Answer:
26.66kg
Explanation:
If a person has a mass of 80kg, then they will weigh 80kg x 9.8m/s^2 or 784 Newtons on the Earth. That same person would weigh 80kg x 9.8m/s^2/3 or 261.33 Newtons on Mars, which the person might think was 26.66 Kg (although he would be incorrect since his mass has not changed).
The basic unit of structure and function of living things is the .
nucleus
cell
tissue
membrane
Answer &
Explanation:
eukaryotic: Having complex cells in which the genetic material is contained within membrane-bound nuclei. cell: The basic unit of a living organism, consisting of a quantity of protoplasm surrounded by a cell membrane, which is able to synthesize proteins and replicate itself.
therefore it is cell
Which molecule is used up in photosynthesis?
O A. Oxygen
O B. Nitrogen
O C. Sugar
O D. Water
Answer:
d
Explanation:
water and carbon dioxide
Polar air masses bring warm temperature and have lower air temperature? T or F
Answer:
t? im pretty sure have a good day
Why were the results of the meta-analysis of 12 randomized controlled trials more significant than the results from the observational studies
of the Britons and Seventh-Day Adventists in North America?
Answer: Why were the results of the meta-study of 12 randomized reserved troubles more meaningful than the results from the practical studies of the Britons and Seventh-Day Adventists in North America? The meta-study is more meaningful cause matters were carelessly picked and pressure misfortune was calculated.
what r variable's :) :) :) :) :)
Answer: an element, feature, or factor that is liable to vary or change.
"there are too many variables involved to make any meaningful predictions"
Explanation:
Answer:
A variable is any characteristics, number, or quantity that can be measured or counted.
Explanation:
What must remain constant if Charles' law is to be applied to a
given sample of a gas?
a Pressure
b Volume
C Temperature
d None of the above
Answer:
pressure must remain constant
Explanation:
charles law= V/T
where pressure remains constant
If Charles' law is to be applied to a given sample of a gas, then it must have constant pressure.
What is gas law?Gas law are the hypothesis which tells about the behavior of gas at different conditions.
According to the Charles' Law, volume of the gas at any constant pressure and no. of moles of gas is directly proportional to the temperature of the gas at that condition. Charles' law is represented as:
V ∝ T, where
V = volume of gas
T = temperature of gas
Hence option (a) is correct i.e. pressure.
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Urea [(NH2)2CO] is a by-product of protein metabolism, and it can be synthesized in a lab by combining ammonia and carbon dioxide according to the following equation 2NH3(g) + CO2(g) (NH2)2CO(aq) + H2O(l) determine the moles of carbon dioxide required to reaction with 2.50 moles of ammonia.
1.25 moles of \(CO_{2}\) are required to react with 2.50 moles of \(NH_{3}\).
What are the moles?
Moles are a unit of measurement used in chemistry to express the amount of a substance. One mole of a substance is equal to its molecular weight expressed in grams. In other words, one mole of a substance contains 6.022 x \(10^{23}\) individual particles (atoms, molecules, or ions). The number of moles of a substance can be calculated by dividing its mass in grams by its molecular weight or by using the ideal gas law PV=nRT, where n is the number of moles.
The balanced chemical equation is:
\(2NH_{3}\)(g) + \(CO_{2}\)(g) → \((NH_{2})_{2}CO\)(aq) + \(H_{2}O\)(l)
From the balanced equation, we can see that 1 mole of \(CO_{2}\) reacts with 2 moles of \(NH_{3}\).
Therefore, to determine the moles of \(CO_{2}\) required to react with 2.50 moles of \(NH_{3}\), we need to use the mole ratio from the balanced equation:
2 \(NH_{3}\) : 1 \(CO_{2}\)
2.50 moles \(NH_{3}\) * (1 mole \(CO_{2}\) / 2 moles \(NH_{3}\)) = 1.25 moles \(CO_{2}\)
Therefore, 1.25 moles of \(CO_{2}\) are required to react with 2.50 moles of \(NH_{3}\).
What is molecular weight ?
Molecular weight, also known as molar mass, is the mass of one mole of a substance. It is expressed in units of grams per mole (g/mol). The molecular weight of a compound is determined by adding up the atomic weights of all the atoms in the molecule.
What is substance?
In chemistry, a substance is a form of matter that has constant chemical composition and characteristic properties. It may be an element or a compound made up of two or more elements chemically combined in a fixed proportion. Examples of substances include pure water, carbon dioxide gas, and sodium chloride (table salt).
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The number of electrons in 1.6 gram CH, is:
Answer:
6.022 x 10²³ electrons
Explanation:
The speed of sound varies according to the material through which it travels. Sound travels at 5.4 × 103 cm/s through rubber and at 1.97 × 104 ft/s through granite. Calculate each of these speeds in m/s.
Speed in rubber:
m/s Speed in granite: × 10 -- m/s
The speed of sound is the speed at which sound travels from one point to another.
What is the speed of sound?The speed of sound is the speed at which sound travels from one point to another. We know that the speed of sound varies from place to pace owing to the density ad the kind of particles that are found in the medium.
Thus, we are going to convert the following now to units of meter per second.
1) For 5.4 × 103 cm/s we have 5.4 × 10^3 cm/s /100 = 54 m/s
2) For 1.97 × 104 ft/s we have r 1.97 × 10^4 ft/s / 0.3048 = 6.46 m/s
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If [H3O^ + ]=1.7*10^ -8 M what is the pOH of the solution?
Answer: 6.23
Explanation:
1) solve for pH
pH=-log (H3O+) = - log 1.7 X 10^-8 =7.77
2) now do 14-pH = 14 -7.77=6.23
pouring cold water in your hot coffee is
conduction
convection
radiation
Pouring cold water into your hot coffee is convection. Therefore, option B is correct.
What is convection?Convection can be explained as the transfer of heat from one place to another because of the movement of fluid. Convective heat transfer can be defined as the combined processes of conduction and advection.
Gases as well as liquids are not good conductors of heat under normal pressure and temperature conditions, but they can easily transfer heat from one region to another region.
Convection takes place through diffusion but does not take place in solids substances, as there is no movement of constituent particles takes place. The diffusion of heat energy that occurs in solids is called thermal conduction.
Heat energy transfer that takes place between a surface and a liquid when they come in contact with the surface is called convection heat transfer. Therefore, heat transfer takes place through convection when pouring cold water into hot coffee.
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which action would not help a person stay safe during a tornado Giving brainliest
Answer:
B.... i think so, not sure lol
Answer:
B. Driving to get supplies
Explanation:
Don't drive in the middle of a tornado EHLBFDHS
Opinión personal sobre El Planeta
la tierra nuestro planeta es el único del sistema solar que sabe que mantiene vida: vida que es increíblemente diversa,
Which of the following is NOT true about ionic compounds?
A It is soluble in polar solvents
B.it is generally soluble in water and polar solvent
C.it has a lower melting temperature
D.it conducts electricity when in solution but not in solid phase
Answer:
C.it has a lower melting temperature
Explanation:
A good way to solve this problem may be to think about a simple ionic compound, such as salt, NaCl:
NaCl easily disolves in water, so options A and B are true about ionic compounds.Salt powder does not conduct electricity, however a concentrated solution of salt in water does. Meaning that option D is true as well.NaCl has a melting point of 801 °C, not particularly a low value. Thus the correct option is C.What volume will 5.00 mol of an ideal gas occupy at 25.0 C. and 153 kPa of pressure?
Answer:
5.00 mol of an ideal gas will occupy 103.6 L at 25.0 C and 153 kPa of pressure.
Explanation:
Using the ideal gas law, PV=nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin, we can solve for V.
First, we need to convert the temperature from Celsius to Kelvin by adding 273.15 K. Therefore, the temperature is 25.0 + 273.15 = 298.15 K.
Next, we can plug in the values we know:
PV = nRT
(153 kPa) V = (5.00 mol) (8.31 J/mol*K) (298.15 K)
Simplifying:
V = (5.00 mol) (8.31 J/mol*K) (298.15 K) / (153 kPa)
V = 103.6 L
Therefore, 5.00 mol of an ideal gas will occupy 103.6 L at 25.0 C and 153 kPa of pressure.
If a neutral atom has 54 protons and 70 neutrons what is the atomic number and mass number
Given that,
No. of protons (Z) : 54No. of neutrons (n) : 70we are to find
The atomic number Mass number(A)we know that,
atomic number = no. of protons in an atomatomic number of the given atom = 54and
Mass no. = No. of protons + No. of neutrons Mass no. of the given atom = 54 + 70 = 124what is the speed of an object traveling 200 meters in 2 hours
Answer:
What is the speed of an object traveling 50 m in five hours
Explanation:
how would you prepare 2000 ml of a pH = 1.50 solution using concentrated (12 M) HCl? (A 2 L volumetric flask is available.) explain procedure steps of solution preparation.
You would need to take 5 mL of the 12 M acid and then make up to the 2000 mL mark.
What is the dilution formula?The dilution formula is a mathematical expression used to calculate the new concentration of a solution . The dilution formula can be used to calculate the volume of a solution required in dilution. To use the formula, you must ensure that the units of concentration and volume are consistent
The final concentration of the solution is = Antilog (-1.5) = 0.03 M
Then;
12 * V = 2 * 0.03
Where V is the initial volume of the acid.
V = 0.005 L or 5 mL
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Consider the following reaction PCl3+Cl2 = PCl5. If the per cent yield is 66.3%, what mass of PCl5 is formed when 61.3g of Cl2 reacts with PCl3?
According to percent yield and stoichiometry, the mass of PCl₅ formed when 61.3 g of Cl₂ reacts with PCl₃ is 180.04 g when 61.3 g of Cl₂ reacts with PCl₃.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In the given example,as 70.90 g chlorine gives 208.24 g PCl₅ then according to stoichiometry,61.3 g of chlorine will give 61.3×208.24/70.90=180.04 g.
Thus, 180.04 g PCl₅ is formed when 61.3 g of Cl₂ reacts with PCl₃.
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b) 2.38 gm of a metal on treatment with nitric acid and sub sequent ignition gave 3.022 gm of the oxide. Specific heat of the metal is 0.055, calculate the extra atomic weight.
The extra atomic weight in a metal on treatment with nitric acid is 100.361 g/mol.
How to calculate extra weight?The first step is to calculate the mass of oxygen in the oxide formed:
Mass of oxygen = Mass of oxide - Mass of metal
Mass of oxygen = 3.022 g - 2.38 g
Mass of oxygen = 0.642 g
Use the specific heat of the metal to determine its identity:
specific heat = 6.4 / atomic weight
Solving for atomic weight:
atomic weight = 6.4 / specific heat
atomic weight = 6.4 / 0.055
atomic weight = 116.36 g/mol
The atomic weight to calculate the extra atomic weight:
extra atomic weight = atomic weight - atomic weight of oxygen
extra atomic weight = 116.36 g/mol - 15.999 g/mol
extra atomic weight = 100.361 g/mol
Therefore, the extra atomic weight is 100.361 g/mol.
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The following lists consists of ionic compounds EXCEPT
barium hydroxide, zinc carbonate, ammonium sulfate
calcium chloride, carbon disulfide, magnesium nitrate
sodium sulfate, copper(II) oxide, potassium nitride
aluminium sulfide, sodium sulfite, calcium fluoride
The following lists consists of ionic compounds except carbon disulfide (CS₂).
Barium hydroxide , Ba(OH)₂ is an ionic compound.
zinc carbonate, ZnCO₃ is an ionic compound.
ammonium sulfate , (NH₄)₂SO₄ is an ionic compound.
calcium chloride, CaCl₂ is an ionic compound.
carbon disulfide, CS₂ is not an ionic compound. In carbon disulfide both the elements are non metallic elements. The bond formed between atoms are by sharing of electron known as covalent bond due to very little difference in electronegativity.
magnesium nitrate, Mg(NO₃)₂ is an ionic compound.
sodium sulfate, Na₂SO₄ is an ionic compound.
copper(II) oxide, CuO is an ionic compound.
potassium nitride KNO₃ is an ionic compound.
aluminium sulfide, Al₂S₃ is an ionic compound.
sodium sulfite, Na₂S is an ionic compound.
calcium fluoride, CaF₂ is an ionic compound.
Thus, The following lists consists of ionic compounds except carbon disulfide (CS₂).
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Any science fair project ideas? Something for 7th or 8th grade level.
Answer:
maybe try to do something with electricity?
Explanation:
give me an update on when u find one :) cant wait to see it
Milk of magnesia, which is an aqueous suspension of magnesium hydroxide, is used as an antacid in the reaction below. How many molecules of HCl would have to be present to form 34.52 g of MgCl₂?
Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)
Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.
To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:
Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)
The molar mass of MgCl₂ is 95.21 g/mol.
First, we need to calculate the number of moles of MgCl₂ formed:
Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂
Moles of MgCl₂ = 34.52 g / 95.21 g/mol
Moles of MgCl₂ = 0.363 mol
According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:
Moles of HCl = 2 * Moles of MgCl₂
Moles of HCl = 2 * 0.363 mol
Moles of HCl = 0.726 mol
To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.
Number of molecules of HCl = Moles of HCl * Avogadro's number
Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol
Number of molecules of HCl = 4.37 x 10^23 molecules
Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.
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What are the reactants and products of a redox reaction, neutralization reactions, and precipitation reactions?
Answer:
Precipitation reactions are ones in which at least one of the reactants is in the aqueous phase (i.e., dissolved in water), and a solid forms on the product side which was not present on the reactant side. If all the reactants are solid, then a solid product forming should not be called a precipitate. To be called a precipitate, an insoluble product must form from within solution, either from a solid and solute interacting, or from an interaction strictly between solutes.
Explanation:
Estimate 16.540 +9.32 by first rounding each number to the nearest tenth.plis i need it
Answer:
Explanation:
16.540 + 9.32 by rounding each number to the nearest tenth
so 16.540 the number in the tenth place is 5, if its 5 then you have to round up because 1-4 you need to round down, and 5-9 you would have to round up. if you round 16.540 to the nearest tenth would be 17.
Next, if 9.32 the number in the tenth place is 3, since is 5 below you would have to round down which rounds down to 9
So its 17+9 which your answer would be 26.
What is the best definition of
nucleus?
A. The nucleus is the center of the atom.
B. The nucleus is the combination of several
substances.
C. The nucleus is the outer shell of the atom.
Answer: A
Explanation: You do the math to do the thingy
Answer: A Because I asked My teacher
Explanation: Hope it helps
The amount of space that matter takes up is its
Answer:
Mass is the amount of mass an object contains. Mass is measured using a scale. Volume is the amount of space matter takes up. Hope this helps you get an idea in your head!
Explanation:
How many grams of the salt CaF2 (g) are formed when 15.7 mL of 0.612 M KF reacts with an excess of aqueous calcium bicarbonate (Ca(HCO3)2) via a metathesis reaction?
Answer:
\(m_{CaF_2}0.375gCaF_2\)
Explanation:
Hello,
In this case, for the studied reaction:
\(2KF+Ca(HCO_3)_2\rightarrow CaF_2+2KHCO_3\)
Thus, the first step is to compute the reacting moles of potassium fluoride by using its volume and molarity:
\(n_{KF}=0.0157L*0.612\frac{mol}{L} =9.61x10^{-3}molKF\)
Then, we apply the 2:1 molar ratio between potassium fluoride and calcium fluoride to compute the produced moles of calcium fluoride:
\(n_{CaF_2}=9.61x10^{-3}molKF*\frac{1molCaF_2}{2molKF} =4.80x10^{-3}molCaF_2\)
Finally, by using the molar mass of calcium fluoride (78.07 g/mol) we can compute its produced grams:
\(m_{CaF_2}=4.80x10^{-3}molCaF_2*\frac{78.07gCaF_2}{1molCaF_2} \\\\m_{CaF_2}0.375gCaF_2\)
Best regards.
Balance the following reaction:
K3PO4 (aq) +
_Ca(OH)2 (aq) →
_Ca3(PO4)2 (s) +
KOH (aq)
Answer:
3 Ca(OH)2 + 2 K3PO4 ---> Ca3(PO4)2 + 6 KOH
Explanation:
Just balance each atom on both sides.
Which of the following processes is exothermic?
a.
sublimation of carbon dioxide
b.
evaporation of ammonia
c.
fusion of ethanol
d.
condensation of water
e.
vaporization of water
Answer:
d. condensation of water
Answer:
I believe the answer is D). condensation of water.
Hope this helps, have a great day/night and stay safe!