Answer:
A
Explanation:
The more time given for the water to drip, the more droplets fall, which increase the volume of the water
Hope this helps! Good luck :)
How many moles are in 3.75 × 10^23 F atoms?
Answer in units of mol.
Answer:
The answer is 0.62 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.75 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.75}{6.02} \\ = 0.6229235...[/tex]
We have the final answer as
0.62 molesHope this helps you
In Bohr's model, electrons exist in orbits around the nucleus
which only exist at fixed distances from the nucleus called?
Answer:
They are called energy levels.
Explanation:
Can someone help me please, I think it may be B but i'm not sure..
Answer:
The Answer is D
Explanation:
Write formula for:nickel (V) sulfate
Answer:
NiSO4
Explanation:
Sulphur has got 2 valence electrons that it gains and on the exchange of the valence electrons with Nickel, which provides a number of valence electrons that cancels easily with those of sulphur, the we shall have the remainder of four electrons at the the bass of the formula
Water dissolves ionic compounds because water molecules
a. Are nonpolar.
b. Have a pH value of 14 or greater.
c. Have partially charged ends.
d. Do not contain atoms.
Water is known as the universal solvent because it can dissolve almost all ionic compounds due to its polarity that is having partially charged ends.
What is polarity?A polar compound is having the partially charged ends, where the shared pair of electrons are attracted towards the more electronegative atom, and thus have partial charges on both atoms.
In water, the shared pair of electrons are pulled towards the electronegative oxygen atom and thus O acquires a negative charge and H gets a positive charge. These charged ends are active to attack other reagents and forms hydrogen bonds with other electronegative atoms of ionic bond.
In this way water bonds to the ionic compounds and gets them easily dissolved. Hence, option C i.e., have partially charged end is correct.
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what is the concentration of a solution if it has 25g of salt dissolved in 400 ml of water?
Answer:
Solubility ≡ 62.5 ⋅ g ⋅ 100 ⋅ m L − 1
Explanation: We want Concentration = Mass of solute 100 mL volume of solvent .
We make the reasonable assumption that the volume of solution is equal to 40 ⋅ m L
Explanation:
Answer:
62,5 g/l
Explanation:
Concentration = m(NaCl) / V(H2O)
Firstly, we change ml to l, so 400 ml becomes 0,4 l.
Divide 25 by 0,4 and you get 62,5 g/l.
I have to put them in order ! Please answer ASAP!
Answer:
the tops ones will be animal and plants
under cells it will be nucleus
the genes
the last three will be eye color, height, and type of fruit
An air bubble in a bar of ivory soap at room temperature (23 °C) has a
volume of 0.80 mL. What volume does the air bubble have when it is
heated in a microwave to 88 °C? *
Answer:
V2 = 0.98mL
Explanation:
Using Charles' law equation which I as follows:
V1/T1 = V2/T2
Where;
V1 = initial volume (mL)
T1 = initial temperature (K)
V2 = final volume (mL)
T2 = final temperature (K)
Based on the information provided in this question; V1 = 0.80 mL, V2 = ?, T1 = 23°C, T2 = 88°C
Temperature in °C must be converted to Kelvin
T1 (K) = 23°C + 273 = 296K
T2 (K) = 88°C + 273 = 361K
Hence, using V1/T1 = V2/T2
0.80/296 = V2/361
296 × V2 = 0.80 × 361
296V2 = 288.8
V2 = 288.8/296
V2 = 0.9756
V2 = 0.98mL
An initially deflated and flat balloon is connected by a valve to a storage tank containing helium gas at 1 MPa at ambient temperature of 20 degrees C. The valve is open and the balloon is inflated at constant pressure of 100 kPa (atmospheric pressure) until it becomes spherical at D1 = 1m. If the balloon is larger than this, the balloon material is stretched giving a pressure inside as:
P = Po + C(1-(D1/D))(D1/D)
The balloon is slowly inflated to a final diameter of 4m, at which point the pressure inside is 400 kPa. The temperature remains constant at 20 degrees C. Determine the work done during the overall process.
Answer:
14660.75 kJ.
Explanation:
We are given from the question above that the pressure inside is represented by this equation:
P = Po + C(1-(D1/D))(D1/D).
Thus, P = 100 + C (1 - 1/4) (1/4). Therefore, P which is = 400 is;
400 = 100 + C (1 - 1/4) (1/4).
Hence, C = 1600. And the equation can be written as P = 100 + 1600 (1 - (D1/D))(D1/D).
The work done during the entire process, w = (work done during the process 1 to 2) + (work done duringbthe process 2 to 3 ).
Therefore, work done during the process 1 to 2 = P(V2 + V1) = 100( π/6 - 0).
{NB: V2 is gotten from π/6 × D^3. Where D^3 = 1. }
Hence, work done during the process 1 to 2 = 52.36 kJ.
So, the work done duringbthe process 2 to 3 ) is going to be the integration of PdV. Where P = 100 + 1600 (1 - (D1/D))(D1/D) and dV = π/2 D^2 dD. Taking the upper and the lower limit as 4 and 1 respectively.
After the integration (kindly check attached picture for the process) the work done duringbthe process 2 to 3 = 14.61 × 10^3 kJ.
Therefore, The work done during the entire process, w = (work done during the process 1 to 2) + (work done duringbthe process 2 to 3 ).
The work done during the entire process, w = 52.36 kJ + 14.61 × 10^3 kJ. = 14660.75 kJ.
Give one reason why metal spoons are electroplated with silver
Answer:
To give non expensive spoons the appearance and the chemical resistance of the expensive ones.
Explanation:
Companies are cheap and under strict guidelines. This is their loophole.
Electroplating is the coating of metals by the process of hydrolysis. Metallic spoons are electroplated with silver to give an expensive appearance and chemical resistance.
What is electroplating?Electroplating has been known as the electrochemical deposition of the metal on another solid metallic substrate by the process of hydrolysis or cation reduction through electric current.
This process is used to coat metals to prevent them from getting corroded. Also, it has been used to give a decorative and expensive look to ordinary metal.
The metallic spoons are electroplated with silver metal to make them look expensive and rich. The silver moves from the anode towards the cathode where the spoon is in the presence of the current.
Therefore, the metals are electroplated by silver for an expensive and rich look.
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The element Chemistrium (Ch) has 2 varieties, Ch-105 and Ch-117. Ch-110 has a % abundance of 56%. Find the average atomic mass of Ch.
Write the letter of the definition next to the matching word as you work through the lesson. You may use the glossary to help you. flammable A. An action that is taken to prevent harm hazardous waste B. Able to burn easily precaution C. An unwanted product that may pose a threat to human health or to the environment
The answer is B........
Which of the following statements is true about the current in a wire?
A. Depends only on the resistance of the wire
B. Depends only on the potential difference applied
C. Depends on both resistance and potential difference
D. Does not depend on resistance and potential difference
Answer:
the answer is a
Explanation:
Voltage can be thought of as the pressure pushing charges along a conductor, while the electrical resistance of a conductor is a measure of how difficult it is to push the charges along.
Is salt (NaCl) a compound or a
element
Element, compound
Answer:
Compound.
Explanation:
Salt is an ionic compound. How do I know?
When dissolved in water (water is a covalent compound), then salt will allow electricity to move through it because it is a conductor.
Other reasons:
High melting point.
High boiling point.
Strong bond.
Transfers electrons.
Made of a metal or nonmetal.
Etc.
In an electrically neutral atom,
the number of protons equals the number of neutrons.
the number of protons equals the number of electrons.
the number of neutrons equals the number of electrons.
Answer:
B
Explanation:
I may be wrong sorry...
The Protons and Neutrons are in the Nucleus of the Atom, the Atomic Clouds contain the Electrons.
In a constant‑pressure calorimeter, 70.0 mL70.0 mL of 0.320 M Ba(OH)20.320 M Ba(OH)2 was added to 70.0 mL70.0 mL of 0.640 M HCl.0.640 M HCl. The reaction caused the temperature of the solution to rise from 23.00 ∘C23.00 ∘C to 27.36 ∘C.27.36 ∘C. If the solution has the same density and specific heat as water ( 1.00 g/mL1.00 g/mL and 4.184J/g⋅K,)4.184J/g⋅K,) respectively), what is ΔHΔH for this reaction (per mole H2OH2O produced)
Answer:
57.0kJ/mol is ΔH of the reaction
Explanation:
The reaction is:
1/2 Ba(OH)₂ + HCl → 1/2 BaCl₂ + H₂O + ΔH.
Where ΔH is the heat of reaction per mole of water.
Moles of water produced are equal to moles of HCl that are:
70.0mL = 0.070L * (0.640mol / L) = 0.0448moles HCl = Moles of water produced.
Now, heat produced is determined using coffee-cup calorimeter equation:
Q = m×ΔT×C
Where Q is heat released
m is mass of solution (70mL + 70mL = 140mL = 140g -Density of 1g/mL-)
ΔT is change in temperature (27.36°C - 23.00°C = 4.36°C)
And C is specific heat of the solution (4.184J/gK)
Replacing:
Q = 140g×4.36°C×4.184J/gK
Q = 2553.9J
This is the heat released when 0.0448 moles of water are produced, that means ΔH is:
2553.9J / 0.0448moles
ΔH = 57000J/mol =
57.0kJ/mol is ΔH of the reaction
What properties of an element are affected by electron distribution?=
Define malleability.
Define ductility.
State one reason gold is used in jewelry.
Why is mercury no longer used in many devices?
What are the properties of nonmetals?
List the states of matter in which nonmetals can exist and give one example of each state.
What are the physical properties and uses of sulfur?
What are the physical properties and uses of bromine?
What are the physical properties and uses of helium?
Define “metalloid.”
Why would it be difficult to decide whether or not an element was a metalloid based on its properties?
Why is silicon used extensively in electronics?
What are borosilicates used for?
Why is the use of arsenic as an insecticide decreasing?
What is a main application of antimony?
Answer:
Capable of being hammered out thin
Explanation:
, as certain metals; malleable. capable of being drawn out into wire or threads, as gold. able to undergo change of form without breaking.
Determine the mass of 3 moles of H2O
Answer:
Short answer 18x3=54 gram
Explanation:
When you express molecular mass (in case of molecule)/atomic mass(in case of atom) in gram it will be equivalent to one mole. For example:
12 gram Carbon atom = 1 mole of Carbon atom = N number of Carbon atom
16 gram Oxygen atom= 1 mole of Oxygen atom = N number of Oxygen atom
32 gram Oxygen molecule (O2) = 1 mole of Oxygen molecule (O2) = N number of Oxygen molecule (O2)
similarly 1 mole of water is equivalent to molecular mass of water x 3 that is 18x3=54 gram. It would constitute 3N molecules of water.
N: Avogadro's number : 6.022140857 × 10^23
Explanation:
According to the mole concept ,the mass of 3 moles of H₂O or water is 54 g.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons .Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Number of moles is obtained as, mass/molar mass.Substituting number of moles as 3 and molar mass as 18 g mass=18×3=54 g.
Thus, the mass of 3 moles of H₂O is 54 g.
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A balloon-borne package of sensors that gathers upper-level temperature, air pressure, and humidity is a. A radiosonde. C. A hygrometer. b. A satellite. D. Doppler radar
Answer:
Option A (A radiosonde) is the right response.
Explanation:
The Radiosonde would be a battery-powered telemetry method used to determine atmospheric parameters. It comprises such a weather balloon that receives information to something like a surface receiver via a radio. It's important although it serves as an important means of meteorological data collection.Some other alternatives offered are not connected to the circumstance in question. So, the alternative here was the right one.
PLEASE ANSWER QUICK THANK YOU
If
then air temperatures increase *
O Carbon dioxide levels increase
O Carbon dioxide levels decrease
Carbon dioxide levels are not related to air temperature.
Answer:
If Carbon Dioxide levels go up then so does air temperature
1.A particular ion has a positive two charge. What does this indicate about the particle and its electrons?
2.What type of elements (metals, nonmetals, or metalloids) are involved in ionic bonding? How does an ionic bond occur?
3.What kind of bond would form between iron and copper? How do you know?
4.How do you know if a covalent bond has formed?
5.A bond forms between hydrogen and bromine. Will it be ionic, polar covalent, or nonpolar covalent? How do you determine this?
describe a system that explains or demonstrates how action/reaction pairs must naturally exchange energy as forces act within the system. Please try and use Claims Evidence Reasoning.
Answer:
Wait so is there a amount of sentences that you have to write
The chemical equation shown below represents a reaction that produces fuel for certain cars. CO + H2O - CO, + H2 Which substance represented in this equation is classified as an element? F CO GH, нсо, J H2 F b G OOOO C. H 1
Answer:
The equation to this question is unclear. The equation is as follows:
CO + H2O ---> CO2 + H2
The substance classified as an element is H2.
Explanation:
An element is a substance composed of atoms of the same type. It is the simplest chemical substances that cannot be broken down by any chemical reaction. According to this question showing a chemical equation that produces fuel for certain cars:
CO + H2O ---> CO2 + H2
H2 is the substance that represents an element because it is made up of two atoms of hydrogen to form a molecule. Other substances in the reaction like (CO, CO2, H2O) are made up of two or more different atoms, hence, they are compounds not elements.
The substance represented in the given chemical equation which is classified as an element is: J. [tex]H_2[/tex]
An element can be defined as a pure substance which comprises atoms with the same atomic number (number of protons) in its atomic nuclei.
Basically, an element is any pure substance that can't be broken down, decomposed or transformed into simpler substances by chemical or physical means.
In Chemistry, some examples of an element include the following:
Carbon.Argon.Sodium.Oxygen.Hydrogen.[tex]CO + H2O --> CO_2 + H_2[/tex]
From the above chemical equation, the substance which is classified as an element is hydrogen ([tex]H_2[/tex]).
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Vinegar is acidic and causes the surface of the egg shell to become positively charged. Why might this result in a chemical reaction with the food coloring while nothing seemed to happen to the egg in the water solution? What does this tell you about the charge of the food coloring molecules?
Answer:
Explanation:
In order to be able to solve this question/problem efficiently one has to understand the the concept of acidity. Using the Bronsted- Lowry definition, Acids can be defined as any substance that has the ability of donating proton/ Hydrogen ions,H^+.
REASON BEHIND THE POSITIVELY CHARGED SURFACE:
The protons that acids produces will react with the shell of the eggs which contains a calcium compound. When these protons from acid react with the shell of the egg there is productions of Calcium ion, Ca^2+ and other materials such as water.
WHY MIGHT THIS RESULT IN A CHEMICAL REACTION WITH THE FOOD COLORING WHILE NOTHING SEEMED TO HAPPEN TO THE EGG I
THE WATER SOLUTION?
Nothing happens to the water solution because water is not acidic. The positive ions (produced by the reaction of protons with the egg shell) are able to reach with negative ions.
WHAY DOES THIS TELL YOU ABOUT THE CHARGE OF THE FOOD COLORING MOLECULES?
They are negatively charged.
what does it mean when we say chemistry is the structures , composition, transformation and property of chemicals????pleazzz i wanna the right answer?
Explanation:
Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.
what are the two basic parts of the atom
Answer:
The nucleus and electrons the electrons orbit around the nucleus.
Explanation:
Answer:
nucleus and electrons
Explanation:
nucleus in the middle of the atom containing protons and nuetrons and the outer region contains the electrons
A bottle of water has a volume of 560ml and a mass of 1250g. What is the density
Answer:
this is so u can give him brainliest, he deserves it
Explanation:
2.22 is correct
PLEASE HELP!!!
need help asap!!
Answer:
the tree branch is puching up on his foot
Identify the preposition in the following sentence.
Khari will finish typing his science report before dinner.
O his
o
O finish
O before
What is the number 98.907 called? *
1 point
43
Тc
Technetium
98.907
atomic number
atomic mass
element symbol
element name