А group of students are investigating what happens when you put different
temperatures of water together. In this investigation, they have set up a vial
of colorless room-temperature water and are adding purple hot water at the
bottom of the vial, using a pipette
What do you predict happens in the first 5 seconds.

Answer:

C02+2CL2 = O2+CCL4​

Explanation:

the co2 gave its carbon atom to the CL2 + CCL4​

Answer:

MnO₂ is limiting reactant

7.68g is theoretical yield

73.6% is percent yield

Explanation:

The reaction of the question is:

3MnO₂ + 4Al → 2Al₂O₃ + 3Mn

To determine limiting reactant we need to convert each reactant to moles and, based on the chemical equation determine the moles you need of the other reactant for a complete reaction:

Moles MnO₂ -Molar mass: 86.937g/mol-:

9.81g * (1mol / 86.937g) = 0.113 moles

Moles Al -Molar mass: 26.98g/mol-:

6.54g * (1mol / 26.98g) = 0.242 moles

For a complete reaction of 0.242 moles of Aluminium you will require:

0.242mol Al * (3MnO₂ / 4Al) = 0.182 moles of MnO₂

As there are just 0.113moles of MnO₂, MnO₂ is limiting reactant

Now, with limiting reactant we need to determine theoretical moles and grams of Al₂O₃ produced:

Moles:

0.113 moles MnO₂ * (2Al₂O₃ / 3MnO₂) = 0.0753 moles Al₂O₃

Grams (Molar mass: 101.96g/mol):

0.0753 moles Al₂O₃ * (101.96g/mol) = 7.68g is theoretical yield

Percent yield is 100 times the ratio between actual yield (5.65g) and theoretical yield:

5.65g/7.68g * 100 =

Answer:

C. Response to environment

Answer:

The properties of matter include any traits that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more. We need to study all these traits since every single object around us, including us, is made of matter. Without matter we wouldn't exist; it would be infinite darkness everywhere.

Answer:

[tex]C_2H_6[/tex]

Explanation:

Hello.

In this case, we can see that the mass of carbon of the unknown compound comes from the yielded mass of carbon dioxide, thus, we compute the moles of carbon as follows:

[tex]m_C=10.2gCO_2*\frac{1molCO_2}{44gCO_2}*\frac{1mol C}{1molCO_2}=0.232 molC[/tex]

Moreover, the mass of hydrogen comes from the yielded water, therefore we can also compute the moles of water:

[tex]m_H=6.3gH_2O*\frac{1molH_2O}{18gH_2O}*\frac{2molH_2}{1molH_2O} =0.7molH[/tex]

Then, to find the subscripts in the empirical formula, we divide by the moles of carbon as the smallest:

[tex]C:\frac{0.232}{0.232}=1\\ \\H:\frac{0.7}{0.232}=3[/tex]

Whose molar mass is:

[tex]M_{CH_3}=12+1*3=15g/mol[/tex]

Thus, the ratio of the molecular formula to the empirical formula is:

[tex]\frac{30}{15}=2[/tex]

Therefore, the molecular formula is twice the empirical formula:

[tex]C_2H_6[/tex]

Which is actually ethane.

Regards.

Answer:

I need to se the options

Answer:PubChem CID: 32051

Explanation:Molecular Formula: Zn+2

Synonyms:  

zinc ion

zinc(2+)

Zinc cation

Zinc, ion (Zn2+)

Zn2+

More...

Molecular Weight:  

65.4 g/mol

Dates:  

Modify:

2020-10-20

Create:

2005-06-08

Answer:

its b.

Explanation:

Answer:

an atom and inside the atom are protons electrons and nuetrons

Explanation:

Answer:

An Atom

Explanation:

An atom is the most smallest particle of matter, you can't see with the most powerful telescopes or microscopes

Answer: A = 1560

               B = 1.6

Explanation: brainlest please

Answer:

b.) 100 meters c.) 6 seconds d.) 16.6 e.) 16.6m/s

Explanation:

Answer:wait nvm i was right its zirconium

the answer should be zirconium

Answer:

oxygen

Explanation:

periodic table

Scientists use a two-name system called a Binomial Naming System. Scientists name animals and plants using the system that describes the genus and species of the organism. The first word is the genus and the second is the species.

Answer:

Explanation: Geography · College. +5 pts ... Answer. 1.9/5. 16. Girly1004. Ambitious. 1 answer. 4 people helped ... are places that show evidence of a massive ice sheet that existed around 250 million years ago.

The outer core is the layer of Earth creates a magnetic field and shields us from the Sun's destructive solar wind.

It is called a magnetic field to a space in which magnetic phenomena take place due to the influence of a body with properties of electric charges.

The earth's magnetic field is mainly produced by the electric currents that occur in the outer core, liquid in nature, which is composed of highly conductive cast iron.

As the center of the Earth cools, part of the iron contained in the fluid outer core solidifies and becomes part of the inner core.

The outer core changes its chemical composition and becomes less dense, generating convective currents.

This process, together with the Coriolis effect (product of the Earth's rotation) generates strong helical convection currents that align with the axis of rotation.

The Earth is mostly protected from the solar wind, a stream of energetic charged particles emanating from the Sun, by its magnetic field, which deflects most of the charged particles.

These particles would destroy the ozone layer, which protects the Earth from harmful ultraviolet rays.

Therefore, we can conclude that the outer core is the layer of Earth creates a magnetic field and shields us from the Sun's destructive solar wind.

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Answer:

3.4

Explanation:

Nitric acid and nitrogen monoxide react to form nitrogen dioxide and water, like this: 2 HNO₃(aq) + NO(g) ⇄ 3 NO₂(g) + H₂O(l)

At a certain temperature, a chemist finds that a 9.5L reaction vessel containing a mixture of nitric acid, nitrogen monoxide, nitrogen dioxide, and water at equilibrium has the following composition:

compound amount

HNO₃ 15.5g

NO 16.6g

NO₂ 22.5g

H₂O 189.0g

Calculate the value of the equilibrium constant Kc for this reaction. Round your answer to 2 significant digits.

Step 1: Write the balanced equation.

2 HNO₃(aq) + NO(g) ⇄ 3 NO₂(g) + H₂O(l)

Step 2: Calculate the molar concentration of the species at equilibrium

We will use the following expression.

M = mass of solute / molar mass of solute × liters of solution

[HNO₃] = 15.5g / 63.01 g/mol × 9.5 L = 0.026 M

[NO] = 16.6g  / 30.01 g/mol × 9.5 L = 0.058 M

[NO₂] = 22.5g  / 46.01 g/mol × 9.5 L = 0.051 M

We do not calculate the molarity of water because it is a pure liquid and will not be included in the equilibrium constant.

Step 3: Calculate the equilibrium constant (Kc)

Kc = [NO₂]³/[HNO₃]²×[NO]

Kc = 0.051³/0.026²×0.058

Kc = 3.4

Rutherford's results declined the results of Thomson's model, the correct option is C.

Atomic Models are the scientific theories proposed to determine the structure of an atom.

There are mainly 5 theories proposed for atomic models.

1. John Dalton's Atomic Model: An atom is the basic building block of all physical entities in the universe.

2. Plum Pudding Model, created by J.J. Thomson, uses the comparison of plum pudding, where the positive charge is uniformly dispersed throughout and the negative charge is randomly sprinkled on top, to explain how subatomic particles are structured.

3. Rutherford's model: proved the presence of a nucleus.

4.Niel Bohr's model: Arrangement of electrons in shells.

5. Erwin Schrodinger's model is also called as Quantum Model.

In J.J. Thomson's model, the equal distribution of positive and negative charges is proposed while,

Rutherford's theory declines this arrangement and proposes that the positively charged nucleus occupies a very small part and there is empty space in the atom.

So, Rutherford’s results suggested that the model proposed by Thomson was based on false research and required.

To know more about Atomic Models

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Answer: The answer is option C. (It balances the equation, ensuring each side of the reaction has an equal number of atoms.)

Explanation:

Answer:

All of the above are correct.

Explanation:

The Flame Test Shortcomings

Small quantities of most molecules can not be measured by the examination.

The signal's intensity ranges from one test to the next.

The test findings are impaired by impurities or toxins.

The test is not capable of differentiating between all components.

Answer:

Its B

Explanation:

When testing with the human body i think

Answer:

Silver does have a mass of 107.87.

Explanation:

Answer:

A

Explanation:

it is round up to 20

Answer:

20 is the answer (A)

Explanation:

Neon/Atomic mass

20.1797 u

this is approximately 20 so 20 is the answer (A)

hope this helps!

Answer:

The correct answer is - option C.  I and Ill only.

Explanation:

One never tastes a unknown chemical in chemistry lab especialy a liquid that can be hazardous. Melting test is for solid as a solution is already a liquid state so melting test can not be perform on it.

The two test can be perform on given sample that are color comparison and boiling test to check if it is substance or a mixture. A misture is prepared from mixing different kind of compounds that can give different kind of color  while a particular substance give a uniform color always or remain colorless.

Boiling test can be helpful in distinguish a mixture from a substance as a particular sybstance always give a particular boiling point but mixture can be varry and depend of the coponents mixed together

Pouring cold water into your hot coffee is convection. Therefore, option B is correct.

Convection can be explained as the transfer of heat from one place to another because of the movement of fluid. Convective heat transfer can be defined as the combined processes of conduction and advection.

Gases as well as liquids are not good conductors of heat under normal pressure and temperature conditions, but they can easily transfer heat from one region to another region.

Convection takes place through diffusion but does not take place in solids substances, as there is no movement of constituent particles takes place. The diffusion of heat energy that occurs in solids is called thermal conduction.

Heat energy transfer that takes place between a surface and a liquid when they come in contact with the surface is called convection heat transfer.  Therefore, heat transfer takes place through convection when pouring cold water into hot coffee.

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Answer:

Graham's law of effusion was formulated by Scottish physical chemist Thomas Graham in 1848. Graham found experimentally that the rate of effusion of a gas is inversely proportional to the square root of the mass of its particles. This formula can be written as: , where: Rate₁ is the rate of effusion for the first gas.

Explanation:

r1 = rate of effusion for gas 1

r2 = rate of effusion for gas 2

M1 = molar mass of gas 1

M2 = molar mass of gas 2

Answer:

See below

Explanation:

INdependent = amount of med given

Dependent = recovery time    <==== this 'depends' on the amount of medicine given

Answer:

C) Covalent bonds come about because of a sharing of electrons; ionic bonds do not.

Explanation:

There are two main types of chemical bonds- covalent and ionic/electrovalent bonds.

Ionic bond: Ionic or electrovalent bonds are characterized by the transfer of electrons from electropositive atoms (metals) to electronegative atoms (non-metals). The metal atoms after donating their electrons become positively charged ions (cations) while the non-metal atoms after accepting electrons become negatively charged ions (anions). Strong electrostatic forces of attraction constitutes ionic bonds.

Covalent bond: Covalent bonds are formed by the sharing of electrons by the atoms involved in the bond; usually between atoms of comparable electronegativities or atoms of the same element. The shared electrons are contributed by each of the atoms involved in the bonding or may be contributed by only one of the atoms. In covalent bonding, molecules rather than ions are formed.