can someone please help me and don’t answer if you don’t know the answer please
thank you :)
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Related Questions
How many moles of water (H2O) are produced when 2 moles of KMnO4 react with plenty of HCl?
2 KMnO4 + 16 HCl → 2 KCl + 2 MnCl2 + 8 H2O + 5 Cl2
A. 2
B. 16
C. 8
D. 5
Answers
Answer:
16
Explanation:
2 KMnO4 (aq) + 16 HCl (aq) → 2 MnCl2 (aq) + 2 KCl (aq) + 5 Cl2 (g) + 8 H2O (l)
This is an oxidation-reduction (redox) reaction:
2 MnVII + 10 e- → 2 MnII (reduction)
10 Cl-I - 10 e- → 10 Cl0 (oxidation)
KMnO4 is an oxidizing agent, HCl is a reducing agent.
This is a gas evolution reaction, Cl2 is the formed gas.
at what temperature does water change from a liquid to a gas
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Answer:
212 degrees
Explanation:
Answer:
212 degrees Fahrenheit
Explanation:
Similarly, if we heat a volume of water above 100 degrees Celsius, or 212 degrees Fahrenheit, water changes its phase into a gas called water vapor. Changes in the phase of matter are physical changes, not chemical changes.
Explain:Will the bag of dog food be easier to lift?
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Answer: Registered. My 65 pound dog and my 20 pound dog share an 18 pound bag of 4Health and it lasts them 3 and 1/2 weeks.
Explanation:
Answer:
Well it depends how much the bag weighs in LB and your strength.
Explanation:
pls help asap!!!!!!!
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Where are fusion reactions found
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Answer:
In a nuclear fusion reaction, the nuclei of two atoms combine to create a new atom. Most commonly, in the core of a star, two hydrogen atoms fuse to become a helium atom. Although nuclear fusion reactions require a lot of energy to get started, once they are going they produce enormous amounts of energy.
Explanation:
describe a second degree burn
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Answer:
Second-degree burns, or partial thickness burns, are more severe than first-degree burns. They affect the outer layer of skin, called the epidermis, and part of the second layer of skin, called the dermis. Second-degree burns can be very painful and often take several weeks to heal.
Explanation:
The value of resistance r was determined by measuring current I flowing through the resistance with an error
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Correct question is;
Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is?
Answer:
6%
Explanation:
From ohms law, we know that;
R = V/I
Where;
R is resistance
V is voltage
I is current
Now, the percentage error in the resistance is given by the formula;
ΔR/R = ΔV/V+ ΔI/I
We are told that the current and the voltage difference have a percentage error of 3% each. Thus;
ΔR/R = 3% + 3% = 6%
Select all the correct answers.
Why do the atoms in a piece of copper metal have no net charge?
1.The charges of the positive and negative copper ions cancel each other out.
2.The number of electrons surrounding each copper nucleus doesn’t change.
3.Copper atoms can’t lose electrons without a substance present to gain electrons.
4.When a copper atom loses electrons, it also loses a corresponding number of protons.
5.The copper atoms exchange neutrons instead of electrons.
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Answer:
The correct answer is the charges of the positive and negative copper ions cancel each other out.
Explanation:
A copper metal having no net charge means that it is a neutral atom. A neutral atom means that total number of protons is equal to the total number of electrons.
Select the correct answer.
What is the chemical formula of trisilicon tetranitride?
A.
Si3N4
B.
Si4N3
C.
Si3N6
D.
Si6N3
E.
Si4N6
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Help chemistry work!!!!!!!!
Answers
Answer:
SEE EXPLANATION
Explanation:
A)
1) The balanced chemical reaction is;
Fe2O3 + 3H2O------> 2Fe(OH)3
2) C12H22O11------> 12 C + 11H2O
B) 1 is a combination reaction
2 is a decomposition reaction
C) The molar mass of NH3 is 14 + 3(1) = 17 g/mol
Percentage composition of N = 14/17 * 100/1 = 82. 4 %
D) 1 mole of O2 contains 6.02 * 10^23 particles
E) For (NH4)3 PO4
We have 3(14 + 4(1)) + 31 + 4(16) = 149 g/mol
F) 1 mole of CaCO3 contains 100g of CaCO3
1.25 moles of CaCO3 contains 1.25 * 100/1 = 125 g of CaCO3
During ANY type of phase change, which of the following is TRUE? *
1. The temperature changes
2. The energy increases
3. The energy decreases
4. The temperature stays the same
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What is a major problem with CFCs?
A-it is toxic to breathe.
B-It does not readily break down in the atmosphere.
C-It is a greenhouse gas.
D-It isn't a good refrigerant
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Can someone help me thx
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Answer:
salt i know the answer and even sugar is
If I have 5.275 moles of gas at a temperature of 575 K and a pressure of 7.75 atmospheres, what is the volume of the gas?
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Answer:
hi
Explanation:
Put this equation into word form.
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Answer:
2
Explanation:
symbol of postassium is k and there is no symbol k. so i guess no2
What is the difference between a divide and a drainage basin?
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Answer:
Drainage basin, also called catchment area, or (in North America) watershed, area from which all precipitation flows to a single stream or set of streams. ... The boundary between drainage basins is a drainage divide: all the precipitation on opposite sides of a drainage divide will flow into different drainage basins.
Explanation:
just looked it up
Janice wants to grow flowers in her backyard. She has four types of dirt that she could use, but she is unsure of which type would allow the flowers to grow the best. In order to figure this out, she sets up an investigation. Janice puts each type of soil in a different pot and plants a flower in each pot. What scientific question should Janice ask from her experiment?
A.
Which soil looks the best?
B.
Which soil type allows the flower to grow the most?
C.
Which soil is the oldest?
D.
Which soil type is preferred by most people?
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Answer:
B
Explanation:
She is unsure of which soil would allow the flowers to grow best so the soil that allows the flower to grow the most is the best soil.
Answer:
B. which soil type allows the flower to grow the most?
A worker paints a 5.2 foot wide crosswalk on a street her boss tells her to make crosswalk 1.25 foot
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The question is incomplete. The complete question is :
A worker paints a 5.2 foot wide crosswalk on a street her boss tells her to make crosswalk 1.25 feet wider. How wide is the finished crossroad ?
Solution :
It is given that the worker paints a crossroad on a street whose width is = 5.2 feet.
The boss of the worker asks the worker to make the width of the cross road 1.25 feet more wider.
Thus the required width of the cross road is = 5.2 feet + 1.25 feet
= 6.45 feet.
Therefore the finished cross road is = 6.45 feet wide.
Find the amount of heat (Q) needed to raise the temperature of 5.00 g of a substance from 20.0 C to 30.0C if
the specific heat of the substance is 2.01 J/gC.
Answers
Answer:
100.5 J
Explanation:
1. How many atoms of oxygen are present in 0.04 mole NaNO3?
2. How many moles of nitrogen atoms are present in 10.5g of N2O5?
3. How many atoms of oxygen are present in 50g of Fe(H20)2(S04)3? Please answer fast
Answers
Answer:
1. 7.227x10²⁴ O atoms
2. 0.1944 mol
3. 3.18x10²³ atoms
Explanation:
1. To solve this problem we need to use Avogadro's number, which states the number of molecules that are in 1 mol of a substance:
0.04 mol NaNO₃ * 6.023x10²³ molecules/mol = 2.409x10²⁴ molecules NaNO₃There are 3 O atoms per NaNO₃ molecule, thus the answer is (3* 2.409x10²⁴) 7.227x10²⁴ atoms.
2. First we convert 10.5 g of N₂O₅ into moles, using its molar mass:
10.5 g N₂O₅ ÷ 108 g/mol = 0.0972 mol N₂O₅There are 2 N moles per N₂O₅ mol, thus the answer is (2*0.0972) 0.1944 mol.
3. First we convert grams into moles:
50 g Fe(H₂O)₂(SO₄)₃ ÷ 379.85 g/mol = 0.132 molThen we use Avogadro's number:
0.132 mol * 6.023x10²³ molecules/mol = 7.95x10²² molecules Fe(H₂O)₂(SO₄)₃There are 14 O atoms per Fe(H₂O)₂(SO₄)₃ molecule, so the answer is (7.95x10²² * 4) 3.18x10²³ atoms.
PLS HELP ME WITN THIS ILL GIVE BRAINLIEST
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A chemical property of a substance is a certain characteristic that can only be observed by participating in a chemical reaction. Alternatively, a chemical property of a substance is something that can only be observed when the substance undergoes a chemical change.
I'm not sure what you're supposed to do with the first four boxes; all four are examples of chemical properties. Do you have to name the specific type of chemical property as given in the description? If so, the following would be my answers:
Flammability/Combustibility: The ability of a substance to burn.
The next two are quite strange; I'm not aware of a term that cleanly describes reactivity with water or acid. I suspect that, given the level of the material here, the general property of "reactivity" might be the answer for both the second and third descriptions
(Water-)reactivity: Some substances react when put in water.
(Acid-)reactivity: Some substances react when put in acid.
Light sensitivity: Light can interact with some things to form new substances.
As for the chart, I've filled it in as shown in the attached image. Please take care to double-check what I've written; in particular, when it comes to the property, I might have used a different term from what you were taught in class or provided in some other resource that I don't have access to. I've also color-coded qualitative/quantitative and physical/chemical for your convenience.
what did the law of octaves state about the elements
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Law of octaves states that when the elements are arranged in ascending order of atomic mass, every eighth element has comparable properties.
What are the characteristics of law of octaves ?Features of law of octaves -:
Newland Octaves arranged the known 62 elements into 8 groups of 8 each. The elements were in increasing order of atomic weight.Every element shared properties with the 8th element after it.Some limitations were made into this -:
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The law of octaves state about the elements that there must be 8 electrons in the outermost or valance shell of the electron to obtained the stability.
What is octaves rule?when the elements are arranged in the increasing order of atomic mass, every eighth element has comparable properties and that was the first time an atomic number was introduced to each element of the periodic table.
To become the stable according to rule element must complete it octave otherwise it cannot be considered the stable one.
Therefore, law of octaves state about the elements that there must be 8 electrons in the outermost or valance shell of the electron to obtained the stability.
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which of the following correctly represents the radioactive decay of cesium-137?
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Human reproduction involves eggs, ovaries, sperm, and testes.
Which of these are gametes?
A eggs and sperm
B eggs and ovaries
C ovaries and testes
D sperm and testes
Answers
Answer:
A. Eggs and sperm
Explanation:
Genres are an organisms reproductive cells. Also referred to as sex cells. Females they are ova or egg cells, and males they are sperm.
How to name the hydrocarbons? according to IUPAC i guess?
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Answer:
hydrocarbons are compounds which contains Hydrogen and carbon
Can someone help me thx asap
Answers
Answer:
solvent
Explanation:
the solvent is usually a liquid substance
Zn + 2HCl → ZnCl2 + H2
What is the half reaction for the reduction of hydrogen in the reaction?
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Answer:
2H^+ +2e -> h2(g)
Explanation:
Since hydrogen is reduced, look for a decrease in oxidation number and the gain of electrons.
Answer:
ZnCl2 + H2
Explanation:
got it correct!
identify a pH value between 2.5 and 7.5 at which the concentration of the weak acid being titrated is less than the concentration of its conjugate base.
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The acids do not completely dissociate in water. So, they tend to form a buffer system. Above pH 3.5, the concentration of the conjugate base is more than the concentration of the acid.
Weak acids: These are the acids that do not completely dissociate in water. So, they tend to form a buffer system.Buffers are used to resist a slight change in pH. The pH is equal to the pKa of the solution at equivalence.At equivalence, the concentration of weak acid and its conjugate base is equal.After the equivalence point, the concentration of the conjugate base is more than the concentration of the acid.
Therefore, after 3.5 the concentration of the conjugate base is more than the concentration of the acid.
Learn more about Buffer:
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what is a climax community? no plagiarism.
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Answer:
In scientific ecology, climax community or climatic climax community is a historic term for a boreal forest community of plants, animals, and fungi which, through the process of ecological succession in the development of vegetation in an area over time, have reached a steady state.
Explanation:
type the correct answer in each box balance the equation
Answers
Answer:
5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2
Explanation:
This question involves balancing the above equation. An equation is said to be BALANCED when all the atoms of each element in the reactant side equates that in the product side.
According to this question, a chemical reaction is given as follows: SiO2 + CaC2 = Si + CaO + CO2. Based on observation, the atoms of elements are Silicon, oxygen, calcium and carbon are not the same on the reactants and products side. Based on this, the balanced equation is:
5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2