CHEMISTRY HIGH SCHOOL

Write briefly on scientific method

Answers

Answer 1

Answer:

Answer:

Explanation:

a five step process that scientists use when they do their work.

1. ask a question

2. form a (testable) hypothesis or educated guess

3. conduct a controlled experiment (to test the hypothesis)

4. record & analyze results

5. develop a conclusion --> use the data from the experiment to see if it supports your hypothesis

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Round each of the following measurements to the number of significant figuresindicated.67,029 to three significant figures0.15 to one significant figure52.8005 to five significant figures3.17497 to three significant figures
Which of the following conditions would most likely affect the rate of a chemical reaction? A. Increasing the number of reaction steps B. Decreasing the size of the reaction vessel C. Decreasing the amount of air in the reaction vessel D. Increasing the concentration of reactants

Consider this molecular‑level representation of a mixture of gases. There are three gas particles containing two spheres. There are six gas particles containing a single sphere of a different color. There are five gas particles containing a single sphere of a third color. If the partial pressure of the diatomic gas is 0.330 atm, what is the total pressure?

Answers

The total pressure of the gaseous mixture is 1.57 atm.

The mixture of the gases consists of 3 diatomic molecules, 6 monoatomic molecules, and 5 other monoatomic molecules.

The total number of molecules in the mixture are:

$\rm Total\;molecules\;=\;3+6+5\nTotal\;molecules\;=\;14$

Computation for the total pressure of the gas

The total pressure of a gas by Raoult's law is given as:

$\rm Total\;pressure=(Partial\;pressure)/(Mole\;fraction)$

The partial pressure of the diatomic gas is 0.330 atm.

The mole fraction of the diatomic gas is given as:

$\rm Mole\;fraction=(Molecules\;of\;diatomic\;gas)/(Total\;molecules) \n\nMole\;fraction=(3)/(14)\n\n Mole\;fraction=0.2$

The mole fraction of the diatomic gas is 0.2.

The total pressure of the gas is given as:

$\rm Total\;pressure=(0.330)/(0.2)\;atm\n\n Total\;pressure=1.57\;atm$

The total pressure of the gaseous mixture is 1.57 atm.

Learn more about the pressure of the gas, here:

brainly.com/question/2224724

Explanation:

The given data is as follows.

Number of particles of diatomic gas = 3

Number of particles of monoatomic gas = 6

Number of particles of another monoatomic gas = 5

Therefore, total number of particles or moles present will be as follows.

3 + 6 + 5 = 14

As we know that, mole fraction = $\frac{\text{moles of given substance}}{\text{total no. of moles}}$

Hence, more fraction of the diatomic gas will be as follows.

mole fraction = $\frac{\text{moles of given substance}}{\text{total no. of moles}}$

= $(3)/(14)$

= 0.21

Now, formula to calculate partial pressure will be as follows.

Partial pressure of one species = molar fraction of that species x total pressure

Therefore, $P_(diatomic) = \text{mole fraction diatomic} * P_(total)$

$P_(total) = (0.330 atm)/(0.21)$

= 1.57 atm

Thus, we can conclude that total pressure is 1.57 atm.

How would you prepare 3.5 L of a 0.9M solution of KCl?

Answers

Calculate the mass of the solute in the solution :

Molar mass KCl = 74.55 g/mol

m = Molarity * molar mass * volume

m = 0.9 * 74.55 * 3.5

m = 234.8325 g

To prepare 0.9 M KCl solution, weigh 234.8325 g of salt in an analytical balance, dissolve in a beaker, shortly after transfer with the help of a funnel of transfer to a volumetric flask of 100 cm³ and complete with water up to the mark, then cover the balloon and finally shake the solution to mix

hope this helps!

Tap water ph 7.2 acidic

Answers

A pH of 7.2 would mean it is basic. 0-6 Acidic. 7 - Neutral. 8-14 - Basic.

The action force always acts in the ____ direction as the reaction force

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Answer:

opposite

Explanation:

Newtons law explains that for every action force there is an equal and opposite reaction.

The model below represents a nuclear reaction. Atom 1 is present before the reaction and Atom 2 and Atom 3 are produced after the reaction.Atom 1 = Atom 2 + Atom 3 + energy

The model most likely represents a reaction which
Select one:
a. takes place when atoms combine
b. takes place when atoms become inactive
c. does not produce energy in the sun
d. does not produce energy in nuclear power plants

Answers

Answer: b: takes place when atoms become inactive

Explanation: the model described above is a nuclear fission reaction, a reasonably controlled reaction that releases energy and is employed in nuclear power plants. In these reactions one Atom is split into two lighter ones and there's a resultant release of energy in the process. The original Atom becomes depleted (inactive) as is the case with Uranium 235.

This reaction is opposed to fusion reactions that occur in nature e.g. the sun, and are basically uncontrollable — involving the combination of two atoms into one.

The right answer for the question that is being asked and shown above is that: "d. does not produce energy in nuclear power plants." The model most likely represents a reaction which d. does not produce energy in nuclear power plants

The gray balls represent _____ and have a neutral charge. protons neutrons electrons

Answers

Protons have a positive charge.Electrons have a negative charge.Neutrons have no (neutral) charge.

Answer: The correct answer is neutrons.

Explanation:

There are 3 subatomic particles that are present in an atom. They are: protons, electrons and neutrons.

Protons carry positive charge and are found inside the nucleus of an atom.

Electrons carry negative charge and are found around the nucleus in the orbits.

Neutrons does not carry any charge and are found inside the nucleus of an atom.

Hence, the correct answer is neutrons.

Other Questions

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Which instrument is directly used to determine the relative masses of atoms? (A) spectroscope (B)Geiger counter (C)mass spectrograph (D)microbalance (E)electron microscope

When are atoms considered stable?when they have satisfied the law of conservation of mass naturally or through bonding to obtainfull valence shellswhen they have satisfied the octet rule naturally or through bonding to obtain full valence shellswhen their valence electrons have "fallen" back to ground state through bonding