A light-year is the distance a beam of light travels in a single Earth year. so it is A distance
Give me brainliest
Can I get a rebuttal on why humans are better to send to space than humans.
Answer:
both are humans
Explanation:
so what on earth are you talking about?
Answer:
Do you mean why animals are better to send to space than humans? Animals do not comprehend what is going on so they are not worried or scared to die in space. They also do not have the same level of IQ as humans so humans are worth more if you saw it from that point of view. I know this can be debated however.
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Ok I see you posted a comment saying "Robots"
Robots will not die if there is an explosion because AI does not have a mind of it's own.
A given volume of methane diffuses in 20 seconds. How long will it take the same volume of hydrogen to diffuse under the same conditions? [CH4 = 16; H2 = 2]
The time taken for the same volume of methane gas to diffuse is 7.1 s.
Rate of gas diffusionThe rate at which a given mass of diffuses is inversely proportional to the molar mass of the gas.
[tex]\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }[/tex]
where;
M1 is the molar mass of methane (CH4) = 16 gM2 is the molar mass of hydrogen as = 2t1 is time taken for methane = 20 st2 is the time taken for hydrogen = ?[tex]\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }\\\\\frac{t_2}{20} = \sqrt{\frac{2}{16} }\\\\\frac{t_2}{20} = \frac{\sqrt{2} }{4} \\\\t_2 = \frac{20\sqrt{2} }{4} \\\\t_2 = 5\sqrt{2} \\\\t_2 = 7.1 \ s[/tex]
Thus, the time taken for the same volume of methane gas to diffuse is 7.1 s.
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The time it takes for hydrogen to diffuse is 7.07 seconds
Graham's law of diffusionTo calculate the time it will take hydrogen gas to diffuse, we use the formula from Graham's law of diffusion.
Formula:
T'/T = √(M'/M)........... Equation 1Where:
T' = Time taken for menthane to diffuseT = Time take for hydrogen to diffuseM' = Relative molecular mass of menthaneM = Relative molecular mass of hydrogen.Make T the subject of the equation
T = T'/[√(M'/M)]................ Equation 2From the question,
Given:
T' = 20 secondsM' = 16M = 2Substitute these values into equation 2
T = 20/[√(16/2)]T = 20/[√(8)]T = 20/(2.828)T = 7.07 secondsHence, The time it takes for hydrogen to diffuse is 7.07 seconds.
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why do scientists classify the brown algae and paramecium are both protists
what happens to a pendulum’s kinetic energy as the pendulum comes to a stop.
On the other end of the swing, the kinetic energy begins to change back into potential energy. The pendulum then comes to a complete stop! At the end of each swing, it comes to a complete stop for a brief moment. When the energy is "at rest," it is once again potential energy.
what is the volume of 5 moles of oxygen gas at r.t.p
4. Which of the following compounds is
molecular?
A. NaF
B. Al3PO4
C. CO2
D. KC1
Answer:
CO2(C)
Explanation:
This is because there is a mutual sharing of electrons between the atoms or elements...That's to say covalent bond exist between them.
Which of the following is a biotic part of an environment?
mud
clams
sunshine
rocks
Answer:
sunshine
Explanation:
because it's light u get it from the ecosystem
Answer:
sunshine is your correct answer
Abiotic factors are non-living things that "live" in an ecosystem that affect both the ecosystem and its surroundings. Some examples of Abiotic factors are the sun, rocks, water, and sand. Biotic factors are living organisms that affect other living organisms.
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GIVING BRAINLY
a balloon contains 2.5 L of air at 1.00 atm. it is taken underwater to a new pressure of 4.00 atm. what id the new volume? round to 2 decimal places
What is the Mr of a substance where 1 mole has a mass of 11 g?
Answer:
A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly
12 grams of carbon-12 (i.e., 6.023 X 1023).
Explanation:
The combustion of c2h4(g) is represented by the equation above. (a) use the enthalpies of formation in the table below to calculate the value of δh∘1 for the reaction
Based on Hess law of constant heat summation, the enthalpy of the combustion of C2H4 can be calculated from the heat of formation values of the products CO2 and H2O.
What is a combustion reaction?A combustion reaction is a reaction between a substance and oxygen in which light and large amounts of heat is given off.
The amount of heat evolved when one mole of that substance reacts completely with oxygen is known as the enthalpy of combustion of that substance.
The equation of the combustion of C2H4 is given below:
C2H4 + 3 O2 ---> 2 CO2 + 2H2OThe enthalpy of the combustion of C2H4 can be calculated from the heat of formation of the products CO2 and H2O based on Hess law.
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what is polyatomic?..
Answer:
The term poly implies many, so a polyatomic particle is a particle that contains more than one atom. Hence it is not the same as monatomic particles, which contain just a single iota. Instances of monatomic particles incorporate Na+ and Cl-
Answer:
The ions which contain more than one atoms behaving as a single unit are called polyatomic ions. For example, PO43−,CO32−
Explanation:
The purpose of a titration, such as
that done in the hard water lab, is to
Answer:
to detect equivalence point.
Explanation:
the point at which chemically equivalent amounts of reactants have been mixed.
What is the correct practice for minimizing exposure during a hazardous chemical spill?.
[tex]Important[/tex] [tex]Procedures[/tex]
▬▬▬▬▬▬▬▬▬
Wear these items...
GlovesGogglesLab coat∴ Hope this helps! Please give thanks. ∴
To prevent inhaling spill vapors. Avoid attempting to clean up a spill if it is in an area that isn't well-ventilated. Send out a call for help to respond to and clean up the spill.
Additionally, more severe side effects include breathing problems, coughing, wheezing, a faint feeling, or weakness that may result from significant chemical exposure. The most dangerous substances can cause immediate collapse, convulsions, and possibly even death.
Wearing personal protection equipment (often known as "PPE") helps reduce exposure to a number of risks. Gloves, foot, and eye protection, protected hearing equipment (earplugs, muffs), hard helmets, respirators, and complete body suits are a few examples of PPE.
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In an aqueous solution which substance yields hydrogen ions as the only positive ion *
Answer:
CH3COOH
Explanation:
Find the liters of 1.112 moles of CO
Answer:
24.9
Explanation:
Answer:
should be 22.4L
Explanation:
Explain what is respiration in your own words..
Answer:
Plants using glucose to make ATP molecules during the process of photosynthesis which results in the plant releasing oxygen.
This is cellular respiration. ↑
what are of study in chemistry is concerned with the heat changes that occur during chemical reactions?
Answer:
Thermochemistry
Explanation:
Thermochemistry is the area of study in chemistry that is concerned with the heat transfers that occur during chemical reactions.
Hope this helps.
HCl + CaCO3 → CaCl2 + H2O + CO2 balanced equation
Pls Help i will give 100 Points!!!
[tex]\\ \rm\rightarrowtail 2HCl+CaCO_3\longrightarrow CaCl_2+H_2O+CO_2[/tex]
On both sides
H=2O=3Ca=1C=1Hence balanced
How many moles are in 2.3 g of NaHCO3? Answer should have 3 digits after the decimal and a unit.
Answer: 0.027 moles
Explanation:
Help!!!
An unknown salt was dissolved to make a total 1.53g of solution. The temperature of the water decreased from
24.3C to 20.3C when 8mol were dissolved. What is the heat of solution in J/mol?
Answer:
3.213J/mol
Explanation:
first specific heat capacity of water = 4200J/Kg K
Q=mass×temperature difference×specific heat capacity
Q=1.53×(24.3-20)×4200
Q=25.704 J
heat of solution= quantity of heat ÷ amount of substance
heat of solution= 25.704÷8
heat of solution= 3.213J/mol
4. Use the chemical equation to answer the question.
4K(s) + O2(g) → 2K2O(s)
The molar mass of potassium (K) is 39 g/mol. The molar mass of oxygen (O) is 16 g/mol. How many grams of potassium are needed in the reaction to produce 23.5 grams of potassium oxide (K2O)?
A 23.5 g
B 9.75 g
C 0.50 g
D 19.5 g
The amount, in grams, of potassium that would be needed to produce 23.5 grams of potassium oxide will be 19.5 grams
Stoichiometric calculationFrom the equation, the mole ratio of K to K2O is 2:1.
Mole of 23.5 K2O = mass/molar mass
Molar mass of K2O = 39x2 + 16 = 94
Mole of 23.5 K2O = 23.5/94 = 0.25 moles
Equivalent mole of K = 0.25 x 2 = 0.5 moles
Mass of 0.5 mole K = 0.5 x 39 = 19.5 grams
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Answer: Calculating mass quick check
1. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.
2. Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.
3. 2(108 g/mol)+32 g/mol=248 g/mol; (248 g/mol)(0.02 mol)=4.96 g
4. 19.5 g
5. 853.5 g
You're welcome
If fluorine is stronger than carbon, what charge will the fluorine receive?
a. partially negative
b. partially positive
c. positive
d. negative
explain why
If fluorine is stronger than carbon, fluorine will receive a negative charge.
WHAT IS THE ELECTRONEGATIVITY SERIES?The electronegativity series is the order in which elements of the periodic table are ranked in terms of their negative charges.
Elements with higher electron affinity are positioned higher in the series. According to this question, fluorine is stronger than carbon.
This means that fluorine will receive a negative charge (-) to become more electronegative.
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7. What assumption of the kinetic-molecular theory explains why a gas can expand to fill a container?
Answer:
Gas molecules move at random with no attractive forces between them.
Explanation:
Kinetic-molecular theory is based on the following postulates, or assumptions.
Gases are composed of a large number of particles that behave like hard, spherical objects in a state of constant, random motion.
These particles move in a straight line until they collide with another particle or the walls of the container.
These particles are much smaller than the distance between particles. Most of the volume of a gas is therefore empty space.
There is no force of attraction between gas particles or between the particles and the walls of the container.
Collisions between gas particles or collisions with the walls of the container are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the container.
The average kinetic energy of a collection of gas particles depends on the temperature of the gas and nothing else.
Write a few sentences about respiration in your own words please just explain what is respiration and don’t answer for points because I will report you!!! For the longest while I’m trying to get a answer to this question
Answer:
The inhaling of oxygen and the exhaling of carbon dioxide. The process by which cells use oxygen to break down sugar and obtain energy is called respiration.
Which statement accurately describes differences between RNA and DNA?
Group of answer choices
RNA contains the nitrogenous base thymine, while DNA contains the nitrogenous base uracil.
RNA always folds into a single helix while DNA always folds into a double helix.
RNA contains pyrimidine bases, while DNA contains purine bases.
The nucleotides in DNA contain one phosphate group while those in RNA contain two phosphate groups.
The sugar in DNA contains one less hydroxyl group than the sugar in RNA.
Answer:
RNA always folds into a single helix while DNA always folds into a double helix.
I hope this helps you
:)
What volume of concentrated 18M solution is required to prepare 550 mL of a 2. 0M solution?
Explanation:
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Which of the following will dissolve in water?
Help quickly please picture is attached
option b mg2 magnesium dissove in water
Please help
Science....
Thanks
Answer:
docx it is a science document
The following acid-base reaction occurs spontaneously in the gas phase: NH₃(g) + HCl(g) ⇌ NH₄Cl(s) During an experiment, 10. 00 g of solid NH₄Cl was added to a 500. 0 mL flask at 25. 0°C. The equilibrium constant for this reaction at this temperature is 8. 9 × 10¹⁵, determine the partial pressures (in atm) of NH₃ and HCl after the reaction reaches equilibrium
The partial pressures (in atm) of NH₃ and HCl after the reaction reaches equilibrium is mathematically given as
PH3=1.06*10^{-8}atmPHCl=1.06*10^{-8}atmWhat is the partial pressures (in atm) of NH₃ and HCl after the reaction reaches equilibrium?Question Parameter(s):
Generally, the equation for the Chemical Reaction is mathematically given as
HCl(g) ⇌ NH₄Cl(s)
Therefore
[tex]Keq=\frac{1}{PH3*PHC}[/tex]
PH3*PHCl=1.23*10^16
Therefore
P^2=1.23*10^{-16}
P=1.06*10^{-8}
In conclusion,
PH3=1.06*10^{-8}atm
PHCl=1.06*10^{-8}atm
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How many moles are in 182 grams of BC13?
Answer:
?
Explanation: