Answer:
1. The temperature increases in the center of a nebula, and nuclei begin to fuse.
2. As the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star.
3. The star stays in the main sequence stage for a long time.
4. The star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass.
5. Heavy elements are created when the supernova explodes.
6. All that remains of the star now is the core. In some cases, the star turns into a black hole.
Explanation:
Which of the following Best describes how a compound naturally occurs
Answer:for my ap3x test the answer was the molecular formula
Explanation:
Ap3x
Answer:
the molecular formula
a p e x
what is a true statement about the atom's nucleus?
How many moles of oxygen are needed to burn 2.7 moles of methyl
alcohol (CH3OH)?
2CH2OH + 302 -→ 2CO2 + 4H2O
please show how you got it
Answer:
3.38 moles of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
4CH2OH + 5O2 → 4CO2 + 6H2O
From the balanced equation above,
4 moles of CH2OH required 5 moles of O2 for complete combustion.
Finally, we shall determine the number of mole of O2 needed to react with 2.7 moles of CH2OH. This can be obtained as follow:
From the balanced equation above,
4 moles of CH2OH required 5 moles of O2 for complete combustion.
Therefore, 2.7 moles of CH2OH will require = (2.7 × 5)/4 = 3.38 moles of O2 for complete combustion.
Thus, 3.38 moles of O2 is required.
When you add so much solute that no more dissolves you have a(n)
Answer:
When you add so much solute that no more dissolves you have a SATURATED SOLUTION.
Answer:
iIt is called as point of saturation or saturated solution
Water is clear and odorless. Is it chemical or physical change?
Answer:
Physical
Explanation:
Water is the only known substance on Earth that exists naturally in three states: solid, liquid, and gas. To change between these states, water must undergo physical changes.. Hydrogen and oxygen are gases at standard temperature and pressure, whereas water is a colorless, odorless liquid
What are the trends for atomic size and ionization? Explain why for each trend. Tell me the direction- up or down a group and across a period for each trend. Use the lecture, the video at the end of the lecture, or the guide for periodic trends to respond to this prompt.
Answer:
See explanation
Explanation:
Atomic size increases down the group due to the addition of more shells.
As more shells are added and repulsion of inner electrons become more significant, atomic size increases down the group. However, across the period, atomic size decreases due to increase in effective nuclear charge without any increase in the number of shells. This causes increased attraction between the nucleus and the outermost shell thereby decreasing the size of the atom.
Ionization energy decreases down the group because the outermost electron is more shielded by inner electrons making it easier for this outermost electron to be lost. Across the period, ionization energy increases due to increase in effective nuclear charge which makes it more difficult to remove the outermost electron due to increased nuclear attraction.
what is the half life?
HELP BRAINLIEST
Answer:
the time taken for the radioactivity of a specified isotope to fall to half its original value.
A precipitate is formed when the two solutions, barium nitrate, Ba(NO3)2, and phosphoric acid, H3PO4, are
mixed. Identify the correct products for this reaction.
A)
BaHa & NPO4
B)
BazN2 & HNO3
Baz(PO4)2 & NO2
D)
Baz(PO4)2 & HNO3
d. Ba₃(PO₄)₂(s)+6HNO₃(aq)
Further explanationDouble-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product
To predict whether this reaction can occur or not is one of them, the precipitation reaction. A precipitation reaction occurs if two ionic compounds which are dissolved reacted to produce one of the products of the ion compound does not dissolve. Formation of these precipitating compounds that cause reactions can occur
Because A precipitate is formed, then compounds of CO₃²⁻ and PO₄³⁻ except for Compounds of Li +, Na +, K +, Rb +, Cs +, and NH₄ + are generally included in the insoluble compound
So the reaction :
3Ba(NO₃)₂(aq)+2H₃PO₄(aq)⇒Ba₃(PO₄)₂(s)+6HNO₃(aq)
A precipitate is formed ⇒ Ba₃(PO₄)₂
This committee, known as the International Union of Chemistry (IUC), developed a specific set of rules for
chemists to follow. What were these rules called?
O
The nomenclature rules
O
The IUC rules
The Geneva rules
The Paris rules
Answer:
Nomenclature Rules
Explanation:
Answer: Its actually the geneva rules
Explanation:
Covalent bonds form through:
a. a combination of transfer of electrons and sharing electrons such that each atom attains an octet.
b. complete transfer of electrons to form cations and anions.
c. sharing of electrons such that each atom attains an octet.
d. sharing of electrons such that each atom attains a total of 10 ve.
Answer:
Sharing of electrons such that each atom attains an octet
Why is it important for a community to have many different organism living together?
Answer:
Individual organisms live together in an ecosystem and depend on one another. In fact, they have many different types of interactions with each other, and many of these interactions are critical for their survival. ... One category of interactions describes the different ways organisms obtain their food and energy.
A fish swimming in water uses its fins to push the water backward, making 2 points
it swim forward. This is an example of Newton's
law of motion. *
Answer:
Newton's third law
Explanation:
A fish swimming uses its fins to push the water backward making it swim forward is obeying Newton's third law of motion.
Newton's third law of motion states that "action and reaction are equal and opposite".
When the fish uses its fin to push the water backward, it reacts by being propelled in the opposite direction which is in the forward sense.
The third law is clear indicator that forces are always in pairs. As the fish swims, a net force between the oppositely directed forces do not cancel out.
CC14
Which of the following elements would most likely form an ionic
compound?
*
Ca and Ni
Cu and Ar
F and S
Na and Cl
Answer:
Na and Cl
Explanation:
An ionic compound is solid at state room temperature. Therefore Na and Cl would be the correct answer :)
A wooden block has a mass of 562 g and a volume of 72 cm3. What is the density rounded to the nearest tenth!
Answer:
The answer is 7.81 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{562}{72} \\ = 7.80555555...[/tex]
We have the final answer as
7.81 g/cm³Hope this helps you
Answer:
r
Explanation:
Why are most metals malleable and ductile?
Answer:
Most metals are malleable and ductile because of the ability of the atoms to roll over each other into new positions without breaking the metallic bond.
Answer:
Look below:
Explanation:
This is because their atoms can roll over each other into new positions without breaking the metallic bonds.
Jaime calculates the density of a slab of aluminum (Al) metal.
What information does Jaime need to evaluate the accuracy of his calculation?
the accepted value for the density of aluminum
the dimensions of the slab of aluminum that he used
a bar graph that shows the densities of different slabs of aluminum
a line graph that shows how the density of aluminum varies with temperature
Answer: the accepted value for the density of aluminum
Explanation:
took the test
a024
Object
Yepop (yp)
copper wire
132 yp
copper spoon 240 yp
glass jar
wooden spoon 240 yp
89 yp
1 point
8. A student believes she has measured a new property of matter that she
did not learn about in class. She calls her new property "Yepop". Above is a
table of Yepop measurements for different objects: Based on her results,
do you think "Yepop" is a property of matter?
A. No, because the copper objects have different measurements.
B. No, because the same substances have the same measurements.
C. Yes, because the spoons have the same measurements.
In the image below, the truck and bus have the same mass and are
traveling at the same speed. Which of these statements accurately
explains their energies? *
A) They have the same gravitational potential energy but have different kinetic
energies
B) They have the same kinetic energy but different gravitational potential energies.
C) The truck has more kinetic energy than the bus.
D) The truck has more gravitational potential energy than the bus
Answer:
B)They have the same kinetic energy but different gravitational potential energies.
Explanation:
I don't know the exact explanation but I just took the test.
PLEAZ HELP!! DUE IN 20!!!
What is some of the evidence used by Galileo to support Capricorns model and disapprove Aristotle's and Ptolemys
Answer:
Over time he discovered that the Moon-like phases of Venus demonstrated that the neighboring planet had an orbit independent of Earth. This showed conclusively that Venus circled the Sun, as Copernicus thought, not Earth, as Ptolemy thought. But it did not yet prove conclusively that Earth circled the Sun.
Answer: Option #3 or C. Jupiter has moons orbiting it.
Explanation: Galieo found moons of Jupiter, conflicting with teachings of Aristotle and Ptolemy.
So the correct answer is option # 3 or C. Did it on Edge got it right! :)
Question: What is some of the evidence used by Galileo to support Copernicus’s model and disprove Aristotle and Ptolemy’s?
Options Given:
A. Each planet spins in an epicycle.
B. Planets appear to move backward.
C. Jupiter has moons orbiting it.
D. The religious and cultural beliefs supported this model.
HCl + Ca(OH)2 --->
and why?
Answer:
CaCl2 + H2O
Explanation:
Is this tinder like my guy
how many moles of hydrogen are in 4.70 moles of C12H22O11
Answer:
103.4 moles of hydrogen
Explanation:
Given data:
Moles of C₁₂H₂₂O₁₁ = 4.70 mol
Number of moles of hydrogen present = ?
Solution:
one mole of C₁₂H₂₂O₁₁ contain 22 moles of hydrogen. Thus in order to determine total number of moles in 4.70 moles of C₁₂H₂₂O₁₁ we will multiply the 22 moles of hydrogen with 4.70 moles of C₁₂H₂₂O₁₁.
1 mole of C₁₂H₂₂O₁₁ = 22 moles of Hydrogen
4.70 × 22 moles
103.4 moles of hydrogen
What are the types of ions found in an ionic bond? (Check all that apply) * 2 points
cations
anions
prions
quarks
The right options is a cation and an anion !
how many electrons in an atom with the electron configuration of 1s2 2s2 2p6 3s1
Taking into account the definition of electronic configuration and the Aufbau principle, in an atom with the electron configuration of 1s²2s²2p⁶3s¹, there are 11 electrons.
Electronic configurationThe electronic configuration of elements is the arrangement of all the electrons of an element in energy levels and sublevels (orbitals).
There are 7 energy levels, numbered from 1 to 7, and in which the electrons are distributed, logically, in order according to their energy level. Electrons with less energy will spin at level 1.
Each level is divided into sublevels. These sublevels into which each level is divided can be up to 4. These 4 sublevels are called: s, p, d, f.
In the s sublevel there can only be a maximum of 2 electrons, in p there can be a maximum of 6 electrons, in the d sublevel 10 electrons and finally in the f sublevel there can be a maximum of 14 electrons.
At level 1 there is only one sublevel, which will be the s. In level 2 there are 2 sublevels, the s and the p. At level 3 there are 3 sublevels s, p and d. And in level 4 there are 4 sublevels, the s, the p, the d and the f.
Aufbau's principleThe Aufbau principle is a principle of atomic physics, which explains how electrons arrange themselves in their orbits around the nucleus of the atom.
This principle states that the filling of these orbitals occurs in order of increasing energy, that is, from orbitals of lower energy to those of higher energy.
The simplest of the sublevels is 1. If you fill the 1s, you can start filling the 2s. Once the 2s sublevel is satisfied, the 2p can start filling, and so on.
Amount of electronsIn this case, in an atom with the electron configuration of 1s²2s²2p⁶3s¹, there are 2+2+6+1= 11 electrons.
Learn more about an electronic configuration of an atom:
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1. Lithium, water, edible salt, chalk, Carbon, Lime, Nitrogen, Potassium, Oxygen,
Iodides, Iron, Chlorine, etc are some matters.
(a) Among the mentioned matters in the stem which one is called the Universal
Solvent? – Analyze the cause. 5 marks
Answer:
Explanation:
Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquidIt is water's chemical composition and physical attributes that make it such an excellent solvent. Water molecules have a polar arrangement of oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge. This allows the water molecule to become attracted to many other different types of molecules. Water can become so heavily attracted to a different compound, like salt (NaCl), that it can disrupt the attractive forces that hold the sodium and chloride in the salt compound together and, thus, dissolve it.
1 of 20
0 0%
In what form (solid, liquid or gas) is crude
oil found?
Enter your answer
Answer:
Gas
Explanation:
Because Crude oil can usually be found in the ground as a liquid and in the air is gas can be kerosene.
Which of the following notations is the correct noble gas configuration for Li
Noble gas configuration for Li : [He]2s¹
Further explanationIn an atom, there are levels of energy in the shell and sub-shell
This energy level is expressed in the form of electron configurations.
Lithium with atomic number 3, then the electron configuration:
1s²2s¹
And for noble gas configuration or it can be called Condensed electron configurations :
[He]2s¹
Answer:
[He]2s¹
Explanation:
When two balls collide, the momentum of the balls after the collision is explained by?
Answer:
(m1+m2)v
Explanation:
where m1 is the mass of the first body
m2 is the mass of the second body
v is the velocity
How many positively charged nucleons are in an atom of ^50 24Cr?
Answer:
positively charged nucleons are 24
Explanation:
Given element:
₂₄⁵⁰ Cr
The superscript before the symbol of the atoms is mass number
The subscript before the symbol is the atomic number
Cr is the symbol of the atom
Now,
Atomic number is the number of protons in an atom.
The protons are the positively charged particles in an atom.
For this specie, the positively charged nucleons are 24
Calculate the new volume if in a container there is a mass of gas that occupies a volume of 1.3L at a temperature of 280K. Calculate the volume when reaching a temperature of 303K.
Answer:
1.4 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V1) = 1.3 L
Initial temperature (T1) = 280 K
Final temperature (T2) = 303 K
Final volume (V2) =?
With the above data, we can obtain the new volume of the gas by using the Charles' law equation as shown below:
V1 /T1 = V2 /T2
1.3/280 = V2 /303
Cross multiply
280 × V2 = 1.3 × 303
280 × V2 = 393.9
Divide both side by 280
V2 = 393.9/280
V2 = 1.4 L
Thus, the new volume of the gas is 1.4 L
