Answer:
Oceanic lithosphere forms at midocean ridges, where hot magma upwells, and then cools to form plates as the material moves away from the spreading center. As the plate cools, heat flow decreases and the seafloor deepens
Explanation:
Brainliest plzzzzzzz
what is the relationship between the dipole moment and bond moment? explain it with examples ,how it possible for a molecule to hae bond moment and yet be nonpolar?
Answer :
Dipole moments occur when there is a separation of charge. Dipole moments occur due to atoms electronegativity, where one atom has the ability to attract electrons towards it giving it a negative charge and the one deficient in electrons acquire a positive charge called as the bond moment.
But if the bond moments are equal and opposite in direction , they cancel each other and thus there is no net dipole moment in the molecule.
For example: In carbon dioxide , both the -C=O bonds are polar but as the molecule is linear and the the magnetic moments are equal and oppposite, they cancel each other and the molecule is non polar.
Based on the organization and colors in the periodic table, which
two elements do you think are most similar in terms of their properties:
magnesium (Mg), barium (Ba), and gold (Au)? Explain.
Answer:
Magnesium (Mg) and Barium (Ba) are most similar in terms of properties.
Explanation:
The periodic table of elements is organized with elements classified by atomic number. Each column in the table represents elements grouped together by protons in the nucleus and as a result of that also charge. The first column of elements have a +1 charge, while the second column have a +2 charge.
Electronegativity, mass and weight can also be determined by the location of elements in the table, with elements becoming more electronegative from left (least amount) to right (most) and more heavy from top to bottom. Because Magnesium and Barium are in the same column, while gold is in a different column (and assigned a different color) it indicates the element gold is not like the other two and has different properties.
Based on the organization of elements in the periodic table, the two elements that will be similar are magnesium (Mg), barium (Ba).
The periodic table is arranged in rows called periods and columns called groups.
Elements in the same group of the periodic table are chemically similar because they have the same number of electrons in their outermost shell and consequently undergo the same kind of chemical reactions.
Having said that, Barium and magnesium both belong to group 2 of the periodic table hence they have the similar properties because they are all members of the same group.
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How many atomsl# of
particles of Hydrogen are
there in 2 moles of Hydrogen?
(hint this is not a small
number)
Answer:
1.204×10^24 atoms
Explanation:
1 mole of element contains 6.02×10^23 atoms so 2 moles of hydrogen contains 2×6.02×10^23 = 1.204×10^24 atoms
What is tree rings tell us?
Answer:each of a number of concentric rings in the cross section of a tree trunk, representing a single year's growth.
Explanation:it tell whats the age of the tree.
Given 2AL + 6HCL → 2ALCL3 + 3H2, how many grams of aluminum do I need to produce 11 L of hydrogen gas at STP?
Mass of Aluminum= 8.829 g
Further explanationGiven
Reaction
2Al + 6HCl → 2AlCl₃ + 3H₂
Required
mass of Aluminum
Solution
At STP, 1 mol gas = 22.4 L
For 11 L of Hydrogen :
= 11 : 22.4
= 0.491
From equation, mol ratio Al : H₂ = 2 : 3, so mol Al :
= 2/3 x mol H₂
= 2/3 x 0.491
= 0.327
Mass Aluminum(Ar=27 g/mol) :
= 0.327 mol x 27 g/mol
= 8.829 g
When sodium is dissolved in water, why is it that the water molecules orient themselves such that their oxygen atoms are facing the sodium? Be specific.
Answer: water molecules are polar and Os are slightly negative. Na loses its electron to the nearest H and so is positive. The overall reaction is that the single electron of Na attaches to a H, breaking the bond with O. This leaves Na+ and the OH- ions in solution, while the H atoms form H2 and are released as gas.
Explanation:
According to the forces of attraction in molecules where there is attraction between opposite charges the water molecules orient themselves such that their oxygen atoms are facing the sodium.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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what is the change in the velocity of the biker below as he travels from point b to point c ? ..... What is his acceleration from point b to point c ?
The change in the velocity = 4 m/s
Acceleration = 4 m/s²
Further explanationGiven
vo = initial velocity = 4 m/s
vf = final velocity = 8 m/s
t = 1 s
Required
The change in the velocity
Acceleration
Solution
the change in velocity =
[tex]\tt vf-vo=8-4=4~m/s[/tex]
Acceleration = ratio of a change in velocity and the time
[tex]\tt a=\dfrac{\Delta v}{t}= \dfrac{vf-vo}{t}[/tex]
Input the value :
[tex]\tt a=\dfrac{4~m/s}{1~s}=4~m/s^2[/tex]
Explain how the valence electrons are related to the element's period.
Answer:
The number of valence electrons in an atom is reflected by its position in the periodic table of the elements (see the periodic table in the Figure below). Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next
On which property of the particles in a material does the speed of sound depend?
Answer:
The velocity of a sound wave is affected by two properties of matter: the elastic properties and density.
Explanation:
The speed of sound is faster in solid materials and slower in liquids or gases. The velocity of a sound wave is affected by two properties of matter: the elastic properties and density.
The speed of sound also depends on the temperature of the medium. The hotter the medium is, the faster its particles move and therefore the quicker the sound will travel through the medium. When we heat a substance, the particles in that substance have more kinetic energy and vibrate or move faster.
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Determine the mass of oxygen that is needed to react with 33 grams of phosphorus.
4P + 5 02 → 2 P205
A
27.3 grams O2
B
1.33 grams 02
С
213 grams 02
oo
42.6 grams 02
Answer:
D = Mass = 42.6 g
Explanation:
Given data:
Mass of phosphorus react = 33 g
Mass of oxygen needed = ?
Solution:
Chemical equation:
4P + 5O₂ → 2P₂O₅
Number of moles of phosphorus:
Number of moles = mass/molar mass
Number of moles = 33 g/ 30.97 g/mol
Number of moles = 1.065 mol
now we will compare the moles of phosphorus and oxygen.
P : O₂
4 : 5
1.065 : 5/4×1.065 = 1.33mol
Mass of oxygen needed:
Mass = number of moles × molar mass
Mass = 1.33 mol × 32 g/mol
Mass = 42.6 g
Thus, 43.6 g of oxygen needed to react with 33 g of phosphorus.
Aglae are aquatic organisms that use water, carbon dioxide, and sunlight to provide their own Energy Systems need to consume energy by eating algae and other organisms which of the following statements describe fish and algae? A- fish are autotrophs and aglae are heterotrophs B- fish and aglae are both heterotrophs C- fish and algae are both autotrophs D- fish are heterotrophs and aglae are autotrophs
Answer:
D
Explanation:
Algae produces their own energy through photosynthesis, making them autotrophs. Fish have to consume energy by eating other organisms making them heterotrophs.
6. How many grams are there in...
a. 69 L of O2
Answer:
one mole or 31.9
Explanation:
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What element has 70 electrons and 102 neutrons?
Answer:
The answer is Ytterbium but it is one of it isoptoped so techniacally it would be Ytterbium 102.
how would you describe a solid substance appearance before melting
1. Give one word for each of the following descriptions
(a) The group of hydrocarbons to which 2-methyl-propene belongs
b) The name of the functional group that gives alcohols
their properties
Alkyl halide, Isobutylene
Explanation:
PLS HELP ASAP I NEED NUMBER 8
Explanation:
determine the genotypes of the parent organisms.
write down your "cross" (mating)
draw a p-square.
4. " ...
determine the possible genotypes of the offspring by filling in the p-square.
summarize results (genotypes & phenotypes of offspring)
what is this balanced?
Al2O3---> Al+O2
The balanced equation :
2Al₂O₃⇒ 4Al+3O₂
Further explanationGiven
Reaction
Al₂O₃⇒ Al+O₂
Required
Balanced equation
Solution
A chemical reaction is said to be balanced if the number of elements involved in the reaction is the same (either the reactants or the products)
The reaction above is said to be unbalanced because the number of elements Al and O in the reactants and products is not the same.
The balancing step
1. Give a coefficient
Al₂O₃⇒ aAl+bO₂
2. Make an equation
Al, left = 2, right = a⇒a=2
O, left = 3, right = 2b⇒2b=3⇒b=3/2
The equation becomes :
Al₂O₃⇒ 2Al+3/2O₂ x2
2Al₂O₃⇒ 4Al+3O₂
Consider the combustion of propane: A balloon is being inflated to its full extent by heating the air inside it. In the final stages of this process, the volume of the balloon changes from L to L by the addition of J energy as heat. Assume that all the heat comes from the combustion of propane. What mass of propane must be burned to furnish this amount of energy assuming the heat transfer process is 50.% efficient?
Answer:
5162.539 g
Explanation:
Let assume that the volume changes from [tex]4.00 \times 10^6 \ L[/tex] to [tex]4.50 \times 10^6 \ L[/tex].
And if the addition of energy as heat is [tex]1.3 \times 10^8 \ J[/tex]
Then; we can say that the total heat that is taken by the ballon = [tex]1.3 \times 10^8 \ J[/tex]
[tex]= 1.3 \times 10^5 \ kJ[/tex]
The total heat supplied = total heat coming from the combustion of propane
∴
[tex]= \dfrac{100}{50} \times 1.3 \times 10^5 \ kJ[/tex]
[tex]= 2.6 \times 10^5 \ kJ[/tex]
[tex]C_3 H_{8(g)} + 5O_{2(g)} \to #CO_{2(g)} + 4H_2O_{(l)} \ \ \Delta H = -2221 \ kJ[/tex]
If 2221 kJ is produced as a result of the combustion of 44.1 g [tex]C_3H_{8(g)}[/tex]
Then;
[tex]2.6 \times 10^5 kJ[/tex] will produce [tex]= \Big( \dfrac{44.1 \times 2.6 \times 10^5}{2221} \Big ) \ g[/tex]
= 5162.539 g
Thus, the mass of the propane that must be burned = 5162.539 g
At a certain temperature the vapor pressure of pure acetyl bromide is measured to be . Suppose a solution is prepared by mixing of acetyl bromide and of heptane . Calculate the partial pressure of acetyl bromide vapor above this solution. Round your answer to significant digits. Note for advanced students: you may assume the solution is ideal.
Answer:
0.17 atm
Explanation:
Raoult´s law can be applied in solving this problem:
Pa= XaPºa (a= acetyl bromide in this case)
where Pa = partial pressure acetyl bromide
Xa = mole fraction of acetyl bromide in the solution
Pºa= vapor pressure of pure acetyl bromide = 0.75 atm(given)
Hence we can find the mole fraction of the acetone in the mixture:
Let the number of moles of acetone be a and the number of moles of thiophene be t
Xa = mol of a / ( mol of a + mol of t )
We now have;
Molar Weight of a= 112.95 g/mol
number of moles of a = 51.8 g/mol x 1 mol/122.95 g = 0.42 moles
Molar Weight of t = 84.14 g/mol
number of moles of t = 123 g x 1mol/84.14 g= 1.46 mol
mole fraction of a; Xa = 0.42/ (0.42 + 1.46) = 0.22
Pa = 0.22 x 0.75 atm = 0.17 atm
What is Displacementsubject Physics,
Explanation:
Displacement is the distance travelled in a specific direction. Unlike distance, displacement is a vector quantity with both magnitude and directional attribute.
When we specific displacement values, we must indicate the direction of motion to complete its description.
For example, 50m is a distance value. It has a magnitude but no direction.
When we say 50m due south, this is a displacement because both magnitude and direction are accurately specified and defined.
How many liters of carbon dioxide will be produced when 89.5 L of ethane are burned? (One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.)
Answer:
179 L of CO2
Explanation:
Given the equation of the reaction;
C2H6(g) + 7/2 O2(g) -------> 2CO2(g) + 3H2O(g)
Now 1 mole of ethane yields 2 moles of CO2 from the balanced reaction equation
1 mole of a gas occupies 22.4 L volume so,
22.4 L of ethane yields 44.8 L of CO2
89.5 L of ethane yields 89.5 * 44.8/22.4 = 179 L of CO2
Arteries do not contain muscle of any type.
True or False?
False.
Arteries are said to be more muscular.
That means Arteries ARE* MUSCLES
A moving van crew picks up the following items: a sofa that weighs 158 pounds, a chair that weighs 65.7 pounds, a piano that weighs 3.8*10^2 pounds, and several boxes with a combined weight of 147.65 pounds. What total weight in pounds should be listed on the billing sheet? Express your answer in scientific notation.
The total weight in pounds should be listed on the billing sheet is [tex]7.5135\times 10^2 pounds[/tex].
Explanation:
Scientific notation is a way of representing a very small or a very large number or quantity in which the number is written in decimal form along with the number '10' which has some appropriate power.For example :[tex]3.45\times 10^{16}[/tex] Liters of water
[tex]4.89\times 10^{-9}[/tex]meters
Given:
Weight of sofa = 158 pounds
Weight of chair = 65.7 pounds
Weight of piano =[tex]3.8\times 10^2 pounds[/tex]
Weight of several boxes = 147.65 pounds
To find:
Total weight in pounds
Solution:
Weight of sofa = 158 pounds
Weight of chair = 65.7 pounds
Weight of piano =[tex]3.8\times 10^2 pounds=380 pounds[/tex]
Weight of several boxes = 147.65 pounds
Total weight of all the items in pounds:
[tex]=158 pounds + 65.7 pounds +380 pounds+147.65 pounds\\=751.35 pounds\\=\frac{751.35\times 10^2}{10^2}=7.5135\times 10^2 pounds[/tex]
The total weight in pounds should be listed on the billing sheet is [tex]7.5135\times 10^2 pounds[/tex].
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A sample of 254.2 grams of copper completely reacted with oxygen to form 286.2 grams of copper oxide product how many grams of oxygen reacted
During a chemical reaction nb of atoms and mass is always conserved , so mass of Reactants is equal mass of Products.
A student experimentally determines the density of a metal cube. The edge length of the cube is measured using calipers. The cube's true density is 12.30 g/cm. Use the student's collected data below and calculate the percent error for the measurement.
Student's Collected Data:
Cube's Mass 551786
Edge Length 1.72 cm
Percent error= _______%
Answer:
10.9%.
Explanation:
The first thing to do in order to solve this question is to Determine the value for the volume of the the cube. This can be done by taking the cube root of the length of the cube;
The volume of the cube = (length of the cube)^3 = length × length × length = 1.72 × 1.72 × 1.72 =( 1.72)^3 = 5.09cm^3.
The next thing you do is to Determine the exponential density, the can be done by using the formula below;
The exponential density = mass/ volume = 55. 786/ 5.09 = 10.96 g/cm^3.
Therefore, the percent error = (true density of the cube - exponential density of the cube)÷ true density of the cube × 100.
Hence, the percent error = 12.30 - 10.96/12.30 × 100 = 10.9%.
If you have 312 grams of calcium chloride, how many atoms would you have?
1.69 × 10²⁴ atoms CaCl₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableWriting CompoundsAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Use Dimensional AnalysisExplanation:Step 1: Define
312 g CaCl₂ (calcium chloride)
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Ca - 40.08 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of CaCl₂ - 40.08 + 2(35.45) = 110.98 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 312 \ g \ CaCl_2(\frac{1 \ mol \ CaCl_2}{110.98 \ g \ CaCl_2})(\frac{6.022 \cdot 10^{23} \ atoms \ CaCl_2}{1 \ mol \ CaCl_2})[/tex]Divide/Multiply: [tex]\displaystyle 1.69298 \cdot 10^{24} \ atoms \ CaCl_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.69298 × 10²⁴ atoms CaCl₂ ≈ 1.69 × 10²⁴ atoms CaCl₂
Iron metal reacts with elemental oxygen to form rust according to the unbalanced reaction, Fe(s) + O2(g) → Fe2O3(s),. What is the coefficient of the oxygen, O2(g), in the balanced reaction?
a
1
b
2
c
3
d
4
Answer:
c. 3
Explanation:
The unbalanced reaction expression is given as:
Fe + O₂ → Fe₂O₃
To balance the expression gives the coefficient of oxygen.
Assign the coefficients a,b, c and use a mathematical approach to solve this problem:
aFe + bO₂ → cFe₂O₃
Conserving Fe: a = 2c
O: 2b = 3c
Now let c = 1, a = 2, b = [tex]\frac{3}{2}[/tex]
Multiply through by 2,
a = 4, b = 3 and c = 2
4Fe + 3O₂ → 2Fe₂O₃
The coefficient of O₂ is 3
Convert 55 miles/ hour to feet/ second
Answer:
80.685 feet/second
Explanation:
which of the following is the best characterization of the nature of light?
Answer: Light is a transverse, electromagnetic wave that can be seen by the typical human. The wave nature of light was first illustrated through experiments on diffraction and interference
Explanation:
Answer:
Light energy
Explanation:
What type of reaction has only one reactant
Answer:
composition reaction has only one reactant
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