false.
The null hypothesis is correct.
Answer:
the hypothesis is false
Explanation:
it I rejected because the hypothesis has been tested severally and the answer still proves to be wrong
Answer:
probably the third option: The hypothesis is false
Explanation:
help help help help
Answer:
2,4,6–trimethylheptanal
Explanation:
To name the compound given, we must first obtain the following:
1. Determine the functional group of the compound.
2. Determine the longest continuous carbon chain. This gives the parent name of the compound.
3. Identify the substituent group attached to the compound.
4. Locate the position of the substituent group.
5. Combine the above to obtain the name of the compound.
Now, we shall name the compound as follow:
1. The functional group of the compound is –CHO. Thus, the compound is an alkanal.
2. The longest continuous carbon chain is 7. Thus, the parent of the compound is heptanal.
3. The substituent group attached to the compound is methyl (–CH₃).
NOTE: There are 3 methyl groups attached to the compound.
4. The methyl groups attached to compound are located at carbon 2, 4 and 6.
5. Therefore, the name of the compound is:
2,4,6–trimethylheptanal
Calculate the molar mass of ZnCr04
Answer:
181.403 g/mol is the answer as it is Zinc chromate
Explanation:
Answer:
181.403 g/mol
Explanation:
Molar mass of ZnCrO4 = 181.3737 g/mol. This compound is also known as Zinc Chromate. Convert grams ZnCrO4 to moles or moles ZnCrO4 to grams. 65.38 + 51.9961 + 15.9994*4
1. How many grams of potassium chloride (KCI)
can be dissolved at 10°C?
Answer:
At 10 ∘C , the solubility of potassium chloride is measured to be 31.2⋅g per 100⋅g of water.
Explanation:
When 565g of a metal with temperature of 90.00 C added to 200.0 g of water at 25.00 degrees. Assuming all the heat lost by the iron is transferred to the water ( specific heat capacity of water = 4/18 J/(g-C)), and the final temperature of the mixture is 34.40 degree Celsius what is the heat capacity of the metal?
Answer:
The specific heat is 0.25J/g°C
Explanation:
To solve this question we must know that the heat released for the metal is equal to the heat absorbed for the water. The equation is:
S(Metal)*m(Metal)*ΔT(metal) = S(water)*m(water)*ΔT(water)
Where S of metal is our incognite (Specific heat of metal)
m is the mass of the metal = 565g
ΔT is change in heat of the metal = 90.00°C - 34.40°C = 55.60°C
Specific heat of water = 4.18J/g°C
The mass of water = 200.0g
ΔT of water is 34.40°C - 25.00°C = 9.40°C
Replacing:
S(Metal)*565g*55.60°C = 4.18J/g°C*200.0g*9.40°C
S(metal) = 0.25J/g°C
The specific heat is 0.25J/g°C
Mr. Ragusa asks Hassan to make silver crystals from the following reaction.
2AgNO3 + Cu --> Cu(NO3)2 + 2Ag
Mr. Ragusa gives Hassan 51 g of silver nitrate to conduct the experiment. Hassan gives Mr. Ragusa 20 g of
silver crystals. What was Hassan's percent yield for his experiment?
Please round your answer to 2 decimal places
Answer:
Percentage yield = 61.7%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated:
2AgNO₃ + Cu —> Cu(NO₃)₂ + 2Ag
Next, we shall determine the mass of AgNO₃ that reacted and the mass of Ag produced from the balanced equation. This is illustrated below:
Molar mass of AgNO₃ = 108 + 14 + (16×3)
= 108 + 14 + 48
= 170 g/mol
Mass of AgNO₃ from the balanced equation = 2 × 170 = 340 g
Molar mass of Ag = 108 g/mol
Mass of Ag from the balanced equation = 2 × 108 = 216 g
SUMMARY:
From the balanced equation above,
340 g of AgNO₃ reacted to produce 216 g of Ag.
Next, we shall determine the theoretical yield of Ag. This can be obtained as follow:
From the balanced equation above,
340 g of AgNO₃ reacted to produce 216 g of Ag.
Therefore, 51 g of AgNO₃ will react to produce = (51 × 216)/340 = 32.4 g of Ag.
Thus, the theoretical yield of Ag is 32.4 g.
Finally, we shall determine the percentage yield of Ag. This can be obtained as follow:
Actual yield = 20 g
Theoretical yield = 32.4 g
Percentage yield =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 20 / 32.4 × 100
Percentage yield = 61.7%
i If a chemical system is at equilibrium, any change in the system will always result in an increase of which of the following?
1.The reaction that opposes the change
2. The concentration of the product
3. The concentration of the reactants
4. The temperature of the system
Answer:
1.The reaction that opposes the change
Explanation:
Consider the reaction;
A + B ⇄ C + D
If a constraint such as a change in temperature, pressure or volume is imposed on this chemical system in dynamic equilibrium, the equilibrium position will shift so as to annul the constraint.
This shift in the equilibrium position will favour either the forward or reverse reaction depending on the type of constraint imposed on the system.
Hence, If a chemical system is at equilibrium, any change in the system will always result in an increase of the reaction that opposes the change.
When you draw a bow'across a violin string, which kind of wave is created in
the air surrounding the string?
A. surface
B. electromagnetic
C. longitudinal
D. Transverse
Answer:
C
Explanation:
Answer: C. Longitudinal
Explanation: A P 3 X
What is the value of for this aqueous reaction at 298 K?
A+B↽⇀C+D ΔG°=12.86 kJ/mol
K=
Answer:
The equilbrium constant is 179.6
Explanation:
To solve this question we can use the equation:
ΔG = -RTlnK
Where ΔG is Gibbs free energy = 12.86kJ/mol
R is gas constant = 8.314x10⁻³kJ/molK
T is absolute temperature = 298K
And K is equilibrium constant.
Replacing:
12.86kJ/mol = -8.314x10⁻³kJ/molK*298K lnK
5.19 = lnK
e^5.19 = K
179.6 = K
The equilbrium constant is 179.6How many molecules are in 3 moles of CO2?
O A. 5.418 x 1024
OB. 1.806 x 1024
O C. 6.02 x 1024
O D. 1.806 x 1023
Answer:
1.806 × 10²⁴Explanation:
The number of molecules can be found by using the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 3 × 6.02 × 10²³
We have the final answer as
1.806 × 10²⁴Hope this helps you
Answer: OB. 1.806 x 1024
Explanation:
If I have 100 mL of oil in a container and 100 mL of water in another
conta in er Which container wouldhave more mass?
Answer:
The answer is 200mL each amount have the same mass
Explanation:
100mL +100ML= 200mL mass in each container
Answer:
200ml
Explanation:
In this reaction diagram, which part represents the difference in energy
between the reactants and the products?
Potential energy
HA
Reaction progress
Answer:
Option D. G
Explanation:
In the energy profile diagram, the difference in the energy between reactant and product is called enthalphy Change (ΔH).
Mathematically, the enthalpy change (ΔH) is represented as:
Enthalpy change (ΔH) = Heat of product (Hₚ) – Heat of reactant (Hᵣ)
ΔH = Hₚ – Hᵣ
Considering the diagram given in question above, the difference in the energy of product and reactant is indicated by the letter G
Thus, option D gives the correct answer to the question.
What's the partial pressure of hydrogen in a gas mixture if its mole fraction is 0.1 and the total pressure is 325 torr?
Question 15 options:
325 torr
32.5 torr
100 torr
65 torr
Ionisation enthalpy across the group (increase or decrease)
Give reasons??
Answer:
As we move from left to right across a period, the ionization energy of elements increases. This is due to the decrease in the size of atoms across a period.
Answer:
[tex]\huge\boxed{Answer\hookleftarrow}[/tex]
Ionization enthalpy (IE) is the energy required to remove the highest-energy electron from a neutral atom. In general, ionization energy increases across a period and decreases down a group.So, for your question ⇻ IE decreases down the group.____________________
ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
# ꧁❣ RainbowSalt2²2² ࿐
Which of the following polyatomic ions will form an ionic compound with a single sodium ion?
CO3 2-
HCO3 1-
SO4 2-
SO3 2-
Answer:
Option B, HCO3 1-
Explanation:
The valence of Sodium ion is +1 and the valence of HCO3 is -1. Thus, sodium ion has an extra electron to be donated to complete its outer shell while HCO3 needs an electron to complete its outer shell
Hence Na will combine with HCO3 to form NaHCO3
Option B is correct
The polyatomic ion which will form an ionic compound with a single sodium ion is; HCO3 ¹-
In chemical bonding between ions;
The major criteria is a balance of charges within the compound formed.
As such, all polyatomic ions in the option are di-ionic except for HCO3 1- which can perfectly form an ionic compound with 1 single sodium ion.
Read more on ionic compounds:
https://brainly.com/question/13539062
An aqueous solution was made by dissolving 0.543 g of an unknown, monoprotic acid into 25.00 mL of water in an Erlenmeyer flask. After an acid/base indicator was added, 41.21 mL of 0.150 M NaOH was used to reach the end point.
a)Find the molar mass of the acid.
b)Determine the identity of the acid based on the following data:
PLEASE HELP ME
Answer:
a. 87.8g/mol is the molar mass of the acid.
b. The answer is in the explanation.
Explanation:
To solve this question we must find the moles of the monoprotic acid using the reaction with NaOH (1mole of monoprotic acid reacts with 1 mole of NaOH). With the moles and the mass of the unknown we can find the molar mass.
Moles of NaOH added:
0.04121L * (0.150moles / L) = 6.1815x10⁻³ moles NaOH = Moles monoprotic acid
Molar mass is:
0.543g / 6.1815x10⁻³ moles = 87.8g/mol is the molar mass of the acid
b. I can't see the image you are giving because has a low resolution. But the identity of the acid can be obtained because the acid:
Has the same molar mass.
Is a monoprotic acid.
(a) The molecular mass of the unknown monoprotic acid will be 87.84 g/moles.
(b) The acid can be butyric acid, as it is a monoprotic and have mass near about 87.84 g/mol.
(a) The endpoint by the addition of NaOH has been reached when the monoprotic acid has been completely utilized. Since the NaOH has been monobasic. The moles of NaOH will be equal to the moles of acid.
Moles of NaOH = moles of acid
The molarity of NaOH = 0.15 M
Volume of NaOH = 41.21 ml
Molarity = [tex]\rm \dfrac{moles}{volume\;(L)}[/tex]
Moles = molarity [tex]\times[/tex] volume (L)
Moles of NaOH = 0.15 [tex]\times[/tex] 0.04121 L
Moles of NaOH = 0.00618 moles
Moles of NaOH = moles of acid
moles of acid = 0.00618 moles.
Mass of acid dissolved = 0.543 grams
Molecular weight of acid = [tex]\rm \dfrac{weight}{moles}[/tex]
Molecular weight of acid = [tex]\rm \dfrac{0.543}{0.006815}[/tex]
Molecular weight of acid = 87.84 g/moles.
(b) The acid with the molecular mass of 87.84 g/mol with being the monoprotic acid can be butyric acid. The butyric acid has a molecular weight of 88 g/mol.
For more information about monoprotic acid, refer to the link:
https://brainly.com/question/22497931
Consider an atom that has an electron in an excited state. The electron falls to a lower energy level. What effect does that have on the electron?
Answer:
On returning to lowest energy state which is stable, it releases energy in the form of light. Hence, option A that is the electron releases energy in the form of light on falling to lower energy state from excite state.
Which of the following statements is true?
Answer:
option first is right answer
What is biocapacity?
PLZZ HELP TY
Answer:
Explanation:
The biocapacity or biological capacity of an ecosystem is an estimate of its production of certain biological materials such as natural resources, and its absorption and filtering of other materials such as carbon dioxide from the atmosphere.
93 Points!!! Which of the following join together to form molecules?
Atoms
Organisms
Organs
Tissues
Answer:
Atoms
Explanation:
Atoms are the smallest thing meaning they form molecules which are made of atoms.
Also, your question is not 93 points but whatever lol.
Answer:
Atoms
Explanation:
I took the test
What is 1 x 102 divided by 1 x 10-3?
O 1x 10-6
O 1x 10-1
0 1x 103
O 1 x 105
Answer:
Option (d) is correct.
Explanation:
Let [tex]x=10^2[/tex] and [tex]y=10^{-3}[/tex].
We need to find the value of [tex]\dfrac{x}{y}[/tex].
Put the values of x and y such that,
[tex]\dfrac{x}{y}=\dfrac{10^2}{10^{-3}}\\\\=10^2\times 10^3\ (As\ \dfrac{1}{x^{-a}}=x^a)\\\\=10^5\ (As\ x^a\times x^b=x^{ab})\\\\=1\times 10^5[/tex]
So, the required answer is equal to [tex]1\times 10^5[/tex]. Hence, the correct option is (d).
Enter an equation showing how this buffer neutralizes added aqueous acid (HI). Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
[tex]H^++NH_3\rightleftharpoons NH_4^+[/tex]
Explanation:
Hello there!
In this case, since the buffer is not given, we assume it is based off ammonia, it means the ammonia-ammonium buffer, whereas the ammonia is the weak base and the ammonium ion stands for the conjugate acid. In such a way, when adding HI to the solution, the base of the buffer, NH3, reacts with the former to promote the following chemical reaction:
[tex]H^++NH_3\rightleftharpoons NH_4^+[/tex]
Because the HI is totally ionized in solution so the iodide ion becomes an spectator one.
Best regards!
Answer:
the above answer is wrong
Explanation:
its really not but the mastering chemistry says it is
Which best explains why ionization energy tends to decrease from the top to the bottom of a group? The number of orbitals decreases. The number of neutrons decreases. Electrons get closer to the nucleus. Electrons get farther from the nucleus.
Answer:
Electrons get farther from the nucleus.
Explanation:
By going from the top to the bottom of a group, the atomic number increases. That would mean that:
The number of orbitals increases, as there are more electrons.A higher atomic number implies an increasing number of neutrons.As there are more electrons, they get farther from the nucleus. The farther an electron is from the nucleus, the easier it is for the electron to be removed from the atom.Ionization energy decreases down the group because electrons get farther from the nucleus hence they are easier to remove.
Ionization energy refers to the energy required to remove an electron from an atom. The ionization energy is a periodic trend that decreases down the group but increases across the period.
The ionization energy decreases down the group because electrons get farther from the nucleus hence they are easier to remove.
Learn more: https://brainly.com/question/16243729
ASAP. Which process represents a physical change?
1.Roasting a marshmallow over a camp fire
2.Melting chocolate in a pan on the stove
3.Bruising of a banana's skin after dropping on the floor
4.Bubbling due to an antacid tablet in vinegar
Calculate the amount (in moles) of magnesium in 1.23 g.
Answer
0.32 is that answer
Explanation:
you just use the calculator
1.35 m solution NaOCl in water is prepared. What is the mole fraction of the NaOCl?
Answer:
NaOCl + H2O → HOCl + NaOH
so the mole fraction is = moles of NaOCl/(moles of NaOCl+moles of H2O)
so for 1.35 NaOCl it will require 1.35 moleof H2O
mole fraction = 1.35/(1.35+1.35)
mole fraction = 1/2 =0.5
is it correct i d ek but i tried :)
The mole fraction of the NaOCl is 0.0237
We'll begin by calculating the mole of solute (NaOCl) in the solution.
Molality = 1.35 mMass of water = 1 KgMole of NaOCl =?Mole = Molality x mass (Kg) of water
Mole of NaOCl = 1.35 × 1
Mole of NaOCl = 1.35 mole
Next, we shall determine the mole of water.
Mass of water = 1 Kg = 1000 gMolar mass of water = 18.01 g/mol Mole of water =?Mole = mass / molar mass
Mole of water = 1000 / 18.01
Mole of water = 55.52 moles
Finally, we shall determine the mole fraction of NaOCl.
Mole of NaOCl = 1.35 moleMole of water = 55.52 moles Total mole = 1.35 + 55.52 = 56.87 moles Mole fraction of NaOCl =?Mole fraction = mole / total mole
Mole fraction of NaOCl = 1.35 / 56.87
Mole fraction of NaOCl = 0.0237
Learn more about mole fraction:
https://brainly.com/question/26051051
1)
Steel Wool Experiment
Before
Observations
After
Observations
Appearance
Steel wool dark gray,
Balloon deflated
Appearance
Steel wool dark
brown; Balloon
inflated
Mass (9)
485.68
Mass (9)
The students data can be seen here. A chemical reaction clearly took
place in the flask. One entry is missing: the mass of the system at the
end of the experiment. What amount should be added to the data
table?
Answer:
Chemical reactions, chemistry, science as inquiry and data analysis. ... Students burn steel wool in both an open and closed environment to understand ... The difference in mass for this small sample of steel wool will be very small. ... careful attention to the balloon! 9. When rusting occurs the properties of the metal changes.
Explanation:
#1 pls help me complete
Answer:
n = 0.045 mol.
Explanation:
Hello there!
In this case, according to the given problem, we can firstly set up the ideal gas equation as shown below:
[tex]PV=nRT[/tex]
Thus, as we are asked to calculate the moles, we proceed as follows:
[tex]n=\frac{PV}{RT}[/tex]
Therefore, we plug in the given data to obtain:
[tex]n=\frac{760mmHg*\frac{1atm}{760mmHg}*1.0L}{0.08206\frac{atm*L}{mol*K}*273K} \\\\n=0.045mol[/tex]
Best regards!