Answer: e
Explanation:
Answer:Double Replacement
Describe the structure or shape of DNA
Answer:
a double helix structure
Explanation:
a two-stranded molecule that appears twisted, giving it a unique shape referred to most commonly as the double helix structure
Describe the sizes of the first 4 planets?
Answer:
Explanation:the answer
Answer:
Bro.
Mercury – 1,516mi (2,440km) radius; about 1/3 the size of Earth.
Venus – 3,760mi (6,052km) radius; only slightly smaller than Earth.
Earth – 3,959mi (6,371km) radius.
Mars – 2,106mi (3,390km) radius; about half the size of Earth.
Jupiter – 43,441mi (69,911km) radius; 11x Earth's size
Explanation:
Calcule la formula empírica de la sustancia está compuesta por 18,4% de carbono 21,5% de nitrógeno y 60,1% de potasio
Answer:
La fórmula empírica es C₂N₂K₅
Explanation:
La fórmula empírica es la expresión más sencilla para representar un compuesto químico e indica los elementos que están presentes y la proporción mínima en números enteros que hay entre sus átomos. A esta fórmula se le conoce también como “fórmula mínima” .
En otras palabras, la fórmula empírica muestra la proporción entre los átomos de un compuesto químico.
Si supones que tenes 100 gramos del compuesto, los porcentajes en masa indicarán los gramos de cada elemento en esos 100 gramos. Si la sustancia está compuesta por 18,4% de carbono, 21,5% de nitrógeno y 60,1% de potasio, entonce habrá 18,4 g de carbono, 21,5 g de nitrógeno y 60,1 g de potasio
Para la obtención de la fórmula empírica entonces, teniendo en cuenta la masa molecular de cada sustancia, en primer lugar se calcula el número de moles relativos de cada elemento químico:
C: 18.4 g/12 g/mol = 1.5 moles
N: 21.5 g/14 g/mol = 1.5 moles
K: 60.1 g/16 g/mol = 3.75 moles
De esta manera hallas la relación entre el número de moles de los distintos elementos, pero no estará expresada en forma de números enteros y sencillos. Para expresar la relación anterior en forma de números enteros y sencillos, divides el número de moles de cada elemento entre el número de moles menor de todos ellos.
C = 1.5 moles/ 1.5 moles = 1
N = 1.5 moles/ 1.5 moles = 1
K = 3.75 moles/ 1.5 moles = 2.5
Si no se obtiene una relación de números enteros, debes multiplicar por un número sencillo para conseguirlo. En este caso, multiplicando por dos obtienes:
C= 2
N= 2
K= 5
La fórmula empírica es C₂N₂K₅
The empirical formula of the compound will be CNK
To get the empirical formula of the compound, we will follow the steps below;
Divide the mass of the elements by the molar mass to get the moles of each element;
For Carbon: 18.4/12 = 1.5 molesFor Nitrogen: 21.5/14 = 1.5 molesFor Potassium: 60.1/39 = 1.5 molesDivide through by the smallest ratio to get the ratio of each element present in the compound
For Carbon: 1.5 moles/1.5 = 1For Nitrogen: 1.5 moles/1.5 = 1For Potassium: 1.5moles/1.5 = 1The empirical formula of the compound will be CNK
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I need question 8 plzzzz
Answer:
3?
Explanation:
Answer:
B has 3 atoms
trust me have done problems like these
A balloon is left in the sun and heats up from 29.4°C to 33.7%. If the balloon
was originally at 0.68L, what is the new volume of the balloon?
Answer:
0.78L
Explanation:
According to Charles law, the equation below can be used to calculate the the new volume of the balloon
V1/T1 = V2/T2 .........eqn(1)
Where T1= initial temperature= 29.4°C
T,2= final temperature= 33.7°C
V2= final volume= ?
V1= initial volume= 0.68L
Making V2 the subject of formula from eqn(1)
V2=( T2 × V1)/T1
= (33.7 × 0.68)/29.4
=0.78L
Hence, the new volume of the balloon is 0.78L
EZ POINTS PLEASE HELP
What particle decomposes to produce the electron of beta radiation? A. electron
b. proton
C. neutron
D positron
Answer:
D
Explanation:
Beta radiation is the emission of the high-energy positron by the beat decay of the atom. The positron decomposes to produce an electron of beta radiation. Thus, option D is correct.
What is beta radiation?Beta radiation is the high-energy formation of the positrons and electrons by the radioactive decay of the high-speed and energy particles emitted by the decay of the nucleus.
The positron is a positive charged sub-atomic particle with mass as same as the electron. It is produced after the beta decay and follows the formation of electrons.
The beta radiations are produced from the radioactive decay that leads to light and particle formation in the form of electrons and positrons.
Therefore, option D. positrons are produced as a result of beta radiation.
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If 0.150 moles of calcium oxide reacts with carbon dioxide gas, how many grams of calcium carbonate can be produced?
Answer:
15 g of CaCo₃
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
CaO + CO₂ —> CaCo₃
From the balanced equation above,
1 mole of CaO reacted to produce 1 mole of CaCo₃.
Next, we shall determine the number of mole of CaCo₃ produced by the reaction of 0.15 mole of CaO. This can be obtained as follow:
From the balanced equation above,
1 mole of CaO reacted to produce 1 mole of CaCo₃.
Therefore, 0.15 mole of CaO will also react to produce 0.15 mole of CaCo₃.
Finally, we shall determine the mass of 0.15 mole of CaCo₃. This can be obtained as follow:
Mole of CaCo₃ = 0.15 mole
Molar mass of CaCo₃ = 40 + 12 + (16×3)
= 40 + 12 + 48
= 100 g/mol
Mass of CaCo₃ =?
Mole = mass / Molar mass
0.15 = Mass of CaCo₃ / 100
Cross multiply
Mass of CaCo₃ = 0.15 × 100
Mass of CaCo₃ = 15 g
Thus, 15 g of CaCo₃ were obtained from the reaction.
3. Which of the following represents a covalent compound?
a. 02
b. CO2
C. Cl2
d. Naci
For the Question "Which of the following represents a covalent compound?" we have
CO_2Option BFrom the Question we are told
'3. c
Generally
a covalent compound is a kind of bond in which valence electrons are shared b/w the party atoms forming the bond
Therefore
We see covalent compound in CO_2 as they match perfectly the phenomenon that is covalent bonding
Therefore
For the Question "Which of the following represents a covalent compound?" we have
CO_2Option BFor more information on this visit
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After the phase change in the diagram below, the molecules will move...
?
Energy transferred in
Molecules moving
around each other
A faster, and the substance will be a solid
B faster, and the substance will be a gas
C slower, and the substance will be a liquid
D slower, and the substance will be a gas
Answer:
C is the correct answer
I hope this helps you:)
Explanation:
C slower, and the substance will be a liquid
A sample of Ar(g) is contained in a
cylinder with a moveable piston at an initial
temperature of T. The volume of the
sample is decreased from 4.5 L to 1.5 L
while the pressure is held constant, as
shown in the diagram below.
Answer:
Option (B) is correct.
Explanation:
Initial temperature of the gas is T.
The volume of the sample is decreased from 4.5 L to 1.5 L while the pressure is held constant.
At constant pressure, the relation between volume and temperature is given by :
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Here, V₁ = 4.5 L, V₂ = 1.5 L, T₁ = T₁, T₂ = ?
So,
[tex]T_2=\dfrac{V_2T_1}{V_1}\\\\T_2=\dfrac{1.5\times T_1}{4.5}\\\\T_2=\dfrac{T_1}{3}[/tex]
So, the final temperature of the gas is [tex]\dfrac{T_1}{3}[/tex]. Hence, the correct option is (B).
An advantage of using renewable energies is? 1.They are harmful to the environment 2.We have a limited supply of them 3.They allow us to take energy from natural processes
Answer:
3. They allow us to take energy from natural processes
Explanation:
There are two major sources of energy namely: renewable and non-renewable. Renewable sources of energy are those natural sources that gets replenished faster than they are utilized, which is contrary to non-renewable sources. Examples of renewable sources of energy are wind energy, solar energy, hydro (water) energy.
According to the question, one advantage or merit that renewable sources have over their counterparts is that they allow us to take energy from natural processes e.g. wind, sunlight etc.
Can someone answer this asap!! All I know is 188g is incorrect!
Answer:
db gb bg
Explanation:
Why do rivers have deltas?
Answer:
A delta is formed when the river deposits its material faster than the sea can remove it. ... Cuspate - the land around the mouth of the river juts out arrow-like into the sea. The Ebro Delta. Bird's foot - the river splits on the way to the sea, each part of the river juts out into the sea, rather like a bird's foot.
I hope it's helpful!
Which has more mass, one mole of carbon (C) or one mole of copper (Cu)?
Explain.
can some give 2 paragraph about science
Answer:
Explanation:Science is the scholarly and down to earth movement, including the efficient investigation of the structure and the laws of nature with intensive trial and pragmatic perception. Science is isolated into three branches: Natural sciences, Social sciences, formal sciences.
Science offers new information and revelations of many things we do not know. Day by day, science is progressing. Now science has helped man reach the moon, which was once unknown to man as a satellite. Every invention in technology or medical techniques is based on science and scientific research
Why should barbecues and cars never be operated in enclosed places?
Severe droughts cause some lands to become deserts, and this process leads to
water shortages
lands becoming
deserts
food shortages
all of the above
why copper ions move to the negative electrode in figure 1
Answer:
negative attraction
Explanation:
because a copper ion looses electrons, meaning it's negatively charged, and positives and negatives attract.
What is the molarity of a solution that
contains 20.0 g of KOH dissolved in 1.25
L?
Answer:
0.40m
Explanation:
Burning match in physical or chemical change and why
Answer:
Answer is on the pic
Explanation:
I hope it's helpful!
what are the preparations of alcohols?
Answer:
Alcohols are prepared by SN2 reaction
Alkyl halides can be converted to alcohols by using SN2 reactions with OH- as a nucleophile. Substrates that undergo substitution by SN1 reaction can be converted to alcohols using water as the nucleophile (and it can even be the solvent).Explanation:
what factors affect freezing-point depression of a solution? (select all that apply)
a. Freezing-point of solute
b. vant hoff of the solvent
c. molal freezing-point depression constant
d. molarity of the solution
e. vant hoff of the solution
f. freezing point of the solvent
g. molality of the solution
Answer:
A and F i think
Explanation:
Freezing point depression is a colligative property observed in solutions that results from the introduction of solute molecules to a solvent. The freezing points of solutions are all lower than that of the pure solvent and is directly proportional to the molality of the solute
Molality of the solution and the Van"t Hoff of the solution affects the freezing-point depression of a solution.
Recall that the formula for freezing point depression is given by;
ΔT = K m i
Where;
T = freezing-point depression of a solution
K = freezing-point constant
m = molality of the solution
i = Van't Hoff factor
We can see two important variables in this equation which are;
Molality of the solution Van"t Hoff of the solutionThese two variables affect the freezing-point depression of a solution.
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how does the chlorine atom attain a stable octet in each of the preceding cases
Answer:
where is the question i can't see it
A ninja motorbike travelling at 55 m/s takes 10 sec to come to rest . What is its deceleration rate ?
Answer:
Speed=Distance
Time
Explanation:
Is it better for an element to be more abundant or less abundant?
I believe it's better for it to be more abundant because it's better to have more then less. Take water as an example. Water is an important factor to our survival and if we didn't have enough of that we would be in trouble. Or if we needed food but there wasn't enough more people would be dying from starvation. It's better to have a little more than a little less.
How many formula units in 7.25 moles of Al2O3.
Answer:
If you're asking for the mass (grams)
then 739.21 g
Explanation:
No. of mols = mass/molar mass
Mass= Molar mass x No. of mols
Mass= 101.96 g/mol x 7.25 mols
Mass= 739.21 g
Please Help
All matter has physical and chemical properties. These properties can be used to identify the type of matter. Which of these statements describes a chemical property?
Select one:
a. A metal is added to a beaker of water, a gas is formed, and the beaker explodes.
b. A certain heavy metal turns to a liquid at room temperature.
c. A 2-feet-long metal bar has a mass of only 176 g.
d. A particular substance evaporates at 30 °C.
Plzzzz helppp this submits in 5 minutes plzzzzz helpppp meeeee
List five predictions of climate change and the effects on earth by the year 2100
Answer:
Predictions:
1. Half of the world will be cold and the other half will be hot, which will cause unbalanced state of climate on Earth.
2. The whole world will start to get hotter and there will be no winters or rain which causes water shortage, unable to grow crops. Polar ice is melting is an example.
3. Floods can come, because water level in sea is rising and it could kill all of us.
4. Earthquake can occur because in the Bible Jesus tells about earthquakes, etc at the second coming of Jesus.
Explanation:
Metal or Non-metal?
Potassium: metal
Fluorine:
Bromine:
Hydrogen
Beryllium:
Nitrogen
Answer:
Fluorine: non-metal
Bromine: non-metal
Hydrogen: non-metal
Beryllium: metal
Nitrogen:non-metal
The mass ratio of H:S:O in sulfuric acid today is 1:8:32. Predict the mass ratio of sulfuric acid in 23th century.
In the 23rd century, the mass ratio of H:S:O in sulfuric acid will remain 1:8:32.
Law of definite proportionsWe know from the law of definite proportions that irrespective of the path through which a chemical compound is obtained, it has a fixed composition by mass.
As such, the composition of a chemical substance does not vary. Therefore, in the 23rd century, the mass ratio of H:S:O in sulfuric acid will remain 1:8:32.
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