3
Which statement describes the law of conservation of energy?
O All systems will exchange matter and energy with their surroundings.
O All systems can exchange energy, but not matter, with their surroundings.
Energy cannot be created nor destroyed, but it changes from one form to another.
O Energy is destroyed in most chemical reactions when new products are formed.

Answers

Answer 1

Energy cannot be created nor destroyed, but it changes from one form to another. Hence, option C is correct.

What is energy?

Energy is the ability to do work.

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.

This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.

Hence, option C is correct.

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Related Questions

During the distillation nitrogen gas is obtained first, then argon and oxygen. What can u say about the boiling points of these three gases?

Answers

Explanation:

The boiling point of liquid nitrogen, liquid argon, and liquid oxygen are -196°C, -186°C, and -183°C respectively. So, the correct order is nitrogen, argon, oxygen.

Nitrogen:

Since you don't want nitrogen to be condensing everywhere when it gets cold out, elemental nitrogen's boiling point is luckily below zero degrees Celsius. Thank goodness for nitrogen's extremely low boiling point. If it were at zero, boiling water would not produce a lot of heat, necessitating the use of a pressure cooker to prepare foods that typically call for boiling water. Additionally, since the air would be substantially enhanced with oxygen, items may catch fire more quickly (i.e. your home might burst in flame that much more easily). An ugly picture, to be sure.

Argon:

As nonpolar gases, Ar, F2, and Cl2 only display London Dispersion Forces (LDF). These largely negligible forces, which are the product of transient dipoles, must be resisted throughout the boiling process. Since bigger atoms and molecules have valence electrons further from their nucleus, LDF intensity is also directly correlated with atomic or molecular size. Compared to smaller atoms or molecules, these outermost electrons are less attracted to the positive nucleus or nuclei, making it simpler for them to create transient dipoles. As a result, the differing molar masses of each compound—Ar—39.95 g/mol, F—38.00 g/mol, and Cl—70.90 g/mol—can be used to explain the variation in boiling points.

Oxygen:

At 1 atm, oxygen would boil at -183 degrees Celsius if it were a liquid. Although the phase diagram for oxygen is more intricate than this, it is a general phase diagram. Imagine that the term "vaporization" is at the same height as 1 atm, which is roughly halfway up the y-axis. If the y value at that time was equal to 1 atm, the "vaporization" arrow to the right would be directly above -183 degrees Celsius. It's crucial to remember that pressure determines what temperature a substance will boil, melt, condense, or freeze, as you can probably guess. Additionally, the pressure in particular circumstances can affect what phase a material is in.

Which chemical name is correctly paired with the chemical formula?
tin(IV) bromide, SnBr4
aluminum fluorate, AlF3
iron(II) oxide, Fe2O3
potassium chloride, K2Cl2

Answers

Answer:

Tin bromine = Snbr2

aluminum fluorate = AlFe3

iron oxide = Fe2o3

potassium chloride = KCL or 2KCL = K2CL2

All Pairs are correct

Explain why the Group 1 metals react vigorously with water.

Answers

The metals want to have a full outer electron shell, which involves them losing their one outer electron. Therefore, they react vigorously since they have a large desire to remove the electron.

What is the weighted average of a
bean in the sample data given?
Sample Number
of Beans
Black
Eyed Peas
Cannellini
Beans
410
90
Abundance Mass
(%)
(g)
1.32
82
18
2.94
Weighted
Average (g)
[?]

Answers

Answer: 1.6116

Explanation:

[tex](1.32)(0.82)+(2.94)(0.18)=\boxed{1.6116}[/tex]

The weighted average of a bean in the given sample data is equal to 1.6116 g.

What is the Weighted Average?

The weighted average can be described as a calculation that takes into account the varying degrees of importance of the numbers in a data set. Each number is multiplied by a predetermined weight in the given data set before the final calculation is made in calculating a weighted average.

A weighted average assigns weights that calculate in advance the relative abundance of each data point. A weighted average is commonly determined to equalize the frequency of the values in a data set.

Given the abundance of Black eyes peas, m₁ = 82% = 0.82

The mass of the Black eyes peas, W₁ = 1.32 g

the abundance of cannellini beans, m₂ = 18% 0.18

The mass of cannellini beans, W₂ = 2.94 g

The weighted average = m₁W₁ + m₂W₂ = 1.32× 0.82 + 2.94 ×0.18

The weighted average of a bean = 1.6116 g

Therefore, the weighted average of a bean in the sample is 1.6116 g.

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DESPERATE NEED OF HELP

Answers

Answer:

the answer will be false.

Explanation:

because it is not balanced.

yo i think it is balanced - i did this graph to demonstrate it

The expression caco3 → cao co2 is an example of a reactant. product. chemical equation. chemical progression.

Answers

Chemical equation

What is a chemical equation?The reactants and products of a chemical reaction are represented symbolically in a chemical equation by the appropriate chemical formulas.A chemical equation that illustrates how Calcium oxide (quicklime) and carbon dioxide are produced during the breakdown of limestone.

       CaCo3 → CaO+ CO2      (Decomposition reaction)

The portion of the chemical equation on the reactant side is to the left of the symbol "→," and the portion on the product side is to the right of the arrow symbol.Decomposition reaction:-

A chemical reaction that results in the breakdown of one reactant into two or more products is known as a decomposition reaction.

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Answer:

chemical equation

Explanation:

the hemiacetal below is treated with 18o-labeled methanol (ch3o*h) and acid. where will the label appear in the products?

Answers

The label appears in the organic product and not in the water owing to the fact that water is eliminated as -OCH3 replaces -OH.

What is a labeled reaction?

Isotopic labelling is one of the methods by which a chemical reaction is studied. In this case, we can see that the reaction occurs with the hemiacetal reacting with a labeled methanol.

By looking at the reaction products we can see that the label appears in the organic product and not in the water owing to the fact that water is eliminated as -OCH3 replaces -OH.

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A student was given a mixture of iron of iron fillings and sulphur. He was told to heat it and observe the compound.
(a) What is coloured formed.
(b) Write the effect of magnet on it.
(c) Write the action of carbon disulphide on it.
(d) Describe the effect of adding dilute hydrochloric acid to it. ldentify the gas and write its two properties.​

Answers

The observations are as follows:

black iron sulfide is formed iron sulfide is not magnetic No reaction observed with carbon sulfidehydrogen gas is evolved What is the product of the reaction of iron fillings and sulfur when heated?

When a mixture of iron fillings and sulfur are heated, black iron (ii) sulfide is formed.

Unlike iron fillings, black iron (ii) sulfide is not attracted to a magnet.

When carbon sulfide is added to it, no visible reaction is observed.

When dilute hydrochloric acid is added to it, a gas with a rotten-egg smell is evolved.

The gas is hydrogen sulfide which is a reducing agents and acidic in nature.

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the volume of a 300 L sample of CO2(g) at 2.30 atm is compressed to 29.6 L, what
is the new pressure at constant temperature and moles?

Answers

Answer:

23,31 atm

Explanation:

p1v1 = p2v2

2.3 * 300  = p2 *29.6

p2=23.31 atm

What is the pH of a solution with a
POH of 8.35?

Answers

Answer: The pH of the solution is 5.65

Explanation:

The relationship between the pH and the pOH is that [tex]pH+pOH=14[/tex].

Given this, we can plug in the pOH and subtract that from 14.

[tex]14-pOH=pH\\14-8.35=5.65[/tex]

I hope this helped! Pls give brainliest!! :)

Answer:

Give the man above me brainliest

What kind of nuclear reaction is seen in (image)?

Answers

Answer:

Beta decay

Explanation:

A beta particle (also known as an electron) is being emitted from the nuclide.

Explain how the moon causes high and low tides.

Answers

Answer:

gravitational pull generates something called tidal force.

Explanation:

High and low tides are caused by the moon. the moons gravitational pull generates tidal force.

High and low tides are caused by the moon. The moon's gravitational pull generates something called the tidal force. The tidal force causes Earth—and its water—to bulge out on the side closest to the moon and the side farthest from the moon.

HELP FAST PLEASE! What is the limiting reactant if 43.4 g of NH3 react with 30 g of NO? The balanced equation is 4NH3 + 6NO --> 5N2 + 6H2O.


Choices:

A. H2O
B. NH3
C. NO
D. N2

Answers

The limiting reactant in the reaction is the NO molecule.

What is limiting reactant?

The limiting reactant is the reactant that is present in the least amount in the reaction. The rate of reaction depends on the limiting reactant.

Given the reaction; 4NH3 + 6NO --> 5N2 + 6H2O.

Number of moles of NH3 = 43.4 g/17 g/mol = 2.55 moles

Number of moles of NO = 30 g/30 g/mol = 1 mole

Now if 4 moles of NH3 reacts with 6 moles of NO

2.55 moles of NH3 reacts with 2.55 moles * 6 moles/ 4 moles

= 3.8 moles

Hence, the limiting reactant in this reaction is NO.

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Please help, need it for homework

Answers

Answer:

n

Explanation:

nobody knows

3 Cu + 8HNO3 g 3 Cu(NO3)2 + 2 NO + 4 H2O

In the above equation how many moles of NO can be made when 97.00 moles of HNO3 are consumed?

Answers

24.25 moles of NO can be produced using 97 moles of HNO3.

What is balanced chemical equation?

Equal numbers of atoms from various elements are present in both the reactants and the products in balanced chemical equations. Varied elements' atom counts in the reactants and products of unbalanced chemical equations are different.

3 Cu + 8HNO3 g → 3 Cu(NO3)2 + 2 NO + 4 H2O

The number of moles consumed can be calculated using comparing with coefficients in the balanced reaction .

So , from above eq we get that 8 moles of HNO3 are consumed to make 2 moles of NO.

⇒  8 HNO3⇔2 NO

⇒ 1 HNO3⇔ 1/4 NO

This means that for each mole of HNO3 produces 1/4 moles of NO.

So , for 97 moles of HNO3 , [tex]\frac{1}{4} *97[/tex] moles of NO can be made,

So, total moles of NO made are 24.25 moles.

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24.25 moles of NO would be made when 97 moles of [tex]HNO_{3}[/tex] are consumed

Given reaction:

[tex]3 Cu + 8HNO_{3} - > 3 Cu(NO_{3})_{2} + 2 NO + 4 H_{2}O[/tex]

As the given reaction is already balanced so we don't need to balance it

In a balanced chemical reaction the ratio of reactants consumed and products formed always remains constant.

∵ In the given Reaction we can analyse for 8 moles [tex]HNO_{3}[/tex] consumed 2 moles of [tex]NO[/tex] are being produced.

Assuming [tex]x[/tex] moles of [tex]NO[/tex] being produced when [tex]97[/tex] moles [tex]HNO_{3[/tex] produced

∵ Ratio remains constant

⇒[tex]\frac{HNO_{3} Consumed}{NO Produced} = \frac{8}{2} =\frac{97}{x}[/tex]

⇒[tex]x=\frac{97}{4}=24.25[/tex] moles

∴ 24.25 moles of [tex]NO[/tex] would be made.

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What are the five (5) things that can indicate a chemical change has occurred?
Write out the combinations that indicate a chemical change, explain how you know.

Answers

Answer: Bubbles, burning, odor, color change, and rusting.

Explanation: Chemical changes are changes to something that is irreversible.

Chemical bonds are formed when valence electrons are:

Answers

Chemical bonds are formed when valence electrons are shared or donated.

Chemical bonds

Chemical bonds are formed between two or more atoms when electrons are transferred or shared between or among the participating atoms.

For example, ionic bonds are formed when a metal ion such as Na donates its valence electrons to a non-metallic ion such as Cl to form NaCl.

Covalent bonds are formed when participating ions shared their valence electrons to give each other octet states.

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As you know, liquid hydrazine (N2H4) can be used as a rocket fuel. A rocket you designed has a total of 1.35E5 g of hydrazine when it loses power just beyond the atmosphere of Earth. It is on the dark side of the Earth at the time, and the external temperature is 116 K. By the time you notice, the internal temperature of the rocket (and the rocket fuel) has also reached 116 K. How much heat must be applied (in J) to the fuel to warm it back to its operating temperature of 298 K

Answers

The heat required to warm the fuel back to it's operating temperature is 3.83×10⁷ J

Data obtained from the question Mass (M) = 1.35×10⁵ g = 1.35×10⁵ / 1000 = 135 KgInitial temperature (T₁) = 116 KFinal temperature (T₂) = 298 KSpecific heat capacity (C) = 1559.45 J/KgK Heat (Q) =?

How to determine the heat required

The heat required to warm the fuel can be obtained as follow:

Q = MC(T₂ – T₁)

Q = 135 × 1559.45 × (298 – 116)

Q = 135 × 1559.45 × 182

Q = 3.83×10 J

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Which phrase describes a homogeneous catalyst?

Answers

Answer:

It is in the same phase as the reactants.

Explanation:

i took the test

explain why nickel has a high density.​

Answers

Density Of A Nickel:-

8.902 (25°C)

Explanation of why does nickel have a high density:-

Nickel is the only element named after the devil. The name comes from the German word Kupfernickel, meaning "Old Nick's copper," a term used by German miners. They tried to remove copper from an ore that looked like copper ore, but they were unsuccessful. ... Nickel is also used in the manufacture of many other alloys.

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A group of students working in a chemistry lab are planning a procedure to
neutralize hydrochloric acid (HCI, strong acid). How should they BEST accomplish
this?

Answers

use a strong base to neutralize, like NaOH, KOH, etc

Help pls!!
The table compares the number of electrons in two unknown neutral atoms.
Comparison of Electrons
Atom Number of Electrons
A 10
D 11
Use this information to determine the number of valence electrons in the atoms. Which of the following correctly compares the stability of the two atoms?

A Both are unreactive.
B Both are highly reactive.
C A is unreactive and D is reactive.
D A is reactive and D is unreactive.

Answers

Answer: A is unreactive and D is reactive.

Explanation:

A is neon, which is a noble gas, and thus unreactive.

D is sodium, which is an alkali metal, and thus highly reactive.

2 NH3 + 3 CuO →3 Cu + N₂ + 3 H₂O
In the above equation, how many grams of N₂ can be made when 4.3 moles of CuO are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer
as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your
answer incorrect.:
Element Molar Mass
Hydrogen 1
Nitrogen 14
Copper 63.5
Oxygen 16

Answers

40.1g of nitrogen gas is produced.

The equation given is

2 NH₃ + 3 CuO →3 Cu + N₂ + 3 H₂O

This equation is already balanced.

When 3 moles of CuO are consumed, 1 mole of nitrogen gas is produced.

We get 1 mole of nitrogen from 3 moles of copper oxide.

We need to find the number of moles of nitrogen gas produced when 4.3 moles of copper oxide are consumed.

4.3/3 x 1 = 1.433 mols

1.433 mols of nitrogen gas are producedThe molar mass of nitrogen gas is 14+14 = 28gThe amount of nitrogen gas produced in grams is 28x1.433 = 40.1g

40.1g of nitrogen gas can be made when 4.3 moles of CuO are consumed.

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The main environmental factors that affect microorganism growth include chemical inhibitors, oxygen, pH, nutrients, moisture and...

Answers

The main environmental factors that affect microorganism growth include chemical inhibitors, oxygen, pH, nutrients, moisture and temperature.

What are micro organism?

Micro Organism are organism that can be seen with a microscope.

Microorganisms include bacteria, protozoa, algae, and fungi.

Micro organisms exist in its single-celled form or as a colony of cells.

The main environmental factors that affect microorganism growth include chemical inhibitors, oxygen, pH, nutrients, moisture and temperature.

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10. What are the four steps in the scientific method?

Answers

observation, formulation, testing hypothesis, and establishing the theory

What conditions make AG always positive?

Answers

Answer: when a reaction absorbs heat or decreases the entropy of the system,

Explanation: :)

Did you write these compounds?
KBr
2 NH₂OH
2HNO3

Answers

The missing components of the neutralisation reaction include the following:

KBr KBr 2NH4OHKBr 2NH4OH2HNO2

What is neutralisation reaction?

Neutralisation reaction is defined as the type of reaction that leads to the formation of salt and water when an acid and a base reacts.

From the reactions given the missing components are replaced as follows:

HBr + KOH --> KBr + H2O

H2SO4 + 2NH4OH --> (NH4)2SO4 + 2H2O

2HNO3 + Mg(OH)2 --> Mg(NO3)2 + 2H2O

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HELP FAST!!!!!!!
Which two groups have the same functional group?
O A. Amines and alcohols
B. Aldehydes and esters
C. Ketones and aldehydes
D. Esters and ethers

Answers

Answer:

C. Ketones and aldehydes

Explanation:

they are both carbonyl functional group

they both have a carbon-oxygen double bond

testosterone is an example of a ketone

formaldehyde is an example of a aldehyde

opentextbcca

wikipedia

Answer:

Ketones and Aldehydes

Explanation:

i just took tha test

A year has 365 day and a day has 24 hours. if an hour has 60 minutes and a minute has 60 seconds how many seconds are in a year

Answers

Answer:

31536000

Explanation:

There are 31536000 seconds in a day.

60s x 60min x 24hrs x 365 days = 31536000sec

NiSe2 + Ca3(PO4)2 = Ni3(PO4)2 + CaSe

balance please

Answers

3Ni + Sn3(PO4)2 → Ni3(PO4)2 + 3Sn I think. Not for sure though
Other Questions
How to write a two column proof for number 12? a ball is thrown upward from the ground with an initial velocity of 50m/s. what is the total time spent by the ball in the air (g=10m/s2) The function y=x-4x+8 approximates the height, y, of a bird, and its horizontal distance, x, as it flies from onefence post to another. All distances are in feet. Complete the square to find and interpret the extreme value(vertex).Select two answers: one extreme value and one interpretation.Height (feet)Distance (feet)A. When the bird is 4 feet away from the first fence post, it reaches its minimum height of 8 feet.B. Minimum at (4,8)C. When the bird is 2 feet away from the first fence post, it reaches its minimum height of 4 feet.D. Minimum at (2,4) the presence of elevated carbon dioxide levels in the blood is called: Both Pilgrims and Puritans established New World colonies to What is the setting dedicated by this What is the difference between chamber and symphony orchestras?. How do the 2 sides of the brain communicate? A patient sees her provider for spontaneous episodes of vertigo lasting 30 minutes each, fluctuating hearing loss, and tinnitus. The provider performs a hearing test and confirms hearing loss in the right ear. The provider documents the patient has Meniere's disease in the right ear. What ICD-10-CM code(s) is (are) reported Rapid weight loss during the first few days of weight due to caloric deficit occurs primarily from a loss of _________________. Nigel bought 10 pencils and 5 erasers for 8$. The price of 2pencils was 1$. What was the price of 2 erasers? Maggie and Tanya went to a fruit store. Maggie bought 10 oranges and 5 apples for $4. Tanya bought 9 oranges and 3 apples for $3. What is the cost of an orange and an apple? Jane will prioritize her tasks by completing the tasks that are most important to complete for that day. Angela will prioritize her tasks by completing the tasks that are easiest and leave the more difficult tasks for later. Who is prioritizing more efficiently?A. Neither Jane nor AngelaB. JaneC. Both Jane and AngelaD. Angela A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 12 million years. How many years ago did two species share a common ancestor if the molecules found in these two species differ by a total of six mutations?a 1.5 million yearsb 72 million yearsc 12 million yearsd 36 million years Use what you know to help you complete the sentence.Freedom of religion is guaranteed by theFirst Amendment.Second Amendment.Fourth Amendment.Fifth Amendment. Scientists want to track the wind speeds and precipitation for a hurricane that will affect the entire East Coast of the United States. Which weather equipment would be best to measure the impact of the storm for this entire region?A. an anemometerB. a rain gaugeC. Doppler RadarD. global positioning system (GPS) The angle of depression from the hot-airballoon to the car is 34.How high is the hot-air balloon flying?Give your answer to 2 s.f.6400 feetNot drawn accurately 11. Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial. Round to three decimal places. n=12, x = 5, p = 0,25 A) 0.082B) 0.091 C) 0.027D) 0.103 Given: AM||RZ , angle R is congruent to angle ZProve: angle RAM is congruent to angle ZMA in general what is the importance of reflex testing in a routine physical examination