Answer:
there are 74
Explanation:
The reaction of zinc metal and hydrochloric acid produces hydrogen gas and zinc chloride. Write the balanced chemical equation. Phases are optional.
Answer:
Zn + 2HCl -----> ZnCl₂ + H₂
Explanation:
The balanced chemical equation for Zn with hydrogen is Zn + 2HCl ---> ZnCl₂+ H₂.
What is balanced chemical equation?
A balanced chemical equation is one in which number of reactant is equal to number of products. When Zinc reacts with hydrogen it will form zinc chloride and hydrogen gas.
Here, 1 molecules of hydrochloric acid are participating in the process, and 1 molecules of hydrogen are being created.
Therefore, The balanced chemical equation for Zn with hydrogen is Zn + 2HCl ---> ZnCl₂+ H₂.
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how an ionic compound made up of charged particles can be electrically neutral
Answer:
Explanation:
Ionic compounds are electrically neutral because the charges of the cations and anions that make up the compound cancel each other out. In the case of salt for example, sodium has a charge of positive one, and chloride has a charge of negative one. Together, they neutralize the compound.
Check all that apply
Use tongs to remove
hot items
Touch the surface.
t
Turn off after use
Answer:
1 and 3
Explanation:
i hope this helps it was an instruction on edge
Answer:
It's 1, Use tongs to remove hot items and 2, Turn off after use
Explanation:
On Edge 2021
please help!!
which oneeeee
what is salt
explinnn hhhhhh hh hh
Answer:
salt is a very well known seasoning
Explanation:
hope this helped :)
QUESTION 5
Sugar and coal are not minerals because they are ___.
A. crystals
B. organic
C. made by humans
D. solid
E. not found with a specific chemical composition
I Will only give brainliest if you are correct
Answer:
They are organic
Which of the following will increase the volume of a gas
Answer:
The volume of a gas is directly proportional to its temperature. Avagadro's Law- Gives the relationship between volume and amount of gas in moles when pressure and temperature are held constant. If the amount of gas in a container is increased, the volume increases.
Answer:
Decreasing the pressure applied to the gas.
Explanation:
Ap3x
What is the final concentration of a solution prepared by diluting 35.0 mL of 12.0 M HCl to a final volume of 1.20 L
Answer: The final concentration of a solution is 0.350 M
Explanation:
According to the dilution law,
[tex]C_1V_1=C_2V_2[/tex]
where,
[tex]C_1[/tex] = concentration of concentrated acid solution = 12.0 M
[tex]V_1[/tex] = volume of concentrated acid solution = 35.0 ml
[tex]C_2[/tex] = concentration of diluted acid solution= ?
[tex]V_2[/tex] = volume of another acid solution= 1.20 L = 1200 ml
( 1L=1000ml)
Putting in the values:
[tex]12.0\times 35.0=C_2\times 1200[/tex]
[tex]C_2=0.350M[/tex]
The final concentration of a solution prepared by diluting 35.0 mL of 12.0 M HCl to a final volume of 1.20 L is 0.350 M
Given the two half-reactions, what must be done in the next step before the reaction can be balanced?
First: upper A u superscript 3 plus right arrow upper A u. Second: upper I superscript minus right arrow Upper I subscript 2.
How many electrons are produced/used in this redox reaction when it is balanced?
2
3
6
Answer:
Given the two half-reactions, what must be done in the next step before the reaction can be balanced?
Answer: Show the number of electrons being lost or grained.
Explanation:
For a two given half-reactions, before the reaction can be balanced determine the number of electrons being lost or grained.
What is a half-reaction?A half reaction is either the oxidation or reduction reaction component of a redox reaction.
The half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction.
Thus, for a two given half-reactions, before the reaction can be balanced determine the number of electrons being lost or grained.
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all energy travels in waves true or false
What is the mass of CO2 lost at 20 min from the limestone sample?
How much CO2, in moles, was lost at 20 min from the limestone sample?
How much CO3 2- was lost at 20 min from the limestone sample?
Answer:
The mass, CO2 and CO3 from the limestone sample is discussed below in details.
Explanation:
(A) mass loss of sample of limestone after 20 min
= 0.8437g-0.5979g = 0.2458 g
From the given reaction of limestone, 2 mol of the sample gives 2 moles of CO 2.
Therefore
184.4 g ( molar mass of limestone) gives2× 44 g of carbon dioxide.
1 g of sample gives 88/184.4 g of carbon dioxide
Hence 0.2458 g sample gives
= 88/184.4 × 0.2458 g = 0.117 g carbon dioxide
(B) mole of CO 2 lost = weight/ molar mass
= 0.117 g / 44 g/mol =0.0027 mole
(C). 1 mol of limestone contain 2 mol of carbonate ion
From the reaction we know that carbonate ion of limestone is converted into carbondioxide
Hence lost carbonate ion = 0.2458 g
(D) we know that
1 mol limestone contain 1mol CaCO 3
Hence in sample present CaCO 3
= 1mole / 184.4 g × 0.8437 g= 0.00458 mol CaCO3
Answer the question below
Answer:
C
Explanation: I think
A Metal pan will heat up quickly when placed over a gas or electric burner. The Metal pan is a good what...
Answer:
heating up, lol
Explanation:
What is represented in each block of the periodic tables?
the answer is c
it wants me to write a 20 letter explanation but ion got time for that
One ion is represented in each block of the periodic tables. Hence option C is correct.
What is periodic table?Periodic table is defined as a table with the chemical elements ordered by increasing atomic number, displaying the elements to show trends in their characteristics. The elements are arranged in the Periodic Table in accordance with their related chemical and physical characteristics. There are rows and columns in the table. The periodic table's vertical columns stand in for Groups. Periods are shown in the table as horizontal rows.
Ions are defined as any atom or collection of atoms that carries one or more electrical charges, either positive or negative. The positive ions are known as cation while the negative ions are known as anion. When an atom's number of protons and electrons is out of balance, ions are created.
Thus, one ion is represented in each block of the periodic tables. Hence option C is correct.
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The diagram shows currents that form as water is heated. Which would most likely contain this same type of current? the air above a wildfire a carton of milk in a refrigerator a snowdrift on a shady mountainside a boulder in a hot desert
Answer:
the answer is A
Explanation:
edg 2020
Answer:
the air above a wildfire/A
Explanation:
Which diagram best shows the field lines around two particles with opposite
charges?
The diagram best shows the field lines around two particles with opposite charges is the third diagram. Therefore, option C is correct.
What is field line ?A graphic tool for viewing vector fields is a field line. It is made up of a fictitious directed line that is perpendicular to the field vector over its whole length.
Among many other sorts, they are employed to display magnetic, electric, and gravitational fields. In the study of fluid mechanics, streamlines are field lines that display the velocity field of a fluid flow.
The field lines are parallel to the charge's surface. Both the size of the charge and the quantity of field lines are proportional. The positive charge is where the field lines begin, and the negative charge is where they come to a conclusion.
Thus, option C is correct.
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Answer: its C
Explanation: I took the test
Which energy transformation produces electricity and is least likely to negatively impact the environment?
Generating electricity from a natural gas-fired power plant
Generating electricity from a natural gas-fired power plant
Generating electricity from a coal-fired power plant
Generating electricity from a coal-fired power plant
Generating electricity from a nuclear power plant
Generating electricity from a nuclear power plant
Generating electricity from a solar panel system
Generating electricity from a solar panel system
electricity from solar panels
Explanation:
All other options produce something after or during the time electricity is made. That something is gas. Not solar
If the hydronium ion concentration of a substance is 1.0 X 10-6 M, what would be the pH of that substance??
Show/Describe your work.
7th grade help me plzzzzz
Answer:
A & B
Explanation:
The answer for the first one is A because the proton is found in the nucleus with the neutron
The answer for the second was is B because the Neutrons, protons and electrons are all subatomic particles, as they are the main particles that make up an atom.
Proton = Positive Charge (+)
Neutron = Neutral charge (=)
Electron = Negative Charge (-)
Answer:
1- positive
2- A
3-A
Explanation:
List 5 foods that contain bacteria?
Steps in a Nerve Impulse diagram
Answer:
..Repolarization. 2
1 Action potential. Unlike a graded potential, an action potential is capable of traveling long distances. ..
3 Hyperpolarization. ..
4 Refractory period.
Explanation:
Chemistry a sugar solution contains 26g of sugar in .50 l of solution. What is the concentration
Answer:
b cause it say sit
Explanation:
njj
Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions book for this question.
Which explanation accounts for why carbon monoxide is not a polar molecule?
The electronegativity differences between carbon and oxygen are not very large.
Carbon and oxygen do not form ions.
Carbon is a metal, and oxygen is a nonmetal.
There are no hydrogen atoms in the molecule.
Answer:
The electronegativity differences between carbon and oxygen are not very large.
Explanation:
Between the atoms of carbon monoxide exists a covalent bond which attaches the carbon to the oxygen.
In this type of bonding, both atoms shares a given number of valence electrons to attain chemical stability.
A substance is polar when there is a distinct charge separation between the species.
For covalent bonds, the electronegativity difference plays in important role in determining the polarity of the compound. When the difference is large, the compound will be polar but when the difference is very small or zero, no polarity will exist.
In between carbon and oxygen of carbon monoxide, the electronegativity difference is very low.
4. A scientific theory is
1. a well-tested explanation for a widely accepted hypothesis
2. a well-tested explanation for a broad set of observations
3. a proven explanation for the results of multiple experiments
4. a hypothesis that has stood the test of time
Answer:
Option 1
Explanation:
What are the signs of ΔH, ΔS, and ΔG for the spontaneous conversion of a crystalline solid into a gas?
Answer:
ΔH>0, ΔS>0, and ΔG<0
Explanation:
Crystalline solid → Gas
ΔG < 0 T as the reaction is Spontaneous The solid is converted into gas so the Entropy will increase as randomness is more in gas than solid, ΔS > 0using Gibbs equation
ΔG = ΔH - TΔS
as ΔG < 0 and ΔS > 0
ΔH - TΔS <0
ΔH < TΔS ⇒ΔH >0
This gives that ΔH will be Positive but it will be less than TΔS. So we need to provide some energy to convert crystalline solid into gas.
Metamorphic rocks with a non-foliated texture show metamorphic change that involves what
Explanation:
well I'm not 100% sure but I studied a little bit with rocks and crystals I've noticed that the hotter the temperature are it does not matter if it is Obsidian the hotter it is the more shinier it will become so the texture of it has to be a right temperature to be able to create a different texture such as a diamond and a diamond has to be compressed so hard that it will turn into diamond this is just an explanation please do not take this as a real answer I hope this help you though
PLEASE HELP!! Circuit A consist of two wires and a battery. Circuit B consist of the same strength battery and the same type of wires, but it also contains a light bulb. Which circuit has more resistance?
Answer:
light bulb B
Explanation:
more resistance
A sample of 87.6 g of carbon is reacted with 136 g of
fluorine gas to produce carbon tetrafluoride. Using
the balanced equation below, predict which is the
limiting reactant and the maximum amount in moles
of carbon tetrafluoride that can be produced.
C +2F2 → CF4
A. fluorine, 1.79 moles
B. carbon, 7.29 moles
C. fluorine, 6.72 moles
D. carbon, 4.63 moles
Answer:
A. fluorine, 1.79 moles
Explanation:
Given parameters:
Mass of carbon = 87.7g
Mass of fluorine gas = 136g
Unknown:
The limiting reactant and the maximum amount of moles of carbon tetrafluoride that can be produced = ?
Solution:
Equation of the reaction:
C + 2F₂ → CF₄
let us find the number of the moles the given species;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
C; molar mass = 12;
Number of moles = [tex]\frac{87.7}{12}[/tex] = 7.31moles
F; molar mass = 2(19) = 38g/mol
Number of moles = [tex]\frac{136}{38}[/tex] = 3.58moles
So;
From the give reaction:
1 mole of C requires 2 moles of F₂
7.31 moles of C will then require 2 x 7.31 moles of F₂ = 14.62moles
But we have 3.58 moles of the F₂;
Therefore, the reactant in short supply is F₂ and it is the limiting reactant;
So;
2 moles of F₂ will produce mole of CF₄
3.58 moles of F₂ will then produce [tex]\frac{3.58}{2}[/tex] = 1.79moles of CF₄
What is an example of a gas in motion and a fluid in motion?
Answer:
Gas in motion : Vaporization
Examples of fluid flow :
A river flowing down a mountainAir passing over a bird's wingBlood moving through a circulatory systemFuel moving through an engine.Explanation:
polyatomic ions with identical molecular formula called?
