Answer:
12.5 g
Explanation:
From the question given above, the following data were obtained:
Half-life (t½) = 432 years.
Original amount (N₀) = 100 g
Time (t) = 1296 years
Amount remaining (N) =?
Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:
Half-life (t½) = 432 years.
Time (t) = 1296 years
Number of half-lives (n) =?
n = t / t½
n = 1296 / 432
n = 3
Thus, 3 half-lives has elapsed.
Finally, we shall determine the amount of the isotope remaining. This can be obtained as follow:
Original amount (N₀) = 100 g
Number of half-lives (n) = 3
Amount remaining (N) =?
N = 1/2ⁿ × N₀
N = 1/2³ × 100
N = 1/8 × 100
N = 0.125 × 100
N = 12.5 g
Thus, 12.5 g of the isotope is remaining.
How can we identify patterns of volcanic eruptions?
Use the following equation to answer the questions below:
Be + 2HCl → BeCl2 + H2
Answers are rounded.. pick the closest to your answer.
What is the mass of beryllium required to produce 25.0g of beryllium chloride? g
What is the mass of hydrochloric acid required to produce 25.0g of beryllium chloride? g
What is the mass of hydrogen gas produced when 25.0g of beryllium chloride is also produced? g
Explanation:
The equation of the reaction is given as;
Be + 2HCl → BeCl2 + H2
What is the mass of beryllium required to produce 25.0g of beryllium chloride?
1 mol of Be produces 1 mol of BeCl2
Converting to mass;
Mass = Molar mass * Number of moles
9.01g of Be produces 79.92g of BeCl2
xg of Be produces 25g of BeCl2
Solving for x;
x = 25 * 9.01 / 79.92
x = 2.82 g
What is the mass of hydrochloric acid required to produce 25.0g of beryllium chloride? g
Converting 25.0g of beryllium chloride to moles;
Number of moles = Mass / Molar mass
Number of moles = 25 / 79.92 = 0.3128 mol
2 mol of HCl produces 1 mol of BeCl2
x mol of HCl would produce 0.3128 mol of BeCl2
solving for x;
x = 0.3128 * 2 = 0.6256 mol
Converting to mass;
Mass = 0.6256 * 36.5 = 22.83 g
What is the mass of hydrogen gas produced when 25.0g of beryllium chloride is also produced? g
25g of BeCl2 = 0.3128 mol of BeCl2
From the equation;
1 mol of H2 is produced alongside 1 mol of BeCl2
This means;
0.3128 mol of H2 would also be produced alongside 0.3128 mol of BeCl2
Mass = Number of moles * Molar mass
Mass = 0.3128mol * 2.0159 g/mol = 0.6306 g
1.5 atm is the same pressure as... (1 atm
760 mmHg)
1100 mmHg
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Gas Laws
PressureStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 1.5 atm
[Solve] mmHg
Step 2: Identify Conversions
1 atm = 760 mmHg
Step 3: Convert
[DA] Set up: [tex]\displaystyle 1.5 \ atm(\frac{760 \ mmHg}{1 \ atm})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 1140 \ mmHg[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
1140 mmHg ≈ 1100 mmHg
Which product forms from a reaction between calcium (Ca) and phosphorus
(P)?
A. Ca2P3
B. Cap
C. CazP2
D. CaP2
Among these options, the correct formula for calcium phosphide is D. [tex]CaP_2[/tex]. Option D
The product formed from a reaction between calcium (Ca) and phosphorus (P) is calcium phosphide, which is represented by the chemical formula [tex]Ca_3P_2[/tex].
In the reaction between calcium and phosphorus, the calcium atom (Ca) donates two electrons to each phosphorus atom (P). This results in the formation of calcium ions (Ca2+) and phosphide ions (P3-). The ions combine to form the compound calcium phosphide ([tex]Ca_3P_2[/tex]).
The formula [tex]Ca_3P_2[/tex]indicates that three calcium atoms combine with two phosphorus atoms. The numerical subscripts are determined by the charges of the ions involved. Calcium, being a group 2 element, forms ions with a +2 charge (Ca2+), while phosphorus, being a group 15 element, forms ions with a -3 charge (P3-).
The product options provided are:
A. [tex]Ca_3P_2[/tex]
B. Cap
C. [tex]CazP_2[/tex]
D. [tex]CaP_2[/tex]
Among these options, the correct formula for calcium phosphide is D. [tex]CaP_2[/tex].
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Answer: Ca3P2
This is the answer!
Explanation:
A. Ca3P2
B. CaP2
C. Ca2P3
D. CaP
24.50 g of Na react with H20 to make sodium hydroxide and H2 gas. How much sodium
hydroxide is made if there is an excess of water?
Answer:
hay 4,240 gr
Explanation:
2Na + 2 H20 - --- 2 NO(OH) -+ H2n pued o es criibreo
Which two statements about redox reactions are true?
A. Double-replacement reactions are redox reactions.
B. Acid-base reactions are redox reactions.
C. One type of atom is oxidized and another is reduced.
D. Electrons are transferred from one atom to another.
SUBMIT
Answer:
C. One type of atom is oxidized and another is reduced
D. Electrons are transferred from one atom to another
Explanation:
just took the test, i hope this helps!!
have a nice day and take care of yourself!! :))
One type of atom is oxidized and another is reduced and Electrons are transferred from one atom to another. Therefore, the correct options are options C,D.
What is redox reaction?Any chemical process in which a participating chemical species' oxidation number changes is known as an oxidation-reduction reaction, often known as a redox reaction. The phrase refers to a broad range of processes. Numerous oxidation-reduction processes are as frequent and well-known as fire, metal corrosion and disintegration, fruit browning, respiration, and photosynthesis—basic life processes.
The combined processes of oxidation and reduction are known as redox reactions due to their complimentary nature. The oxidising agent is the reactant that causes the oxidation, while the reducing agent itself reduces this reagent. One type of atom is oxidized and another is reduced and Electrons are transferred from one atom to another.
Therefore, the correct options are options C,D.
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what type of energy is playing the piano
A.light
B. Thermal
C.electrical
D.mechanical
E.sound
Answer:
E sound
Explanation:
give the name of the method used to extract aluminium
PLEASE HELP I WILL MARK BRAINLIEST!
In a forest, lynx prey on rodents and birds in the summer. But because of rising temperatures, the birds in the forest have migrated to a cooler place. What effect will this migration have on the population of the rodents?
Because there are fewer birds, the lynx will prey on rodents, leading to a BLANK in their population. This scenario depicts BLANK competition.
Blank 1:
decline
rise
stagnancy
Blank 2:
apparent
direct
intraspecific
Answer:
The answer is decline and apparent
Explanation:
I took the test and got it right
convert to moles:
100.0g Ca3(PO4)2
Answer:
0.322 moles
Explanation:
Given Mass, m = 100 g
The molar mass of Ca₃(PO₄)₂
Ca₃(PO₄)₂ = (3 x 40.08) + (2 x 30.97) + (8 x 16.00)
M = 310.18 g/mol
Let there are n number of moles,
n = given mass/ molar mass
[tex]n=\dfrac{100 }{310.18 }\\\\n=0.322\ mol[/tex]
So, there are 0.322 moles.
What is the age of a bone that emits radiation from carbon-14 at the rate of 0.96
decays/min/g?
Match the gas sample with each others.
a. has the highest average molecular speed
b. has the lowest average molecular speed
c. has an average molecular speed between the highest and the lowest
1. _________0.564 moles of Ne in a 5.33 L container at a temperature of 308K
2. _________0.658 moles of Ne in a 2.05 L container at a temperature of 426K
3. _________ 0.128 moles of Ne in a 5.69 L container at a temperature of 426K
4. _________0.322 moles Of Ne in a 4.00 L container at a temperature of 398K
Answer:
a. The gas with the highest average molecular speed is the gas option 3.
b, The gas that has the lowest average molecular speed is the gas option 1.
c. The gas with average molecular speed between the highest and the lowest is the gas sample, option 4
Explanation:
From the kinetic theory of gases we have;
[tex]v_{rms} = \sqrt{\dfrac{3\cdot R\cdot T}{m} }[/tex]
Where;
[tex]v_{rms}[/tex] = The root mean square velocity of the gas
T = Temperature of gas in Kelvin
m = Mass of atom or molecule in kilograms
R = The universal gas constant
Therefore, [tex]v_{rms}[/tex] ∝ T and [tex]v_{rms}[/tex] ∝ 1/m
a. Therefore, the gas with the highest average molecular speed has the highest temperature, 'T', and the lowest mass, 'm', therefore, we have;
The gas with the highest average molecular speed is the gas option 3. with only 0.128 moles of Ne in 5.69 L container at a temperature of 426 K
b. The gas with the lowest average molecular speed has the lowest temperature, 'T', and the highest mass, 'm', therefore, we have;
The gas with the lowest average molecular speed is the gas option 1. with only 0.564 moles of Ne in 5.33 L container at a temperature of 308 K
c. The gas with an average molecular speed between the highest and the lowest is the gas with intermediate temperature and mass within the given gas samples
Therefore, the gas with the average molecular speed between the highest and lowest is the gas option 4. with 0.322 moles of Ne in 4.00 L container at a temperature of 398 K
Part A
Consider the following neutral electron configurations in which n has a constant value. Which configuration
would belong to the element with the most negative electron affinity, Eea?
View Available Hint(s)
a 2s2
b 2s²2p2
c 2s²2p5
d 2s²2p6
Answer:
c. 2s2 2p5
Explanation:
2s2 2p5 has 7 valence electrons and only needs one electron to complete the octet. This element will be the most electronegative.
Which has the least molecular kinetic energy?
water molecules in ...
A. a cloud
B. the ocean
C. Frozen pond
D. Pot of boiling water
*14.
How many atoms of sulfur are in 0.75 moles of carbon disulfide?
In matrix form structure PVC stands for what?
Answer:
polyvinyl chloride
Explanation:
When a large rock falls down a slope and breaks into small pieces, this is called _____________ _______________.
Group of answer choices
Answer: Mechanical weathering
Explanation:
Mechanical weathering breaks rocks into smaller pieces
Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.0% abundant. What is the average atomic mass for element Z?
Average atomic mass of Z = [mass]
Answer:
Average atomic mass = 19.9 amu
Explanation:
Isotopes can be defined as two or more forms of a chemical element that are made up of equal numbers of protons and electrons but different numbers of neutrons.
Generally, the isotopes of a chemical element have the same chemical properties because of their atomic number but different physical properties due to their atomic weight (mass number).
Given the following data;
Relative abundance of Z-19 = 55%
Relative abundance of Z-21 = 45%
Atomic mass of Z-19 = 19 amu
Atomic mass of Z-21 = 21 amu
To find the average atomic mass;
Average atomic mass = 19 * (55/100) + 21 * (45/100)
Average atomic mass = 19*0.55 + 21*0.45
Average atomic mass = 10.45 + 9.45
Average atomic mass = 19.9 amu
Therefore, the average atomic mass for element Z is 19.9 amu.
What is the second most consume grain in the world?
Answer:
Wheat!
Explanation:
Corn ranks first, Wheat, then Rice!
Which two parts of sedimentary rock formation include the breakdown and carrying away of existing rock?
Answer:
Cementation
Erosion
Explanation:
Cementation refers to hardening and welding of those sediments which are formed from preexisting rock fragments as a result of the precipitation of mineral matter in the spaces between the pore. The last stage in the formation of a sedimentary rock is Cementation.
Erosion is the geological process in which soil, rock, or dissolved material are worn away and transported from one location to another location by natural forces such as wind or water.
The two parts of sedimentary rock formation which include the breakdown and carrying away of existing rock are cementation and erosion.
Answer: The answer is A: Cementation and Erosion
Explanation: Hope this helps! happy new year
A random radioisotope has a decay constant of 0.00238 years-1. If
1165 years have past, and there was originally 80 grams of it,
roughly how many grams of the original radioisotope remain?
Answer:
5 grams remain
Explanation:
A = A₀exp(-k·t) 80g·exp(-0.00238yr⁻¹)(1165yrs) = 80g x 0.063 = 5 grams remain
Need help asap! Will give brainliest!!!!! (15pt)
Which scenario has been theorized as the possible fate of the universe?
A.
the big chill
B.
the big bang
C.
the big expansion
D.
the big heat
Answer:
Big Chill
Explanation:
Answer:
it's big chill or big freeze
This
Part A
A sample of ideal gas at room temperature occupies a volume of 21.0 L at a pressure of 712 torr. If the pressure changes to 3560 torr , with no change in
the temperature or moles of gas, what is the new volume, V?
Express your answer with the appropriate units.
View Available Hint(s)
HÅ
?
of 1
V2 =
Value
Units
Submit
Answer:
4.2 Liters (2 sig-figs)
Explanation:
Apply Boyles Law ... P₁V₁ = P₂V₂
P₁ = 712 Torr P₂ = 3560 Torr
V₁ = 21.0L V₂ = ?
P₁V₁ = P₂V₂ => V₂ = P₁V₁/P₂ = (712Torr)(21.0L)/(3560Torr) = 4.2 Liters (2 sig-figs)
Which element has the highest (most negative) electron affinity?
Ne, S,Na, Be, or Fe?
Answer:
S (Sulfur)
Explanation:
Electronegativity increases as you go up and right on the periodic table, excluding the noble gases on the rightmost column because they have zero electronegativity. S is the farthest right out of all the elements listed in the question excluding Ne.
Easy Chem, Will Give brainliest
Answer:
3.94 L
Explanation:
From the question given above, the following data were obtained:
Mass of O₂ = 5.62 g
Volume of O₂ =?
Next, we shall determine the number of mole present in 5.62 g of O₂. This can be obtained as follow:
Mass of O₂ = 5.62 g
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mole of O₂ =?
Mole = mass / molar mass
Mole of O₂ = 5.62 / 32
Mole of O₂ = 0.176 mole
Finally, we shall determine the volume of 5.62 g (i.e 0.176 mole) of O₂ at STP. This can be obtained as follow:
1 mole of O₂ occupied 22.4 L at STP.
Therefore, 0.176 mole of O₂ will occupy = 0.176 × 22.4 = 3.94 L at STP.
Thus 5.62 g (i.e 0.176 mole) of O₂ occupied 3.94 L at STP
Does anyone know how to do this
Answer:
Explanation:
1-butanol has 4 carbon atoms with an OH group at the first carbon atom.
Dichlorodifluoromethane has 1 carbon atom with 2 chlorine atoms and 2 fluorine atoms.
A gas with a volume of 4.0 L at a pressure of 2.02 atm is allowed to expand to a volume of 12.0
L. What is the pressure in the container if the temperature remains constant
P₂ = 0.67 atm
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightEquality Properties
Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of EqualityChemistry
Gas Laws
Boyle's Law: P₁V₁ = P₂V₂
P₁ is pressure 1V₁ is volume 1P₂ is pressure 2V₂ is volume 2Explanation:Step 1: Define
[Given] P₁ = 2.02 atm
[Given] V₁ = 4.0 L
[Given] V₂ = 12.0 L
[Solve] P₂
Step 2: Solve
Substitute in variables [Boyle's Law]: (2.02 atm)(4.0 L) = P₂(12.0 L)[Pressure] Multiply: 8.08 atm · L = P₂(12.0 L)[Pressure] [Division Property of Equality] Isolate unknown: 0.673333 atm = P₂[Pressure] Rewrite: P₂ = 0.673333 atmStep 3: Check
Follow sig fig rules and round. We are given 2 sig figs as our smallest.
0.673333 atm ≈ 0.67 atm
Due to the tendency to form crystals instead of discrete molecules the formula unit is the representative particle for ___ compounds
Answer:ionic
Explanation:
NASA helps fund science education
Answer:
What are the options
Explanation:
Answer:
"People with more knowledge of science are always healthier"
Explanation:
A salt with a high melting point can be obtained from reaction between metal and
acid solution. The metal that used in this reaction is iron and the acid solution is
hydrochloric acid.
a. What is the chemical name of salt above?
Iron (II) chloride and hydrogen gas
Chemical name:
FeCl2 (aq) + H2 (g)