Answer:
Mass = 6.706 g
Explanation:
Given data:
Mass of lithium hydroxide = ?
Volume of lithium hydroxide = 450 mL (450/1000 = 0.450 L)
Molarity of lithium hydroxide = 0.55 M
Solution:
Formula:
Molarity = number of moles / volume in L
0.55 M = number of moles / 0.450 L
Number of moles = 0.55 M × 0.450 L
Number of moles = 0.25 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 0.25 mol × 23.95 g/mol
Mass = 6.706 g
Arrange the atoms in an increasing order of ionization energy. Choose the correct order below.
A.
Hydrogen, Helium, Beryllium, Lithium
B.
Hydrogen, Helium, Lithium, Beryllium
C.
Lithium, Hydrogen, Beryllium, Helium
D.
Lithium, Beryllium, Hydrogen, Helium
Which test uses color change to reveal oil-based paints?
mass spectometry
gas chromatography
potassium hydroxide test
ethanol test
Answer:
potassium hydroxide test
Explanation:
The test that uses color change to reveal oil-based paints is the potassium hydroxide test. The correct option is c.
What is a potassium hydroxide test?The KOH (potassium hydroxide) approach is used to test for yeast in specimens. Potassium hydroxide acts as an enzymatic agent, breaking down detritus in a specimen, such as epithelial cells and WBCs, allowing yeast or pseudohyphae to be seen.
The potassium hydroxide prep test is used to detect fungal diseases on the skin or in the nails. A scrape of cells from the afflicted area is examined under a microscope for evidence of fungus. The potassium hydroxide skin lesions exam, fungal smear, or skin scraping are other names for the potassium hydroxide test.
Therefore, the correct option is the c, potassium hydroxide test.
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2. The combustion of octane is -47.5 kJ/g.
a. Write the reaction for the combustion of octane.
b. What is the value of the enthalpy of combustion for octane per mole?
c. If the enthalpy of combustion was written with the reaction, what value would be
used?
The enthalpy of combustion per mole is -5397.7 kJ/mol.
What is combustion?The term combustion refers to a reaction in which a substance is burnt in oxygen. Now we know that octane is a hydrocarbon and its combustion follows the general equation for the combustion of hydrocarbons.
[tex]2C_{8}H_{18} (g) + 25O_{2} (g)---- > 16CO_{2} (g) + 18H_{2} O(g)[/tex]
Given that the number of moles in one gram of octane is obtained from;
1g/114 g/mol = 0.0088 moles
If the burning of 0.0088 moles of octane produces -47.5 kJ
Burning of 1 mole of octane would produce 1 mole * -47.5 kJ/0.0088 moles
= -5397.7 kJ/mol
We can now write is as;
[tex]2C_{8}H_{18} (g) + 25O_{2} (g)---- > 16CO_{2} (g) + 18H_{2} O(g)[/tex] ΔH = -5397.7 kJ/mol
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ASAP pleaseee and Thankyou
Why Are Microorganism's Used to separate waste products from water?
Answer:
Untreated water from rivers, lakes, ponds, springs, or streams is likely to contain unsafe levels of infectious microorganisms, and drinking it may cause illness.
Explanation:
. Both element K and element L are found in period 3 of the periodic
table. If K is in group 13 while L is in group 15, which of the two
has a greater atomic number? Explain.
Answer: L element has greater atomic number.
Explanation:
The periodic table contains vertical columns called as groups and horizontal rows called as periods.
Period 3 contains 8 elements which are sodium, magnesium , aluminium , silicon , phosphorous , sulphur, chlorine and argon.
K element which belongs to group 13 is aluminium with atomic number of 13 . L element which belongs to group 15 is phosphorous with atomic number of 15.
Thus L element has greater atomic number.
What is it called when electrons fall back down to their normal energy level and release a photon of light? (Please help I think its called a quantum leap but im not sure!!)
Answer: Photoelectric effect
Explanation:
Michael’s teacher showed him a sample of charcoal dust and a diamond, as seen in the table below. He was very surprised when she told him both substances were made up of carbon. Why do these two forms of carbon look so different?
Answer:
They are isotopes of each other ,meaning they are made of chemically the same substance but the number of neutrons is different.
Explanation:
An atom has a diameter of 2.00 Å and the nucleus of that atom has a diameter of 7.50×10−5 Å . Determine the fraction of the volume of the atom that is taken up by the nucleus. Assume the atom and the nucleus are a sphere
Answer:
The fraction of the volume of the atom that is taken up by the nucleus is 4.6656\times 10^{-14}4.6656×10
−14
.
The density of a proton is 6.278\times 10^{14} g/cm^36.278×10
14
g/cm
3
.
Explanation:
Diameter of the atom ,d = 2.50 Å
Radius of the atom ,r = 0.5 d=0.5 × 2.50 Å = 1.25Å
Volume of the sphere= \frac{4}{3}\pi r^3
3
4
πr
3
Volume of atom = V
V=\frac{4}{3}\pi r^3V=
3
4
πr
3
..[1]
Diameter of the nucleus ,d' = 9.00\times 10^{-5}\AA9.00×10
−5
A
˚
Radius of the nucleus ,r' = 0.5 d'=0.5\times 9.00\times 10^{-5}\AA=4.5\times 10^{-5}\AA0.5×9.00×10
−5
A
˚
=4.5×10
−5
A
˚
Volume of nucleus = V'
V=\frac{4}{3}\pi r'^3V=
3
4
πr
′3
..[2]
Dividing [2] by [1]
\frac{V'}{V}=\frac{\frac{4}{3}\pi r'^3}{\frac{4}{3}\pi r^3}
V
V
′
=
3
4
πr
3
3
4
πr
′3
=\frac{r'^3}{r^3}=\frac{(4.5\times 10^{-5}\AA)^3}{(1.25 \AA)^3}=
r
3
r
′3
=
(1.25
A
˚
)
3
(4.5×10
−5
A
˚
)
3
\frac{V'}{V}=4.6656\times 10^{-14}
V
V
′
=4.6656×10
−14
The fraction of the volume of the atom that is taken up by the nucleus is 4.6656\times 10^{-14}4.6656×10
−14
.
Diameter of the proton ,d = 1.72\times 10^{-15} m = 1.72\times 10^{-13} cm1.72×10
−15
m=1.72×10
−13
cm
1 m = 100 cm
Radius of the proton,r = 0.5 d=0.5\times 1.72\times 10^{-13} cm=8.6\times 10^{-14} cm0.5×1.72×10
−13
cm=8.6×10
−14
cm
Volume of the sphere= \frac{4}{3}\pi r^3
3
4
πr
3
Volume of atom = V
V=\frac{4}{3}\times 3.14\times (8.6\times 10^{-14} cm)^3=2.664\times 10^{-39}cm^3V=
3
4
×3.14×(8.6×10
−14
cm)
3
=2.664×10
−39
cm
3
Mass of proton, m = 1.0073 amu = 1.0073\times 1.66054\times 10^{-24} g1.0073×1.66054×10
−24
g
1 amu = 1.66054\times 10^{-24} g1amu=1.66054×10
−24
g
Density of the proton : d
d=\frac{m}{V}=\frac{1.0073\times 1.66054\times 10^{-24} g}{2.664\times 10^{-39}cm^3}=6.278\times 10^{14} g/cm^3d=
V
m
=
2.664×10
−39
cm
3
1.0073×1.66054×10
−24
g
=6.278×10
14
g/cm
3
The density of a proton is 6.278\times 10^{14} g/cm^36.278×10
14
g/cm
3
.
Explanation:
set as brainliest
Ms. Salis explains to her class that sodium (Na) and chlorine (Cl) atoms bond to make table salt
(NaCl). Which is the best description of table salt? *
A)It is a cell.
B)It is an atom.
C)It is an element.
D)It is a compound
8. An elevator is moving upward with a speed of 11 m/s. Three
seconds later, the elevator is still moving upward but its
speed has been reduced to 5 m/s. What is the elevator's
acceleration?
Answer:
Average acceleration = - 2 m/s^2
Explanation: Have a nice day
What is the mass of 0.78 mol Mg(NO3),? Make sure to round to the correct number of sig figs and to include the unit in your final answer
Answer:
67.08 g
Explanation:
you firts write what u know
then u calculate the molar mass of the salt
then according to the formula mass= number of mols × molar mass you find the mass
m= mass
n= number of mol
M= molar mass i hope this helps
In TEN complete sentences, describe how the LAW OF CONSERVATION applies to the stuff YOU OWN. For example: In real life, can new XBOXs be magically created, or garbage magically destroyed? Why? You are made up of recycled atoms. Where did these atoms come from? *
Answer:
Both the initial and final substances are composed of atoms because all matter is composed of atoms. According to the law of conservation of matter, matter is neither created nor destroyed, so we must have the same number and type of atoms after the chemical change as were present before the chemical change.
Explanation:
The atoms that make up your body were produced inside a star and have ... I read once that atoms get recycled so much through the planet that each of ... from William Shakespeare, but I do know this: All of us come from stars. ... If you have gold fillings in your teeth, those atoms came from a star explosion.
What were the purposes of this document? Check all that apply. to extend the rights of sovereignty to all states in the Union to declare rights and powers of the United States to mobilize the Louisiana militia for the coming war to dissolve the political bonds between Louisiana and the United States to declare that Louisiana was a free and independent state
Answer:
Sorry that I'm late but the correct answers are to dissolve the political bonds between Louisiana and the united states and to declare that Louisiana was a free and independent state, or D and E
Explanation:
Answer:
The last two
Explanation:
2. Water is an example of a(n)
a. inorganic b. organic
compound.
d. none of these
c. carbon
it would be A ,inorganic Compound
When a car takes a sharp turn to the left and the person in the car slides to the right, this
is an example of
A. Newton's First Law of Motion
B. Newton's Second Law of Motion
C. Newton's Third Law of Motion
D. Newton's Law of Gravity
Answer:
It is newtons First Law:)
Explanation:
Based on the organization and colors in the periodic table, which two elements do you think are most similar in terms of their properties magnesium (Mg) , barium (Ba) , and gold (Au) ? Explain .
Answer:
Magnesium and barium
Explanation:
They are both Alkaline earth metals. All the alkaline earth metals react with water to produce hydrogen gas and the metal hydroxide, although somewhat less vigorously than the alkali metals.
The organization and colors in the periodic table magnesium and barium are the two element with most of the similar properties because they both belongs to alkaline earth metals.
What are periodic table?
Periodic table are defined as an arrangement of all the elements known to man in accordance with their increasing atomic properties and recurring chemical properties. 118 elements are arranged in periodic table.
Alkaline earth metals are defined as any of the divalent strongly basic metal of group 2 of a periodic table comprising beryllium, magnesium, calcium, barium and radium.
Thus, the organization and colors in the periodic table magnesium and barium are the two element with most of the similar properties because they both belongs to alkaline earth metals.
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Which of the following definitions best describes a parallel of latitude?
a--A line that is drawn horizontally around the earth and is parallel to the Prime Meridian.
b---A line that is drawn vertically down the earth and is parallel to the equator.
c--A line that is drawn vertically down the earth and is parallel to the Prime Meridian.
d--A line that is drawn horizontally around the earth and is parallel to the equator.
The statement that express the definitions of parallel of latitude as regards this question is :A: A line that is drawn horizontally around the earth and is parallel to the Prime Meridian.
A circle of latitude can be regarded as a line of latitude that found on Earth, it can be explained as abstract (east–west) small circle which connect all locations around Earth and this is been done at a particular latitude coordinate line.It is drawn horizontally and usually parallel to Prime Meridian.Therefore, option A is correct.
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. If the half-life of cesium-133 is 30 years, how much of a 600g sample of cesium-133 will be left after
150 years
Answer:
Caesium (55Cs) has 40 known isotopes, making it, along with barium and mercury, one of the elements with the most isotopes. The atomic masses of these isotopes range from 112 to 151. Only one isotope, 133Cs, is stable. The longest-lived radioisotopes are 135Cs with a half-life of 2.3 million years, ... It constitutes most of the radioactivity still left from the Chernobyl accident ...
You have used 2. 6×102 L of distilled water for a dialysis patient. How many gallons of water is that?
By unit conversion, the distilled water for dialysis in gallons is 68.69 gallons.
We need to know about unit conversion to solve this problem. The unit conversion can be used to convert a unit to another unit. It can be defined as
a = xb
where a is unit a, b is unit b and x is the constant of conversion.
From the question above, we know that
V = 2.6 x 10² liters
The unit conversion that we used is (1 gal = 3.785 liters)
V = 2.6 x 10² liters
V = 2.6 x 10² / 3.785 gal
V = 68.69 gallons
Hence, the distilled water for dialysis in gallons is 68.69 gallons.
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The vertical columns (top to bottom) on the periodic table are called
Answer:
group
Explanation:
the rows are called periods
groups 1-8
can someone help please !!!!
Answer:
x = 231/90 Th
Explanation:
PLS ANSWER THESE 3 QUESTIONS WHICHEVER YOU KNOW!!
1.For an object at rest, the normal force equals the gravitational force. What is the sum of these forces called?
·ω·
A Net force
B Unbalanced force
C Inertia
D Potential force
2. Which of the following best describes the forces when there are different-sized forces from opposite directions acting on an object?
a Positive
b Negative
c Unbalanced
d Gravitational
3. An object is at rest on a table. The gravitational force is 10 N down, and the normal force is 10 N up. What is the net force?
An object at rest on a table. An arrow pointing down represents 10 newtons of gravitational force. An arrow pointing up represents 10 newtons of normal force.
a 10 N up
b 0 N
c 10 N down
d 20 N up
Answer:
I only know 3 its 0 N because 10-8=2 and 2-2=0
Explanation 10-8=2 2-2=0
Why do you think the mass of the egg changed in water and salt water?
Prompt
The skeletal system, the muscular system, and the nervous system all work together. Explain one link between the skeletal system and the muscular system, between the skeletal system and the nervous system, and between the muscular system and the nervous system.
Answer:
They work in unision
Explanation:
The skeletal system is the framework our muscular system is attached to. The muscular system also allows the bones to move through contracting and extending. Although both would be useless without the nervous which sends impulses that tell the muscles to contract and extend.
Answer:
The person above is correct!
Explanation:
It graded it 100%.
Which compound listed below has the largest molar mass?
Ca(OH)2
H20
CaCl2
NH3
Answer: the answer would be CaCI2
Explanation: this was one of my exam questions i got right. :)
ice _______________ - a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice.
Answer: Frost weathering is a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice.
Two students are given different samples of a substance and are instructed to determine the properties of the substance.
Which statement describes a property that will be the same for both students?
color because it is an extensive property
mass because it is an extensive property
boiling point because it is an intensive property
volume because it is an intensive property
Answer:
C) Boiling point because it is an intensive property.
The statement describes a property that will be the same for both students is (B). mass because it is an extensive property Hence Option (B) is correct.
What is an Extensive Property ?A property known as an extensive property depends on the quantity of materials in a sample. A couple of instances of extensive attributes are mass and volume.
According to how a property varies as the system's size changes, physical qualities of materials and systems are sometimes classified as either intensive or extensive.
Therefore, The statement describes a property that will be the same for both students is (B). mass because it is an extensive property Hence Option (B) is correct.
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Well i still kinda don't get the differences of climate and weather.so what i need help with is what are the differences of climate and weather?
Answer:
climate
Explanation:
climate is the weather conditions for a long period of time, weather is the short term conditions of a location. The answer would be climate because the general climate is colder.
Answer:
D climate
Explanation:
Alright here is a sum up, Weather is the rain, coldness, heat all through the days, like tommorow will be raining. that is weather, weather = short term. climate is the area on the equator, so florida will be warmer than canada, so climate = long term
which is an expression of molality
Answer:The formula for molality is m = moles of solute / kilograms of solvent.
Explanation: