Explanation:
Percentage composition = 2/18 = 11.11%.
There is a photon with an energy of 4.51 x 10^-34 J. What is the wavelength of
this light? in nm
Answer:
4.4045358859215327e-17 nm
Explanation:
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Hi! Can you help me?
Is NaCI an element, compound, or mixture?
Thanks!
Answer:
Compound
Explanation:
Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g/mol respectively, 100 g of NaCl contains 39.34 g Na and 60.66 g Cl
What happens in a chemical reaction and what does it require
Answer: i need a pic of it plz
Explanation:
plx
State five differences between compound and mixtures in a tabular form
Answer:
The differences between compound and mixtures in a tabular form are as follow:
Both are written differently. Plz do write by making table at once.
Hope it help you
Which diagram shows an element?
What type of liquid is sucrose solution? (Salt solution, weak acid, etc)
Sucrose solution is an example of sugar solution. Details about a solution can be found below.
What is a solution?A solution is a mixture, which may be liquid, gas or solid, formed by dissolving one or more substances.
A solution is formed when a solute substance dissolved in a solvent.
For example; sucrose is a solute molecule that dissolves in water to form a sucrose solution.
It is important to note that sucrose solution is hypertonic to water i.e. it is a more concentrated solution. There is a net movement of water molecules, by osmosis from the water outside to the sucrose solution.
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HELP PLEASEE I WILL GIVE BRAINLIEST
Classify each characteristic according to whether it is true for an amoeba, a clock, or both.
Answer:
Amoeba: reproduces
clock: lacks genetic material
both: has defined boundary, use energy, and have an internalized organization.
Explanation:
Amoeba is a single cell organism known as amoeboid which is a eukaryotic cell and has all the eukaryotic features such as membrane-bound organelles including the nucleus. The nucleus contains the genetic material of the amoeba cells and which is transferred to the offspring by reproduction. The cell membrane is the outer boundary of the cell use energy to perform its cellular functions.
A clock is a non-living thing that contains many small parts to make it work properly and requires energy to work. It is not a living thing so does not have genetic material. However, it has a defined boundary in it.
A. 207 kJ
B. 4730 kJ
C. 9460 kJ
D. 414 kJ
Answer:
C = 9460 Kj
Explanation:
Given data:
Mass of copper = 2kg
Latent heat of vaporization = 4730 Kj/Kg
Energy required to vaporize 2kg copper = ?
Solution:
Equation
Q= mLvap
by putting values,
Q= 2kg × 4730 Kj/Kg
Q = 9460 Kj
Two reindeer are winding through the winter forest . They spot three owls ,two foxes and four bear . How many legs are there in total?
Answer:
40
Explanation:
8 + 8 + 8 + 16
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6 C
7 A
8 C
9 D
10 B
6 Which of the following would provide the best evidence that air is made of matter? A Making a small hole in a tire and measuring the amount of time it takes for it to become flat B Comparing the mass and volume of an empty balloon to the mass and volume of an inflated balloon C Measuring the temperature of the air in several rooms of varying sizes D Finding the volume of the air between marbles in a jar by pouring water over them
Limiting line of bakmer series result when electron jumps from orbit: A) 3 to 2 B) infinity to 2 C) 4 to 5 D) infinity to 1
1.) Describe the two diagrams of a bottled carbonated beverage shown below as greater
pressure or lower pressure, and then as greater solubility or lower solubility. How do these two
examples illustrate the relationship between the solubility of a gas and its vapor pressure? Explain
2.) On the diagrams below, assume that each beaker contains an equal number of moles
of solute. Label each solution as concentrated or dilute. Then indicate the approximate
relative volumes of each solution by describing the surface level on each beaker.
Answer:
SEE EXPLANATION
Explanation:
If i refer to the bottle at the left hand side as A and the bottle at the right hand side as B. I can say that the bottle A contains solutes which are more soluble than the solutes in bottle B. consequently, A has a lower vapour pressure than B.
We can also see that the pressure in A is much higher than in B(as indicated by the length of the arrows). The higher the pressure, the greater the solubility of the gas. Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.
Again let me call the beaker on the left A and the beaker on the right B. We can see that the beaker on the left contains 10 ml of solution while the beaker on the right contains 50 ml of solution. It follows that beaker A contains a more concentrated solution since that much amount of solute is contained in a smaller volume than in beaker B as shown in the image.
Paper for my last question
Please help I’m desperate giving 50 points and brainliest
Answer:
check explaination
Explanation:
Q. 4:
a) 7 ml
b) 9 ml
c) volume of rock = volume of column (with rock in it) - volume of column (without rock)
= 9-7
= 2 ml
d) density = mass ÷ volume
therefore, mass = volume × density
= 2 × 3 => 6 g
Q. 5:
1st has the highest density
this is because, density = mass ÷ volume
as volume is constant , density is directly proportional to mass
as image 1 has more number of molecules, it's mass will be maximum.
therefore, 1st image will have maximum density
What are food molecules made out of?
Answer:
Most foods are made out of carbon, oxygen, nitrogen and hydrogen
Explanation:
what is dark matter
can we travel faster than speed of light
what is chlorophyll
Answer:
Explaining dark matter and black holes
Here are six big questions about our universe that current physics can’t answer:
What is dark energy, the mysterious energy that appears to be accelerating the expansion of the universe?
What is dark matter, the invisible substance we can only detect by its gravitational effect on stars and galaxies?
What caused inflation, the blindingly fast expansion of the universe immediately after the Big Bang?
For that matter, what caused the Big Bang?
Are there many possible Big Bangs or universes?
Is there a telltale characteristic associated with the death of a universe?
Despite the efforts of some of the world’s brightest brains, the Standard Model of particle physics – our current best theory of how the universe works at a fundamental level – has no solution to these stumpers.
A compelling new theory claims to solve all six in a single sweep. The answer, according to a paper published in European Physical Journal C by Herb Fried from Brown University and Yves Gabellini from INLN-Université de Nice, may be a kind of particle called a tachyon.
Tachyons are hypothetical particles that travel faster than light. According to Einstein’s special theory of relativity – and according to experiment so far – in our ‘real’ world, particles can never travel faster than light. Which is just as well: if they did, our ideas about cause and effect would be thrown out the window, because it would be possible to see an effect manifest before its cause.
Alt
Explanation:
Due to travelling faster than light, dark matter has a higher than usual mass in relation to its resting mass, thus accounting for the large 'missing' mass around galaxies. ... Dark matter is therefore non-baryonic, travelling faster than light and has a mass half that of a photon...
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What is responsible for the blue sky?
Answer:
well for me it's
Explanation:
The reflection of the seas
What is used to determine the number of each atom in an ionic formula
Answer:
The charge carried by each ion (oxidation state of each atom)
Explanation:
If we have an ionic compound and we want to write its formula, we must first know the magnitude of charge on each ion (shown as oxidation state of the atoms involved) because the magnitude of charge on each ion is eventually crisscrossed and gives the subscript (number of atoms) for each atom in the formula.
For instance, let us write the formula of calcium bromide. Ca has a charge of +2 while Br has a charge of -1. If we exchange the charges and ignore the signs such that the crisscrossed charges form subscripts we can now write; [tex]CaBr_{2}[/tex].
A _______ is a repeating disturbance or vibration that transfers or moves energy from place to place without transporting mass. A. vacuum B. force C. medium D. wave plz HELP
Answer:
The answer is wave
Explanation:
How do unbalanced forces cause a change in speed, direction, and position of an object?
Answer:
But its motion is not changing. This is because the forces acting on it from opposite sides are exactly the same size. An unbalanced force can change an object's motion. ... An unbalanced force acting on a moving object could make the object change direction, change speed, or stop moving.
The unbalanced forces are unequal in magnitude. They change the state of motion of the object. The pushing or pulling of an object can generate unbalanced forces and cause change in the direction, and position of an object.
What is an unbalanced force?The two forces of unequal magnitudes and they act on an object simultaneously such that the net force is not zero are defined as the unbalanced forces. The body acted upon by the unbalanced forces changes its state of motion.
The unbalanced forces are the opposite of a balanced force. An unbalanced force causes a change in motion, speed, direction, or movements. Because of unequal force or strength which is applied to one side of an object.
In the case of unbalanced forces, one side has more energy than the other. Opposite sides have forces acting against them.
Thus the unbalanced forces are out of balance and are not equal, it causes body's position to change.
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ILL GIVE BRAINLIEST I NEED THE ANSWER RIGHT AWAY PLEASE SOMEONE
For each of the following processes that show the formation of ions, complete the process by indicating
the number of electrons that must be gained or lost
to form the ion. Indicate the total number of electrons in the ion, and in the atom from which it was
made.
a. Al S Al3 d. F S F
b. S S S2 e. Zn S Zn2
c. Cu S Cu f. P S P3
77. For each of the following atomic
Answer:
ILL GIVE BRAINLIEST I NEED THE ANSWER RIGHT AWAY PLEASE SOMEONE
For each of the following processes that show the formation of ions, complete the process by indicating
the number of electrons that must be gained or lost
to form the ion. Indicate the total number of electrons in the ion, and in the atom from which it was
made.
a. Al S Al3 d. F S F
b. S S S2 e. Zn S Zn2
c. Cu S Cu f. P S P3
77. For each of the following atomic
Explanation:
ILL GIVE BRAINLIEST I NEED THE ANSWER RIGHT AWAY PLEASE SOMEONE
For each of the following processes that show the formation of ions, complete the process by indicating
the number of electrons that must be gained or lost
to form the ion. Indicate the total number of electrons in the ion, and in the atom from which it was
made.
a. Al S Al3 d. F S F
b. S S S2 e. Zn S Zn2
c. Cu S Cu f. P S P3
77. For each of the following atomic
At night, the demand for electricity supplied by a fission nuclear reactor decreases. How is the fission nuclear reaction controlled to avoid overproduction of electricity? The temperature of the reactor is lowered because high temperature and pressure are needed. The temperature of the reactor is raised because the reaction slows down at higher temperatures. The exposure between the fuel rods and a neutron-absorbing material is increased. The exposure between the fuel rods and a neutron-absorbing material is reduced.
Answer:
The exposure between the fuel rods and a neutron-absorbing material is increased.
Explanation:
The exposure between the fuel rods and a neutron-absorbing material is increased.
A nuclear reactor produces energy via a fission reaction. A fission reaction is a self sustaining reaction.
The nuclear fuel is bombarded with neutrons. The process produces more neutrons which continues the reaction.
In order to decrease the rate of reaction, control rods are inserted. These control rods are neutron-absorbing materials.
At night when demand for electricity decreases, the exposure between the fuel rods and a neutron-absorbing material is increased so that more neutrons are absorbed in order to decrease the rate of nuclear reaction.
Which elements are both classified as metalloids?
Ge and As
Bi and Po
B and C
Si and P
Which ion at ground state has the same electron configuration as an atom of neon at ground state?
1. Ca^2+
2. CI^-
3. Li^+
4. O^2-
Answer:
4. O^2-
Explanation:
O^2 has 16 electrons, while Ne has 18 electron. O^2- is a molecule that has one electrons added to each atom, meaning that there are two extra electrons. Which makes O^2 the same electron configuration as an atom of neon.
The ions having same electronic configuration as neon are Calcium, oxygen, and chlorine ion. Thus, options 1, 2, and 4 are correct.
The electronic configuration has been defined as the electron address in a atom. The electronic configuration has been based on the quantum rule for the filling of the electrons.
The number of electrons present in Neon has been 18. Thus, the ion with the presence of 18 electrons has same electronic configuration as Neon.
The number of electrons in the following ions are:
[tex]\rm Ca^{2+}=18\\Cl^-=18\\Li^+=4\\O_2^{-}=18[/tex]
The number of electrons of calcium ion and chlorine ion are similar to the number of electrons of Ne. Thus the ions having same electronic configuration as neon are Calcium, oxygen and chlorine ion. Thus, options 1, 2, and 4 are correct.
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How many grams are in 4 moles of Calcium?
Answer:
160.32 grams of Ca or 160 if rounded
Explanation:
Multiply moles of Ca by the conversion factor (molar mass of calcium) 40.08 g Ca/ 1 mol Ca, which then allows the cancelation of moles, leaving grams of Ca.
4 mol*40.08g/mol = 160.32 grams of Ca
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Answer:
[tex]\boxed {\boxed {\sf 160.32 \ g, \ 160 \ g, \ or \ 200 \ g }}[/tex]
Explanation:
To convert from grams to moles, we must use calcium's molar mass, which can be found on the Periodic Table of Elements.
Calcium (Ca) Molar Mass: 40.08 g/molNow, we can use the molar mass as a ratio or fraction.
[tex]\frac{40.08 \ g \ Ca}{1 \ mol \ Ca}[/tex]
This fraction can be multiplied by the number of moles, which is 4.
[tex]4 \ mol \ Ca * \frac{40.08 \ g \ Ca}{1 \ mol \ Ca}[/tex]
When we multiply, the moles of calcium will cancel each other out.
[tex]4* \frac{40.08 \ g \ Ca}{1}[/tex]
Since the fraction is over 1, we can just remove the denominator and write a simply multiplication equation.
[tex]4* 40.08 \ g \ Ca[/tex]
[tex]160.32 \ g \ Ca[/tex]
Depending on the teacher's instructions, the answer can be left as is or rounded.
If we round to the technically correct number of significant figures, it would be 1, because the original measurement of 4 moles has 1 sig fig. This would 200 grams, but that's a large amount to round.
We could also round to the nearest whole number. The 3 in the tenth place tells us to leave the whole number as it is. This would be 160 grams.
The answer could be 160.32 grams, 160 grams, or 200 grams, depending on rounding and significant figures.
the process by which alkanoic acid reacts reversibly with alkanols is known as what?
Answer:
esterification process
All bonds release or absorb the same amount of energy
true
false
What happens to the molecules as water freezes? A. The water molecules stop moving B. The water molecules move faster C. The water molecules slow down D. The water molecules react chemically to form ice molecules
Answer:A
Explanation: A
The constant collisions of the moving particles of a gas with the walls of the container produce the characteristic called
Answer:
Pressure
Explanation:
Apply the definition of pressure to this problem.
Answer:
energy or pressure
Explanation:
In order for photosynthesis to take place, energy in the form of ______ is required.
A. sound
B. light
C. electricity
D. kinetic
Answer:
B. Light
Explanation:
Light is converted into energy during photosynthesis