Answer:
Explanation:
A petrifying well is a well which gives objects a stone-like appearance. If an object is placed into such a well and left there for a period of months or years, the object acquires a stony exterior.
which need or want does this technology meet
Answer:
B. It allows people to rapidly heat items.
Explanation:
because it's a microwave...
Answer:
B. It allows people to rapidly heat items.
I am a bit skeptical about the radiation that allows microwaves to heat items so quickly though...
Explanation:
This is common sense, mate. Sorry to break it to you.
Why was there no reaction in some of the wells?
Is H2O+CO2 = H2CO3 a redox reaction? How?
Answer:
It is not an oxidation-reduction reaction. The formation of carbon dioxide and water are redox reactions which involve the oxidation of carbon and hydrogen respectively with oxygen being reduced in both the case.
Explanation:
This is not a redox reaction.
A redox reaction is the one that involves reduction and oxidation simultaneously. In a redox reaction, one of the substance gets oxidised and behaves as a reducing agent and the other gets reduced that behaves as an oxidizing agent.
The oxidation or reduction of the substance is decided by the change in oxidation number of the atom which is the charge that an atom appears to have on forming ionic bonds with other heteroatoms.
In this reaction, no change in oxidation state of the atoms takes place and thus this reaction is not a redox reaction.
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A gas starts at a volume of 23 L and a pressure of 1.23 atm. What is the new pressure if you
change the volume to 15 L?
Answer:
1.89 atmExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{1.23 \times 23}{15} = \frac{28.29}{15} \\ = 1.886[/tex]
We have the final answer as
1.89 atmHope this helps you
Which of the following are examples of being open to learning new things?
i. listening to different points of view
ii. listening to an argument, even if you disagree
iii. watching the local news to stay up-to-date
A.
i only
B.
ii only
C.
i and ii only
D.
i, ii, and iii
Please select the best answer from the choices provided
A
B
C
D
Mark this and return
Answer:
C
Explanation:
I would say different points of view and listening to an argument. The local news just to "stay up to date" won't teach you much.
Answer:
b
Explanation:
all of them shows different point of veiws. none of them are biest
In a chemical reaction, how do the reactants compare to the products?
Question 3 options:
A) They are different substances with different properties
B) They are the same
Answer:
A) They are different substances with different properties.
Explanation:
A chemical equation describes a chemical reaction. Reactants are starting materials and are written on the left-hand side of the equation. Products are the end result of the reaction and are written on the right-hand side of the equation.
So, A is correct.
(Also it said there were 3 options but only showed 2)
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How many phosphorus atoms are there in 1.75 mol of calcium phosphate,
Ca3(PO4)2
Answer:
It has 2 phosphorus atoms in 1 mol
so for 1.75 mol =2×1.75
Explanation:
need thanks and make me brainiest if it helps you
There will be two atoms of phosphorus in the 1.75 mol of calcium phosphate.
What are atoms?
Atoms are the smallest unit of matter. In a chemical reaction, the number of atoms shows the quantity of an element in the compound or reaction. Phosphorus is a chemical element that is preset in the periodic table.
In calcium phosphate, Ca3(PO4)2, the number of atoms can be calculated by counting the number of moles that is given in the equation.
The number of atoms of calcium is 3, and the number of phosphorus atoms is 2.
Now given the 1.75 mol of calcium phosphate, so the number of atoms of phosphorus will be the same in any number of moles of calcium phosphate. So there will be 2 atoms of phosphorus in the given equation.
Thus, the number of atoms is two.
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Electromagnetic energy that travels in transverse waves which produces visible light is
radiant
nuclear
sound
thermal
How many moles are required to react with 4.5 moles of H2?
N2 + 3 H2 ------> 2 NH3
Answer:
1.5 mol
Explanation:
Given data:
Number of moles of H₂ = 4.5 mol
Number of moles of N₂ = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Now we will compare the moles of hydrogen and nitrogen.
H₂ : N₂
3 : 1
4.5 : 1/3×4.5 = 1.5 mol
Thus, 1.5 moles of nitrogen are required to react with hydrogen.
Please help!!! I don’t know
Answer:
4.06×10^23
Explanation:
1 mole has 6.023×10^23 molecules
0.675 moles have (6.023×10^23×0.675) molecules
What substance, if added to the mixture of salt and sand, could be separated from the mixture using a sieve
O sugar
O iron filings
O flour
O plastic beads
write word equation of carbon + oxygen ---> carbon dioxide
Answer:
Carbon + Oxygen = Carbon Dioxide
Explanation:
You already did
Is Aushtin dating Summer please help
Answer:
uhm yes he made her pump go off
Explanation:
what is a covalent bond?
Answer:
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Explanation:
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describe the motion of the particals in liquid bromine and bromine gas
The motion of particle of bromine in liquid is less as compared to the gaseous phase.
What is Entropy?Entropy is defined as the motion of particle how randomly a particle move.
Entropy is also defined as the no. of particle per unit surface area.
In liquid phase, the number of particle per unit surface area is greater. The particle are closer with each other through the intermolecular force of attraction. Due to which randomness of particle decreases. Hence motion of particles decreases.
In gaseous phase, the number of particle per unit surface area is lesser. The particle are less closer with each other and have less intermolecular force of attraction. Due to which randomness of particle increases. Hence, motion of particles increases.
Thus, we concluded that the motion of particle of bromine in liquid is less as compared to the gaseous phase.
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Which elements from the periodic table are the least reactive?
A noble gases
B transition metals
C lanthanides
Dmetalloids
Answer:
Noble games are the least reactive because their outer shells are already full with 8 electrons.
13. For a gas to become a liquid, large numbers of particles must clump
together. Particles clump together when the attraction between them
overcomes their
Answer: For a gas to become a liquid, large numbers of particles must clump together. Particles will clump together when the attraction between them overcomes their motion. For this to happen, energy must be removed from the gas to slow the particles down. So, condensation is an exothermic change.
the atomic masses of 63 cu (69.17 percent) and 65 cu (30.83 percent) are 62.94 and 64.93 amu, respectively. calculate the average atomic mass of copper. the percentages denote the relative abundances
Answer:
The average atomic mass of copper is 63.55 amu.
Explanation:
hope this help
A solution is classified as a weak base. Which of these could be the pH of the solution?
A)2
B)6
C)10
D)13
C
Pure water is at 7, and the bases are above 7 and the acids are below 7.
The pH of the solution that is classified as a weak base is 10. Details about weak bases can be found below.
What is pH?pH of a solution refers to the degree of acidity or alkalinity of that solution.
The pH scale reads from 1 - 14 where the following applies:
1 - 6 represents acidic solution7 represents neutral8 - 14 represents alkaline solutionA weak base will have a pH close to neutral, therefore, the pH of the solution that is classified as a weak base is 10.
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(HURRY 4. Which state of matter has a definite volume, but not a definite shape?
Liquid
solid
vapor
gas
Answer:
liquid
Explanation:
liquids can change shape based on what container they are in but they have a definite volume
Answer:
Liquid
Explanation:
When 3.5 moles of sodium oxide react, how many moles of sodium hydroxide will be produced?
moles NaOH *Report your answer to the
correct number of significant digits!
Na2O + H2O -> 2 NaOH
Answer:
7 moles of NaOH will produced.
Explanation:
Given data:
Number of moles of sodium oxide = 3.5 mol
Number of moles of sodium hydroxide produced = ?
Solution:
Chemical equation:
Na₂O + H₂O → 2NaOH
Now we will compare the moles of sodium oxide with sodium hydroxide.
Na₂O : NaOH
1 : 2
3.5 : 2/1×3.5 = 7
7 moles of NaOH will produced.
The metallic character of an element is determined by how readily it loses electrons. Elements that lose electrons most easily have the greatest metallic character. Which group has the greatest metallic character?
Answer:
Group 1 metals or the alkali metals
Explanation:
The group 1 elements are all metals except for hydrogen, the first element in the group. Group 1 metals have one valence electron in their outermost shell. The metallic character increases as one goes down the group.
The metallic character of an element is determined by how readily it loses electrons. Elements that lose electrons most easily have the greatest metallic character. Group 1 metals have the greatest metallic character due to the ease with which they donate or lose their one valence electron. As the atomic radius increases on going down the group, their metallic character increases. Also, due to screening effect of the inner electrons on the valence electron from the positive nuclear charge of the nucleus, metallic property increases on going down the group.
Please solve for Cu,N,and O an dif you can show how cause ik confused
Cu⇒ 1 atom
N⇒2 atoms
O⇒6 atoms
Total 9 atoms
Further explanationThe empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
Chemical formula : Cu(NO₃)₂
Number of Cu : 1
Number of N : 2
Number of O = 2 x 3 = 6
Total atoms in Cu(NO₃)₂ : 1 + 2 + 6 = 9
what is a polar zone
Answer:
polar zone - the part of the Earth's surface forming a cap over a pole; characterized by frigid climate. Frigid Zone, polar region. climatic zone - any of the geographical zones loosely divided according to prevailing climate and latitude.
Explanation:
The polar regions, also called the frigid zones, of Earth are the regions of the planet that surround its geographical poles, lying within the polar circles.
I have 1.8066 x 1024 atoms of Calcium, how many grams of calcium do I have?
Answer: 1849.9584
Explanation:
As the effective
nuclear charge is increased with the same amount of electron shielding,
A The valence electrons have a more negative potential energy, decreasing the amount of energy
required to remove them
B The valence electrons have a less negative potential energy, decreasing the amount of energy
required to remove them
c The valence electrons have a more negative potential energy, increasing the amount of energy
required to remove them
D The valence electrons have a less negative potential energy, increasing the amount of energy
required to remove them
What is the pressure of 1.50 moles of a gas in a 30.0L tank at a temperature of
285K?
The pressure of the gas : 1.1685 atm
Further explanationIn general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
n=moles=1.5
V=volumes = 30 L
T=temperature=285 K
The pressure :
[tex]\tt P=\dfrac{nRT}{V}\\\\n=\dfrac{1.5\times 0.082\times 285}{30}\\\\P=1.1685~atm[/tex]
is the scientific method is the end result of the scientific process?
Answer:
The right response will be "No".
Explanation:
Again after findings being collected, this same scientific method does not stop. The phase of the experience seems to be the compilation, examination, interpretation as well as the integration of information. The reasoning underneath research methodology has been the methodology which includes making the significance of the findings developers measured.Except for the noble gases, nonmetals tend to have high electron affinities. What properties of nonmetals do you think are the result of this tendency?
Answer:
Nonmetals are further to the right on the periodic table, and have high ionization energies and high electron affinities, so they gain electrons relatively easily, and lose them with difficulty.
Explanation:
They also have a larger number of valence electrons, and are already close to having a complete octet of eight electrons.
Periodic table is divided as metals, non metals, noble gases and semiconductors. Among these nonmetals tend to have high electron affinities because of small size and high effective nuclear charge.
What are non metals?Non metals are the element that have property to gain electron. When any element gain electron then element attain negative charge and that element is called anion.
As we go from left to right in periodic table, the size of element decreases as number of electrons keep on adding electrons in the same shell . As the number of electrons increases, the number of proton in the nucleus also increases. Due to this, the hold of nucleus on the outermost proton increases and the size decreases. Due to this, the ionization energy increases and hence the power to gain electron increases.
Therefore, nonmetals tend to have high electron affinities because of small size and high effective nuclear charge.
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What letters in the middle of an element card represent?
How can you predict which element an atom is based on one of the two subatomic particles in the nucleus?
Which two of the three subatomic particles have an effect on the mass of an atom?
Answer:
I think it's the second answer