Which statement best describes a physical change?

Answers

Answer 1

Explanation:

A physical change is one which can be reversed.it also does not produce any new substance.

changes in state such as the melting of a solid, the freezing and vaporization of a liquid as well as changes In shape are examples of physical changes


Related Questions

Atoms and the chemical bonds that connect them cannot be observed with your eyes, so it is necessary to use a
a. microscope
b. theory
c. model
d. both (b) and (c)

Answers

Answer: d. both (b) and (c)

Explanation:

Atoms are too small to be seen on microscopes, so we model them based on theories.

It is d
Ddddddddddddddddddddddddddddddddddddd

What does a standard enthalpy change mean?

Answers

Standard enthalpy change refers to a change in the amount of energy in a reaction that occurs under standard conditions.

What is standard enthalpy change?

It is a property that measures the change in the amount of energy in a reaction involving the formation of substances from pure elements.

Such a reaction must happen under standard conditions which include 1-atmosphere pressure and 298.15 K temperature.

It is designated by  ΔH°.

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hydrochloride acid +_________ zinc chloride +hydrogen​

Answers

Answer:

Hydrochloride acid + Zinc = Zinc Chloride + Hydrogen

Explanation:

When Hydrochloride acid and Zinc react, it results in the formation of Zinc chloride and hydrogen.

Hope I helped

What is lawn sand made up of and clay don’t copy straight off Cuz I can’t write the same thing it has

Answers

Answer:

?? what i dont understand

How many atoms are present in 2.1 moles of Fe

Answers

Answer:

1.3 x 10²⁴ atoms Fe

Explanation:

To convert moles to atoms, you need to multiply your given value by Avogadro's Number. This causes the conversion to occur because Avogadro's Number exists as a ratio. It is the ratio that allows for the cancellation of units during multiplication. This is why atoms should be in the numerator of your conversion. The final answer should have 2 sig figs to reflect the given value.

Avogadro's Number:

1 mole = 6.022 x 10²³ atoms

2.1 moles Fe          6.022 x 10²³ atoms
---------------------  x  -------------------------------  =  1.3 x 10²⁴ atoms Fe
                                        1 mole

0.467 mol NaCl are needed to
create a 0.875 m solution using 534
g of water. How many grams of
sodium chloride are required to
make the solution?

Answers

The mass, in grams, of sodium chloride needed would be 27.29 grams.

Number of moles

The number of moles of a substance is mathematically given as:

Mole = mass/molar mass.

Thus, mass = mole x molar mass.

In this case, 0.467 moles of NaCl is needed. The mass of 0.467 moles of NaCl can then be calculated as:

Mass = 0.467 x 58.44 = 27.29 grams.

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CaCO3(s) CaO(s) + CO₂(g)
4
3.25 mol CaCO3 decomposes
according to the reaction above.
What volume of CO2 gas is
produced once the gas cools to
STP?

Answers

Try 22.4 and see if that works

can a chemical reaction take place without enzyme​

Answers

Answer:

Theoretically, Yes (See the explanation)

Explanation:

The body has enzymes that catalyze processes, as several other respondents have mentioned. I haven't noticed any comments, but the reverse impact might be just as significant. Some enzymes are reaction inhibitors. Others operate as both catalysts and inhibitors, depending on the amounts of the reactants and reaction products close to the catalyst. I'll provide an illustration to demonstrate how crucial inhibition may be. Let's say you consume three banana splits one after the other. That is a large number of calories. You would have a very high temperature and be so energetic and full of energy that you would be bouncing off the walls if all those calories were converted simultaneously into energy and heat. But neither you nor I have ever heard of overeating creating a high temperature or anxiety. This is due to the fact that many of the high energy molecules produced by the process hinder the enzymes that regulate metabolism, which produces the energy needed to power your body and generate heat. In other words, if you don't require high energy, your body won't keep making it. When there are huge amounts of carbohydrates around, the enzymes that turn the carbohydrates you consumed into glycogen and fat (to store the extra energy you don't need right now) become catalytic (mostly glucose). Therefore, the /majority of the energy from those three banana splits will be stored as fat and glycogen as it won't be needed. And that occurs as a result of the reaction to turn the sugars into energy being blocked by the lack of a demand for the energy at the time. Both enzymes that act as catalysts and those that act as inhibitors are essential to the healthy operation of our bodies.

________________________________________________________

Definitions:

Enzymes: Any of various proteins, as pepsin, originating from living cells and capable of producing certain chemical changes in organic substances by catalytic action, as in digestion.

Metabolism: The sum of physical and chemical processes in an organism by which its material substance is produced, maintained, and destroyed, and by which energy is made available.

Glucose: A sugar, C6H12O6, having several optically different forms, the common dextrorotatory form (dextroglucose, or -glucose) occurring in many fruits , animal tissues and fluids, etc., and having a sweetness about one half that of ordinary sugar, and the rare levorotary form (lavoglucose, or -glucose) not naturally occurring.

Chemical reaction: Reaction, the reciprocal action of chemical agents upon each other; chemical change.

Protein: Any of numerous, highly varied organic molecules constituting a large portion of the mass of every life form and necessary in the diet of all animals and other nonphotosynthesizing organisms, composed of 20 or more amino acids linked in a genetically controlled linear sequence into one or more long polypeptide chains, the final shape and other properties of each protein being determined by the side chains of the amino acids and there chemical attachments: proteins include such specialized forms as collagen for supportive tissue, hemoglobin for transport, antibodies for immune defense, and enzymes for metabolism.

Amino acids: Any of a class of organic compounds that contains at least one amino group, -NH2, and one carboxyl, -COOH: the alpha-amino acids, RCH(NH2)COOH, are the building blocks from which proteins are constructed.

Answer:

Chemical reactions would slow down and even not proceed at all without enzymes.

Explanation:

Enzymes are protein catalysts, meaning they speed up chemical...

How to convert °c 40 to °f

Answers

Answer:

104 f

Explanation:

multiply 40 by 1.8 and then add 32

You might also want to challenge other commonly accepted green ideas or the impact of the various green activities . For example , what is the relative impact of these green measures ? What mass of carbon do these various common activities use up ?

1. Washing clothes at 300 degrees instead of 400 .
2. Shutting your computer down every night .
3. Using low - energy light bulbs instead of regular light bulbs ..
4. Switching off television instead of leaving it on standby .
5. Boiling only 1 cup of water at a time , instead of a whole kettle .​

Answers

2)A complete desktop uses an average of 200 Watt hours (Wh). This is the sum of the average consumption per hour of the computer itself (171 W), the internet modem (10 W), the printer (5 W) and the loudspeakers (20 W). Assuming that a computer is on for eight hours a day, the annual consumption comes to 600 kWh. That corresponds to CO2 emissions of about 175 kg per year, i.e. 1.75 % of the average annual emission of a Belgian.

What is the mass percent of Fe in iron(II) chloride

Answers

its

28.090%
hope its helpful >~

What happens is the PH changes

Answers

The changes in different properties such as concentration etc will change if the pH experiences a change.

What is pH?

This is referred to the power of hydrogen and is a measure of the degree of acidity or alkalinity of a substance.

When pH changes, the concentration as well as other properties in this context.

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6.0 mol NaOH reacts with
9.0 mol H3PO4 according to
the equation below:
3NaOH + H3PO4 → 3H₂O + Na3PO4
How many moles of Na3PO4 form from
9.0 mol H3PO4?
[?] mol Na3PO4
Round your answer to the tenths place.

Answers

Taking into account the reaction stoichiometry, 2 moles of Na₃PO₄ can be produced when 6.0 mol NaOH reacts with 9.0 mol H₃PO₄.

Reaction stoichiometry

In first place, the balanced reaction is:

3 NaOH + H₃PO₄ → 3 H₂O + Na₃PO₄

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

NaOH: 3 moles H₃PO₄: 1 mole H₂O: 3 molesNa₃PO₄: 1 mole

Limiting reagent

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

Limiting reagent in this case

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 1 mole of H₃PO₄ reacts with 3 moles of NaOH, 9 moles of H₃PO₄ reacts with how many moles of NaOH?

[tex]moles of NaOH=\frac{9 moles of H_{3} PO_{4} x3 moles of NaOH}{1 mole of H_{3} PO_{4}}[/tex]

moles of NaOH= 27 moles

But 27 moles of NaOH are not available, 6 moles are available. Since you have less moles than you need to react with 9 moles of H₃PO₄, NaOH will be the limiting reagent.

Moles of Na₃PO₄ formed

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 3 moles of NaOH form 1 mole of Na₃PO₄, 6 moles of NaOH form how many moles of Na₃PO₄?

[tex]moles of Na_{3}P O_{4} =\frac{6 moles of NaOHx1 mole of Na_{3}P O_{4} }{3 moles of NaOH}[/tex]

moles of Na₃PO₄= 2 moles

Then, 2 moles of Na₃PO₄ can be produced when 6.0 mol NaOH reacts with 9.0 mol H₃PO₄.

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Answer:

The first one is 2 but the second one is 9

Explanation:

how many atoms of of titanium are present in a sample containing 0.375 moles Ti

Answers

2.258302785 x [tex]10^{23}[/tex] atoms of titanium are present in a sample containing 0.375 moles of Ti.

What are moles?

A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

To find the number atoms we need to multiply by 6.02214076 × 10^{23}.

0.375 moles x  6.02214076 × [tex]10^{23}[/tex]

2.258302785 x [tex]10^{23}[/tex]

Hence, 2.258302785 x [tex]10^{23}[/tex] atoms of titanium are present in a sample containing 0.375 moles of Ti.

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An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?
O the neutron and the electron
O the proton and the electron
O the proton and the neutron
O the neutron and the atom

Answers

Answer:

the pro on and the electron

The proton and electron

if the temperature of this equilibrium was increased, what would happen to the equilibrium yield of chlorine?

Answers

Answer:

the temperature of the system decreases

Can someone help me please

Answers

Answer:

4) x = 4

Explanation:

Using Intersecting Chords Theorem,

AB × CB = BE × BD

( 4x + 2) × 8 = 9 × ( 4x ) 32x + 16 = 36x16 = 36x -32x (Subtract)16 = 4x (Divide both sides by 4)x = 16/ 4 (Divide)x = 4--------------------------

A 10.0 ml portion of 0.010 m hcl is diluted by adding it to100.0 ml of water. what is the ph of the solution

Answers

From the calculation, the pH of the solution after dilution is 3.

What is the pH?

The pH is the hydrogen ion concentration of the solution. Now we know that;

C1 =  0.010 m

V1 = 10.0 ml

V2 = 10.0 ml + 100.0 ml = 110 ml

C2 = ?

C1V1 = C2V2

C2 = C1V1 /V2

C2 =  0.010 m  * 10.0 ml / 110 ml

C2 = 0.00091 M

pH = -log[0.00091 M]

pH = 3

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Practice question 1 How many moles are in 5.64e25 atoms of iron (Fe)?​

Answers

1 mole is equal to 6.0220 x 1023 atoms of any element.

The atomic mass unit is presently based on assigning an exact integral mass (in amu) to an isotope of an hydrogen oxygen sodium carbon helium
a. hydrogen

b. oxygen

c. sodium

d. carbon

e. helium

Answers

Answer: a. hydrogen

This is a fact.

Carbon is the reference taken to assign the atomic mass unit

One twelfth of the mass of unbound carbon-12 is taken as 1amuThe unit for the atomic mass constant is Dalton (Da)This unit is standard when doing calculations in chemistry and physics1amu = 1.6605x10⁻¹⁹gThis was also derived from the law of definite proportionsThis standard has been set by the International Union of Pure and Applied Chemistry (IUPAC)The IUPAC is responsible for assigning various standards such as the nomenclature of various compounds, and updating the periodic table of elements.According to the IUPAC carbon is the reference taken to assign the atomic mass unit

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Drag each tile to the correct location.

Classify the reactions as endothermic or exothermic.

The reaction between
ammonium nitrate and
water absorbs heat
from the surrounding
environment.
Three drops of concentrated
sulfuric acid added to 100
milliliters of water in a beaker
makes the beaker hot.
Ammonium chloride dissolved
in a beaker of water makes the
beaker cold.
Uranium atoms are split to
produce nuclear energy.
Water separates into
hydrogen and oxygen
when an electric current
is run through it.
Methane and oxygen are
combined to produce
methanol and heat.
Reset Next
Post Test: Chemical Reactions
© 2022 Edmentum. All rights reserved.

Answers

First and fifth reaction shows endothermic reaction while the rest of it shows exothermic reaction.

What reaction shows exothermic and endothermic reaction?

The reaction between ammonium nitrate and water is an example of endothermic reaction because it absorbs heat from the surrounding environment.

Three drops of concentrated sulfuric acid added to 100 milliliters of water in a beaker makes the beaker hot because exothermic reaction occur.

Ammonium chloride dissolved in a beaker of water makes the beaker cold which shows that it is exothermic reaction because heat leaves the solution.

Uranium atoms are split to produce nuclear energy is an example of exothermic reaction.

Water separates into hydrogen and oxygen when an electric current is run through it that shows endothermic reaction.

Methane and oxygen are combined to produce methanol and heat is an example of exothermic reaction.

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6.0 mol NaOH reacts with
9.0 mol H3PO4 according to
the equation below:
3NaOH + H3PO4 → 3H₂O + Na3PO4
How many moles of Na3PO4 form from
6.0 mol NaOH?
[?] mol Na3PO4
Round your answer to the tenths place.

Answers

2 moles of Na3PO4 form from 6.0 mol NaOH. Details about stoichiometry can be found below.

How to calculate number of moles?

The number of moles of a substance can be calculated stoichiometrically as follows:

3NaOH + H3PO4 → 3H₂O + Na3PO4

According to this equation,

3 moles of NaOH produces 1 mole of Na3PO4

This means that 6 moles of NaOH will produce 6/3 = 2 moles of Na3PO4

Therefore, 2 moles of Na3PO4 form from 6.0 mol NaOH.

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which experimental technique was most likely used by the students to determine the rate of reaction?

Answers

The students can determine the rate of reaction by measuring change in concentration of reactant or product with time.

What is rate of reaction?

The rate of a reaction is the rate at which reactant molecules are used up or the rate at which product molecules are formed.

The rate of a reaction can be determined by measuring the change in concentration of the reactant at each given time in a reaction.

The rate of reaction can be also be determined by measuring the change in concentration of the product at each given time in a reaction.

Therefore, the students can determine the rate of reaction by measuring change in concentration of reactant or product with time.

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What is the complete ionic equation for NaOH(aq) + HCl(aq) → H₂O()) + NaCl(aq)?

Answers

Answer:

OH-(aq)+H+(aq)->H2O(l)

Answer is shown in photo.

Explanation :

APEX

What temperature, in Kelvin, does a 1.00 gram sample of Ne in a 2.50 L container need to be adjusted to in order to bring the pressure to 1.00 atm? Report your answer to the nearest Kelvin. (Moodle is looking for a number only, no units.)

Answers

The temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.

How to calculate temperature?

The temperature of a given gas can be calculated using the ideal gas law equation:

PV = nRT

Where;

P = pressure = 1.00 atm

V = volume =2.50 L

R = gas law constant = 0.0821 Latm/molK

Mass =1.00 gram

The molar mass of Ne= 20.1797 u

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

[tex]Moles = \frac{1.00}{20.1797}[/tex]

Moles = 0.049mol

T = temperature=?

Putting the value in the equation:

PV = nRT

1.00 atm × 2.50 L = 0.049mol × 0.0821 × T

T = 621.44K

Therefore, the temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.

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How a reaction between colorless substances can produce a colored precipitate

Answers

A reaction between colorless substances can produce a colored precipitate by formation of new ionic compound.

What is an ionic compound?

An ionic compound is a compound that is made up of two elements, one metal and the other non metal, which are held together by an ionic bonding.

When reaction occurs between two colourless substances, colored precipitate results by formation of new ionic compound.

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what is the simplest formula of a compound with 4.433g phosphorus and 5.717g oxygen?​

Answers

Answer:

empirical formula is the simplest formula of a compound with 4.433g phosphorus and 5.717g ooxygen.

what are the benefits of organic farming​

Answers

it reduces pesticides and recycles waste back into the farm

An arrow is fired at a target on a high wall. How does the energy change between the moment the arrow is fired and the moment it hits the target?

o The potential energy and kinetic energy remain the same.
o The potential energy decreases as kinetic energy increases.
o The kinetic energy decreases as potential energy increases.
o The kinetic energy remains at zero, but potential energy increases.

Answers

The kinetic energy decreases as potential energy increases. Hence, option C is correct.

What is potential energy?

Potential energy is stored energy that depends upon the relative position of various parts of a system.

As the target is fired high on the wall, the change in the energy that is observed as the arrow moves toward the target is kinetic energy starts to decrease as the arrow reaches nearer to the target and the potential energy is observed to increase.

So, in short, the energy transformation is from kinetic energy from a moving arrow to potential energy when the arrow hits the target.

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A solution is 0.225M Na2SO4. What is the molarity of the sodium ion in solution

Answers

The molarity of the sodium ion in the solution is 0.450 M.

How do we determine the molarity of sodium ions in a solution?

The molarity of the sodium ion in a solution can be determined by the dissociation of the given solution Na2SO4(sodium sulfate).

The dissociation of Na2SO4 is computed as follows:

1 mole of Na2SO4 dissociates to give 2 moles of sodium cations and 1 mole of sulfate anion.

i.e.

[tex]\mathbf{Na_2SO_4 \to 2Na^{+} + SO_4^{2-}}[/tex]

The molarity for sodium-ion [Na+] is:

= 2 × 0.225 M

= 0.450 M

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please help 8 points each but beware if you use my points for no reason I'll report you A media personality argues that global temperatures are not rising, because every year an increase is reported, such as 0.09 degrees C. The difference from the previous year is less than the margin of error of about 0.13 degrees C, so that difference should be ignored. What is the best counterargument?The difference is only 0.04, but that is still a significant change.The margin of error is quite small compared to the change year over year, so it is a significant issue. The change of 0.09 is not a lot and thus should be ignored.The margin of error is larger than the increase, so we should consider it an issue of just extra information and thus can be ignored. There are 10 USB drives in a box and 3 are defective. Two drives are to be selected, one after the other. What is the probability of selecting a defective USB followed by another defective USB? Read the sentence.The person on trial for theft was found guilty by a jury, and once a jury announces a verdict, that decision is final.Which word in the sentence is the best clue to defining the word verdict?theftguiltyjurydecision Jack has recently increased his consumption of whole grains and has just purchased a high-fiber cereal to eat for breakfast each morning, unlike the high-sugar cereal he used to eat. Jack is currently at which stage of behavior change Performing 4 weeks of stabilization training before moving on to strength endurance training for another 4 weeks would be an example of what kind of periodization Mai bought a wedge with a central angle of 45 degrees and radius 10 centimeters. what is the area of the top surface of this wedge? , 1 of 2. select choice square centimeters What did FDR mean when he said the US must become the Great arsenal of democracy Question 9 of 10What is a limitation of first-person narration in a story?A. The thoughts of too many characters are displayed.O B. The reader is too far removed from the story's action.OC. The reader does not feel a connection to the narrator.D. The other characters' views and thoughts are left out. 5 Explica hasta qu punto la lengua que una persona habla determinala manera en que ve el mundo. Proporciona ejemplos. Only animals have prokartyotic cells:TrueFalse What is the main purpose of the list of grievances included in the Declaration of Independence? Which function of the cell cycle is especially important to burn victims? growth of existing cells repair of existing cells protection of new cells reproduction of new cells Which graph represents the functionthere are 2 more graphs but it won't add it Which graph is an example of a function whose parent function is y = StartRoot x EndRoot?On a coordinate plane, a curve starts at (negative 1, negative 1) and then curves up and to the right into quadrant 1.On a coordinate plane, a parabola has a vertex at (0, 1).On a coordinate plane, 2 curves are shown. Both curves have an asymptote at x = negative 1. One curved decreases from quadrant 2 into quadrant 1 and approaches y = 1. It crosses the y-axis at (0, 2). The other curve approaches y = 1 in quadrant 1 and then curves down and approaches y = negative 1 in quadrant 3. It crosses the x-axis at (negative 2, 0).On a coordinate plane, a curve starts in quadrant 3 and then increases into quadrant 1. It crosses the y-axis at (0, negative 2) and crosses the x-axis at (1.5, 0). How many moles of na2so4 are present in 284.078 grams of na2so4? a. 2 b. 3 c. 5 d. 6 Can you please help meee neeeed helppp asapp She last drove a car three years ago .since she _____ an accident , she _____ a car for three years a person with head injury of still suffers from memory loss why