Answer:
1/2hour
Explanation:
it takes the runner 1 hour to complete 10km
so 5km is half of 10km therefore would take half the time
hope that helps:)
Which statement is NOT true about the human sperm cell?
composed of a "head" and "tail"
one of the smallest cells in the male body
the flagella(tail) is used for motility
all of the above are true
Answer:
all of the above
Explanation:
PLEASE HELP AS SOON AS POSSIBLE
Compare how entropy changes for the following two systems:
System A: A gas and a solid react to form a new solid product.
System B: Rubbing alcohol evaporates on the skin
In system A: A gas and a solid react to form a new solid product. The system entropy decreases.
In System B: Rubbing alcohol evaporates on the skin. Liquid alcohol is converted to gas by evaporation. So the system entropy increases.
What is Entropy?Entropy is a thermodynamic quantity measure the degree of disorder of a certain system.
Gases have larger entropy compared to liquids and which is larger than solids.
System A: When a gas convert to a solid, its entropy decreases because solids have less energy and entropy than solids.So, in system A: A gas and a solid react to form a new solid product. The system entropy decreases.System B: Any chemical reaction that increases the number of gas molecules also increases entropy.So, in System B: Rubbing alcohol evaporates on the skin. Liquid alcohol is converted to gas by evaporation. So the system entropy increases.Learn more about entropy here:
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Answer:
System A: The entropy decreases due to the solid having fewer moving particles than the gas .
System B: There is an increase in entropy. The change in the state of a liquid to a gas is an increase in entropy (disorder) because the particles of a gas are moving faster and forming more random arrangements than they are in the more condensed liquid state.
Explanation:
What is the relationship between a solution and a mixture.
Answer: In a mixture, substances are generally just mixed and are not completely dissolved. In a solution, substances are dissolved completely and they cannot be filtered out.
Explanation:
I need help asap!!!!!!!!
Answer:
A
Explanation:
add 22 with the answers like A, 33+22=55
composed of an organic matrix, which gives it tensile strength; it is composed an inorganic calcified matrix, which gives it hardness. __________ is a condition, whereby a certain amount of bone density is loss; it then involves loss of both matrices.
Bone is composed calcified matrix, which gives it hardness. The loss of this bone hardness is called Osteopenia.
Loss of bone strengthBone is an organic matrix that is highy reinforced by inorgaanic minerals such as calcium. Bone is known to be intricated laced in a calcified matrix, which gives it hardness.
The loss of this bone density and consequent loss of the rigidity of the bone is called Osteopenia.
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What is the minimum internal cooking temperature for ground beef?.
Particles
How many moles of water are
in 1.23x1018 water molecules?
[ ? ]x10[?]
Enter your answer with the correct
number of significant figures and be sure
the prefix is a number between 1 and 10!
а
Prefix (green)
Exponent (yellow)
Answer:
Explanation:
The moles have been the mass of the molecule that has been present with respect to the molecular mass of the compound. The number of molecules that have been present in a mole of the compound has been equivalent to the Avogadro number.
The Avogadro number has been constant with a value of 6.023 .
Thus, the number of molecules in a mole of the compound has been given by:
1 mole = 6.023 molecules
The given molecules of water have been . The moles of the water molecule has been given by:
6.023 molecules = 1 mole of water
molecules =
The moles of water have been = 2.04
Thus, the mole of water that has been consisting of molecules has been 2.04 mol.
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Complete the following solubility constant expression for SrCO3•
Refer to image for problem.
Thank you so much whoever can help <3 I appreciate quick responses
Answer:
[Sr2+][CO32-]
Explanation:
When this compound dissolves in water, it breaks up into Sr cations and CO3 anions. Due to the fact that the element Sr lies in group 2, and is a cation, we know that it can be represented by the expression - [Sr2+]. From this we can come up with the following expression for CO3 - [CO32-].
How many molecules are there in 2.3 grams NH3
Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:
2.30 g NH3 (1 mol / 17.03 g ) (6.022 x 10^23 molecules / 1 mol ) = 8.13x10^22 molecules
Help me please and thank you
Answer:
a
Explanation:
one is Na other is Cl
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: ()bao2 ()h2so4 → ()h2o2 ()baso4
Based on the chemical equation, the value of coefficient that is used in the reaction is 1.
What is balanced equation?Balanced chemical equations are those equation in which each entities are present in same amount on left side as well as on the right side of the chemical reaction.
Given chemical reaction is:
BaO₂ + H₂SO₄ → H₂O₂ + BaSO₄
Above reaction is balanced as all elements are present in same amount on both sides. So, the value of coefficients is 1.
Hence the required coefficients is 1.
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Some greenhouse gases, such as fluorocarbons (CFCs, HFCs, PFCs, etc. ), are human-made. Others, such as water, methane, and carbon dioxide, are naturally produced. Which type of greenhouse gas (human-made or natural) is more difficult to control and eliminate? Which types are easier? In three to five sentences, provide evidence for your argument
The green house gases are those gases that are known to prevent the escape of infrared rays.
What are green house gases?The green house gases are those gases that are known to prevent the escape of infrared rays and ultimately lead to an increase in the temperature of the earth.
These green house gases could be natural or artificial. The natural greenhouses gases are more difficult to control because they can alaso be produced in natural processess that are not subject to human control.
For instance, there are process in the ocean that produce methane and this gas is also produced by decomposition in nature. This makes the control of the gas not entirely within the control of man.
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A reaction that involves the transfer of electrons from one molecule to another is referred to as an oxidation reaction. a redox reaction. a reduction reaction.
Answer:
Terms in this set (31) A reaction that involves the transfer of electrons from one molecule to another is referred to as. a redox reaction. During an oxidation reaction, the donor molecule loses an electron and becomes oxidized.
Explanation:
hope this helps<33
A student in your lab volunteers to enter a hypoxic breathing chamber for 10 minutes, and his alveolar PO2 drops to 50 mm Hg. What other change would occur
The central region of an atom where its neutrons and protons are is its:.
Arrange the following measurements in order from least to greatest.
5 micrograms
5 milligrams
5 kilograms
5 grams
<
<
<
5 micrograms then 5 milligrams than 5 g then 5 kg
how many protons, neutrons and electrons? please help
PLEASE HELP!!!!!!!!!!!!!!!!!!!
Based on temperature changes, the phase changes that occur in water is from a solid at A to a liquid at B, and from liquid a B to gas at C.
What is change of state?Change of state is the process whereby a substance changes its state of matter from one form to another as as result of heat changes.
In the graph shown above, water exists in three states at different points.
Water exists as a solid at A Water exists as a liquid at BWater exists as a gas at C.Therefore, the phase changes that occur in water is from a solid at A to a liquid at B, and from liquid a B to gas at C.
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Lars is balancing equations with his study group. he is unsure about one equation because each member of the study group came up with a different answer. which is the proper way to balance the equation ca(oh)2 h3po4 → ca3(po4)2 h2o? ca(oh)2 h3po4 → ca3(po4)2 6h2o 3ca(oh)2 2h3po4 → ca3(po4)2 6h2o 3ca(oh)2 2h3po4 → ca3(po4)2 3h2o ca(oh)2 2h3po4 → ca3(po4)2 6h2o
The proper way to balancing the given equation is 3Ca(OH)₂+2H₃PO₄→Ca₃(PO₄)₂ +6H₂O
What is balanced equation?Balanced equations are those reactions in which each atom of reactants and products are present in same quantity on both sides of the equation.
Given chemical reaction is:
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O
Let we discuss each given reaction to get the perfectly balanced equation:
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + 6H₂OIn the above reaction number of hydrogens, calcium as well as of oxygens are not equal so that it is an unbalanced equation.
3Ca(OH)₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 6H₂OIn the above equation all atoms are present in equal amount on both sides of the reaction, so that it is a balanced equation.
3Ca(OH)₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 3H₂OIn the above reaction number of oxygen and hydrogen atoms are not equal so that the given equation is an unbalanced one.
Ca(OH)₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 6H₂OIn the above freaction all atoms are unequal so that given equation is an unbalanced equation.
Hence balanced equation is 3Ca(OH)₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 6H₂O.
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What happens during reduction?
Loss of electrons
Gain of electrons
Loss of protons
Gain of protons
Magnesium loses electrons and loss of electrons is oxidation. Copper (II) ions gain electrons and gain of electrons is reduction. Redox is when oxidation and reduction occur simultaneously in the same reaction.
Answer:
Gains of electrons
An automobile battery that uses 2520W of power is connected to an electric
starter motor. How many joules of energy does the battery deliver to the motor
each second?
Answer:
Explanation: current= watts divided by voltage= 75/120= 0.625 amperes.Jan 14, 2017
balance fe+4h2o=fe2o3+h2
Answer:
2Fe+3H20=Fe203+3H2
Explanation:
Describe how Fire Making undergo heat to light energy transformation.
As the combustible materials burn, some of the chemical energy is transformed into heat energy, and some are transformed into light energy. Light energy, also known as radiation or electromagnetic energy, is a type of kinetic energy that takes the form of visible light waves, such as the light from a match.
How many moles of calcium acetate are needed to react with 5.00 moles of sodium carbonate?
Answer:
[tex]5.00 moles Ca(C_2H_3O_2)[/tex]
Explanation:
First find the chemical formula for this reaction:
[tex]Ca(C_2H_3O_2) + Na_2CO_3 - > CaCO_3 + 2NaC_2H_3O_2[/tex]
Knowing from the chemical formula that one mole of calium acetate will react with one mole of sodium carbonate can be used to find how many moles of calcium acetate react with 5.00 moles of sodium carbonate:
[tex]5.00 molNa_2CO_3 * \frac{1 molCa(C_2H_3O_2)}{1 mol Na_2CO_3} = 5.00 mol Ca(C_2H_3O_2)[/tex]
Remember that your answer needs to have three significant figures.
What would the concentration of an NaOH solution be if 25 moles were used and 50 L were used?
0.5 M
0.5 M
2 M
, 2 M
1250 M
1250 M
25 M
Answer: 0.5 M
Explanation:
How do gravitational forces impact the motion of earth and moon?
Answer:
The Gravitational Force of the Earth and Moon on Each Other. According to Newton's Third Law of Motion, the Law of Action and Reaction, if the Earth exerts a force on the Moon, the Moon must exert an equal and opposite force on the Earth.
What is TVEL (nuclear fuel cycle) special features that use Nuclear Technology?
Answer:
TVEL is developing mixed-oxide (MOX) fuel and REMIX fuel, with both using recycled uranium together with plutonium. This is the dual-component approach. "We're very actively engaged in this and right now it is cost-intensive,"
Answer:
Brainliest pls
Explanation:
The nuclear fuel cycle consists of several steps: mining, milling, conversion, enrichment, fuel fabrication, and electricity generation.
Conclusion: Write a conclusion statement that addresses the following questions: How did your experimental absolute zero value compare to the accepted value? Does your data support or fail to support your hypothesis (include examples)? Discuss any possible sources of error that could have impacted the results of this lab. How do you think the investigation can be explored further? Post-Lab Reflection Questions Answer the reflection questions using what you have learned from the lesson and your experimental data. It will be helpful to refer to your chemistry journal notes. Answer questions in complete sentences. Why was the line of best fit method used to determine the experimental value of absolute zero? Which gas law is this experiment investigating? How does your graph represent the gas law under investigation? Using your knowledge of the kinetic molecular theory of gases, describe the relationship between volume and temperature of an ideal gas. Explain how this is reflected in your lab data. Pressure and number of moles remained constant during this experiment. If you wanted to test one of these variables in a future experiment, how would you use your knowledge of gas laws to set up the investigation?
Answer:
Brainliest pls
Explanation:
Although the information for the trial was not given, we can offer a summed-up reply in that while playing out an analysis to accomplish outright zero temperatures, the worth won't ever match the specific worth.
What is absolute zero?
Absolute zero is the lower furthest reaches of temperature. Considered the coldest conceivable temperature that can exist. Nonetheless, any endeavor to arrive at this temperature in a controlled climate has fizzled, researchers don't think reproducing this temperature is conceivable.
In this way, we can affirm that the worth of indisputably the zero tests didn't match the acknowledged worth. Assuming the speculation was that it would be troublesome or difficult to accomplish, then the information would uphold the theory, if not, it would neglect to do as such.
In outline, outright zero is a temperature that can't be reproduced in a lab, so the worth in this analysis doesn't match the acknowledged worth and there could be no further investigation to be done on this.
which of the following charecteristics will not help u tell whether two solids are the same or are diferent substances?
Answer:
D. Melting point
Explanation:
A. Color
B. Hardness
C. Shape
D. Melting point
If a ratio of two elements in a chemical formula is 1:1, does this necessarily mean that the number of atoms of each element is 1 ? Explain your answer
Answer:
i do not know sorry i such at this hope you find the answer.
ratio = 1 : 1
the number of atoms can be 1: 1, 2:2, 3:3 etc