Noble gases exist as monatomic gases, which means that their molecules consist of a single atom.
What are noble gases?A "Noble gas" can be defined as a gas which does not undergo chemical reactions. Examples of Noble gases are helium, Neon, Argon, Krypton, Xenon, and Radon.
Properties of noble gases:
Noble gases are the least reactive of all elements because they have eight valence electrons, which fill their outer energy level. That's why noble gases rarely react with other elements and form compounds.
Atoms of noble gases do not bond with other gases. Only helium exists as atoms of Helium, not as diatomic molecules. Helium does not form compounds with atoms of other elements.
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Waste water from nuclear power plants is generally:
Answer:
Nuclear energy produces radioactive waste
A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years.
Which of the following is a double replacement reaction?
K2S + CoCI2 -> 2KCI + CoS
Ca + 2H2O -> Ca (OH)2 + H2
CaO + H2O -> Ca(OH)2
2KCIO3 -> 2KCI + 3O2
The reaction that exemplifies a double replacement reaction is as follows: K2S + CoCI2 -> 2KCI + CoS, which is option 1.
What is a double replacement reaction?A double replacement reaction is a type of reaction in which two elements are substituted in the reacting compounds.
In the reaction given as follows:
K2S + CoCI2 -> 2KCI + CoS
Pottasium replaces cobalt in Cobalt chlorideSulfur replaces chlorine in Cobalt chlorideTherefore, the reaction is a type of double replacement reaction.
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If a gas occupies 1532.7 mL at standard temperature, what volume does it occupy at 49.4 ºC if the pressure remains constant?
a. 1810
b. 1300
c. 276
d. 3.80e5
Answer:
a. 1810mL
Explanation:
When conditions for a gas change under constant pressure (and the number of molecules doesn't change), it follows Charles' Law:
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex] where the temperatures must be measured in Kelvin
To convert from Celsius to Kelvin, add 273, or use the equation: [tex]T_C+273=T_K[/tex]
For this problem, one must also recall that standard temperature is 0°C (or 273K).
So, [tex]T_1 = 273[K][/tex], and [tex]T_2 = (49.4+273)[K]=322.4[K][/tex].
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
[tex]\dfrac{(1532.7[mL])}{(273[K])}=\dfrac{V_2}{(322.4[K])}[/tex]
[tex]\dfrac{(1532.7[mL])}{(273[K\!\!\!\!\!{-}])}(322.4[K\!\!\!\!\!{-}] )=\dfrac{V_2}{(322.4[K]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}(322.4[K]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})[/tex]
[tex]1810.04571428[mL]=V_2[/tex]
Adjusting for significant figures, this gives [tex]V_2=1810[mL][/tex]
When Earth receives energy from the Sun, ____. a. some energy is reflected back into space b. some is absorbed by the atmosphere c. some is absorbed by land and water on Earth's surface d. all of the above Please select the best answer from the choices provided A B C D
Answer:
D - all of the above
Explanation:
how many atoms of of titanium are present in a sample containing 0.375 moles Ti
2.258302785 x [tex]10^{23}[/tex] atoms of titanium are present in a sample containing 0.375 moles of Ti.
What are moles?A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
To find the number atoms we need to multiply by 6.02214076 × 10^{23}.
0.375 moles x 6.02214076 × [tex]10^{23}[/tex]
2.258302785 x [tex]10^{23}[/tex]
Hence, 2.258302785 x [tex]10^{23}[/tex] atoms of titanium are present in a sample containing 0.375 moles of Ti.
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Find the ratio of the volume divided by the
temperature for the first data pair. Use significant
figures.
V/T=0.72/276= 0.002 ✓
COMPLETE
Now do the same computation for all six pairs of
values. What is the average of all six fractions V/
T?
From the pair of values given, the ratio of the volume to the temperature for the first data pair is, 0.0026 cm³/K
What is a Ratio?A ratio is a comparison between two quantities showing how much one quantity differs from another.
From the data given, the first data pair is as follows ;
Temperature = 276 KVolume = 0.72 cm³Ratio of volume to temperature = volume / temperature
Ratio = 0.72 / 276
Ratio = 0.002608 cm³/K
The significant figure's rule for division is the least number of significant figures used in the operation.
The least significant figure of the values given is 2.
Therefore, the ratio of the volume to the temperature for the first data pair is 0.0026 cm³/K
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Answer:
0.0026
Explanation:
edge 2022 it's the same answer for both parts
Samantha opened a tin of white paint. The paint consisted of a liquid and particles of titanium dioxide that are insoluble in the liquid.The paint had separated into two layers What type of substance in the titanium dioxide
Titanium dioxide is a type of mixture if particles of titanium dioxide are insoluble in the liquid.
What is a mixture?A mixture is composed of one or more pure substances in varying compositions.
A mixture is a material made up of two or more components joined together, but not chemically combined. In a mixture, a chemical reaction does not occur and each of its components maintains its identity and chemical properties.
A compound is a substance formed by the chemical combination of two or more different elements from the periodic table. The elements of a compound cannot be divided or separated by physical processes. They are not mixtures or alloys
An element is a type of matter made up of atoms of the same class. It is an atom with unique physical characteristics, a substance that cannot be decomposed by a chemical reaction.
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Which of the following is used as a thermal insulator?
A. A hot plate to keep the mug warm
B. A ceramic mug filled with coffee
C.a lid to cover the coffee mug
D. A metal spoon to stir the coffee
How many moles of NO2 form when
63.25 g N2O5 decompose?
2N2O5→ 4NO2 + 0₂
Answer:
1.1713 moles
Explanation:
RFM of N2O5= (14*2)+(16*4)=108
Moles of N2O5= Mass/RFM= 63.25/108= 0.5856 moles
Mole ratio of N2O5:NO2 = 2:4
Therefore moles of NO2= 4/2*0.5856= 1.1713 moles
What’s the name of this compound?
Answer:
decane
Explanation:
decane has 10 carbon and 22hydrogen
An atom is neutral because it has the same number of electrons as it has???????????????????????????????????????????????????????????
Answer:
protons
Explanation:
the protons and electrons of an element are the same amount however the neutrons are a different amount
What does a high number on the pH scale say about a solution?
OA. The solution is basic.
OB. The solution is hot.
C. The solution is neutral.
OD. The solution is acidic.
Explanation:
A is cortect answer dsfa
The table below shows the electronegativity values of various elements on the periodic table.
Electronegativities
1
2
15 16 17
24
3A 4A 5A 6A 7A
Li Be
8
F
1.0 1.5
2.0 2.5 3.0 3.5 4.0
Na Mg
P
0.9 1.2
1.5 1.8 2.1 2.5 3.0
K
Ca
Ge As Se Br
1.8 2.0 2.4 2.8
0.8 1.0
Rb Sr
2.5
0.8 1.0
Cs Ba
0.7 0.9
Which pair of elements would form an ionic bond?
O carbon (C) and oxygen (0)
H
2.1
a
ON
00
O
An ionic bond can be formed between Na and O, Mg and F or Li and H since they have large differences in their electronegativity values.
What are ionic bonds?Ionic bonds are the bonds present in ionic compounds.
Ionic bonds are formed due to the electrostatic forces of attraction that exist between oppositely-charged ions.
Ionic bonds are formed between elements whose electronegativity values are far apart.
Thus, based on the given electronegativity values, an ionic bond can be formed between Na and O, Mg and F or Li and H.
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An ionic bond can be formed between Na and O, Mg and F or Li and H since they have large differences in their electronegativity values.
What are ionic bonds?Ionic bond, also called an electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.
Metal atoms form positive ions, while non-metal atoms form negative ions. The strong electrostatic forces of attraction between oppositely charged ions are called ionic bonds.
Ionic bonds are formed between elements whose electronegativity values are far apart.
Thus, based on the given electronegativity values, an ionic bond can be formed between Na and O, Mg and F or Li and H.
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54.0 g Al reacts with 64.0 g O2 to
form Al2O3 according to the equation.
4A1+30₂ → 2Al2O3
Al: 26.98 g/mol Al2O3: 101.96 g/mol
How many grams of Al2O3 form
from 54.0 g Al?
[?] g Al₂O3
Answer:
102 g Al₂O₃
Explanation:
To find the mass of Al₂O₃, you need to (1) convert grams Al to moles Al (via molar mass), then (2) convert moles Al to moles Al₂O₃ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles Al₂O₃ to grams Al₂O₃ (via molar mass). It is important to arrange the ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs to reflect the given values.
Molar Mass (Al): 26.98 g/mol
Molar Mass (Al₂O₃): 101.96 g/mol
4 Al + 3 O₂ ---> 2 Al₂O₃
54.0 g Al 1 mole 2 moles Al₂O₃ 101.96 g
-------------- x ----------------- x ----------------------- x ---------------- = 102 g Al₂O₃
26.98 g 4 moles Al 1 mole
Answer: 102 for 54.0 and 136 for 64.0
Explanation:
Kajal is a compound or a mixture?
Please help ASAP
Is there any evidence that a reaction has occurred? (One or more answers may be true.)
a. No, there is no change in the solution.
b. Yes, because H2SO4 is being added.
c. Yes, a precipitate formed.
d. Yes, there is a change in conductivity.
Determine if the following statement is true or false, and why. “A hypothesis can be proven true.”
A. False, it should read “A hypothesis can only be proven false.”
B. True
C. False, it should read “A hypothesis cannot be tested.”
D. False, it should read “A hypothesis can’t be proven true if it is falsifiable.”
it's true. answer is B.
a hypothesis is a stage before formation of theory. so when we put forward a hypothesis to prove something (in scientific observation) it can be proven true with the experiments conducted.
but of course it's can be proven wrong too, after the experiments conducted. then it is disregard.
a proven hypothesis (a true hypothesis)is the reason for theories.
Answer:
it's true. answer is B.
a hypothesis is a stage before formation of theory. so when we put forward a hypothesis to prove something (in scientific observation) it can be proven true with the experiments conducted.
but of course it's can be proven wrong too, after the experiments conducted. then it is disregard.
a proven hypothesis (a true hypothesis)is the reason for theories.
Explanation:
hope this helps :)
blocks on the periodic table will not list a(n):
Blocks on the periodic table will not list a mass number of elements in this scenario.
What is Periodic table?This table comprises of elements in order of their atomic number which determines their chemical properties.
It contains the atomic number but however doesn't contain the mass number of the elements.
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2 attempts left check my work
be sure to answer all parts.
calculate the density of a solid substance if a cube measuring 2.72 cm on one side has a mass of 129 g.
Answer:
6.41 gm / cm^3
Explanation:
cube volume = 2.72 x 2.72 x 2.72 cm^3 = 20.124
Density = mass / volume = 129 g / 20.124 cm^3 = 6.41 gm / cm^3
what will happen when a wax candle burned in air with limited oxygen?
Answer:
The molecules of carbon dioxide are heavier than air. When a result, as they descend over the flame and candle, they push the oxygen and other air molecules out of the path. The oxygen can no longer react with the wax when it is pushed away from the wick. The flame is put out as a result.
Answer:
if the candle is burned in air with limited oxygen supply the candle will go out of fire as the oxygen is reducing....
Explanation:
Hope It Helps!!!
Which type of molecule is made from amino acids?
Answer:
protein molecule
Explanation:
Answer: Protein
Explanation:
Amino acids from protein molecules.
What is the chemical formula for acetic acid?
CH3COOH
Explanation:
hope I helped
if you get the answer right mark me as brainlyst
The limiting reactant, O2, can form up to 2.7 mol Al2O3. What mass of Al2O3 forms?
Al2O3 : 101.96 g/mol
[?] g Al₂O3
Answer:
280 g Al₂O₃
Explanation:
To find the mass, you need to multiply the given value by the molar mass. This will cause the conversion because the molar mass exists as a ratio; technically, the ratio states that there are 101.96 grams per every 1 mole Al₂O₃. It is important to arrange the ratio in a way that allows for the cancellation of units. In this case, the desired unit (grams) should be in the numerator. The final answer should have 2 sig figs to reflect the given value (2.7 mol).
Molar Mass (Al₂O₃): 101.96 g/mol
2.7 moles Al₂O₃ 101.96 g
------------------------ x ------------------- = 275 g Al₂O₃ = 280 g Al₂O₃
1 mole
Can you find the difference between the following changes? why? a)rolling of chapati from dough b) baking of chapati
Answer:
They have different temperatures.
Explanation:
Answer:
a. when we are rolling the dough it only changes the shape, its a physical change.
b. we cant change the shape once its cooked, its a chemical change
Explanation:
hope it helps
An ice freezer behind a restaurant has a freon leak, releasing 31.68 g of C2H2F3Cl into the air every week. If the leak is not fixed, how many kilograms of fluorine will be released into the air over 6 months
The weight of fluorine released in to the air over 6 month will be 0.365 kg
What is Freon ?
Freon is a non-combustible gas that is used as a refrigerant in air conditioning applications.
This freon undergoes an evaporation process over and over again to help produce cool air that can be circulated throughout your AC system
Total number of weeks = 6 x 4 = 24
Mass leak rate of freon = 31.68 g/week
Mass leak rate of flourine = fluorine mass in freon / molecular mass of freon x leak rate
= 19 x 3 / 118.5 x 31.68
= 15.23 gm/week
Total fluorine leak in 6 month = 15.23 x 24 = 365.72 gm = 0.365 kg
Hence, The weight of fluorine released in to the air over 6 month will be 0.365 kg
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How many grams of
diphosphorus trioxide, P2O3, are
required to react completely with
2.25 moles H₂O?
P2O3 + 3H₂O → 2H3PO3
[?] g P₂03
From the coefficients of the equation, we know that for every 3 moles of water consumed, 1 mole of diphosphorus trioxide is consumed.
This means we need to find the mass of 0.75 moles of diphosphorus trioxide.
The atomic mass of phosphorous is 30.973761998 g/mol.The atomic mass of oxygen is 15.9994 g/mol.So, the formula mass of diphosphorus trioxide is:
2(30.973761998)+3(15.9994)=109.945723996 g/mol.Thus, 0.75 moles have a mass of:
0.75(109.945723996), which is about 82.5 g (to 3 sf)50 atoms, 15 were isotope A, 30 were isotope B, and 5 were isotope C, which isotope would be the most abundant?
The most abundant isotope among the given Isotopes will be Isotope B
How to calculate percentage abundance of isotopes ?To calculate the percent abundance of each isotope in a sample of an element, we usually divide the number of atoms of a particular isotope by the total number of atoms of all isotopes of that element and then multiply the result by 100.
For Isotope A ;% Abundance = 15/50 x 100
= 30 %
For Isotope B ;% Abundance = 30/50 x 100
= 60 %
For Isotope A ;% Abundance = 5/50 x 100
= 10 %
Hence, The most abundant isotope among the given Isotopes will be Isotope B.
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When methane, CH4, is combusted, it produces carbon dioxide, CO₂, according to the unbalanced equation: CH4 +0₂ - CO₂ + H₂O.
Write the balanced equation for this reaction, and explain how it is possible for 10 grams of methane fuel to burn and emit 27 grams of carbon dioxide. Discuss whether or not this reaction obeys the law
of conservation of mass. (5 points)
The balanced equation will be [tex]CH_4 + 2O_2 --- > CO_2 + 2H_2O[/tex]
Stoichiometric problemsThe balanced equation of the reaction would be as follows:
[tex]CH_4 + 2O_2 --- > CO_2 + 2H_2O[/tex]
The mole ratio of methane to carbon dioxide is 1:1.
10 grams of methane will give 10/16 = 0.625 moles
0.625 moles of carbon dioxide would give 0.625 x 44.01 = 27.506 grams.
Thus, 10 grams of methane will produce approximately 27 grams of carbon dioxide stoichiometrically.
The reaction obeys the law of conservation of mass because the atoms of all the elements before and after the reaction are balanced.
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work out the size of resistance.
Answer:
Step 1: Identify the resistivity (ρ) , length (L), and radius (r) of the wire. Step 2: Calculate the cross-sectional area of the wire using the formula for the area of a circle: A=πr2 A = π r 2 . Step 3: Calculate the resistance (R) of the wire using the formula for resistance: R=ρLA R = ρ L A
During the distillation nitrogen gas is obtained first, then argon and oxygen. What can u say about the boiling points of these three gases?
Explanation:
The boiling point of liquid nitrogen, liquid argon, and liquid oxygen are -196°C, -186°C, and -183°C respectively. So, the correct order is nitrogen, argon, oxygen.
Nitrogen:
Since you don't want nitrogen to be condensing everywhere when it gets cold out, elemental nitrogen's boiling point is luckily below zero degrees Celsius. Thank goodness for nitrogen's extremely low boiling point. If it were at zero, boiling water would not produce a lot of heat, necessitating the use of a pressure cooker to prepare foods that typically call for boiling water. Additionally, since the air would be substantially enhanced with oxygen, items may catch fire more quickly (i.e. your home might burst in flame that much more easily). An ugly picture, to be sure.
Argon:
As nonpolar gases, Ar, F2, and Cl2 only display London Dispersion Forces (LDF). These largely negligible forces, which are the product of transient dipoles, must be resisted throughout the boiling process. Since bigger atoms and molecules have valence electrons further from their nucleus, LDF intensity is also directly correlated with atomic or molecular size. Compared to smaller atoms or molecules, these outermost electrons are less attracted to the positive nucleus or nuclei, making it simpler for them to create transient dipoles. As a result, the differing molar masses of each compound—Ar—39.95 g/mol, F—38.00 g/mol, and Cl—70.90 g/mol—can be used to explain the variation in boiling points.
Oxygen:
At 1 atm, oxygen would boil at -183 degrees Celsius if it were a liquid. Although the phase diagram for oxygen is more intricate than this, it is a general phase diagram. Imagine that the term "vaporization" is at the same height as 1 atm, which is roughly halfway up the y-axis. If the y value at that time was equal to 1 atm, the "vaporization" arrow to the right would be directly above -183 degrees Celsius. It's crucial to remember that pressure determines what temperature a substance will boil, melt, condense, or freeze, as you can probably guess. Additionally, the pressure in particular circumstances can affect what phase a material is in.
