Answer:
S 2.6 [2.58] & C is 2.6 [2.55]
Explanation:
8
Atomic #?
Atomic mass?
# of neutrons?
O
Oxygen
15.999
Answer:
eight because I think it's eight
Which staternent about all the noble gases is correct?
A The number of protons in the atoms equals the number of neutrons.
B Their atoms each have a stable arrangement of electrons.
C Their atoms each have eight electrons in their outer shell
D They exist as molecules containing two atoms.
Answer:
B
Explanation:
The electrons in all noble gases are filled with electrons and don't need to involve in a reaction to gain or loss
The answer A is wrong because not all of them has same number of protons equal the neutrons
Answer C is wrong because we can see helium with 2 electrons in outer shell
and Answer D is wrong as we say above each atom doesn't need to react with another to be stable
When 55.8 g of Fe reacts with Cl2 according to the equation 2Fe + 3Cl2 --> 2FeCl3. How many moles of Cl2 are required to react with all the iron?
2.00 mol
1.00 mol
0.67 mol
1.50 mol
Answer:
1.50 moles
Balanced equation: 2Fe + 3Cl₂ --> 2FeCl₃
find moles of iron:
moles = mass/Mr
moles = 55.8/56
moles = 0.9964 moles
use molar ratio:
2Fe : 3Cl₂
2 : 3
moles of Cl₂ = (0.9964/2)*3 = 1.50 moles
A 60-g sample of radioactive isotope is measured after two half-lives have passed. What pair of percentages describes the sample after two half-lives?.
Answer:
25% is left 15 gm
Explanation:
(1/2)^2 = 25%
Answer:
b. 25% unchanged and 75% stable
Explanation:
got it right on edge
What chemical property determines the strength of an acid?.
Can you dissolve. 35 moles of potassium permanganate (kmno4) into 500 ml of water? _________ why? / why not?
Yes, we can dissolve 35 moles of KMnO₄ into 500 mL of water to give a molarity of 70 M
What is molarity?Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the molarity Mole of KMnO₄ = 35 moles Volume = 500 mL = 500 / 1000 = 0.5 L Molarity =?Molarity = mole / Volume
Molarity = 35 / 0.5
Molarity = 70 M
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We can not dissolve 35 moles of potassium permanganate into 500 ml of water as it produces the solution with higher molarity than water have.
What is molarity?Molarity of any solution is define as the number of moles of solute present in per liter of the solvent as:
M = n/V
The molarity of the solvent, water, is the highest for aqueous solutions and molarity of 1000g of pure water in 1 liter is 55.5M
Given that,
n = moles of potassium permanganate = 35 molesV = Volume = 500 mL = 500 / 1000 = 0.5 LOn putting values, we get
M = 35/0.5 = 70M
Preparation of this solution is impossible.
Hence, KMnO₄ will not dissolve in the water as it produces solution with higher molarity than water.
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Round the mmHg readings to the nearest whole number. Round the kPa readings to the nearest tenth. Round the atm readings to the nearest hundredth. Convert a pressure of 2.76324 kPa to _____ torr
Given the pressure in KPa, the value of the pressure reading in torr obtained is 20.73 torr
Conversion scale101.325 KPa = 760 torr
Data obtained from the question Pressure (KPa) = 2.76324 KPa Pressure (torr) =? How to determine the pressure in torrThe value of the pressure in torr can be obtained as illustrated below:
101.325 KPa = 760 torr
Therefore,
2.76324 KPa = (2.76324 × 760) / 101.325
2.76324 KPa = 20.73 torr
Thus, 2.76324 KPa is equivalent to 20.73 torr
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which diver will experience more pressure: A scuba diver at 10 meters or one at 100 meters below at the surface of the water
Answer:
The one 100 meters below the surface of the water.
Explanation:
As you go deeper into a body of water, there is more water above, and therefore a greater weight pushing you down.
3. What is the hydrogen ion concentration of a solution with a pH of 2.0?
Answer:
[H+] = 10^-2
Explanation:
pH = -log[H+]
2 = -log[H+]
[H+] = 10^-2
The molar mass of sucrose (c12h22o11) is 342.3 g/mol. a chemist has a 0.500-mol sample of sucrose. what is the mass, in grams, of this sample? 171 grams 342 grams 500 grams 684 grams
Mass is the measure of the quantity of the substance present in the sample containing a compound or molecule. The mass of sucrose in the sample is 171 g.
What is mass?The mass of the compound in the sample is the product of the number of moles of the substance and the molar mass of the compound.
Given,
The molar mass of the sucrose compound = 342.3 g/mol
Number of moles of sucrose = 0.500 moles
Mass of sucrose is calculated as:
[tex]\begin{aligned}\rm mass &= \rm moles \times molar \; mass\\\\&= 0.500 \;\rm moles \times 342.3 \;\rm g/mol\\\\&= 171.15 \;\rm gm\end{aligned}[/tex]
Therefore, option A. 171 gm is the mass of sucrose.
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The correct answer is option A: 171 grams
Explanation: Got 90% on the quiz on edge and got this answer right
Why do different elements produce distinct colors in the flame test
Answer:
Their electrons have different allowed energy levels
Explanation:
Elements are the pure form that only consists of the atoms of the same proton number. Distinct colors are produced in the flame test as their electrons have different energy levels.
What is the Flame test?A flame test is a procedure that detects the presence of chemical substances based on a spectrum and colors emitted by the elements in the flame.
The energy levels of the different elements vary and are defined by the movement of the electrons in the spectra. The energy released and the flame produced by different electrons are different.
Therefore, electrons with various energy levels release flames of different colors.
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Using standard thermodynamic data at 298k, calculate the free energy change when 2. 34 moles of nh3(g) react at standard conditions
For a thermodynamic data at 298k, when 2. 34 moles of nh3(g) react at standard conditions, the free energy change is mathematically given as
dG'−213.174KJ
What is the free energy change?Generally, the equation for the Chemical Reaction is mathematically given as
HCL+NH3----->NH4Cl
Therefore
dG=-202.9-[-16.5+(95.3)]
dG=-91.1KJ/mol
In conclusion, For 2.34 moles
dG'=-91.1KJ/mol*2.34
dG'−213.174KJ
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The free energy change when 2.34 moles of NH₃(g) react at standard conditions is -213.174 kJ.
How do we calculate free energy change?Free energy change of any chemical reaction will be calculated by using the following chemical reaction:
ΔG = Free energy of products - Free energy of reactants
Given chemical reaction is:
NH₃ + HCl → NH₄Cl
From the stoichiometry of the reaction it is clear that same moles of ammonium chloride is produced by the same moles of ammonia & hydrochloric acid.
Free enrgy of NH₄Cl = -202.9 kJ/mol
Free enrgy of NH₃ = -16.5 kJ/mol
Free enrgy of HCl = 95.3 kJ/mol
On putting values in the above equation, we get
ΔG = -202.9-[-16.5+(95.3)]
ΔG = -91.1KJ/mol
For 2.34 moles, ΔG will be:
ΔG = (2.34)(-91.1) = -213.174 kJ
Hence required amount of free eenrgy is -213.174 kJ.
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Can somebody please help write a short paragraph about this including all the words listed in the question. Thanks!
WILL MARK BRAINLIEST WHOEVER CAN ANSWER FIRST!!! :DDDD
Answer:
Vaccines work by stimulating your immune system to produce antibodies, exactly like it would if you were exposed to the disease. After getting vaccinated, you develop immunity to that disease, without having to get the disease first.
In what container can you not see the meniscus
Answer:
Measure so that the line you are reading is even with the center of the meniscus. For water and most liquids, this is the bottom of the meniscus. For mercury, take the measurement from the top of the meniscus. In either case, you are measuring based on the center of the meniscus.
Explanation:
Which process can be used to power a home? solar thermal energy neither solar thermal energy nor solar electric energy both solar thermal energy and solar electric energy solar electric energyWhich process can be used to power a home? solar thermal energy neither solar thermal energy nor solar electric energy both solar thermal energy and solar electric energy solar electric energy
Answer:
solar electric energy
Explanation:
k12
The chemical equation below shows the decomposition of nitrogen triiodide (NI3) into nitrogen (N2) and iodine (I2). 2NI3 Right arrow. N2 3I2 The molar mass of NI3 is 394. 71 g/mol. How many moles of I2 will form 3. 58 g of NI3? 0. 00907 moles 0. 00940 moles 0. 0136 moles 0. 0212 moles.
The moles of I₂ will form from the decomposition of 3.58g of NI₃ is 0.0136 moles.
How we calculate moles?Moles of any substance will be calculated as:
n = W/M, where
W = required mass
M = molar mass
Given chemical reaction is:
2NI₃ → N₂ + 3I₂
Moles of 3.58g of NI₃ will be calculated as:
n = 3.58g / 394. 71 g/mol = 0.009 moles
From the stoichiometry of the solution, it is clear that:
2 moles of NI₃ = produce 3 moles of I₂
0.009 moles of NI₃ = produce 3/2×0.009=0.0136 moles of I₂
Hence, option (3) is correct i.e. 0.0136 moles.
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Calculate the number of moles when 3.00l of a gas at 814 mmhg and 25 °c?
So
No of moles=n
[tex]\\ \rm\rightarrowtail PV=nRT[/tex]
[tex]\\ \rm\rightarrowtail n=\dfrac{PV}{RT}[/tex]
[tex]\\ \rm\rightarrowtail n=\dfrac{814(3)}{25R}[/tex]
[tex]\\ \rm\rightarrowtail n=2442/25R[/tex]
[tex]\\ \rm\rightarrowtail n=97.7Rmol[/tex]
How many Oxygen atoms are there in 2MgSO4?
Answer:
8
Explanation:
2MgSO4
We see there are 4 atoms, but these are multiplied by 2, therefore 8 atoms of oxygen.
Answer:
it is 4.
Explanation:
four atoms of oxygen (O)
four atoms of silicon (Si)
two atoms of magnesium (Mg)
two atoms of oxygen (O)
How do mechanical and chemical weathering relate to the formation of soil?
Answer:
Mechanical weathering breaks rocks into smaller pieces without changing their composition. … Chemical weathering breaks down rocks by forming new minerals that are stable at the Earth's surface. Water, carbon dioxide, and oxygen are important agents of chemical weathering.
Explanation:
brainlist me pls and I'm right, correct me if I'm wrong
Answer:
Mechanical weathering reduces the size of rocks without altering their content.
Chemical weathering damages rocks by creating new materials that are stable on earth's surface.
which five atoms tend to form double of triple bonds? explain why these atoms form double and triple bonds.
Answer:
The formation of double and triple bonds is not as widespread among the atoms of the periodic table as one might expect. At least one of the atoms involved in a multiple bond is almost always C, N, or O, and in most cases both atoms are members of this trio
Covalent bonding occurs when electrons are shared between atoms. Double and triple covalent bonds occur when four or six electrons are shared between two atoms, and they are indicated in Lewis structures by drawing two or three lines connecting one atom to another.
Explanation:
What will your grade be if you have an 80 and you got a 68 on your unit test
Answer:
Its would be a very low C or a high D
Explanation:
Depending on what your teacher says or if you only got part of a question wrong it would be a very low C or a high D.
How many moles are in 79.85 g of Iron (III) oxide?
Answer:
For Fe, it's 55.845 g/mol. So 7.85 / 55.845 = 0.141 mol.
What property did mendeleev use to organize the periodic table.
Answer:
Atomic weight.
Explanation:
Hope this helps you!
How is a double displacement reaction completed and balanced
A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds. Many double displacement reactions occur between ionic compounds that are dissolved in water. A double replacement reaction is represented by the general equation.
What does that mean about the densities of the phases of water?.
Answer:
The solid state is the most dense, followed by the liquid state, then the gas state. The solid state is more dense than the liquid state.
Explanation:
Does this answer your question???
Need help ASAP. Thank you
Answer:
Circuit 1 = ?
Circuit 2 = Parallel
Explanation:
Since circuit 1 isn't shown on the picture, it's probably a series circuit, but if circuit 1 is a box with symbols around it, then it's a series circuit. But if it has three or more horizontal lines/cables like circuit 2, then it's a parallel circuit - circuit 2 has a second horizontal line with an open switch and lamp.
Circuit 2 is a parallel circuit, as it has branches/horizontal lines (that were explained in the paragraph above).
Draw the structure of the major nitration product from the reaction of nitric acid with 1,3‑dimethylbenzene. Show all formal charges
The 2,4 and 5 positions are accessible for nitration of 1,3‑dimethylbenzene. The final product is shown in the image attached.
What is nitration?Nitration is a type of reaction in which the nitro group (-NO2) is introduced to an aromatic ring. We have to note that in the compound 1,3‑dimethylbenzene, the 2,4 and 5 positions are accessible for nitration as shown.
Hence, the nitration of 1,3‑dimethylbenzene occurs as shown in the image attached with the compound shown being the major product.
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The structure of the major nitration product from the reaction of nitric acid with 1,3‑dimethylbenzene is shown in attached image.
What is nitration?Nitration is a process in which addition of nitro group (-NO₂) is taking place on the substrate molecule.
In the given question 1,3‑dimethylbenzene is the susbtarte in which nitration will be done in the presence of sulphuric acid (H₂SO₄) and nitric acid (HNO₃). Methyl groups which are present in the substrate molecule will behave as an ortho para directing groups as they are electron donating groups. So the major product obtained in the reaction is shown below in image.
Hence the structure of major nitration product is shown below in image.
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Scientific laws commonly answer which questions about the world?
1. Why?
2. How?
3. How many?
4. What?
Answer:
How
Explanation: In science a person has to be curious on how things work. Key word how. Why makes sense but how is the better answer. How many is a specific question. But it doesn't involve the whole spectrum of science. What also doesn't make sense.
A scientific law is a proposition that states what consistently takes place under specific circumstances. The law of conservation of mass and the law of conservation of energy are two other examples of physical science laws. The correct option is 2.
A scientific law only describes an occurrence in the natural world; it makes no attempt to explain how it happens. It is only the outcome of several observations and is supported by empirical evidence.
The definition of a naturally occurring phenomenon in the world is scientific law. It clarifies how something occurs. Equations or formulas in mathematics are used to express laws.
Thus the correct option is 2.
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Why agar is used as a solidifying agent in culture media instead of gelatin
Agar is used as a solidifying agent in culture media instead of gelatin because it readily melts and it contains no nutrition for bacteria cultures.
What is agar?Agar is a gelatinous material obtained from red algae and used in the preparation of culture medium.
Agar is used to solidify the culture medium for bacteria growth, although, gelatin can also be used.
However, agar is preferred as a solidifying agent in culture media instead of gelatin because it readily melts and it contains no nutrition for bacteria cultures.
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Consider the two triangles shown below.
Note: The triangles are not drawn to scale.
Triangles may be regarded as similar or congruent on the following basis;
1) Side angle side (SAS)
2) Side side side (SSS)
3) Angle Angle side (AAS)
What is a triangle?A triangle is a three sided figure. The figures are not shown here. However, two triangle may be regarded as similar or congruent by the following conditions;
1) Side angle side (SAS)
2) Side side side (SSS)
3) Angle Angle side (AAS)
Since the triagles are not shown here, the similarity of the triangles can not be established.
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