Answer:
=work output /work input ×100%
Explanation:
(30/10 )×100%
=300
Because they have aromas, compounds with a ring of resonance bonds are called –
A) fragrent compounds
B) pungent molecules
C) aromatic compounds
D) scented structures
Please helppp and no linkss
Answer:
C I'm pretty sure
Explanation:
uhhhhhhhhh yes
Buscaban el elixir de la vida eterna A) Los alquimistas B) Los flogistas C) Los iatroquímicos D) Los químicos E) Los brujos
Answer:
A) Los alquimistas.
Explanation:
¡Hola!
En este caso, es necesario recordar que en la historia de la ciencia, la alquimia se define como una vieja práctica protocientífica con tintes filosóficas que se enfocaba en la combinación de elementos de la química, metalurgia, física, medicina, astrología, semiótica, misticismo, espiritualismo y el arte; por tal razón, se sabe que esta era la que buscaba el elixir de la vida eterna. Por lo tanto, la respuesta es A) Los alquimistas.
¡Saludos!
A boulder sits at rest on top of a mountain. What conclusion can be made about the forces acting on the boulder
Explanation:
Since, the boulder is at rest. This means that there is an equilibrium of forces acting on the boulder.
According to principle of equilibrium of forces a body can be in position of rest only when net force acting on body is zero for translation equilibrium and net moment acting on the body must also be zero for rotational equilibrium.
Therefore, net forces and net moment acting on the boulder is zero.
Exercise 2:
The thermic decomposition of potassium chlorate (KClO3
) is a method used at laboratory to produce oxygen (O2
) and produce potassium
chloride (KCl).
1. Write the balanced equation of the reaction
2. Calculate :
3.1. The molar mass of KClO3
3.2. The number of moles of oxygen gaz produced during the decomposition of
0,5mol de KClO3
(s)
3.3. The mass of potassium chloride obtained from 30,6 g KClO3 solid
M(K)= 39 g.mol-1
; M(Cl)= 35 g.mol-1
; M(O)= 16 g.mol-1
Answer:
1. KCLO3------>KCL + 3/2O2(g)
2. 122.5g/mol
3. 0.2mol
4. 18.5g
Observe: click reset. select the gas collection setup. chemists use this apparatus to collect any gases produced in the reaction. from the reaction flask, gases travel through a long tube and into a cylinder of water. as gases bubble into the cylinder, the water is displaced (removed) until the cylinder is filled with gas. click play and observe the cylinder. was any gas produced in the reaction? [ ]
Hello. Although it is not possible to see the video to which the question refers, we can see, in the question, that water is removed from the cylinder as a gas is added to the same cylinder. So we can see that a gas was produced in the reaction, through the displacement of water, that is, if the water starts to be removed from the cylinder, it is because the reaction is producing a gas. If the gas is not produced, water will not come out of the cylinder.
butane is a saturated hydrocarbon
If this abudullah kid answers I will report you
Explanation:
a. The melting point is at 20C and the boiling point is at 80C. The melting point is when a solid is going through a phase change to become a liquid, that is the 1st plateau in the graph. The boiling point is when the liquid is going through vaporization to become a gas. That is the second plateau.
b. At 30C, it is a liquid, since our melting point is at 20C.
c. The substance before 20C is a solid, as we add energy, it will melt and become a liquid.
The graph is different for each substance but in this same configuration where a change in the graph is a different phase or a phase change.
Where that first incline = solid
1st plateau= melting or freezing
2nd incline= liquid
2nd plateau= vaporization or condensation
3rd incline= gas
Using the reaction: Mg + O2 --> Mgo,
What is the balanced equation?
If you start with 2g Mg, how many grams of
02 do you need for this reaction to go to
completion?
Answer:
2Mg +O2 -----》 2MgO
the balanced equation
if you start with 2g of Mg let's calculate moles
one mole of mg id 24.30 g
so number of moles =0.08
hence 2 moles of Mg reacts with 1 mole of O2 molecule
so Moles of O2 molecule is 0.04
and mass of O2 in gm is = 16 ×0.04
which is equal to 0.64 gm
so the conclusion is if you start with 2g Mg, you need 0.64 grams of
O2 molecules for this reaction to go to
completion!!
i d k it's right or wrong but i tried my best :)
help me please id appreciate it
Answer:
Thats the periodic table of elements
Explanation:
Uhhhmmm help please
Answer:
it is used for testing the presence of starch in plants
Explanation:
it is the important element
1. Place these unknown pH test papers in order from most acidic to most alkaline.
B
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14
pH color chart
A. Paper D, paper C, paper B, paper A
B. Paper B, paper A, paper C, paper D
CPaper C. paper D paper A, paper B
D. Paper D paper o paper A, paper B
Answer:
D. Paper D, paper C, paper A, paper B
Explanation:
Please check the attached image for a diagram showing clearly the pH colour chart
pH measures how acidic or alkaline a solution is. The pH scale ranges from 1 - 14
Solutions with a pH less than 7 are acidic
Solutions with a pH equal to 7 are neutral
In the image, test papers D and C occur on the left, thus, they are acidic
Solutions with a pH greater than 7 are alkaline
pH test papers are used to test to test how acidic or alkaline a solution is
How many molecules of ammonia would there be in 40.0 grams of ammonia?
1.42x10^24 molecules
40.0 grams NH3 (6.02x10^23/17.0 grams NH3)= 1.42x10^24 molecules
What are the half-reactions for a galvanic cell with aluminum and gold electrodes?
A. A3+ (aq) + 3e > Al(s) and Au+(aq) + e* → Au(s)
B. Al(s) → A13+(aq) + 3e and Aut(aq) + e
Au(s)
C. AB+(aq) + 3e – Al(s) and Au(s) — Au (aq) + e
D. Al(s) → AB+(aq) + 3e and Au(s) → Au(aq) + e
Answer:B is right
Explanation: Al loses electrons and is oxidised, Au gains electron. And is reduced
To solve such this we must know the concept of half cell reaction. Therefore, the correct option is option B that is Al(s) → A1³⁺(aq) + 3e and Au(aq) + e [tex]\rightarrow[/tex]Au(s)
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant. Al loses electrons and is oxidized, Au gains electron. And is reduced.
Therefore, the correct option is option B that is Al(s) → A1³⁺(aq) + 3e and Au(aq) + e [tex]\rightarrow[/tex]Au(s)
Learn more about the chemical reactions, here:
brainly.com/question/3461108
#SPJ2
Why is a comet's orbit considered a cycle?
Answer:
. Comets go around the Sun in a highly elliptical orbit.
Explanation:
Answer:
Comet's orbit around the sun at a rapidly high speed witch considers the comets orbit a cycle.
How many mols of H2SO4 is in 0.80 L of 1.40 M H2SO4?
PLEASE HELP
A strong acid will __________ into ions when placed in water.
A
not dissolve
B
partially dissolve
C
completely dissolve
D
sometimes dissolve
Answer:
c. completely dissolved
how many mol are there if there are 3 mol of KNO3?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles KNO3, or 101.1032 grams.
Which statement is true about our Sun?
The Sun is the 2nd closest star to the Earth.
The Sun is a couple of million miles away from other stars.
The Sun is a white dwarf.
The Sun is yellowish in color.
Answer:
The sun is yellowish in color
Explanation:
The Sun is the closest star to the Earth.
The Sun is more than a couple million miles from other stars.
The Sun is not a white dwarf, but will become one in the future.
The Sun IS a yellowish color so.....
Which of the following is true of oxygen?
A. Oxygen is an element because its most basic unit is a single type of atom.
B. Oxygen is a compound because its most basic unit is a single type of atom.
C. Oxygen is a mixture because its most basic unit contains more than one particle.
D. Oxygen is a compound because its most basic unit contains more than one type of particle.
Answer:
A. Oxygen is an element because its most basic unit is a single type of atom.
Explanation:
Oxygen is the chemical element with the symbol O and atomic number 8.
What is the molarity of a solution made from dissolving 10.0 moles of NaOH into 5.0
liters of solution?
A. 1.0 M
B. 1.5 M
C. 5 M
D. 2 M
Answer:
Option D
Explanation:
Molarity (M) of any solution is equal to the number of moles (n)of solute in it divided by total volume of solution (V)
Mathematically, it can be represented as
[tex]M = \frac{n}{V}[/tex]
Substituting the given values, we get-
[tex]M = \frac{10}{5} = 2[/tex]
Hence, option D is correct
Hello, just wondering if anyone could help. If so thanks!!!
What is the difference between voluntary and involuntary muscles?
A. Voluntary muscles are striated and tire easily; involuntary muscles are not striated and do not tire easily.
B. Voluntary muscles can be almost anywhere; involuntary muscles are found only in the heart.
C. Voluntary muscles are under your conscious control; involuntary muscles are not.
D. Voluntary muscles are all skeletal muscles; involuntary muscles are cardiac muscles.
What is the density of an object with the mass of 204 grams? It displaces 17ml of water. please help!
Answer:
12 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
We have
[tex]density = \frac{204}{17} \\ = 12[/tex]
We have the final answer as
12 g/mLHope this helps you
The rate law, rate constant, and reactant concentrations for the reaction of nitrogen dioxide with oxygen are given. What is the rate of the reaction under these conditions?
R = k[NO]2[O2], k = 7,000 M-2 • s-1
[NO] = 0.040 M, [O2] = 0.060 M
A. R = 7,000 M-2 • s-1
B. R = 16.8 s-1
C. R = 0.672 M • s-1
D. R = 0.040 M2 • s-1
Answer:
Its C.
.
.
.
.
.
.
.
.
.
.
Answer:
Person above is correct
The answer is C
Explanation:
1. How is energy transported from where it is generated to homes?
2. How is some energy lost as it is transmitted and how can this be minimized?
Plz answer fast its worth 30 points
Answer:
1. (put in simpler words so no one knows you got it off of brainly)
The electricity that flows to our homes is generated in power stations. From here, it flows through large transmission lines, which carry it to substations. Finally, distribution lines carry electricity from substations to houses, businesses, and schools.
2. (put in simpler words so no one knows you got it off of brainly)
The transmission over long distances creates power losses. The major part of the energy losses comes from Joule effect in transformers and power lines. The energy is lost as heat in the conductors. This can be minimized by
answer choice 1: reducing technical losses including: replacing incorrectly sized transformers, improving the connection quality of conductors (power lines), and increasing the availability of reactive power by installing capacitor banks along transmission lines.
answer choice 2: (just in case answer choice 1 isn't what you're looking for)
You can reduce losses in your home by spreading out your electricity use evenly throughout the day, instead of running all your appliances at once.
Explanation:
hope this helped <3
A student measures out 5 mL of calcium chloride solution into a small container and 5 mL of sodium carbonate solution in another small container. The total mass of both chemicals and the containers they are in is 15.5 g. When the student combined the two clear liquids, a gooey, cloudy precipitate formed. What would the total mass of the products and the two containers be after this reaction took place?
Group of answer choices
15.2 g
15.5 g
31.5 g
Answer:
15.5g
Explanation:
your welcome
HNO3 + KOH + H2O + KNO3
ACID:
BASE:
SALT:
Explanation:
acid, HNO3
base, KOH
salt ,KNO3
Consider the reaction
2 NO2 (g) <=> N2O4
If the equilibrium concentration of both NO2 and N2O4 are 0.2 M, what is the value of Kc?
A. 0.2
B. 0.3
C. 0.225
D. 5.0
E. 2.5
Please help.
Answer:
D. 5.0
Explanation:
Step 1: Write the balanced equation at equilibrium
2 NO₂(g) ⇄ N₂O₄(g)
Step 2: Calculate the concentration equilibrium constant
The concentration equilibrium constant (Kc) is equal to the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients.
Kc = [N₂O₄]/[NO₂]² = 0.2 / 0.2² = 5
what type of intermolecular forces does ammonium lauryl sulfate have?
Answer:
Ammonium lauryl sulfate, like any other surfactant, makes a good base for cleansers because of the way it disrupts the hydrogen bonding in water. Hydrogen bonding is the primary contributor to the high surface tension of water. In hydrogen bonding with the water surrounding them.
How many moles are in 38 grams of Argon?
Answer:
we can conclude that there are 0.55 moles in 22 grams of argon.