Answer: a communicable disease
Explanation: key word was transmitted and it was transmitted from a INFECTED living thing and then transmitted to another living thing
carbon monoxide reacts with iron (ii, iii) oxide (fe3o4) making iron and carbon dioxide. when a student performed the experiment she reacted 70.0 g of fe3o4 with 70.0 g of co and the actual yield of iron was 41.9. calculate the percentage yield.
Please help me!
The percent yiled shows the extent of conversion of reactants to products. The percent yiled here is 83.1%.
Percent yieldThe percent yiled in a reaction is calculated as te ratio of the actual yield to the theoretical yiled multiplied by 100.
Hence the balanced reaction equation is; Fe3O4 + 4CO → 3Fe + 4CO2.
Number of moles of Fe3O4 = 70.0 g/232 g/mol = 0.3 moles
Number of moles of CO = 70.0 g/28 g/mol = 2.5 moles
If 1 mole of Fe3O4 reacts with 4 moles of CO
x moles of Fe3O4 reacts with 2.5 moles of CO
x = 0.6 moles
Hence, Fe3O4 is the limiting reactant.
Now;
1 mole of Fe3O4 yileds 3 moles of Fe
0.3 moles of Fe3O4 yileds 0.3 moles * 3 moles/1 mole = 0.9 moles
Mass of Fe produced = 0.9 moles * 56 g/mol = 50.4 g
Percent yield = 41.9 g/ 50.4 g * 100/1 = 83.1%
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as star luminosity increases what else increases? (check all that apply)
a) carbon
b) temperature
c) size
d) nitrogen
Answer:
C
Explanation:
As the size of a star increases, luminosity increases. If you think about it, a larger star has more surface area. That increased surface area allows more light and energy to be given off.
We looked at the acrylonitrile molecule, c3h3n, in the previous exercise. Which of the following statements about the molecule is or are true? i. The c—c single bond results from overlap between an sp hybrid and an sp 2 hybrid. Ii. There are two unhybridized p orbitals on the n atom. Iii. All the atoms in the molecule lie in the same plane.
The true statemments that reflect the nature of the compound are statements (i) and (ii).
What is acrylonitrile?The molecule acrylonitrile has thre carbon and hydrogen atoms and one nitrogen atom. The c—c single bond results from overlap between an sp hybrid and an sp 2 hybrid. Also, there are two unhybridized p orbitals on the N atom.
Hence; among the options, the true statemments that reflect the nature of the compound are statements (i) and (ii).
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1. How many grams of NaOH are contained in 5.0 x 10^2mL of a 0.74 M sodium hydroxide solution?
a. 15 g
b. 74 g
c. 0.37 g
d. 30 g
e. 370g
How much energy in Joules is required to convert 10 grams of ice at -10 °C to +10 °C water. s water = 4.18 joule/gram °C, sice = 2.09 joule/gram °C, Hfus 334joule/gram
Answer:
don't know just supporting u
A chemical reaction that has the general formula of ab c → cb a is best classified as a reaction.
Answer:
single replacement
Explanation:
Single replacement is when the molecules switch with each another
for example:
Zn + CuCl₂→ZnCl₂ +Cu
Answer:
replacement
Explanation:
the molar solubility of x2s in pure water us 0.0395
The Ksp shows the extent of dissolution of a solute in solution. The Ksp of the solution is 2.5 * 10^-4.
What is Ksp?The Ksp is an equilibrium constant that is usd to show the extent of solubility of a solute in solution.
The equation for the solution of X2S is;
X2S(s) ⇄2X^+(aq) + S^2-(aq)
Ksp = [2s]^2 [s]
Since s = 0.0395 M
Ksp = 4s^3
Ksp = 4[0.0395 ]^3
Ksp = 2.5 * 10^-4
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sodium chloride procedure
Answer: Dissolve approximately 3 mg of Sodium Chloride in 2 mL of water.
Add 0.4 mL of silver nitrate TS and acidify with diluted nitric acid.
What is the apparent brightness of a star?
How bright it actually is
How bright it is compared to the sun
How bright it is from Earth
How bright it is from a certain distance
Answer:
it's bright where you can see it it's not that bright compared to the sun from Earth it's really not so bright
Which of the following aqueous solutions will have a pH that is significantly different from the rest?
0.1 M H 2SO 4
0.1 M HNO 3
0.1 M HC 2H 3O 2
0.1 M HCl
Among the given aqueous solutions, the solution with a significantly different pH from the rest is 0.1 M HC₂H₃O₂ (acetic acid).Option C
H₂SO₄ (sulfuric acid), HNO₃ (nitric acid), and HCl (hydrochloric acid) are strong acids that dissociate completely in water. They produce a high concentration of H₃O⁺ ions, resulting in a low pH. Acetic acid, on the other hand, is a weak acid that only partially dissociates in water. It produces a smaller concentration of H₃O⁺ ions, resulting in a higher pH compared to the strong acids.
When a strong acid like HCl, H₂SO₄, or HNO₃ is dissolved in water, it completely dissociates to release H₃O⁺ ions. The resulting solution will have a very low pH, usually close to 0. However, acetic acid (HC₂H₃O₂) only partially dissociates, and the concentration of H₃O⁺ ions is lower. As a weak acid, it has a higher pH compared to strong acids, typically around 2.4.
In summary, among the given options, the aqueous solution of 0.1 M HC₂H₃O₂ (acetic acid) will have a significantly different pH from the rest, with a higher pH value due to its weak acid nature.
Option C
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Question 1
13 pts
When cells divide they ____
Answer:
multiply (make new cells)
2. Which was the independent variable in the experiment below? *
3 points
A. Amount of light
B. Soil type
C. Temperature
D. Health of plant
Answer:
I think it is C. Temperature, sorry if wrong.
The vertical columns on the periodic table are known as:.
Answer:
groups
Explanation:
In chemistry, the vertical columns are known as groups and the horizontal columns are known as periods.
07. 2
Explain why caesium is more reactive than sodium.
You should answer in terms of electrons.
Which of these elements is the odd one out? Li Na Mg K Rb Cs
(9) Which is true from the following ?
(A) Size of A1+ < Size of Al (B) Size of A1+ > Size of Al
(C) Size of F < Size of F (D) Size of Nat = Size of Na
(10) For which element the highest shielding effect for outermost electron is observed ?
(A) Element of group 13 and period 2 (B) Element of group 13 and period 3
(C) Element of group 13 and period 4 (D) Element of group 13 and period 5
(11) Which one is the descending order of atomic radius of elements of third period.
Na(Z = 11), Mg (Z = 12), Al (Z = 13) and Si(Z = 14) ?
(A) Si > Al > Mg > Na (B) Na > Mg > Al > Si
(C) Na < Mg < Al < Si (D) Na > Al > Mg >Si
(12) Which order is true with reference to size of species ?
(A) Pb < Pb2+ < Pb++
(B) Pb4! > Pb2+ > Pb
(C) Pb > Pb2+ > Pb4+
(D) Pb2+ < Pb < Pb4+
Answer:
The correct answer is A and D.
Explanation:
Please I want brainliest.
Reason:
The size of the ions follows the order:
Negatively charged ion > Neutral atom >
Positively charged ion
This is because of the size of ions increases when the electrons are added to the outermost shell of an atom.
This happens due to the increase in
electron-electron repulsion.
Moreover, when the electrons are removed from an atom, then the affective nuclear charge that is experienced by the outermost electron increases.
Thus the size of the positively charged ion is least.
Calculate the power developed in R1.
P1 =_____watts
48
190
240
1300
the answer will be 190
Explanation:
because R1= 0.5*0.5*8
=190
how do you prepare saturated solution NaCl at 40°c?
Please answer this
The compound CO2(s) sublimes readily at 25°C. Which properties are usually associated with a compound that undergoes this kind of change?
1. High vapor pressure and high intermolecular attractions
2. High vapor pressure and low intermolecular attractions
3. Low vapor pressure and high intermolecular attractions
4. Low vapor pressure and low intermolecular attractions
What are three disadvantages of visible light
Answer:
Eye Health Problems.
Vision-Related Accidents.
Deterioration of Materials.
Explanation:
Martin makes new cereal flavors for a major corporation. Which type of research tool would BEST help him to determine if people enjoy the new flavors?
Answer:
Surveys
Explanation:
Martin can make an interaction with people and take surveys to know whether people likes the new flavors.
What are surveys?Surveys are research techniques used to gather data from a designated group of respondents in order to learn more and acquire insights into a range of interesting topics. Depending on the methodology chosen and the objective of the study, they can be conducted in a variety of methods and serve a variety of objectives.
Direct questions to clients are the best approach to get information from them. Surveys are a good way to achieve it if you have a well-thought-out strategy.
Companies can use surveys to gather data to develop strategies and maintain the satisfaction of their employees and consumers while looking for solutions based on the results.
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In what organelle or membrane are triacylglycerols synthesized and fatty acids elongated?.
1 - In what organelle or membrane are triacylglycerols synthesized and fatty acids elongated?
A - Lysosomes
B - Peroxisome
C - Endoplasmic reticulum
D - Ribosomes
E - Nucleus
The answer is Endoplasmic reticulum
Which describes isotopes? check all that apply. isotopes have the same atomic mass. isotopes have the same atomic number. isotopes are always stable. isotopes are always radioactive. isotopes are stable or radioactive. isotopes have different mass numbers.
Answer:
See below
Explanation:
Isotopes:
are atoms of the same element.have same number of electrons and protons.have different number of neutrons.have same atomic number.have different mass number.are either stable or reactive.Example:
Hydrogen has three isotopes, protium, deutrium and tritium.Chlorine has two isotopes, Chlorine-35 and chlorine-37.[tex]\rule[225]{225}{2}[/tex]
Any group of an element's isotopes will always contain an equal amount of protons and electrons. Their individual nuclei's capacity for holding neutrons will vary. The correct options are B, D, and F.
A set of atoms with the same atomic number but differing masses is known as an element's isotope. This indicates that the number of protons in each atomic nucleus and the number of electrons in the electron cloud of each isotope of an element is the same.
Some isotopes experience radioactive decay because of their unstable atomic nucleus. These isotopes are known as radioisotopes (or radionuclides) because they are radioactive by nature. Carbon-14, tritium (hydrogen-3), chlorine-36, uranium-235, and uranium-238 are a few examples of radioactive isotopes.
Thus the correct options are B, D, and F.
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Ok take two tell me if u can see it or not it's #9
ANSWER DISCLAIMER; IF DISSATISFIED, REPORT THIS ANSWER AS SOON AS POSSIBLE:
*This may not be an option but this is most definently another way of saying the answer, through this, learning can be improved instead of giving the answer right off the bat.*Answer:
The motion of the gas particles is random and in a straight-line.
Explanation:
According to the kinetic hypothesis, a gas is made up of a huge number of submicroscopic particles (atoms or molecules) that are all in continual, random motion. The swiftly moving particles clash with one another and with the container's walls on a regular basis. The phrase ideal gas refers to a hypothetical gas made up of molecules that adhere to a few rules: The molecules of an ideal gas do neither attract or repel one another. The sole interaction between perfect gas molecules would be an elastic collision when they collided or an elastic collision with the container's walls.
If a solute has really strong bonds between its particles, would you expect it to form a solution that gets hold or cold? Explain your reasoning.
Answer:
The temperature of the solute/solvent without any external effect would decrease.
Explanation:
As the bonding between the solute particles is really strong, therefore a large amount of energy is required to overcome these forces. So that the new bonding between the solute and solvent is created.
In order to achieve this, there will be a lot of energy required and that is through the heating process. So the solution will require energy so the solute will dissolve fully either by provision of external force i.e stirring or by heating.
Explanation:
A solution contains 5. 120 moles of Li2SO3 with a molarity of 6. 750 M. What is the volume of this solution
Answer: 0.759 L
Explanation:
molarity = moles of solute / liters of solution
so, 6.750 = 5.120 / liters of solution
liters of solution = 5.120/6.750 = 0.759 L
Are all types of bacteria harmful? Explain
Answer:
No, not all are harmful.
Explanation:
There are bacterias that are harmful, yes, but millions, maybe even billions are helpful. Probiotics, healthy bacteria, as some like Lactobacilli and Bifidobacterium. There are a lot more, but just these two examples are helpful. Lactobacili is helpful with your digestive system. Bifidobacterium is geared towards your mouth and the vaginal area of women in mammals, like humans.
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I hope this helps!
-No one
Balancing _CH4+_CO2=_CCl4+_HCL
Explanation:
the equation is wrong, please make sure you typed it correctly. because there is no way methane and carbon dioxide can give carbon tetra chloride and hydrogen chloride gas. It's impossible, the reactants and products donot match. Re-write the equation correctly again
WILL GIVE BRAINLIEST PLEASE HELP! What is the pH of a solution with a concentration of hydronium ions of 8.42 × 10–5?
Answer:
[tex]pH = -log(H3O^+) = -log(8.52E-5) = 4.+[/tex], my guess is about 4.1
Explanation:
hope this helps! :)
The pH of a solution prepared by dissolving 0. 350 mol of solid methylamine hydrochloride (CH3NH3Cl) in 1. 00 L of 1. 10 M methylamine (CH3NH2) is ________. The Kb for methylamine is 4. 40 ⋅ 10-4. (Assume the final volume is 1. 00 L. )
For the pH of a solution prepared by dissolving 0. 350 mol of solid methylamine hydrochloride, the pH is mathematically given as
pH = 11.14
What is the pH value of a solution prepared by dissolving 0. 350 mol ?Generally, the equation for the pKb is mathematically given as
pKb = -logKb
Therefore
pKb of CH3NH2 = -log(4.40×10-4)
pKb of CH3NH2= 3.36
Hence
pKa= 14 - pKb
pKa= 14 - 3.36
pKa= 10.64
In conclusion, using
pH = pKa + log([A-]/[HA])
pH = 10.64 + log(1.10M/0.350M)
pH = 11.14
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