Answer:
1/16
Explanation:
We have the half life of ²⁰O = 15 seconds
This half life means that the reactant 8s going to be half at this time
Now we have 60 seconds = 1 minute
Then in 60 seconds we are going to have 4 half life.
Then ²⁰O will be 1/2⁴
1/2⁴ = 1/16
This is the answer to this question.
Thank you!
1/16 fraction of a sample of pure ²⁰O remains after 1.0 minute
Given:
The half life of ²⁰O = 15 seconds
This half life means that the reactant 8s going to be half at this time
Now, we have 60 seconds = 1 minute
Then in 60 seconds we are going to have 4 half life.
Then ²⁰O will be 1/2⁴
1/2⁴ = 1/16
Thus, the fraction of a sample of pure ²⁰O remains after 1.0 minute is 1/16.
Learn more:
brainly.com/question/1160651
kinetic energy, elastic potential energy, and gravitational potential energy are all forms of
a. nuclear energy
b. chemical energy
c. mechanical energy
d. internal energy
Explanation:
the answer is internal energy..much like rubbing hands 2gether to make them warmer..
PLZZZ HHELLPPP!!! Submit your data table and atom diagram drawings. Remember to proofread your work before submitting.
Answer:
Draw a data table (search if you are unsure) and you then have to draw an atom diagram, make sure to label it, then submit your work.
Linus pauling is famous for?
Answer:
Linus Pauling became known as the founder of molecular biology due to his discovery of the spiral structure of proteins (Taton, 1964)
Explanation:
Why do we have to shield astronauts from solar wind?
Preventing exposure to high-energy particles is essential for the short-term success of the mission, and for the long-term health of the astronaut.
Which of the following is not a product of the reaction of zinc metal with nitric acid?
A. H2O
B. Zn2+
C. H2
D. NH4+
E. All of the above species are products.
Answer:
A. H2O
Explanation:
The balanced ionic equation for the reaction is:
[tex]Zn^{2+} + 2H^{+} NO_{3} ^{-1}[/tex] → [tex]Zn^{2+} (NO_{3} )^{-1} _{2} + H^{2+} _{2}[/tex]
This implies that the products of the reaction are zinc nitrate and hydrogen gas only.
Therefore, the outlier from the options is water (H2O)
Let me know if you have any other questions.
Would you expect molten sodium chloride to conduct electricity? why or why not?
Yes
When molten, sodium chloride is separated into its ions. These ions can carry a charge which means that sodium chloride can conduct electricity.
What is an example of a compound that contains fluorine?
Answer:
sodium fluoride
Explanation:
Question:
What is protecting us from the solar wind?
Answer:
The magnetic field
Explanation:
Why do people want different kinds of light bulbs?
Answer:
LED bulbs fit standard light sockets and are the most energy-efficient option. LEDs have lower wattage than incandescent bulbs but emit the same light output. This allows them to produce the same amount of light but use less energy. LEDs can last over 20 years and don't contain mercury
How many grams of ammonia(NH3) are produced from 6 moles of nitrogen. (Show all work)
Answer:
Mass = 204 g
Explanation:
Given data:
Mass of ammonia produced = ?
Number of moles of nitrogen = 6 moles
Solution:
Chemical equation;
N₂ + 3H₂ → 2NH₃
now we will compare the moles of nitrogen and ammonia.
N₂ : NH₃
1 : 2
6 : 2/1×6 = 12
Mass of ammonia;
Mass = number of moles × molar mass
Mass = 12 mol × 17 g/mol
Mass = 204 g
Select the compound with the lowest lattice energy.
A. CsBr(s)
B. NaCl(s)
C. SrO(5)
D. CaO(s)
E. KBr(s)
Answer:
A. CsBr(s)
Explanation:
we will get here compound with the lowest lattice energy
solution
As we know that Lattice energy is always proportional to the charge of ions and it is inversely proportional to the size of ions.
so that by the smallest charge and the largest size give us the lowest lattice energy and that charge and size is express as here as
Charge
Cs (+1), K(+1), Na (+1), Cl(-1), Br(-1), Sr(+2), Ca(+2), O(-2) .......................1
and
Size
Na+ < Ca2+ < K+ < Sr2+ < Cs+, O2- < Cl- < Br- ..........................2
so that here
correct answer is A. CsBr
The CsBr has the smallest charge and maximum size of the ions, the lattice energy of the compound has been the lowest. Thus option A is correct.
Lattice energy can be defined as the amount of energy required to remove a mole of ion to its gaseous state.
The lattice energy has been dependent on the charge and size of the ions.
Higher charge = Higher lattice energy
Higher size = Lower lattice energy
In CsBr, the charge of Cs has been +1, and the size of Br has been the smallest among the given.In NaCl, the charge of Na has been +1, and the size of Cl has been smaller than Br.In SrO, the charge of Sr has been +2, and the size of O has been smaller than Cl.In CaO, the charge of Ca has been +2, and the size of O has been smaller than Cl.In KBr the charge of K has been +1, and the size of Br has been the smallest among the given. However, the size of the K ion has been smaller than the Sr atom.Since the CsBr has the smallest charge and maximum size of the ions, the lattice energy of the compound has been the lowest. Thus option A is correct.
For more information about lattice energy, refer to the link:
https://brainly.com/question/17011733
Which of the following atoms is smallest: nitrogen, phosphorus, or arsenic?
Answer:
arsenic
Explanation:
nitrogen=155pm
phosphorus=195pm
arsenic =between 38 μm and 25 mm
indicate the pH value as pH < 7, pH = 7 or PH > 7 for each of the following substances.
a. Lemon juice
b. Water
c. Aqueous solution of MgO
d. Aqueous solution of Na2O
Explanation:
a) PH>7
b)PH=7
c)PH>7
d) PH>7
Anyone have a nursing major
Answer:
i maybe have one
Explanation:
1) A 10g sample of H2(g) reacts with a 22g sample of O2(g) according to
the equation: _H2(3)+ -_02(3)→ _H,0(1)
Which reactant is limiting? Which is in excess?
Answer:
H₂ is excess reactant and O₂ the limiting reactant
Explanation:
Based on the chemical reaction:
2H₂(g) + O₂(g) → 2H₂O
2 moles of H₂ react per mole of O₂
To find limiting reactant we need to convert the mass of each reactant to moles:
Moles H₂ -Molar mass: 2.016g/mol-:
10g H₂ * (1mol / 2.016g) = 4.96 moles
Moles O₂ -Molar mass: 32g/mol-:
22g O₂ * (1mol / 32g) = 0.69 moles
For a complete reaction of 0.69 moles of O₂ are needed:
0.69mol O₂ * (2mol H₂ / 1mol O₂) = 1.38 moles of H₂
As there are 4.96 moles,
H₂ is excess reactant and O₂ the limiting reactantWhich of the equations show the incomplete combustion of methane?
Answer:
?????/????
Explanation:
your answer is A 1000%
Percent composition. Please help meee :(
Answer:
Explanation:
Formula of percent composition:
% X = ( mass of element in compound / total mass of compound ) × 100
11) Al₂O₃
Al = 27 g/mol
O = 16 g/mol
%Al = (54 / 101.96) × 100
%Al = 52.9%
%O = (48 / 101.96) × 100
%O = 47.1%
12) C₅H₅O₅
C = 12 g/mol
H = 1 g/mol
O = 16 g/mol
C% = (60 / 145 ) × 100
C% =41.4%
H% = (5 / 145 ) × 100
H% =3.4%
O% = (80 / 145 ) × 100
O% = 55.2%
13) BaBr₂
Ba = 137.3 g/mol
Br =79.9 g/mol
Ba% = (137.3 / 297.14) × 100
Ba% = 46.2%
Br% = (159.8/ 297.14) × 100
Br% = 53.8%
14) Fe₃(PO₃)₂
Fe = 55.8 g/mol
P = 31 g/mol
O = 16 g/mol
Fe = (167.4/325.48) × 100
Fe = 51.43%
P = (62/325.48) × 100
P = 19.05%
O = (96 /325.48) × 100
O = 29.49%
Perform the following operation
and express the answer in
scientific notation.
7.06x105 : 5.3x10-2
[ ? ]x10?]
Answer:
37.42×10³
Explanation:
Scientific notation is the way to express the large value in short form.
The number in scientific notation have two parts.
. The digits (decimal point will place after first digit)
× 10 ( the power which put the decimal point where it should be)
we multiply the values that are without power of 10 and then we will multiply the power of ten by adding the exponent.
7.06×10⁵ × 5.3 ×10⁻²
37.42×10³
Answer:
37.42
Explanation:
This is easy
citrus cleanser changes red cabbage to what color
Answer:
I think it's green or blue...
What does it take in order for plates to move?
Answer:
Earth's thin outer shell is broken into big pieces called tectonic plates. These plates fit together like a puzzle, but they're not stuck in one place. They are floating on Earth's mantle, a really thick layer of hot flowing rock. The flow of the mantle causes tectonic plates to move in different directions.
Explanation:
The number of significant figures in 3.010 is
Answer:
The calculator shows 2280.3972, which rounds off to 2280, three significant figures. In scientific notation, this answer would be 2.28 x 103. Note this last use of scientific notation to indicate significant figures where otherwise you might not realize they were significant.
Explanation: I hope my answer has come to your help. God bless and have a nice day ahead!
Air, Sea water, alloy afe the examples of
a) Compound
b) Mixture
c) Element
d) Molecule
Answer:
B. Mixture
because air,sea water and alloy are example of Mixture
i need help with this
What is the role of light in photosynthesis?
Group of answer choices
Light provides the energy needed to convert water and carbon dioxide into sugar and oxygen.
Light does not play a role in photosynthesis.
Light splits into hydrogen and oxygen. The oxygen becomes waste but the hydrogen reacts with the light to produce glucose.
Light is absorbed by the plant and combines with water to make glucose.
Answer:
d
d
Explanation:d
Element with atomic number greater than Oxygen.
a. carbon
b. oxygen
c. nitrogen
d. sodium
Answer:
d.Na
...................
Quiestion 4
Based on your experimental data, which metal was likely used to make pennies after 1982?
Answer:
copper
Explanation:
i think it's copper because it's cheep and It exists in abundance
What is the electron configuration of the iodide ion?
A. 1s22s22p63s23p63d104s24p64d105s2
B. 1s22s22p63s23p63d104s24p6
C. 1s22s22p63s23p63d104s24p64d10
D. 1s22s22p63s23p63d104s24p64d105s25p6
Please try and put the answer first and then give an explanation.
Answer:
D. 1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,4d10,5s2,5p6
Explanation:
Hello!
In this case, since the standard iodine atom has 53 electrons, when it forms the iodide ion it is known it gains one spare electron so now it has 54; it means we need to write the new electron configuration up to 54 as shown below:
[tex]I^-:1s^2,2s^2p^6,3s^2,3p^6,4s^2,3d^{10},4p^6,5s^2,4d^{10},5p^6.[/tex]
Thus, the answer should be:
D. 1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,4d10,5s2,5p6
Even when the order is not the adequate one.
Regards!
Answer:
1s2,2s2,2p6,3s2,3p6,4s2, 3d10,4p6,5s2,4d10,5p6 is techically more correct, but in this case the closest answer given by the problem is D.
Explanation:
Note that in thereory, 4s2 is before 3d10 and 5s2 is before 4d10. However, this is not one of the choices, so the answer is D.
You have 3.012x10^23 molecules of sodium chloride - how many grams do you have?
Answer:
29.26 gram
Explanation:
No of molecules = no of mole × Avogadro's number
No of molecules = mass in gram/ molar mass × Avogadros number
Mass in gram =No of molecules×molar mass / Avogadros number
Mass in gram = 3.012 ×10^23 × 58.5/6.02×10^23
29.26 gram
Suppose "Element X" has a molar mass of 38.5 g/mol. How many atoms of Element X would be present in 2.78 mol?
Answer:
16.74×10²³ atoms
Explanation:
Given data:
Number of moles of X = 2.78 mol
Number of atoms = ?
Solution:
According to Avogadro number.
1 mole of any substance contain 6.022×10²³ atoms. Thus,
2.78 mol × 6.022×10²³ atoms / 1 mol
16.74×10²³ atoms
The number 6.022 × 10²³ is called Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
A blue whale has a length of 28,578 millimeters. What is the length of a blue whale in kilometers? Show your work below by writing the conversion factors you use to solve this question.
Answer:
Length of whale in km = 0.028578 km
Explanation:
Given:
Length of whale = 28,578 millimeter
Find:
Length of whale in km
Computation:
We know that;
1 km = 1,000,000 mm
So,
Length of whale in km = 28,578 / 1,000,000
Length of whale in km = 0.028578 km
Answer:
The answer is 0.28578 km, and the conversion is below in the explanation.
Explanation:
28578 mm * (1 meter/1000 millimeters) * (1 kilometer/1000 meters)
The millimeter units will cancel out, then the meter units will cancel out, leaving you with 28578/1000, then divide again by 1000. The answer is 0.028578 km.