Answer:
Dehydration is a drag on human performance. It can cause fatigue and sap endurance among athletes, according to a 2018 study in the journal Frontiers in Physiology. Even mild dehydration can interfere with a person's mood or ability to concentrate
Explanation:
Dehydration is a drag on human performance. It can cause fatigue and sap endurance among athletes, according to a 2018 study in the journal Frontiers in Physiology. Even mild dehydration can interfere with a person's mood or ability to concentrate
A gas syringe contains 42.3 milliliters of a gas at 371 K. Determine the volume that the gas will occupy if the temperature is decreased to 254 K.
Answer:
28.82 mL
Explanation:
This is about gases laws, in this case about Charles Gay Lussac.
At constant pressure the volume is proportional to the T°.
V₁ / T₁ = V₂ /T₂
42.1 mL / 371K = V₂ /254K
(42.1 mL / 371K) . 254K
V₂ = 28.82 mL
In conclussion:
As T° was decreased, the volume also decreased too.
The overnight temperature in Polokwane drops from 11° C to -2° C. By how many degrees has the temperature dropped?
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1.00mol is the correct answer
Lithium, sodium and potassium are all in group 1 of the periodic table. Which of these has the lowest boiling point?
Answer:
Potassium
Explanation:
In group one of the periodic table both the melting and the boiling points usually decrease down the group.
Now, down the group, it's lithium that comes first, then sodium, then potassium.
Thus, among the 3, potassium is furthermost down the group by virtue of the factor it has the highest atomic number.
Therefore, we can say that potassium has the lowest boiling point among the 3.
If 1.85 g of Mg(OH)2 reacts with 3.71 g of HCl,
how much MgCl2 is produced? What is the limiting
reactant?
If 5.26 L of nitrogen monoxide and 7.64 L of oxygen
are combined, what mass of nitrogen dioxide is
formed? Assume conditions are STP.
If 18.1 g of silicon tetrachloride reacts with 8.4 L of
hydrogen at STP, what mass of silicon is formed?
What mass of Cu(OH)2 is produced in the reaction of
7.6 g Cu(NO3)2 with 6.2 g of KOH?
What mass of carbon dioxide is formed when 64 kg
of ethylene is burned in 142 kg of oxygen?
please show work any answered question is helpful
heeeeeeeeeeeeeeeeeeeeeelp
Answer:
The correct answer is 2.33g of [tex]H_{2}O[/tex], A
Explanation:
We can use basic stoich to get this question.
To start, lets convert our grams to moles in order to use our equation. 5.38g of [tex]O_{2} = (\frac{5.38}{2*15.999}) moles = 0.168136[/tex] moles.
We then can use our molar ratio of 13:10. Simply divide by our molar ratio in order to go from moles of [tex]O_{2}[/tex] to moles of [tex]H_{2}O[/tex]. This gets us 0.129335 moles of [tex]H_{2}O[/tex].
Now lets convert to grams of [tex]H_{2}O[/tex] by multiplying by the molar mass of [tex]H_{2}O[/tex]. [tex].129335*(1.008*2+15.999) = 2.32997g[/tex] of [tex]H_{2}O[/tex]
Question 6 (1 point)
This is the day of the year with the least amount of daylight, which is due to the Earth tilting away from the sun.
Question 6 options:
equinox
summer solstice
winter solstice
revolution
Question 7 (1 point)
What is the difference between rotation and revolution?
Question 7 options:
Rotation is when an object travels in a path around another.
Rotation is when an object spins arounds its axis
Revolution is when an object spins arounds its axis
Revolution is when an object travels in a path around another.
Question 8 (1 point)
Why do you only see one side of the moon?
Question 8 options:
The moon only has one side
The rotational period is equal to the period of revolution for the moon.
The moon is made of green cheese
The moon is always full
Question 10 (1 point)
The moon does not light up by itself. Instead, it reflects light from the sun.
Question 10 options:
True
False
Answer:
question 6: winter solstice
question 7: rotation is when an object spins around its axis, revolution is when an object travels in a path around another
question 8: the rotational period is equal to the period of revolution for the moon
question 10: true
Answer:
Question 6: winter solstice
Question 7: rotation is when an object spins around its axis,
revolution is when an object travels in a path around another
Question 8: the rotational period is equal to the period of revolution for the moon
Question 10: true
Explanation:
I took the test its right
Please help! This is for a test and I want to have a good grade. Have a great day! :)
Answer:
genetic engineering !! :)
Explanation:
also, i love the pfp <3
Why is copper a good electrcity conducter
Explanation:
HOPE IT WILL HELP YOU TO SOLVE YOUR PROBLEM.Answer:
Each copper atom has lost one electron and become a positive ion. ... The electrons can move freely through the metal. For this reason, they are known as free electrons. They are also known as conduction electrons, because they help copper to be a good conductor of heat and electricity.
What would be the volume, in liters, of 85.5 grams of carbon monoxide at STP?
1. What does each unit on the y-axis
represent?
A. the number of individuals in a sea otter population
B. the breeding season
C. total area in which a population lives
D. mortality rates
Answer:
The answer is A) the number of individuals in a sea otter population
All of the following increases down the group except one
A metallic character
B atomic size
C electropositivity
D ionization energy
Answer:
B: Atomic size
Explanation:
I just guess for the points
which of the following methods of making electricity results in dangerous radioactive waste
A. Solar energy
B. Nuclear energy
C. Geothermal energy
D. Wind energy
Answer:
B. Nuclear energy
Explanation:
After studying many factors in the environment, a scientist developed this graph to
predict changes in human population and natural resources.
What is a role of science in this study?
Choose the correct answer.
A to develop government policies to reduce the use of resources
B to set costs for natural resources according to their availability
C to determine the steps necessary for society to preserve natural resources
D to predict the effects of human population on the supply of natural resources
Answer:
D. to predict the effects of human population on the supply of natural resources
Explanation:
From the available graph, it can be seen that Natural resources and human population are directly proportional to each other. As the human population increases, the natural resources decreases, until they both finally meet up.
Hence, in this case, the correct answer is that the role of science in this study is "to predict the effects of human population on the supply of natural resources."
What property of water accounts for its ability to insulate areas around it?
Answer:
Floating ice can insulate bodies of water. Answer: b. Discuss how a high specific heat helps to buffer temperature for organisms. Water's high specific heat is important to life because...
Explanation:
The orbits of the planets in our solar system are
not
a Elliptical, circular
b Circular, elliptical
C Circular, oval
d None of the above
Answer:
A
Explanation:
I don't know how to say how I got it.
Answer:
d
Explanation:
the orbits of the planets in our circular elliptical and circular
A gas tank contains 2.5 moles of oxygen, 7.0 moles of nitrogen and 0.5 mole of water vapor. The total pressure of the mixture is 852 torr. Calculate the partial pressure of each gas. Show work.
Answer:
The partial pressure of each gas is:
Oxygen= 213 torrNitrogen= 596.4 torrWater Vapor= 42.6 torrExplanation:
The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
PT = PA + PB
This relationship is due to the assumption that there are no attractive forces between the gases.
Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture. The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present.
The mole fraction of a gas in a gas mixture is given by:
XA = nA / nT
This fraction will always be less than 1.
So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:
PA = XA * PT
In this case, you know:
number of moles of oxygen= 2.5 molesnumber of moles of nitrogen= 7.0 molesnumber of moles of water vapor= 0.5 molesSo, the number of total moles nT is calculated as:
nT= number of moles of oxygen + number of moles of nitrogen +number of moles of water vapor
Then:
nT= 2.5 moles + 7.0 moles + 0.5 moles
nT= 10
So, the mole fraction of the gas in the mixture is:
mole fraction of oxygen = [tex]\frac{2.5 moles}{10 moles}[/tex] = 0.25mole fraction of nitrogen = [tex]\frac{7 moles}{10 moles}[/tex] = 0.7mole fraction of water vapor = [tex]\frac{0.5 moles}{10 moles}[/tex] = 0.05Being the total presurre (PT) equal to 852 torr, then:
Poxygen= 0.25*852 torr= 213 torrPnitrogen= 0.7*852 torr= 596.4 torrPwater vapor= 0.05*852 torr= 42.6 torrThe partial pressure of each gas is:
Oxygen= 213 torrNitrogen= 596.4 torrWater Vapor= 42.6 torrSodium chloride is a ____ substance because the atoms within are arranged in repeating patterns.
work bank
- crystalline
- hydrogen bonds
- hydrophilic
- hydrophobic
- polar molecule
- solvent
Propane, C3H8, a fuel used in many outdoor grills, burns in oxygen to produce carbon dioxide gas, CO2, and water vapor, H2O, as shown in the reaction below. If 2.0 mol of propane are burned (reacted with oxygen), how many moles of carbon dioxide will be produced?
Answer:
6 moles of CO₂
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
C₃H₈ + 5O₂ —> 3CO₂ + 4H₂O
From the balanced equation above,
1 mole of C₃H₈ reacted to produce 3 moles CO₂.
Finally, we shall determine the number of mole of CO₂ produced by the reaction of 2 moles of C₃H₈. This can be obtained as follow:
From the balanced equation above,
1 mole of C₃H₈ reacted to produce 3 moles CO₂.
Therefore, 2 moles of C₃H₈ will react to produce = 2 × 3 = 6 moles of CO₂.
Thus, 6 moles of CO₂ were obtained from the reaction.
35.7 L of CL2 gas are used in an experiment. Determine the mass in grams of the chlorine gas
How does a graph show a runner at rest?
it goes from a high point to a low point back to a high point or vice versa.
what is the name of the part of a cell that allows molecules in in, such as glucose and oxygen?
Answer:
A plasma membrane is permeable to specific molecules that a cell needs. Transport proteins in the cell membrane allow for selective passage of specific molecules from the external environment. Each transport protein is specific to a certian molecule (indicated by matching colors).
3 – Simple Diffusion Across the Cell (Plasma) Membrane: The structure of the lipid bilayer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion.
Or Cell Membrane
Explanation:
Hope This HElp??
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HELP!!!!!!!! 15 points and BRAINLIEST
Answer:
1 HBr + 1 KOH -> 1 KBr + 1 H2O
Explanation:
Which of the following is a statement of Hess's law?
Answer:
D) The enthalpy of reaction does not depend on the steps taken in the reaction.
Explanation:
In my study guide, it says, "Hess's law states that the enthalpy of a reaction does not depend on the path."
hope this helps~
If parents wanted to pick their child's traits like hair color, gender, eye color, what would doctors have to do?
Answer:
Nothing
Explanation:
I would say this because the parents are picking the baby's traits and they make all the decisions. And i guess the doctor would have to follow the traits, if i'm right i tried
Can i get some help?
Answer:
Rabbit
Explanation:
I said rabbit because the snake feeds off the rabbit and that's where he gets his energy from. If the question asked you what is the primary source of energy in this food chain then the answer would be the sun. Since the question only asks you about the snake then the rabbit is the answer.
Hope this helps!
Your teacher takes a candle and cuts some wax from the bottom of it. She puts a bit of wax in a beaker and places it on a hot plate. Eventually, the wax melts and becomes a liquid. Do you think this a physical or a chemical change? Explain.
Answer:
It is a chemical change
Explanation:
Melting of wax is temporary and wax can settle again on cooling and turns into a solid. ... Hence it is a chemical change.
Answer:
physical
Explanation:
the wax is changing it's physical state by becoming a liquid, it isn't changing it's chemical makeup
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Answer:
3 i am pretty sure make me brainy i gust
Explanation:
2.00 L of a gas is collected at 25.0°C and 745.0 mmHg. What is the volume at 760.0 mmHg
and 273K?*
1.7960L
Explanation:
the mass of the gas is constant in both instances
pv/T=constant(according to pv=nRT)
745mmHg*2L/298K=760mmHg*v/273K
v=1.7960L