Answer:
This question is incomplete. A fragment of the question is missing. The fragment is:
She finds that 4.87 g of oxygen gas is produced
0.152 moles
Explanation:
Using the formula: mole = mass / molar mass
According to the question, a chemist measures the amount of oxygen gas produced during an experiment. Oxygen gas has the chemical formula: O2. Hence, the molar mass will be:
O2 = 16(2) = 32g/mol
If the mass of the oxygen gas to be 4.87 g of oxygen gas.
Therefore,
moles = 4.87/32
moles = 0.152mol
NEED HELP ON 17,18,19,20,21,22,23. ONLY IF YOU ARE POSITIVE ABOUT THE ANSWER!!!!
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.
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
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.
how do we calculate standard electrode potentials
Explanation:
[tex]answer[/tex]
The overall cell potential can be calculated by using the equation E0cell=E0red−E0oxid. Step 2: Solve. Before adding the two reactions together, the number of electrons lost in the oxidation must equal the number of electrons gained in the reduction. The silver half-cell reaction must be multiplied by two.
Use the graph to answer these questions. The total energy of the reactants is –3,811.92 kJ. –1,273.02 kJ. –2,538.90 kJ.
Answer:
its -3,811.92 aka.) A
Explanation:
The overall enthalpy of the reaction is represented in the graph by the letter A. The activation energy is represented by the letter B and the activated complex is represented by C.
What is an energy diagram of a reaction ?The energy diagram of a reaction represents the energy change with respect to the rate of the reaction. It clearly depicts the energy profile of reactants and products, transition state of the reaction, activation energy and the overall enthalpy of the reaction.
The given diagram represents the energy profile for the photosynthetic reaction. The state with the highest activation energy is called transition state of the reaction. The minimum energy that must be acquired by the reactants to overcome the barrier potential is called activation energy.
For the given graph, the activation energy is represented by the letter B. The overall enthalpy of the reaction is represented in the graph by the letter A and the activated complex is represented by C.
Find more on energy diagram :
https://brainly.com/question/30260225
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Your question is incomplete. But your complete question probably was:
Letter__shows the overall enthalpy of reaction.
Letter___shows the activation energy for the reaction
The activated complex is represented by
You have 165.5 g of Ba(OH)2.
How many moles of barium ions are present in part 1?
_____ mol Ba2+
How many moles of hydroxide ions are present in Part 1?
_____ mol OH1-
Answer:
moles of Ba²⁺ : 0.97 mol
Moles of OH⁻ : 1.94 mol
Explanation:
Given data:
Mass of Ba(OH)₂ = 165.5 g
Moles of barium ions = ?
Moles of hydroxide ion = ?
Solution:
Number of moles of barium hydroxide:
Number of moles = mass/molar mass
Number of moles = 165.5 g/ 171.34 g/mol
Number of moles = 0.97 mol
one mole of barium hydroxide contain one mole of Ba²⁺ and 2 mole of OH⁻ ion.
Thus in 0.97 moles of barium hydroxide,
moles of Ba²⁺ :
0.97 mol × 1 = 0.97 mol
Moles of OH⁻ :
0.97 mol × 2= 1.94 mol
Calculate the mole fraction of each solute and solvent in the solution of 46.85 g of codeine, C 18 H 21 NO 3 , in 125.5 g of ethanol, C 2 H 5 OH.
mol fraction Codein : 0.054
mol fraction Ethanol : 0.946
Further explanationGiven
46.85 g of codeine
125.5 g of ethanol
Required
mol fraction
Solution
The mole fraction : the mole ratio of a substance to the mole of solution /mixture
mol Codeine, C₁₈H₂₁NO₃(MW=299.4 g/mol) :
[tex]\tt mol=\dfrac{46.85}{299.4 g/mol}\\\\mol=0.1565[/tex]
mol Ethanol, C₂H₅OH(MW=46.07 g/mol)
[tex]\tt mol=\dfrac{125.5}{46.07}=2.7241[/tex]
mol of solution :
[tex]\tt mol~codein+mol~ethanol=0.1565+2.7241=2.8806[/tex]
mol fraction Codein :[tex]\tt \dfrac{0.1565}{2.8806}=0.054[/tex]
mol fraction Ethanol :
[tex]\tt \dfrac{2.7241}{2.8806}=0.946[/tex]
write the general strucktures of
A. ketone b. aldehyde c. carboxylic acid d. ester
A.ketone
R-CO-R
B.aldehyde
R-CH=O
c.carboxylic acid
R-COOH
d.ester
R-CO-O-C-R
How many moles are in 2.3 x10^25 atoms of phosphorus
Answer:
38.21 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
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
[tex]n = \frac{2.3 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 38.20598...[/tex]
We have the final answer as
38.21 molesHope this helps you
what were the reslt of aurangzeb's religion policy ? what measures did he takes
Answer: The religious fanaticism of Aurangzeb overshadowed his virtues. His reversal of Akbar's policy of religious toleration resulted in weakening the entire structure of the Mughal empire. It led to several conflicts and wars in different parts of the country.
Many plants obtain glucose through the process of ___
Answer:
vb
Explanation:
b
Answer:
photosynthesis
Explanation:
Determine the oxidation number of sulfur in S203 ( with steps)
Answer:
The oxidation number of sulphur in is +2
Explanation:
S2O3 2-
2 (S) + 3(O)=-2
2 (S) + 3(-2)=-2
2 (S) + (-6) =-2
2 S = +4
S= +2
Jasmine and her partner want to test to see if there is a relationship between how much of her solar panel is exposed to sunlight and how fast her solar car will move. She uses a piece of paper to cover the solar panel different amounts of her solar panel. The chart below shows the data she collected.
What is the independent or manipulated variable for this experiment?
The average of the trials
The speed in centimeters per second
The size of the solar panel
The amount of solar panel covered
Answer:
The amount of solar panel covered
Explanation:
The variable that is the independent one is the one that Jasmine is changing. In this case, it is the amount of solar panel covered, via a piece of paper.
Answer:
D: The amount of solar panel covered
Explanation:
True or False: Water is a liquid at – 5 °C.
Answer:
False
Explanation:
Answer:
False
Explanation:
Water's freezing point is at 0 degrees celsius
Which variable increases when potential energy increases?
Answer:
Height and mass
Explanation:
The potential energy of a body is the energy due to the position of a body.
It is mathematically expressed as:
Potential energy = m g h
m is the mass of the body
g is the acceleration due to gravity
h is the height of the body
Acceleration due to gravity on the earth surface is a constant.
As mass and height of a body increases, the acceleration due to gravity will also increase.
Pls help if you can
(It’s actually science i just couldn’t find it)
Answer:
Here you go!!
Explanation:
What is the velocity of a plane that traveled 2,800 miles from New York to California in 5.0 hours?
Answer:
560 mph East
Explanation:
Velocity is just speed with direction pretty much.
If the enantiomeric excess of a mixture is 81 %, what are the percent compositions of the major and minor enantiomer?
Answer:
major enantiomer = 90.5 %
minor enantiomer = 9.5 %
Explanation:
Assuming that the major isomer is in excess;
From, ee/2 + 50
ee = enantiomeric excess = 81%
% major =81/2 + 50 = 90.5 %
% minor = 100% - 90.5 %
% minor = 9.5 %
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.
Answer:A. The deodorant evaporates as it absorbs thermal energy from James’s skin.
Explanation:
HELP IGNORE IF YOU DON'T KNOW BRAINLIEST!!
Commercial vinegar is a 5.00% by mass aqueous solution of ethanoic acid. FIND MOLARITY of ethanoic acid in vinegar. Density of vinegar
is 1.00 g/mL
Answer:
What ever the other person said
Explanation:
whats the answer giving brainliest please help
Answer:
C (I think)
Explanation:
the levels are higher than they have ever been
Ammonia will decompose into nitrogen and hydrogen at high temperature. Calculate the pressure equilibrium constant for the decomposition of ammonia at the final temperature of the mixture
Answer:
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
Explanation:
The reaction for the decomposition of ammonia is given by;
2NH₃ (g) ⇌ N₂ (g) + 3H₂ (g)
The pressure equilibrium constant gives the ratio of the pressure of the product over reactants for a reaction that is at equilibrium.
The pressures of the species are raised to the powers of their respective coefficients.
In this reaction;
Products = N₂ (g) + 3H₂ (g)
Reactant = 2 NH₃ (g)
The pressure equilibrium constant (Kp) is given as;
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
CHEMISTRY HELP!
Can anyone help me understand or explain why my answer was wrong and why the correct answer is right? Please help!
Answer:
Li to Zn2+
Explanation:
Because oxidation number of Li changes from 0 to 2+ it means that Li has lost two electrons and oxidation number of Zn2+ changes to Zn which means Zn received two electrons.
During laparoscopic surgery , carbon dioxide gas is used to expand the abdomen to help create a larger working space. If 4.80 L of CO 2 gas at 18 °C at 785 mmHg is used, what is the final volume , in liters, of the gas at 37 degrees * C and a pressure of 745 mmHg if the amount of CO 2 does not change ?
Answer:
5.37 L
Explanation:
To solve this problem we need to use the PV=nRT equation.
First we calculate the amount of CO₂, using the initial given conditions for P, V and T:
P = 785 mmHg ⇒ 785/760 = 1.03 atmV = 4.80 LT = 18 °C ⇒ 18 + 273.16 = 291.16 K1.03 atm * 4.80 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 291.16 K
We solve for n:
n = 0.207 molThen we use that value of n for another PV=nRT equation, where T=37 °C (310.16K) and P = 745 mmHg (0.98 atm).
0.98 atm * V = 0.207 mol * 0.082 atm·L·mol⁻¹·K⁻¹ * 310.16 KAnd we solve for V:
V = 5.37 L6. Think of some other chemical reactions. List them and the type of reaction: exothermic or endothermic. Example: Burning coal - exothermic
Remember: energy is conserved in a chemical reaction (visualize the reaction and question whether heat lies on reactant side (left) or product side (right))
-exothermic- heat is released (heat is on the product side)
>forming an ionic lattice (SALT)- mixture of Na and Cl results in a more stable ionic lattice, causing this reaction to be exothermic
>burning wood
-endothermic- heat is absorbed (heat is on the reactant side)
> cooking an egg
describe the effect of subjecting hydrogen to pressure
Answer:
When hydrogen is subjected to large enough pressure, it solidifies according to theory.
Explanation:
According to theory, when hydrogen molecules are subjected to enormous degree of pressure the molecules will solidify.
What happens here is that the hydrogen–hydrogen bonds in the hydrogen molecule will break apart and the molecules collapses into hydrogen atoms.
Hence, when hydrogen is subjected to large enough pressure, it solidifies according to theory.
calculate the packing efficiency of simple cubic unit cell.
Answer:
52.4%
Explanation:
Since a simple cubic unit cell contains only 1 atom. The packing efficiency of the simple cubic cell is 52.4 %
What is the volume of a sample that has a mass of 20 grams and density of 4 g/mL?
Answer:
5 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{20}{4} \\ [/tex]
We have the final answer as
5 mLHope this helps you
Show Work
1. If you were to combine hydrogen with 80.0 g of oxygen, how much hydrogen would
you need to completely react with all of the oxygen?
2. Suppose sodium and chlorine form a compound in the ratio of 1.54 g chlorine to
1.0 g sodium. How much sodium would be needed to completely react with 45.0
of chlorine?
Answer:
Mass of hydrogen needed = 10 g
29.22 gram of sodium are required
Explanation:
1 )Given data:
Mass of oxygen = 80.0 g
Mass of hydrogen needed = ?
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 80 g/ 32 g/mol
Number of moles = 2.5 mol
now we will compare the moles of oxygen and hydrogen.
O₂ : H₂
1 : 2
2.5 : 2× 2.5 = 5 mol
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 5 mol × 2 g/mol
Mass = 10 g
2 : Given data:
initial mass ration of chlorine and sodium react with each other = 1.54 g : 1.0 g
Mass of sodium required for 45 g of chlorine = ?
Solution:
Cl₂ : Na
1.54 : 1.0
45 : 1.0/1.54× 45 = 29.22 g
Thus, 29.22 gram of sodium are required.
Which of the following substances is classified as a solution?
Salt water
Water
Hydrogen
Noble Gas
Answer:
Salt water
Explanation:
Please mark me brainliest and thank me.
Answer:
the answer slat water
Explanation:
Which properties are examples of chemical properties? Check all that apply.
reactivity
color
hardness
boiling point
combustibility
shape
Answer:
1.Reactivity
2.combustibility
3.Shape
Hope this helps,
If you think I am right please give brainliest
Happy Holidays!
Explanation:
