chemistry A Gases unit test

Answer:

24.3

Explanation:

Two containers of gas have the same volume, temperature and pressure. One container has a sample of oxygen gas having a mass of 3.95g. The other container has a gas with a mass of 2.99g. Determine the molar mass of the gas in the second container.

O2 has a molar mass of 16 X 2 =32

the number of moles for O2 is the weight divided by the molar mass or, but since the two container have the same P,V, AND T they have the same number of moles since

PV =nRT

SO

the weight of the gas in the second container divided by its molar mass =

0.123

or

2.99/? = 0.123

so

? = 2.99/o.123 = 24.3

Answer: we can ask simple qs like was it a fair experiment and what he was actually looking for. Other qs include his variables use and that how he has maintained the experiment. Finally we could ask him for his outcome and what it would ahve changed in the near future

Explanation:

not cream, but it I know that coconut oil and honey heals scars in general! I fell once and it was a terrible scar and i places coconut oil at night and the day a little honey and within a few days the scar was unnoticeable. it's sure it will help the same. Remember you are loved and you have so much worth. I am so proud of how far you have come I'm life. <33

Answer:

Again, Microscopes discovered a lot of things in biology like the prokaryotic cells, Bacteria and Archaea, aswell as parts of an organelle/cell.

Answer:

Look at the formula.

Explanation:

Carbon: 10

Hydrogen: 14

Nitrogen: 2

10 + 14 + 2 = 26

Organic, its nicotine

The electron pair geometry around the central iodine in I3- is​ trigonal bipyramidal.

The shapes of molecules is determined by the Valence Shell Electron Pair Repulsion theory (VSEPR). According to this theory, The shape of a molecule depends on the number of electron pairs that surround the valence shell of the central atom in the molecule.

In the structure I3-, the iodine is sp3d hybridized and has a bond angle of 180°. There are three iodine atoms. The central iodine atom is surrounded by two bond pairs and three lone pairs. The  electron pair geometry around the central iodine in I3- is​ trigonal bipyramidal.

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Answer:

I think it's C I think that's the answer

Answer:

The sales clerk can count your nails in 6 groups of 500 nails, or 30 groups of 100 nails to ease the counting process and garauntee a more accurate result.

Explanation:

Answer:

All of them

Explanation: A molecule can be all of them

Answer:

Thermal energy consists of the total internal kinetic energy of an object due to the random motion of its atoms and molecules. It is related to heat and temperature.

Explanation:

Answer:

neutrons = mass number - atomic number

. = 39-19 =20

Answer:

c

Explanation:

mostly it used in movies in the crime scence

Accelerants are flammable solvents such as kerosine, turpentine, gasoline etc. Therefore, the accelerant obtained from the crime scene here, is gasoline.

Accelerants are substances that can combine, blending, or disturb another substance, causing the speed of a natural or artificial chemical process to increase. Accelerants are important in chemistry because they can speed up most chemical reactions.

Accelerants change a chemical bond, accelerate a chemical process, or restore organisms to homeostasis. Accelerants are not always catalysts because they can be consumed by the process.

Flammable gases or solvents such as gasoline, diesel, butane gas, kerosine, turpentine etc are examples of accelerants. Therefore, among the given substances , gasoline is the accelerant.

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Answer:

C. it involves the sharing of electrons

Explanation:

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

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Answer:

solute is coffee solvent is the cream or sugar or milk

Answer:

picture pls

Explanation:

Answer:

The 2 in front of the H is a coefficient.

H and (CO3)2 are reactants.

H2O and CO2 are products.

This reaction is an example of Combustion.

Answer:

CO32-:   reactant

H2O:   product

CO2:   product

The 2 in front of H+:  coefficient

Explanation:

This is the real answer, I got it right on edge or whoever you write it.

The rearrangement produces a more stable tertiary carbocation and the unexpected product.

In the image shown, the substrate is 1-cyclobutylethene. The attack of H2SO4 and water will lead to the conversion of the alkene to an alkanol. Two possible products may be obtained with one being greater than the other.

The unexpected product (Shown in the image attached) is obtained due to rearrangement of the carbocation intermediate. The rearrangement produces a more stable tertiary carbocation and the unexpected product.

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The two processes that help to preserve food are; storing properly in the refrigerator  as well as blanching and canning.

Enzymes are biological catalysts that promote several reactions in the body. The spoilage of food is affected by the enzymes present in food. They act slowly, causing the food to spoil.  

However, there are two way to protect a food from spoilage. These are;

These processes slow down the action of these enzymes that are responsible for the spoilage of food thereby enabling the food to last longer.

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Answer:

38.9%

Explanation:

below, determine the mass percent of Fe3+ in a 0.6450 g sample of iron ore, if 22.40 mL of a 0.1000 M stannous chloride, SnCl2(aq), solution is required to completely react with the Fe3+ present in the ore sample. The chemical equation for the reaction is

2 Fe3+ (aq) + Sn2+ (aq) →2Fe2+ (aq) + Snº+(aq).

O 19.40%

O 6.196%

O 38.79%

O 9.697%

 2 Fe3+ (aq) + Sn2+ (aq) →2Fe2+ (aq) + Snº+(aq).ole of Sn2+

for every mole of Sn2+, tere are 2 moles of Fe3+

so there are 0.00224 X 2= 0.00448 moles Fe3+

iron atomic mass is 56

56 X 0.00448 = 0.251 gm Fe3+

so the mass % of the Fe3+ in the 0.645 gm iron ore sample is

(0.251/0.645) X 100 = 38.9%

Explanation:

Electrical energy: Kinetic energy caused by moving electrons

Example of energy: lighting

Chemical energy: Energy stored in matter

Example of energy: natural gas

Light energy: a kind of kinetic energy that moves in waves and can be seen

Example of energy: stars

Mechanical energy: Is the sum of an object's kinetic energy and potential energy

Example of energy: dart guns

Answer: Q1.) electrical enegry

      Q2.) light energy  

                Q3.) chemical energy

                Q4.) mechanical energy

Explanation:

Q.1) kinetic energy caused by moving electrons ?

eletrical energy

Q2.) what kind of kinetic energy that moves in waves and can been seen?

       light energy  

Q3.)  energy stored in matter ?

        chemical energy

Q4.) the sum of an object's kinetic and potential energy ?

        mechanical energy

The physical adaptation among the option that increases an organisms

chances of finding a suitable habitat is the long legs of wading birds

An adaptation is a characteristic that helps an animal survive in its habitat.

Any animal who successfully survives on land or water must have behavioural

and physical trait or attributes or adaptation that assist it to achieve those

goals.

This physical adaptation might be body growth, body covering during

weather change, body functioning or even body parts.

The physical adaptation among the option that increases an organisms

chances of finding a suitable habitat is the long legs of wading birds.

The long legs of wading birds assist them to find a suitable habitat. The long

legs can move through shallow water without wetting their feathers.

There long leg give them better eye sight to search for food and suitable

habitats.

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Answer:

Explanation:

Al2(SO4)3 + 3BaCl2 ====> 2AlCl3 + 3BaSO4

Sorry forgot to say that it is a double replacement. The Ba goes where there Aluminum is and the Aluminum goes where the Barium is.

The internal balance numbers come from the fact that the ions and complex ions have different valance numbers.

Answer:

C

Explanation:

When we put a charged object near an uncharged object, it produces opposite charges in the near end of the uncharged object by electric induction. ... If we bring it near an uncharged sphere, the sphere forms negative charge near the glass rod, and positive charged on the end away from glass rod

Answer:

the fractions obtained are not of acceptable purity

Explanation:

=Spectral lines are produced by transitions of electrons within atoms or ions. As the electrons move closer to or farther from the nucleus of an atom (or of an ion), energy in the form of light (or other radiation) is emitted or absorbed.…

Answer:

Spectral lines are produced by transitions of electrons within atoms or ions

Answer:   Germanium has a cubic closest packed structure as a solid. Assuming that germanium has an atomic radius of 159 pm, calculate the density of solid germanium. __________ g/cm3 b.) Germanium has a face-centered cubic unit cell. The density of germanium is 5.32 g/cm3. Calculate a value for the atomic radius of germanium. ___________pm c.) You are given a small bar of an unknown metal X. You find the density of the metal to be 12.0 g/cm3. An X-ray diffraction experiment measures the edge of the face-centered cubic unit cell as 3.89 â„« (1 â„« = 1 ✕ 10−10 m). Identify X.

Explanation:

The density of Germanium is equal to 5.30g/cm^3

Data Given;

For a cubic closest packed = 4r

[tex]4r = \sqrt{2a} \\ a = \frac{4}{\sqrt{2} }r\\ a = \frac{4}{2}*159*10^-^1^0\\ a = 4.50*10^-^8cm[/tex]

The density of the cube is given as the ratio between the mass and volume. But in this case, we have a formula

[tex]d = \frac{Zm}{Na^3}\\ d = \frac{4*72.64}{6.023*10^2^3*9.09*10^-^2^3}\\ d = 5.30 g/cm^3[/tex]

NB;

The density of the cube is equal to 5.30g/cm^3

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Answer:

Increase in the melting point, boiling point, solubility, and viscosity of many compounds can be explained by the concept of hydrogen bonding

Explanation:

melting point- when does the solid melt to a liquid

boiling point - a temperature when a liquid will turn into a gas

solubility -solubility is ability of a substance, the solute, to form a solution with another substance

viscosity- Viscosity is a measure of a fluid's resistance to flow. It describes the internal friction of a moving fluid. ( basically how thick it is)

Answer:

Melting point, boiling point, solubillity and viscosity of many substances

Hope this helped you

Answer:

Hey mate....

Explanation:

This is ur answer....

They tend to be small in size and there are many of them. The primary consumers are herbivores (vegetarians), Because of this inefficiency, there is only enough food for a few top level consumers, but there is lots of food for herbivores lower down on the food chain. There are fewer consumers than producers.

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Answer:

The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.