What is an example of a physical change?

A. having less ash than the paper that was burned to form it
B. ice forming and then melting back into water
C. rust having a different identity than the iron it forms on
D. the irreversible reaction of vinegar and baking soda

What one would you guys choose?

Answers

Answer 1

Answer:

B is correct answer

Explanation:

Answer 2

Answer:

B.

Explanation:


Related Questions

Please help need ASAP!!! Due tonight,
Name the Compounds. Spelling counts
SiCl4
N2O4

Answers

Answer:

Silicon tetrachloride

Dinitrogen tetroxide

The name of the compound SiCl₄ is named silicon tetrachloride and N₂O₄ is named dinitrogen tetroxide.

SiCl₄ is named silicon tetrachloride. It is composed of one silicon atom (Si) bonded to four chlorine atoms (Cl). The prefix "tetra-" indicates the presence of four chlorine atoms bonded to the central silicon atom.

N₂O₄ is named dinitrogen tetroxide. It consists of two nitrogen atoms (N) bonded to four oxygen atoms (O). The prefix "di-" indicates the presence of two nitrogen atoms, and the suffix "-tetraoxide" indicates the presence of four oxygen atoms.

Learn more about compound here:

https://brainly.com/question/14117795

#SPJ 6

The uncertainty in the measurement 0.0035 mg is:_______ A) + 0.1 mg B) + 0.01 mg C) 0.001 mg D) + 0.0001 mg

Answers

Answer:

The correct option is (D).

Explanation:

Uncertainty means lack of certainty in any calculations. It is the quantification of doubts after the calculations are done.

In this problem, we need to find the uncertainty in the measurement 0.0035 mg. There are 4 numbers after decimal. It means uncertain digit 1/10000 is the smallest scale division.

Hence, the uncertainty in the measurement 0.0035 mg is +0.0001 mg

A certain element XX has four isotopes. 5.845% of XX has a mass of 53.93961 amuamu. 91.75% of XX has a mass of 55.93494 amuamu. 2.123% of XX has a mass of 56.93539 amuamu. 0.2820% of XX has a mass of 57.93328 amuamu. What is the average atomic mass of element XX? Express your answer numerically to four signif

Answers

Answer:

55.85 amu

Explanation:

Let A, B, C and D represent the four isotopes of element X.

The following data were obtained from the question:

Isotope A:

Abundance (A%) = 5.845%

Mass of A = 53.93961 amu

Isotope B:

Abundance (B%) = 91.75%

Mass of B = 55.93494 amu

Isotope C:

Abundance (C%) = 2.123%

Mass of C = 56.93539 amu

Isotope D:

Abundance (D%) = 0.2820%

Mass of D = 57.93328 amu

Average atomic mass of element X =.?

The average atomic mass of X can be obtained as follow:

Average Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100] + [(Mass of D × D%)/100]

Average Atomic mass = [(53.93961 × 5.845)/100] + [(55.93494 × 91.75)/100] + [(56.93539 × 2.123)/100] + [(57.93328 × 0.2820)/100]

= 3.15277 + 51.32031 + 1.20874 + 0.16337

= 55.84519 ≈ 55.85

Therefore, the average atomic mass of X is 55.85 amu

How many Ethers were in existence at launch and why? 1. 21 million because they wanted to have more units than Bitcoin 2. 72 million because they couldn't make any less 3. 72 million because they needed to raise cash for its development 4. 21 million because they needed some to use on the testnet

Answers

Answer:

72 million because they needed to raise cash for its development

Explanation:

It is a known fact that at lunch Ethereum had only 72 million tokens in existence back in July 2015. In other to develop the Blockchain network further, the founder, Vitalik Buterin organized a fundraising event around July and August 2014.

Fast forward to the year 2020, Ether now has a total supply of about 112 million.

If you were running an experiment to determine the temperature at which beans sprouted (germinated) the fastest, what would be the outcome (dependent variable)?

Answers

Answer:

Temperature on beans sprouted

Explanation:

The variable amount is the amount that changes continuously. We calculate the sprout of the bean at which temperature it is sprouting rapid, in that case, the temperature acts as a variable amount.

How many neutrons are there in 8 molecules of
[tex] \frac{19}{9} f2[/tex]

Answers

Answer:

128 neutrons

Explanation:

How many neutrons are there in 8 molecules of [tex]^{19} _9 F_2[/tex]?

Step 1: Calculate the number of neutrons in 1 atom of F.

The atomic number (z) of F is 9 and its mass number (A) is 19. We can calculate the number of neutrons using the following expression.

n⁰ = A - Z = 19 - 9 = 10

Step 2: Calculate the number of neutrons in 1 molecule of F₂.

1 molecule of F₂ contains 2 atoms of F. The number of neutrons in  1 molecule of F₂ is:

(8 n⁰/1 atom F) × (2 atom F/1 molecule F₂) = 16 n⁰/1 molecule F₂

Step 3: Calculate the number of neutrons in 8 molecules of F₂

8 molecule F₂ × 16 n⁰/1 molecule F₂ = 128 n⁰

What is the freezing point of an aqueous 1.00 m NaCl solution? (Kf = 1.86 *C/m) (Assume complete dissociation of the salt.)

Answers

Answer:

The freezing point is -3.72 degrees Celsius

Explanation:

In this question, by assuming the complete dissociation of the salt, we want to calculate the freezing point of an aqueous 1 M NaCl solution .

We proceed as follows;

Firstly, we write the dissociation equation;

NaCl ——> Na+ + Cl-

So the number of ions present in the dissociation is 2. This means that the Vant Hogg factor also called I = 2

Mathematically;

ΔTf = Kf*m*i

m represents the molality which is given as 1

So by substituting the values, we have;

ΔTf = 1.86 * 1 * 2 = 3.72 degrees Celcius

The freezing point however is 0 - ΔTf = 0 - 3.72 = -3.72 degrees Celcius

Which of the following fluids has the greatest concentration of potassium ions?
a. Extracellular fluid (ECF).
b. Interstitial fluid.
c. Cytosol.
d. Plasma.

Answers

B is your correct answer

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the correct option is option C.

What is matter?

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

Cytosol is the liquid medium contained within a cell. The cytosol is a component of the cytoplasm. Out of given option cytosol  has the greatest concentration of potassium ions. The cytoplasm does not include the nucleus.

Therefore, the correct option is option C.

To learn more about matter, here:

https://brainly.com/question/4562319

#SPJ2

Atoms of the same element can have different forms; for example, carbon-12 and carbon-14.
What causes the different forms?


What are these forms called?

Answers

A carbon-12 atom has 6 protons (6P) and 6 neutrons (6N). But some types of carbon have more than six neutrons. We call forms of elements that have a different number of neutrons, isotopes. For example, carbon-14 is a radioactive isotope of carbon that has six protons and eight neutrons in its nucleus.
Hope that helps

Which of the following statements about 13C NMR is not true?A. In 13C proton-decoupled NMR spectra, all peaks are singlets.B. 13C NMR spectra display peaks for only carbons that bear hydrogen atoms.C. 13C NMR chemical shifts occur over a greater range than 1H NMR chemical shifts.D. 13C NMR easily differentiates between the different hybridized carbons (sp3, sp2, and sp hybridized carbons).organic-chemistry

Answers

Answer: .B. 13C NMR spectra display peaks for only carbons that bear hydrogen atoms.

Explanation:

The statements that are true about 13C NMR are:

A. In 13C proton-decoupled NMR spectra, all peaks are singlets.

C 13C NMR chemical shifts occur over a greater range than 1H NMR chemical shifts.

D. 13C NMR easily differentiates between the different hybridized carbons (sp3, sp2, and sp hybridized carbons).organic-chemistry

Therefore, the option that isn't true is option B. "13C NMR spectra display peaks for only carbons that bear hydrogen atoms". This is false because 13C NMR will show every peak in the spectrum and it doesn't matter if it's only carbons that bear hydrogen atoms as everything will be shown.

19) What did Rutherford's experiment show?

Answers

Answer:

experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus.

Explanation:srry im late but i dont be on it like that  hoped it helped tho srry

Define self reduction reaction.

Answers

Answer:

Self-reduction is a reaction in which no external reducing agent is required. It is called self-reducing because copper oxide itself reduced the copper sulfide to give copper and sulfur dioxide.

Can someone please help with chemistry? Lead has a density of 10.5 g/cm^3. What is the diameter of a lead ball that has a mass of 500.0g? Report your answer in cm.

Answers

Density = Mass / Volume

10.5 = 500 / x

10.5x = 500

x = 50 cm^3 (1 sig fig) volume of the sphere

Volume of a sphere = 4/3 pi r^2

pi = 3.14 r = radius

50 = 4/3 pi r^3

50•3/4 = pi r^3

37.5 = pi r^3

37.5/pi = r^3

11.9 = r^3

cube root(11.9) = r

2.3 = r

Diameter = 2•radius

Diameter = 2 • 2.3

Diameter = 5 cm (1 sig fig) diameter



Give the charge on the transition metal of each of the following compounds:

A. Au2SO4
B. Fe2(CrO4)3
C. Zn(OH)2


Enter your answer as +1, +2, etc.

Au
type your answer...

Fe
type your answer...

Zn
type your answer...

Answers

Au +2
Fe +2
Zn+2
Here’s my periodic table. I hope it helps

In Au₂SO₄, the charge on each gold atom is +3.

The charge on the transition metal gold (Au) in Au₂SO₄ can be determined by considering the overall charge of the compound and the charges of the other ions present. In this case, the sulfate ion carries a charge of -2.

Charge on Au: +3

In Fe₂(CrO₄)₃, the transition metal iron (Fe) is present. The compound contains two iron atoms. To determine the charge on each iron atom, the charges of the other ions in the compound. The chromate ion carries a charge of -2, and the compound as a whole is neutral.

Charge on Fe: +3

The transition metal zinc (Zn) is present in Zn(OH)₂. To determine the charge of the zinc ion, to consider the charges of the other ions. The hydroxide ion (OH-) carries a charge of -1. Since there are two hydroxide ions, their combined charge is -2.

Charge on Zn: +2

To learn more about atom, follow the link:

https://brainly.com/question/1566330

#SPJ6

Which is an example of pure chemistry? a. shape of a soybean plant b. chemicals containing carbon c. finding an antidote

Answers

I believe that it is B chemicals containing carbon

Give the name of each ion.
S2-

N3-

Answers

Answer:

The answer is Sulphur and Nitrogen ion

Significant figure of 0.06300

Answers

Answer:

Number of Significant figures is : 4

Scientific Notation is: 6.3 x 10^-2

EXTRA HELP

what's evaporation according to kinetic particle theory?​

Answers

Answer:

Evaporation is a change of phase from liquid to gas explained as follows : When particles in the liquid phase are heated, they gain kinetic energy and move faster and further apart.

what were the limitations of Dobereiner's classifcation?​

Answers

Answer:

Dobereiner could find only three triads; . i.e total of 9 elements only. However the total number of elements were more than that of those encompassed in Dobereiner's Triad

Explanation:

Answer:

Dobereiner could find only three triads; . i.e total of 9 elements only. However the total number of elements were more than that of those encompassed in Dobereiner's Triad. Thus, Dobereiner's could not be classify most of the elements known at that time

Explanation:

This work is not my own.... copied from google but hope this helps you.

2-An analysis that establishes the chemical identity of the species
A)Quantitative Analysis
B) Quantitative Synthesis
C)Qualitative Analysis
D)Qualitative Synthesis
Q1-(30 Marks) Choose the correct answer​

Answers

Answer:

C Qualitative Analysis.

Explanation:

B)Quantitative Synthesis

A beaker can hold 200 cm3 of water. When it's empty, how
many liters are needed to refill it?
L

Answers

Answer:

[tex]V=0.200L[/tex]

Explanation:

Hello,

In this case, since the volumetric capacity of the beaker is 200 cm³, by considering that 1000 cm³ equals 1 L, the liters are then computed via the following unit conversion:

[tex]V=200cm^3*\frac{1L}{1000cm^3}\\ \\V=0.200L[/tex]

Best regards.

Which process results in two identical cells?
O meiosis
O replication
O fertilization
O mitosis
May u please help i mark brainlist ! :D

Answers

Answer:

fertilization i think

Explanation:

because during fertilization process two identicle cell divisions takes place

Answer:

fertilization

Explanation:

edgenuity

What does a cell nucleus do?

Select one:
a. control everything the cell does
b. surround the cell
c. hold important chemicals the cell needs
d. protect the cell.

Answers

Answer:

a. control everything the cell does

Explanation:

the nucleus is like the brain of the cell

help me please, i appreciate it

Answers

Answer:

Wind and Hydroelectricity can be considered forms of solar energy.

Explanation:

Wind power is a form of solar energy because winds are caused by the heating of the atmosphere by the sun, the rotation of the Earth, and the Earth's surface irregularities. For as long as the sun shines and the wind blows, the energy produced can be harnessed to send power across the grid.

Hydroelectricity is a form of solar energy because Hydropower relies on the water cycle.

The water cycle has three steps:

Solar energy heats water on the surface of rivers, lakes, and oceans, which causes the water to evaporate.

Water vapor condenses into clouds and falls as precipitation—rain and snow.

Precipitation collects in streams and rivers, which empty into oceans and lakes, where it evaporates and begins the cycle again.

A 500 gram piece of metal had a volume of 2.75cm3. What is it’s density

Answers

Answer:

181.82 g/cm3

Explanation:

density is mass / volume so it is 500 / 2.75=181.82 g/cm3

When measuring solid NaOH in pellet form, explain why you won’t be able to measure exactly 1.000 grams. What are the consequences of this?

Answers

Answer:

Explanation:

Pellet form of NaOH is highly hygroscopic . It absorbs moisture from air and its weight is increased by the time one tries to weigh one gram of it . Moreover it also reacts with carbon dioxide gas of atmosphere to form sodium carbonate .

2 NaOH + CO₂ = Na₂CO₃ + H₂0.

It also increases its weight .

An example of an extensive physical property is
Group of answer choices

mass

density

boiling point

melting point

Answers

Answer:

Mass and density is the answer?

What is the solubility product expression for Zn3(PO4)2?

Answers

Answer:

[tex]Ksp=[Zn^{2+}]^3[PO_4^{3-}]^2[/tex]

Explanation:

Hello,

In this case, since the equilibrium dissociation of zinc phosphate is:

[tex]Zn_3(PO_4)_2(s)\rightleftharpoons 3Zn^{2+}(aq)+2(PO_4)^{3-}(aq)[/tex]

Due to the fact that only the zinc and phosphate ions are in aqueous state, the solubility product expression is written considering the law of mass action in which the concentration of each species is powered to the corresponding stoichiometric coefficient as follows:

[tex]Ksp=[Zn^{2+}]^3[PO_4^{3-}]^2[/tex]

Best regards.

is there any compound like O2C NO2​

Answers

Answer:

Aye Wassup? Adam Here :D

Explanation:

Nitrogen dioxide is a chemical compound with the formula NO 2.It is one of several nitrogen oxides. NO 2 is an intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year for use primarily in the production of fertilizers.At higher temperatures it is a reddish-brown gas.

Hope This Helped Bro: "AdamDaAssasin"

The temperature at which carbon dioxide sublimes is about 195 K. What is this
temperature in units of degrees Celsius?

Answers

This temperature in units of degree Celsius is..

-78° Celsius

-78° Celsius is the temperature in units of degrees Celsius.

What is temperature?

Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius.

195 Kelvin = 195 - 273.15 = -78.15 Celsius.

-78° Celsius is the temperature in units of degrees Celsius.

Learn more about temperature here:

https://brainly.com/question/23411503

#SPJ2

Other Questions
Whoever answers first is brainliest Solve using 2-step equations.You got a job which only pays salary without commission.You earn $40,000 per year. You're living with your parents,so bills this month will only be $400, but you want to put$2000 into your savings.After paying bills and putting money aside in savings, howmuch will you have left over? 0.018 0.03. NO WRONG ANSWERS OR ELSE WILL REPORT. IF CORRECT WILL MARK U AS BRAINILIST worksheet mathWrite the group of natural number Help me plz !!!!!!!!!!!!!!! Which best describes the relationship between temperature and dissolved oxygen in a lake?As temperature increases, dissolved oxygen increases.As temperature increases, dissolved oxygen decreases.As temperature decreases, dissolved oxygen decreases.A change in temperature has noeffect on dissolved oxygen. Can somebody help me with math just text in comments below 360 times 4 + 77= ? What were the economic results of Spanish silver mining in theAmericas? Suppose PR = 54, solve for QR4x-13x-1PR How do those views differ from how she describes herself? I NEED HELP ASAPP PLEASE THIS IS DUE FOR SCHOOL PLEASE HELP ASAP and I don't have a calculator at home so I can't do this 2{3+10/2+62-(4+2)} For the right triangles below, find the exact values of the side lengths b and d.If necessary, write your responses in simplified radical form.60305b =b4545d7 =d A chemist is testing the quality of a wine produced by a vineyard. Which branch of chemistry might the chemist use? physical chemistry analytical chemistry inorganic chemistry organic chemistry 17. Choose the correct definite article: En la clase de ingls, yo tengo 1. _______cuadernos rojos.ellaloslas help help i need help please On what type of map would you see mountains, hills, plains and oceans? the people rule in this kind of government Consider the following cost structures for three oil producers: Fossils R UsGreen House OilsShale Ale Plant and property$900,000$1,500,000$1,000,000 Extraction costs (per barrel)$45$31$40 Capacity per day100,000 barrels140,000 barrels80,000 barrels If the price for a barrel of oil is currently $42, what is the amount of barrels produced by these suppliers? 5. If the lever arm is longer than the load arm, this lever system would bea class three lever systemb. a high speed systemc. a power systemd. disfunctional and is never seen in biological systems. Which one of the following is true of the structures labeled D in the cell membrane?A.They are membrane proteins.B.They are hydrophilic.CThey are carbohydrates.D.They are hydrophobic?