Answer:
the sum is Rs 4,200
Explanation:
Given that
3 by 7 of the sum is $1,800
We need to find out the sum
So,
Here we assume the sum be x
So the following equation should be made
3 ÷ 7 × x = 1800
3x = 1800 × 7
x = (1800 × 7) ÷ 3
= Rs 4,200
Hence, the sum is Rs 4,200
The same would be considered and relevant
0. October 1 a year later
5. An observer on the North Pole sees the Moon as shown below. What moon phase will she observe approximately one week later?
O A First quarter
O B. Full Moon
O c. Waning gibbous
OD. New Moon
Activate W
Please help!!!! Best answer will get brainliest.
Answer:
ionic
Explanation:
I don't know if this correct
A ______ in medicine is a form of scientific argumentation in which evidence is used to rule out claims and support the best conclusion.
fill in the blank
Answer: Scientific reasoning
Explanation:
A scientific reasoning can be defined as the justification which connects the evidence with that of the claim and it rules out all those claims that are not supported by any evidence. It explains the fact that how evidence can support a claim and scientifically acceptable conclusion can be drawn. An argument is always based on one or more claims which can either be true or evidentially proved.
PLS HELP ASAP NO LINKS WILL MARK BRAINLIEST IF CORRECT
What is the toxic life of nuclear waste?
10,000 years
100,000 years
100 years
1 million years
Answer:Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure.
Explanation:
In comparison to other toxic industrial waste, nuclear waste is neither exceptionally dangerous nor difficult to manage. It is technically possible to dispose of high-level radioactive waste safely. The toxic life of nuclear waste is 10,000 years. The correct option is B.
Waste is no longer dangerous if radioactive material has adequately decomposed. However, it will take the radioactive material between a few hours and hundreds of millions of years to decay.
Breeder reactors produce plutonium-239, which has a half-life of 24,400 years and is exceedingly hazardous in even minute amounts. Cesium-137 and strontium-190 are low-level radioactive wastes from typical nuclear power facilities.
Thus the correct option is B.
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if irons temp goes from 50c to 75c in a 20g sample how many joules of heat were used
Answer:
224.5J
Explanation:
Using the formula as follows:
Q = m × c × ∆T
Where;
Q = amount of heat (J)
m = mass of substance (g)
c = specific heat capacity.
∆T = change in temperature (°C)
According to this question;
m = 20g
∆T = 75°C - 50°C = 25°C
Q = ?
c of iron = 0.449 J/g°C
Using Q = m × c × ∆T
Q = 20 × 0.449 × 25
Q = 224.5J
Convert 5.0 g H2 to liters at STP
Answer:
2.6 L CO2 at STP
Explanation:
sorry if its wrong!
What is the molarity of an aqueous solution containing 1.5 moles of calcium chloride in 2.75 L of solution? A. 0.004 M B. 0.55 M C. 1.83 M D. 4.13 M
Answer:
B. 0.55 M
Explanation:
Step 1: Given data
Moles of calcium chloride (solute): 1.5 molVolume of solution: 2.75 MStep 2: Calculate the molarity of the aqueous solution
The molarity is a way to express the concentration of a solution. It is equal to the quotient between the moles of solute and the liters of solution.
M = moles of solute / liters of solution
M = 1.5 mol / 2.75 L = 0.55 mol/L = 0.55 M
What does the VSEPR theory predict?
A. Valence electrons will pair up with electrons from another atom.
B. Valence electron pairs are transferred from a central atom to bonding atoms.
C. Valence electron pairs will move as far apart from each other as possible.
D. Valence electrons around a nucleus will pair up whenever possible.
I believe it's (C). Valence electron pairs will move as far apart from each other as possible.
Explanation:
The formal definition that is the basis for VSEPR is as follows:
Pairs of electrons in the valence shell of a central atom of a molecule repel each other and take up positions as far apart as possible.
Can someone give me an example of a synthesis reaction that is NOT a redox reaction? Pls don't send links. Thanks
Well an example is how hydrogen and oxygen react to form water, you could use that. We know that when two nonmetals react more than one product is possible. Sulfur and oxygen react to form sulfur dioxide or sulfur trioxide.
Hope this helps.
Which wave has the highest frequency?
1
2
3
4
no link or i will report
Answer:
4
Explanation:
because number 4 moves continuous
A mixture of He, Ne, and Ar has a pressure of 14.9 atm at 28.0 °C. If the partial pressure of He is 1.43 atm and the partial pressure of Ar is 4.45 atm, what is the partial pressure of Ne?
Answer: The partial pressure of Ne is 9.02 atm.
Explanation:
Given: Total pressure = 14.9 atm
Partial pressure of He = 1.43 atm
Partial pressure of Ar = 4.45 atm
Partial pressure of Ne = ?
According to the Dalton's law of partial pressures the total pressure exerted by the a number of gases in a mixture is equal to the sum of partial pressures of each gas present in the mixture.
Now, for the given mixture the partial pressure of Ne is as follows.
Total pressure = Partial pressure of He + Partial pressure of Ar + Partial pressure of Ne
Substitute the values into above formula as follows.
Total pressure = Partial pressure of He + Partial pressure of Ar + Partial pressure of Ne
14.9 atm = 1.43 atm + 4.45 atm + Partial pressure of Ne
Partial pressure of Ne = 14.9 atm - 5.88 atm
= 9.02 atm
Thus, we can conclude that the partial pressure of Ne is 9.02 atm.
bicarbonato es metal o no?
Answer:
La palabra bicarbonato es un término químico para referirse a una sal ácida del ácido carbónico en combinación con un metal. ... Pero si sólo está sustituido un átomo de hidrógeno por el metal, entonces obtenemos un bicarbonato o carbonato ácido, por ejemplo, bicarbonato sódico: CO3H Na.
Given the general reaction: A+B → C. When 1 mole of A
reacts, 15 kJ of heat energy is released. What happens if 3
moles of A completely reacts?
a5 kJ of heat is released.
b 45 kJ of heat is released.
C 15 kJ of heat is released.
d There is not enough information.
Answer:
B. 45kg
Explanation:
3 x 15= 45
22.5 g of silver nitrate reacts with excess magnesium bromide, determine the mass
of magnesium nitrate that will be produced.
Answer:
9.82 g of Mg(NO₃)₂
Explanation:
Let's determine the reaction:
2AgNO₃ + MgBr₂ → Mg(NO₃)₂ + 2AgBr
2 moles of nitrate silver reacts with MgBr₂ in order to produce 1 mol of magnesium nitrate and silver bromide.
We determine the moles of AgNO₃
22.5 g . 1mol / 169.87g = 0.132 moles
Ratio is 2:1.
2 moles of silver nitrate can produce 1 mol of magnesium nitrate
Then, our 0.132 moles may produce (0.132 . 1)/ 2 = 0.0662 moles
We convert moles to mass:
0.0662 mol . 148.3 g/ mol = 9.82 g
For the reaction CH3COOH→CH3COO– + H+, which statement is true?
CH3COOH is a Brønsted-Lowry base.
CH3COO– is an Arrhenius base.
CH3COOH is a Brønsted-Lowry acid.
CH3COO– is a Lewis base.
Answer:
For the reaction CH3COOH→CH3COO– + H+
Among the given statements which is the correct statement?
CH3COOH is a Brønsted-Lowry base.
CH3COO– is an Arrhenius base.
CH3COOH is a Brønsted-Lowry acid.
CH3COO– is a Lewis base.
Explanation:
Bronsted acid is the proton donor.
Bronsted base is the proton acceptor.
Arrhenius base is the one that releases OH- ions when dissolved in water.
Lewis base is the one that is an electron-pair donor.
In the given reaction,
CH3COOH→CH3COO– + H+
Acetic acid releases a proton.
So, it is a proton donor.
Hence, It is a Bronsted-Lowry acid.
Third option is the correct answer.
.
Determine the temperature of .084 moles of CO2 gas at 790 mmHg
which occupies a volume of 2.1L
Answer:
Explanation:
Molar volume at STP = 22.4L
So 0.084 mole of CO2 at STP has volume of 22.4*0.084 = 1.882L
Combined Gas Law: P1V1/T1 = P2V2/T2
760*1.882/273 = 790*2.1/Temperature
Temperature = 790*2.1*273/760/1.882
= 316.6K
You have three solutions of aqueous Sodium hydroxide. Their concentrations are 0.5M, 1.0M, and 1.5M. Which solution has the weakest concentration?
Answer:
0.5 M has the weakest concentration.
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to remember that the concentration, or molarity, of a solution is given in terms of moles per liters of solution.
In such a way, we can infer that the solution with the weakest concentration is the one with the smallest molarity, that is 0.5 M.
Best regards!
Structure of co2..................................
Answer:
Carbon dioxide (chemical formula CO 2) is an acidic colourless gas with a density about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms.
In CO2, the Carbon atom is in the central position as it is the least electronegative atom in the molecule. Two Oxygen atoms are located on the terminals where both these atoms share electrons and form bonds with the central Carbon atom.
Lewis structure of CO2 given in the attached image:
a sample of sulfur contains sulfur-32, sulfur-33, sulfur-34, and sulfur-36 atoms. why these atoms can have different mass number but they must have the same atomic number?
Answer:
These atoms belong to the same element (sulfur, atomic number [tex]16[/tex].) Hence, the atomic number of each atom would be equal to the atomic number of sulfur: [tex]16\![/tex].
Each of these isotopes contains a different number of neutrons. Hence, the mass number (number of neutrons and protons in the atom) differ.
Explanation:
The atomic number of an atom is the number of protons in the atom.
The mass number of an atom is the number of protons in this atom, plus the number of neutrons in this atom.
The exact element (e.g., sulfur) that an atom belongs to depends on the atomic number of that atom. For example, an atom with atomic number [tex]16[/tex] belongs to sulfur, while an atom with atomic number [tex]18[/tex] belongs to argon.
All four types of atoms in this sample belongs to the element sulfur. The atomic number of sulfur is [tex]16[/tex]. Hence, the atomic number of all four types of atoms must also be [tex]16\![/tex]. Otherwise, these atoms would belong to other elements and won't be named after "sulfur".
Hence, all atoms in this sample would have the same atomic number: [tex]16[/tex]. Each of these atoms would contain [tex]16\![/tex] protons.
While the number of protons in each of these atoms is fixed, the number of neutrons in each of these atoms could still vary. Because the mass number of an atom accounts for both protons and neutrons, the mass number of these atoms would not be the same.
For example, sulfur-[tex]32[/tex] (mass number [tex]32\![/tex]) contains [tex]32 - 16 = 16[/tex] neutrons, whereas sulfur-[tex]33[/tex] (mass number [tex]33\![/tex]) contains [tex]33 - 16 = 17[/tex] neutrons. (The [tex]16[/tex] in the left-hand side is the number of protons in each of these atoms.) Hence, these types of atoms have different mass numbers even though they share the same proton number.
If you diluted 120 mL of 1,049 M NaCl to 1,920 mL, what would
be the new concentration of NaCl? Don't put units into your
answer.
Answer:
65.56 M
Explanation:
Using the formula as follows:
C1V1 = C2V2
Where;
C1 = initial concentration (M)
C2 = final concentration (M)
V1 = initial volume (L)
V2 = final volume (L)
According to the information in this question,
C1 = 1,049 M
C2 = ?
V1 = 120 mL
V2 = 1,920 mL
Using C1V1 = C2V2
1049 × 120 = C2 × 1920
125880 = 1920C2
C2 = 125880 ÷ 1920
C2 = 65.56 M
how long ago did the Atlantic Ocean separate Canada from Ireland....plz answer I have no idea lol
Answer:
Around 150 million years ago
Explanation:
The Atlantic ocean was formed during the Jurassic period
Answer:
200 millon years ago
Explanation: please give me brainliest
Please help me with science
Answer:
The correct answer is A, Humid Subtropical
Explanation:
Humid Subtropical's climate is wet, warm, and located on the edges of tropics.
How much 0.05 M HCl solution can be made by diluting 2L of 10 M HCl?
Answer:
400 L
Explanation:
As this problem deals with a dilution process, we can use the following formula:
C₁V₁=C₂V₂Where subscript 1 stands for the concentrated concentration and volume, while 2 stands for the diluted values. Meaning that in this case:
C₁ = 10 MV₁ = 2 LC₂ = 0.05 MV₂ = ?We input the data:
10 M * 2 L = 0.05 M * V₂And solve for V₂:
V₂ = 400 L2 Na + Cl ---> 2NaCl
how many grams of NaCl can be produced if 33 grams of Na reacts with excess Cl2 and STP?
a. 170 g
b. 120 g
c. 84 g
d. 72 g
If 65 grams is ACTUALLY produced, what is the percent yield of NaCl in the above problem?
a. 54.2%
b. 38.2%
c. 77.4%
d. 90.3%
Answer:
1. d. 84g
2. c. 77.4%
Explanation:
1. Based on the reaction 2 moles of Na produce 2 moles of NaCl.
The moles of Na (22.99g/mol) in 33g are:
33g * (1mol / 22.99g) = 1.435 moles Na = 1.435 moles NaCl must be produced.
The mass of NaCl is (Molar mass: 58.44g/mol):
1.435moles * (58.44g / mol) = 84g
d. 84g
2. Percent yield is defined as 100 times the ratio between actual yield (65g) and theoretical yield (84g). The percent yield is:
65g / 84g * 100 =
c. 77.4%
In the heating curve of an unknown substance, the line labeled C represents what change(s)?
A) Temperature
B) Kinetic Energy
C) Temperature and Kinetic Energy
D) Temperature and Potential Energy
Answer:
C) Temperature and Kinetic Energy.
Explanation:
Hello there!
In this case, according to the generic heating curve on the attached file, it possible to see that on the point C, whereas the line is diagonal, the temperature increases, but also the kinetic energy increases because the molecules gain energy due to the increase of the temperature. It is important to say that on flat lines, like those on B and D, the phase change takes place and just the potential energy change.
In such a way, we infer that the answer is C) Temperature and Kinetic Energy.
Best regards!
Answer:
C) Temperature and Kinetic Energy.
Explanation:
In the heating curve of an unknown substance, the line labeled C represents Temperature and Kinetic Energy.
Which component is reduced during the electrolysis of brine?
A. sodium ions
B. chloride ions
C. water
D. sodium hydroxide
Answer:
During the electrolysis, hydrogen and chloride ions are removed from solution whereas sodium and hydroxide ions are left behind in solution. This means that sodium hydroxide is also formed during the electrolysis of sodium chloride solution.
Answer:
water....
Explanation:
gradpoint
Cyclohexane (C6H12) is one of the components of crude oil. Which shows the
balanced combustion reaction for cyclohexane?
Answer:
D. C6H12+9O2 -> 6CO2+6H2O+heat
Explanation:
got it right on ap ex
The combustion reaction is the reaction between reactants and oxygen. The balanced combustion reaction for cyclohexane is, C₆H₁₂ + 9O₂ → 6CO₂ + 6H₂O + heat. Thus, option D is correct.
What is a combustion reaction?A type of reaction that includes the release of energy and heat when the oxygen reacts chemically with the reactant. The presence of oxygen as one of the reactants is a characteristic property of the combustion reaction.
As a result of the reaction carbon dioxide and water is produced along with heat in the reaction. The balanced combustion reaction of cyclohexane (C₆H₁₂) is given as,
C₆H₁₂ + 9O₂ → 6CO₂ + 6H₂O + heat
Here, the number of carbon is six on both sides, twelve hydrogen on both sides, and eighteen oxygen on the left and right sides of the reaction.
Therefore, option D. C₆H₁₂ + 9O₂ → 6CO₂ + 6H₂O + heat is the balanced combustion reaction.
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A 1.0 mol sample of which of the following compounds has the greatest mass?
A) NO
B) NO2
C) N2O
D) N2O5
Answer:
D) N2O5
Explanation:
The molar mass of a substance is defined as the mass of this substance in 1 mol. To solve this question we must find the molar mass of each option:
Molar mass NO:
1N = 14g/mol*1
1O = 16g/mol*1
14+16 = 30g/mol
Molar mass NO2:
1N = 14g/mol*1
2O = 16g/mol*2
14+32 = 46g/mol
Molar mass N2O:
2N = 14g/mol*2
1O = 16g/mol*1
28+16 = 44g/mol
Molar mass N2O5:
2N = 14g/mol*2
5O = 16g/mol*5
28+80 = 108g/mol
That means the compound with the greatest mass is:
D) N2O5How many moles are in 45.8 g of calcium nitrate, Ca(NO3)2? PLEASE HELP
Answer:
the number of moles is 0.279
Explanation:
The computation of the number of moles of calcium nitrate, is shown below;
We know that
Number of moles = mass of substance ÷ molecular weight
= 45.8 g ÷ 164.088
= 0.279moles
hence, the number of moles is 0.279
We simply applied the above formula so that the correct value could come
An element is shiny, conducts heat and electricity, and has 2 valence electrons. Which element could this be?
a.Na
b.Fe
c.O
d.Ca