Answer:
B.
Our pupils contract and expand depending on the amount of light at any given time in order to avoid being blinded and to see better in the darkness.
which of the following affect the discharge of ions in electrolysis
Answer:
Discharge of ions during electrolysis is affected by, current apllied, the time of electrolysis, electrode type, posiiton of metal in electrochemical.
Explanation:
form a belt between Mars and Jupiter.
A)
Asteroids
B)
Comets
C)
Meteors
D)
Stars
Answer:
A
Explanation:
2 C.H. (g) + 190, (g) → 1200, (g) + 147,0 (8)
Answer:
please your question is not understandable
How much water would I need to add to 700 mL of a 2.7 M KCl solution to make a 1.0 M solution?
Answer:
[tex]1190\ \text{mL}[/tex]
Explanation:
[tex]M_1[/tex] = Initial Concentration of KCl = 2.7 M
[tex]V_1[/tex] = Volume of KCl = 1 M
[tex]M_2[/tex] = Final concentration of KCl = 1 M
[tex]V_2[/tex] = Amount of water
We have the relation
[tex]M_1V_1=M_2V_2\\\Rightarrow V_2=\dfrac{M_1V_1}{M_2}\\\Rightarrow V_2=\dfrac{2.7\times 700}{1}\\\Rightarrow V_2=1890\ \text{mL}[/tex]
The amount of water that is to be added is [tex]1890-700=1190\ \text{mL}[/tex].
Do not abuse or misuse any piece of drawing instrument. ASAPPPP
Given the following chemical reaction:
N2 + 202 --> 2 NO2
How many liters of N2 are needed to react with 10 liters of Q? Explain
Answer:
1
Explanation:
one volume of nitrogen to react
What important material is absorbed by your digestive system besides water
Answer:
The monosaccharides, amino acids, bile salts, vitamins, and other nutrients are absorbed by the cells of the intestinal lining
Explanation:
Answer:
The monosaccharides, amino acids, bile salts, vitamins, and other nutrients are absorbed by the cells of the intestinal lining.
Explanation:
A 5.0 L air sample at a temperature of -50°C has a pressure of 800.00 mmHg. What
the new pressure if the temperature is raised to 100°C and the volume expands to 7.0
L?
Answer:
956 mmHg
Explanation:
The combined gas law states that P1V1/T1 = P2V2/T2 when moles of gas are constant. We're looking for P2, so solve all of that for P2. Make sure you convert your temperatures to Kelvin by adding 273 to the Celsius temperatures.
P2 = P1V1T2/T1V2
P1 = 800.00 mmHg
V1 = 5.0 L
T2 = 100 + 273 = 373 K
T1 = -50 + 273 = 223 K
V2 = 7.0 L
P2 = (800.00 mmHg)(5.0 L)(373 K) / (223 K)(7.0 K) = 956 mmHg
Which of these actions increases enthalpy in the air molecules of the Earth's
atmosphere?
A. The air being heated by the sun
B. Trees being planted in the rain forests
C. Carbon dioxide being taken in by plants during photosynthesis
D. People breathing in oxygen
HELP PLS
Answer:
The air being heated by the sun
Explanation:
Just took the quiz
Answer:
The answer is A (the air being heated by the sun)
Explanation:
A P E X
What physical property of matter determines the earth ?
Answer:
Density is a physical property that is determined by dividing the mass of a given amount of a substance by its volume.
Explanation:
What is the scaling factor if the molar mass of
this compound, having an empirical formula of
ch2o, is 150 g/mol?
Answer:
The scaling factor is 5.
Explanation:
Hello there!
In this case, since the scaling factor is defined as the ratio of the molar mass of the molecular formula (complete) to the empirical formula (simplified), it is possible to compute it for the empirical formula of CH2O whose molar mass is 30 g/mol (12+2+16) as shown below:
[tex]sf=150/30=5[/tex]
Therefore, we can also infer that the molecular formula would be:
[tex]C_5H_1_0O_5[/tex]
Best regards!
What is another name for a mole?
O A. Rutherford's number
O B. Mendeleev's number
O C. Dalton's number
D. Avogadro's number
Answer: D Avogadro’s Number
Explanation:
Another name for a mole is Avogadro's number. option D) is correct.
What is a Mole?
A mole refers to the amount of a substance that contains as many elementary units as can be found in 12g of Carbon-12. It can also be a number of a substance /particles, such as atoms or ions. molecules or electrons. The number of particles is approximately 6.02* 10²³ in magnitude and is called Avogadro's number of particles. it can be denoted with 'mol'.
Formula for calculating mole.
n = N/Nₐ
Where,
n = number of moles of the substance (or elementary entity)
N = total number of elementary entities in the sample
Nₐ= Avogadro constant.
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Consider the system below at equilibrium at 200oC. 2Cl2 (g) + 2H2O (g) + heat ↔ 4HCl (g) + O2 (g) Which response contains all the stresses listed that will result in a shift of equilibrium so that more HCl is produced when equilibrium is re-established, and no stresses that will not? I. adding some Cl2 II. raising the temperature at constant pressure III. decreasing the volume at constant temperature
Answer:
The answers are in the explanation
Explanation:
Based on Le Châtelier's principle, when a system in equilibrium change a condition, the system will produce a reaction in order to subtract the effect of the initial change.
For the equilibrium:
2Cl2 (g) + 2H2O (g) + heat ↔ 4HCl (g) + O2 (g)
I. Adding some Cl₂. Will produce the equilibrium shifts to the right in order to decrease the concentration of Cl₂ and produce more HCl.
II. raising the temperature at constant pressure. As the system requires heat to produce the reaction, the system will shift to the right in order to decrease the heat and produce more HCl
III. decreasing the volume at constant temperature. As the volume decreases, the pressure increases. In the left, there are 4 moles of gas and in the right there are 5. When the pressure increases the system will try to decrease the moles of gas in order to decrease the pressure. THat means the system will shift to the left in order to produce more Cl₂
A sample of an unknown compound is vaporized at 130°C . The gas produced has a volume of 1280mL at a pressure of 1.00 atm and it weighs 4.03g
Assuming the gas behaves as an ideal gas under these conditions, calculate the molar mass of the compound. Round your answer to 3 significant digits.