CHEMISTRY MIDDLE SCHOOL

How many moles are in 15 grams of carbon dioxide?

Answers

Answer 1
Answer:

Answer:

There are 0.34 moles of CO2 in 15 grams of CO2

Explanation:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 mole CO2.

Molar mass of CO2 = Molar mass of Carbon + Molar mass of Oxygen multiplied by 2

Molar mass of carbon = 12 g/mol

Molar mass of oxygen= 16g/mol

Molar mass of CO2= 12g/mol + (16g/mol)2

= 12g/mol +32g/mol= 44g/mol

In other words, we can say that 1 mole of CO2 has a mass of 44gram

Number of moles of CO2 = mass of CO2 / molar mass of CO2

Mass of CO2= 15g/mol

Number of moles of CO2= 15gmol-1 / 44gmol-1

= 0.3409 moles

Hence, there are 0.34moles of CO2 present in 15 grams of CO2.
Answer 2
Answer:

Answer: 0.34 moles

Explanation:

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NEED URGENT HELP WITH SCIENCE HOMEWORK. TRIED MY BEST TO FIGURE OUT BUT COULDNT. I WILL MARK YOU BRAINLIEST!!Morains aredepositional material covered up when a glacier formsdeposition material exposed after a glacier retreatsdepositional material on top of a glacierWhich of the following is a feature of old glacial areas?Limestone pavementDesertsFjordsWhich of the following is required for karst topography?limestone rock is exposed to the surfaceprecipitation is adequate for the necessary chemical reactions to occurboth of the aboveWhich of the following causes most coastal erosion?WindWavesBiological activityWhich of the following statements is false about constructive waves on coastal shorelines?Constructive waves carry sand to the shorelineCompared waves deposit sand on the shorelineConstructive waves are the major contributor to beach erosionThe fetch is the water that washes up on a shore after the breaking of a wave.TrueFalseWave refraction, the bending of waves as they approach an island, is the process responsible for the formation of bays.TrueFalseThe subtropical zones are ________ because they are influenced by dry descending air.dry desertswarm tropicscold tundraIn humid climates, dense vegetation discourages wind erosion.TrueFalse
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Andrea is going to the golf course.The golf course charges a flat rate of $5.00 plus $1.50 per bucket of 50 golf balls. When she arrives,she is offered a discount rate of $.50 for a bucket of 50 golf balls plus the same flat rate. Andrea has $8.25 to speed. How many more bucket of golf balls will Andrea be able to get with the discount?A. 2 buckets B. 4 buckets C. 6 buckets D. 8 buckets
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A 10-Newton object displaces 12 Newtons of water. Will this object sink of float?I'm confused, my guess is sink.

Answers

Answer: The object will float.

Explanation:

Balanced force is defined as the force that gets cancelled out when equal forces are acting in the opposite direction. The net force on the system comes out to be 0.

Unbalanced force is defined as the force that does not get cancelled out because unequal forces act on the system in opposite direction. The motion of the object is in the direction of net force.

According to the question:

Object is exerting a downward force of 10 N on the water and water is exerting an upward force of 12 N on water.

As, the upward force by water is more than the downward force by object. So, the object will float on the surface of water.

If the downward force by the object is been more than the upward force, the object will sink.

Hence, the object will float.
This object would float

If someone tells me that scientific knowledge cannot be changed or modified how would I answer that statement

Answers

You would say Scientific knowledge is always being changed and performed in different ways. Scientific knowledge is always being changed as scientist are experiencing and collecting new information everyday using the scientific method.

Final answer:

Scientific knowledge can be changed or modified as scientists use systematic approaches and rigorous methodologies to gather evidence and formulate theories. The scientific method encourages scientists to question existing knowledge, challenge hypotheses, and propose new ideas. Peer review and continuous evaluation help refine scientific knowledge.

Explanation:

Scientific knowledge can indeed be changed or modified. The nature of scientific research is based on the idea of continuous learning and refining our understanding of the world. Scientists use systematic approaches and rigorous methodologies to gather evidence and formulate theories, but these theories are always subject to revision and refinement as new evidence emerges. This is a key aspect of the scientific method, which encourages scientists to question existing knowledge, challenge hypotheses, and propose new ideas.

For example, the theory of evolution has undergone several modifications and updates since it was first proposed by Charles Darwin. As new fossil evidence, genetic studies, and experimental observations have emerged, our understanding of evolutionary processes has evolved and become more nuanced.

In addition, the scientific community engages in peer review, where scientists evaluate and critique each other's work. This process ensures that scientific knowledge is continuously evaluated and refined, and any flaws or limitations in research are identified and addressed.

Learn more about Changing and modifying scientific knowledge here:

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Marfan syndrome is a genetic disorder caused by a dominant allele.describe how marfan syndrome is inherited

Answers

Marfan syndrome is a genetic disorder caused by a dominant allele. It is inherited in an autosamal dominant pattern which means that one copy of the mutated gene from at least one parent is enough to give the disorder to that person. If it is recessive, both parents must have it for their offspring to get it. 

Which statement describes a reversible reaction at equilibrium?(1) The activation energy of the forward reaction must equal the activation energy of the reverse reaction.
(2) The rate of the forward reaction must equal the rate of the reverse reaction.
(3) The concentration of the reactants must equal the concentration of the products.
(4) The potential energy of the reactants must equal the potential energy of the products.

Answers

Answer: The correct answer is Option 2.

Explanation:

Reversible reaction is defined as the reaction in which the products formed react together to give the reactants back. For general reversible chemical equation:

aA+bB\rightleftharpoons cC+dD

At equilibrium, the rate of forward reaction is equal to the rate of backward reaction.

Rate of forward reaction:k[A]^a[B]^b

Rate of backward reaction:k[C]^c[D]^d

At equilibrium, k[A]^a[B]^b = k[C]^c[D]^d

Thus, the correct answer is Option 2.
When a reaction has reached Equilibrium, the rate of the forward reaction is equal to that of the backward reaction.

Tissues combine to form …A cells
B organs
C organ systems
D organisms

Answers

Answer:

B Organs

Explanation:

Cells come together to form tissue Tissue comes together to for Organs Organs come together to form Organ Systems Organs Systems come together to form Organisms

24 POINTS!!!!!!!!!!!!!!!!!!Sarah, who has a mass of 55 kg, is riding in a car at 20 m/s. She sees a cat crossing the street and slams on the brakes! Her seatbelt stops her from flying forward, bringing her to rest in 0.5 seconds. How much force did the seatbelt put on Sarah?

Answers

F = (mass)(acceleration) = ma

m = 55 kg

Vi = 20 m/s

t = 0.5 s

Vf = 0 m/s (since she was put to rest)

a=(Vf-Vi)/t

a=(0-20)/5

a = 40 m/s^2 (decelerating)

F = ma = (55 kg)(40 m/s^2)

F = 2200 N

Hope this answer will be a good help for you.
 change of momentum =mv-mu=m(v-u)=55(0-20)=-1100
rate of change of momentum=-1100/0.5=-2200  this is equal to force applied.
so force=-2200 kg/m^2
negative sign shows force acts in opposite direction to motion.
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