which group of substances are elements?
A.Air,water,cooking oil
B.carbondioxide,water,table salt
C.carbon,hydrogen,oxygen
D.rock,soil,iron ore​

Answers

Answer 1

Answer:

C

Explanation:

(A+B) are compounds and D is mixtures


Related Questions

Planets that will sink in water ?

Answers

Answer:

Any planet that is made up of mostly rock.

in an experiment it was found that the total charge on an oil
drop was 5.93 X 10^-18 C How many negative charges does
the drop contain? (#51)

Answers

Answer:

37 negative charges.

Explanation:

We're being asked to determine how many negative charges a drop contains from an oil drop experiment where the total charge was 5.93x10-18 C. The drop contains 37 negative charges.

It was stated and identified that we are to attempt question #51 alone.

From the given information;

The total charge on an oil drop = 5.93 × 10⁻¹⁸ C

According to Oil drop experiment carried out by Robert Milliken in (1910);

In the oil drop laboratory experiment, It was possible for Him to substitute oil for water (because water quickly evaporate). Robert Milikan adjusted the electrical voltage among the two metal plates while the oil drop continues to drop until it stopped. When the drop was stopped, the gravitational downward force on the oil drop was equivalent to the electrical upward force on the charges thereby enabling Robert Millikan to be able to estimate the electrical charge drop.

Robert Milliken identified that the magnitude of a single negative electron charge is:

= 1.6 × 10⁻¹⁹ C

If in an experiment, the total charge =  5.93 × 10⁻¹⁸ C

Then;

The number of negative charges in the oil drop can be calculated as;

[tex]\mathbf{=\dfrac{5.93 \times 10^{-18}}{1.6 \times 10^{-19}}}[/tex]

= 37.063 negative charges

Therefore, we can conclude that the numbers of negative charges contained in the total drop = 37.063.

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Doing Calculations The metal thallium occurs naturally as 30 percent thallium-203 and 70
percent thallium-205. Calculate the atomic mass of thallium. Enter your numerical answer in
the blank provided please help

Answers

Answer:

Average atomic mass of thallium = 204.4 amu.

Explanation:

Given data:

Abundance of thallium-203 = 30%

Abundance of thallium-205 = 70%

Average atomic mass = ?

Solution:

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

Average atomic mass of thallium = (30%×203)+(70%×205) /100

Average atomic mass of thallium =  6090 + 14350 / 100

Average atomic mass of thallium = 20440 / 100

Average atomic mass of thallium = 204.4 amu.

What is the solution to the equation below, rounded to the correct number of Significant figures? 4700 L - 281.4 L = ___ L

Answers

Answer:

46

Explanation:

Answer: 4418.6

Explanation:

What is the oxidation number of Oxygen?

Answers

-1

........... ..............

ASAP. I will give brainlies to right answer!!! Three grams of the same substance in different phases are stored in three different containers. Each container is barely large enough to hold the substance.

Which statement can be known about the behavior of the atoms in each container?

The atoms in the solid would be moving vigorously around the container.
The atoms in the liquid would be vibrating in position.
The atoms in the solid would be vibrating in position.
The atoms in the gas would be moving slowly around the container.

Answers

Answer:

The atoms in the solid would be vibrating in position.

Explanation:

i took the test

Three grams of the same substance in different phases are stored in three different containers. Each container is barely large enough to hold the substance. Therefore, the correct option is option B.

What is atom?

Atom, the smallest unit of matter that may be separated without releasing electrically charged particles. It is also the tiniest unit of matter with the characteristics of a chemical substance. As a result, the atomic is the fundamental building component of chemistry.

The majority of the molecule is empty space. The rest of the structure is made up of a positive-charged nucleus of neutrons and protons surrounding by a swarm of negative-charged electrons. In comparison to electrons, the lightest charge particles in nature, nuclear nucleus is small yet dense. The atoms in the liquid would be vibrating in position.

Therefore, the correct option is option B.

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Solid sodium is reacted with chlorine gas and a crystalline solid was formed. The crystalline solid is evidence that
A. The sodium was broken down into tiny pieces by the chlorine.
B. The reaction caused impurities to fall out.
C. Elements bond in a multitude of ways to make compounds.
D. The chlorine solidified.

Answers

Answer:

C. Elements bond in a multitude of ways to make compounds.

Determine the mass defect for the following atom. The mass of a 20 Ne atom is 19.992 44 amu.​

Answers

Answer:

I will not consider electronic mass here. We know (the masses should have been provided in the question!) that the neutron mass is

1.008701

amu

and the proton mass is

1.007316

amu

.

Explanation:

Question answered

PLS HELP ITS URGENT
Some plant cells need energy to carry nutrients across the cell membrane. Which type of energy transformation does these plant cells use to bring the nutrient molecule inside the cell membrane?

thermal energy to kinetic energy

potential energy to light energy

chemical energy to kinetic energy

kinetic energy to potential energy

Answers

Answer:

Answer

The answer is option 4

The energy transformation during nutrients transportation across the cell membrane is transformation from chemical energy to kinetic energy, where the uphill and downhill movements of molecules based on concentration gradient carries the whole process.

What is energy transformation?

The total energy in a system is always conserved. However, one form of energy can be transformed into another form. For example we uses electrical devices such as bulbs fan etc, wherever the energy transformation is getting way from electrical energy to light or mechanical energy.

In plant cells nutrient molecules and ions are balanced inside and outside the cell and hence they are transported across the cell membrane by a concentration gradient with a chemical energy produced by the molecules.

The chemical energy inside of the ions and molecules converts to kinetic energy to transport itself through downhill and uphill mechanisms with aid of various enzymes and electron channels.

To find more on energy transformation, refer here:

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What is the frequency of a photon of light (in Hz) that has an energy of 2.50 x 10-18 J?

Answers

Answer:

The answer is

[tex]3.77 \times {10}^{15} \: \: \: Hz[/tex]

Explanation:

The frequency of the photon can be found by using the formula

[tex]f = \frac{E}{h} \\ [/tex]

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question

E = 2.50 × 10^-18 J

So we have

[tex]f = \frac{2.50 \times {10}^{ - 18} }{6.626 \times {10}^{ - 34} } \\ [/tex]

We have the final answer as

[tex]3.77 \times {10}^{15} \: \: \: Hz[/tex]

Hope this helps you

1)Fluorine-21 has a half life of approximately 5 seconds. If you start with 100g, how much
would remain after 10 seconds?
What’s the answr

Answers

Answer:

25 g

Explanation:

The following data were obtained from the question:

Half life (t½) = 5 s

Original amount (N₀) = 100 g

Time (t) = 10 s

Amount remaining (N) =..?

Next, we shall determine the decay constant for the disintegration. This can be obtained as follow:

Half life (t½) = 5 s

Decay constant (K) =.?

K = 0.693 / t½

K = 0.693 / 5

K = 0.1386 s¯¹

Finally, we shall determine the amount of the isotope that remained after 10 s as follow:

Original amount (N₀) = 100 g

Time (t) = 10 s

Decay (K) = 0.1386 s¯¹

Amount remaining (N) =..?

Log (N₀/N) = kt /2.303

Log (100/N) = (0.1386 × 10) / 2.303

Log (100/N) = 1.386 / 2.303

Log (100/N) = 0.6018

Take the anti log of 0.6018

100/N = antilog (0.6018)

100/N = 4

Cross multiply

100 = N × 4

Divide both side by 4

N = 100/4

N = 25 g

Therefore, the amount remaining after 10 s is 25 g

why is water a neutral substance

Answers

Answer: Water is considered neutral because the concentration of hydrogen and hydroxide ions is the same

Explanation:

If the titration of 0.8094 g of 100% pure
KHP requires 40.25 mL of NaOH, what
is the concentration of the NaOH
solution? Remember KHP is potassium
hydrogen phthalate, KHC2H4O4. Show
this calculation in your lab notebook.

Answers

Answer:

Explanation:

molecular weight of potassium hydrogen phthalate = 204

.8094 g of KHP = .8094 / 204 = 3.967 x 10⁻³ moles

3.967 x 10⁻³ moles of KHP must have reacted with 3.967 x 10⁻³ moles of NaOH

concentration of NaOH = 3.967 x 10⁻³ / 40.25 x 10⁻³

= .098 M .

A molecule that has a linear shape has two electron domains around the central atom. How
many lone pairs of electrons are present around the central atom?
A. zero
B. one
C. two
D. three

Answers

Answer:

C I think.

Explanation:

Sorry if it's wrong :(

A) zero
hope this helps x
can i have brainliest plz x

What is the total pressure of a container in kpa if the partial pressures are 1.25 atm and 66.7 psi?

Answers

Answer:

586 kpa(kilopascal/1000 pascals)

Explanation:

given 1.24 atm(standard atmosphere), and 66.7 psi(pound force per square inch).

To find the total pressure we should use dalton's law of partial pressures which is the sum of the pressures of each individual gas.

then we convert them to pascals and divide by 1000 to get the measurement in kilopascal.

knowing that 1 atmosphere is proportional to around 14.696 psi. We can multiply our given measure of atm by that and sum it by psi like so. 1.24×14.6959 = 18.22298.

Then,

18.22298+ 66.7 = 84.92298

psi.

Since 1 psi is proportional to around 6894.76 pascals. 1 psi will be 68.9476 kilopascal. 84.92298 * 6.89476 = 585.523336 ≈ 586

Distinguishing solutions and colloids

Which techniques would be best for separating the solute from the solvent in a solution ?

Answers

Answer:

Distillation will be the best method for the separation of solute from the solvent in a solution.

Explanation:

Tobacco use: The _____ _______ cause of ______ death

Answers

Answer:

Tobacco use: The most preventable cause of cancer death

Explanation:

cancer might not be right

WILL mark Brainliest

Answers

Answer:

Ok what question

Explanation:

uhh what question do you need help with?

The water cycle would not be possible without ______ and ________.
a. evaporation; condensation
b. gravity; sun
c. precipitation; rain
d. gravity; precipitation

Answers

The answer is B and I’m typing more cuz I need 20 characters

Which diagram represents a physical change,only?

Answers

There is no diagram

How would you expect a positive particle approaching another positive particle to behave?

Answers

Answer:

They would produce a repulsive force to another

Explanation:

A positive particle approaching another positive particle will repulse it.

According to coulomb's law "like charges repel one another and unlike charges attract".

A charge is an intrinsic property of any matter.

When like charges e.g positive and positive or negative and negative charges are in the vicinity of one another, they repel each other.

When unlike charges; positive and negative are brought together, they simply attract one another.

Therefore, we expect that a positive particle approaching another positive particle will repel one another.  

When a positive particle approaches another positive particle, the two particles repel or move away from each other.

In electrostatics we know that like charges repel while unlike charges attract. Therefore when we have two like charges, they simply move away from each other. This is known as repulsion of charges.

Hence, two positive charges approaching each other will simply move away and repel each other according to the laws of electrostatics.

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Lithium metal will react with aqueous aluminum sulfate. Write and balance the equation for this rxn, and then determine how many g of aluminum will result from 68.6 g lithium reacting with aluminum sulfate in excess.

Answers

Answer:

88.2 gram of aluminium .

Explanation:

6Li + Al₂ ( SO₄)₃ = 3Li₂SO₄ + 2Al

6 x 7 g                                    2 x 27 g

42 gram of lithium produces     54 gram of aluminium

68.6 gram of lithium will produce   88.2 gram of aluminium .

88.2 gram of aluminium will be produced.        

"During a chemical reaction, you must have the same amount of substance
on both sides of the quation" This statement is the definition for the *

Answers

Answer:

This statement is the definition of law of conservation of mass.

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O   →   C₆H₁₂O₆ +  6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

Let us consider the general chemical reaction.

A   +   B    →      C

5g +  5g           10g

What is the major threats to Philippines' aquatic biomes? As a student how can you help in preventing or combating this/these threat/s?​

Answers

Answer:

Overfishing

Explanation:

The aquatic biomes of the Philippines' are rich in coral reefs and other aquatic animals but they are under major threat due to pollution and overfishing.

Pollution is caused by industrial factories and coastal developments. Industrial factories fed all it waste in the aquatic biomes and coastal developments due to the increasing population of the Philippines causes mass pollution by the dumping of waste materials and sedimentation.

Overfishing exploits the fish species and also affects the food cycle in aquatic biomes.

As a student, we can spread awareness by conducting awareness campaigns and can take the help of news channels to let people know the consequences of aquatic biomes exploitation. We can also use social media which is popular nowadays to introduce facts about the causes and consequences of aquatic biomes exploitation.

Explain how scientists know the composition of the bottom layer of the cust?

Answers

Answer: Scientists learn about the layers deep within the Earth's crust by studying how seismic waves travel through the Earth. If there is an earthquake somewhere, seismagraphs in many locations will record it.

HOPED IT HELPED IF IT DID CAN I HAVE BRAINLIEST AND GOOD LUCK.

How many moles are in 2.16 x 1026 atoms of magnesium?*

Answers

Answer:

The answer is 358.80 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{2.16 \times {10}^{26} }{6.02 \times {10}^{23} } \\ = 358.80398671...[/tex]

We have the final answer as

358.80 moles

Hope this helps you

Help PlS AFAP and thank you so much

Answers

the answer is B transfer thru direct contact

As a seed plant grows, the roots grow downward due to the force of​

Answers

Answer:

As a seed plant grows, the roots grow downward due to the force of​  Gravity

Explanation:

A seed is planted upside-down, but the roots still grow in the direction of gravity.

Answer:

Obviously, it's gravity

Explanation:

Because when saying moving downward, it means an object is moving down, and that is caused by gravity.If there is no gravity then it is called 0 gravity, meaning free from the ground.

Is br a magnetic or non magnetic

Answers

Answer: Non-magnetic

Explanation:

Answer:

br is a non magnetic. hope this helps.

Which of the elements listed below would
require the least amount of energy to remove an
electron?
Beryllium
Calcium
Lithium
Sodium?

Answers

Answer:

Lithium would require the least amount of energy to remove an electron

Answer:

The answer is actually sodium

Explanation:

Lithium actually requires more than sodium.

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Does abbreviated and condensed mean the same thing The Gulf of Mexico is located at number __ on the map above and the Pacific Ocean is located at number__ Do you think it is important for people to believe in legends like King Arthur and explain why. so what would you do if your friend expose you for being on brainly? A line segment has endpoints at (-1, 4) and (4,1). Which reflection will produce an image with endpoints at (-4,1)and (-1,-4)?a reflection of the line segment across the x-axisO a reflection of the line segment across the y-axisO a reflection of the line segment across the line y = xO a reflection of the line segment across the line y = -X the empire state building weighs about 7.3X10 to the 8 power (pounds) the world trade center building weighs about 88,200,000 pounds. whats is total weight, in pounds, of these two buildings? Expressing your answer in scientific notation in the form aX10 to the power of B, what are the values of A and B? please help me 60 points please show all work this is due in 15 minutes5x-(3x-6)=182(3x-4)=102x+7=5x+16x/3-8=-23x 6 = -12x/-3=8 if each side of the cube shown above has the same length as the measured side what is the approximate volume of the cube Simplify the expression.(7x4)?(7x4)2 = What are the negative and positive effects of cultural relativism? Helps please quick geometry Use the formula to determine the number of black squares in the first five figures of the Sierpinski Carpet given by the partial sum:For this sum:a1 = 1 r = 8n = 5The number of squares in the first five figures is = 4681 The number math problems Michel can solve varies directly with the amount of time he spends solving math problems. Michel can solve 8 problems in 5 minutes? How many math problems can Michel solve in 25 minutes? Which statements accurately describe physical characteristics of Mesopotamia? Select all correct answers. A) It is accessible to the Mediterranean Sea. B) It is accessible to the Persian Gulf by way of rivers. C) It is located between two rivers. D)It has ample rainfall all year long. An element that is in the same period as nitrogen is _________Group of answer choicesheliumneonargonsodium there are 9 water bottles in devin's fridge. he adds two cases that are each missing a bottle of water. when he is done, there are 31 bottles in the fridge. how many bottles are in a case? What describes Haiti's leadership in the 1850's? what is the chang in temperture from -24 to 15? 1. If all other things remain equal, which of the following changes to a closed circuit would result in increased resistance to the flow of electric current?Correct Answer: A) Reducing the thickness of the conductorB) Replacing the conductor with a more conductive materialIncorrect Response: C) Reducing the length of the conductorD) Reducing the temperature of the conductor 2. What term refers to producing magnetism by placing a body within a magnetic field?A) PolarizationB) Natural magnetismC) Incorrect Response: Artificial magnetismD) Correct Answer: Induced magnetism3. What two things must exist for an electric current to be produced?A) A negatively charged electrode and a positively charged electrodeB) Incorrect Response: A pair of highly conductive materials and a conducting path between themC) Correct Answer: An electric potential between two bodies and a conducting path joining the bodiesD) A source of voltage and an open circuit4. If all other things remain equal, which of the following changes to a closed circuit would result in increased resistance to the flow of electric current?A) Correct Answer: Reducing the thickness of the conductorB) Replacing the conductor with a more conductive materialC) Incorrect Response: Reducing the length of the conductorD) Reducing the temperature of the conductor5. Three components in a parallel circuit have individual resistances of r1, r2, and r3. What formula can you use to determine the total resistance of the circuit?A) 1/R= r1 + r2 + r3B) Incorrect Response: R= 1/r1 + 1/r2 + 1/r3C) Correct Answer: 1/R= 1/r1 + 1/r2 + 1/r3D) R= r1 + r2 + r36. Which of the following materials commonly used in electronic devices is classified as a semiconductor?A) Correct Answer: SiliconB) Incorrect Response: CopperC) GlassD) Plastic7. Which of the following explains why your hair stands on end when you rub it with a balloon?A) The balloon creates friction, which sticks your hair to it.B) Correct Answer: Electrons from your hair jump to the balloon, causing it to become negatively charged on one side.C) Incorrect Response: Protons from your hair jump to the balloon, causing it to become negatively charged on one side.D) Protons from the balloon jump to your hair, causing it to become negatively charged. 6 divided by the sum of x and 4 equals the quotient of 2 and the difference of x and 4