412.056524g is present in 2.3×10^24atoms of Ag
Which of the following statements about ions is NOT CORRECT?
A. Anions are negative ions.
B. Anions are formed when an atom loses electrons.
C. Neutral atoms always have the same number of protons as electrons.
D. Cations are positive ions.
Answer:
B. Anions are formed when an atom loses electrons.
The statement about ions that is not correct would be B. Anions are formed when an atom loses electrons.
Why is this false ?Anions are formed when an atom gains electrons. This means that they have more electrons than protons, giving them a negative charge. Cations are formed when an atom loses electrons. This means that they have fewer electrons than protons, giving them a positive charge.
The other statements are correct. Neutral atoms always have the same number of protons as electrons. This means that they are electrically neutral. Cations are positive ions, and anions are negative ions.
In conclusion, option B is correct.
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True or False
1. Magma with a high silica content will be less viscous, therefore be more fluid.
2. An increase of one on the Richter scale corresponds to a tenfold increase in the amplitude of body wave
3. Magma is found on the surface, lava is beneath the surface.
Answer:
Explanation:
1.false
2.true
2.true
Magma that contains high silica content will have higher viscosity. This is because they exhibit greater rate of polymerization unlike magma with less silica content
Therefore the number 1 statement is false.
A Richter scale is a device that is used to calculate an earthquakes size from the amplitude of the largest wave recorded by a seismograph.
One unit on the scale represents a 10-fold increase in the magnitude of an earthquake.
Therefore the number 2 statement is true.
Magma is a liquid rock found under the earth which can find its way to the surface of the earth through cracks and holes.
When magma finds its way to the surface of the earth it is called lava.
Therefore statement 3 is false.
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How many electrons are in the outermost shell of the K+ ion in its ground state?
Answer:
If we look at the electron configuration of potassium (K), we see that it has one electron: [Ar]4s1. Obviously, removing that electron gives us [Ar] (same configuration as K1+), which is a noble gas and has 8 electrons. Valence electrons are generally regarded as being 'the outermost electrons' for a given atom
Calculate the number of C atoms in 0.716 mole of C?
Answer:
The answer is 4.31 × 10²³ C atoms
Explanation:
The number of C atoms can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 0.716 × 6.02 × 10²³
We have the final answer as
4.31 × 10²³ C atomsHope this helps you
All of the following are true about Vertical Migration, EXCEPT:
o Organisms descend back down to the Mesopelagic Zone at dawn to avoid predators.
o Organisms prevent the removal of atmospheric carbon
o Organisms vertically migrate 200-700 meters on average.
O Organisms vertically migrate under the cover of dusk to avoid predators.
Answer:
B
Explanation:
All are moving vertically but b is speaking about how they remove atmospheric carbon
Which property of a sound wave increases as the pitch of the sound
increases?
A. Amplitude
B. Wavelength
C. Rest position
ОО
D. Frequency
Answer:
the answer is d. frequency
The enthalpy change of reaction 1 is -114 kJ mol-1
reaction 1
2NaOH(aq) + H2SO4(aq)
→ Na2SO4(aq) + 2H2O(1)
By using this information, what is the most likely value for the enthalpy change of reaction 2?
reaction 2
Ba(OH)2(aq) + 2HCl(aq) → BaCl2(aq) + 2H2O(1)
Answer:
-114kJ mol-1
Explanation:
Definition of the enthalpy change of neutralization: the energy released with the formation of 1 mole of water when neutralization takes place between an acid and a base.
Since both reactions yield the same number of moles of water, the answer should be -114kJ mol-1.
The statement for the enthalpy change of reaction 2 is "-114 kJ"
What is enthalpy change?The change in enthalpy (ΔH) is a quantity of heat of a system. The enthalpy change is the amount of heat that enters or exits a system during a reaction.
One equivalent of hydrogen ions is neutralised with one equivalent of hydroxide ions in the reaction 1,
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
The change in enthalpy is given as -114 kJ.
Two equivalents of hydrogen ions are neutralised with two equivalents of hydroxide ions in the reaction 2,
Ba(OH)2 + H2SO4 (aq) → BaSO4 (s) + 2H2O (l)
But, that primary ionic reaction is same for both the reaction in which hydrogen ion combines with hydroxide ion to generate a water molecule. So, the enthalpy change of reaction 1 would be exactly same as for reaction 2.
The neutralization enthalpy comes out to be -114 kJ.
Hence the correct answer is -114 kJ.
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A gas expands from 285 mL to 789 mL at constant temperature. How much work is done by the gas (joules) if it expands against a constant pressure of 6.00 atm?
Answer:
-306j
Explanation:
For this question we define an equation:
W = -Pext(Vj-Vi)-----> eqn 1
P = 6atm
Vi = 285 ml
We convert it to litre
= 285/1000 mL
= 0.285 L
Vj = 789 mL
When converted to litre
= 789/1000 mL
= 0.789 L
These values are all going to be put values in the eqn 2 above
W = -Pext(Vj-Vi)
W = -6.0x (0.789L - 0.285L)
W = -3.024
W = -3.024 x 101.33 J
This gives us the answer
W = -306 J
Thank you!
Answer: -306 J
2. Suppose 13.7 g of C2H2 reacts with 18.5 g O2 according to the reaction below. C2H2(g) + O2(g) → CO2(g) + H2O(ℓ) a. What is the mass of CO2 produced? b. What is the limiting reagent?
Answer:
Mass of CO₂ produced = 20.328 g
Oxygen is limiting reagent.
Explanation:
Given data:
Mass of C₂H₂ = 13.7 g
Mass of O₂ = 18.5 g
Mass of CO₂ produced = ?
What is limiting reagent = ?
Solution:
Chemical equation:
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
Number of moles of C₂H₂:
Number of moles = mass /molar mass
Number of moles = 13.7 g/ 26.04 g/mol
Number of moles = 0.526 mol
Number of moles of O₂:
Number of moles = mass /molar mass
Number of moles = 18.5 g/ 32 g/mol
Number of moles = 0.578 mol
Now we will compare the moles of CO₂ with C₂H₂ and O₂
C₂H₂ : CO₂
2 : 4
0.526 : 4/2×0.526 = 1.052
O₂ : CO₂
5 : 4
0.578 : 4/5×0.578 = 0.462
The number of moles of CO₂ produced by O₂ are less thus oxygen will be limiting reactant.
Mass of CO₂ produced:
Mass = number of moles × molar mass
Mass = 0.462 mol × 44 g/mol
Mass = 20.328 g
Element X consist of two isotopes with masses of 62.9 and 64.9. The relative atomic mass of the element is 63.6. What is th
e percentage abundance of the lighter isotope? Show your working out.
Answer:
it is 50%
Explanation:
62.9x50=3145
64.9x50=3245
3245+3145=6390
6390/100=63.9
the illustration shows how sonar can be used to study the deep ocean which type of waves does sonar use
Answer:
d
Explanation:
Which of these is a compound
A) O
B)CO2
C)O2
D)Co
Answer:B. CO2
Explanation: It is B because it has both letters capitalized if it is a compound and it only has 1 letter capitalized if it is an element.
If a sample containing 18.1 g of NH3 is reacted with 90.4 g of
Cuo, which is the limiting reactant? How many grams of N2
will be formed?
Answer:
3.64g
Explanation:
Given parameters:
Mass of NH₃ = 18.1g
Mass of Cu₂O = 90.4g
Unknown:
Limiting reactant = ?
Mass of N₂ formed = ?
Solution:
The reaction equation is given as:
Cu₂O + 2NH₃ → 6Cu + N₂ + 3H₂O
The limiting reactant is the one in short supply in the reaction. Let us find the number of moles of the given species;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Cu₂O = 2(63.6) + 16 = 143.2g/mol
Molar mass of NH₃ = 14 + 3(1) = 17g/mol
Number of moles of Cu₂O = [tex]\frac{18.1}{143.2}[/tex] = 0.13moles
Number of moles of NH₃ = [tex]\frac{90.4}{17}[/tex] = 5.32moles
From this reaction;
1 mole of Cu₂O combines with 2 mole of NH₃
So 0.13moles of Cu₂O will combine with 0.13 x 2 mole of NH₃
= 0.26moles of NH₃
Therefore, Cu₂O is the limiting reactant. Ammonia is in excess;
Mass of N₂;
Mass = number of moles x molar mass
1 mole of Cu₂O will produce 1 mole of N₂
0.13 mole of Cu₂O will produce 0.13 mole of N₂
Mass = 0.13 x (2 x 14) = 3.64g
A sample of gas is placed into an enclosed cylinder and fitted with a movable piston. Calculate the work (in joules) done by the gas if it expands from 4.22 L to 15.61 L against a pressure of 5.63 atm.
Answer:
The work is -6,497.54 J
Explanation:
Work is the amount of energy transferred from one system to another by a force when a displacement occurs.
The work exchanged for a gas depends on the transformation it performs to go from the initial state to the final state.
The pressure - volume work done by a system that compresses or expands at constant pressure is given by the expression:
W= -P*ΔV
where
W is the work exchanged by the system with the environment. Its unit of measure in the International System is the joule (J), which is equivalent to Pa*m³P: Pressure. Its unit of measurement in the International System is the pascal (Pa). ∆V: Volume variation (∆V = Vfinal - Vinitial). Its unit of measurement in the International System is cubic meter (m³)In this case:
Wsystem=?P= 5.63 atm=570,459.8 Pa (being 1 atm=101325 Pa)ΔV=Vfinal - Vinitial= 15.61 L - 4.22 L= 11.39 L= 0.01139 m³ (being 1 L=0.001 m³)Replacing:
W= -570,459.8 Pa*0.01139 m³
Solving:
W=-6,497.54 J
The work is -6,497.54 J
Is mass conserved when 40 g of sodium hydroxide undergoes a chemical change during an interaction with 37g of hydrogen chloride? Use complete sentences to support your answer by explaining how this can be demonstrated. (10 points)
Answer:
Mass is conserverd
Explanation:
Any chemical reaction must follow the law of conservation of mass. Meaning that mass cannot be created nor destroyed. Since all chemical reactions must follow this law, no matter what reaction happens, mass is conserved.
i need help ):
soo.. help me ! please (:
Answer:
23 Sandwiches
6 slices of bread
0 slices of cheese
Explanation:
brainliest pls:)
Which describes a speed?
O A. Moving 8 meters in 2 seconds
O B. Falling down at 100 miles/hr
O C. Moving north at 40 km/hr
O D. Speed changing from 2 km/hr to 5 km/hr
5. How many moles of aluminum sulfate would contain 3.54 x 1025 sulfur atoms?
Answer:
19.6 moles of aluminum sulfate
Explanation:
Given parameters:
Number of sulfur atoms = 3.54 x 10²⁵ atoms
Unknown:
Number of moles of aluminum sulfate = ?
Solution:
Aluminum sulfate is expressed as;
Al₂(SO₄)₃
1 mole of Aluminum sulfate contains 3 moles of sulfur.
6.02 x 10²³ atoms are found in 1 mole of any substance;
3.54 x 10²⁵ sulfur atoms will be found in [tex]\frac{3.54 x 10^{25} }{6.02 x 10^{23} }[/tex] = 58.8moles of sulfur
1 mole of Aluminum sulfate contains 3 moles of sulfur.
or ;
3 moles of sulfur is contained in 1 mole of aluminum sulfate
58.8moles of sulfur will contain [tex]\frac{58.8}{3}[/tex] moles of aluminum sulfate
= 19.6 moles of aluminum sulfate
An object with a mass of 6.3 kg has a force of 7.1 newtons applied to it. What is the resulting acceleration of the object?
Answer:
thank you for asking question
Answer:
correct the answer below is correct !!
Explanation:
how many elements are present No and NO
The density of a substance is 1.63 grams per milliliter. What is the volume, in ml, of a sample of the substance with a mass of 5.40Kg? 1000 g = 1 kg
Answer:
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Explanation:
What happens to the stability of atoms when they form covalent bonds?
Answer
The two types of chemical bonds that atoms can form to achieve stability are called ionic bonds and covalent bonds. In ionic bonds, atoms donate or receive electrons to achieve stability. In covalent bonds, atoms share electrons to achieve stability.
Dominant alleles uses
A.
Lower case alleles
B.
upper case alleles
C.
Upper and lower case alleles
D.
It doesn’t matter
Answer: Upper Case Alleles
Explanation: Lower case alleles are recessive
This chemical equation represents a chemical reaction.
HCl + NaOH - NaCl + H20
Which two chemicals are products in the chemical reaction?
A. NaOH
B. H20
C. NaCl
D. HCI
Explanation:
products are Nacl + H20
Based on the Lewis/electron dot representation
of the two atoms, predict the ratio of metal
cationic (+) atom to nonmetal anionic (-) atom in
the compound.
.Ca.
.P.
A. 1:1
B. 3:2
C. 2:1
D. 3:1
b. Elements in the same period have what in common? (Look at the table)
Answer:
Elements in the same period have the same number of valence electrons as each other.
Which statement best explains how organ systems work together to remove wastes?
D is your answer correct.
The circulatory system carries carbon dioxide away from cells and respiratory system removes from the body. The correct option is D.
What is organ system?A group of organs that cooperate to carry out one or more functions is known as an organ system in biology. Each organ in a plant or animal body is composed of certain tissues and serves a specific purpose.
They can aid in gas exchange, waste removal, nutrient acquisition and transportation, illness sensing, and disease protection for the body.
The superior vena cava and the inferior vena cava are two significant veins that carry oxygen-poor, carbon dioxide-rich blood back to the right side of the heart.
The blood is then transported to the lungs via the pulmonary artery, where it absorbs oxygen and exhales carbon dioxide.
Thus, the correct option is D.
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Select the best answer for the question.
16. Stoichiometry is the study of chemical reactions that BLANK
the particles.
Answer:
the answer is seperate
Explanation:
Stoichiometry is the study of chemical reactions that to calculate the number of mole that are used in the reactant and product of the particles.
What is Stoichiometry?Stoichiometry is the system of chemistry which is responsible to keep the data or information about the amount of reactant and the products which are taking part in a chemical reaction.
Balancing of any chemical equation is the main part of it by comparing the atom used as reactant and the number of atom used as a product. basically it signifies the relationship between the reactant and product.
It is only the quantitative analysis of the reaction not the qualitative one.
Therefore, stoichiometry is the study of chemical reactions that to calculate the number of mole that are used in the reactant and product of the particles.
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How many chlorine atoms are there in 2 molecules of ICl?
Answer: 38 chlorine atoms are in 3 molecules of HCI
Explanation:
Naming inconic compounds and lots of iconic naming
if you just look up the answer it comes up btw!!
have a great day
