Which is true about what models allow us to do to the system being studied? Question 8 options: Increase the amount of waste produced. Decrease what we learn about a system. Decrease the amount a system is studied. Increase the size of a very small system, allowing easier understanding of what is occurring.
Answer:
Increase the size of a very small system, allowing easier understanding of what is occurring.
Explanation:
Models allow us to increase the size of a very small system, allowing easier understanding of what is occurring .
This can be explained with the help of an atom model. An atom model helps students understand what is happening inside the atom by making the atom large enough to be seen with the naked eye. Once the thing can be seen with the eyes it is easier for the brain to interpret chemical reactions or chemical charges inside the atoms.
How many moles are in 2.5 * 10^20 iron atoms?
Answer:
The answer is 0.0004 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{2.5 \times {10}^{20} }{6.02 \times {10}^{23} } \\ = 0.000415282...[/tex]
We have the final answer as
0.0004 molesHope this helps you
What is the difference between burning and an explosion?
a. Burning is a combustion reaction but an explosion is an accident.
b. The rate (speed) at which the reaction happens.
C. An explosion is a combustion reaction, but burning is just a chemical
reaction
Please help! ______ is not reactive with only 2 electrons in its valence shell.
Neon
Krypton
Xenon
Helium
Answer:
Helium
Explanation:
idrk because it has a more carbinic bond
find the temperature change of water when the mass is 45.0g and the intial temperature is 20.0C
Answer: The answer is 41.5 C
(45.0 g)(x - 20 C) = (22.3 g)(85 C - x )
45.0x + 900 C = 1895.5 C - 22.3x
+22.3 x - 900 C = -900 C + 22.3 x
67.3x = 2795.5
2795.5 / 67.3 = 41.54 C
Explanation:
Role play anyone????
Answer:
no thanks
Explanation:
Answer:
I'd be down.
Explanation:
whay are shakespeare's plays considered difficult for modern students to understand
What is the reaction ship between cells and tissues
Answer:
A. Tissues are made up of cells
Explanation:
I just googled it :3
C connected to 2 H's by 1 line each and to O with 2 lines. The O has 1 pair of dots above and 1 pair of dots below.
How many electrons do carbon and oxygen share?
Answer:
4
Explanation:
I just got it right on one of the assignments in Edge2020.
Answer:
The answer is 4
Explanation:
Excluding the noble gas group, how does the number of valence electrons in an element influence its chemical reactivity? O A. Elements with the lowest and highest numbers of valence electrons are the most reactive, B. As the number of valence electrons increases, the chemical stability of the elements decreases. C. Elements with the lowest and highest numbers of valence electrons are the least reactive. O D. As the number of valence electrons increases, the chemical stability of the elements also increases.
The relation can be described as:
A. Elements with the lowest and highest numbers of valence electrons are the most reactive.
Elements with lowest or highest valence electrons:Valence electrons can be described as the electrons in the outermost shell. The elements having the least valence electrons such as Helium which has stable electronic configuration or Chlorine which has the highest valence electrons that are 7. These can react easily with the elements having electrons according to reactivity.
Example: Chlroine reacts more easily with elements of group 1.
Thus, option A is correct.
Find more information about valence electrons here:
brainly.com/question/371590
Suppose you have a mixture of sand, marbles, sawdust, and blocks of wood. You can separate these four things with a window screen, a bucket, and water. This will take three steps. The screen is used in the first step. The bucket and water is used in the second and third steps. Describe the three steps. Tell which properties of the materials made it possible to separate the mixture.
Answer:
Solubility and Particle size
Explanation:
The screen should be able to separate the blocks of wood and marbles from the sand and saw dust, assuming the marble are larger than the screen openings. This is possible through difference in particle sizes.The bucket can allow for removal of the marbles from the sand and sawdust if its smaller than the screen. Marbles are general larger than sand and would settle at the top.The water in the bucket would dissolve the saw dust instantly, leaving the sand. Sand is not soluble in water unlike he finer sawdust particles.I hope this was clear.
i need help !! if anyone could help that would be good!!
Region A ⇒ group 2
Further explanationValence electrons are electrons used in a chemical bond , and in an atom's outermost energy level
The periodic system of elements is an arrangement of elements classified based on similar properties and their atomic number order.
The periodic system is divided into groups (vertical order) and periods (horizontal order)
In the periodic system
The group number in the periodic system is determined by the same valence electrons (main group), while the period is determined by the number of shells
The 2 valence electrons are in group 2
A : group 2 : Valence electrons =2
B: group 13 : Valence electrons = 3
C : group 15 : Valence electrons = 5
D : group 16 : Valence electrons = 6
When radioactive uranium decays to produce thorium, it also emits a particle. As seen in the balanced nuclear equation, this particle can BEST be described as
Answer:
an alpha particle or helium nucleus
Explanation:
Uranium spontaneously undergoes alpha decay. During an alpha decay, the uranium nucleus spontaneously decays to produce a thorium nucleus, alpha particles and energy.
The balanced nuclear equation is shown in the image attached to this answer for clarity.
The decay of uranium to thorium has been best described as the alpha decay.
The nuclear decay has been given as the decomposition of the atom by emitting radiations. The emission has been responsible for the change in the nucleus of the atom to the daughter nuclei with smaller mass.
The decay of Uranium to thorium has been the spontaneous alpha decay. There has been the loss in the mass of uranium in the form of energy, resulting on the thorium nucleus.
Thus, the decay of uranium to thorium has been best described as the alpha decay.
For more information about the nuclear decay, refer to the link:
https://brainly.com/question/14077220
Juan's mother drives 7.25 miles southwest to her favorite shopping mall. A. Average velocity is the total displacement divided by the total time taken. What is the average velocity of Juan's mother's automobile if it arrives at the mall in 20.0 minutes? B. Does the average velocity reflect the how fast Juan's mother was driving at every point in her journey? Explain your answer by comparing the terms average velocity and instantaneous velocity.
Answer:
See explanation
Explanation:
Average velocity = distance traveled/time
distance traveled = 7.25 miles
Time taken = 20 minutes or 0.33 hours
Average velocity = 7.25 miles/0.33 hours = 21.97 miles per hour
This average velocity does not reflect how fast Juan's mother drove at every point in the journey.
At every point in the journey, Juan's mother had an instantaneous velocity given by the velocity at that given instant divided by time taken up to that point.
The instantaneous velocity gives the velocity at particular instants throughout the journey while the average velocity reflects the average velocity of the entire journey.
Magnesium has three isotopes: Magnesium-24, Magnesium-25 and Magnesium-26. The numbers 24, 25 and 26 refer to the ________________.
Answer:
I'm pretty sure the answer is Atomic Mass.
Hope I could help!
Please answer it’s due today. I will give brainliest
Answer: It depends
Explanation: If you’re using an electric kettle then yes, it’s true!
Use the diagram to answer each question.
Rock Stress
с
D
Compare diagram B to diagram A. How is it different?
Answer:
c is more compressed than d
Explanation:
Please answer these questions.. please
Assuming that water is made of tiny little water molecules, would you say that water molecules are attracted to one another, repelled by one another, or are kind of neutral about each other?
-attracted to one another
-repelled by one another
0kind of neutral about each other
Answer:
attracted to one another
Explanation:
water is cohesive
Calculate the quantity of heat in joules required to completely vaporize 100 grams of H2O() at 100.°C and 1.0 atm.
Answer:
required to completely vaporize 102.3 grams of H2O(l) at 100°C and 1.0 atm. 1.
Explanation:
The substances at the beginning of a reaction are called _______ while the substances at the end of a reaction are called _____.
products, reactants
reactants, products
Answer:
reactants, products
Explanation:
What does a high specific heat tell about a substance?
A. It is hard to change the temperature of the substance.
B. The substance is probably a metal.
C. The substance has very strong molecular bonds.
D. The substance has high melting and boiling points.
Answer:
A. It is hard to change the temperature of the substance
Explanation:
took test
Please help me answer this.
What gas do animals give off in the dark?
Explanation:
Animals give off carbon dioxide and plants make oxygen by carbon dioxide.
Earths system analysis graphic organizer
Answer:
attached
Explanation:
Which of these statements is supported by evidence in both articles? A The Triangle Fire was a tragedy that could have been prevented. B The absence of fire drills caused confusion among the trapped workers. C The Triangle Fire had a lasting impact on safety regulations. D Onlookers who witnessed the fire were horrified by what they saw.
Answer: A The Triangle Fire was a tragedy that could have been prevented.
Explanation:
The Triangle Fire was a tragedy that happened in the factory of Shirtwaist Company in New York City where there was.a.fore outbreak and about 145 employees of the company were killed.
The deaths could have been prevented because the company neglected safety measures such as having a good and reliable pump system, having readily available fire extinguishers. Also, what resulted in the lethal nature of the incident was because the doors within the building of the factory were locked.
The tragedy generated lots of attention and series of laws were been out in place in order to ensure that workers are safe at their workplace.
would coal be considered a mineral (yes or no) Why or why not
Answer:
It's classified as an organic sedimentary rock
Explanation:
What's the deal with coal? It's classified as an organic sedimentary rock, but rocks are combinations of minerals, and minerals are inorganic. ... So yes, coal is classified as an organic sedimentary rock, and yes, rocks are supposed to be made of minerals and minerals can't be organic.
Choose the word that best completes the sentence.
Column A
1.
The positive subatomic particle is called the:
The positive subatomic particle is called the
2.
The negative subatomic particle is called the:
The negative subatomic particle is called the
3.
The neutral subatomic particle is called the:
The neutral subatomic particle is called the
Column B
a.neutron
b.electron
c.protist
d.proton
e.eukaryote
Answer:
1. proton
protist
2. electron
eukaryote
3. neutron
Which of the following equations follows the Law of Conservation of Mass? 65
(5 Points)
3H2O --> 3H2 + 3 02
C2H4 + 3 02 --> 2 CO2 + 2 H2O
C + 4H2 --> CH4
2Na + Cl --> NaCl
ILL MARK YOU AS TOP COMMENT
Answer:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
Explanation:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
3H₂O → 3H₂ + 3O₂
This equation do not follow the law of conservation of mass because there are more oxygen atoms on right side so mass is not conserved.
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
This equation follow the law of conservation of mass because there are equal number of atoms of all elements on both side of equation.
C + 4H₂ → CH₄
This equation do not follow the law of conservation of mass because there are more hydrogen atoms on left side of equation so mass is not conserved.
2Na + Cl → NaCl
This equation also do not follow the law of conservation of mass because there are more sodium atoms on left side of equation so mass is not conserved.
Which of these statements accurately describes monomers?
Monomers are macromolecules.
Monomers contain double bonds.
Monomers are made of repeating units.
Monomers contain bonds between metals.
Answer:
monomers contain double bonds
Explanation:
Answer:
B.Monomers contain double bonds.
Explanation:
