Answers
Answer:
7
Explanation:
Related Questions
PLEASE HELP. ONLY IF YOU KNOW THE ANSWER
Answers
Answer:
24. B
25. B
26. B
Explanation:
24. As depicted in the image attached, all living organisms including animals undergo cellular respiration, which is the process whereby sugar molecule is broken down to release energy (ATP). In this process, CARBON DIOXIDE (CO2) is released as a product. The equation is as follows:
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
On the other hand, plants undergo a unique process called photosynthesis in order to synthesize their food (sugars) and hereby release oxygen gas in the process. Based on the diagram in option B, plants release oxygen using CO2, while animals release CO2 using O2.
25. The structure depicted in the image of this question is an organelle called MITOCHONDRIA. The mitochondrion is the site of cellular respiration (Krebs cycle and ETC) in eukaryotic cells.
26. Photosynthesis is a metabolic process unique to the cells of autotrophic organisms like green plants. It is the process where they synthesize their food in form of organic molecules using SUNLIGHT as a source of energy.
6CO2 + 6H2O + sunlight → C6H12O6 + 6O2
What characteristic odor would you expect to observe if an alcohol reacted with acidified ethanoic acid?
a. A vinegar-like smell.
b. None.The product would be odorless.
c. A rotten fruit smell.
d. A fruity smell.
Answers
mark me brainliest
Blast furnaces extra pure iron from the iron(III) oxide in iron ore in a two step sequence. In the first step, carbon and oxygen react to form carbon monoxide: 2C + O2--------- 2CO In the second step, iron(III) oxide and carbon monoxide react to form iron and carbon dioxide: Fe2O3 + 3CO ------- 2Fe + 3CO2Suppose the yield of the first step is and the yield of the second step is 79%. Calculate the mass of oxygen required to make 10g of Iron. Be sure your answer has a unit symbol, if needed, and is rounded to the correct number of significant digits.
Answers
Answer:
The mass of O2 that will produce 10 g of Iron, Fe is 6.0 g
Note: The question is missing some details. The complete question is given below:
Blast furnaces extra pure iron from the iron (III) oxide in iron ore in a two step sequence. In the first step, carbon and oxygen react to form carbon monoxide 2C(s)+O2(e) -2CO(« In the second step, iron(III) oxide and carbon monoxide react to form iron and carbon dioxide Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3CO2(g) Suppose the yield of the first step is 90.% and the yield of the second step is 79.%. Calculate the mass of oxygen required to make 10 g of iron. Be sure your answer has a unit symbol, if needed, and is rounded to the correct number of significant digits.
Explanation:
Equation for the two reactions is given below:
Step 1: 2C(s) + O2(g) → 2CO(g)
Step 2: Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)
In the second step 3 moles of CO reacts to produce 2 moles of Fe
Molar mass of CO = 28 g/mol, molar mass of Fe = 56 g/mol
Therefore, 84 g (3 × 28) of CO will produce 112 g (2 × 56) of Fe
10 g of Fe will be produced by 84/112 × 10 g of CO = 7.5 g of CO
However, the actual yield is 79%, therefore, 7.5 g of CO will produce 0.79 × 10 g of Fe = 7.9 g of Fe
Mass of CO that will produce an actual yield of 10 g of Fe = 7.5/7.9 × 10 = 9.50 g of CO
From the first step:
1 mole of O2 reacts to produce 2 moles of CO (molar mass of O2 = 32 g)
32 g of O2 produces 56 g (2 × 28 g) of CO
Mass of O2 that will produce 9.50 g of CO = 32/56 × 9.50 g = 5.43g
However, since the actual yield is 90%, therefore, mass of CO produced = 0.9 × 9.50 = 8.55 g of CO
Mass of O2 that will produce 9.50 g of CO = 5.43/8.55 × 9.50 g = 6.03 g
Therefore, mass of O2 that will produce 10 g of Iron, Fe is 6.0 g
**How many milliliters of water have to be added to 150 mL
of 0.5 M HCl to reduce the concentration to 0.10 M HCl?
Answers
Answer:
I RFID not understand the question?
HURRY!!!!!!!!!!!!!!!!
When James sprayed liquid deodorant under his arm, the spot felt cold. Which sentence best explains why? A. The deodorant evaporates as it absorbs thermal energy from James’s skin. B. The deodorant condenses as it absorbs thermal energy from James’s skin. C. The deodorant evaporates as it transfers thermal energy to James’s skin. D. The deodorant evaporates as it absorbs temperature from James’s skin. E. The deodorant is a liquid that freezes at room temperature and pressure.
Answers
Answer:A. The deodorant evaporates as it absorbs thermal energy from James’s skin.
Explanation:
2
5
Calculate the number of atoms in 0.551 gram of potassium (K
I
Is: 11
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23
Answers
Answer:
8.51 x 10²¹ atoms
Explanation:
Given parameters:
Mass of K = 0.551g
Unknown:
Number of atoms = ?
Solution:
To find the number of atoms in this given substance, we need to solve for the number of moles first.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Now;
Molar mass of K = 39g/mol
Number of moles = [tex]\frac{0.551}{39}[/tex] = 0.014mole
Therefore,
1 mole of a substance contains 6.02 x 10²³ atoms
0.014 mole of K will contain 0.014 x 6.02 x 10²³ = 8.51 x 10²¹ atoms
Genetically engineered crops (3 points)
A. are often unsuccessful
B. create optimum soil
C. increase crop yields
D. prevent weed growth
Answers
Answer:
C. increase crop yields
Explanation:
Genetically modified organisms are those organisms that have been improved using genetic engineering procedures. Genetic engineering/modification is the manipulation of an organism's genome in order to get an improved organism with desirable traits.
The organisms being genetically modified or engineered is called GMO or transgenic organisms. Hence, in this case, one feature of the crops being genetically modified is to have an INCREASED YIELD.
A sample of Neon and Helium gases at 298 K have a total pressure of 29 atm. If the partial pressure of He is 6 atm, what is the mole fraction of neon?
Answers
Nazeeh conducted an experiment to demonstrate the law of conservation of matter. He burned a strip of magnesium that had a beginning mass of 5.0 g over an open flame. The magnesium gave off a bright white light and smoke as it was being burned. The white ash that was left over had a mass of 4.5 g. Nazeeh concluded that his experiment did not uphold the law of conservation of matter.
What did Nazeeh NOT take into consideration when drawing his conclusion?
A
that some of the mass was lost to the air as light
B
that mass has absolutely no relationship to matter
C
that some of the mass was lost to the air as smoke
D
that ash has a lower mass than the strip of magnesium
Answers
Answer:
C
that some of the mass was lost to the air as smoke
Answer:
C
Explanation:
A: Light isn´t part of the mass of magnesium, light is energy, it doesn´t occupate space.
B: Mass clearly have a relationship with matter, if you increase the amout of mass, you will increase the amout of matter, one way or another.
C: It is correct, some of the mass was lost because hot gases tend to go up.
D: Yes, the ash has a lower mass than magnesium, but it is not because ash is lighter or something like that. It is because some of the ash was lost due to the air.
What is the frequency of green light
that has a wavelength of 531 nm? (c
= 3.00 x 108 m/s)
Answers
We are given:
Wavelength of Green light (λ) = 531 nm OR 531 * 10⁻⁹ m
Speed of light (c) = 3* 10⁸ m/s
Solving for the Frequency of the wave:
We know the relation:
c = νλ
(where ν is the frequency, c is the speed of light and λ is the wavelength)
3*10⁸ = ν*(531*10⁻⁹)
ν = 3*10⁸ / 531*10⁻⁹ [dividing both sides by the wavelength]
ν = 3*10⁸*10⁹ / 531 [ since a⁻¹ = 1/a]
ν = 3*10¹⁷ / 531 [ since mᵃ * mᵇ = mᵃ⁺ᵇ]
ν = 10¹⁷ / 177
ν = 1000 * 10¹⁴ / 177 [we split the numerator to simplify]
ν = 5.65 * 10¹⁴
Hence, the frequency of Green light is 5.65 * 10¹⁴ Hz
Answer:
f = 5.6×10¹⁴ Hz
Explanation:
Given data:
Wavelength of green light = 531 nm (531×10⁻⁹ m)
Frequency of green light = ?
Solution:
Formula;
Speed of wave = wavelength × frequency
Speed of wave = 3.00×10⁸ m/s
by putting vales,
3.00×10⁸ m/s = 531×10⁻⁹ m × f
f = 3.00×10⁸ m/s / 531×10⁻⁹ m
f = 0.0056×10¹⁷ s⁻¹
f = 5.6×10¹⁴ Hz (Hz = s⁻¹)
A quantity of HI was sealed in a tube, heated to 425°C and held at this temperature until
equilibrium was reached. The concentration of Hl in the tube at equilibrium was found to be
0.0706 mol/L. Calculate the equilibirum concentration of H2 (and 12). For the gas-phase
reaction,
H2 + 2 = 2HIKc = 54.6 at 425°C
O a. 1.17 x 10-3M
O b. 2.34 x 10-3M
c. 9.55 x 10-3M
d. 1.85 x 10-4 M
e. 4.78 x 10 PM
Answers
The equilibrium concentration of H₂ : c. 9.55 x 10⁻³ M
Further explanationGiven
Kc = 54.6 at 425°C
The concentration of Hl = 0.0706 mol/L
Required
The equilibrium concentration of H₂ (and I₂)
Solution
[tex]\tt Kc=\dfrac{[HI]^2}{[H_2][I_2]}\\\\54.6=\dfrac{0.0706^2}{[H_2][I_2]}[/tex]
[H₂][I₂]=[H₂]²
[tex]\tt [H_2][I_2]=\dfrac{0.0706^2}{54.6}=[H_2]=9.55\times 10^-3~M[/tex]
The gas phase concentration of H2 and I2 is 9.55 x 10-3M.
The equation of the reaction is;
H2 + I2 ------> 2HI
We also have the information that the equilibrium constant of the process is 54.6.
Now recall that;
Kc = 2HI/[H2] [I2]
We can assume that the concentration of H2 = concentration of I2
Hence; [H2] = [I2] = x
54.6 = [0.0706]^2/x^2
54.6x^2 = [0.0706]^2
x = √ [0.0706]^2/54.6
x = 9.55 x 10-3M
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how many atoms of San are in 0.796 moles of this element
Answers
Answer:
4.8× 10²³ atoms
Explanation:
Given data:
Number of moles of San element = 0.796 mol
Number of atoms present = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
0.796 mol × 6.022 × 10²³ atoms / 1mol
4.8× 10²³ atoms
Which is a property of potassium (K)? O A. It is dull and brittle. O B. It is not reactive. O C. It is white and hard. D. It is extremely reactive.
Answers
Answer:
D. It is extremely reactive.
Explanation:
Hello!
In this case, since potassium is an alkali metal, it is known those are extremely reactive because the energy required to ionize them is very low, it means they react so easily. For instance, even in the presence of water, potassium is able to react and form a purple flame as a product of the reaction:
[tex]2K+2H_2O\rightarrow 2KOH+H_2[/tex]
As well as potassium, the rest of the elements belonging to the alkali metals series are extremely reactive; therefore the answer is D. It is extremely reactive.
Best regards!
1) Which of the following statements are correct? Rewrite each false statement to make it true.
a) Elements listed in rows on the periodic table are in the same family.
b) Elements in the same column of the periodic table exhibit the same physical properties
c) Elements in the same group are in the same family.
d) Elements that are side by side on the periodic table belong to the same period.
21 Mamath
Answers
Answer:
a) Elements listed in rows on the periodic table are in the same family - false
Explanation:
Elements listed in groups /columns on the periodic table are in the same family.
The false statement is:
a) Elements listed in rows on the periodic table are in the same family.
Elements in the periodic table:In a periodic table, the elements are arranged in increasing order of atomic number. There are 7 periods and 18 groups in a periodic table.
The statement which is false is:
a) Elements listed in rows on the periodic table are in the same family.
The correct statement will be:
a) Elements listed in rows on the periodic table belongs to a different family.
These elements will have different properties and thus placed in periodic table.
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whats the answerrrr giving brainliest
Answers
I hope this will help a bit (Forgive me of its wrong pls)
A large balloon contains 5400 m3 of He gas that is kept at a temperature of 280 K and an absolute pressure of 1.10 x 105 Pa. Find the mass of He inside the balloon. (Molar mass of He : 4.002 g/mol)
Answers
Answer:
1.02 × 10⁶ g
Explanation:
Step 1: Given data
Volume of the balloon (V): 5400 m³Temperature (T): 280 KAbsolute pressure (P): 1.10 × 10⁵ PaMolar mass of He (M): 4.002 g/molStep 2: Convert "V" to L
We will use the conversion factor 1 m³ = 1000 L.
5400 m³ × 1000 L/1 m³ = 5.400 × 10⁶ L
Step 3: Convert "P" to atm
We will use the conversion factor 1 atm = 101325 Pa.
1.10 × 10⁵ Pa × 1 atm / 101325 Pa = 1.09 atm
Step 4: Calculate the moles of He (n)
We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 1.09 atm × 5.400 × 10⁶ L / 0.08206 atm.L/mol.K × 280 K
n = 2.56 × 10⁵ mol
Step 5: Calculate the mass of He (m)
We will use the following expression.
m = n × M
m = 2.56 × 10⁵ mol × 4.002 g/mol
m = 1.02 × 10⁶ g
28. Describe the molecular geometry and hybridization of the N, P, or S atoms in each of the following compounds. (a) H3PO4, phosphoric acid, used in cola soft drinks (b) NH4NO3, ammonium nitrate, a fertilizer and explosive (c) S2Cl2, disulfur dichloride, used in vulcanizing rubber (d) K4[O3POPO3], potassium pyrophosphate, an ingredient in some toothpastes
Answers
Answer:
See explanation
Explanation:
The molecular geometry of an atom is connected to the number of electron pairs that surround it(whether lone pairs or bonding pairs) as well as its hybridization state. We shall now examine the N, P, or S atoms in each of the following compounds.
a)
In H3PO4, P has a tetrahedral molecular geometry and is sp3 hybridized.
b) In NH4NO3
N is sp3 hybridized in NH4^+ and sp2 hybridized in NO3^-. Also, N is tetrahedral in NH4^+ but trigonal planar in NO3^-.
c) In S2Cl2, we expect a tetrahedral geometry but as a result of the presence of two lone pairs on each sulphur atom, the molecular geometry is bent. The sulphur is sp3 hybridized.
d) In K4[O3POPO3], each phosphorus atom is in a tetrahedral molecular geometry and is sp3 hybridized.
What is electronegativity
Answers
Answer:
Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons (or electron density). An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.
HELP please. Only if your POSITIVE
Answers
Answer:
B.
Explanation:
The two reactions shown in the attached image depicts the processes of photosynthesis and cellular respiration. Photosynthesis is the process whereby autotrophic organisms use CO2 (carbon dioxide) and H2O (water) in the presence of sunlight to make glucose (C6H12O6). The equation is as follows:
6CO2 + 6H2O + sunlight → C6H12O6 + 6O2
On the contrary is the process of cellular respiration, which involves the breakdown of glucose (sugar) in order to release energy (ATP). The equation is as follows:
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
According to this question, the option B which says that "Sugar is broken down to release energy" is CORRECT.
PLEASEEEEEEEEEEEE HELP 100 POINTS PLEASEEEE Sofia has two 10-gram samples of sea salt. One sample is finely ground into thousands of tiny grains of salt. The other sample is a single block of salt crystals. Sofia tries to dissolve each sample in a separate glass of water. Which sample will dissolve first?
A.the finely ground sample because it has more surface area
B.the single block because it has more surface area
C.the single block because it has less surface area
D.the finely ground sample because it has less surface area
Answers
Answer:
the answer is D to this question
The capability of a gaseous, solid or liquid component to dissolve in the solvent to yield a solution is called solubility. Solubility depends on the exterior area of the substance.
The correct answer is:
Option A. The finely ground sample because it has more surface area.
This can be explained as:
The rate of desolvation of the solute is dependent on the surface area of the solute.The grounded particle of a substance dissolves faster as compared to the large particles.The solubility of solute depends on the surface area. The large surface area of compounds increases the contact rate of solute with the solvent.Therefore, the finely ground sample will dissolve fast.
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Naming Ionic Compounds.
What is the neutral Ionic Compound name of Be^+2 & S^-2?
What is the neutral Ionic Compound name of Pb^+2 & CO3^-2?
Answers
Answer:For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion. For example, KCl, an ionic compound that contains K+ and Cl- ions, is named potassium chloride.
Explanation:
How many unpaired electrons does calcium have? You may need to draw the orbital filling diagram for the last sublevel that contains electrons.
A) 0
B) 2
C) 4
D) 1
Answers
Answer:
0
Explanation:
Ca has 20 electrons
What type of reaction is P4 + 3O2 = 2P2O3
Answers
Answer:
synthesis
Explanation:
hope this helps
The given reaction is a type of synthesis reaction.
• The reactions, which takes place when two distinct molecules or atoms associate to produce a distinct molecule or compound is known as synthesis reactions.
• The synthesis reactions are one of the prime categories of chemical reactions that comprise combustion reactions, single displacement, and double displacement reactions.
• In synthesis reactions, energy is released and the reaction is exothermic, in some cases, endothermic is also possible.
• In the given reaction atoms of phosphorus and oxygen combines to produce the compound phosphorus oxide.
Thus, the given case is an example of synthesis reaction.
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Which object will experience the least amount of gravitational attraction toward Earth?
a 5-gram pencil
a 40-gram eraser
a 75-gram calculator
a 380-gram cup
Answers
All objects, regardless of their mass, experience the same gravitational acceleration due to Earth's gravity (approximately 9.81 m/s^2 near the surface of the Earth).
Therefore, all objects will experience the same amount of gravitational attraction towards Earth. However, the force of gravity acting on an object is directly proportional to its mass, so a 5-gram pencil will experience the least amount of gravitational force (weight) compared to the other objects mentioned.
What is gravity?
Gravity is a fundamental force of nature that causes objects with mass to attract each other. It is one of the four fundamental forces of nature, along with electromagnetism, the strong nuclear force, and the weak nuclear force.
Gravity is responsible for the motion of objects in the universe, from the orbits of planets and moons around their parent bodies, to the formation of galaxies and the universe itself. The strength of the gravitational force between two objects depends on the mass of the objects and the distance between them. The larger the mass of the objects, the greater the gravitational force, and the closer the objects are to each other, the greater the gravitational force.
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#SPJ1
Answer:
Pencil?
Explanation:
Doing test rn
NEED HELP ON 17,18,19,20,21,22,23. ONLY IF YOU ARE POSITIVE ABOUT THE ANSWER!!!!
Answers
Answer:
17. D. Chemical change
18. C. Cell wall
19. D. To transfer matter and energy within and between organisms.
20. A. Transporting materials
21. C. Carbon dioxide
22. A. Cellular respiration
23. C. Produce food and give off oxygen
Explanation:
I have been able to supply the correct answers. The cell wall functions as a structure that provides structural support and protection to the cell. It is tough, flexible and at times rigid. In a chemical change, new materials with new properties are manufactured. So, the process of photosynthesis is a chemical change.
The endoplasmic reticulum actually transports material. It transports materials like protein and lipids made within the cell and sends it to where they are needed.
Carbon dioxide is the the gas that animals give off and plants use it during photosynthesis. Cellular respiration involves the activities that result to the breaking down of food in order to release energy.
An unknown compound has the following chemical formula: where stands for a whole number. Measurements also show that a certain sample of the unknown compound contains of nitrogen and of oxygen. Write the complete chemical formula for the unknown compound.
Answers
The question is incomplete, the complete question is;
An unknown compound has the following chemical formula:
N2Ox
where x stands for a whole number.
Measurements also show that a certain sample of the unknown compound contains 3.7 mol of oxygen and 2.45 mol of nitrogen.
Write the complete chemical formula for the unknown compound.
Answer:
The complete formula of the compound is N2O3.
Explanation:
Given;
Number of moles of N = 2.45 moles
Number of moles of O = 3.7 moles
Chemical formula of unknown compound = N2Ox
From the ratio of the number of moles of N to O;
2/x = 2.45/3.7
2 * 3.7 = x * 2.45
x = 2 * 3.7/ 2.45
x =3
Hence the complete formula of the compound is N2O3.
QUESTION TWO
(a) Derive Nernst equation for measuring the EMF of the cell
(b) Calculate the emf of the cell
[3]
Zn Zn? (0.001M)|| Agt (0.1M)| Ag
The standard potential of Ag/Ag half-cell is +0.80 V and Zn/Zn. is -0.76 V
(c) Name different types of standard electrodes used for the determination of pH
of a solution by EMF measurement Discuss the working of Glass Electrode
for the determination of pH of a solution
(d) 0.1978 g of copper is deposited by a current of 0.2 ampere in 50 minutes.
What is the electrochemical equivalent of copper?
[3]
Answers
Answer:
Screenshot
Explanation:
Which is immiscible with water?
Select one:
CH2
/
O a.
-CH2
HỌC-CH2
O b. H3C—CH —OH
Ос.
CH;
-CH3
Ods=C=S
e. NHI
Answers
Answer:
f
Explanation:
A group of organs working together to perfrom a certain function called
Answers
Answer:
group. hfdzybidddiklllnjjooolll
Answer:
An organ system
Explanation:
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What the answer giving brainliest:) HELP
Answers
Answer:
I think it's tornado
Explanation:
Answer: should be d. then
(sorry if im wrong)
:(
i feel so stupi.d
(i changed my answer to d.)