Answer:A. Because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits
Explanation: This is because the The periodic table of elements is designed according to the number of shells from up going down together with their increasing number of atomic numbers, Now only Hydrogen and Helium have one shell and are therefore the only two elements that should be placed in the first period .
Also note that in filling of their s-orbital, the maximum number of electrons that it can contain is 2 as in 1s²
See related answer here: https://brainly.com/question/9894635
12. A year on any planet is the number of days it takes for the planet to complete
one orbit around the Sun. It takes 365 days for Earth. It takes 365 days for the
Earth to revolve around the Sun, so on Earth a year is 365 days. How old are
you in Mars-years?
Step 1: Calculate how many Earth days old you are.
Step 2: Divide that number the number of days it takes Mars to complete an orbit.
Step 3: Explain your answer
Answer: Well, 365 days is about how long it takes for Earth to orbit all the way around the Sun one time. It's not exactly this simple though. An Earth year is actually about 365 days, plus approximately 6 hours.
Write the reaction to prepare C2H5Br from (image attached)
a) alcohol using PX3
b) Alcohol using HX
The equations for the preparation of C₂H₅Br from alcohol using PX₃ and HX are shown in the attachment below.
a) Preparation of C₂H₅Br from alcohol using PX₃
In PX₃, X refers to the halides (F, Cl, Br etc.). Since the desired ethyl halide is ethyl bromide (C₂H₅Br) , then X in PX₃ will be Br. Therefore, PBr₃ will be used in the reaction as shown in the attachment below.
b) Preparation of C₂H₅Br from alcohol using HX
Also, In HX, X refers to the halides (F, Cl, Br etc.). Since the desired ethyl halide is ethyl bromide (C₂H₅Br), then X in HX will be Br. Therefore, HBr will be used in the reaction as shown in the attachment below.
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Someone plz help me :(
Answer:
b. the development of new vaccine prevents disease from spreading
what would be the atomic mass of Carbon-14
Please help due at 11:00
Which of the following correctly
describes a physical change in
matter?
A. matter keeps its chemical makeup, but a
change in size, shape, volume, or state of matter
occurs
B. particles leave and a new substance is made
C. a new substance is formed by atoms
combining in different ways
Answer:
the option A is right matter keeps it's chemical makeup like size shape volume and state
While camping, you make a snack over a campfire. You roast a marshmallow over the campfire until it is browned and put it between some chocolate and graham crackers. When you take a bite, you notice that the chocolate and marshmallow have melted slightly. Which statement correctly identifies a part of this process as a physical or a chemical change?
Answer:
It is melting which is a physical change.
Explanation:
[tex].[/tex]
The process is a physical change because the chocolate and marshmallow melted.
You included no options but this is a physical change because the question mentioned that the chocolate melted.
A physical change occurs when the state of matter changes but the chemical properties remain the same. Physical changes include:
Melting because only the state changes from solid to liquid Freezing because only the state changes from liquid to solidIn conclusion therefore, the chocolate and marshmallow melted and so underwent a physical change.
Find out more at https://brainly.com/question/17931044.
Dante loves taking care of the chickens on his farm. He feeds them rice everyday. His Grandma told him that he should feed them corn everyday instead of rice because it will make them grow fatter.
He decides to do an experiment to test what type of food will make his chickens fatter. Before the experiment, the chickens weigh an average of 5 pounds. David makes two groups of chickens. He feeds Group A rice everyday, and feeds Group B corn everyday. After one month, David weighs the chickens to see if they gained any weight. Group A weighs an average of 5 pounds and group B weighs an average of 7 pounds. What is the test variable (independent variable) in this experiment? *
Answer:
The independent variable in this experiment is what he feeds the chickens (rice or corn).
Explanation:
The independent variable is the variable the experimenter manipulates or changes.
A ball hits a wall. What is true about the magnitude of the force experienced by the ball compared with the force experienced by the wall?
ОА.
The ball experiences more force than the wall.
OB. The ball experiences less force than the wall.
O c.
The ball and the wall experience the same force.
OD
The ball experiences half the force of the wall.
Q. Calculate the number of atoms in each of the following (i) 52 moles of Ar (ii) 52 u of He (iii) 52 g of He
The number of atoms will be 3.131 x [tex]10^{25}[/tex], 7.8286 x [tex]10^{24[/tex], and 7.8286 x [tex]10^{24[/tex] atoms respectively.
Number of atomsThere are 6.022 x [tex]10^{23}[/tex] atoms in 1 mole of every substance.
52 moles of Ar will contain 52 x 6.022 x [tex]10^{23}[/tex] = 3.131 x [tex]10^{25}[/tex] atoms
52 u of He = 52/4 = 13 moles of He.
13 moles of he = 13 x 6.022 x [tex]10^{23}[/tex] = 7.8286 x [tex]10^{24[/tex] atoms
52 g of He = 52/4 = 13 moles of He.
13 moles of he = 13 x 6.022 x [tex]10^{23}[/tex] = 7.8286 x [tex]10^{24[/tex] atoms
More on number of atoms can be found here: https://brainly.com/question/8834373
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1. The number of atoms in 52 mole of Ar is 3.13×10²⁵ atoms
2. The number of atoms in 52 u of He is 7.83×10²⁴ atoms
3. The number of atoms in 52 g of He is 7.83×10²⁴ atoms
Avogadro's hypothesis1 mole of substance = 6.02×10²³ atoms
1. How to determine the number of atoms in 52 mole of Ar1 mole of Ar = 6.02×10²³ atoms
Therefore,
52 mole of Ar = 52 × 6.02×10²³
52 mole of Ar = 3.13×10²⁵ atoms
2. How to determine the number of atoms in 52 u of He4 u of He = 1 mole
Thus,
52 u of He = 52 / 4
52 u of He = 13 moles
From Avogadro's hypothesis,
1 mole of He = 6.02×10²³ atoms
Therefore,
13 moles of He = 13 × 6.02×10²³
13 moles of He = 7.83×10²⁴ atoms
Thus,
52 u of He = 7.83×10²⁴ atoms
3. How to determine the number of atoms in 52 g of He4 g of He = 1 mole
Thus,
52 g of He = 52 / 4
52 g of He = 13 moles
From Avogadro's hypothesis,
1 mole of He = 6.02×10²³ atoms
Therefore,
13 moles of He = 13 × 6.02×10²³
13 moles of He = 7.83×10²⁴ atoms
Thus,
52 g of He = 7.83×10²⁴ atoms
Learn more about Avogadro's number:
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True or False:
If a chemical is used in a chemical reaction as a reactant but no
products are formed and nothing changes about the chemical,
it is safe to assume it has no chemical properties.
Answer:
i think true ..........................................
NEED IT ASAP
1) Plants need water for______in order to make food. water is needed more for _____, to maintain body temperature and transport nutrients.
Answer:
Hi Lovelys!!
Answer down below!!
Explanation:
Answer: Plants need water for photosynthesis in order to make food. Water is needed more for cooling, to maintain body temperature and transport nutrients.
Reason: Plants need water for photosynthesis. Water also helps move nutrients from the soil into the plant. Too little water can cause a plant to wilt or droop. Too much water can cause a plant's roots to rot. Plants are about 80-95% water and need water for multiple reasons as they grow including for photosynthesis, for cooling, and to transport minerals and nutrients from the soil and into the plant.
Hope this helps!! =3
Have a wonderful day, evening, or night!!
This is my cookie >:( you cannot have it
(Also the question of the cookie is it homogeneous or heterogeneous? DONT EAT IT [its mine])
a kilogram of lead occupies a much smaller volume than a kilogram of water, because_____ has a much higher density
Answer:
lead
Explanation:
As we know the formula
[tex]\boxed{\sf Density=\dfrac{Mass}{Volume}}[/tex]
[tex]\\ \sf\longmapsto Volume=\dfrac{Mass}{Density}[/tex]
Hence object having less density occupy higher volumeThe radioactive elements used in nuclear
power plants are plutonium and
A thoriun B. tritium C. radon
D. radium E. uranium
Gimme ur bath water plzzzz
Answer:
plzz can you explain in detail this Q
How many micrograms (ug)
are equal to 0.000520 grams?
[?] ug
Answer:
520
Explanation:
This is easy
Convert 355 degrees C to K.
Answer: 628.15 K
Explanation:
Add 273.15 to any temperature in Celsius to get it in kelvin
I.Molten Nacl conducts electricity due to the presence a
a-free electrons
b. free ions
c. Free molecules .
d. Atoms of sodiium and chloride.
Answer:
Hello! Your answer would be BELOW
Explanation:
So a molten salt powers electricity. Hence, molten sodium chloride conducts electricity due to the presence of free ions. So, the correct answer is option D. Atoms of sodium and chloride.
Hope I helped! Hope you make an 100%
-Amelia♥
Pls helllllpppppp!!!!!
how was the interior of the atom was experimentally dicovered?
Answer:
Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup."
What subatomic particle is in constant movement around the nucleus forming a cloud like appearance
Answer:
Electron
Explanation:
what is a big plants
In the world
who can say
I want a answer
Answer:
Jupiter
Explanation:
Fifth in line from the sun, Jupiter is, by far, the largest planet in the solar system.
Your friend's pet hamster weighs 152 grams on Earth. If that hamster traveled to space, what is its weight and why? Answer in complete sentences,
Answer:
force of gravity 1.2 N
Explanation:
dont know for sure but here's what I got
A rectangular object measures 3 cm x 2 cm x 1 cm and it has a mass of 4 g. What is the density of
this rectangular object?
Answer:
Density of the rectangular object = 4 / 6 = 0.67g/cm³
Explanation:
First find the volume of the rectangular object.
Volume of the rectangular object = 3 x 2 x 1 = 6cm³.
Density of an object = mass of the object / volume of the object
Therefore,
Density of the rectangular object = 4 / 6 = 0.67g/cm³
Match the parts of the skeletal system with its level of organization.
1. Thigh bone
2. living cell
3. Bones cells working together
4. All the bones, cartilage, and ligaments
To:
A. Organ system
B. Organ
C. Tissue
D. Cell
Hi, these are the answers:-
Thigh bone → Organ
Living cell → Cell
Bone cells working together→ Tissue
All the bones, cartilages and ligaments→ Organ System
Hope it helps you...
Pls mark brainliest if it helps you...
(Answered by Benjemin)
what are elements?????
An element is a substance that cannot be broken down into any other substance.
I hope this answer helps you..
What method of measuring volume of these objects would be most accurate and why?
Answer:
where are the object
Explanation:
can you have a look at your question
You are given 2 balls that are made of the same material. They are also the same size and color. One is hollow and one is solid. Determine the physical property that could be used to identify the ball as a solid.
Group of answer choices
boiling point
solubility
pH
density
Answer:density
Explanation:
it’s how’s how dens the ball is
Atoms are bonded together due to the mixing of atomic orbitals to create mixed or hybrid orbitals. This is an example of a(n)?
a. problem
b. law
c. theory
d. experiment
What is the formula mass of a compound with 2 aluminum atoms and 3 oxygen atoms?
Answer:
[tex]\boxed {\boxed {\sf 101.96 \ amu}}[/tex]
Explanation:
Formula mass is the sum of the atomic masses of the atoms in a molecule. Essentially, it is the mass of 1 molecule of a compound.
We are given a compound containing 2 aluminum atoms and 3 oxygen atoms. We will use the Periodic Table to look up the atomic masses of the 2 elements in the compound.
Al: 26.981538 amuO: 15.999 amuThese are the atomic masses of 1 atom of the element. Remember we have 2 Al atoms and 3 O atoms. We multiply the element's atomic mass by the number of atoms of that element in the compound.
2 Al: 26.981538 amu *2= 53.963076 amu 3 O: 15.999 amu * 3=47.997 amuNow we add the atomic mass of 2 Al atoms and 3 O atoms.
53.963076 amu + 47.997 amu = 101.960076 amuWe may want to round this answer to the hundredth place. The 0 in the thousandth place tells us to leave the 6 in the hundredth place.
101.96 amuThe formula mass of a compound with 2 aluminum atoms and 3 oxygen atoms is approximately 101.96 atomic mass units.
