Answer:
Moles = mass(m) / Molar mass (M)
A. 1.24g of Zn
m = 1.24g
M = 65.4 g/mol
moles of Zn = 1.24g/ 65.4g/mol
= 0.01896mol
B. 28.1 g Ar
m = 28.1g
M(Ar) = 39.9g/mol
moles of Ar = 28.1g/39.9g/mol
= 0.7043 mol
C. 84.0 g Ta
m = 84.0g
M(Ta) = 181g/mol
moles of Ta = 84.0g/181g/mol
= 0.4641 mol
D. 2.29x10^-2 g Li
m = 2.29x10^-2 g
M(Li) = 6.9g/mol
moles of Li = 2.29x10^-2 g / 6.9g/mol
= 0.0033 mol
Hope this helps
a sample of 23.2 grams of nitrogen gas is reacted with 23.2 G of hydrogen gas to produce ammonia. using the balanced equation below predict which of the reactants is the limiting reactant
Answer:
Hydrogen
Explanation:
First thing's first, we have to write out the balanced chemical equation for the reaction.
This is given as;
N2 + 3H2 --> 2NH3
From the stoichiometrey of the reaction;
Molar mass of N = 14
Molar mass of H = 1
(1 * (14 * 2)) = 28g of N2 reacts with (3 * (1 * 2)) = 6g of H2
This means that if there are equal mass of both Nitrogen and Hydrogen. We would run out of Hydrogen first. This means Hydrogen is our limiting reactant as it determines the amount of products that can be formed.
How many molecules are in each sample?
A. 4.9 g H2O
B. 54.4 g N^2
C. 89 g CCI4
D. 11 g C6H12O6
Answer:
To find the number of molecules first find the number of moles.
number of moles (n) = mass / molar mass (M)
then use the formula
N = n × L
where n = number of moles
N = number of entities
L = Avogadro's constant = 6.02 × 10^23entities to find the number of molecules
A. 4.9 g H2O
m = 4.9g
M = (2*1)+(16×1) = 2 + 16 = 18g/mol
n = 4.9/18 = 0.272mol
N = 0.272 × 6.02 × 10^23
= 1.6374*10^23 molecules of H2O
B. 54.4g of N2
m = 54.4g
M(N2) = 14×2 = 28g/mol
n = 54.4/28 = 1.942mol
N = 1.942 * 6.02*10^23
= 1.1690*10^24 molecules of N2
C. 89 g CCI4
m = 89g
M(CCl4) = 12 + (35.5 × 4) = 154g/mol
n = 89/154 = 0.577mol
N = 0.577 × 6.02 × 10^23
= 3.473*10^23 molecules of CCl4
D. 11 g C6H12O6
m = 11g
M(C6H12O6) = (12×6)+(12×1)+(16×6) =
180g/mol
n = 11/180 = 0.0611mol
N = 0.0611 × 6.02×10^23
= 3.678*10^22 molecules of C6H12O6
Hope this helps
PLEASE HELP ! ! ! Three quantum numbers are derived from Schrodinger’s equation that describe the probability of finding an electron around a nucleus: the principal quantum number, the angular momentum quantum number, and the magnetic quantum number. Define each quantum number.
Answer:
Principle Quantum Number: It describes the size of the orbital and the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..
Angular momentum Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...
Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of will be -2, -1, 0, +1, +2.
Answer:
Principal Quantum Number: designates the principal electron shell. Angular Momentum Quantum Number-This quantum number determines it's shape of an orbital and thus it's angular distribution. This quantum number determines the number of orbital numbers, their orientation within the sub-shell.
Principal Quantum Number, n
It describes the size of its orbital and of the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..
ngular Momentum Quantum Number l
It describes the shape of the orbital and thus the angular distribution. It can take from 0 to (n - 1). That is l = 0,1,2,...,(n - 1)
The magnetic Quantum Number, m
It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of will be -2, -1, 0, +1, +2.
Explanation:
What is the frequency of a wave traveling west with a velocity of 414 meters per second and a wavelength of 1.8 meters? hertz
Answer:
230hz
Explanation:
Hello,
To solve this question, we gave to use the relationship between velocity-frequency-wavelength to find the frequency in this question.
V = Fλ
V = velocity or speed of the wave
F = frequency of the wave
λ = wavelength of the wave
Data;
V = 414m/s
λ = 1.8m
f = ?
V = fλ
f = v/λ
f = 414/1.8
f = 230hz
The frequency of the wave is 230hz
Answer:
230
Explanation:
Number of
Protons
Number of
Neutrons
Atomic
Number
Mass
Number
Element
(symbol)
4.
2.
A
B
D
12
10
F
Using the periodic table, complete the table to describe each atom. Type in your answers.
A
B
C
D
E
F
Answer:1:En química, el número másico o número de masa es la suma del número de protones y el número de neutrones del núcleo de un átomo. Se simboliza con la letra A (el uso de esta letra proviene de alemán Atomgewicht, que quiere decir peso atómico, aunque sean conceptos distintos que no deben confundirse).
2:
give three example of mixture that can be separated by filtration process
Answer:
Mixture of sand and water.Mixture of chalk particles in water.Mixture of pebbles and water.Explanation:
Hope it helps.
What does the latent heat of fusion measure?
Answer:
The energy required to change the phase of a substance is known as a latent heat.
Explanation:
The energy require is Q= m L, where m is the mass of the substance and L is the specific latent heat of fusion or vaporisation which measures the heat energy to change 1 kg of a solid into a liquid. hope this helps you :)
Answer & Explanation:
The energy required to change the phase of a substance is known as a latent heat. ... The energy require is Q= m L, where m is the mass of the substance and L is the specific latent heat of fusion or vaporization which measures the heat energy to change 1 kg of a solid into a liquid.
Which of the following chemical reactions is reversible?
A. The burning of wood.
OB. The dehydration of copper sulfate (CuSO4).
O C. The neutralization of an acid.
OD. The freezing of water into ice
Reset Selection
Acids & bases/concentrationA mixture is made by mixing 425 mL of 0.94 M H2SO4 with 750. mL of 0.83 M NaOH. (a) What is the limiting reactant? (b) How much excess reactant will be left over? (c) Is this mixture acidic or basic? Why?(d) What is the concentration of the [H+] or [OH-] ions that remain in this solution?(e) Calculate the pH of this solution.
Answer:
a. NaOH is limiting reactant
b. 0.0882 moles H₂SO₄
c. Acidic
d. 0.15M [H⁺]
e. pH = 0.82
Explanation:
The reaction of NaOH with H₂SO₄ is:
2NaOH + H₂SO₄ → 2H₂O + Na₂SO₄
a. To calculate limiting reactant:
Moles NaOH:
750mL = 0.750L ₓ (0.83mol / L) = 0.6225moles NaOH
Moles H₂SO₄:
425mL = 0.425L ₓ (0.94mol / L) = 0.3995moles H₂SO₄
As 1 mole of H₂SO₄ reacts with 2 moles of NaOH, moles of NaOH that must react with 0.3995moles H₂SO₄ are:
0.3995moles H₂SO₄ ₓ (2moles NaOH / 1 mole H₂SO₄) = 0.799 moles of NaOH.
As you have just 0.6225 moles of NaOH
NaOH is limiting reactantb. 0.6225 moles of NaOH will react with:
0.6225 moles NaOH ₓ (1 mole H₂SO₄ / 2 mole NaOH) = 0.3113 moles H₂SO₄
That means will remain:
0.3995moles H₂SO₄ - 0.3113 moles H₂SO₄ =
0.0882 moles H₂SO₄c. As you have an excees of sulfuric ACID, the mixture will be acidic
d. From 1 mole of H₂SO₄ you will have in solution 2 moles of H⁺, thus, from 0.0880 moles of H₂SO₄you will obtain 0.0882*2 = 0.1764 moles of H⁺
In 425 + 750mL = 1175mL = 1.175L
[H⁺] = 0.1764 moles of H⁺ / 1.175L =
0.15M [H⁺]e. As pH is -log [H⁺]
pH = 0.82100 POINTS!!! :0! What two things do all chemical reactions have in common (tick 2)? 1. They create new substances- the substances you end up with are different from the ones you started with. 2. They do not create new substances- the products at the end look exactly the same as the reactants at the start. 3. They are reversible- you can get back the substances that you started with at the end of the reaction 4. They are irreversible- at the end of the reaction, you can't get back the substances you started with
Answer:
1 and 4
Explanation:
Answer:
Explanation:
The answer is 1st and 4th point
hope this helps
plz mark it as brainliest!!!!!!
Does sulfanamides toxic to humans ?and why
Answer:
No
Explanation:
Most sulfanamides are antibiotics, which kill the bacteria cells, but thankfully not human cells. They work by distrupting the production of dihydrofolic acid (form of folic acid that human/bacteria cells use for protein production).
Which will a positively charged object attract? an object that has a negative charge an object that has a smaller positive charge an object that has no charge an object that has a larger positive charge
Answer:
it will attract an object that has a negative charge
Positively charged objects will attract negatively charged objects.
Law of magnetic attractionsAccording to the law "like charges repel, unlike charges attract', a positively charged substance will repel other positively charged substances.
On the other hand, a positively charged substance will attract every other substance that is negatively charged.
More on the law of magnetic attraction can be found here: https://brainly.com/question/8515415
1.1 The elements with the lowest ionization energy of all element are
O The noble gases
O The alkali metals
O The alkaline earth metals
O The halogens
Answer:
O The alkali metalsThe elements with the lowest ionization energy of all element are alakli metals
Explanation:
According to research,
The element with the lowest ionization energy is cesium (Cs). Cesium has atomic number 55 and is in the fifth row of the periodic table.
Caesium is a soft, silvery-golden alkali metal .
Which of the following is an example of matter?
A. The air around you
B. Your thoughts
C. Radio waves
D. Heat from a fire
Answer:
A. The air around you
Explanation:
The air around us is an example of matter, as it is a gas.
Air has no definite shape/volume and has no definite structure, so it is a gas.
Our thoughts aren't matter because they have no physical atoms, and radio waves and heat waves aren't matter either because they are forms of energy.
The enthalpy of formation of water is –285.8 kJ/mol. What can be inferred from this statement? The enthalpy of the products is equal to the enthalpy of the reactants. Heat is absorbed during the process. Heat is released during the process. The enthalpy of the products is more than the enthalpy of the reactants.
Answer:
Heat is released during the process.
Explanation:
From the information provided in question, the enthalpy of formation of water is –285.8 kJ/mol. This is simply an exothermic reaction.
The negative sign indicates that the enthalphy of the reactants is more than the enthalphy of the products and as such, heat is released from the system into the surroundings.
The enthalpy of formation of water is –285.8 kJ/mol means that heat is released during the process.
What is enthalpy of formation of a substance?The enthalpy of formation of a substance is the amount of heat given off or absorbed when one mole of a substance is formed from the reactants.
A positive value for enthalpy means the reaction is endothermic while a negative value for enthalpy means the reaction is endothermic.
Therefore, the enthalpy of formation of water is –285.8 kJ/mol means that the reaction is exothermic and heat is released during the process.
Learn more about exothermic reactions at: https://brainly.com/question/2924714
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Which two pieces of data could indicate that a volcano is about to erupt?
A. A drop in average air temperature in one region
U
B. A decrease in the ocean level near a mountain range
O C. An increase in temperature near Earth's surface
D. A change in the types of gas detected in the air
U
SUBMIT
Answer:
D. A change in the types of gas detected in the atmosphere
Answer:
D: A change in the type of gas detected in the Air
C: An increase in temperature near Earth's Surface
Explanation:
I took the quiz. I Hope this helps!!
hi :) how to test if a solution is neutral?
Explanation:
solution is neutral because it added water and water is neutral solution
Which is a use for clay? ceramics batteries plaster chalk ED2020
Answer:
Answer is A.
Explanation:
I litterally just took the quiz in Edge and I got 100%.
Answer:
The answer is A.) Ceramics because clay can't make chalk, plaster, or batteries but ceramics is the form of art you use clay in. I also took the test on edge 2021.
Explanation:
The average score for games played in the NFL is 21.1 and the standard deviation is 8.9 points. 46 games are randomly selected. Round all answers to 4 decimal places where possible and assume a normal distribution.
A. P(21.4317 < ¯x < 22.7561) =
B. Q1 for the ¯x distribution =
The line next to the x should be over the x.
Answer:
A) P(21.4317 < ¯x < 22.7561) = 0.2975
B) Q1 for the ¯x distribution = 21.9844
Explanation:
The Central Limit theorem allows us to say that
Sample mean = Population mean = 21.1 points
Mean of sampling distribution = σₓ = (σ/√n)
σ = population standard deviation = 8.9 points
n = sample size = 46
σₓ = (8.9/√46) = 1.3122334098 = 1.3122
A) P(21.4317 < ¯x < 22.7561) =
This is a normal distribution problem
To find this probability, we will use the normal probability tables
We first normalize/standardize 21.4317 and 22.7561.
The standardized score of any value is that value minus the mean divided by the standard deviation.
For 21.4317
z = (x - μ)/σ = (21.4317 - 21.1)/1.3122 = 0.25
For 22.7561
z = (x - μ)/σ = (22.7561 - 21.1)/1.3122 = 1.26
The required probability
P(21.4317 < ¯x < 22.7561) = P(0.25 < z < 1.26)
Checking the tables
P(21.4317 < ¯x < 22.7561) = P(0.25 < z < 1.26)
= P(z < 1.26) - P(z < 0.25)
= 0.89617 - 0.59871
= 0.29746 = 0.2975 to 4 d.p.
B) Q1 for the distribution is the first quartile. The first quartile is greater than 25% of the distribution.
P(x > Q1) = 0.25
Let the z-score that corresponds to Q1 be z'
P(x > Q1) = P(z > z') = 0.25
But P(z > z') = 1 - P(z ≤ z') = 0.25
P(z ≤ z') = 1 - 0.25 = 0.75
From the normal distribution tables,
z' = 0.674
z' = (Q1 - μ)/σ
0.674 = (Q1 - 21.1)/1.3122
Q1 = 0.674×1.3122 + 21.1 = 21.9844228 = 21.9844 to 4 d.p.
Hope this Helps!!!
Water has a density of 1.0 g/ml and a test liquid has density of 1.1 g/ml. If you pour equal portions of the two liquids into a cup,what will happen ( assuming the two do not mix or create a chemical reaction)?
Answer:
Since the test liquid is denser than water, theoretically the test liquid would sink, but since the difference is so minor, the liquid poured after may float on top of the other liquid.
Explanation:
Answer:the test liquid will be on top.
Explanation:the test liquid has a higher density(1.1g/mol) than that of the water with density (1.0g/mol)
For the reaction of 2Na20, if you have 18.0 g of Na,
how many grams of O2 are needed for reaction?
Answer:
6.26 g of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction of sodium, Na and oxygen, O2 to produce sodium oxide, Na2O.
This is shown below:
4Na + O2 → 2Na2O
Next, we shall determine the masses of Na and O2 that reacted from the balanced equation.
This is illustrated below:
Molar mass of Na = 23 g/mol
Mass of Na from the balanced equation = 4 x 23 = 92 g
Molar mass of O2 = 16x2 = 32 g/mol
Mass of O2 from the balanced equation = 1 x 32 = 32 g.
From the balanced equation above,
92 g of Na reacted with 32 g of O2.
Finally, we shall determine the mass of O2 needed to react with 18 g of Na.
This can be obtain as follow:
From the balanced equation above,
92 g of Na reacted with 32 g of O2.
18 g of Na will react with = (18 x32)/92 = 6.26 g of O2.
Therefore, 6.26 g of O2 is needed for the reaction.
Which correctly lists the three gases that are part of Earth's cycles in both the atmosphere and biosphere?
O radon, carbon monoxide, oxygen
O carbon dioxide, nitrogen, oxygen
O nitrogen, carbon dioxide, carbon monoxide
O carbon dioxide, radon, oxygen
Answer:
The correct answer is actually, B) carbon dioxide, nitrogen, oxygen
Answer:
B
Explanation:
Kool-aid mixes with water is chemical or physical
Answer:
It is a physical change.
Explanation:
Answer:
its a physical change
Explanation:
physical changes no new substance is formed. so in this case it's still water just a change in color
Which is a cause of desertification? A.farming B.creating reservoirs C.overgrazing D.driving motor vehicles
Answer:
overgrazing
Explanation:
The main cause of desertification is Overgrazing.
What is desertification?Desertification is a type of dryland land degradation in which biological production is lost as a result of natural processes or human activity, causing productive areas to become progressively arid.
Overgrazing by the animals makes the land dry and loss in the vegetation.
Farming produces vegetation not destroy vegetation.Creating reservoirs does not make land dry.Driving motor vehicles is also not the reason of desertification.Hence Overgrazing is the cause of desertification.
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Iodine is used to detect and treat thyroid cancer. When iodine-131 gives off a beta particle, what is the new isotope called?
Answer:
Xenon- 131
Explanation:
Iodine- 131 ------------------> Xenon -131 + Beta particle
The distance between consecutive peaks or troughs in a wave is
A. wavelength.
B. displacement
C. amplitude.
D. frequency.
Answer:
A. Wavelength
Explanation:
Answer:
Wavelength
Explanation:
The distance between consecutive peaks or troughs in a wave is called the wavelength.
The diagram show the electron arrangements in the atom of 4 elements.
Which element does NOT form a covalent form?
The element does NOT forms a covalent bond is A
What is covalent Bond ?A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.
These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Therefore, The element does NOT forms a covalent bond is A
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Indicate the bonding type in each of the following compound CsBr
Answer:
Ionic bonding
Explanation:
A bond between a metal and a non-metal is an ionic bond and Since, Cesium is a metal and Bromine is a non-metal, It form the bond called Ionic Bond.
Which of the following properties of atoms decrease as you move down a column on the periodic table
Ionic radii
Ionization energy
Answer:
ionization energy
Explanation:
Answer:
was the other answer right?
Explanation:
1. Find the volume ( cm3) of oxygen in: a. 1000cm3 of air b. 50 cm3 of air.
Answer:
A. 210 cm³
B. 10.5 cm³
Explanation:
It is important for us to note that air contains 21% of oxygen, O2. With this idea in mind, let us answer the questions given above.
A. Volume of air = 1000 cm³
Volume of O2 in air =.?
Percentage composition of O2 in air = 21%
Volume of O2 = 21% x 1000
Volume of O2 = 21/100 x 1000
Volume of O2 = 210 cm³
Therefore, the volume of O2 in 1000 cm³ of air is 210 cm³.
B. Volume of air = 50 cm³
Volume of O2 in air =.?
Percentage composition of O2 in air = 21%
Volume of O2 = 21% x 50
Volume of O2 = 21/100 x 50
Volume of O2 = 10.5 cm³
Therefore, the volume of O2 in 50 cm³ of air is 10.5 cm³.