A molecular formula consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecule. The molecular formula for a compound can be the same as or a multiple of the compound's empirical formula.
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Answer:
Molecular formulas describe the exact number and type of atoms in a single molecule of a compound. The constituent elements are represented by their chemical symbols, and the number of atoms of each element present in each molecule is shown as a subscript following that element’s symbol. The molecular formula expresses information about the proportions of atoms that constitute a particular chemical compound, using a single line of chemical element symbols and numbers. Sometimes it also includes other symbols, such as parentheses, dashes, brackets, and plus (+) and minus (–) signs.
Hope it's helpfulIn a lab experiment, the decay of a radioactive isotope is being observed. At the beginning of the first day of the experiment the mass of the substance was 200 grams and mass was decreasing by 11% per day. Determine the mass of the radioactive sample at the beginning of the 10th day of the experiment. Round to the nearest tenth (if necessary).
Answer:
The correct answer is - 62.36 g.
Explanation:
Given:
Mass of substance - 200
decreasing rate - 11% per day
mass at the beginning of the 10th day - ?
Solution:
F(x) = 200*(1 - 11)^x
here x the time
F(x) = 200* (0.89)^10
= 200*0.3118
= 62.3634
Thus, the correct answer is 62.36 g.
write the recation of formation of ions by fluorine and potassium
Answer: The reaction of formation of ions by fluorine and potassium is [tex]K^{+} + F^{-} \rightarrow KF[/tex].
Explanation:
Atomic number of potassium is 19 and its electronic distribution is 2, 8, 8, 1. So, in order to attain stability it needs to lose 1 electron due to which it forms [tex]K^{+}[/tex] ion.
Atomic number of fluorine is 9 and its electronic distribution is 2, 7. In order to attain stability it needs to gain one electron and hence forms [tex]F^{-}[/tex] ion.
Therefore, when both these ions come in contact with each other then it leads to the formation of KF compound.
The reaction equation for this is as follows.
[tex]K^{+} + F^{-} \rightarrow KF[/tex]
Thus, we can conclude that the reaction of formation of ions by fluorine and potassium is [tex]K^{+} + F^{-} \rightarrow KF[/tex].
how many elements have been discovered so far by scientists
Answer:
118 elements have been discovered so far
Explanation:
How much heat is absorbed if 75.4 g of CO2 reacts?
Answer:
6x
Explanation:
Answer:
Δ
H
=
−
389 kJ
Question 7 of 25
The diagram shows the direction trade winds blow below and above the
equator. What causes the trade winds to move at an angle rather than straight
toward the equator?
for Easterlies
Answer:
A. The Coriolis Effect bends them
Explanation:
The Coriolis Effect is a force that causes objects and other things that are not attached to the ground and which are moving over a large distance around the Earth such as the trade winds or air planes, to take an apparent curved path in their motion rather than moving in a straight line, due mainly to the rotation of the Earth
The Coriolis Effect is named after French mathematical physicist Gaspard-Gustave de Coriolis
Choose all the answers that apply.
Plasma is made of _____.
ions
clumped atoms
neutral atoms
free electrons
free protons
Answer:
neutral atoms
Explanation:
Someone help me pls I need this correct
Answer:
Outermost layer of skin: Epidermis
Raised line of skin: friction ridges
Fingerprint pattern: Whorl
Small details in ridges: minutia
(I believe this is correct)
Which element would release the most energy while adding an electron to a neutral atom in the gas phase?
Answer:
bromine (br)
Explanation:
edg 2021
What is a mixture called when it has its different components mixed unevenly within the substance?
Heterogeneous mixture
Homogeneous mixture
Impure mixture
Pure mixture
Answer:
Heterogeneous mixture...is the answer
The dude above me is right. I thought he was wrong, so I put A but it turns out he was right!
When you perform a stoichiometry calculation, you are determining the ...
A) actual yield
B) theoretical yield
C) percent yield
Answer:
B. Theoretical yield
Explanation:
Hope its help:)
the swallowtail caterpillar is an example of a ?
Answer:
B) Consumer COnsumer COnsumer
Answer:
Consumer
Explanation:
It is a consumer
An inflated balloon contains X air molecules.After some time the volume of the balloon is found to be the half at the same temperature and pressure when a few air molecules are expelled out. a)How many molecules will be there in the balloon now? b) Which is the gas law associated with this?
Answer:
See explanation
Explanation:
According to Avogadro's law, the volume of a given mass of gas is directly proportional to the number of molecules of gas present at constant temperature and pressure.
Hence; V1/n1 = V2/n2
The implication of this is, if there were X molecules present and the volume of the balloon is halved, the number of molecules of gas present is also halved. So, we now have X/2 number of gas molecules present in the balloon.
This is in accordance with the statement of Avogadro's law.
what is the product of the reaction between arsenic and oxygen
a. AsO
b. AsO2
c. As3O2
d.As2O3
Answer:
d
Explanation:
As + O2 -------->as2o3
Which statement describes an Arrhenius acid
Answer:
According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs. Hence, the correct statement is arrhenius acid produces hydrogen ions in solution.
You have learned how to take steps that are exactly 1m long. You take 12 steps north, then 15 steps north, 35 steps south, 11 steps south, then 16 steps north. What distance have you walked? What is your total displacement?
Answer:
you have walked 69 steps but your current location is -13
Which characteristic of water allows its molecules to form hydrogen bonds? (1 point)
Answer:
Water molecule is polar.
Explanation:
The partial negative charge on the O of one molecule can form a hydrogen bond with the partial positive charge on the hydrogens of other molecules.
help? why is chem SO HARD
Answer:
D. The potential energy of the products is greater than the potential energy of the reactants.
UwU
a molecule made of carbon and oxygen atoms
Answer:
Carbon monoxide
Explanation:
The molecule has the carbon and oxygen atoms in equal amounts.
What must happen to the atoms before they are accelerated in the mass spectrometer?
Answer:
Atoms and molecules can be deflected by magnetic fields - provided the atom or molecule is first turned into an ion. Electrically charged particles are affected by a magnetic field although electrically neutral ones aren't. The atom or molecule is ionised by knocking one or more electrons off to give a positive ion.
Explanation:
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The atom must first be ionized.
The mass spectrometer is an important analytical tool in chemistry. It is used to identify atoms and molecules.
However, the atom or molecule to be analysed must first be converted into an ion.
This happens when the instrument imparts an electrical charge to the molecule or atom then the electrically charged ions are read as electrical current. The ion is accelerated towards a detector which analyses the deflected ions.
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Why do we not see a solar and lunar eclipse every lunar cycle?
Answer:
Explanation: We don't see lunar eclipses every cycle because the Moon's orbit is tilted five degrees from Earth's orbit around the Sun. And when an eclipse occurs the earth passes directly between Sun and Moon.
The photographs show comb jellies and an anglerfish in a benthic ecosystem
Which feature of these organisms' bodies allows them to withstand the
extreme pressure of this environment?
The organism in the bethic zone can survive in such high pressure area. This is because the organism there have no air pockets that provides them the ability to be balanced in the water
For which of the following prostheses would biocompatibility not be a serious
issue?
A. A hearing aid
B. Contact lenses
C. An engineered arm connected to nerve endings so that it can
respond to brain signals
D. A heart valve
a hearing aid.
it doesn't get in contact with fluids (like contact lenses) and doesn't get implanted, so it got not much to do with the immune system
Answer:
hearing aid
Explanation:
i just took tha test
PLEASE HELP PLS LFHLFATOI;RHG
Answer:
C. A model of a water molecule
Explanation:
H20, model shows 2 H,s (H2) and 1 O (O) which makes H2O. It's a model and not a real life picture of a molecule.
Answer:
C. A model of a water moleculeExplanation:
2 hydrogen + Oxygen= water molecule#CarryOnLearning
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A molecule
B compound
C atom
D element
Answer:
D. Element.
Explanation:
Atoms form elements. Elements form molecules. Molecules form compounds.
2500 cal of heat are absorbed by 150 grams of water that is initially at 23°C, what is the final temperature of the water?
Answer:
H=MC∆T
Heat = Heat absorbed or given off
M=Mass
C=Specific Heat Capacity of substance (Water in thus case). It has a Specific Heat capacity of 4200J/kg.k
∆T= Temp Change (T2-T1)
I'll solve with My Heat in Joules.
The heat is given in Calorie
1Cal = 4.186J
2500cal = 10,465J.
∆T= H/MC
=10465/0.15(4200)
=16.6°C
∆T=16.6
T2 - T1 = 16.6
T2 = 16.6+T1
T2 = 16.6 + 23
T2 = 39.6
Approx. 40°C
Which gas would effuse more slowly:
Xe
CO2
CH4
N2
N2 should be the gas to effuse more slowly
What is the molecule shown below?
A. 2,3-methylpentane
B. 3-propylbutane
C. Heptane
D. 2-butylpropane
Answer:
2,3–dimethylpentane
Explanation:
To know which option is correct, we shall determine the name of the compound.
To obtain the name of the compound, do the following:
1. Determine the longest continuous carbon chain. This gives the parent name of the compound.
2. Identify the substituent group attached to the compound.
3. Locate the position of the substituent group by giving it the lowest possible count.
4. Combine the above to obtain the name of the compound.
Now, we shall determine the name of the compound as follow:
1. The longest continuous carbon chain is 5. Thus, the parent name of the compound is pentane.
2. The substituent group attached is methyl (–CH₃)
3. There are two methyl group attached to the compound. One is located at carbon 2 and the other at carbon 3.
4. Therefore, the name of the compound is:
2,3–dimethylpentane
None of the options are correct.
Inside a car that was at STP, a 1.33 L bottle warms up to 130 C. If the volume of the bottle remains constant, what is the pressure, in atm, inside the hot water bottle?
Answer:
[tex]P_2=1.48atm[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to infer this problem is about the application of the Gay-Lussac's gas law to relate the initial and final pressure and temperature as shown below:
[tex]\frac{P_2}{T_2} =\frac{P_1}{T_1\\ }[/tex]
Thus, solving for the final pressure, P2, and using the temperatures in Kelvins, we obtain:
[tex]P_2 =\frac{P_1T_2}{T_1 }\\\\P_2 =\frac{1atm*403.15K}{273.15K}\\\\P_2=1.48atm[/tex]
Regards!
Use the periodic table to identify the element indicated by each electron configuration by typing in the
chemical symbol for the element.
Answer:
Explanation:
1s22s22p6: Ne 1s22s22p63s23p3: P 1s22s22p63s23p64s1: K 1s22s22p63s23p64s23d8: Ni 1s22s22p63s23p64s23d104p65s24d3: Nb
We have that an element indicated by its electron configuration, we can determine its Atomic number by selecting the electron represented on each orbit of the atom around the nucleus
Hence using the Periodic table to read the its Atomic Number
The Periodic table is categorized using the atomic number of elements and symbols are to aid search as well
For an element indicated by its electron configuration we can determine its Atomic number by selecting the electron represented on each orbit of the atom around the nucleus
Hence using the Periodic table to read the its Atomic Number
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The Ideal Gas Law is as follows: PV = nRT.
Rearrange the equation for each variable.
P =
V=
n =
R=
T =
Answer:
p=nRT/V
v=nRT/P
n=PV/RT
t=PV/nR
