1. All societies base their calendars and timekeeping systems on the
apparent motion of the Sun and Moon.
how minimising the use of cars can help save the ozone layer
Answer:
minimizing the use of cars can help save the ozone layer by Minimizing the amount of gasoline which damages the ozone layer.
therefore the ozone layer is preserved.
have a nice day.
I need help with this question
Answer:
there is no question posted
Chemical equation=CH4 + O2 = CO2 + H2O.
i. identify the products of the chemical reaction.
ii. explain why these are the products based on trends in the periodic table (the number of
valence electrons, electronegativity, etc.).
iii. identify the types of bonds in the reactants and products.
iv. identify the number of each type of bond in the reactants and products.
v. identify the type of reaction
Answer:
1.The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.The combustion of methane or octane is exothermic; it releases energy. CH4 + 2 O2 → CO2 + 2 H2O + energy The energies of the products are lower than the energiies of the reactants.
Explanation:
How does moving water help shape earth?
Answer:
Moving water helps plant's and islands form and grow. Which shapes earth.
En condiciones normales 1g de aire ocupa un volumen de 773 mL ¿ qué volumen ocupará la misma masa de aire a 0 ºC y la presión a 93,3 KPa *
Answer:
El volumen que ocupará la misma masa de aire es 839.49 mL.
Explanation:
Las condiciones normales de presión y temperatura (abreviado CNPT) o presión y temperatura normales (abreviado PTN o TPN), son términos que implican que la temperatura referenciada es de 0ºC (273,15 K) y la presión de 1 atm (definida como 101.325 Pa).
La ley de Boyle dice que “El volumen ocupado por una determinada masa gaseosa a temperatura constante, es inversamente proporcional a la presión” y se matemáticamente como
Presión*Volumen=constante
o P*V=k
La ley de Charles es una ley que dice que cuando la cantidad de gas y de presión se mantienen constantes, el cociente que existe entre el volumen y la temperatura siempre tendrán el mismo valor:
[tex]\frac{V}{T} =k[/tex]
La ley de Gay-Lussac establece que la presión de un volumen fijo de un gas, es directamente proporcional a su temperatura. Se expresa matemáticamente como:
[tex]\frac{P}{T} =k[/tex]
Combinando estas tres leyes se obtiene:
[tex]\frac{P*V}{T} =k[/tex]
Siendo un estado inicial 1 y un estado final 2, la expresión anterior queda determinada como:
[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]
En este caso:
P1= 101325 PaV1= 773 mLT1= 273.15 KP2= 93,3 kPa= 93300 PaV2= ?T2= 0°C= 273.15 KReemplazando:
[tex]\frac{101325 Pa*773 mL}{273,15 K} =\frac{93300 Pa*V2}{273.15 K}[/tex]
y resolviendo obtenes:
[tex]V2=\frac{273.15 K}{93300 Pa} *\frac{101325 Pa*773 mL}{273,15 K}[/tex]
V2= 839,49 mL
El volumen que ocupará la misma masa de aire es 839.49 mL.
SOMEBODY HELP ME THIS IS MY THRID EVER QUESTION AND I NEED YOUR AMAZING HELP PLEASE PLEASE HELP ME FREINDS
Why does the earth experience high tides?
Lesson 3.01
Question 2 options:
High tides occur because Jupiter is in alignment with Saturn
This causes areas of water that bulge away from the earth.
The earth experiences high tides because the gravitational force of the moon attracts the water and solid earth, pulling them closer to the moon
High tides occur because the comet Neowise passed by Earth
Spring Tides: Choose ALL that apply
Lesson 3.01
Question 3 options:
Moon, Sun, and Earth are aligned
Highest of the high tides and lowest of the low tides.
Occurs twice a month
Moon, Sun, and Earth are perpendicular
Question 4 (1 point)
Choose ALL that apply for neap tides
Lesson 3.01
Question 4 options:
Moon, Sun, and Earth are in alignment
Smaller than normal range of high and low tides.
Gravity of the Sun and Moon work against each other
Moon and Sun are at right angles to the Earth
Question 5 (1 point)
What is the difference between rotation and revolution?
Lesson 3.03
Question 5 options:
Revolution is when an object travels in a path around another.
Rotation is when an object travels in a path around another.
Revolution is when an object spins around its axis.
Rotation is when an object spins around its axis.
Question 6 (1 point)
What is the shape of the planet's revolutions?
Lesson 3.03
Question 6 options:
It is a circle
It is an oval
It is elliptical
It is a sqare
Question 7 (1 point)
How long does it take for the Earth to make ONE revolution around the Sun? How long does it take for Earth to rotate?
Lesson 3.03
Question 7 options:
It takes a day. It takes a year
It takes a week. It takes a day.
It takes a year. It takes a day
It takes a day. It takes a week
Question 8 (1 point)
Earth's revolution causes day and night.
Lesson 3.03
Question 8 options:
True
False
Question 9 (1 point)
Why is it warmer in the summer?
Lesson 3.04
Question 9 options:
The earth's axis does not have a tilt
The rotation of Earth
The tilt of the earth's axis away from the sun allows those parts of the earth to have more sunlight.
The tilt of the earth's axis towards the sun allows those parts of the earth to have more sunlight.
Question 10 (1 point)
The seasons are caused by the tilt of Earth's axis
Lesson 3.04
Question 10 options:
True
False
Answer:
Answer 4. C and D also known as "Gravity of the Sun and Moon work against each other "
"Moon and Sun are at right angles to the Earth"
Answer 5. A and D also known as "Revolution is when an object travels in a path around another." "Rotation is when an object spins around its axis"
Answer 6. It is elliptical
Answer 7. It takes a year. It takes a day
Answer 8. False
Answer 9. The tilt of the earth's axis towards the sun allows those parts of the earth to have more sunlight.
Answer 10. True
Question 3
5 pts
The diagram shows a 21.7kg ball located on a shelf 1.6m above the ground. Which best describes the energy
of the ball?
o C. It has mechanical energy in the form of potential energy
O A. Its energy is lost once it falls off the shelf.
O B. Its energy depends upon the speed the ball will travel.
O D. It has mechanical energy in the form of kinetic energy.
Answer:
c
Explanation:
The ball of 21.7 kg which is located on a shelf 1.6 m above ground is having a mechanical energy in the form of potential energy. Hence, C best describes the energy of the ball.
What is potential energy ?Potential energy is the energy stored on it when the object is at rest. Kinetic energy of an object is generated by virtue of its motion. When a body starts moving its potential energy starts converts to kinetic energy.
The sum of kinetic and potential energy of an object is called its mechanical energy. An object has mechanical energy in the form of kinetic energy when it is at rest. When it starts to move its potential energy converts to kinetic energy.
Therefore, the ball of 21.7 kg placed in the shelf of height 1.6 m has a potential energy as long as it stays there on the shelf. Its potential energy = mgh
p = 21.7 kg × 9.8 m/s² × 1.6 m = 340.25 J
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1. How many liters of a 0.50 M solution are needed to give 3.5 moles of solute?
Answer:
The volume of solution in liters required to make a 0.250 M solution from 3.52 moles of solute is 14.08 liters of solution
Explanation:
The question relates to the definition of the concentration of a solution which is the number of moles per liter (1 liter = 1 dm³) of solution
Therefore we have;
The concentration of the intended solution = 0.250 M
Therefore, the number of moles per liter of the required resolution = 0.250 moles
Therefore, the concentration of the required solution = 0.250 moles/liter
The volume in liters of the required solution that will have 3.52 moles of the solute is given as follows;
The required volume of solution = The number of moles of the solute/(The concentration of the solution)
∴ The required volume of solution = 3.52 moles/(0.250 moles/liter) = 14.08 liters
The required volume of solution to make a 0.250 M solution from 3.52 moles of solute = 14.08 liters.
Therefore the number of liters required to make a 0.250 M solution from 3.52 moles of solute = 14.08 liters.
Can someone help please
Answer:
fuse
Explanation:
fuses are made by metal alloys , have low melting point
How many atoms in 12 moles of Mg?
4A1 + 302 →
2Al2O3. How many grams of oxygen (O2)
are needed to produce 95 grams of
aluminum oxide (Al2O3)?
Answer: 44.706g Al2O3
Explanation:
4A1 + 302 → 2Al2O3
3×(16×2) 2{(27×2)+(16×3)}
= 96 = 204
So
To produce 204g of Al2O3,We need . 96g of O2
To produce 1g of Al2O3,We need
. (96÷204)= 0.47g of O2
To produce 95g of Al2O3,We need
. (0.47×95)= 44.706g of O2
.
So, 44.706 grams of oxygen (O2)
are needed to produce 95 grams of
aluminum oxide (Al2O3).
How many grams of sodium metal must be introduced to water to produce 3.3 grams of hydrogen gas?
Answer:
The mass of sodium metal that must be introduced to water to produce 3.3 grams of hydrogen gas, H₂, is approximately 18.82 grams of sodium metal
Explanation:
The given mass of hydrogen gas produced = 3.3 grams
The molar mass of hydrogen gas, H₂ = 2.016 g/mol
The number of moles of hydrogen gas in 3.3 grams of H₂, 'n', is given as follows;
n = Mass/(Molar mass)
n = 3.3 g/(2.016 g/mol) = 1.63690476 moles of H₂
The reaction of sodium and water can be written as follows;
2Na + 2H₂O → 2NaOH + H₂ (g)
2 moles of sodium produces 1 mole of hydrogen gas, H₂
Therefore;
1.63690476/2 moles of sodium will produce 1.63690476 moles of hydrogen gas, H₂
The molar mass of sodium, Na ≈ 22.989 g/mol
The mass of 1.63690476/2 moles of sodium, 'm', is given as follows;
m = 1.63690476/2 moles × 22.989 g/mol ≈ 18.8154018 grams ≈ 18.82 grams
The mass of sodium that will produce 3.3 grams of hydrogen, m ≈ 18.82 grams of sodium metal.
Explain the electrolysis of acidified water
Answer:
yqaeh
Explanation:
Electrolysis of acidified water
Water is a poor conductor of electricity, but it does contain some hydrogen ions , H +, and hydroxide ions, OH -. These ions are formed when a small proportion of water molecules naturally dissociate . ... H + ions are attracted to the cathode , gain electrons and form hydrogen gas.
How do I do nunber 8?
Answer:
DONT CLICK THAT LINK THAT IS HACK AND VIRUS
Explanation:
Excessive use of chemical fertilizer cause chemical pollution.How?
Explanation:
Chemical fertilizers raise crop yields, but their heavy usage has hardened the soil, diminished fertility, reinforced pesticides, contaminated air and water, and emitted greenhouse gases, posing health and environmental risks.
When a substance freezes, _____.
it releases thermal energy
it absorbs thermal energy
it changes from a solid to a liquid
its temperature drops
Answer:
It's temperature drops, and if releases thermal energy
Answer:
Its temperature drops
Describe the region(s) of the Atlantic Oceans where dense waters will likely sink/
Answer:
The densest ocean water is formed in two primary locations near the poles, where the water is very cold and highly saline as a result of ice formation. The densest deep water mass is formed in the Weddell Sea of Antarctica, and becomes the Antarctic Bottom Water (AABW).
Explanation:
The densest ocean water is formed in two primary locations near the poles, where the water is very cold and highly saline as a result of ice formation. The densest deep water mass is formed in the Weddell Sea of Antarctica, and becomes the Antarctic Bottom Water (AABW).
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, north Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the metal ball ÷volume marked on the graduated cylinder
North Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink. Here, water is very cold and salty which makes the water denser.
Therefore, north Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink.
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Oo help it’s for a grade
Answer: D.kinectic energy
Explanation
For which of the reactions listed below will Gibbs free energy always be.
positive?
O A. An exothermic reaction that decreases in entropy
B. An exothermic reaction that increases in entropy
O C. An endothermic reaction that decreases in entropy
D. An endothermic reaction that increases in entropy
I think the answer is: C. An endothermic reaction that decreases in entropy
An endothermic reaction that decreases in entropy. Hence, option C is correct.
What is entropy?Entropy is the energy of a system that is unuseful to do work.
For a reaction to be spontaneous, the Gibbs' Free Energy must be negative.
The equation for Gibbs Free energy is given by:
G= H-TS
Where, G = Gibbs free energy
H = Enthalpy of the reaction
T = Temperature of the system
S = Entropy of the system
Sign convention for all the quantities:
For H: It is negative for exothermic reactions and positive for endothermic reactions
For S: It is positive when there is an increase in entropy and it is negative when there is a decrease in entropy.
If we want G to be negative, the conditions necessary are:
G= (-ve) - (+ve) = -ve
The product of temperature and entropy must be positive and that will be positive when there is increase in entropy at any temperature.
Hence, option C is correct.
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carbon-dating was performed on an artefact that was found to have 25% of the original carbon-14 remaining in it
this is the work
I'm rlly confused what should I write?
Answer:
Q 1: Why did the man get sick but not his children? Why did he use a cube?
Q 2: By knowing how he heated the water and everything we can infer what happened to him and not his children.
Explanation:
Hope this helps! plz mark brainliest <3
Answer:
Ill just comment this for fun So he can get brainliest since u need 2 comments for that
heeeeeeeeeeeeeeeeeeeeeeeeeeeeeelp
If magnesium and nickel were used as electrodes to construct an electrochemical cell like the one shown at right, which metal would form the anode and which the cathode?
anode:
cathode:
Answer:
anode: magnesium
cathode: nickel
Explanation:
edg. 2021
Which of the following is NOT a common property of water?
o Water has high surface tension.
o Water expands when it freezes.
o Ice is less dense than water.
o Water has low heat of vaporization.
Answer:
A = water has high surface tension
the answer is a hope this helps and plz give me brainlist :)
Calculate the pH during the titration of 20.00 mL of 0.1000 M HNO2(aq) with 0.1000 M KOH(aq) after 13.27 mL of the base have been added. Ka of nitrous acid = 7.1 x 10-4.
Answer:
pH = 2.462.
Explanation:
Hello there!
In this case, according to the reaction between nitrous acid and potassium hydroxide:
[tex]HNO_2+KOH\rightarrow KNO_2+H_2O[/tex]
It is possible to compute the moles of each reactant given their concentrations and volumes:
[tex]n_{HNO_2}=0.02000L*0.1000mol/L=2.000x10^{-3}mol\\\\n_{KOH}=0.1000mol/L*0.01327L=1.327x10^{-3}mol[/tex]
Thus, the resulting moles of nitrous acid after the reaction are:
[tex]n_{HNO_2}=2.000x10^{-3}mol-1.327x10^{-3}mol=6.73x10^{-4}mol[/tex]
So the resulting concentration considering the final volume (20.00mL+13.27mL) is:
[tex][HNO_2]=\frac{6.73x10^{-4}mol}{0.01327L+0.02000L} =0.02023M[/tex]
In such a way, we can write the ionization of this weak acid to obtain:
[tex]HNO_2+H_2O\rightleftharpoons NO_2^-+H_3O^+[/tex]
So we can set up its equilibrium expression to obtain x as the concentration of H3O+:
[tex]Ka=\frac{[NO_2^-][H_3O^+]}{[HNO_2]}\\\\7.1x10^{-4}=\frac{x^2}{0.02023M-x}[/tex]
Next, by solving for the two roots of x, we get:
[tex]x_1=-0.004161M\\\\x_2=0.003451M[/tex]
Whereas the correct value is 0.003451 M. Finally, we compute the resulting pH:
[tex]pH=-log(0.003451)\\\\pH=2.462[/tex]
Best regards!
What is the diameter of Neptune in standard notation and scientific notion?
Answer:
Standard notation: 49,244 km
Scientific notation: 4.92x10⁴ km
Explanation:
The diameter of Neptune in standard notation is:
49,244 km
In the standard notation, we write the result in a normal way.
Now, to express the diameter in scientific notation we need to use a base ten power as follows:
4.92x10⁴ km
In the above result, the positive exponent indicates that the number is larger. The decimal point is located near the first digit.
Therefore, the diameter of Neptune in standard notation is 49,244 km and in scientific notation is 4.92x10⁴ km.
I hope it helps you!
A(n)____ is a ripened ovary
pleaseeeeeeeeeee someone help urgent we are writing a test tmr can some one please explain subatomic particles to me...
Answer:
n physical sciences, subatomic particles are smaller than atoms. They can be composite particles, such as the neutron and proton; or elementary particles, which according to the standard model are not made of other particles. Particle physics and nuclear physics study these particles and how they interact.
Explanation:
a particle smaller than an atom (e.g., a neutron) or a cluster of such particles (e.g., an alpha particle).
Does a reaction occur when aqueous solutions of sodium sulfide and manganese(II) chloride are combined?
Oyes Ono
If a reaction does occur, write the net ionic equation.
Answer:
Yes, a reaction occurs
Explanation:
net ionic equation
Mn 2+ (aq) + S 2- (aq) --> MnS (s)