Answer:
See explanation below
Explanation:
In order to do this, you are missing two important data, which are the initial temperatures of the water and the rod.
For practical purposes, I will assume this data, and then you'll just replace the procedure with your data to get an accurate result.
So, for this exercise, I will assume that the rod of Chromiun was heat to 100 °C and then cooled with water at 20 °C, so the final temperature is 54.5 °C.
To get the specific heat, we need to use the following expression:
q = m.C.ΔT (1)
Where:
q: Heat of the substance/compound
m: mass
C: specific heat
ΔT: Difference of temperature of the mixture.
With this expression, we need to calculate first the heat of the water, because:
q₁ + q₂ = 0
Therefore, with the value of the transfered heat, we can determine later the specific heat. So, As we have the specific heat of water which is 4.18 J/g °C, and the temperature and mass, we can determine the heat of the mixture:
ΔT = 54.5 - 20 = 34.5 °C
q₁ = 35 * 4.18 * 34.5
q₁ = 5047.35 J
Now, we can determine the specific heat of the rod:
q₁ = -q₂
-5047.35 = 323.98 * (54.5 - 100) * C
-5047.35 = -14741.09C
C = 0.34 J/g °CHope this helps
You write an invisible message on paper with lemon juice - when you heat the paper, the writing turns brown. Chemical or physical change
Answer: Chemical Change.
Explanation: Lemon juice has properties that, when heated, turn the paper brown. In the invisible ink science experiment, that is why it is used. In lemon juice, the acid prevents peeled fruit from browning, like apples and pears. The lemon juice has a bitter taste and is acidic.
Please help!! I'll name you brainliest!!
Answer:
lost is the answer to this question but if I am wrong I am so sorry for that
I NEED HELP FAST PLEASE
*please answer correctly*
Will mark brainliest thank you!!
Answer:
Explanation:
Using Charles Law ,
[tex]\frac{V1}{T1}=\frac{V2}{T2}[/tex]
Using this formula we have ,
V1= 200cm^3
T1=40+273.15 = 313.15 K
T2 = 100+273.15 = 373.15 k
V2= ?
Hence using above formula simplify it we will get ,
V2 = 238.3 cm^3
Answer:
i dont know that plzzz help me tooooo
True or False: There are five (5) of Newton's Laws of Motion *
Answer:
False
there is three
Explanation:
Three laws are combined together which is further known to us as Newton ’s three laws of motion. These three newton’s laws of motion are: Law I – Newton’s first law of motion Law II – Newton’s second law of motion
Hope this helps :)
What would the world be like without elements? please
Answer:
It would be nothing. Quite literally nothing. No Oxygen, no dirt, no anything.
Explanation:
Answer:
Nothing
Explanation:
Everything we have in our world is made up of elements. Without them, we would have nothing.
Urgent please help!!!
Describe what you think is your responsibility in taking care of the natural
world in which you live.
Answer:
Well I would say " I think my responsibility is recycling, gardening, picking up litter, and using less pollution. All of this stuff is very important. Sometimes, it's the tiny things that change the world for the better."
I hope this helped! Feel free to add your own little tweaks.
How do the atomic number and the mass number of an element
change after beta decay?
A. Atomic number stays the
same; mass number
increases by 1.
C. Atomic number increases by
1; mass number stays the
same.
B. Atomic number stays the
same; mass number
decreases by 1.
D. Atomic number decreases by
1; mass number stays the
same.
Answer:
A.
Explanation:
Hi, help with these two questions.
1. Write the isotope notation for an atom with 9 protons and an atomic mass of 20.
2. Write the isotope notation for an atom with 13 protons and 12 neutrons.
Answer:
Answered below
Explanation:
1) Atomic number is usually the number of protons
Since the atom is a neutral atom, Number of protons is equal to the number of electrons.
Thus means that we have 9 electrons and our atomic number is 9.
Atomic mass number is given as 20.
The is topic notation makes use of the atomic number and mass number.
Atomic number of 9 denotes fluorine.
Thus, the isotopic notation is written as attached;
2) we are told that an atom has 13 protons and 12 neutrons.
Similar to A above,
Atomic number is 13.
Now, number of neutrons + number of protons = mass number.
Thus;
Mass number = 13 + 12 = 25
Element with atomic number of 12 is magnesium
Thus,isotopic notation is as attached.
describe a difference in our inner planets and outer planets
Can someone help me with number 3 thanks
Answer:
Difficult Question but I would say no
Explanation:
I say no because the whole premise of a chemical reaction is the reaction to new bonds and bond losses happening due to the introduction of a new substance. If the substance hasn't changed at all, it wouldn't be a chemical reaction because their would be nothing reacting.
CAN y’all please help me ASAP with these questions :)
Answer:
1. Force
2. contact force
3. non-contact force
4. magnetism
5. strength and direction
6. length, direction
7. newtons
Explanation:
You're welcome <3
Name 5 things that the periodic table includes about 1 atom for each element:
1.
2.
3.
4.
5.
Answer:
They are listed below
Explanation:
The 5 things that the periodic table includes are;
1. Name of the element
2. The symbol of the element
3. Atomic number of the element
4. Relative atomic mass
5. Electron configuration
______ meters = 177 millimeters
Answer:
117 millimeters = 0.117 meters
Explanation:
This is using unit conversions. There are 1000 millimeters in 1 meter, so you would divide your starting value, 117 millimeters by 1000 millimeters. The units will cancel because they are being divided by themselves and you are left with 0.117 meters.
What is specific gravity in minerals?
Specific gravity is the "heaviness" of a mineral. It is defined as a number that expresses the ratio between the weight of a mineral and the weight of an equal volume of water.
Answer:
The ratio of it's mass of an equal volume of water.
Explanation:
Which of the following has the smallest atomic radius?
a B
b Al
c F
d N
e Ga
Answer:
c. F
Explanation:
As you go top to bottom down a column of the periodic table, atomic radius increases.
As you go left to right across a period of the periodic table, atomic radius decreases.
Knowing this trend, that means that the smallest atomic radius would be located in the top right of the periodic table. The closest element to that point is fluorine, or answer C.
b. MgF2
Name the compound
Answer:
Magnesium Difluoride
Explanation:
Mg = magnesium
F = fluoride
F2 = difluoride (prefix "di" indicates 2)
A student did an investigation to determine the effect the amount of air would have on plant growth. She planted identical
plants in 4 separate closed containers with different volumes of air. She measured the height of the plants after they had
grown for 3 weeks.
What is the dependent (responding) variable in her investigation?
Answer:
Explanation:
The responding variable always is measured against the variable that you have control over.
In this case, you have control over the volume of air.
The responding variable is the amount the plant has grown. This would be a good long term experiment to try for a science fair or just because you might be interested. It's a good simple idea.
What is the primary difference between two different isotopes?
Answer:
Because different isotopes have different numbers of neutrons, they do not all weigh the same or have the same mass. Different isotopes of the same element have the same atomic number. They have the same number of protons. The atomic number is decided by the number of protons.
Hope this helps!!!!
Explanation:
I think it’s D but I’m not sure.. Please help!
Answer: I think it’s D?
Explanation:
Answer:
D.
Explanation:
Weathering, erosion and deposition are processes that can wear a mountain down.
(blank) are the fastest form of radiation?
Answer: Gamma particles
Answer:
Gamma rays, are the fastest.
Explanation:
They literally move at the speed of light, I hope this helps you.
If a molecular formula is C8H12O2 , what is the empirical
formula?
a
C4H30
b C4H60
C С2H3o
C2H30
d C8H1202
If a section of DNA has 15% thymine, how much adenine will it have?
1. 15%
2. 30%
3. 60%
4.85%
Answer:
15% adenine
Explanation:
Thymine and adenine are a nitrogenous base pair so they would equal the same.
If a person weighs 125 pounds, 8 oz, how many mg do they weigh?
Answer:
ok so you would just weigh 125 because 16 oz is 1 pound
Explanation:
Type the correct answer in the box. Spell all words correctly.
What is this process called?
*blank* involves subjecting the evidence and the reference or standard to the same tests. This process determines if two or more
objects share a common origin.
What is the formula for nickel || dichromate
Answer: Cr2NiO7 is the molecular formula for nickel II dichromate.
Match the number of neutrons to the correct isotope by studying the atomic number and mass number of each isotope. Drag the items on the left to the correct location on the right.
these are the correct answers
pleaseeeeeeeeeeeeeeeeeeeeeeee helppppppppppp
Approximately how many grams of KBr will dissolve in 100g of water at 50C?
60g
70g
80g
90g
Answer:
the answer would be to your problem here is 90g
Explanation:
please help i will mark brainlist
Answer:
V= 21 cubic cm (( I am not sure about density ))
Explanation:
V= L×W×H
What is the chemical formula for Tetraphosphorous Pentachloride ?
Answer:
CH4
Explanation:
Organisms that are made up of prokaryotic cells are NOT ____________.
Question 4 options:
Bacteria
Simpler than organisms made up of Eukaryotic celled organisms
All of these are true about prokaryotic cells
Multicellular
Answer:
Multicellular
they are single celled