3. A 134.50 g sample of aspirin is made up of 6.03 g of hydrogen, 80.70 g of carbon, and 47.77 g of oxygen. What is the percent by mass of each element in aspirin?

Answer:

Covalent bonds are intermediate in strength and weaker than ionic bonds

Explanation:

Because ionic bonds tend to form a rigid lattice structure that make them more stronger and difficult to remove electrons from them

Answer:

Observe how the force of gravity is directly proportional to the product of the two masses and inversely proportional to the square of the distance of separation.

Explanation:

I think im not sure

Answer:

[tex]\huge\boxed{n = 3.5\ moles}[/tex]

Explanation:

Given :

Mass in grams = m = 42 g

Molar Mass = M = 12

Required:

No. of moles = n = ?

Formula :

m = m / M

Solution:

n = 42 / 12

n = 3.5 moles

Answer:

My best bet is to go with A. All of these

Answer:

Scientific theories are still to be proven while as scientific laws are already proven.

Answer:

Explanation:

The hazard coding system (developed by the National Fire Protection Association, NFPA) helps the individual working with chemicals to know which chemical is a health hazard, inflammable hazard or a reactivity hazard. This makes the individual makes informed decisions while handling such chemicals and also assists the individual or first responders to know what to or not to do in emergency cases or accident (like contact with the skin).

NOTE: The colour code used here have the meanings below

Red: flammability/fire hazard

Blue: health hazard

Yellow: reactivity hazard

White: special hazard

Answer:

Long jump doesn't use the SI unit of measurement

Given :

To Find :

Solution :

Formula for density is :

[tex]\boxed{\sf{Density\ =\ \dfrac{Mass}{Volume}}}[/tex]

⇒0.789 = Mass/1500

⇒ Mass = 0.789 * 1500

⇒ Mass = 1,183.5 g

Hence, Mass of ethyl alcohol is 1,183.5 g.

Answer:

neutralization is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.

the ore copper is extracted from: Chalcopyrite

The process or result of oxidizing or being oxidized.

the action or fact of making a specified thing smaller or less in amount, degree, or size.

I can't answer the other ones. sorry

Answer:

Chemistry course is intended for students who did not take chemistry in high school or who struggled with high school chemistry.

Explanation:

Answer:

Developing the problem

Explanation:

In order to have an experiment or to make the experiment's data useful, you must first find a problem to solve.

Answer:

Kilograms

Explanation:

The metric system denotes their measurements with prefixes (kilo)

Answer:

Vapor pressure of the solution is 22.9 torr at 25°C

Explanation:

When a non volatile solute is added to a pure solvent, the vapour pressure of the mixture decrease regard to the pure solvent following the equation (Raoult's law):

[tex]P_{solution}=X_{solvent}.P^0_{solvent}[/tex]

Where vapour pressure of the pure solvent (Water) is 23.8torr at 25°C.

Mole fraction of water is the ratio between moles of water and total moles in solution. The solution has a mole fraction of water of:

[tex]X_{water}=\frac{8.0Moles_{water}}{0.30mol_{Na_2SO_4}+8.0mol_{water}} = 0.9639[/tex]

Replacing in Raoult's law:

[tex]P_{solution}=0.9639*23.8torr[/tex]

Answer and explanation:

A museum curator is most likely an art conservationist. They would have to determine the age an art piece was developed and ways to preserve older artefacts.

These processes would require the use of chemicals and physical tests, and also research laboratories.

I hope this answer is helpful and clear.

Answer:

B

Explanation:

the formula is d=m/v

both sides xV

dv=m

The equation describes the mass of an object in relation to its volume and density is m=D×V. option B is correct.

The density of a substance is the mass of per unit volume of a substance or any object and the density will be equal to the division of mass of the substance to the volume of the substance and its SI unit will be cubic centimeter.

The equation of mass can be calculated by the help of the formula of density too. so, the mass will be the multiplication of the density of a substance and the volume of the substance and the unit will be kilogram.

Therefore, equation describes the mass of an object in relation to its volume and density is m=D×V. option B is correct.

Learn more about density, here:

https://brainly.com/question/16894337

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Answer:

This is the current method of producing sulphuric acid in the high concentrations needed for industrial processes.

Explanation:

This is the meaning of CONTACT PROCESS.

Hope it helps.

Answer:

True

Explanation:

They do retain their individual properties.

Answer:

Explanation:

▪️[tex] \underline{ \bold{ \sf{ \blue{Chemical \: reaction}}}}[/tex]

⇒The composition , decomposition or displacement of molecules of matter during chemical change is called chemical reaction.

▪️[tex] \underline{ \bold{ \sf{ \purple{ \: Further \: more \: explanation}}}}[/tex]

Various conditions bring about these changes. The chemical reactions are represented by chemicalequation. The compounds or elements that take part in chemical reaction are called reactant. They are written at the left side of an arrow that represent a change while the compound or elements that formed after the chemical change are called product. They are written at the right side of the arrow.

▪️[tex] \underline{ \bold{ \sf{ \purple{For \: example}}}}[/tex]

When nitrogen reacts with hydrogen to form ammonia :

Nitrogen + Hydrogen ⇒ Ammonia

N₂ + 3H₂ ⇒ 2NH₃

Presentation of a chemical reaction in the form of equation is called chemical equation . Chemical equation may be word equations or formula equations.

Hope I helped!

Best regards!!

Answer:

259200

Explanation:

multiply 180×24×60

259,200 seconds

180 × 24 hours = 4320 hours

4320 × 60 minutes = 259200 minutes

259200 × 60 seconds = 15552000 seconds

Answer:

Explanation:

its 2

Answer:

0.947 mol LiOH

Explanation:

2 LiOH  +  CO₂  ⇒  Li₂CO₃  +  H₂O

Convert grams of Li₂CO₃ to moles.  The molar mass is 73.891 g/mol.

(35.0 g Li₂CO₃)/(73.891 g/mol Li₂CO₃) = 0.4737 mol Li₂CO₃

Use the mole ratio between LiOH and Li₂CO₃ to covert moles of Li₂CO₃ to moles of LiOH.

0.4737 mol Li₂CO₃ × (2 mol LiOH/1 mol Li₂CO₃) = 0.9474 mol LiOH

Round for proper significant figures.

0.9474 ≈ 0.947 mol LiOH

please mark my answer brainliest...

condition...pressure remains constant.

1. The temperature at which the volume of gas has been 960 ml is [tex]\rm \bold{19.99\;^\circ C}[/tex].

2. The temperature at which the volume of gas has been [tex]\rm 300\;cm^3[/tex] is [tex]\rm \bold{90^\circ C}[/tex].

1. The gas has been assumed to be an ideal gas. For an ideal gas, the relationship between temperature and volume at constant pressure has been given as:

[tex]\dfrac{V1}{T1}=\dfrac{V2}{T2}[/tex]

Where, the initial volume, [tex]V1=720\;\text {ml}[/tex]

The final volume, [tex]V2=960\;\text {ml}[/tex]

The initial temperature, [tex]T1=15\;^\circ \text C[/tex]

Substituting the values, the final temperature, T2 can be given as:

[tex]\rm \dfrac{720\;ml}{15\;^\circ C}=\dfrac{960\;ml}{\textit{T}2} \\\textit T2=\dfrac{15\;^\circ C}{720\;ml}\;\times\;960\;ml\\\textit T2=19.99\;^\circ C[/tex]

The temperature at which the volume of gas has been 960 ml is [tex]\rm \bold{19.99\;^\circ C}[/tex].

2. The temperature for gas to occupy [tex]\rm 300\;cm^3[/tex] has been given as:

Where, the initial volume, [tex]V1=900\;\rm{cm^3}[/tex]

The final volume, [tex]V2=300\;\rm {cm^3}[/tex]

The initial temperature, [tex]T1=270\;^\circ \text C[/tex]

Substituting the values, the final temperature, T2 can be given as:

[tex]\rm \dfrac{900\;cm^3}{270\;^\circ C}=\dfrac{300\;cm^3}{\textit{T}2} \\\textit T2=\dfrac{270\;^\circ C}{900\;cm^3}\;\times\;300\;cm^3\\\textit T2=90\;^\circ C[/tex]

The temperature at which the volume of gas has been [tex]\rm 300\;cm^3[/tex] is [tex]\rm \bold{90^\circ C}[/tex].

For more information about the volume of gas, refer to the link:

https://brainly.com/question/1218415

Answer: 3.156 * 10^7

Explanation: I do not really understand your question. You answered it yourself!

Scientific notation shortens large numbers. The number right after the decimal point can only be between 1 and 9, which you did correctly. When converting to scientific notation, the exponent of ten is based on how many places you moved the decimal and the direction you moved it (left, positive; right, negative). In this case, the exponent of ten is a positive seven.

You did everything correctly :) Good job!

Answer:

Explanation:

Mechanical energy = Kinetic energy + Potential energy

We shall calculate mechanical energy at different points of time .

Time        Kinetic energy         Potential energy      mechanical energy

   0                     0                                 4                                  4

    2                     2                                  2                                 4

     4                    4                                  0                                  4

      6                   2                                  2                                  4

     8                    0                                   4                                  4

     10                    2                                   2                                 4

and so on ........

Hence we see that total mechanical energy is constant at the value of 4

at all time .

Answer:

1. Gold is valuable because of its high quality physical and chemical properties

2. The gold mines where the state's property in both Egyptian and Roman civilizations

3. The elixir of life is akin to the philosopher stone. It is a chemical portion that when drank, grants eternal life

4. The contribution of alchemists to modern chemistry, includes the formulation of the first ideological periodic table, the distillation process, metalworking, gunpowder, glass, ink, paints, cosmetics and many other innovations

Explanation:

Answer:

the membrane forms an outer boundary of the cell and, as such, holds the cell together. The membrane is also pliable, which means it can move and flex in response to the surrounding environment. The fluid nature of the membrane is important because it allows the cell to survive in various environments.

Explanation:

understand yourself!

Answer:

Answer is (a)

Explanation: