Answer:
2, 19, 12 and 14 are the coefficients.
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
Review the equation below.
2KCIO3 > 2KCI + 3O2
How many moles of oxygen are produced when 2 mol of potassium chlorate (KCIO3) decompose?
A. 1
B. 2
C. 3
D. 6
The correct answer is C on edge 2021
Answer:
C) 3
Explanation:
Given data;
Number of moles of oxygen produced = ?
Moles of KClO₃ decomposed = 2 mol
Solution:
Chemical equation;
2KClO₃ → 2KCl + 3O₂
Now we will compare the moles of KClO₃ with O₂
KClO₃ : O₂
2 : 3
Thus, 3 moles of oxygen are produced.
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
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.
yo please I will give you ten points and if right a brainliest
Answer:
11.dependent
controlled
controlled
independent
independent
12.controlled
dependent
controlled
dependent
dependent
Explanation:
I HOPE IT HELPS :)
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.
In a redox reaction, what role does the reducing agent play?
A. It gives up electrons
B. It keeps its electrons
C. It takes electrons
D. It takes oxygen atoms
Answer:
(A) and (D)is the correct answer
Explanation:
(A) in terms of electronic concept and (D) in terms of classical concept
coz you know
hope, it helps.......
Answer:
A. It gives up electrons
Explanation:
on PLATO
I got 5 out of 5 on quiz
) In addition to ongoing sources, such as car engines, pollutants can also be introduced
into the air through isolated incidents like the rupture of a gas storage tank. Most
gases are stored and transported at high pressures. A common laboratory cylinder of
methane, for example, has a volume of 49.0 L and is filled to a pressure of 154 atm.
Suppose that all the CH4 from this cylinder is released and expands until its pressure
falls to 1.00 atm. What volume would the CH4 occupy?
Answer:
V₂ = 7546 L
Explanation:
Given data:
Initial volume = 49.0 L
Initial pressure = 154 atm
Final pressure = 1 atm
Final volume = ?
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
154 atm × 49.0 L = 1.00 atm × V₂
V₂ = 7546 atm. L/1 atm
V₂ = 7546 L
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
Which of the equations show the incomplete combustion of methane?
Answer:
?????/????
Explanation:
your answer is A 1000%
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
An 8.24 gram sample of a hydrated salt is heated until it has a constant mass of 6.20 grams. What was the percent by mass of water contained in the original sample
Answer:
32.9%
Explanation:
The mass of water present in the original sample can be calculated by the substraction:
m H₂O = sample mass before heating - sample mass after heatingm H₂O = 8.24 g - 6.20 g = 2.04 gThe percent by mass of water can be calculated with the formula:
Water Mass / Original Sample Mass * 100 %[tex]\frac{2.04}{6.20}[/tex] * 100% = 32.9%Element with atomic number greater than Oxygen.
a. carbon
b. oxygen
c. nitrogen
d. sodium
Answer:
d.Na
...................
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
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.
What is an example of a compound that contains fluorine?
Answer:
sodium fluoride
Explanation:
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
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:
Which is an inequality?
O A. 5+9
B. 1 +8 > 2 + 4
C. 2 = 4 - 2
D. 55
SUB
Answer:
B. 1 +8 > 2 + 4
Explanation:
Hello!
In this case, since inequalities show how a number is different, greater or less than, to an other, considering the given options, just B. 1 +8 > 2 + 4 is an inequality because if we solve the operation we obtain:
9 > 6
Which means that nine is greater than 6.
Best regards!
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.
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%
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.
Why is the perimeter around the Pacific Ocean referred to as the "Ring of Fire"?
Answer:I believe it’s because of the volcanos making up the ring
Explanation:
How many grams in 11.9 moles of sulfur? Avogadro’s number: 6.02x1023 atoms = 1 mole Molar mass of sulfur: 32.06 g sulfur = 1 mol sulfur
A. 382.51 grams
B. 0.37 grams
C. 1.97x10-23 grams
D. 7.17x1024 grams
Answer:
Mass = 0.37 g
Explanation:
Given data:
Number of moles of sulfur = 11.9 mol
Mass of sulfur in 11.9 mol = ?
Molar mass of sulfur = 32.06 g
Solution:
Number of moles = mass/molar mass
by putting values,
11.9 mol = mass/ 32.06 g/mol
Mass = 11.9 mol × 32.06 g/mol
Mass = 0.37 g
Select the correct electron configuration for Vanadium. (Atomic Number 23)
1s 22s 22p 63s 23p 84s 23d 1
1s 22s 62p 33s 23p 44s 23d 5
1s 22s 22p 63s 23p 64s 23d 3
1s 22s 22p 53s 23p 74s 13d 4
Explanation:
Vanadium is in Period 4 and in the d-block of elements. The highest energy subshell is 4s. (because as electrons fill the 3d subshell, the subshell becomes of lower energy than 4s)
We have 1s²2s²2p⁶3s²3p⁶3d³4s².
Answer:
Vanadium (V) --- d-block element
Location on the periodic table :
4th Period5th GroupAtomic number=23
Atomic mass=51 g/mol
The correct electron configuration for Vanadium is:
V= [Ar]4s²3d³ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³
3. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³ is the right answer.
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
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
citrus cleanser changes red cabbage to what color
Answer:
I think it's green or blue...
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