Which of the following is an example of a chemical change
A. apple slices turn brown
B. toast burns
C. silver tarnishes
D. all of these are chernical changes​

Answers

Answer 1

Answer:

D. all of these are chemical changes


Related Questions

The number of ATP molecules produced during the anaerobic phase of cellular respiration is _______

2
8
16
32

Answers

Answer:

The number of ATP molecules produced during the anaerobic phase of cellular respiration is 32 ATP.

Explanation:

Actually it's 36 ATP

8 from glycolysis

6 from pyruvate

24 from Krebs cycle

So total are 38 ATP but 2 ATP are consumed during glycolysis so total will be 36.

convert 13.4 degrees celcius into kelvin​

Answers

Answer:

286.55K

Explanation:

To convert to kelvin , add 237 .15

[tex]13.4\°C + 273.15 = 286.55K[/tex]

Answer:

13.4 degrees celsius =

286.55 kelvins

Temperature

13.4

Celsius

286.55

Kelvin

Formula

13.4°C + 273.15 = 286.55K

Explanation:

HOPE THAT HELPS YOU

How many m^3 are in 56cm^3?

Answers

Answer:

5.6 × 10-5 m^3

Explanation:

Hope this helps

7. What happen if we don't have water?

Answers

Answer:

our bodies will dehydrate causing us to die a dreadfully excruciating painful death

Which solution has the lower freezing point in each of the following pairs? (a) 11.0 g of CH3OH in 100. g of H2O or 22.0 g of CH3CH2OH in 200. g of H2O? CH3OH/H2O CH3CH2OH/H2O Both solutions have the same freezing point. (b) 20.0 g of H2O in 1.00 kg of CH3OH or 20.0 g of CH3CH2OH in 1.00 kg of CH3OH? H2O/CH3OH CH3CH2OH/CH3OH Both solutions have the same freezing point.

Answers

Answer:

See explanation

Explanation:

(a)

From the data provided;

Mass of methanol =11.0 g

Mass of solvent (H2O) =100 g = 0.1 kg

Molar mass of CH3OH =32.04 g/mol

Number of moles of solute = 0.343 mol

molality(m) of methanol = 3.43 m

Also,

Mass of ethanol =22.0 g

Mass of solvent (H2O) =200 g = 0.2 kg

Molar mass of C2H5OH =46.068 g/mol

Number of moles of solute = 0.477 mol

molality(m) of ethanol= 2.38 m

The greater the concentration of a solution, the higher the freezing point of solvent will be depressed. Therefore, higher molality, leader to a greater decrease of the freezing point.

Therefore, the freezing point of methanol CH3OH/H2O is lower than the freezing point of ethanol.

b)

Mass of solvent = 1 kg

Mass of water = 20g or 0.02 Kg

Molar mass of water = 18 gmol-1

Number of moles of solute = 20g/18 gmol-1 = 1.11 moles

Molality= 1.11 moles/1 kg = 1.11 m

Also;

Mass of ethanol = 20 g = 0.02 kg

Mass of solvent = 1.00 Kg

Molar mass of solute = 46 gmol-1

Number of moles of solute = 20g/ 46 gmol-1 = 0.43 moles

Molality= 0.43 moles/ 1 kg = 0.43 m

The greater the concentration of a solution, the higher the freezing point of solvent will be depressed. Therefore, higher molality, leader to a greater decrease of the freezing point.

Therefore, the freezing point of water H2O/CH3OH is lower than the freezing point of ethanol.

Element T exists as three isotopes: T-12 (98.90%), T-13 (1.00%) and T-14 (0.10%). Calculate the
average atomic mass of the element T.
Answer choices:
- 12.01 amu
- 11.72 amu
- 1200 amu
- 13 amu

Answers

Answer:

-10.00amu

ok.......... !!!!!

The average atomic mass of the element T is 12.012 amu.

What is average atomic mass?

The average atomic mass is defined as the atoms' weighted average mass in a naturally occurring sample of the element.

It is also defined as the average atomic mass of all naturally occurring isotopes of all elements.

The average atomic mass  can be expressed as

Average atomic mass = f1m1 + f2m2 + f3m3

                                    = 0.989 x 12 + 0.01 x 13 + 0.001 x 14

                                    = 11.868 + 0.13 + 0.014

                                    = 12.012 amu

Thus, the average atomic mass of the element T is 12.012 amu.

To learn more about average atomic mass, refer to the link below:

https://brainly.com/question/13753702

#SPJ5

A running track measures 1056 ft per lap. To run 15.0 km, how many laps should you run?

Answers

Answer:

46.6 laps

Explanation:

Step 1: Given data

Length of the lap (l): 1056 ftTotal distance to be run (d): 15.0 km

Step 2: Convert "l" to km

We will use the conversion factor 1 km = 3280.84 ft.

1056 ft × (1 km / 3280.84 ft) = 0.3219 km

Step 3: Calculate the number of laps that you should run

We will use the following expression.

laps = d/l

laps = 15.0 km/(0.3219 km/lap)

laps = 46.6 laps

Which technology has helped improve scientists’ ability to gather scientific data about the movement of sea turtles? satellite tracking thermometers probeware microscopes? ​

Answers

Answer:either satellite tracking or probware.

Explanation:probate. Think its satalite tracking hope this helps.

Answer:

its satellite tracking

Explanation:

i got it right on edge

Which of the following statements is true about the arrangement of particles in matter?
B. The particles in aliquid are spread farther apart than the particles in a gas.
A. The particles in a gas are closer together than the particles in a liquid
D. The particles in a solid are spread farther apart than the particles in a liquid
C. The particles in a gas are spread farther apart than the partides in a solid

Answers

Answer:

C. The particles in a gas are spread farther apart than the particles in a solid

Explanation:

Solids are made up of tightly-packed particles that form a rigid shape. Liquids are comprised of loosely connected particles that can slightly move. Gases are made up of fast-moving disconnected particles that are spread far apart.

which two models would be most useful in predicting weather​

Answers

Answer:mathematical and map

Explanation:

mathematical and map

Explanation:

Which of the following are false about Prokaryotic Transcription termination?
A. It can occur in a factor dependent fashion.
B. It can occur in a factor independent fashion.
C. It may involve Rho protein.
D. none of the above.

Answers

Answer: none of the above

Explanation:

In Prokaryotic Transcription termination, it should be noted that the RNA polymerase transcribes through a terminator sequence, which in turn results in the polymerase to be separated from the DNA and thereby leads to its release of the transcrip.

Prokaryotic Transcription termination can occur in a factor dependent fashion, can occur in a factor independent fashion and may involve Rho protein.

Therefore, none of the options is false.

Select the meaning of the word sign that best
describes this image.
O to write as a signature
P
a gesture used to express an idea
O an object that conveys meaning
O a symbol used to abbreviate words






WHAT IS ITRT

Answers

Answer:

an object that conveys meaning

Explanation:

Answer:

c

Explanation:

Determine the number of mm in 14.3cm

Answers

Answer:

143 mm . covert it an determine an individual percentage .

Which common item is made from copper?

soap
coins
baby powder
colored pencils

Answers

Coins just like pennies

Answer:

coins

Explanation:

Look at the list of wealthy Americans under the heading “Half a Billion Back of M'Kinley."
What were the two most common industries of the business leaders on
this list?
manufacturing and carpets
banking and railroads
o jewelry and transportation

Answers

Answer:

banking and railroads

Explanation:

The  two most common industries of the business leaders on this list are banking and railroads.

What are industries?

Industry is a group of productive enterprises or organizations that produce or supply goods, services, or sources of income. In economics, industries are generally classified as primary, secondary, tertiary, and quaternary; secondary industries are further classified as heavy and light.

Primary industry sector of a nation’s economy includes agriculture, forestry, fishing, mining, quarrying, and the extraction of minerals. It may be divided into two categories: genetic industry, including the production of raw materials that may be increased by human intervention in the production process; and extractive industry, including the production of exhaustible raw materials that cannot be augmented through cultivation.

Learn more about industries,here:

https://brainly.com/question/7721379

#SPJ2

If a horse is at a stop and then starts running is the horse accelerating or decelerating?

Answers

Answer:

accelerating

Explanation:

technically, there is no such thing as deceleration, just negative acceleration.

The horse is accelerating.

Using the mmoles of (35)-2,2,-dibromo-3,4-dimethylpentane calculated earlier and the molecular weight of the product (962 g/mol). Predict the theoretical 1 0096 yield of the product in grams. Round to the hundredths place.

Answers

Answer:

The yield of the product in gram is [tex]\mathsf{{w_P}=0.26 \ gram}[/tex]

Explanation:

Given that:

the molecular mass weight of the product = 96.2 g/mol

the molecular mass of the reagent (3S)-2,2,-dibromo-3,4-dimethylpentane is 257.997 g

given that the millimoles of the reagent = 2,7 millimoles = [tex]2.7 \times 10^{-3} \ moles[/tex]

We know that:

Number of moles = mass/molar mass

Then:

[tex]2.7 \times 10^{-3} = \dfrac{ mass}{257.997}[/tex]

[tex]mass = 2.7 \times 10^{-3} \times 257.997[/tex]

mass = 0.697

Theoretical yield = (number of moles of the product/ number of moles of reactant) × 100

i.e

Theoretical yield = [tex]\dfrac{n_P}{n_R}\times 100\%[/tex]

where;

[tex]n_P = \dfrac{w_P}{m_P}[/tex]    and [tex]n_R = \dfrac{w_R}{m_R}[/tex]

Theoretical yield = [tex]\dfrac{(\dfrac{w_P}{m_P})}{(\dfrac{w_R}{m_R})} \times 100\%[/tex]

Given that the theoretical yield = 100%

Then:

[tex]100\% =\dfrac{(\dfrac{w_P}{m_P})}{(\dfrac{w_R}{m_R})} \times 100\%[/tex]

[tex]\dfrac{w_P}{m_P}=\dfrac{w_R}{m_R}[/tex]

[tex]{w_P}=\dfrac{w_R \times m_P}{m_R}[/tex]

where,

[tex]w_P[/tex] = derived weight of the product

[tex]m_P =[/tex]the molecular mass of the derived product

[tex]m_R =[/tex] the molecular mass of the reagent

[tex]w_R[/tex] = weight in a gram of the reagent

[tex]{w_P}=\dfrac{w_R \times m_P}{m_R}[/tex]

[tex]{w_P}=\dfrac{0.697 \times 96.2}{257.997}[/tex]

[tex]\mathsf{{w_P}=0.26 \ gram}[/tex]

Phil has to put the greatest number of apples and oranges in each box so each box has the same number of apples and oranges. Should Phil use the greatest common factor (GCF) or the least common multiple (LCM) to solve the problem

Answers

Answer:

GCF

Explanation: Your question says "The GREATEST number of apples and oranges" Key word is "greatest".

Miss White wants to make a (decidedly not poisoned) apple pie. The recipe she is
using asks for a specific mass of apples, but Miss White doesn't have a balance, so
finding mass directly will be difficult. What she DOES have is a graduated cylinder,
which she uses to find that her apples have a volume of 786,3 ml. She also knows
that her apples have a density of around 0.98 g/ml. What is the mass of Miss
White's apples? Please round your answer to 0.01 grams.

Answers

So you have to multiply 786,3 times 0.98 to get the mass the mass is 770.57 if u round its 770.6 or 771

Which of the following would be a good solvent choice when preparing your sample for 1H NMR?
a. CD2C12
b. СНЗОН
c. More than one of the answer choices
d. CH2C12
e. None of the answer choices
f. CD3OD

Answers

Answer:

e. None of the answer choices

Explanation:

The solvents used for 1HNMR analysis are chloroform D (CDCl3), and acetone D6 (CD3COCD3) and deuterium oxide (D2O). And here any of these three nans are listed in the given option so that we can say that none of the answers are correct. so correct answer is e. None of the answer choices

KCl is an ionic salt with a formula weight of 74.54 g/mole. A 1.417 M (mole/liter) KCl solution has a density of 1064.5 grams/liter at 20.0 OC. Use the Molarity and the formula weight to find the mass (g) of salt in one liter. Then, find the mass (g and kg) of water in one liter of the solution as the difference between the solution mass and the KCl mass. Include the conversion factor. Determine the molality (m), or moles of salt per kg of water, by dividing the moles of salt in one liter by the kg of water in one liter. Show all units and use proper significant figures. (

Answers

Answer:

Mass of the salt:  105.6g of KCl.

Mass water: 958.9g of water.

Molality: 1.478m.

Explanation:

Mass of the salt:

In 1L, there are 1.417 moles. In grams:

1.417 moles KCl * (74.54g / mol) = 105.6g of KCl

Mass of the water:

We can determine the mass of solution (Mass of water + mass KCl) by multiplication of the voluome (1L and density 1064.5g/L), thus:

1L * (1064.5g / L) = 1064.5g - Mass solution.

Mass water = 1064.5g - 105.6g = 958.9g of water

Molality:

Moles KCl = 1.417 moles KCl.

kg Water = 958.9g = 0.9589kg.

Molality = 1.417mol / 0.9589kg = 1.478m

Which of the following gases is the least soluble in water and why? CO2, SO3, N2, NH3, HCl.

Answers

Answer:

SO3

It has the highest molar mass value and thus would be the least soluble

Explanation:

In this question, we want to know which of the gases is the least soluble in water.

The easiest way to do this is to calculate the molar masses of these gases. The gas with the highest molar mass is the heaviest and thus will be the least soluble in water

For CO2 - molar mass is 44 g/mol

For SO3- molar mass is 80 g/mol

For N2- molar mass is 28g/mol

For NH3-molar mass is 17g/mol

For HCl- molar mass is 36.5 g/mol

From the molar masses, we can see that the molar mass of the ammonia gas is the lightest and thus, it is the most soluble.

The mass of the sulphur vi oxide is the highest and thus it is the heaviest and the least soluble in water

How does accuracy and precision impact your life

Answers

Explanation:

Accuracy refers to the closeness of a measured value to a standard or known value. For example, if in lab you obtain a weight measurement of 3.2 kg for a given substance, but the actual or known weight is 10 kg, then your measurement is not accurate. In this case, your measurement is not close to the known value.

Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. Precision is independent of accuracy. You can be very precise but inaccurate, as described above. You can also be accurate but imprecise.

For example, if on average, your measurements for a given substance are close to the known value, but the measurements are far from each other, then you have accuracy without precision.

A good analogy for understanding accuracy and precision is to imagine a basketball player shooting baskets. If the player shoots with accuracy, his aim will always take the ball close to or into the basket. If the player shoots with precision, his aim will always take the ball to the same location which may or may not be close to the basket. A good player will be both accurate and precise by shooting the ball the same way each time and each time

what would happen to the solvent if a reaction was refluxed without a condenser​

Answers

Answer:

Solvent will be lost as gas and not return into the vessel via condensation.

Explanation:

Reflux is a technique used in chemistry to boil a particular solvent and convert the gas formed back into liquid by condensation. This technique allows a solvent to be heated at a regulated temperature but for a prolonged period of time than it would normally take place.

The reflux procedure makes use of a reflux CONDENSER, which is an apparatus that allows vapour from the heating/boiling to flow back into the reaction vessel. The CONDENSER functions to prevent the loss of the SOLVENT as vapour by providing a cooling effect on the vapour.

Therefore, if a reaction was refluxed without a condenser, THE SOLVENT WILL BE LOST AS VAPOUR

Use the clues you highlighted to choose the best
meaning of beat in this sentence.
Highlight the context clues that help you choose
the best meaning of the word beat.
Our family beat a retreat back to the sofa as if chased by
enemy soldiers
- "The All-American Slurp."
Lensey Namioka
O defeated
O mixed
hurried
musical rhythm

Answers

Answer:

hurried

Explanation:

because they retreated back to the couch so hurried.

Answer:

c

Explanation:

You estimate that you sent 135 texts last week but when you get the bill, it was actually 175. Calculate the percent error

Answers

Answer: -40

Explanation: Percent error is calculated by subtracting the value you actually recieved from the literature value (175 in your case)  SO your answer should be 135-175=-40.

Express 2.99 x 108 m/s (the speed of light) in decimal notation (i.e., express the

number without using scientific notation

Answers

Answer:

speed of light = 299,000,000 m/s

Explanation:

The speed of light in vacuum, denoted as c,  is a universal physical constant which unlike space and time, is independent of the observer. It is a constant that is important in many fields of science. Its exact value is given as 299,792,458 metres per second.

In scientific notation, it is approximately given as 2.99 x 10⁸ metres per second.

2.99 x 10⁸ metres per second = 2.99  x 100000000 = 299,000,000 m/s

Therefore, when expressed in decimal notation, the speed of light = 299,000,000 m/s.

How does the arrangement of atoms differ in crystals and glass?

Answers

crystals have well organized arrangement of atoms. non crystals have irregular unorganized arrangement of atoms :)

How does the arrangement of atoms differ in a crystalline and a noncrystalline substance? Crystals have well organized arrangement of atoms. Non crystals have irregular unorganized arrangement of atoms. You just studied 13 terms!

Which best justifies the accuracy of the claim?

Answers

Answer:

A

Explanation:

the 2nd artical is against global warming while the first one uses scientific evidence

Convert 0.0017hL into mL

Answers

Answer:

170ml

Explanation:

multiply the volume value by 100000

Other Questions
combining like terms with negative coefficients and distribution -5(3x+10)-2(4x-5) ? identify and label each part of the eukaryotic cell Find the mode:3.8, 4.2, 4.0, 4.2, 4.2 A dog walking along some train tracks meets a train every 4 minutes and the train catches up the dog every 12 minutes. Find the value of x if the trains leave the endpoint of the route every x minutes. What might cause someones mental map to change Why were theIndo-Europeansimportant? 9. The maximum value of a data setconsisting of 25 positive integers is 84. Anew data set consisting of 26 positiveintegers is created by including 96 in theoriginal data set. Which of the followingmeasures must be 12 greater for the newdata set than for the original data set? Answer the question in the photo the price of gravel is $24 for every 3/8 ton. kate wants to know the price of 2 tons of gravel Let U = {English, French, History, Math, Physics, Chemistry, Psychology, Drama}, A = {Math, History, Chemistry, English}, B = {Psychology, Drama, French, Chemistry, English}, and C = {Physics, History, French}. Find the following. n(B) + n(C) What continuation signal word indicates that the secondsentence contains more information about the sametopic as the first sentence?andthusmoreanother ILL MARK BRAINLIST !!Softball was once an Olympic sport, it was a way to showcase the talent of athletes. What aspect of the experience of being a student does Sedaris count on as common ground between himself and his readers? A store sold 4 pen drives and 10 hard drives on the first weekend and made 200 dollars, in the second weekend the store sold 6 pen drives and 14 hard drives and made 290 dollars? what is the price of pen drive and hard drive Medieval writers often structured a narrative by _____. telling a story within a story having many narrators tell the same story from different points of view presenting events from the perspective of a Divine Being recounting the life of an ordinary person from beginning to end WILL MARK BRAINLIEST TO WHOEVER ANSWERS CORRECT FIRST For spring break, Melanie will either stay home or go to Daytona Beach. At home, Melanie pays $10 per day for food and earns $90 a day at her job. At Daytona Beach, Melanie will stay with friends and so has no lodging cost. She will pay $20 per day for food. In terms of dollars, Melanie's opportunity cost per day of going to Daytona Beach is how much are concept maps and mind maps the same???( PLZ I NEED AN ANSWER ASAP ) A cheetah runs at a constant velocity of 7 m/s. What is its acceleration in m/s/sPLEASE HELP 1. Carmen travels from Lagos in Africa to Brussels in Europe. Whichof the following statements are true?1. Her longitude does not significantly change.II. Her latitude changes significantly.III. She is moving toward the North. Answer from below Abcd