Answer:
Our Sun (a star) and all the planets around it are part of a galaxy known as the Milky Way Galaxy.
Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?
Answer:
A. The temperature is always lower.
Explanation:
Just took the test on Edg. 2020
Give me branliest please
An LED lightbulb has an energy efficiency of 89%. This means that 11% of the electrical energy that goes into an incandescent lightbulb is used to produce light energy.
Which statement best explains what happens to the other 11% of the electrical energy that goes into the lightbulb?
The leftover electrical energy is destroyed
The leftover electrical energy is transferred into heat energy
The leftover electrical energy is transferred into chemical energy
The leftover electrical energy is transferred into potential energy
Answer:
The leftover electrical energy is transferred into potential energy.
Explanation:
I'm pretty sure this is the right answer or The leftover electrical energy is transferred into chemical energy
Explanation:
Answer:
The left over energy turns into potential energy:))
Explanation:
What happens to a liquid when you keep on cooling it until it changes?
Answer:
it turns into a solid
What is the hybridization of the C atoms in C2Cl4 ?
Answer:
sp2
Explanation:
Orbital hybridization is defined as the changes in the orbitals of atoms when they pair with electrons of other atoms to form chemical bonds.
C atoms in C2Cl4 or tetrachloroethene have a total of three bond pairs, two with each chlorine atom and one with other carbon atom and zero lone pairs. Thus, C atoms in C2Cl4 is sp2 hybridized.
Hence, the correct answer is "sp2".
The hybridization of the C atoms in C2Cl4 is sp² hybridized.
The concept of hybridization deals with the merging of atomic orbitals to produce fresh hybridized orbitals, which impact molecule geometry and bonding characteristics.
In the given compound, C2Cl4 (tetrachloroethene)
There is a substitution of all the hydrogen atoms attached to the organic compound ethene with chlorine to produce tetrachloroethene. The two carbon atoms are doubly bonded to each other with two chlorine attached to each of the carbon atoms diagonally given rise to a bond angle of 120°. Thus, the resulting hybridization of the C atom is sp² hybridized.
Therefore, we can conclude that the hybridization of the C atoms in C2Cl4 is sp² hybridized.
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Carbon decays every 5700 years. If you found a rock containing Carbon that has gone through 2.5 half lives, how old is that rock?
Answer:
14,250 years old.
Explanation:
First, multiply the two lifetimes. - 11,400.
Then, divide 5,700 in half for the 0.5 lifetime. - 2,850.
Lastly, add them all up. - 11,400 + 2,850 = 14,250 years old.
sorry if incorrect <3
thats what i understood XD
i need some help its due soon
Answer: it would be B
50 Points!! 25 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer:
f
a
c
e
b
reactant
b
f
a
e
d
c
b
Explanation:
Answer the following question.
Answer:
B) The north and south Poles
Explanation:
when dealing with magnets they have a negative and Positive charge on their south and north poles. Negative attacks with positive and positive with negative so both poles on each magnet should react to each other
This electron cloud model of aluminum has _______ energy levels with _______ electrons on its outer energy level. A) 1, 2 B) 2, 3 C) 3, 3 D) 4, 8
Answer:
C
Explanation:
Have anice day
This electron cloud model of aluminum has 3 energy levels with 3 electrons on its outer energy level. Thus option C is correct.
What is electron cloud?Electron cloud model is a type of model of an atom in which the atom consist of nucleus surrounded by a group of electrons. According to this model, the position of the electron at any given time is not known.
This model explains the zone of probability which describe the location of electron due to uncertainty principle. This model is described by Albert Einstein, Max Planck and Niels Bohr that electrons transmit energy and its properties that linked to light and energy.
The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. The total electrical charge of the nucleus is +Ze, where e is the elementary charge equals to 1,602 x 10-19coulombs.
Every electron is influenced by the electric fields produced by the positive nuclear charge and have (Z – 1) negative electrons in the atom.
Thus option C is correct.
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why must we include units with a measurement?
Answer:
Units are used to show if a certain calculation is on track.
Explanation:
For example, 5.1 inches is way shorter than 5.9 inches.
Which option is an example of a physical change?
Answer: if your quiz has these options to choose from - A: baking a cake B: grinding pepper C: lighting up a grill D: toasting bread, then it would be B: grinding pepper
Explanation: i took a quiz that had this question and i got it correct
Physical change of a substance include the phase change of the substance. Melting is an example of physical change where, a solid melts to form its liquid.
What is a physical change?The change in state or phase of a substance is called physical change such as, melting, boiling, crystallization etc. Whereas, the change that involves bond making or bond breaking is called a chemical change.
Nuclear decay is an example of chemical change a heavy unstable atom breaks into two stable nuclei by emitting certain radiation. Forming or breaking of chemical bonds are chemical changes.
Melting of a substances is its change from solid to liquid state. At this temperature, the solid state and liquid state of a substance comes in equilibrium.
This process does not involve any bond making or breaking hence, it is a physical change. Therefore, D is correct.
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Your question is incomplete. But your complete question probably was:
which option is an example of a physical change??
A breaking chemical bonds
B forming chemical bonds
C nuclear decay
D melting a substance
the difference between a scientific theory and a scientific law?
A scientific law is the description of an observed phenomenon. The explanation of a phenomenon is called a scientific theory.
2Mg(PO4)2
Mg =
-
P =
O =
Answer:
262.8577 g/mol
Explanation:
The molar mass and molecular weight of Mg3O8P2 is 262.858.
Answer:
The molar mass and molecular weight of Mg3O8P2 is 262.858.
Explanation:
could someone tell me if i’m correct
5) How do you describe a person who likes
inventing stories?
Plz Help ;_; :v
Answer:
One word for this is, raconteur - it means a person skilled in telling anecdotes. anecdotist. narrator, or storyteller
Explanation:
Why do nonmetals have a higher electronegativity?
Answer:
Nonmetals have more valence electrons and increase their stability by gaining electrons to become anions.
Answer: Because they are on the father side of the periodic table
Explanation: Electronegativity increases as you move from left to right on the periodic table
You have a graduated cylinder with 10 mL of water in it.
You add 300 g of lead weights, and the volume of the
water rises to 40 mL. What is the density of the lead?
Answer:
The answer is 10 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 300 g
volume = final volume of water - initial volume of water
volume = 40 - 10 = 30 mL
We have
[tex]density = \frac{300}{30} = \frac{30}{3} \\ [/tex]
We have the final answer as
10 g/mLHope this helps you
Hypothesize in your words how the heat is flowing through radiation.
Convert the following: 4.6L(liters) to ml(milliliters).
a. 0.46 ml
b. 46 ml
c. 46,000 ml
d. 4600 ml
Answer:
D
Explanation:
Answer:
D
Explanation:
1000 mL = 1 L
so
1000 × 4.6 = 4600
How do you find the mass number of an isotope?
Answer:
The mass number of an isotope is the total number of protons and neutrons in an atomic nucleus. If you know that a nucleus has 6 protons and 6 neutrons, then its mass number is 12. If the nucleus has 6 protons and 7 neutrons, then its mass number is 13.
Explanation:
According to the rock cycle, which of the following transitions are possible? Assume an unlimited number of steps.
A. )An intrusive igneous rock becomes a sedimentary rock.
B. )A sedimentary rock becomes soil.
C. )A metamorphic rock becomes an extrusive igneous rock.
D. )All of the above are possible.
Answer:
The answer is D
Explanation:
All of these solutions are correct.
Answer:
d
Explanation:
edge
What is a Newton unit?
Answer:
Units of force.
Explanation:
Issac Newton created the laws of motion and discovered gravity.
What is NOT an example of evidence of a super continent?
Question 5 options:
Fossil Record
Continuous Chain
Ocean Currents
Climate
A supercontinent is a landmass that consists of an aggregate mass of entire earth lithospheric landmasses. Pangaea was the last supercontinent that split about 200 million years ago.
The German geologist Alfred Wegener gave numerous pieces of evidence to support his theory of continental drift. These theories include fossil records, glacial chains, coal despites. In some places, he has also mentioned the presence of a similar climate type.Hence the option C is correct.
Learn more about the not an example of evidence of a supercontinent.
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Which of the following is a molecular formula?
MgCl₂
Al₂O₃
NO₂
CaO
Answer:
The molecular formula of a compound may be the empirical formula, or it may be a multiple of the empirical formula. For example, the molecular formula of butene, C4H8, shows that each freely existing molecule of butene contains four atoms of carbon and eight atoms of hydrogen. Its empirical formula is CH2.
Explanation:
How many protons? And how many electrons? (2pts)
How many valence electrons? (1pt)
Which noble gas does your element want to be like? (1pt)
Will the element give or gain electrons to form an ion? How many electrons? (2pts)
What charge will the element form? (1pt)
Will it be a cation or an anion? (1pt)
my element is arsenic btw and I NEED TO THIS TONIGHT BECAUSE GRADES ARE DUE
Plz help, have a quiz on this plz PLZ
Answer:
20.82
Explanation:
3) The mass of a piece silver is 10.5 g. If a sample of pure silver has a volume of 13 cm3, what is the
density?
Answer:
The answer is 0.81 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass of metal = 10.5 g
volume = 13 cm³
We have
[tex]density = \frac{10.5}{13} \\ = 0.8076923...[/tex]
We have the final answer as
0.81 g/cm³Hope this helps you
Answer:
0.807
Explanation:
mass/volume = density
10.5/13 = 0.807
An atom has 30 protons, 30 neutrons, and 30 electrons. What is the charge of the atom’s nucleus?
A: +30
B: +60
C: -30
D: -90
Answer:
+30
Explanation:
The nucleus holds both protons and neutrons. Since a neutron is neutral there is no charge. Protons are a positive charge. so the atoms nucleus is +30.
The charge on an atom's nucleus is the same as the number of protons in the nucleus. The charge on the nucleus of the atom is +30.
The nucleus houses positive particles called protons. Each proton carries a charge of +1.
The magnitude of charge of the nucleus is the same as the number of protons in the nucleus.
Since there are 30 protons, the magnitude of charge of the nucleus is expected to be + 30.
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5.00 C =? K
A.) 306 K
B.) 278 K
C.) 273 K
I have a few question please help its due in a few hours 1. Determine the specific heat of a certain metal if a 450 gram sample of it loses 34,500J of heat as its temperature drops by 97K
2. The temperature of a 25 gram sample of a certain metal drops by 103 K as it loses 2600 joules of heat. What is the specific heat of the metal?
3.What is the final temperature after 840 Joules is absorbed by 10.0g of water at 298K?
(please show steps)
Answer:
c = 0.79 j/g.K
c = 1 j/g.K
T2 = 123.1 K
Explanation:
1)
Given data:
Mass of metal = 450 g
Heat loses = 34,500 j
Temperature drop = ΔT = 97 K
Specific heat of metal = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
34500 j = 450 g ×c × 97 K
34500 j = 43650 g.K ×c
c = 34500 j/43650 g.K
c = 0.79 j/g.K
2)
Given data:
Mass of metal = 25 g
Heat loses = 2600 j
Temperature drop = ΔT = 103 K
Specific heat of metal = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
2600 j = 25 g ×c × 103 K
2600 j = 2575 g.K ×c
c = 2600 j/2575 g.K
c = 1 j/g.K
3)
Given data:
Mass of water = 10 g
Heat absorbed = 840 j
Initial temperature drop = 298 K
Final temperature = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
840 j = 10 g ×4.18 j/g.K × [T2 - 103 K]
840 j = 41.8 J/K × [T2 - 103 K]
840 J/41.8 J/ K = T2 - 103 K
20.1 k = T2 - 103 K
T2 = 20.1 K + 103 K
T2 = 123.1 K
