Answer:
B?
Explanation:
Plzz write a small pharghraph
Question:
A 250mL Erlenmeyer flask weighing 55g contains 5g of sodium bicarbonate. To this, an excess, 15g, of acetic acid is added to the flask. While swirling, many bubbles are present. Finally, you stop swirling the flask, and the bubbles stop. You then place this flask on an analytical balance. The mass registers 73g.
How does this final mass compare with the value expected according to the Law of Conservation of mass?
Why do you believe that this comparison exists?
State the Law of Conservation of Mass. Do these results break this law? Why?
What changes, if any, could be made to the procedures in this experiment to allow a closer comparison to what the Law of Conservation would expect?
What element does this model represent?
Answer:
[tex]$\tex$ Option 2: Aluminum (Al)[/tex]
Explanation:
When we are given Bohr models, we will be given a circle with rings surrounding it. The circle in the center of the model represents the nucleus, which contains the neutrons and the protons. The rings will have spherical structures that are attached to them in an orderly fashion - these model the electrons of an atom.
Protons are positively-charged subatomic particles that also identify the atom's chemical identity and atomic number. Using the number of protons, we are able to identify the element. The neutrons are the neutrally-charged subatomic particles that give an atom its weight. When you look at a traditional periodic table, you'll see that the square that houses an element has its symbol, atomic number, and atomic mass. The atomic mass is equivalent to the sum of the protons and neutrons.Electrons are negatively-charged subatomic particles that give an atom its overall charge. In order for an atom to be stable and neutral, the electrons must equal the protons. Otherwise, we have an unstable atom called an ion with either a positive or a negative charge. This is dependent on whether an atom has gained or lost electrons.When we reference the model, we will see that there are 13 "p" and 14 "n" within the green circle. The "n" refers to neutrons and the "p" refers to protons. We can also count the red spheres and make quick observations about these: there are 2 red spheres on the innermost ring - for simplicity reasons, we will title this ring as r = 1. There are 8 red spheres on the middle ring - this ring will be titled r = 2. Finally, we can see that there are 2 more electrons in the outermost ring - this ring will be titled r = 3.
Now, because we have 13 protons, we know that the protons are equivalent to the atomic number.
If we check the periodic table, we will see that Silicon (Si) has an atomic number of 14. This doesn't match the number of protons, so we can rule out that a silicon atom is not the element shown.When we use the same process and check aluminum, we discover that Aluminum (Al) has an atomic number of 13. Since the number of protons and the atomic number are equal, we can conclude that this is the element.If we check Helium (He), we see that it has an atomic number of 2, so this is definitely not our element in question.Now that we have concluded that Aluminum is our element, we can check this to be sure. If we use the formula m = n + p (where m is the atomic mass, n is the neutrons, and p is the protons), we can check to be sure we have selected the right element.
The given mass of aluminum on the periodic table is 26.982 atomic mass units. We round to the nearest integer when it comes to this, so we round 26.982 up to 27 even.
Now that we have determined the atomic mass and we are given the number of both protons and neutrons, we can act as if we weren't given the amount of neutrons and only the mass and amount of protons. We can then use the equation to solve for the amount of neutrons and check that the selection we made is correct.
Steps
Substitute 27 for m and 13 for p.Subtract 13 from both sides to isolate the n and place the constants on the same side of the equation.Combine like terms by taking the appropriate operations (in this case, this is subtracting 13 from 27).Finally, because we are solving for n, you can reverse the equation (place the constant on the right and place the variable on the left; i.e., 72 = x → x = 72).[tex]27 = n + 13\\\\27 - 13 = n\\\\14 = n\\\\n = 14[/tex]
The work we just performed will allow us to confirm that because we solved for 14 neutrons, Aluminum (Al) is indeed the element represented by the model.
Hope this helps! :)
Please Help I need it!!
(An electric motor uses regular magnets and an electromagnet to create motion. The attracting and repelling forces create rotational motion along with the electric current from the electromagnet.)
What two things can a car manufacturer do to make an electric motor stronger?
A) A car manufacturer can add coils to the electromagnet and increase the size of the magnets causing the rotational motion.
B) The car manufacturer can add coils the the electromagnet and decrease the size of the magnets causing the rotational motion.
C) The car manufacturer can remove coils from the electromagnet and increase the size of the magnets causing the rotational motion.
D) The car manufacturer can remove coils from the electromagnet and decrease the size of the magnets causing the rotational motion.
Answer:
The answers A i did the test
A car manufacturer can add coils to the electromagnet and increase the size of the magnets causing the rotational motion and the correct option is option A.
What are electromagnets?Electromagnets are made out of a coil of wire (wire curled in series).
This is more effective in producing a magnetic field than just a wire running straight.
This effect can be strengthened by winding a wire tightly around a powerful core made of magnetic material, such as iron.
The strength of the magnetic field is proportional to the number of turns made around the iron core and how tightly they are wrapped around.
Therefore, a car manufacturer can add coils to the electromagnet and increase the size of the magnets causing the rotational motion and the correct option is option A.
Learn more about Electromagnets, here:
https://brainly.com/question/3427992
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Idk this question and I need help
Answer:
12 ML
Explanation:
BECAUSE THE WATER ROSE 12 ML SO THE KEY IS 12 ML
What is an ellipse please help)
In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. As such, it generalizes a circle, which is the special type of ellipse in which the two focal points are the same.
Maybe they might use that math thing for Science.
Why is melting a physical property of the wax from a burning candle, but flammability is a chemical property?
Explanation:
, , ' . .
Answer:The physical change is quite often and can be seen clearly. When the wax melts slowly and the candle gets smaller and smaller. This is the physical change of the burning candle. This wax that melts slowly comes together back into solid and the sticks to the candle. This is also a physical change.
Explanation:
plz help as soon as possible
Answer:
A. It forms on the earth's surface
Answer: Extrusive igneous rocks are formed when magma is cooled above the ground it forms on the earth's surface.
Explanation: Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass. These rocks include andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff.
A characteristic of this environment is very little precipitation, sometimes in the form of snow. Which environment is this describing?
Desert
NOT Grassland
Mountain
Tundra
Answer:
the answer is desert, hope this helped
Explanation:
Which climate zone is hot and receives a lot of precipitation throughout the year?(2 points)
Equator
Polar
Temperate
Tropical
Answer:
Equator
Explanation:
Answer: tropical
Explanation:
Non-traditional data is often displated on food labels using a bar graph or a circle graph?
True
False
Please helpp
25 points ;)
Answer:
The correct answer is "True" hope this helps - Answer Expert Verified
Explanation:
Earthquakes, volcanic activity, and mudslides most commonly affect which region in the United States?
A.
the Northeast
B.
the Interior
C.
the South
D.
the West
What is the is arrow pointing to? A.period symbol of manganese. B isotope symbol of manganese. C.group symbol of manganese. D atomic symbol of manganese.
Answer: The answer is D. the arrow is pointing at the atomic symbol of manganese
Explanation:
Atomic symbols are the letters that represent elements like how the atomic symbol "O" represents the element oxygen
Gold is one of the Densest substance known, with the density of 19.3 g/cm3 . if the gold in the crown was mixed with a less-Valuable metal like Bronze or copper, how would that effect it's Density?
A family decides to use their bicycles to get to the mall on weekends instead of driving a car. How is the family helping the environment?
The family is using less renewable resources.
The family is using less non-renewable resources.
The family is causing less fertilizer to enter the water.
The family is causing less trees to be cut down.
Answer:
they are using less non renewable resources
Explanation:
Answer:
the second option:
The family is using less non-renewable resources.
Explanation:
If a car was used, the gas in the car would cause damage and or make the air dirtier than it already is (from the fums).
Plus when using a car, you waste more gas as well as money.
NEED HELP ASAP!!!!
Which graph shows a negative acceleration? A - B - C - D
Answer:
C or D, as A and B are going upward and you need NEGATIVE acceleration so it has to be going down, though I believe it is C, but you'll have to confirm it.
Explanation:
In the given situation, Graph B shows negative acceleration because the velocity is decreasing. The option C is correct.
What is acceleration?The term acceleration is defined as the rate of change of an object's velocity with respect to time.
The change in rate of displacement is called as velocity. The rate of change of velocity is defined as acceleration.
It includes both magnitude and direction, velocity is a vector quantity. Because it is simply the rate of change of velocity, acceleration is also called a vector quantity.
The slope of the line on the velocity-time graph reveals the object's acceleration. An upward slope represents positive acceleration, which means the object is moving faster.
A downward slope represents negative acceleration, which indicates that the object is slowing down.
Thus, the option C is correct.
To learn more about an acceleration, follow the link;
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A basketball is made of matter. fire itself is not matter, however the wood that burns is matter. a basketball is very diffrent from a fire. what are some diffrences that might make a basketball matter but not a fire
Answer: A basketball is a solid and fire is a gas
Explanation:
To prove that a basketball is a solid you can try to move your hand right through it, you cant so its a solid
To prove fire is a gas you can try to move your hand right through it, you can move your hand right through it so its a liquid or gas in this case it is a gas
Is this statement true or false?
If one or more substances change into new substances, a chemical change occurred.
true
false
Answer:
True
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ow doe the respiratory system work? (Use 3-5 sentences to explain how the respiratory system works.)
Answer:
The respiratory system is a system in your body that is in charge of helping you breathe. the respiratory system is made up of airways, lungs, and blood vessels, these parts work together to get oxygen into your body. Our respiratory system is a vital system, as it lets us live and breathe.
Explanation:
Here you go, don't copy exactly
I need help with These two please
I believe the first beaker is 17ml and the second one is 29ml, I hope this helps! Also remember to drink water today.
the Monstera Plant, in the rainforest have long, grooved leaves to drop water to the forest
floor. The excessive water that falls in the rainforest could lead to mold, so the leaves adapted to
have “drip tips” that allow the water to run off of the leaves.
What type of adaptations are these?
Monstera Plants of the rainforest. Your answer should be 3–4 sentences long.
Answer:
Theses are physical adaptations. The trees have adapted to protect themselves against mold. The “drip tips” are a new physical part of the trees, so they are physical adaptations.
Match the element with its description.
Answer Choices:
1. Highly reactive gas
2. Malleable, soft, and shiny
3. Nonreactive gas
4. Has properties of both metals and nonmetals
Which of the following elements is inert, meaning it is not reactive?
a)Cesium
b)Gold
c)Iodine
d)Xenon
Which drawing represents the electric field surrounding two objects that have equal magnitude charges of opposite polarity?
A) A
B) B
C) C
D) D
Answer: B
Explanation:
An object with a positive charge will have its arrows pointing outwards, while a negative object will have its arrow pointing inwards.
what is the date that amarica started nuclier sciences
Answer:
can you help
Explanation:
Answer:
hear u go
Explanation:
The first self-sustaining nuclear chain reaction occurs at the University of Chicago. 1945 July 16. The U.S. Army's Manhattan Engineer District
(GIVING BRAINLYIST) Environment A is warm and gets lots of rain. Environment B is warmer and gets more rain year round. Identify Environment A.
Desert
NOT B) Rainforest
Swamp
Tundra
11) Maricela and Joaquim are standing on the floor very close to each other. They are not touching. Which of the following statements is true about the forces that are present?
A) The is a large gravitational repulsion between the two students.
B) There is a large gravitational attraction between the two students.
C) There is a small gravitational repulsion between the two students.
D) There is a small gravitational attraction between the two students.
Answer:
D
Explanation:
Anything with mass has gravitational attraction. Maricela and Joaquim have mass, which means they have gravitational attraction towards one another. Why are they not touching/getting close to one another? It is because both of them have a tiny amount of gravitational pull. In order for this to be considered a large amount of gravity (or B) , they would both would have to have a significant amount of mass, such as the moon or sun. The reason the answer is not A or C is because "gravitational repulsion" doesn't exist.
Scientific predictions based on laws are formulated using:
deductive reasoning
inductive reasoning
presuppositions
subjective reasoning
Answer:
A. deductive reasoning
At the top of a high mountain, the weight of an object is:
A. greater than at sea level
B. less than at sea level
C. the same as that at sea level
Answer:
b is answer. im sorry
What is the environmental change shown in the image?
dry and cracked soil with little vegetation
Disease
Lack of food and water
Reduced space
Pollution
Answer:
B. Lack of food and water is the answer. I don't see a picture
Answer:
a lack of food is your answer
What is A ATOM?
First one to answer will get BRAINLIEST!
Answer:
an atom makes up everything and anything. it is microscopic and the basic building block of any chemical or matter
Answer:
a atom makes up everything