Answer:
9.18 L
Explanation:
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. 2Al(s)+6HCl(aq)⟶2AlCl3(aq)+3H2(g) What volume of H2(g) is produced when 7.40 g Al(s) reacts at STP?
first write, then balance the equation
Al + HCl-------------> AlCl3 + H2
2Al + 6HCl-----------> 2AlCl3 + 3H2 2 MOLE
2 moles of Al produce 3 moles of H2
Al is 7.4/27 =
0.27 moles of Al.
this will produce
0.27 X 3/2 moles of H2 =
0.41 moles of H2
PV =nRT
for STP, P = 1 atm, T = 273.2, R IS 0.082
V= (0.41) X 0.082 X 273,2/1 = 9.18 L
CHECK 1 mole of gas at STP has a volume of 22.4 L
0.41 moles then has a volume of 00.41 X 22.4L = 9.,18 L
potassium, k, has 19 protons, 20 neutrons, and 19 electrons. what is the charge of the atom’s nucleus?
from the 19 protons
Answer:
+19
Explanation:
potassium, k, has 19 protons, 20 neutrons, and 19 electrons. what is the charge of the atom’s nucleus?
since only neutrons and protons are in the nucleus, the overall charge in the nucleus is +19 from the 19 protons
An electrolyte can be checked to ensure that it has correct chemical composition by measuring its _____.
Answer:
specific gravity
Explanation:
help asap for brainlist
How will you convert 3.45 Kilometers to meter. Choose from the following options.
Question options:
Move the decimal in 3.45 TWO places to the right to increase the value.
Move the decimal in 3.45 TWO places to the left to decrease the value.
Move the decimal in 3.45 THREE places to the right to increase the value.
Move the decimal in 3.45 TWO places to the right to decrease the value.
Answer:
Move the decimal in 3.45 THREE places to the right to increase the value.
Explanation:
3.45km = 3450m (multiply by 1000)
Answer:
3rd option is the correct answer
Hope this helps!
An electron domain consists of ________. a) a nonbonding pair of electrons b) a single bond c) a multiple bond
An electron domain consists of ; All of the above options i.e. a ) nonbonding pair of electrons b) a single bond c) a multiple bond.
An Electron domain is the number of bonded locations ( lone pair or bonded ) found around an atom. and the bond location is independent of the type of bonding existing between atoms in a molecule.
Electron domain are also known as electron groups. the types of electron domain are ; nonbonding pair of electrons and bonded atom.
Hence we can conclude that An electron domain consists of ; nonbonding pair of electrons, a single bond and a multiple bond.
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During the electrolysis of fused MgO, how much magnesium can be produced from a charge of 3.00 Faradays
The mass of magnesium, Mg that can be produced from the electrolysis of MgO using 3 faradays is 36 g
In the electrolyte, we have
Mg²⁺ + 2e —> MgRecall:
1 electron = 1 Faraday
1 mole of Mg = 24 g
From the balanced equation above,
2 Faradays produced 24 g of Mg.
With the above information, we can obtain the mass of magnesium, Mg that will be produced by using 3 faradays. This can be obtained as follow:
From the balanced equation above,
2 Faradays produced 24 g of Mg
Therefore,
3 Faradays will produce = (3 × 24) / 2 = 36 g of Mg
Thus, the mass of Mg obtained by using 3 faradays is 36 g
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11. Start level 3 of the balancing equation game. Take turns and write down the equations as you solve them, along with any new strategies you needed for balancing.
CHALLENGE QUESTIONS: BALANCE THE EQUATIONS BELOW.
A. ___ NaNO3 + ___ PbO ___ Pb(NO3)2 + ___ Na2O
B. ___ Ca3P2 + ___ H2O ___Ca(OH)2 + ___ PH3
C. ___Fe2O3 + ___ CO ___Fe + ___ CO2
D. ___NH3 + ___ O2 ___ NO2 + ___ H2O
E. ___FeS + ___O2 ___Fe2O3 + ___SO2
F. ___ C3H6O2 + ___ O2 ___ CO2 + ___ H2O
In balancing reaction equations, The number of atoms of each element on both sides of the reaction equation must be the same.
The major rule that guides the balancing of chemical reaction equations is that the total number of atoms of each element on the right hand side of reaction equation is equal to the total number of atoms of the same element on the left hand side of the reaction equation. For each of the equations shown;
2NaNO3 + PbO -------> Pb(NO3)2 + Na2OCa3P2 + 6H2O→ 3Ca(OH)2 + 2PH3Fe2O3 + 3CO ------> 2Fe + 3CO24NH3 + 7O2 ------> 4NO2 + 6H2O4FeS + 7O2 -----> 2Fe2O3 + 4SO22C3H6O2 + 7O2 -----> 6CO2 +6H2OLearn more: https://brainly.com/question/8646601
what is the stage that all stars in our galaxy go through
Answer:
Heavy stars turn into supernovae, neutron stars and black holes whereas average stars like the sun end life as a white dwarf surrounded by a disappearing planetary nebula. All stars, however, follow roughly the same basic seven-stage life cycle, starting as a gas cloud and ending as a star remnant.
Which number is NOT a perfect square?
25
8
4
1
Answer:
8
Explanation:
when a gas undergoes an isothermal process, there is
Answer:
no change in the temperature of the gas.
Explanation:
isothermal process of a gas, can result to compression of the gas or expansion of the gas at a constant temperature (ΔT = 0).
For isothermal gas expansion, work is done in reducing the pressure of the gas by increasing its volume at a constant temperature. The change in the internal energy of this process is zero (ΔU = 0).
For isothermal gas compression, work is done in decreasing the volume of the gas by increasing its pressure at a constant temperature. The change in the internal energy of this process is also zero (ΔU = 0).
Therefore, when a gas undergoes an isothermal process, there is no change in the temperature of the gas.
What element does hydrogen on in ?
- metals
- non metals
- metalloids
Answer:
non-metal
Explanation:
hydrogen is gas
this chart may also help :)
hydrogen is all the first element all the way to the left with the letter H
PLEASE HELP
Select the statements that are correct regarding this reaction.
This is a fusion process.
This is a fission process.
The mass of the products is exactly equal to the reactants.
Only the number of particles of product equals the number of particles of reactants.
Could be more than one answer
Answer:
This is a fusion process.
This is a fission process.
Explanation:
Select the statements that are correct regarding this reaction.
This is a fusion process.
This is a fission process.
The mass of the products is exactly equal to the reactants.
Only the number of particles of product equals the number of particles of reactants.
Could be more than one answer
Hydrogen 1 + Lithium 7 yields 2 Helium 4 plus energy
you have merged hydrogen 1 with Lithium 7 to produce a temporary berylium8, so it is fusion, because you are fusing the particles together.
the energy of the impact of the hydrogen on the lithium
causes the temporary berylium 8 to split into 2 helium atoms, so it is then fission, because you are splitting an atom of berylium8.
the mass of the reactants and products are not equal, because some of the energy comes from conversion of the reactant mass to energy by E=mcc
The number of reactant particles does equal the number of product particles, bute answer says ONLY which is not correct
In the given reaction, The mass of the products is exactly equal to the reactants. However this a radioactive process where, lithium and hydrogen react together forming two helium nuclei.
What is mass conservation?According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the total mass of a system is conserved. In a closed system the mass cannot be lost.
For a chemical reaction, new products are formed by regrouping of atoms from the reactants where no new atom is produced not any lost. Hence, the total mass in the reactant side will be equal to the total mass in the product side.
In the given reaction the number of particles are equal in both side as well mass too equal in both side. The total mass in reactant side and product side is 8.
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Your classmate says that the farther the two atoms are apart in a bond, the larger the dipole moment will be. Is your classmate correct
Answer:
The answer is Yes
Explanation:
I jus got it right no cap
Your classmate says that the farther the two atoms are apart in a bond, the larger the dipole moment will be, this statement is correct.
What is bond ?An enduring attraction between atoms or ions known as a chemical bond is what allows molecules and crystals to form. The bond may be created by the sharing of electrons in covalent bonds or by the electrostatic attraction of two oppositely charged ions, as in ionic bonds.
Chemical bonds are formed when the atoms in a compound's molecule are brought together and kept together by a powerful combining force. Ionic and covalent bonds are the two different kinds of chemical bonding.
Atoms trade or exchange valence electrons to create bonds. The electrons at an atom's outermost energy level, known as valence electrons, have the potential to interact chemically. All chemical bonds are built on valence electrons.
Thus, the farther the two atoms are apart in a bond, the larger the dipole moment will be, this statement is correct.
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How can you increase the strength of the magnetic force on an object like a paper clip?
Answer:
"Iron bar magnets Fill a bowl or pan with some water. Find something that will float on the water. Lay the magnet on top of this object. The magnet will twirl in the water until it comes to rest pointing exactly north and south due to the magnetic force of the North Pole."-- science.howstuffworks.com. Or you could just increase the surface area.
Explanation:
The strength of the magnet force is maximum at the poles and minimum at the centre. A magnet can exerts a magnetic force on the other magnets as well. Here by using the soft iron bar as the magnet, the strength of the magnetic force on an object can be increased.
A magnetic force is defined as the force that a magnet exerts on certain materials like iron, steel, nickel, etc. This type of force is a non-contact force because it can act from a distance.
By using iron bar magnet or by increasing the numbers of turns of the coil can pick up more paper clips.
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I need help with this
Answer:
26.00 units of Volume.....
How you can minimize human impact on the environment?
23.45g Cu(0H)2 x 1 mol Cu(0H)2 x 6,022 x 1023 mol Cu(0H) =
__g Cu(0H)2 1 mol Cu(0H)2
= ____molecules Cu(0H2)
please help
Answer:
I help u after my online class and intervieww
tron 500ml dung dich NAOH 0,1M voi 500ml dung dich HCL 0,12M tinh ph dung dich saun phan ung
Answer:
Explanation:
"Khối lượng NaOH rắn cần dùng để pha 500mL dung dịch NaOH 0,1M là bao nhiêu?" Để tạo ra dung dịch chứa một mol NaOH, cần hòa tan 40 gam NaOH trong 500mL H2O.
How many mL in 5.867 L?
Answer:
5867ml is the answer to 5.867L to ml
Which of the following is in French
The floor is pink
A dog barks
A cup with steam coming from it will be hot to touch
Answer:
A dog barks
Explanation:
Why is blood so essential for cell function to occur?
Explanation:
Blood Provides the Body's Cells with Oxygen and Removes Carbon Dioxide. Blood absorbs oxygen from air in the lungs. It transports the oxygen to cells throughout the body, and it removes waste carbon dioxide from the cells.
Your blood carries oxygen and nutrients to all of the cells in your body. Blood cells also fight infection and control bleeding.
2. Pick two materials that float from the table above.
Observe how high the two materials float in the water and compare this to the density of the two objects.
What do you notice?
An object with a lower density will float
than an object with a higher density.
(higher/lower)
Explanation:
so let's say fertilizer sinks it would be higher density and like salt it would be a solvent hope that helps honestly it probably did not but kind of a guide I guess and another one is ice it will be like a toy and here's a tip water is and always will be 1 gl
True/False: Polycrystalline materials have many mis-oriented crystalline grains in their microstructure because the phase transformations used to create these materials (e.g., solidification) occur via a nucleation and growth process.
The statement 'polycrystalline materials have misoriented crystalline grains because phase transformations occur via a nucleation and growth process' is TRUE. Polycrystalline materials consist of many crystallites.
Polycrystalline materials are solid materials consisting of many crystallites, which vary in both size and orientation.
Polycrystalline materials include, among others, rocks, ice, metals, ceramics, etc.
Nucleation refers to the chemical process by which solid crystals form from a liquid.
In the solidification of polycrystalline materials via nucleation, molecules are first arranged in a particular pattern form which additional particles can be added as the crystal grows.
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If you wanted to find a type of atom in your little finger that has been in its present form (been the same element) since the beginning of the universe, which element should you look for
An atom that has been present in the little finger and has been in its present form since the beginning of the universe is the element calcium.
The human body, just like every other thing in the universe is composed of atoms. An atom is the smallest particle of a substance that can take part in a chemical reaction.
An atom that has been present in the little finger and has been in its present form since the beginning of the universe is the element calcium. Calcium is found in abundance in human extremities.
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Number of
Protons
Number of
Neutrons
Atomic
Number
Mass
Number
Element
(symbol)
А
7
B.
15
с
D
E
26
56
F.
Using the periodic table, complete the table to describe each atom. Type in your answers.
A
B
с
N
D
What is the ability of a substance to change into something else?
Answer:
chemical synthesis or chemical property
Explanation:
Gina has brown eyes. Her mother also has brown eyes, but her father has blue eyes. Most of the people in Gina's town have brown eyes.
Gina most likely inherited brown eyes from _______.
A.
her mother
B.
no one
C.
her father
D.
the townspeople
Answer:
anser is A
Explanation:
the mother genes are always stronger than the dads
Answer:
A
Explanation:
4. The octet rule is a rule that governs bond formation. It states that -
a. elements can only gain 8 electrons
b. all elements lose 8 electrons
c.all elements will gain, lose or share electrons in order to obtain 8
electrons in their outer energy level
d. all elements share 8 electrons
The pressure of a gas at 35.6oC is 114.3kPa. What is the pressure when the temperature drops to 17.3oC? Assume constant volume.
Answer:
107.5252955kPa or 108kPa
Explanation:
Use Gay Lussac's Law, P1/T1 = P2/T2
Manipulate the equation: P2 = P1*T2/T1
Change C to K: 35.6C = 308.75K and 17.3 = 290.45K
Input the values: P2 = (114.3kPa)(290.45K)/308.75K
P2= 107.5252955kPa
You probably want to round to 3 sig figs, so 108kPa
Make a list of some other common mixtures. Stating what they are mixtures of.
lemon juice
fry rice
biryani
lassi
slime etc
Which statements best describe displacement? Check all that apply.
1.Displacement is measured along the path an object travels.
2.Displacement is a measurement that includes direction.
3.Displacement is the difference between a starting point and an ending point.
4.Displacement is how far an object travels from starting point to ending point.
5.Displacement is measured as a straight line between a starting point and an ending point.
Answer: The answer is B, C, and E.
Explanation:
Pls, mark me brainliest.
Displacement can be defined as the difference between a starting point and an ending point. Displacement is a measurement that includes direction and is measured as a straight line between a starting point and an ending point. Therefore, option (2), (3), and (5) are correct.
What is displacement?The displacement of an object can be described as the change in the position of an object. The displacement is the minimum length between the initial and the final point.
The displacement is the vector quantity posses both distance and magnitude. Therefore, the measurement of the displacement includes direction.
Displacement can also be described as the difference between a starting point and an ending point. Displacement can be measured as a straight line between a starting point and an ending point.
The S.I. unit of the displacement is the same as the distance i.e. meters and the C.G.S. unit are centimeters.
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