How many miles will a person run a 400 km race?

Answer:

A

Explanation:

Says it on the side of meh screen :P

(Ez question in lol)

Answer:

2 moles of water (H₂O)

Explanation:

We'll begin by calculating the number of mole in 4 g of Hydrogen. This can be obtained as follow:

Mass of H₂ = 4 g

Molar mass of H₂ = 2 × 1 = 2 g/mol

Mole of H₂ =?

Mole = mass / Molar mass

Mole of H₂ = 4/2

Mole of H₂ = 2 moles

Finally, we shall determine the number of mole of water (H₂O) produced by the reaction of 4 g (i.e 2 moles) of H₂. This can be obtained as follow:

2H₂ + O₂ —> 2H₂O

From the balanced equation above, we can see that 2 moles of H₂ reacted to produce 2 moles of H₂O.

Thus, 2 moles of water (H₂O) were obtained from the reaction.

Answer:

Magnesium

Explanation:

Magnesium reacts  with  air (oxygen) to form metal oxide.

Answer:

most elements are metals

Answer:

48.018 g/mol

Explanation:

Answer:

The molar mass and molecular weight of CH2O2 is 46.025.

Explanation:

Answer:

Number of silver atoms

=

0.0134

⋅

m

o

l

×

N

A

.  

N

A

=

Avogadro's number

Explanation:

Silver has a molar mass of  

107.87

g

⋅

m

o

l

−

1

.

What does this mean? It means that if I have such a mass of silver, there are Avogadro's number,  

N

A

=

6.022

×

10

23

,  

individual silver atoms.

So all I have to do is divide the mass by the molar mass, and multiply this number (a molar quantity!) by Avogadro's number.  

So, moles of silver  

=

1.45

⋅

g

107.87

⋅

g

⋅

m

o

l

−

1

=

0.0134

⋅

m

o

l

And  

number of silver atoms

=

0.0134

⋅

m

o

l

×

6.022

×

10

23

⋅

silver atoms  

m

o

l

−

1

=

?

?

silver atoms

Explanation:

Answer:

jupiter

Explanation:

mercury, venus, earth, mars, jupiter, saturn, uranus, neptune,

Answer:

it will option A . hope it helps

Answer:

options A

Explanation:

the balloon filled up because of the formation of gas bubbles

Answer:

Potassium is an element, with the symbol K

Explanation:

An element is something that cannot be broken down any further, for example, calcium, its Ca.

A compound is when you bond two or more elements. Compounds can be broken down into its original elements, for example, H₂O, it contains two atoms of hydrogen and one atom of oxygen (both hydrogen and oxygen are elements).

Answer:

A lunar phase is simply the shape of the sunlit part of the Moon, as seen from Earth. Phases are so strikingly obvious that we almost take them for granted. Moreover, they can be observed easily throughout the month from the backyard or via a simple glance out the window.

The Moon's shape changes for the following reasons:

The Moon orbits Earth.

Both Earth and the Moon orbit the Sun.

The Moon's orbit is the same length as the time it spins on its axis (about 28 Earth days), which means that we see the same part of the lunar surface all month.

The Sun illuminates both Earth and the Moon.

Get to Know the Lunar Phases

There are eight phases of the Moon to track each month.

New Moon: During New Moon, the side of the Moon facing us is not illuminated by the Sun. At this time, the Moon is not up at night, but it is up during the day. We just can't see it. Solar eclipses can occur during the New Moon, depending on how the Sun, Earth, and Moon line up in their orbits.

Waxing Crescent: As the Moon waxes (grows) into its crescent phase, it begins to show up low in the sky right after sunset. Look for a silvery-looking crescent. The side facing the sunset direction will be lit up.

First Quarter: Seven days after New Moon, the Moon is in first quarter. Only half of it is visible for the first half of the evening, and then it sets.

Waxing Gibbous: After First Quarter, the Moon appears to grow into a gibbous shape. Most of it is visible, except for a dark sliver that shrinks over the next seven nights. Look for the Moon at this time during the afternoon, too.

Full Moon: During the Full Moon, the Sun lights up the entire surface of the Moon that faces Earth. It rises just as the Sun sets and disappears beneath the western horizon when the Sun rises the next morning. This is the brightest phase of the Moon and it washes out the nearby part of the sky, making it difficult to see stars and faint objects such as nebulae.

Ever hear of a Super Moon? That's a Full Moon that happens when the Moon is closest in its orbit to Earth. The press likes to make a big deal about this, but it's really a very natural thing: On occasion, the Moon's orbit brings it closer to Earth. Not every month has a Super Moon. Despite the hype about Super Moons in the media, it's difficult for the average observer to notice one, because the Moon might appear only slightly larger in the sky than normal. In fact, the well-known astronomer Neil deGrasse Tyson pointed out that the difference between a regular Full Moon and a Super Moon is analogous to the difference between a 16-inch pizza and a 16.1-inch pizza.

Lunar eclipses occur only at Full Moons because the Moon is passing directly between Earth and the Sun in its orbit. Due to other perturbations in its orbit, not every Full Moon results in an eclipse.

The other Full Moon variation that often grabs media attention is a "Blue Moon." That's the name given to the second Full Moon that occurs in the same month. These don't happen all the time, and the Moon certainly doesn't appear blue. Full Moons also have colloquial names based on folklore. It's worth reading about some of these names; they tell fascinating stories about early cultures.

Waning Gibbous: After the glorious appearance of Full Moon, the lunar shape starts to wane, meaning it gets smaller. It's visible later at night and into the early morning, and we see a steadily shrinking shape of the lunar surface that's being lit up. The side that is lit up is facing toward the Sun, in this case, the sunrise direction. During this phase, look for the Moon during the day—it should be in the sky in the morning.

Last Quarter: At Last Quarter, we see exactly half the sunlit surface of the Moon. It can be seen in the early morning and daytime sky.

Waning Crescent: The last phase of the Moon before returning to New Moon is called Waning Crescent, and it is exactly what it says: a steadily-shrinking crescent phase. We can see only a small sliver from Earth. It's visible in the early morning, and by the end of the 28-day lunar cycle, it has vanished almost entirely. That brings us back to New Moon to start the new cycle.

Citation for work-Petersen, Carolyn Collins. "The Once-Mysterious Phases of the Moon Explained." ThoughtCo, Aug. 27, 2020, thoughtco.com/what-are-moon-phases-3883581.

Explanation:  

Something shorter-The different shapes of the lit portion of the Moon that can be seen from Earth are known as phases of the Moon. Each phase repeats itself every 29.5 days. The same half of the Moon always faces the Earth, because of tidal locking. So the phases will always occur over the same half of the Moon's surface.

Answer:

1. electrical conductor

2. orbit

3. potential energy

4. magnetic field

5. net force

6. B; repulsion

7. A; copper

8. B; there is no gravitational attraction between you and the cup, but Earth's gravity is stronger, so Earth's gravity pulls the cup down

9. A; the net force is acting in an upward direction

10. A; position 1

11. A; the gravitational force between two objects depends on their masses

12. C; the chemical potential energy of the spring is greatest at position 4

13. C; hand-held compass

14. C; a person skiing down a hill

15. A; the ions will repel each other

16. A; position A

17. three properties of magnets are attraction because they attract certain materials, repulsion because magnetic poles repel, and directive because a magnet that is freely suspended will always point in a north-south direction.

18. to increase the strength of an electromagnet you can either increase the strength current or increase the number of windings.

i hope this helps :)

Answer:

double replacement (Mutual exchange of ions)

Explanation:

GOOD LUCK FOR THE FUTURE! :)

Answer:

Uranium, Zinc, titanium, Gold, Copper , silver and more

Explanation:

Answer:

ACTIVITY 1

Sample 1 has a stronger taste of lemon, and is more sour.

Sample 2 has a sweeter taste, my guess is because there's more sugar:lemon juice ratio.

Answer:

KNO3 (Potassium Nitrate)

Explanation:

I just know.

Answer:

The answer is D. The rate of the forward reaction is greater than the rate of the reverse reaction.

Explanation:

The forward reaction rate was greater than the reverse reaction rate because more product is present at time 2. This is the answer from ap classroom.

The given reaction has been inferred the increased rate of forward reaction than reverse reaction. Thus, option D is correct.

The chemical reaction has been given by the combination of reactants for the formation of product. The reactants combine in the fixed proportion to form the product.

The rate of reaction has been defined as the rate of formation of product or the disappearance of reactants.

The forward reaction has been given as the rate of formation of product. The reverse reaction has been given as the rate of dissociation of product.

In the given condition, the number of reactant at time 1 are more than the reactant at time 2. This states that there has been increased formation of the product at time 2.

Thus, the given reaction has been inferred the increased rate of forward reaction than reverse reaction. Thus, option D is correct.

Learn more about reverse reaction, here:

https://brainly.com/question/8592296

Answer:

all organisms in the jungle

Explanation:

Scientists are studying cellular respiration in a jungle ecosystem that has plants, animals and decomposers, so all organisms in the jungle carry out cellular respiration.

Cellular respiration is a process in which organism use the oxygen molecule for the conversion of their food materials to get the chemical energy by the product of water and carbon dioxide.

This respiration process is done by all living organism like plants, animals, insects, bacteria, etc. to get energy for the other cellular functions. So, in the ecosystem of jungle plants, animals and decomposers all will perform cellular respiration.

Hence, option (c) is correct i.e. all organisms in the jungle.

To know more about cellular respiration, visit the below link:

https://brainly.com/question/25921566

Answer:

A=79,N=44

Z=35,A=79

Answer:

Explanation:

Answer:

A=79,N=44

Z=35,A=79

Answer:

0.905

Explanation:

Answer:

x = 181/200

Explanation:

2534 = 112 . 25 . x (Multiply 112 and 25)

2534 = 2800x (Divide by 2800 from both sides)

x = 2534 / 2800 (Simplify)

x = 181/200 or 0.905

your answer will be March 3

Answer:

its a body or assembly of popular elected represenatives

Explanation:

which the purpose of this is to form a representative democracy

hope this helps

Answer:

Explanation:

A molecule, for example of water, contains 2 hydrogen atoms and 1 oxygen atom chemically bonded together and is the smallest building block of the chemical water. ... A mole is a certain quantity of molecules, specifically 6.02 x 10^23.

Hope this helps!

Answer:

D. 4.20%

Explanation:

Given the following data:

Accepted value = 524 degrees

Experimental value = 546 degrees

To find the percentage error;

Percent error can be defined as a measure of the extent to which an experimental value differs from the theoretical value.

Mathematically, it is given by this expression;

[tex] Percent \; error = \frac {accepted \;value - experimental \; value}{ accepted \;value} *100[/tex]

Substituting into the equation, we have;

[tex] Percent \; error = \frac {524 - 546}{ 524} *100[/tex]

[tex] Percent \; error = \frac {22}{524} *100[/tex]

Note: the negative sign is ignored when calculating percentage error.

[tex] Percent \; error = 0.04199 *100[/tex]

Percent error = 4.199 ≈ 4.2%

Answer:

the answer is A ( The basement)

HOPE THAT HELPSSS!!!

Answer the basement

Explanation: i took the test

Answer:

200 I would think..

Explanation:

Feel free to correct me if i'm wrong

Is there any multiple choice??

Answer:

A not

B yes

C yes

D yes

Explanation:

A 2C 6H but 10O and 7O so no

B 3C 6O 2Fe on each side  so yes

C 4H 1S 6O 2Na so yes

D 2Ag 2Cl 1Ca 2N 6O so yes

Answer:

Limiting: Lab covers. Books produced: 75. Excess amounts: In explanation

Explanation:

Amount that can be produced with just lab covers: 75 books (150/2)

Amount that can be produced with just lined paper: 150 books (7500/50)

Amount that can be produced with graph paper: 120 (3000/25)

Amount that can be produced with staples: Approximately 83 (250/3)

As we can see, the lab covers are limiting as they can only produce 75 books. So, we can only make 75 books.

You will have 3,750 lined paper left over (or 75 books)

(150-75=75 , 75*50=3,750)

You will have 1,125 graph paper left over (or 45 books)

(120-75=45 , 75*25=1,875 , 3000-1875=1125)

And then you will have approximately 25 staples left over (or 8 books)

(83-75=8 , 8*3=225, 250-225=25)

(Hopefully this is correct, I apologize if I messed up)

Answer:

Explanation:

Silver has a molar mass of 107.87 g⋅mol−1 . What does this mean? It means that if I have such a mass of silver, there are Avogadro's number, NA=6.022×1023 , individual silver atoms

The number of silver atoms in 1 mole of silver. Avogadro's constant is

defined as the number of units in one mole of a substance.

Avogadro's constant is denoted by the following below:

NA = 6.022×10²³ mol⁻¹.

In the question, we were asked for the number of silver atoms in 1 mole of a

substance which is equivalent to the Avogadro's constant.

This means the number of atoms in 1 mole of silver = 6.022×10²³ mol⁻¹.

Read more on https://brainly.com/question/15989275