Answer: C the “disappearance” of a small amount of mass.
Explanation:
Cho các dung dịch: Glucozơ, glixerol, fomanđehit, etanol. Có thể dùng thuốc thử nào sau đây để phân biệt được cả 4 dung dịch trên?
A. Cu(OH)2; B. Dung dịch AgNO3 trong NH3;
C. Na kim loại; D. Nước brom.
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Answer:
chắc là câu B í
Explanation:
(answered on edge)
Calculate the percent by mass of each element.
%N = 35 %
%H = 5.0 %
%O = 60 %
Answer:
N=35%. so 35/100*7 =2.45%
H=5.0 so 5/100*1=0.05%
o=60% so 60/100*8=4.8%
The atomic number of silicon (Si) is 14. What's the electron configuration for silicon? Question 1 options:
A) [Ar] 3p5
B) [He] 1s2 2p6
C) [Ne] 3s2 3p2
D) [He] 2s2 3p2
Answer:
D.[Ne] 3S2 3P2
Explanation:
The electron configuration for silicon is [Ne] 3s² 3p². Hence Option (C) is correct.
What is elctronic configuration ?Electronic configuration, also called electronic structure or electron configuration, the arrangement of electrons in orbitals around an atomic nucleus.
The electron configuration of an element describes how electrons are distributed in its atomic orbitals.
Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.
Silicon belongs to group 14th and 3rd period.Therefore, The electron configuration for silicon is [Ne] 3s² 3p². Hence Option (C) is correct.
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Write down a step by step process of finding the volume of CO₂ produced during the fermentation of C₆H₁₂O₆ at STP.
Answer:
Step 1: Write a balanced chemical equation of the reaction
Step 2: Convert the mass of glucose given to moles of glucose by dividing with the molar mass of glucose, 180 g/mol:
Step 3: Using the mole ratio in the equation of reaction, determine the moles of CO₂ produced:
Step 4: Convert moles of CO₂ to volume in litres of CO₂ at STP:
Explanation:
Fermentation is a complex chemical process whereby microorganisms such as yeast are used in converting carbohydrates such as glucose into ethanol and carbon dioxide under anaerobic conditions:
Step 1: Write a balanced chemical equation of the reaction
Theequation of the fermentation of glucose, C₆H₁₂O₆ at STP is as follows:
C₆H₁₂O₆ (aq) ----> 2 C₂H₅OH (l) + 2 CO₂ (g)
Step 2: Convert the mass of glucose given to moles of glucose by dividing with the molar mass of glucose, 180 g/mol:
Moles of glucose = mass of glucose given/molar mass of glucose = x g/ 1180 g/ mol = x moles of glucose
Step 3: Using the mole ratio in the equation of reaction, determine the moles of CO₂ produced:
From the equation of reaction, 1 mole of C₆H₁₂O₆ produces 2 moles of CO₂.
Therefore, x moles of C₆H₁₂O₆ will produce 2x moles of CO₂
Step 4: Convert moles of CO₂ to volume in litres of CO₂ at STP:
1 mole of a gas at STP has a volume of 22.4 L
1 mole of CO₂ has a volume of 22.4 L
2x moles of CO₂ has a volume of 2x × 22.4 L
possible isomers of C4H9I
Answer:
there are 4 possible isomers
Which of the following is true about science?
It is not influenced by social conditions.
Economic concerns may prevent it from solving problems.
It is not determined by external local factors.
Political conditions are unable to influence it.
Answer:
The correct answer is - Economic concerns may prevent it from solving problems.
Explanation:
Scientific research is influenced by various factors. Science helps in the solving of human problems. However, scientific research can need to be supported by many factors such as Huge amounts of money that need to be invested in performing out particular scientific research to solve problems.
For science, there are requirements of Laboratories and lab supplies such as the equipment and experts need to train the personnel on how to use it.
Thus, economic factors play a huge role in scientific research.
What are isotopes_???
Answer:
Below!
Explanation:
Isotopes are elements with a similar chemical makeup and the same atomic number, but a different atomic mass and number of neutrons . An example of this would be carbon-12, carbon-13, and carbon-14. Three isotopes of the element carbon that have the same 6 protons but have a different neutron count. A simple way to explain isotopes would be to say that they are just different "versions" of an element.
Hope this helps ya! Best of luck <3
Classify each area of study as being a branch of science or not a branch of science. If you're unsure, take your best guess.
Drag each tile to the correct location.
SCIENCE
NOT SCIENCE
astronomy
astrology
biology
chemistry
geology
physics
theology
Answer: Science : Chemistry, astronomy , biology , physics , biology ,geology. Notscience : Astrology and theology
Explanation: Astrology and theology are non scientific areas of study.
help me pls! plsssss
Answer:
Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron.
9. Which is true of a radioisotope that is used to date rock formations?
Answer:
Radiometric dating or radioactive date is the method that uses radioisotope to date the formation of a rock. The age of the rocks will be determined.
Explanation:
Radioactive deterioration is a natural process and results from the unstable atomic core, which releases bits and parts.
These radioactive particles are released as (there are many types). This decline process results in a more equilibrated nucleus, which makes the atom stable when the number of protons and neutrons balances.
This radioactivity is suitable for dating, as a radioactive "parent" item is constantly decaying into a stable "daughter" element.
A single mineral grain or a whole rock may be dated. There are techniques by which the sample is excited in a nuclear reactor and then measured with a mass spectrometer. The isotope (such as in the argon-argon scheme).
Others put mineral grains under a special microscope, fir in the grains with an ionising laser beam that releases the mineral and the isotopes.
The isotopes are measured by a mass spectrometer inside the same machine (an example of this is SIMS analysis).
how is soda made?
this includes sprite, coca cola, dr pepper, exd.
Answer:
Soda all start with watered down corn syrup. To get the carbonation companies have different ways of doing this all of which are very different. The last step is to add artificial and natural flavors like lemon and lime, this is also the step in which sugar and preservatives are added.
Explanation:
I hope this answer your question, srry I couldn't go into detail.
functions of idiophones
is any musical instrument that creates sound primarily by the vibration of the instrument itself without the use of air flow
What is Halo form reaction?
Answer:
Explanation:
I willl go into a bit of detail on the haloform reaction. So the first few steps involve forming an enolate using the base, typically NaOH. THe enolate and go on to do alpha halogenation 3 times. After that, is leaves a trisubstituted alpha methyl carbon with a specific halogen. This is a good leaving group in itself and can carbonyl nucleophillic substitution and turn into a carboxylic acid with a CHZ3- byproduct where Z represents a halogen.
balance chemical reaction of oxalic acid with conc. sulphuric acid
Answer:
Explanation: since oxalic acid is a weak acid it wont provide a strong acidic medium. So in order to provide a strong acidic medium dilute sulphuric acid is added.
Hurry PLEASEEE
How many grams are 1.20 x 10^°25molecules of
calcium iodide?
Please show work!:)
What is the chemical formula of Sulphuric Acid:-
Answer:
sulphuric acid's formula is H²SO⁴
Explanation:
HOPE U WILL FOLLOW
Write down the constituent elements present in the following compounds.
a. Sodium Sulphate
b. Baking Soda
c. Limestone
d. Bleaching powder
e. Ammonia
f. Caustic Soda
g. Glucose
h. Ammonium Carbonate
I. Acetic acid
j. sulphuric acid
Answer:
in sodium sulphate there is sodium an sulphur
Question 22 of 30
What is the balanced form of the chemical equation shown below?
C6H1206(s) + O2(g) → H2O(l) + CO2(9)
A. CH 0(s) + O2(g) → H2O(1) + CO2(g)
B. CoH1206(s) + O2(g) → 12H2O(l) + 6CO2(g)
C. C6H1206(s) + O2(g) → H20(1) + CO2(g)
D. CoH 206(s) + 602(g) → 6H2O(l) + 6CO2(g)
SU
Answer:
C6H12O6+6O2--->6CO2+6H2O
Explanation:
So I went through all the answers and could not find the right one amongst. If I'm not wrong the reaction above is the reaction for respiration. The nearest answer is D but unfortunately the first reactant isn't in accordance with that which the question has given.
Infrared waves are an example of heat transfer by
A. convection
B. radiation
C. conduction
D. motion of the air
Answer:
convection is my correct answer
Which of the following materials contains a base?
a. Stomach digestive juices
b. Orange juice
c. Ammonia window cleaner
d. Vinegar
Answer:
c. ammonia window cleaner
Explanation:
Window cleaners contain ammonia (a base) for the purpose of removing the dust and grease on the windows.
digestive juices, orange(a citrus) juice, and vinegar are all highly acidic.
... give me brainliest please :)) ...
An aqueous solution contains
32.7% KCl (weight/weight %).
How many grams of water (H20) are contained in 100 g of this solution?
Answer:
67.3g
Explanation:
%(w/w) = mass of solute/total mass of solution × 100
According to this question, an aqueous solution contains 32.7% KCl (w/w%). Firstly, we find the mass of the solute (KCl) as follows, if the mass of solution is 100g:
32.7 = mass of solute/100 × 100
mass of solute (KCl) = 32.7g
Mass of solution = mass of solvent (water) + mass of solute (KCl)
100g = x + 32.7g
x = 100 - 32.7
x = 67.3
Hence, the mass of water contained in the 100g solution is 67.3g.
iron filings react with sulphuric acid to produce hydrogen and iron(II) sulphate
Answer:
is this true and false? then its true
Explanation:
Answer:
Fe(s) + H2SO4 (aq) ---> FeSO4 (s) + H2 (g)
Explanation:
HF or HCl which can form the hydrogen bond? Explain your answer.
Answer:
can only form one hydrogen bond each
Explanation:
can only form one hydrogen bond each
What is the energy of a photon emitted with a wavelength of 448 nm?
O A. 2.97 x 10-22 J
O B. 4.44 x 10-19 J
O C. 8.91 x
10-23 J
O D. 1.48 x 10-27 J
Answer: B is the correct answer
Explanation:
The energy of a photon is 4.44×[tex]10^{-19}[/tex]J for the wavelength of 448 nm.
So, option (B) is correct. This can be calculated by using the energy formula.
The energy of a photon:The energy of a photon is said to be photon energy. It is directly proportional to the photon's electromagnetic frequency and inversely proportional to the wavelength. If the frequency of the photon is high then its energy is also high.
The energy of a photon, E=hc/λ
Given data:Given that,
λ = 448nm
h= 6.63×[tex]10^{-34}[/tex]J/s
Calculating the energy:E = 6.63×[tex]10^{-34}[/tex]×3×[tex]10^8[/tex]/448×[tex]10^-^9[/tex]
E = 4.44×[tex]10^{-19}[/tex] J
Hence option (B) is correct.
Therefore, the energy of a photon emitted with a wavelength of 448nm is 4.44×[tex]10^{-19}[/tex] J.
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What is occurring during the flat section of the graph below on the red arrow labeled boiling, between liquid and gas? gas (3.) OO liquid temperature solid time (minutes) O A. Heat is being absorbed, allowing particles of the liquid to overcome the atmospheric pressure. B. Heat is being absorbed, allowing particles of the liquid to overcome the vapor pressure. C. Heat is being released, allowing particles of liquid to overcome the pressure, and is why the temp does not increase. D. The temperature is no longer increasing even though heat is still being added because the heat is being absorbed to lower the melting point
The three aspects of the measuring process are units, systems, and instruments.
O True
O False
NEXT QUESTION
ASK FOR HELP
TURNI
Answer:
the answer for that is false
Answer:
false
Explanation:
the ans is falsehope it helpsA student wants to separate a mixture of salt and water in a laboratory (a) Describe how the student can obtain both salt and water from the salt solution
Answer:
okay so basically what you are being tested is if you know the difference between simple and fractional distillation and okay you can evaporate the mixture but you won't obtain water so you will use simple distillation to obtain both salt and water
Which compound in 1 mol/dm3 solution has the highest PH value? a) Ethanoic acid b) Sodium chloride c) Sodium hydroxide d) Hydrogen chloride
Answer:
Explanation:
A. Ethanoic acid-acetic acid being weak acid dissocated weekly and turns solution to weakly acidic, ph will be between 4-7,
B. Hydrochloric acid - the solution would be acidic- with lots of H+ ions, Ph will be between 1-4,
C. Sodium chloride - solution prodcued netural Na+ and Cl- hence wont affect ph of solution will be equalt to 7.
D. Sodium hydrogen carbonate-NaHCO3 is weak base and the PH will be above 7,
Identify the correct mole ratio for each substance.
Sodium chloride (NaCl)
Na:Cl = 1: _
Ammonium nitrate(NH.NO3)
H:0 = 4: _
Answer:
The mole ratio of H : O in ammonium nitrate is 4 : 3.
Explanation:
We are given a compound named ammonium nitrate having formula
There are 3 elements in this compound which are nitrogen, hydrogen and oxygen.
To calculate the mole ratio, we write the ratio of their subscripts. For this compound,
Isobutane (C4H10) is one of the components of natural gas. Which equation
shows the balanced combustion reaction for isobutane?
A. C4H10 + O2 + 4CO2 + H2O + heat
B. C4H10 + O2 + CO2 + H2O + heat
C. C4H10 + O2 + 4C02 + 5H20 + heat
D. C4H10 +6.502 → 4002 + 5H20 + heat
SUBMIT
Answer:
D. C₄H₁₀ + 6.5O₂ → 4CO₂ + 5H₂O + heat
Explanation:
The reaction of the combustion of isobutane with oxygen is presented as follows;
C₄H₁₀ + 6.5O₂ → 4CO₂ + 5H₂O + heat
In the above reaction, the number of elements on the reactant side are;
4 carbon, C, atoms, 10 hydrogen, H, atoms, and 13 oxygen, O, atoms
The number of elements on the product side of the above chemical reaction are;
The number of carbon atoms, C = 4
The number of hydrogen atoms, H = 10
The number of oxygen atoms, O = 13
Therefore, the number of atoms on the reactant side of the chemical equation are equal to the number of atoms on the product side, and the combustion reaction for isobutane is balanced.
