If a star is 300 light years away from Earth, how long does it take light from that star to reach Earth?
A. 300 days
B. 300 hours
C. 300 years
D. 300 light years

Answers

Answer 1
It would take 300 light years to reach Earth

Related Questions

Example 1 How much water (in grams) is produced when 65.2 grams of Calcium carbonate react with phosphoric acid to form calcium phosphate, water, and carbon dioxide?​

Answers

Answer:

11.75 g H2O

Explanation:

3CaCO3 + 2H3PO4 --> Ca3(PO4)2 + 3H2O + 3CO2

MM H2O = 18.02 g/mol

MM CaCO3 = 100 g/mol

? g H2O = mass CaCO3 x (1 mol CaCO3/MM CaCO3) x (3 moles H2O/3 moles CaCO3) x (MM H2O / 1 mol H2O) = (65.2/100) x 18.02 = 11.75 g H2O

Find the mass of 3.27 x 10^23 molecules of H2SO4. Use 3 significant digits
and put the units.

Answers

Answer:

Approximately [tex]53.3\; \rm g[/tex].

Explanation:

Lookup Avogadro's Number: [tex]N_{\rm A} = 6.02\times 10^{23}\; \rm mol^{-1}[/tex] (three significant figures.)

Lookup the relative atomic mass of [tex]\rm H[/tex], [tex]\rm S[/tex], and [tex]\rm O[/tex] on a modern periodic table:

[tex]\rm H[/tex]: [tex]1.008[/tex].[tex]\rm S[/tex]: [tex]32.06[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].

(For example, the relative atomic mass of [tex]\rm H[/tex] is [tex]1.008[/tex] means that the mass of one mole of [tex]\rm H\![/tex] atoms would be approximately [tex]1.008\![/tex] grams on average.)

The question counted the number of [tex]\rm H_2SO_4[/tex] molecules without using any unit. Avogadro's Number [tex]N_{\rm A}[/tex] helps convert the unit of that count to moles.

Each mole of [tex]\rm H_2SO_4[/tex] molecules includes exactly [tex](1\; {\rm mol} \times N_\text{A}) \approx 6.02\times 10^{23}[/tex] of these [tex]\rm H_2SO_4 \![/tex] molecules.

[tex]3.27 \times 10^{23}[/tex] [tex]\rm H_2SO_4[/tex] molecules would correspond to [tex]\displaystyle n = \frac{N}{N_{\rm A}} \approx \frac{3.27 \times 10^{23}}{6.02 \times 10^{23}\; \rm mol^{-1}} \approx 0.541389\; \rm mol[/tex] of such molecules.

(Keep more significant figures than required during intermediary steps.)

The formula mass of [tex]\rm H_2SO_4[/tex] gives the mass of each mole of [tex]\rm H_2SO_4\![/tex] molecules. The value of the formula mass could be calculated using the relative atomic mass of each element:

[tex]\begin{aligned}& M({\rm H_2SO_4}) \\ &= (2 \times 1.008 + 32.06 + 4 \times 15.999)\; \rm g \cdot mol^{-1} \\ &= 98.702\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

Calculate the mass of approximately [tex]0.541389\; \rm mol[/tex] of [tex]\rm H_2SO_4[/tex]:

[tex]\begin{aligned}m &= n \cdot M \\ &\approx 0.541389\; \rm mol \times 98.702\; \rm g \cdot mol^{-1}\\ &\approx 53.3\; \rm g\end{aligned}[/tex].

(Rounded to three significant figures.)

Why is Newton's first law of motion is sometimes called the law of inertia

Answers

Answer:

The reason why Newtons first law of motion is sometimes called the law of inertia is because it states that if the object is in motion, it will not rest unless an unbalanced force acts on the object.

6. Three ice cubes are placed inside a glass of hot chocolate. Which of the following best
explains the heat transfer occurring inside the glass?
bat abanslate
ITS NUMBER 6!!!
PLZZ HELP ASAP!!!

Answers

It’s the first 1 M yea it’s the first one

If more reactants are used in a chemical reaction, more products will be
produced. This is because *
1 point
More reactants have more atoms to react to form more products
More reactants take up the same volume
Too many products can slow down the reaction
More reactants cause the reaction to heat up

Answers

More reactants have more atoms to react to form more products.

More reactants have more atoms to react to form more products in a chemical reaction.

What is a Chemical reaction?

This is the process which involves two or more molecules known as reactants collide with the right orientation and force to form a new product.

Increase in reactants means presence of more molecules involved in the reaction thereby leading to the formation of more product.

Read more about Chemical reaction here https://brainly.com/question/11231920?source=archive

The following diagram represents the potential energy for the reaction:



The curves represent two possible reaction paths for the decomposition of ammonia, NH3. One can correctly conclude from the graph that the largest activation energy shown for the decomposition of NH3 corresponds to which labeled interval?

C
E
A
B
D

Answers

A is the answer I reckon

Answer:

Look in the picture ;)

Explanation:

1. In_____particles are in contact with each other.

Answers

Answer:

condensed matter should be your answer

Explanation:

For the reaction 2h2+o2>h20, how many grams of water are produced from 70 grams of hydrogen

Answers

630g

Explanation:

firstly the equation has to be balanced. 2H2+o2>2H2o.

finding the mole of hydrogen?

mole = 70/2 which is equal to 35 mole of hydrogen.

35 mole of hydrogen is equal to the mole of water.

finding the mass of water=?

35=mass/18

mass= 35*18=630g of water

Observa los dibujos cada uno representa una sustancia. Cada bolita representa un simboliza un átomo de un elemento.

Answers

Answer:

A: Elemento

B: Elemento

C: Elemento

D: Compuesto

E: Elemento

F: Compuesto

G: Compuesto

H: Compuesto

I: Elemento

J: Compuesto

K: Elemento

L: Elemento

Se adjunta la imagen con los dibujos.

Explanation:

Un elemento químico está compuesto por átomos específicos, por ejemplo el oxígeno, el helio, el sodio, cloro. Por otro lado, un compuesto químico es la combinación de dos o más elementos químicos diferentes, por ejemplo, cloruro de sodio, que forma por la combinación de sodio y cloro (NaCl), dióxido de carbono, que se forma por la unión de carbono con tres átomos de oxígeno (CO₃), agua que se forma por la combinación de dos átomos de hidrógeno con un átomo de oxígeno(H₂O), etc.

True or false: All molecules or atoms in a substance have the same amount of kinetic energy at a given temperature?

Answers

Answer:

1

False. if they all moved together at any time then it would be a million things withinthe human species all at once at a high rate

What causes heat or the transfer of energy from one object to another

Answers

Answer:

The answer is kinetic energy

2NO+2CO N 2 +2CO 2 There are 3.0 g of NO and 3.0 g of CO reacting . What is the limiting reactant ?

Answers

Answer: NO

Explanation:

As per the given balanced equation, 2 moles of NO reacts with 2 moles of CO. Hence, 3 g or 1.07 moles of CO needs to react with the same number of moles of NO. But we have only 3 g or 0.1 mole of NO. Hence, NO is the limiting reactant.

What is limiting reactant ?

A limiting reactant in a reaction is the reactant which is fewer in amount or consume early without complete reaction with other reactants. Hence, as soon as this reactant is consume, the reaction stops.

Given 2 moles of NO reacts with 2 moles of CO.

molar mass of NO =  30 g/mol

molar mass of CO = 28 g/mol.

Number of moles in  3 g of CO = 3/28 = 1.07 moles

number of moles in 3 g of NO = 3/30 = 0.1 moles.

1.07 moles of CO needs 1.07 moles of NO. But only 0.1 moles are present.

Therefore, NO is the limiting reactant in this reaction.

Find more on limiting reactants:

brainly.com/question/14225536

#SPJ2

x=2 and y=3
find the value of
3x + y
3x² - 4
solve this please ty​

Answers

Answer:

3x+y = 9

3x² - 4 = 8

Explanation:

3x+y

3(2)+3

9

3x2-4

3(2)^2-4

3

2. What is forensic odontology ? Why is this area helpful for investigators?

Answers

Explanation:

forensic odontology is the study of dental applications in legal proceedings. which may include bite marks.

it is helpful as it allows for the identification of unknown bodies through dental records.

Answer:

Also called forensic dentists, forensic odontologists are typically called in to: Identify human remains that cannot be identified using face recognition, fingerprints or other means. Identify bodies in mass fatalities, such as plane crashes and natural disasters. This area is helpful for investigators as it helps find more evidence for each case.

Helppp me pretty please

Answers

Answer:

I think the correct answer would be the second one

I believe the answer is d. all the above

PLEASE HELP: 60 POINTS

Select all that apply!

The emission of a Beta particle has the effect of:


a change in mass of an electron emitted from the nucleus
decreasing mass by one unit
increasing mass by one unit
adding a proton to the nucleus
converting 1 neutron to 1 electron and 1 proton

Answers

the answer is “decreasing mass by one unit”

PLEASE HELP GUYS PLEASE!!!! I will LOVE WHOEVER HELP
ME FOREVER

Answers

Answer:

B. It is highly flammable.

Explanation:

Chemical properties deal with how the substance will behave when brought into contact with other substances, and usually have to do with it undergoing some kind of reaction. Flammability is a chemical property.

Density, melting point, and color are all considered physical properties.

Answer:

d

Explanation:

ignition is a chemical. reaction

Lithium forms ions with a charge of lt Oxygen forms ions with a charge of 2- in the ionic compound lithium oxide, how many
atoms of lithium will there be if there is 1 atom of oxygen?
HELP ME

Answers

Answer:

There are 2 lithium atoms in the ionic compound lithium oxide, Li₂O

Explanation:

The charge of ions formed by lithium = 1⁺

The charge of ions formed by oxygen = 2⁻

In the ionic compound lithium oxide having 1 atom of oxygen, we have;

For the compound to be electronically neutral, the sum of the charges of the atoms in the ionic compound is zero

The charge of 1 atom of oxygen in the lithium oxide compound + The charge of the 'n' number of lithium atoms in the lithium oxide compound = 0

∴ 2⁻ + n × 1⁺ = 0

n × 1⁺ = 0 - 2⁻ = 2⁺

n = 2⁺/(1⁺) = 2

n = 2

The number of lithium atoms in the lithium oxide compound, n = 2

Therefore, there are two lithium atoms in the ionic lithium oxide (Li₂O) compound

Which hypothesis is directly tested in an experiment?

a. One specific confounding variable hypothesis.
b. All of the confounding variables hypotheses.
c. The research hypothesis.
d. both b and c

Answers

the answer is d because i took the test and got the right answer

When you watch a sunset, is the Sun really moving across the sky? What's happening?
(Science)

Answers

It is the earth spinning around its axis. It makes a complete turn every 24 hours. It turns toward the east

The faster rate of reaction was caused by using a higher temperature. Explain, in terms of particles, why a higher temperature causes a faster rate of reaction.

Answers

Answer:

Increasing the temperature a reaction takes place at increases the rate of reaction. At higher temperatures, particles can collide more often and with more energy, which makes the reaction take place more quickly.

Explanation:

ILL GIVE 100 POINTS!!!HELP!! THIS IS FOR CHEM!!an object acted upon by an unbalanced force will accelerate in the direction of the force is newtons what law?

1:second law

2:first law

3:third law

Answers

it’s newton’s first law but that’s a physics question

Why is fluorine a gas at room temperature?
GIVING BRAINLIEST AND LOTS OF POINTS ‼️‼️

Answers

Answer:

In fluorine, the electrons are tightly held to the nuclei. The electrons have little chance to wander to one side of the molecule, so the London dispersion forces are relatively weak. At a low enough temperature the molecules will all be solids. At a high enough temperature they will all be gases.

Explanation:

How many moles are in 122 g of Cu? Conversion factor: 1 mol = molar mass

Answers

122g (1 mol/63.546g Cu)

1.92 mol

Answer:

122g/63.5

1.92 mol

What is the molar mass of the following compound: C1H3P2

Answers

the molar mass is44.26

Can y’all helping me solving this l will make you the brainlest❤️

Answers

Answer:

Genotype = genetic makeup or allele combination

phenotype = physical appearance

homzygous = both alleles are the same

heterozygous = both alleles are different

dominant allele = represented by a capital letter

recessive allele = lowercase letter

What is matter? Write any two properties of matter?​

Answers

Answer:

anything that has weight and occupies space

Explanation:

Matter is anything, such as a solid, liquid or gas, that has weight (mass) and occupies space.  

For anything to occupy space, it must-have volume.

how heart attacks and Strokes caused by cholesterol​

Answers

With high cholesterol, you can develop fatty deposits in your blood vessels. Eventually, these deposits grow, making it difficult for enough blood to flow through your arteries. Sometimes, those deposits can break suddenly and form a clot that causes a heart attack or stroke.

Answer:

Cholesterol is a waxy substance found in your blood. Your body needs cholesterol to build healthy cells, but high levels of cholesterol can increase your risk of heart disease.

With high cholesterol, you can develop fatty deposits in your blood vessels. Eventually, these deposits grow, making it difficult for enough blood to flow through your arteries. Sometimes, those deposits can break suddenly and form a clot that causes a heart attack or stroke.

Explanation:

High cholesterol can cause a dangerous accumulation of cholesterol and other deposits on the walls of your arteries (atherosclerosis). These deposits (plaques) can reduce blood flow through your arteries, which can cause complications, such as:

Chest pain. If the arteries that supply your heart with blood (coronary arteries) are affected, you might have chest pain (angina) and other symptoms of coronary artery disease.

Heart attack. If plaques tear or rupture, a blood clot can form at the plaque-rupture site — blocking the flow of blood or breaking free and plugging an artery downstream. If blood flow to part of your heart stops, you'll have a heart attack.

Stroke. Similar to a heart attack, a stroke occurs when a blood clot blocks blood flow to part of your brain.

50 POINTS
Which will reduce the possible environmental damage associated with mining uranium?

A. installing newer water recycling systems in older power plants
B. increasing the reprocessing of used fuel for reuse
C. building additional fission nuclear power plants
D. developing better places to store radioactive wastes

Answers

My guess is b for the question

Please Help Me. Thank You!!!
Molten aluminium is formed at the ____________ electrode where positive Al3+ ions are reduced to aluminium ions. The liquid aluminium runs to the bottom of the cell, where it is tapped off.

Answers

Explanation:

this is you questions answered

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