What happens to mass and energy in a closed system?
A. Only energy can enter or exit a closed system.
B. Neither energy nor mass can enter or exit a closed system.
C. Only mass can enter or exit a closed system.
D. Both energy and mass can enter or exit a closed system.

Answer: 1.2544

Explanation:

if you look at the number 1 and 1 are the go to the next number 4 and 2 aren't so 1.44 is bigger while 1.2544 is smaller.

Answer:

1.2544

Explanation:

Answer:

D, took the test

Explanation:

Answer:

D: To show how using a list of examples can strengthen a claim

Hope this helps! <3

Answer:

where is the question

Explanation:

pls. send it

Answer:

A

Explanation:

it's Conventional Movement

Answer:

9

Explanation:

i think i dont know

maybe someone tell me if I'm wrong

Answer:

Use Boyles law.

Given:

P1=3atm

V1=275mL

P2=1.8atm

V2=?

P1V1=P2V2

3x275=1.8xV2

V2=3x275/1.8

V2=458.3mL

Answer: I think the alcohol molecules slip between the water molecules and take up that space, so you have less that you started with.

Explanation:

Answer:

Explanation:

Let's break it down:

We can now draw the structure of  2,2-dimethyl butane​ using the following steps:

Answer:

Asteroid belt

Explanation:

Answer:

asteriod belt i think?

Explanation:

sorry if im wrong but Jupiter does pass pretty close to the asteroid belt

Brainliest?

Answer:

absolutely correct....................

Answer:

whatttttttttttttttttttttttt

Answer:

Breaking glass - chemical change

popsicle - physical

milk - chemical

bread - physical

roasting - chemical

egg - chemical

fireworks - chemical

mixing something with water - chemical

popcorn - chemical

colouring hair - physical

melting chocolate - physical

crumpled paper - physical

rusted nails - chemical

crushed can - physical

cooked egg - chemical

bending metal - physical

melting ice - physical

bleaching clothes - chemical

If u want to differentiate between chemcial and physical change u need to remember this-

physical change - no new substance is formed (Even for melting of ice it's still water) and it can be reversible, except for some cases like tearing of paper

chemical change - a new substance is formed

Answer:

The answer would be the hawk.

Explanation:

First-order consumers directly depends on grass or plants for survival.

A hawk gets its food from eating animals.

Again, hope this helps :D

Answer:

3 electrons

Explanation:

For every proton there is an electron.

Answer:

3 electrons

Explanation:

atoms are neutral in electrical charge because they have the same number of electrons as protons.

The mass of ammonia that would be produced is 312.5 g

First, we will write a balanced chemical equation for the reaction

The balanced chemical equation for the reaction is

3H₂(g) + N₂(g) → 2NH₃(g)

This means

3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia.

First, we will determine the number of moles of each reactant present

For Hydrogen (H₂)

Mass = 83.6 g

Molar mass = 2.016 g/mol

Using the formula

[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]

Number of moles of H₂ present = [tex]\frac{83.6}{2.016}[/tex]

∴ Number of moles of H₂ present = 41.468254 moles

For Nitrogen (N₂)

Mass = 257 grams

Molar mass = 28.0134 g/mol

∴ Number of moles of N₂ present = [tex]\frac{257}{28.0134}[/tex]

Number of moles of N₂ present = 9.174181 moles

Since,

3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia

Then,

27.522543 moles of hydrogen gas will react with the 9.174181 moles of nitrogen gas to produce 18.348362 moles of ammonia

∴ 18.348362 moles of ammonia will be produced during the reaction

Now, for the mass of ammonia that would be produced

From the formula

Mass = Number of moles × Molar mass

Molar mass of ammonia = 17.031 g/mol

Mass of ammonia that would be produced = 18.348362 × 17.031

Mass of ammonia that would be produced = 312.49095 g

Mass of ammonia that would be produced ≅ 312.5 g

Hence, the mass of ammonia that would be produced is 312.5 g

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Answer:

Explanation:

Balance the reaction of Al + HCl = AlCl3 + H2 using this chemical equation balancer!

Answer:

Chromatography involves solvent separation on a solid medium. Distillation takes advantage of differences in boiling points. Evaporation removes a liquid from a solution to leave a solid material. Filtration separates solids of different sizes.

Explanation:

give brainliest

Measles is a communicable disease that requires immunization to prevent illness when exposed to it.

Measles is a communicable disease and highly contagious. It  is usually very serious in children. The disease can be contacted through droplets in the air, physical contact and through mother-to-child transmission.

It is a very serious disease as it is caused by a virus which replicates very fast in the throat and nose thereby creating symptoms such as runny nose, coughing, sneezing and is usually accompanied with a rash.

The severity and death rates is what gave rise to the creating of a measles vaccine which is usually given to babies after birth to make them immune to the potential exposure to the virus.

Diabetes, bronchitis and strep throat have no vaccine as they can always be treated or managed with over-the-counter drugs.

Read more on https://brainly.com/question/25249487

Answer:

Mark me brianliest plzzzzzzzzzzzz (puppy eyes) plz

Explanation:

22,400 Kelvin

22,400 KelvinSpica A and B are both classified as B-type stars and are very hot, with surface temperatures of 22,400 Kelvin and 18,500 Kelvin respectively. The primary component has a luminosity of some 12,100 Suns while the secondary shines with the power of 1500 Suns.

Answer:B

Explanation:

A positively charged object attracts an uncharged object.

A positively charged object attracts an uncharged object statement is in correct in the table. Hence option B is correct.

Charge are defined as a subatomic particle's ability to experience force when exposed to an electric and magnetic field. The value that the atom reaches after removing or gaining electrons is known as charge. Only ions that comply with the octat rule are stable. Atoms or groups of atoms with an electric charge are referred to as ions. Cations are positive-charged ion particles. Anions are ion types that have a net negative charge.

A charged object will cause an opposing charge to be applied to an uncharged object when it is brought close to the charged one. These two things are drawn to one another because opposing charges attract one another. Other charged items are drawn to a charged object whereas uncharged objects are repelled by it.

Thus, a positively charged object attracts an uncharged object statement is in correct in the table. Hence option B is correct.

To learn more about charge, refer to the link below:

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[tex]\sf{Acid}+\bf{Base}\longrightarrow \tt{Salt}+\bold{Water }[/tex]

These type of reaction is called as Neutralization Reaction.

Answer:

Liquid water is held together by hydrogen bonds. Oils and fats not have any polar part and so for them to dissolve in water they would have to break some of water s hydrogen bonds.Water will not do this so the oil is forced to stay separate from the water.

Oil are the lipid molecule do not Mix With Water Because of Polarity. Oil and water don’t mix as it  is made up of non-polar molecules while water molecules are polar.

Lipids are organic biomolecule made up of carbon, hydrogen and oxygen with some other elements like phosphorus and nitrogen may be present.

A fatty acid which is an organic acid having hydrogen and general formula R-COOH where R represents hydrogen or a group of carbon and hydrogen atoms, for example stearic, palmitic and oleic acids.

Glycerol is another component which is a thick sweetish liquid, soluble in water and  can react with a fatty acid. where one molecule of glycerol combines with three molecule is fatty acids by formation of a bond called ester, here ester is also known as triglyceride.

To learn more about lipid , refer to the link:

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Answer:

nnhnhgnklhnhmkghklmfmg

Explanation:

cvgngh kcvl vl gkh kn hg

Answer:

Answer:

nCaCO3 = 20/100 = 0,2 mol

CaCO3 --> CaO + CO2

0,2 ----------------> 0,2

nNaOH = 0,5.0,56 = 0,28 mol

=> T = nNaOH/nCO2 = 0,28/0,2 = 1,4

=> sản phẩm tạo ra bao gồm : Na2CO3 và NaHCO3

NaOH + CO2 --> NaHCO3

x -------> x --------> x

2NaOH + CO2 --> Na2CO3 + H2O

y ---------> 1/2y ---> 1/2y

ta có : nCO2 = nMuối = 0,2 mol

=> CmMuối = 0,2/0,5 = 0,4 M

Answer:

Explanation:

An Observation

Answer:

These are the elements or compounds that enter into a chemical reaction: Reactants

These are the substance(s) formed in a chemical reaction: Products

These are the reactants in the chemical equation C6H1206 +602 --> 6CO2 + 6H20: C6H1206 and 602

These are the reactants in the chemical equation 6 CO2 + 6H2O --> C6H1206 + 6 02: 6 CO2 + 6H2O

These are the reactants in the chemical equation 2 H2 + 02 --> 2 H2O: 2H2 and O2

These are the reactants in the chemical equation 2 H2O --> 2 H2 + O2: 2H2O

Answer:

8m/min

Explanation:

120 m / 15 min = 8 meters per min