CHEMISTRY HIGH SCHOOL

Rita divides Avogadro’s number (approximately 6.022 mc002-1.jpg 1023) by 2.0550 to calculate the number of atoms in a sample. Which expression gives her result to the correct number of significant figures?

Answers

Answer 1
Answer: Here you have two numbers. Avogadro's number is given with four significant figures, while number 2.0550 is given with five significant figures. That means that your result must be shown with four significant figures. So, 6.022 * 10 ^ 23 / 2.0550 = 2.930 * 10 ^ 23, which has been rounded to four significant figures. Answer: 2.930 * 10 ^ 23
Answer 2
Answer:

Answer:

Answer is B

Explanation: Trust

Related Questions

A 10.35g piece of copper metal was heated to 85.5 degrees C and then placed into 23.6g of water. the initial temperate of the water was 18.3 degrees C. what was the final temperature?
Why is gold preferred as a superior metal over silver and bronze?
A solution has the 23.22% mass/volume of a particular solvent what is the mass of solute dissolved in 2.5 liter of solvent?
The Hadley , Ferrel , And polar cells are all patterns of
Which of the following is an oxidation-reduction reaction?Fe2O3 + 3CO mc009-1.jpg 2Fe + 3CO2 CuSO4 + 2NaOH mc009-2.jpg Cu(OH)2 + Na2SO4 2NaOH + H2CO3 mc009-3.jpg Na2CO3 + 2NaOH Pb(NO3)2 + Na2SO4 mc009-4.jpg 2NaNO3 + PbSO4

Stars are formed from interstellar clouds because ofthe Law of Entropy
the Law of Universal Gravitation
the Law of Stellar Evolution
the Law of Propulsion

Answers

The answer is D. Stars are formed from interstellar clouds because of the Law of Universal Gravitation. The interstellar clouds are termed as nebula. When other stars dies a supernova occurs then the gravity from this pushes matter into the clouds until it cannot overcome the gravitational pull and it collapses which heats matter up forming a star.

In which type of chemical reaction are electrons transferred?1) organic addition
2) oxidation-reduction
3) double replacement
4) acid-base neutralization

Answers

The correct answer is 2. 

In oxidation-reduction reactions (or redox reactions), a number of electrons are transferred between two species. During this process, the oxidation number of an atom (or molecule or ion) changes by receiving or losing an electron.

Answer: It is number 2

The combustion of fossil fuels releases ____ into the atmosphere. oxygen

gasoline

carbon

glucose

Answers

Answer: The correct answer is carbon.

Explanation:

Combustion reaction is defined as the reaction in which a hydrocarbon burns in oxygen or reacts with oxygen gas to produce carbon dioxide and water molecule.

Fossil fuels are defined as the hydrocarbons which mainly contains coal, fuel oil, natural gas etc..

When fossil fuels are burned in air, it mainly releases carbon dioxide, sulfur dioxide, methane, nitrous oxide etc..

The major component released during the combustion of fossil fuels is carbon.

Hence, the correct answer is carbon.
CARBON because fossil fuells 

1. For each of the following numbers, by how many places must the decimal point bemoved to express the number in scientific notation?
II. For each number, will the exponent be positive, negative, or zero?
0.0000089911

Answers

The number that you have shown the exponent would be negative and I believe it would be 6 places so 8.9911 x 10^-6

Evidence seems to show that life originated from chemicals? True or False

Answers

Answer:

True.

Explanation:

True. Based on scientific evidence and theories such as the Miller-Urey experiment, which successfully demonstrated the formation of organic compounds under conditions simulating early Earth, it is widely accepted that life originated from chemicals. The process of chemical evolution, combined with favorable environmental conditions, eventually led to the development of self-replicating molecules and the emergence of primitive life forms.

Define the law of conservation of charge and provide an example.Define opposite charges attract and like charges repel and provide an example.

Define Electricity along with an example.

Answers

Answer:

Conservation of Charge is the principle that the total electric charge in an isolated system never changes. The net quantity of electric charge, the amount of positive charge minus the amount of negative charge in the universe, is always conserved.
Other Questions
Which property is true for metals
How many atoms are there in one molecule of hexane? (a) six (b) ten (c) twelve (d) twenty
A laboratory requires 2.0 L of a 1.5 M solution of hydrochloric acid (HCl), but the only available HCl is a 12.0 M stock solution. How could you prepare the solution needed for the lab experiment? show all work to find your answer
HCl solution, about 250 mL in volume. The pH of the solution is 1.37. Calculate the molar concentration of HCl in this solution. Please use the scientific presentation of the numerical answers (i.e., 1.23x 102), and round your answers to two decimal places.