Answer:
a. 53.3°C.
b. Percent error for both students is 53.3°C
c. Both students are equal in accuracy.
2nd student is most precise
Explanation:
The percent error is defined as:
|M - T| / T * 100
Where M is measurement,
and T is theoretical value
a. To obtain the average of both measurements we need to sum the measurements and divide these in the number of measurements:
51.5°C+53.5°C+55.0°C+52.3°C+54.2°C+52.3°C+53.2°C+54.0°C+53.5°C / 9
= 53.3°C
b. Percent error for 1st student:
51.5°C+53.5°C+55.0°C+52.3°C+54.2°C / 5 = 53.3°C
|53.3°C - 53.0°C| / 53°C * 100
0.57%
Percent error for 2nd student:
52.3°C+53.2°C+54.0°C+53.5°C / 4 = 53.3°C
|53.3°C - 53.0°C| / 53°C * 100
0.57%
c. Now, precision is how close are the measurements to each other and the accuracy how close are the measurements to the theoretical value:
The accuracy is obtained with percent error, the lower percent error the most accurate measurement. That means:
both students are equal in accuracy.
And precision is obtained with relative standard desviation.
Desviation standard / Average * 100
(We can solve the standard desviation in a scientific calculator):
1st student:
2.65%
2nd student:
1.34%
The lower RSD the most precise measurements.
2nd student is most preciseWhat is a convection current (Be sure to include how temperature and density are involved.
Convection currents are flowing fluid that is moving because there is a temperature or density difference within the material. ... A temperature difference leads to an energy transfer from an area of higher energy to one of lower energy. Convection is a heat transfer process.
If the atomic number of an element is 16, what is the element's identity?
What is its atomic mass
Answer: The element is sulfur and the atomic mass is 32.07
Explanation: wasn’t sure what you were asking so gave you both
8.
Blank is the transfer of energy by electromagnetic waves.
Your answer
Help please! I’ll mark brainliest to who ever answers this first!!
Answer:
paleontologists is the answer to scientist who studies fossil
A student analyzed an unknown sample that contained a single anion. The sample gave a white precipitate upon addition of a solution of AgNO3 which dissolved in ammonia. Which anion is present in the unknown solution? Write the corresponding net ionic equation.
Answer:
Chloride ion
Explanation:
The anion present in the unknown solution would be chloride ions.
A white precipitate of silver chloride is usually formed when drops of silver nitrate are added to a solution containing chloride ions. The ionic equation is as below:
[tex]Cl^- (aq) + Ag^+ (aq) --> AgCl (s)[/tex]
Transfer of heat through conduction can occur in which of the following?
A. Solids
B. Liquids
C. Gases
D. All of the above
Jeremiah pushed Anthony with a net force of 12 N. Anthony accelerated across the hall at 0.2 m/s2. What was Anthony’s mass?
Answer:
6
Explanation:
Work Shown:
Force = Mass*Acceleration
F = ma
12 = m*0.2
12/0.2 = m
60 = m
m = 60 kilograms
Why do electrons falling into different orbits give off characteristics wavelengths?
Explanation:
Because the difference in energy between orbits is different in different types of atoms, moving electrons between different orbits requires photons carrying different amounts of energy (different wavelengths).
The Synthesis Reaction of aluminum (Al) and iodine (I) forms a new, more complex
product. What is the product?
Answer:
Aluminum iodide (AlI₃)
Explanation:
The synthesis reaction of aluminum (Al) and iodine (I) can be illustrated as shown below:
Aluminium exhibit trivalent positive ion (Al³⁺)
Iodine exhibit univalent negative ion (I¯)
During reaction, there will be an exchange of ion as shown below:
Al³⁺ + I¯ —> AlI₃
Thus, we can write the balanced equation for the reaction as follow:
Al + I₂ —› AlI₃
There are 2 atoms of I on the left side and 3 atoms on the right side. It can be balance by putting 2 in front of AlI₃ and 3 in front of I₂ as shown below:
Al + 3I₂ —› 2AlI₃
There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Al as shown below:
2Al + 3I₂ —› 2AlI₃
Thus the equation is balanced.
The product on the reaction is aluminum iodide (AlI₃)
Colour in acid of red litmus paper
Red
Litmus paper turn red when it comes in contact with acid. It turn blue if it come in contact with a base. Neutral litmus paper is purple
Need help ASAP!!please
Please help! I’ll mark brainliest for best answer!
Answer:
The Atomic Number
Explanation:
The X would be the Atomic Number or amount of protons sorrounding the nucleus of that atom.
Isotopes of the same element have different numbers of
A protons
B neutrons
C neutrons and electrons
D protons and electrons
please hurry i will MARK BRAINLEST
This image shows a volcanic eruption in Hawaii with lava flowing into the sea.
Which statement best describes this eruption?
Its magma is high in silica.
Its magma has low viscosity.
Its gases are released in rapid bursts.
Its lava came from an explosive eruption.
Answer:
B.) Its magma has low viscosity.
Explanation:
I know this cause I also use edge and I got it correct.
Answer:
B
Explanation:
Hope you get 100%!
This is methane, Methane is gas that is found in small quantities in Earth's atmosphere. Methane is the simplest hydrocarbon,
consisting of one carbon atom and a powerful greenhouse gas. What is the chemical formula for methane?
A)
4CH
B)
C4H
C)
C4H4
D)
CH4
Answer:
CH4
Explanation:
I looked it up and took the test
Answer:
You go to K12?
Explanation:
Using the three words below (cell wall, cell membrane and animal cell) construct your own sentence using what you have learned about plant and animal cells. PLEASE HELP ME IT WILL BE
Answer:
Explanation:
Both eukaryotic and prokaryotic cells have a cell membrane, which defines the limit between the environment surrounding the cell and the cell itself.
Eukaryotic cells can be either animal cells or plant cells. Plant cells, apart from the membrane, are surrounded by a cell wall that is thick and conformed by carbohydrates and peptides. This cell wall makes the cell resistant and gives it its shape. Animal cells, on the other hand, do not have cell walls, they only have the cell membrane, that regulates the entrance of nutrients and the exit of metabolic products.
A massless length of twine can withstand a maximum tension of 490 N. The twine is used to spin a 28-kg ball in horizontal circular motion of radius 1.8 m. The ball is spun faster and faster until the twine breaks. What was the maximum speed of the ball?
7.2 m/s
3.2 m/s
5.6 m/s
11 m/s
Answer:
5.6 m/s
Explanation:
What is one example of pre-exising marine life?
dinosaur egg
shrimp burrow
leaf imprint
bird bone
Answer:
Shrimp burrow
Explanation:
Shrimp are types of sea life, whales eat them
Where do you find the Group 1 and Group 2 metals?
Answer:
far left
Explanation:
Which of the following elements is a metalloid? A. phosphorus B. cobalt C. silicon D. magnesium
Answer: silicon
Explanation:it just is
Respuesta
es la C. silicio
Explanation:
No existe una definición estandarizada de elemento metaloide ni un consenso completo sobre los elementos que son metaloides.
En la clasificación de metaloides se suelen incluir a:
Boro (B)
Silicio (Si)
Germanio (Ge)
Arsénico (As)
Antimonio (Sb)
Telurio (Te)
50 points:
Several thousand years ago, people sought after the truth about the nature of matter by
Answer:
Is this a true or false?
Explanation:
is this a t or f question?
I will pick the brainiest answer! Thanks! :)
1. What is the difference between a chemical and physical change?
2. What is the difference between a property and change?
Answer:
1. What is the difference between a chemical and physical change?
physical change :-
no substance is formedproperties of components before and after are the samereversibleexample:- solubility, melting, condensation and boilingchemical change :-
new substance is formedproperties of components before and after are differentirreversible example:- burning, rusting, oxidation and neutralisation2. What is the difference between a property and change
change:-
A physical change in a substance doesn't actually change what the substance is. It remains the same. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
property:-
A physical property is an aspect that can be observed or measured without being changed. A chemical property may only be observed by changing the chemical identity or substance.
HOPE THIS HELPS
Adding or removing thermal energy causes a change in state of matter.
O True
O False
Answer:"You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster (increased kinetic energy). Particles get farther apart (increased potential energy)."
Explanation:
You can see protons yes or no
No. Not with the naked eye
Beaux has purchased a synthetic material for a product he is launching. What is most likely a benefit of this material?
It is biodegradable.
It can be recycled cheaply.
It is heavy.
It can be mass produced.
Answer:
The answer is D. it can be mass produced
Explanation:
Answer:
The answer is D It can be mass produced.
Explanation:
I just took the test
What is the concentration of a solution of 10. Moles of copper nitrate in 5.0 liters of solution
Answer:
10.5
Explanation:
well we added together so thats the result
Mass number is
O the average atomic mass of an element.
O the total number of electrons in an atom of an element.
O the total number of protons in an atom of an element.
O the total number of protons and neutrons in an atom of an element.
Answer:
4 th is the answer......
help help help!!!!!!!!
Answer:
Your answer is B
The reason why B is right is that even though gravity is pushing down on the marble it is also causing it to go down the ramp. As the marble rolls down the ramp, it gathers speed because it starts out slow and as it gets closer to the ground/table it gets faster because of the revolutions per second that the marble takes while going down.
I'm not sure if this makes sense to you or not. I'm sorry if it doesn't.
Hope This Helps!
ummmm im in 2nd period and in test prep
Define organic and mineral acids
Answer:
In general, organic acids are weak acids and do not dissociate completely in water, whereas the strong mineral acids do. Lower molecular mass organic acids such as formic and lactic acids are miscible in water, but higher molecular mass organic acids, such as benzoic acid, are insoluble in molecular (neutral) form.
will this help?