Answer:
The atomic number of an atom [ number of protons ] is the number of electrons of an atom.
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aluminum has a density of 2.70 g/mL. Calculate the mass (in grams) of a piece of aluminum having a volume of 344 mL
Answer:
[tex]\boxed {\boxed {\sf 928.8 \ grams}}[/tex]
Explanation:
Density is the mass per unit volume of a substance. The following formula is used for calculating density.
[tex]\rho= \frac{m}{v}[/tex]
We know the density of aluminum is 2.70 grams per milliliter. The mass is unknown, but we know the piece of aluminum has a volume of 344 milliliters.
ρ= 2.70 g/mL v= 344 mLSubstitute these values into the formula.
[tex]2.70 \ g/mL = \frac {m}{344 \ mL}[/tex]
We are solving for the mass, so we must isolate the variable m. It is being divided by 344 milliliters. The inverse operation of division is multiplication. Multiply both sides of the equation by 344 mL.
[tex]344 \ mL *2.70 \ g/mL = \frac {m}{344 \ mL} * 344 \ mL[/tex]
[tex]344 \ mL *2.70 \ g/mL =m[/tex]
The units of milliliters cancel.
[tex]344 *2.70 \ g=m[/tex]
[tex]928.8 \ g =m[/tex]
The mass of the piece of aluminum is 928.8 grams.
Please solve these two QUESTION .
its my ASSIGNMENT
Explanation:
It is the total mass of protons and neutrons in an individual atom or isotope. Since, Atomic Mass is total mass of protons and neutrons in an individual atom or isotope and not the actual weight of an Atom.
this means that it exists in the form of isotopes and is generally in fraction.
Which pair of reactants for a Grignard reaction does not give 2-phenylbutan-2-ol after an aqueous workup?
Take a look at your rubbing alcohol at home. What is its main composition?
Answer:
It is a mixture of denatured alcohol, water, and agents added to make the alcohol unpalatable to drink.
what type of orbital is occupied by an electron with the quantum numbers n=3, 1=2? How many degenerate orbital's of this type are found in a multi electron atom
The orbital is occupied by an electron with the quantum numbers n=3, l=2 will be 3d where n is orbit and l is band the d orbital have 5 degenerate orbitals.
What are orbit and orbitals?Orbitals are the well defined circular paths into which electron revolve around the nucleus in 2D mostly denoted by K L M N etc and all of them will be circular in the shape and non directional as well.
Orbitals are the 3D space of the nucleus where the probability of finding the electron will always be greater or maximum denoted by s p d and f and having shapes like s orbital is spherical shaped p orbital is in some other shape.
Therefore, orbital is occupied by an electron with the quantum numbers n=3, l=2 will be 3d where n is orbit and l is orbital and the d orbital have 5 degenerate orbital's.
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why does copper Cu (I) have a short lifespan
Answer:
Copper (Cu), chemical element, a reddish, extremely ductile metal of Group 11 (Ib) of the periodic table that is an unusually good conductor of electricity and heat. Copper is found in the free metallic state in nature.
Explanation:
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Which among the following represents a set of isotopes? Atomic nuclei containing:
a) 20 protons and 20 neutrons
b) 21 protons and 19 neutrons
c) 22 neutrons and 18 protons
d) 20 protons and 22 neutrons
e) 21 protons and 20 neutrons
Answer:
d. 20 protons and 22 neutrons
Atomic nuclei containing 20 protons and 22 neutrons. Thus, option D is correct.
What is an electron?
An electron is defined as a subatomic particle which is charged negatively either bound to an atom or not it means free. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.
The nature of electron is free it means they are present freely in nature and consist of an atom.The main function of electron is that they play the role of negatively- charged component of an atom.
The electrons are primary source of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.
Therefore, Atomic nuclei containing 20 protons and 22 neutrons. Thus, option D is correct.
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Which of the following is an example of a connection between the hydrosphere and the
lithosphere?
A.waves eroding rocks on the beach
B.water evaporating to form clouds
C.fish swimming in a river
D.boats transporting goods
Answer:For example, rain (hydrosphere) falls from clouds in the atmosphere to the lithosphere and forms streams and rivers that provide drinking water for wildlife and humans as well as water for plant growth (biosphere). River action erodes banks (lithosphere) and uproots plants (biosphere) on the riverbanks.
Explanation:b
We have that examples of a connection between the hydrosphere and the
lithosphere are
Water evaporating to form cloudsFish swimming in a riverOption A and B
The hydrosphere bears rain that falls in the atmosphere and creates water bodies on earth by combining with the lithosphere
Therefore
Water evaporating to form cloudsFish swimming in a riverAre examples of a connection between the hydrosphere and the
lithosphere.
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1°C rise in temperature is equal to a rise of
Answer:
1°C rise in temperature is equal to a rise of 59°F
Answer:
Hence 1℃ rise in temperature is equal to the rise in 59℉.
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Have these points
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Why does iodine have a lower average atomic mass that tellurium? Can you find other examples of this in the periodic table?
what is chemical change ?
[tex]\huge{ \color{violet}{ \boxed{ \color{hotpink}{Answer}}}}[/tex]
➣ Chemical ChangeIt occurs when new materials are formed by a change in the way the atoms are bonded together.Heat, light or electrical energy is often emmitted or absorbed.[tex] \: [/tex]
[tex]\large\tt\:⚘ \: MishiChaeYoon \: ⚘[/tex]
Calculate the number of moles for 50.7 g of hydrogen gas
Answer: 50.7 moles
Explanation:
given mass/ molecular mass
= 50.7/1
=50.7
Answer:
[tex]\boxed {\boxed {\sf 25.1 \ mol \ H_2}}[/tex]
Explanation:
We are asked to calculate the number of moles in 50.7 grams of hydrogen gas. To do this, we will use the molar mass or the mass of 1 mole of a substance. These values are found on the Periodic Table because they are equivalent to the atomic masses, but the units are grams per mole instead of atomic mass units.
Look up the molar mass of hydrogen (H).
H: 1.008 g/molNote that we are given grams of hydrogen gas. This is a diatomic molecule with 2 hydrogen atoms. The formula is H₂. Multiply the molar mass by 2 to find hydrogen gas's molar mass.
H₂ = 1.008 *2 = 2.016 g/molNow we can convert using dimensional analysis. Set up a ratio using the molar mass.
[tex]\frac {2.016 \ g \ H_2}{1 \ mol \ H_2}[/tex]
We are converting 50.7 grams to moles, so we multiply the ratio by this value.
[tex]50.7 \ g \ H_2 *\frac {2.016 \ g \ H_2}{1 \ mol \ H_2}[/tex]
Flip the ratio so the units of grams of hydrogen gas cancel.
[tex]50.7 \ g \ H_2 *\frac{1 \ mol \ H_2} {2.016 \ g \ H_2}[/tex]
[tex]50.7 \ *\frac{1 \ mol \ H_2} {2.016 }[/tex]
[tex]\frac {50.7} {2.016 } \ mol \ H_2[/tex]
[tex]25.14880952 \ mol \ H_2[/tex]
The original value of grams (50.7) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tenths place. The 4 in the hundredth place to the right tells us to leave the 1 in the tenths place.
[tex]25.1 \ mol \ H_2[/tex]
50.7 grams of hydrogen gas is equal to approximately 25.1 moles of hydrogen gas.
A graduated cylinder is filled with 20ml of water. A rock is dropped in to the graduated cyclinder and the volume of water rises to 30ml
inside the graduated cylinder. The mass of the rock is 23g. What is the density of the rock?
2.3g/ml
0.77g/ml
5g/ml
1.15g/ml
Answer:
[tex]\boxed {\boxed {\sf 2.3 \ g/mL}}[/tex]
Explanation:
We are asked to find the density of a rock. Density is the substance's mass per unit volume. The formula for calculating density is:
[tex]\rho= \frac{m}{v}[/tex]
The mass of the rock is 23 grams. The volume was found using water displacement. A known amount of water was measured, the rock was added to the graduated cylinder, and the water level was recorded again. The volume is the difference between the final and initial water level. The graduated cylinder originally had 20 milliliters and the water rose to 30 milliliters.
volume = final water level - initial water level volume = 30 mL - 20 mLvolume = 10 mLNow we know the mass and the volume.
m= 23 g v= 10 mLSubstitute the values into the formula.
[tex]\rho= \frac{ 23 \ g }{30 \ mL}[/tex]
Divide.
[tex]\rho= 2.3 \ g/mL[/tex]
The density of the rock is 2.3 grams per milliliter.
Where are the metals located on the periodic table? the nonmetals?
Answer:
The metals are located on the left and the non-metals are located on the right.
Explanation:
Hope this helps :)
Question
"Drag each tile to the correct location on the concept map", for the question.
Read the instructions for this self-checked activity. Respond to each question, and check your answers. At the end of the activity, write a brief
evaluation of your work.
Answer:
i hope this helps, also you might want to put it into your own words because this was directly from the answer key :)
Explanation:
Faustus Faustus is the protagonist of the play. He is a brilliant scholar who makes a deal with Lucifer to exchange his soul for magical power. He later regrets his decision, but it’s too late and his soul is carried away to hell.
Mephastophilis Mephastophilis is a demon that Faustus calls upon to help him with magic. He turns into Faustus's servant in his pact with the devil.
Valdes and Cornelius Valdes and Cornelius are friends of Faustus who teach him the art of black magic.
three scholars The three scholars are friends of Faustus who are concerned about his welfare.
Lucifer Lucifer (the devil) is Mephastophilis’s master. He makes a deal with Faustus.
Wagner Wagner is Faustus’s servant. He learns how to work magic from his master’s books.
clown The clown becomes Wagner's servant. He provides comic relief in the story.
good angel The good angel is a spirit that tries to get Faustus to repent.
evil angel The evil angel is a spirit that tempts Faustus to rebel against God and make a pact with the devil.
the pope The pope is the head of the Roman Catholic Church and symbolizes the religious beliefs that Faustus has abandoned.
horse-courser The horse-courser is a horse trader who purchases a horse from Faustus.
old man The old man is a mysterious figure who takes the place of the good and evil angels in the last scene of the play.
Which of the following does the atomic number of an atom represent? (1 point)
o the number of neutrons in the atom
O the number of particles outside the nucleus of the atom
O the number of protons in the atom
o the number of particles in the nucleus of the atom
Explanation:
the atomic number is the number of protons in the atom
How does getting funding from the government affect scientific research? A. The government helps the scientists decide what research is
important.
B. Scientists have to follow governmental rules made to protect
people.
C. The government tells the scientists what research they can do.
D. Scientists can only do research that helps the government protect
its citizens.
True or false
an astronomer studies the universe beyond Earth.
Answer:
More generally, astronomy studies everything that originates beyond Earth's atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole. Astronomy is one of the oldest natural sciences. The early civilizations in recorded history made methodical observations of the night sky.
Calculate with correct number of significant figures: 685.90 + 152.1 - 0.125
Answer:
837.9
Explanation:
A student titrated a solution containing 3.7066 g of an unknown Diprotic acid to the end point using 28.94 ml of 0.3021 M KOH solution. What is the molar mass of the unknown acid? Hint: you must write a balanced equation for the reaction.
Answer:
Molar mass of the diprotic acid is 424 grams
Explanation:
[hint: diprotic acid only contains 2 hydrogen protons]
Ionic equation:
[tex]{ \bf{2OH { }^{ - } _{(aq)} + 2H { }^{ + } _{(aq)}→ 2H _{2} O _{(l)} }}[/tex]
first, we get moles of potassium hydroxide in 28.94 ml :
[tex]{ \sf{1 \: l \: of \: KOH \: contains \: 0.3021 \: moles}} \\ { \sf{0.02894 \: l \: of \: KOH \: contain \: (0.02894 \times 0.3021) \: moles}} \\ { \underline{ = 0.008743 \: moles}}[/tex]
since mole ratio of diprotic acid : base is 2 : 2, moles are the same.
Therefore, moles of acid that reacted are 0.008743 moles.
[tex]{ \sf{0.008743 \: moles \: of \: acid \: weigh \: 3.7066 \: g}} \\ { \sf{1 \: mole \: of \: acid \: weighs \: ( \frac{1 \times 3.7066}{0.008743}) \: g }} \\ = { \underline{423.95 \: g \approx424 \: grams}}[/tex]
for the molar mass:
Evidence for the Big Bang Theory
Group of answer choices
The amount of Lead and Iron in the Universe
Discovery of the Cosmic Background Radiation
Stars are like fires from the explosion
Answer:
2nd one
Explanation:
Big bang echo other ones make no sense.
Explain why arginine is a basic amino acid
Answer:
There are three amino acids that have basic side chains at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). Their side chains contain nitrogen and resemble ammonia, which is a base. Their pKa's are high enough that they tend to bind protons, gaining a positive charge in the process.
Hope it helps you.Answer :
arginine is basic amino acid because it's side chain group contains a full positive charge at the physiological pH. Histidine is also considered basic but it can have a positive or a neutral charge on its side chain group at the physiological pH
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what we can seprate sand and iron flings
Answer:
Magnetic separation
Explanation:
Sand is non-magnetic whereas iron fillings can be used as magnets. So, they can be separated by a method which uses a magnet for separating a mixture. Magnetic separation is the process which uses magnetic force for the extraction of magnetic material from a mixture.
through magnet
although not writable answer but for gk even a blow of wind shall do
Density is defined as the mass of a substance divided by its volume, or D=M/V. Calculate the
volume of 119.9 grams of a substance that has a density of 0.8 g/mL
Answer: 149.9 ml
Explanation: Do as the formula suggests: D = M/V
0.8 g/ml = 119.9 grams/V
V = (119.9 grams)/(0.8 grams/ml) = 212.8 ml
Note how the grams cancel and the ml moves to the top.
Câu 15: Khử hỗn hợp X gồm CuO, FeO bằng khí CO sau một thời gian thu được 14,4 gam hỗn hợp rắn A (4 chất) và thoát ra 3,36 lít (đktc) khí B có tỷ khối so với H2 bằng 18. Hòa tan hoàn toàn A trong dung dịch H2SO4 đặc, nóng dư đến khi phản ứng kết thúc thu được 2,24 lít SO2 (đktc) và dung dịch B. a) Viết các phương trình phản ứng. b) Tính khối lượng mỗi oxit FeO, CuO trong hỗn hợp đầu. c) Cô cạn dung dịch B thu được bao nhiêu gam muối khan.
Answer:
Cô cạn dung dịch B thu được bao nhiêu gam muối khan.
Draw the structure 2,3dimethylhep-2-ol
Answer:
[tex]{ \sf{CH_{3}C - (CH_{3})(OH)CH(CH_{3})CH_{2} CH_{2} CH_{2}CH_{3}}}[/tex]
2. Which of the following is the reason that ionization energy generally increases from left to right across the first period of the periodic table?
(A) As the atomic number increases, the electrons are harder to remove.
(B) Ionization energy increases as the atomic number increases in a period.
(C) As the atomic number increases, more electrons are
added to the atoms, thus increasing the electron-electron repulsions.
(D) As the atomic number increases, more protons in the
nucleus cause an increase in the effective nuclear charge,
making it harder to remove the electrons.
Answer:
The correct answer is D
Explanation:
more protons in the nucleus cause an increase in effective nuclear charge ,
Please help me answer this question
Answer with explanation:
1) general word equation=acid + metal= salt + hydrogen gas
chemical/balanced equation= 2HCl+Mg=MgCl2+H2
2)The gas thus formed is an effervescent carbon di oxide when calcium chloride reacts with hydrochloric acid. the carbon di oxide gas also acts as an extinguisher for fires. Hence the burning candle is extinguished.