Answer:
nobel gases ,non metals and metaliods
How many moles are present in 5.24 x 1023 molecules of CH4?
Answer:
0.807 moles
Explanation:
No of molecules = No of mole × Avogadro's number
No of mole = No of molecules / Avogadro's number
No of mole = 5.24×10^23/6.02×10^23
0.870 moles
Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar.
Use the information given to correctly complete the sentence.
A scientist observes that a zebra ran 54 yards in 135 seconds.
The zebra ran at a rate of
feet per minute. I LOVE YOU RO
Answer:
it's answer is 24 yards
hope it helps you friend
tbhwrverhbvjhhdshvuyf7474638783269
For an ideal gas, which two variables are directly proportional to each other (if all other
conditions remain constant)?
1. T and n
2. V and n
3. V and T
Answer:
3. V and T
Explanation:
For an ideal gas the volume and temperature remains directly proportional even if other conditions are constant.
This is the premise of the Charles's law.
Charles's law propounded by Jacques Charles found the relationship between the volume and temperature under constant pressure and predicted the absolute scale of temperature.
His law states that;
"The volume of a fixed mass (mole) of a gas varies directly as its absolute temperature if the pressure is constant".
So;
V ∝ T (P, n constant)
Order the following atoms from smallest to largest atomic radius: C, N, P
Answer:
N ∠ C ∠ P
Explanation:
Atomic radius:
It is define as the distance from nucleus of an atom the outer most electronic shell.
As we move down the group atomic radii increased because of increase of atomic number. Electrons are added in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
When we move from left to right across the periodic table electron are added in the same shell at the same time protons are also added in the nucleus hence positive charge is going to increase and this effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus and atomic radii decreases.
Carbon and nitrogen are present in period 2 while phosphorus is present in period 3 thus phosphorus has largest atomic radii. Carbon and nitrogen are present in same period but nitrogen is more right as compared to the carbon which means nitrogen has one more valence electron thus its size is smaller than carbon.
Values of atomic radii.
P = 98pm
C = 67pm
N = 65 pm
N ∠ C ∠ P
What are the four functions of cell division?
Answer:
Cellular division has three main functions: (1) the reproduction of an entire unicellular organism, (2) the growth and repair of tissues in multicellular animals, and (3) the formation of gametes (eggs and sperm) for sexual reproduction in multicellular animals.
Answer:
There are four key reasons why a cell may be required to divide mitotically:
Tissue repair / replacement.
Organismal growth.
Asexual reproduction.
Development (of embryos)
How are rocks formed? Explaine in 500 words or less.
Explanation:
Rocks are formed from aggregates of minerals. There are three different types of rocks and they are formed by different processes. Igneous rocks are formed by the cooling and solidification of magma within or on the earth crust. Sedimentary rocks are formed from pre-existing rocks by the lithification of sediments brought into a basin of deposition. Metamorphic rocks are changed rocks that have been mineralogically altered.
Different rocks form under specific conditions and environment. But rocks are connected to one another through the rock cycle. The rock cycle shows that rocks can transition from one form to another.When 125g zinc carbonate is heated, 81g zinc oxide is produced.
Calculate the mass of carbon dioxide produced.
Mass of carbon dioxide=___g
Answer:
Mass of carbon dioxide= 44 g
Explanation:
Zinc carbonate → Zinc oxide + carbon dioxide
125 g = 81 g + X
X = 125 g-81 g
X = 44 g
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
Screen of monitors and televisions are made by ?
A- red dots
B- red , yellow and green dots .
C- red , green and blue dots
D- white dots
Answer:
C
Explanation:
This is a correct answer i think soo
You use a battery to power a small hand-held fan to keep cool in the summer what way is the energy transformed?
Answer:
Chemical to electrical to kinetic energy
Explanation:
In a battery-operated fan, first, the chemical energy stored in the battery is converted to electrical energy within the fan and then the electrical energy, in turn, is converted to kinetic energy which makes the blades of the fan rotate. The rotation of the fan creates a breeze that forces the evaporation of sweat molecules from the surface of the skin and causes cooling in return.
. A skydiver jumps from an airplane and opens his parachute. At some point during his fall, the downward force of gravity on the skydiver is equal to the upward force of drag on the parachute. Which of the following best describes the skydiver's motion at this point? The skydiver is gaining speed downward. The skydiver is moving at a constant speed. The skydiver is decreasing in speed.
The upward drag and downward force is equal for the skydiver when he jumps down from the plane. Thus, he experiences a constant speed through out his motion.
What is gravitational force?Gravitational force is a kind of force by which a body attracts other objects into its center of mass. Force exerted by the body depends on the mass and distance to it.
Earth pull every objects into its surface by gravitational fore of attraction. For moving body the the gravitational force acting downward have an acceleration due to gravity.
The skydiver experiences a force upward by the drag of a the parachute. When this force becomes equal to the downward fore of gravity, then his speed will be constant thus, no gain or lose for speed.
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How is hydroelectric power used to generate energy? (Add a real world example) !I WILL GIVE BRAINLIEST!
Answer:
an example is a dam
Explanation:
dams generate electricity, the water that flows through the dam have propellers that when turned send up energy to the generators which create power.
I'm very confused please help
Answer:
the food chain you mean
Explanation:
pollution than mosquitoes then alligators
it takes a slug 20 minutes to travel from the grass to the trash can a trip of 15 meters. how far could the slug travel in 60 minutes
Answer:
45 meters
Explanation:
Did the math
Why is there a leap year every four years?
Answer:
Because we are not perfect
Explanation:
This day is added to the calendar as a corrective measure, because the Earth does not orbit the sun in precisely 365 days.
How many grams of Aluminum Oxide are produced when 3.64 g of Aluminum reacts with an excess of Oxygen?
4Al + 3O2 → 2Al2O3
_ grams of Al2O3 (round to 3 sig figs)
Answer:
6.877649 or 6.88 grams of Aluminum OxideExplanation:
- If there are 4 moles of Al that equals 107.926156 grams of 4Al.
- If there is 2 moles of Al2O3 that equals 203.9226 grams.
So...
If 107.926156 grams of 4Al equals 203.9226 grams of 2Al2O3 then, 3.64g of Al equals x.
When 6.8776g of aluminium reacts with an excess of oxygen, 6.8776g of aluminium oxide are produced.
What is aluminium?Aluminium is a silvery-white metal with atomic number 13 in the periodic table.
What is aluminium oxide?Aluminium oxide is a chemical compound of aluminium and oxygen with the chemical formula Al₂O₃. It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium(III) oxide.
The synthesis of Aluminium oxide can be done by heating aluminium in the presence of oxygen. In this reaction, 4 moles of aluminium react with 3 moles of oxygen leading to the formation of 2 moles of aluminium oxide.
4Al + 3O2 → 2Al2O3
If there are 4 moles of Al that equals 107.926156 grams of 4Al
If there are 2 moles of Al2O3 that equals 203.9226g
If 107.9261 grams of 4Al equals 203.9226 grams of 2Al2O3 then, 3.64g of Al equals x
107.9261 / 3.64 = 203.9226 / x
(107.9261) x = (203.9226) 3.64
107.9261 x = 742.2782
dividing both LHS and RHS by 107.9261,
107.9261/107.9261x = 742.2782/107.9261
x = 6.8776g
Hence, 6.8776g of aluminium oxide are produced.
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27. How was the design of the Chernobyl plant different than most modern reactors?
a. The containment building had a dome shape to minimize impact of explosion.
b. The plant was built close to a river to have a constant supply of fresh water.
c. Graphite was used instead of water as a moderator solution in the reactor.
d. The plant design was not significantly different than other reactors.
Answer:
I think its C
Im not sure tho hehe
For any substance, the melting point and freezing point are at the same temperature. TRUE OR FALSE
Answer:
This is false.
Explanation:
This is false because water freezes at 32 degrees faraheint and carbon would freeze at a different temperature.
Which sequence correctly ranks elements from largest to smallest atomic radius?
(A.) Br, As, K
(B.) Cs, Ba, At
(C.) F, S, As
(D.) Mg, Ca, Ba
Answer:
\A.
Explanation: Bromine and arsenic have the same atomic radius, which is 115 and Potassium has an atomic radius of 220.
Democritius thought that
are the smallest particles of matter.
Please give 1 answer.
A.
Electrons
B.
Protons
C.
Neutrons
D.
Atoms
WILL GIVE BRAINLIEST
Answer: pretty sure it B
Explanation:
Answer:
the answer is b hope this helps
Explanation:
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18. Which metal is capable of forming more than one cation?
Li
Ba
Al
Sn
Answer:
Li
Explanation:
Describe how the composition of the upper mantle is different from the lower mantle?
a. The upper mantle is made of solid rocks and lower mantle is made of melted rocks and minerals
b. The upper mantle is made of melted rocks and minerals and lower mantle is made of solid rocks
c.The upper mantle is made of lava and the lower mantle is made of magma
Answer:
b
Explanation:
Answer:
it is B hope I helped
=
Explanation:
Explain how early cultures contributed to the area of earth science.
Answer:
cultures that contributed to modern scientific study ... Identify possible source of Earth's magnetic field ... turn it into glucose, animals eat plants, CO2 is released when when animal poops ... Describe one way ecosystems respond to change.
Explanation:
2.
As products are formed in the reaction
NH4Cl(s) + 3.5 kcal
H2O
NH4+(aq) + Cl (aq),
the entropy of the system
(1) decreases and heat is absorbed
(2) decreases and heat is released
(3) increases and heat is absorbed
(4) increases and heat is released
The entropy of the system increases and heat is absorbed in this chemical reaction.
What happen when NH4Cl reacts with water?When ammonium chloride NH4Cl reacts with water, it absorb energy for the surrounding and decomposes into its component ions such as NH4+ and Cl- so we can conclude that increases occur in the entropy of the system and heat is absorbed.
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Which is caused by the refraction of waves?
A. Two sounds canceling each other out
B. Seeing yourself in a mirror
C. Something looking bent under water
D. Sound bending around a door
Answer:
C: Something looking bent under water.
8. How many milligrams of iron are delivered from a 250. mg tablet of FeSO4.7H20
Answer:
[tex]molar \: mass \: of \: FeSO _{4}.7H _{2}0 = (56 + 32 + (16 \times 4) + (7 \times 18)) \\ = 278 \: g \\ \\ (278 \times 1000) \: mg \: of \: FeSO _{4}.7H _{2}0 \: contains \: (56 \times 1000) \: mg \: of \: Fe \\ 250 \: mg \: of \: FeSO _{4}.7H _{2}0 \: contain \: ( \frac{250 \times 56 \times 1000}{278 \times 1000} ) \\ = 50.35 \: mg \: of \: Fe[/tex]
The mass of Fe delivered by 250 mg Iron sulfate heptahydrate has been 50.35 mg.
The molar mass of the compound has been the sum of the mass of each element present in the compound. The given compound is iron sulfate heptahydrate. The compound has molar mass 278 grams.
1 mole of compound has been consisting of 1mole of iron.
278 grams Iron sulfate = 56 grams Fe
278,000 mg Iron sulfate = 56,000 mg Fe.
The mass of iron in 250 mg compound can be given as:
278,000 mg Iron sulfate = 56,000 mg Fe
[tex]\rm 250\;mg \;Iron\;sulfate\;=\;\dfrac{56,000}{278,000}\;\times\;250[/tex]
250 mg Iron sulfate tablet = 50.35 mg Fe.
The mass of Fe delivered by 250 mg Iron sulfate heptahydrate has been 50.35 mg.
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The power has gone out and you find a flashlight that uses batteries. When you turn on the flashlight, you are transforming:
The Missouri River is a ______ of the Mississippi River.
Answer:
The missouri River is a Longesr tributary of the Mississippi River.
The Missouri River is tributary of the Mississippi River.
What is the Missouri River?The Missouri River is known as the longest river in the United States. Missouri flows east and south for 2,341 miles before mixing with the Mississippi River north of St Louis, Missouri.
The river drains include parts of ten U.S. states and two Canadian provinces although a tributary of the Mississippi, the Missouri River is marginally longer and has a comparable volume of water. When combined with the lower Mississippi River, it creates the world's fourth-longest river system.
People depend on the Missouri River and its tributaries as a source of transportation and sustenance. The Missouri River was the main route for the westward expansion of the U.S. during the 19th century.
During the 20th century, the Missouri River was developed for irrigation, flood control, and the generation of hydroelectric power. Fifteen dams formed the stem of the river, with hundreds more on tributaries.
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Hello! Does anyone know how the structural formula of 2, 2 dimethyl butane is? Please help!
Answer:
I have it.
Explanation:
Which characteristic do euglenoids and algae share?
Both are fungus-like protists.
Both can be autotrophic.
Both have whip-like tails.
Both are decomposers.
To solve this we must be knowing each and every concept related to autotroph. Therefore, eugenides and algae, both can be autotrophic. The correct option is option B.
What is autotroph?An creature that can make its own sustenance out of inorganic materials is known as an autotroph. Contrarily, heterotrophs are species that can't make their own nutrition and must eat other organisms in order to survive.
In contrast to autotrophs, heterotrophs are unable to manufacture their own nourishment. Heterotrophs need to consume organic material in order to produce the nutrients needed for life, not inorganic. Eugenides and algae, both can be autotrophic.
Therefore, Eugenides and algae, both can be autotrophic. The correct option is option B among all the given options.
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