Answer:
True
Explanation:
All irreversible reactions go to completion because the process cannot proceed in the backward direction.
A reversible reaction is one that does not go into completion in one direction.
An irreversible direction completely uses up the reactants to form the products and goes into completion.
These reactions can only proceed in one direction and not both.
the highest level of organization is
.Answer:
.Marie Kondo
Answer:
Federal Government
Explanation:
:)))))))))
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What do these two changes have in common?
your breath becoming visible on a cold day
ice crystals forming on a window
Select all that apply.
Both are only physical changes,
Both conserve mass,
Both are changes of state,
Both are chemical changes,
Answer: is B and C
Explanation:
The two changes have in common is both conserve mass and both are changes of state.
What are changes?Changes are defined as changes occur when bonds between molecules or atoms are disrupted or established.
It means that one material having a specific set of attributes is converted into another substance with other properties.
There are basically two types of changes.
Physical change - It is defined as a type of transformation in which the form of matter changes but no substance is converted into another.Chemical change - It is defined as a transformation of one material into another, the formation of new materials with distinct properties, and the formation of one or more new substancesThus, the two changes have in common is both conserve mass and both are changes of state.
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Could someone help me with this?
Answer: sorry wish o could help
Explanation:
How many grams are in 7.23 x 10^24 Al atoms?
Answer:
323.76 g
Explanation:
The number of grams of the given atoms of Aluminum is 323.73 grams.
The given parameters:
Atom of the Aluminum, = 7.23 x 10²⁴The number of grams of the given atoms of Aluminum is calculated as follows;
6.02 x 10²³ atoms of Aluminum = 27 grams7.23 x 10²⁴ atoms of Aluminum = ?[tex]= \frac{7.23 \times 10^{24} \times 27 \ g}{6.02 \times 10^{23}} \\\\= 323.73 \ g[/tex]
Thus, the number of grams of the given atoms of Aluminum is 323.73 grams.
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How many grams of lead would be required to make 119 grams of water
Answer:
684
Explanation:
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 684 g of lead would be required to make 119 grams of water.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
The balanced equation for the given reaction can be written as below
Pb + PbO[tex]_2[/tex] + 2H[tex]_2[/tex]SO[tex]_4[/tex] [tex]\rightarrow[/tex]2PbSO[tex]_4[/tex] + 2H[tex]_2[/tex]O
Mathematically,
The mole ratio between lead and water is 1:2
(119 g H2O) / (18.01532 g H2O/mol) x (1 mol Pb / 2 mol H2O) x (207.21 g Pb/mol) = 684 g Pb
The mass of lead comes out to be 684 g.
Therefore, 684 g of lead would be required to make 119 grams of water.
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Why do we dream? Help me Please;)
Answer:
Explanation:
we dream because when our bodies are taking memories into long term, the memories from that day or the day before collide and make dreams. that is why they resemble things that have happened to us.
Answer:
One widely held theory about the purpose of dreams is that they help you store important memories and things you've learned, get rid of unimportant memories, and sort through complicated thoughts and feelings. Research shows that sleep helps store memories.
The brain is so active when we dream that it is virtually indistinguishable from a brain in the waking state. Even so, the chemistry of it is entirely rewired when we sleep. Many scientists attribute this to the reason dreams are so strange and bizarre.
Explanation:
A solution is a mixture _____.
that has the same properties throughout
from which the solute can be filtered
that is heterogeneous
in which a solid solute is always dissolved in a liquid solvent
Answer:
homogeneous
Explanation:
PLEASE HELP!! 50 POINTS FOR ONE MULTIPLE CHOICE QUESTION!!!!!!!!!!!!!!!
Answer:
it is B
Explanation:
What is the only thing that changes in a chemical reaction
how many phosphorus atoms are represented in the formula?
Answer:
i believe 4
Explanation:
hope this helps :)
Answer:
= 8 atoms
Explanation:
3 atoms of Sr + 2 atoms of P + 8 atoms of O = 13 atoms total are present.
Match the following molecules with the number of atoms they contain.
1. 2Fe two
2. 2Al3O2 seven
3. 4O2 five
4. 5C ten
5. H2SO4 eight
ANWER ASAP PLEASSEEEE
a 15 L tank of gas has a pressure of 8.20*10^4 and the new pressure is 7.00*10^4 what is the new volume
Answer:
V₂ =17.57 L
Explanation:
Given data:
Initial volume = 15 L
Initial pressure = 8.20×10⁴ atm
Final pressure = 7.00×10⁴ atm
New volume = ?
Solution:
The given problem will be solved through the Boly'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
8.20×10⁴ atm × 15 L = 7.00×10⁴ atm × V₂
V₂ =123×10⁴ atm. L/7.00×10⁴ atm
V₂ = 17.57 L
Pls help 7th grade science
Answer:
It would be the first one, an overall positive charge on one end and overall negative charge on the other end.
Explanation:
Answer:
It's A.) A molecule that has an overall positive change in one end and an overall negative charge on the other
Explanation:
The definition of a polar molecule is a molecule with a negatively charged end and a positively charged end.
Another term for group B element
Answer:
transition metals
Explanation:
What do scientists do?
O A. They make ethical decisions for the government.
B. They use their knowledge to make public policy.
O C. They learn about the world through observation.
O D. They make sure all facts fit scientific theories.
SUMIT
What gases make up the composition of the atmosphere?
Answer:
Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.
Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.
Answer:
The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
Explanation:
The mass of a single uranium atom is 4.70x10^-22 grams. How many uranium atoms would there be in 111 milligrams of uranium?
2.4 x 10²² atoms
Further explanationAtomic mass is the average atomic mass of all its isotopes
In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu
So the atomic mass obtained is the mass of the atom relative to the 12th carbon atom
mass single Uranium atom=4.7 x 10⁻²² g
then for 111 mg=0.111 g
[tex]\tt \dfrac{0.111}{4.7\times 10^{-22}}=2.4\times 10^{22}[/tex]
what is the difference between polar and ionic? for instance in substances such as vinegar and water.
Write a balanced chemical equation for the following: magnesium metal is burned in oxygen to produce magnesium oxide.
Answer:
2Mg (s) + [tex]O_{2}[/tex] (g) ---> 2MgO (s)
Explanation:
Which group reacts with water to form hydrogen
Answer: The answer is the alkali metals group! Hope this helps!
Explanation:
The halogens are considered a ____.
a. period
b. group
c. both
d. neither
Answer:
both.......
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Iron
Electron Configuration
Answer:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶
Explanation:
Electronic configuration:
Fe₂₃ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶
Abbreviated electronic configuration:
Fe₂₃ = [Ar] 3d⁶4s²
Properties of iron:
Iron is soft, bright white metal.
Its symbol is Fe, atomic number is 26 and atomic mass is 55.85 amu.
It is present in group 8 of periodic table.
It is used to make the steel.
It is malleable and ductile used to make the sheets.
It is good conductor of heat and electricity because of moveable electrons that can easily move from one to another atom.
Its density is 7.87 g/cm³.
Fill in the coefficients that will balance the following reaction:
(Note: Use 1 as coefficient where appropriate.)
_C3H7OH + _O2 → _CO2 + _H2O
How much energy is in a gamma ray with a frequency of 3.0 x 1020 Hz? answer choices>
O 1.97 x 10 (13)
0 2.21 x 10 (-54)
0 4.52 x 10 (53)
1.98 x 10 (-13)
Answer:
pretty sure it's the second option, sorry if I'm wrong..
Explanation:
Earth and Jupiter are shown next to each other. Earth is much smaller than Jupiter. Why is Jupiter so much larger than Earth? Check all that apply. 1. Inner planets were created at higher velocities. 2. Outer planets have less gravity than inner ones. 3. Outer planets attracted helium, hydrogen, and other gasses. 4. Inner planets formed where temperatures were cooler. 5. Gases escaped from inner planets and not from outer ones.
Answer:
3 and 5
Explanation: i hope that helped
Answer:
1,3,5
Explanation:
Select the correct formula for the polyatomic ion.
The formula for the ammonium ion:
NH3
NH4+
AM+
Answer:
B (NH4+)
For the next one (nitrate ion) it's A (NO3-)
For the last (chromate ion...) it's C (CrO4^2-)
Explanation:
For edge:)
The ammonium ion (NH₄+) is a positively charged polyatomic ion. Therefore option 1 is correct.
The ammonium ion (NH₄+) is a positively charged polyatomic ion that consists of one nitrogen atom (N) bonded to four hydrogen atoms (H). The hydrogen atoms are bonded to the nitrogen atom through covalent bonds.
The formula NH₃, on the other hand, represents ammonia, which is a neutral molecule consisting of one nitrogen atom and three hydrogen atoms. Ammonia does not carry a charge and is not considered a polyatomic ion.
The formula AM+ is not a recognized chemical formula or symbol and does not correspond to any known ion or molecule.
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write any two properties of matter
Answer:
It can't be broken and it can be moved
Explanation:
Answer:
Liquid and solid
Explanation:
I need help asap :( Its worth 60 points!!!!!!
20 grams of hydrogen reacted with oxygen to form 36 grams of H20 (water). How many grams of oxygen were used up in this reaction?
Answer:
Mass of oxygen react = 32 g
Explanation:
Given data:
Mass of hydrogen = 20 g
Mass of oxygen = ?
Mass of water formed = 36 g
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Number of moles of water formed:
Number of moles = mass/molar mass
Number of moles = 36 g/ 18 g/mol
Number of moles = 2 mol
No we will compare the moles of water with oxygen.
H₂O : O₂
2 : 1
when two moles of water formed one mole of oxygen react.
Mass of oxygen react:
Mass = number of moles × molar mass
Mass = 1 mol × 32 g/mol
Mass = 32 g
True or false: plants, animals, and the environment are not dependent on each other for the use of carbon and oxygen.
please help!! thank you!!
Answer:
d
Explanation:
