A chemist is studying an unknown substance. He can break it into its elemental components only by using chemical means.

Based on this observation, how should the unknown substance be classified?
impure substance
solution
mixture
pure substance

Answers

Answer 1

Answer:

C, Mixture

Explanation:

Answer 2

Answer:

the correct answer is actually D pure substance

Explanation:


Related Questions

HELPPPP I WILL GIVE YOU BRAIN THINGG WHATEVER ITS CALLED

We have learned that there are five steps to reading a new piece of music. Can you name all five steps?

Answers

Notes, Pitches, Articulation, Phrasing, and Musical Extras.

You come across a mysterious substance that has a mass of 1.8225 x 10 to the power of 2g
and a volume of 0.025 L (1L = 1000 mL). Using the density formula what is the density

Answers

Answer:

192

Explanation:

Bc its 182

Calculate the entropy change when 4.31 g of H2 reacts with O2 according to the reaction

2 H2(g) + O2(g) → 2 H2O(l)

at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(l) at 298 K is −285.8 kJ/mol. The corresponding free energy of formation is −237.2 kJ/mol.

Answer in units of J/K.

Answers

Answer:

Explanation:

ΔG  =  Δ H - T ΔS

Given , ΔG = -237.2 kJ / mol

Δ H = - 285.8 kJ / mol

T = 298

Putting the values in the equation

-237.2 = - 285.8 - 298 x ΔS

ΔS  = .163 kJ / mole K

moles of water formed = 4.31 / 2 = 2.155

entropy change required = 2.155 x .163 kJ / K

= 351.26 J / K .

how many molecules are in CO²​

Answers

Answer:

53.11× 10²³ molecules

Explanation:

Given data:

Number of molecules of CO₂ = ?

Mass of CO₂ = 388.1 g

Solution:

Formula:

Number of moles = mass/ molar mass

Molar mass of CO₂ = 12× 1 + 16×2

Molar mass of CO₂ = 44 g/mol

Now we will put the values in formula.

Number of moles = 388.1 g/ 44 g/mol

Number of moles = 8.82 moles

Now we will calculate the number of molecules by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

8.82 mol × 6.022 × 10²³ molecules / 1 mol

53.11× 10²³ molecules

Brainliest plz?

Answer:

Now times by Abogadros constant: 1* 6.022*10^23=6.022*10^23 molecules of CO2 are present.

Explanation:

We know the molar mass of CO2(g) is 44.01⋅g⋅mol−1 . And so Avogadro's number of carbon dioxide molecules have this mass... And we take the product of the quotient... Molecules of carbon dioxide=5.00⋅mol×6.022×1023⋅mol−1≅30×1023⋅carbon dioxide molecules.

The unknown element (Johnsonium, Jo) contains three naturally occurring isotopes. The relative abundances and atomic mass are:
Moorium-36: abundance = 1.32%, mass = 35.978amu
Moorium-38: abundance = 3.25%, mass = 37.963amu
Moorium-40: abundance = 95.43%, mass = 39.962amu
What is the average atomic mass of "Moorium?"

Answers

Answer:

Average atomic mass of moorium is 39.844 amu.

Explanation:

Given data:

Atomic mass of moorium-36 = 35.978 amu

Relative abundance of  moorium-36 = 1.32%

Atomic mass of moorium-38 = 37.963 amu

Relative abundance of  moorium-38 = 3.25%

Atomic mass of moorium-40 = 39.962 amu

Relative abundance of  moorium-38 = 95.43%

Solution:

Average atomic mass moorium = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)+ (abundance of 3rd isotope × its atomic mass)  / 100

Average atomic mass of moorium = (1.32×35.978)+(3.25×37.963)+(95.43×39.962) /100

Average atomic mass of moorium =  47.491 + 123.380 +3813.574  / 100

Average atomic mass of moorium = 3984.445 / 100

Average atomic mass of moorium = 39.844 amu

in a hydraulic lift system, the output force is greater than the input force because

Answers

Answer:

In a hydraulic lift system, the output force is greater than the input force because the pressure acting on the output piston is greater than the pressure acting on the input piston.

Explanation:

Which noble gases is closest to magnesium? On the periodic table? What must happen if a magnesium atom for it to have an electron arrangement similar to that of a noble gas?

Answers

Answer:

Neon and loose electrons

Explanation:

Magnesium has an electron configuration of 2e 8e 2e, and Neon is 2e,8e. For Mg to have a similar electron arrangement it must loose its two valence electrons and make it an ion.

Answer:

Noble neon gas is the closest.

Explanation:

noble Neon  gas

The Magnesium would have to lose two electrons

8. What is Planck's law?
O F = hm
O F = MA
O E = hf
O E = mc (squared)

Answers

Answer:

O E = hf

Explanation:

Which example best demonstrates stewardship of the atmosphere

Answers

Incomplete question. However, I provided a specific example of stewardship of the atmosphere.

Explanation:

First, note that the term stewardship refers to the belief that humans are obligated to take care and look after our environment (which includes the atmosphere.

An example of this is: deciding to change our mode of transportation: What this entails is that we may decide to switch to riding a bicycle to places rather than going by car. By so doing you will be reducing the number of greenhouse gases emitted into the environment as bicycles do not emit harmful gases when used.

NEED HELP FAST!!!!
Points A and B are locations on the banks of a river. What are the dominant processes occurring at locations A and B? *


A. deposition at location A; erosion at location B

B. erosion at location A; deposition at location B

C. deposition at both locations A and B

D. Erosion at both locations A and B

Answers

Answer:

C

Explanation:

Which term describes this molecular shape?

A. Tetrahedral

B. Bent

C. Trigonal planar

D. Linear

Answers

Answer:

A

Explanation:

Tetrahedral

The term that describes the molecular structure is Tetrahedral. The correct option is A.

What is molecular structure?

The molecular structure is the structure of the molecular compounds. It tells the presence of ions and bonds in a compound. It is the arrangement of atoms, groups, or ions in a molecule, as well as the quantity and distribution of chemical bonds.

The use and importance of molecular structure are comprehending Nature's complex design principles and blueprints depend on understanding molecular structure.

Perhaps we can start to imitate her lovely items more cheaply and with less negative environmental effects if we can comprehend her plans and fundamental materials. The given compound is tetrahedral.

Thus, the correct option is A. Tetrahedral.

To learn more about molecular structure, refer to the link:

https://brainly.com/question/503958

#SPJ2

40POINTS AND BRAINLIEST Discuss the orders in which electrons are filled in the s and d subshells of the first three elements in group11​

Answers

Step 1: add electrons to fill the 1s subshell (maximum of 2 electrons), when this is full, go to step 2. Step 2: add electrons to fill the 2s subshell (maximum of 2 electrons), when this is full, go to step 3. Step 3: add electrons to fill the 2p subshell (maximum of 6 electrons), when this is full, go to step 4. Step 4: add electrons to fill the 3s subshell (maximum of 2 electrons), when this is full, go to step 5. Step 5: add electrons to fill the 3p subshell (maximum of 6 electrons), when this is full, go to step 6. Step 6: add electrons to the 4s subshell (maximum of 2 electrons), when this is full, go to step 7. Step 7: add electrons to the 3d subshell (maximum of 10 electrons), when this is full, go to step 8. Step 8: add electrons to the 4p subshell (maximum of 6 electrons), when this is full, go to step 9. etc

So for Cu would be: 1s^22s^22p^63s^23p^63d^9

Ag would be: 1s^22s^22p^63s^23p^63d^104s^24p^64d^105s^1

Au would be: 1s^22s^22p^63s^23p^63d^104s^24p^64d^105s^25p^64f^145d^106s^1

Calculate number of moles in 42g of silicon.

Answers

Answer:

[tex]\frac{3}{2}[/tex]

Explanation:

No of moles : [tex]\frac{given mass}{atomic mass}[/tex]

so the given mass is 42 gm and atomic mass of silicon is 24 when u solve it u get 3/2

Rain is falling at 2.00 inches per hour. How many inches have fallen in 6000.0 seconds?

Answers

It is 2 because 60/30=2

What happens to energy when frequency
is reduced by one half?
Energy is doubled
Energy is squared
Energy is halved
Energy remains constant

Answers

Answer:

Energy is halved.

Explanation:

Energy and Frequency are directly proportional. If frequency decreases, energy increases. If frequency increases, energy increases. If frequency is halved, energy is also halved.

how would you differentiate between acid and bases if the list of their chemical formula is given to you​

Answers

To determine whether a substance is an acid or a base, count the hydrogens on each substance before and after the reaction. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substance is the base (accepts hydrogen ions).
CAN U HEP ME I HAVE A WLEEP APRAFOY AR I CANT GETA WRIS ODNIT PLEASE HWLP

Annalise observes a streak of light in the sky and says she is seeing a shooting star. What is she most likely observing?

a falling star
an asteroid
a meteor
a dwarf planet

Answers

Answer: A Meteor

Explanation:

A streak of light in the sky and says she is seeing a shooting star. She's most likely observing is a meteor. Therefore, option C is correct.

What is a meteor ?

A meteor is an object from space or a meteoroid that touches down on Earth. The air on the space rock creates drag that causes it to become incredibly heated as it falls toward Earth.

When the earth travels through cometary debris during its orbit around the Sun, meteor showers will result. Although the Earth's orbit around the Sun is nearly round, the majority of comets have very elliptical orbits.

A meteoroid becomes a meteor, or a streak of light in the sky, if it gets close enough to Earth and enters its atmosphere. These light striations are sometimes referred to as "shooting stars" due to their appearance. However, stars are not what meteors are.

Thus, option C is correct.

To learn more about meteor, follow the link;

https://brainly.com/question/11504264

#SPJ2

During a change in state, energy is transferred in the form of
heat

light

moisture

motion

Answers

Answer:

heat I think.....

Hope it will help you......

During a change in state, energy is transferred in the form of heat.

Hence, Option (A) is correct.

What is States of matter ?

When energy is added or removed to matter in the form of heat, it changes state to form a state of matter.

A state of matter is defined as one of the ways in which matter can interact with itself to form a homogeneous phase.

Therefore , During a change in state, energy is transferred in the form

of heat. Hence, Option (A) is correct.

Learn more about States of matter here ;

https://brainly.com/question/9402776

#SPJ2

Which is a dominant trait that Mendel observed in pea plant

A. Bumpy pods

B. Short height

C. Yellow seeds

D. White flowers

it is not A

Answers

Answer:

C, yellow seeds

Explanation:

In Mandel's studies, he proved that yellow seeds were to be dominant and green seeds were to be recessive.

Answer:

c. yellow seeds

Explanation:

i toke the test

Formula for all possible isomers of hexane​

Answers

Answer:

1) n-Hexane. 2) 2-Methyl pentane(IUPAC name) or Isohexane(common name). 3) 2,2-Dimethylbutane(IUPAC name) or Neohexane(common name). 4) 3-Methylpentane

Explanation:

a sample of alcohol has a density 0.82 g/ml.what is the mass of 5500 mL of the alcohol

Answers

Answer:

The answer is 4510 g

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

density = 0.82 g/mL

volume = 5500 mL

We have

mass = 0.82 × 5500

We have the final answer as

4510 g

Hope this helps you

What type of reaction is the equation 2NaCl → 2Na +Cl2?

Answers

Answer:

Synthesis reaction

Explanation:

This is a synthesis reaction. When you combine sodium metal (Na) with chlorine gas (Cl), you form sodium chloride or kosher salt (NaCl).

Hope this explanation helps!

Where in equation for photosynthesis does carbon dioxide belong

Answers

Answer:

The equation for photosynthesis is 6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2, so carbon dioxide will be found in the reactant part of the equation.

Helium gas (He) is an element and not a compound. Why is this true?

Answers

If we fill up a balloon with just helium gas, it will only contain helium atoms.

The hottest place in California is Death Valley with a record temperature of 130 ⁰F. Calculate the temperature in ⁰C and K.

Answers

Answer:

54.(4)° C (the 4 in the parentheses means the 4 goes forever), 327.594°K

Explanation:

When you convert 130°F to °C, you will get 54.(4)°C, and the 4 in the parentheses goes forever, and 130°F to °K is 327.594°K, hope it helps!

Explain the term rate of a chemical reaction.

Answers

Answer:

The rate of a reaction is a measure of how quickly a reactant is used up, or a product is formed.

Explanation:

What happens to particles in a sample of liquid when the liquid is heated and cooled?

Answers

If a liquid is heated it’s particles are given more energy and will move faster, however if it is cooled, it’s particles slow down and come closer together.

A horse traveled a distance of 20 miles in 2
hours. What was the horse's speed?

Answers

The horses speed was 10 mph

Answer:

The horses speed was 10 miles per hour.

Explanation:

20/2=10

Hope this helps!

Which statement best describes the difference between veins and arteries? *
veins carry oxygen rich blood back to the heart while arteries carry oxygen poor blood
away from the heart
veins carry oxygen poor blood back to the heart while arteries carry oxygen rich blood
away from the heart.
brings oxygen into the lungs and releases carbon dioxide and water (waste materials)
from the body
arteries carry blood that is carbon dioxide rich to the heart,

Answers

Answer:

Veins carry oxygen poor blood back to the heart while arteries carry oxygen rich blood

Explain the term catalyst and how it affects the rate of a chemical reaction.

Answers

Answer:

Catalyst. A catalyst speeds up a chemical reaction, without being consumed by the reaction. It increases the reaction rate by lowering the activation energy for a reaction. Energy diagrams are useful to illustrate the effect of a catalyst on reaction rates.

Explanation:

Other Questions
simplify the expression (3/5)^3 Domain?Range?Function? Find the quotient.546 What does Libber means? 75 g of a metal is heated to a temperature of 99C. The metal is then placed in a calorimeter containing 145 g of water at a temperature of 25C. The temperature of the water in the calorimeter increase to a final temperature of 28C. What is the specific heat of the metal? Find the value of the expression 3m2 + 2p2 15 when m = 3 and p = 10. (5 points)A.) 27B.) 200C.) 212D.) 225 is this a balanced equation yes or no?Na(g)+2HCl(g)H2+2NaCl(s) giving 70 points please help I only have 20 minutes to get It....... 1.Who is the speaker 2. How does the speaker describe her life in the first several lines 3.What would it be like to climb a strange stair case in the darkMother to son poem Hilary sells bottled water from a small stand by the beach. On the last day of summer vacation, many people are on the beach, and Hilary realizes that she can make a lot more money this day if she hires someone to walk up and down the beach selling water. She finds a college student named Edison and makes him the following offer: They'll each sell water all day and split their earnings (revenue minus the cost of water) equally at the end of the day. Hilary knows that if they both work hard, Edison will earn $90 on the beach and Hilary will earn $240 at her stand, so they will each take home half of their total revenue: If Edison shirks, he'll generate only $60 in earnings. Hilary does not know that Edison estimates his personal cost (or disutility) of working hard as opposed to shirking at $30. Once out of Hilary's sight, Edison faces a dilemma: work hard (put in full effort) or shirk (put in low effort).In terms of Edison's total utility, it is worse for him to ____(work hard or shirk). Taking into account the loss in utility that working hard brings to Edison, Hilary and Edison together ___ (are or are not) better off if Edison shirks instead of working hard.Hilary knows Edison will shirk if unsupervised. She considers hiring her good friend Carrie to keep an eye on Edison. The most Hilary should be willing to pay Carrie to supervise Edison, assuming supervision is sufficient to encourage Edison to work hard, is ____ .a. 55.b. 30.c. 25.d. 20.It turns out that Hilary's friend Carrue is unavilable that day, so Hilary cannot find a reliable person to watch Edison. Which of the following arrangements will ensure that Edison works hard without making Hilary any worse off than she is when Edison shirks?A. Pay Edison $20, regardless of how many bottles of water he sells.B. Allow Edison to keep 75% of the revenue from the bottles of water he sells instead of 50%.C. Allow Edison to keep 57% of the revenue from the bottles of water he sells instead of 50%.D. Make Edison promise to work hard. MARKING BRAINLIEST sports car accelerates from rest to 26.8 m/s (roughly 60 mi/h) in 5.1 seconds. What is the acceleration of the car?One minute after takeoff, a rocket carrying the space shuttle into outer space reaches a speed of 447 m/s. What was the average acceleration of the rocket during that initial minute? Please match the correct person to what they did. Question 7 options: A Puritan Minister banished from Massachusetts for his beliefs and tolerance of other religions and Native Americans. Started the colony of Providence that became the capital of Rhode Island. was hanged for speaking up and not following Puritan rules. spoke against the approved message of the church and was banished from the Massachusetts Colony 1. Roger Williams 2. Anne Hutchinson 3. Mary Dyer this is sience Question 5 (5 points)Which of the following technologies was a reason for the increasing urbanpopulation in the late 1800s?-Radio-Television-Electricity-Shipping HURRY!!! NEED IT FAST ! WILL MARK BRAINLIEST!!! What are the speaker's Reflection on the topic? Select the correct answer.Which property of equality was used to solve this equation?x 5 = -14x 5 + 5 = -14 + 5x = -9A. addition property of equalityB. subtraction property of equalityC. multiplication property of equalityD. division property of equality What should you do if something hurts? O A. Keep doing the exercise O B. Back off or stop the exercise OC. See a doctor if the pain doesn't go away OD. Both B and C ? how are algae cells different from other cells multiple and divide signed numbers Examine the three graphs shown below.Graph 1Graph 2Graph 3Which graphs have same domain?O A Graphs 1, 2 and 3B. Graphs 2 and 3OC. Graphs 1 and 2D. Graphs 1 and 3NEED THIS PLEASE :)