Answer:
B B B B B B B B B B B B B B B B B B B B B B B B
b is not cell theory
which layer of the earth has the lowest density
Answer:
lithosphere
Explanation:
Earth's interior layers are ordered by density. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the least dense layer is the lithosphere, particularly the continental lithosphere.
The crust is the layer of the earth with the lowest density.
The crust is the rock layer that is the lightest and most buoyant on Earth. 41% of the Earth's surface is covered by continental crust, with a quarter of that covered by ocean floor. The thickness of the continental crust is 20 to 80 kilometers. Four billion years of Earth's history are stored in its rocks.
The crust is the outermost layer of the Earth, and it is only about 5-70 km deep. The mantle is the layer beneath the crust, which is about 2,900 km thick and has a thickness that varies. The core is divided into two sections: the inner core, which is solid, and the outer core, which is liquid. The Earth's surface is made up of several plates, which are continuously changing due to forces within the Earth.
Know more about crust:
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Why is water considered a pure substance but orange juice a compound?
Answer: A mixture is when two or more substances combine physically together. However, in water, two hydrogen atoms combine with one oxygen atom chemically, forming a new substance that has properties different from hydrogen alone or oxygen alone. Therefore, water is not a mixture; it is a compound and it is pure. A Orange juice contains particles of solid (pulp) as well as liquid; it is not chemically pure. B Because its composition is not uniform throughout, orange juice is a heterogeneous mixture. A Aluminum oxide is a single, chemically pure compound. A Selenium is one of the known elements.
Hope this helps :)
!!PLS HELP ASAP!!
In the process of creating ammonia (NH3), nitrogen gas (N2 ) is combined with hydrogen gas (H2) that is extracted from hydrocarbons such as methane (CH4) or propane (C3H8) gas. Manufacturers must determine the appropriate amount of each reactant so as to produce the highest yield of product.
The balanced reaction for ammonia is below:
N2+2H3→2NH3
Explain why determining the limiting reactant is important to a manufacturer trying to produce NH3 and the effect of running out of reactant.
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Name the type of reaction shown:2C4H10+13O2=8CO2+10H2O
Answer: It is AN combustion
reaction.
Explanation:
Which of the following could affect infiltration of water into the surface of the soil? Explain in detail.
I. Concrete sidewalks
II. Parks and gardens
I WILL MARK AS BRAINLIST
Answer:
I. Concrete sidewalks
Explanation:
One of the factor that affects the infiltration of water into the surface of the soil is the use of concrete sidewalks.
A concrete sidewalk prevents water from infiltrating down into the soil profile. Infiltration deals with the movement of water into the soil or ground. It is the major source of ground water recharge. Also, infiltration makes water available for plants.Concrete is impermeable and non - porous media
When concrete pavements are used, water will not be able to move into the ground. They run on the surface and collects into nearby streams and water bodies.
Pb has an atomic number of 82. It has an isotope Pb-207. The mass number is 207.
How many protons are in Pb 207?
O 82
125
O 207
none of these
Answer:
Number of protons = 82
Explanation:
Given data:
Atomic number of Pb = 82
Mass number of Pb-207 = 207
Number of protons = ?
Solution:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
Atomic number of Pb = number of protons or electrons
82 = number of protons or electrons
Mass number = Number of protons + number of neutron
207 = 82 + number of neutron
Number of neutrons = 207 - 82
Number of neutrons = 125
The mass per mole of a substance is called its molar mass.
True or false
The molar mass of a substance is the mass in grams of one mole of that substance. This mass is given by the atomic weight of the chemical unit that makes up that substance in atomic mass units....
hope that helps
so i think that it is false because base on the statement above si the decision is yours just read it thanx
Categorize the following reaction: CH4 + O2 ---> CO2 + H2O *
Synthesis Reaction
Combustion Reaction
Replacement Reaction
Decomposition Reaction
Answer:
combustion reaction
Explanation:
combustion reactions have the end products H20 and C02
CO2(g) + H2O(I) - -> C6H12O6(s) + O2(g)
How many of the chemicals in the equation above are aqueous? #only
Answer:
For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but PhC2H5 + O2 = PhOH + CO2 + H2O will; Compound states [like (s) (aq) or (g)] are not required. If you do not know what products are enter reagents only and click 'Balance'. In many cases a complete equation will be suggested.
Explanation:
What must be present in order for
electricity to flow?
A. positive and negative charges
B. an electrical outlet
C. Neutrons
D. water
If one person reacts to something in a certain way, that means ALL people will react to the
same situation in the same way (Johnny gets stung by a bee, now he kills every bee he sees).
O TRUE
O FALSE
Hi there,
My answer would be False.
Please mark
Thanks
The statement is false that if one person reacts to something in a certain way, that means ALL people will react to the same situation in the same way (Johnny gets stung by a bee, now he kills every bee he sees).
What makes this statement false?According to this question, if one person reacts to something in a certain way, that means ALL people will react to the same situation in the same way.
An example then states that Johnny gets stung by a bee and begins to kill every bee he sees.
This statement is false because when Johnny gets stung by a bee, everyone should react to the situation the same way Johny Johnny did.
Learn more about false statements at: https://brainly.com/question/24701431
Which part of the wave is the arrow pointing to?
A. Rarefaction
B. Compression
C. Wavelength
D. Crest
Answer:
A. Rarefaction
Explanation:
Which of the following pairs of compounds will react to form a precipitate? Why?
calcium chloride and silver nitrate
sodium iodide and potassium chloride
calcium chloride and sodium nitrate
Answer:
calcium chloride and silver nitrate
Explanation:
A precipitate is often formed in a double replacement reaction when the reaction yields an insoluble product.
Consider the reaction between calcium chloride and silver nitrate;
CaCl2(aq) + 2AgNO3(aq) -------->2AgCl(s) + Ca(NO3)2(aq)
AgCl is insoluble in water, hence the reaction leads to the formation of a precipitate.
Choose the formula for calcium silicate.
A: CaSiO3
B: Ca(SiO3)2
HELP ME PLEASE. I DONT HAVE MUCH TIME LEFT!
Select the correct answer. Which molecule has polar bonding and is nonpolar? OA H₂O OB. BF3 OC. NH3 OD. NC13 O E. CH₂Cl2
Answer:
B. is your correct answer
Explanation:
chemist's found that a complex reaction occurred in three steps. the first step takes 2.5140 * 10^2s to complete, the second step takes 1.40 * 10^-1s, and and the third step takes 7.397 * 10^1s. what is the total amount of time elapsed during the reaction?
Answer:
The total amount of time elapsed during the reaction is 2.5227 × 10²s
Explanation:
The total amount of time elapsed in this reaction would be to add the (three) individual time taken together: t = t₁ + t₂ + t₃
(2.514 × 10²s) + (1.4 × 10⁻¹s) + (7.397 × 10¹s) = 252.2797 ⇔ 2.5227 × 10²s
It is easy to know what someone is thinking by the way the behave (act):
TRUE
FALSE
2C8H18 + 25O2 → 16CO2 + 18H2O reaction type
Answer:
Combustion
---
Answer:
This is not a redox reaction. It is an example of combustion.
Explanation:
what is the systematic name of NaCl
Answer:
The answer is Sodium chloride.
Na is sodium and Cl is chlorine.
4Al + 3O2 —> 2Al2 O3
10.7g of powdered Al is placed into a container containing 10.7g O2. What is the limiting reactant? How many grams of aluminum oxide can be produced? Calculate the mass of excess reactant that remains after the reaction is complete
Limiting reactant : Al
Al2O3 produced = 18.36 g
mass O2 remains = 11.904 g
Further explanationGiven
Reaction
4Al + 3O2 —> 2Al2O3
10.7 g O2
Required
Limiting reactant
mass Al2O3
Mass of excess reactant remains
Solution
mol Al : 10.7 : 27 = 0.396
mol O2 = 10.7 : 32 = 0.334
1. limiting reactant
mol : coefficient of Al : O2 = 0.396/4 : 0.334/3 = 0.099 : 0.111
Al as a limitng reactant(smaller ratio)
2. mass Al2O3
mol Al2O3 based on Al : 2/4 x 0.396 = 0.18
mass Al2O3(MW=102 g/mol) = 0.18 x 102 = 18.36 g
3. mass O2 remains
mol O2 reacted : 3/4 x 0.396 = 0.297
mol O2 remains = 0.669 - 0.297 =0.372
mass O2 remains = 0.372 x 32 = 11.904 g
Calculate the number of formula units of KMnO4 in 100 mols
Answer:
100 moles of KMnO₄ contain 602.2 × 10²³ formula units.
Explanation:
Given data:
Number of moles of KMnO₄ = 100 mol
Number of formula units = ?
Solution:
The given problem will be solved through Avogadro number.
1 mole contain = 6.022 × 10²³ formula units
100 mol × 6.022 × 10²³ formula units / 1 mol
602.2 × 10²³ formula units
Thus, 100 moles of KMnO₄ contain 602.2 × 10²³ formula units.
Can someone help me with questions 4-5
21 points
4. describe three ways carbon dioxide was removed from the Earth's atmosphere.
Answer: Forests: Photosynthisis helps clear carbon dioxide naturally, Soils naturally store carbon, but agricultural soils are running a big deficit due to intensive use. Because agricultural land is so expansive, Bio-energy with Carbon Capture and Storage (BECCS) is another way to use photosynthesis to combat climate change. However, it is far more complicated than planting trees or managing soils — and it doesn’t always work for the climate.
5. Explain why there is now 21% Oxygen in the Earth's atomosphere compaired to little or no Oxygen in the Earth's atmosphere 4.5 billion years ago.
Answer: cientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence.The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.
Sorry its soooo long TwT
Explain what happens as a puddle dries after a rainstorm.
Rank the following elements from highest to lowest ionization energy.
I, Cl, F, Br
Help plsssss:(
Answer:
F
Cl
Br
I
Explanation:
Br=11.81...
Cl=12.96...
F=17.42...
Iodine=10.45
calculating kinetic energy 1200kg car moving at 10
Answer:
60000J
Explanation:
Given parameters:
Mass of car = 1200kg
Speed = 10m/s
Unknown:
Kinetic energy = ?
Solution:
The kinetic energy is given as:
Kinetic energy = [tex]\frac{1}{2}[/tex] m v²
Now insert the parameters and solve;
m is the mass
v is the velocity
Kinetic energy = [tex]\frac{1}{2}[/tex] x 1200 x 10² = 60000J
oi oi oi oi oi help pls
Answer:
F
Explanation:
nonmetal doesn't conduct, is shiny and silver and is solid. Hope this helps :)
How many moles are in 3.45 g of Ba(CIO3)2 ?
0.0113 mol Ba(ClO₃)₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structures
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
3.45 g Ba(ClO₃)₂
Step 2: Identify Conversions
Molar Mass of Ba - 137.33 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Ba(ClO₃)₂ - 137.33 + 2(35.45) + 6(16.00) = 304.33 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 3.45 \ g \ Ba(ClO_3)_2(\frac{1 \ mol \ Ba(ClO_3)_2}{304.33 \ g \ Ba(ClO_3)_2})[/tex]Multiply/Divide: [tex]\displaystyle 0.011336 \ mol \ Ba(ClO_3)_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.011336 mol Ba(ClO₃)₂ ≈ 0.0113 mol Ba(ClO₃)₂
What does the term periodic mean?
Answer:
relating to the periodic table of the elements or the pattern of chemical properties that underlies it.
Explanation:
Answer:
Periodic refers to properties that repeat at certain intervals. Explanation: The elements on the periodic table repeat at intervals called periods.
Explanation:
I need help. Please be honest
Mass of Oxygen : 8.0 g
Further explanationGiven
1.51 x 10²³ molecules of Oxygen(O₂)
Required
Mass of Oxygen
Solution
1 mol = 6.02 x 10²³ particles(molecules, atoms, ions)
Can be formulated :
N = n x No
n = moles
No = Avogadro's number
Find moles of Oxygen :
n = N/No
n = 1.51 x 10²³ / 6.02 x 10²³
n = 0.251
Mass of Oxygen :
mass = mol x MW O₂
mass = 0.251 x 32 g/mol
mass = 8.032≈ 8.0 g
PLZ ANSWER REALLY FAST NO JOKES
A piece of nickel at 25 °C is dropped into a glass of water at 25 °C. Which statement is correct?
Heat will flow from the nickel to the water in the glass.
Heat will flow from the water in the glass to the nickel.
There will be no transfer of heat from the nickel to the water in the glass.
The final temperature of water and nickel will be 0 °C.
Answer:
The temperature of the water in both beakers will decrease
Explanation:
Answer:
I believe it's C. "There will be no transfer of heat from the nickel to the water in the glass."
Explanation:
there won't be any transfer of heat from the nickel to the water in the glass because both the nickel and the glass of water are at the same temperature.