Answer:
''The relationship between air pressure, air density, or altitude? As altitude increases, pressure increases. As altitude increases, air density increases. Air pressure and density are lowest at sea level.''
Explanation:
It took 25 seconds for a horse to complete a 400 meter race. What was the speed of the horse?
Answer:
v = 16 m/s
Explanation:
Given that,
Distance, d = 400 m
Time taken, t = 25 s
We need to find the speed of the horse. Speed is equal to distance covered divided by time taken. So,
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{400\ m}{25\ s}\\\\v=16\ m/s[/tex]
So, the speed of the horse is 16 m/s.
Which group in the periodic table contains the lightest ferromagnetic element?
Question 12 options:
A)
Group 9
B)
Group 8
C)
Group 10
D)
Group 7
The answer is B) Group 8 .
1. Which of these is a chemical property? *
a) oxygen is a gas at 25 degree Celsius. b) helium is very nonreactive. c) ice melt at 0 degree Celsius. d) sodium is a soft, shiny metal.
he chemical formula for lithium hydride is LiH A chemist determined by measurements that 0.0800 moles of lithium hydride participate in a chemical reaction. Calculate the mass of lithium hydride that participates. Be sure your answer has the correct number of significant digits.
CAN SOMEONE HELP PLEASE
The mass of lithium hydride that participates in the chemical reaction is 6.35 grams.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles by its molar mass as follows:
mass (g) = no of moles (mol) × molar mass (g/mol)
According to this question, the chemical formula for lithium hydride is LiH. A chemist determined by measurements that 0.0800 moles of lithium hydride participate in a chemical reaction.
Molar mass of LiH = 6.941 + 1 = 7.94g/mol
mass = 0.8mol × 7.94g/mol = 6.35grams
Therefore, 6.35g is the mass of the lithium hydride.
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Plants and animals depend on glucose (C6H12O6) as an energy source. Calculate the number of moles of each element in 1.25 mol C6H12O6.
Answer:
15 mol.
Explanation:
trust
Mole measure the number of elementary entities of a given substance that are present in a given sample. Thereofre, the number of moles of each element in 1.25 mol C6H12O6. 1.25 mol of carbon, 1.25 mol of hydrogen and 1.25 mol of oxygen.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
1.25 mol C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_6[/tex], contains 1.25 mol of carbon, 1.25 mol of hydrogen and 1.25 mol of oxygen. So, total sum of mol of each element is equal to 4.5 mol.
Therefore, the number of moles of each element in 1.25 mol C6H12O6. 1.25 mol of carbon, 1.25 mol of hydrogen and 1.25 mol of oxygen.
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according to periodic trends which element would have more valence electrons than sulfur
Answer:
Chlorine,Argon
Explanation:
All the elements of group 18 and group 17
The periodic table depicts the various elements arranged based on the increasing order of their atomic numbers. Argon and chlorine will have more valence electrons than sulfur.
What is the periodic trend of valence electrons?A valence electron is an electron of an atom present in the outermost shell that participates in bond formation. The valence electrons are the same in elements placed in the same group or family.
The number of valence electrons increases in a horizontal row called the period of the periodic table. As when one moves from left to right in a period the valence electron increases.
The number of valence electrons in a sulfur atom is 6, whereas in chlorine is 7 and in argon is 8. As chlorine and argon are placed after sulfur in a period will have more valence electrons.
Therefore, argon and chlorine have more valence electron than sulfur.
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Percentage of isotopes in 35/17 Cl and 37/17 Cl
Explanation:
Average atomic mass of Chlorine = 35.45 amu
The percentage of isotopes is the percentage abundance.
This is given by;
Average atomic mass = (Mass of isotope * Percentage abundance of 35/17 Cl) + (Mass of isotope * Percentage abundance 37/17 Cl)
Let percentage abundance of 35/17 Cl = x
Then percentage abundance of 37/17 Cl = 1 - x
Putting the values in the equation;
35.45 = (35 * x) + (37 * (1-x))
35.45 = 35x + 37 - 37x
35.45 - 37 = 35x - 37x
- 1.55 = -2x
x = 1.55 / 2 = 0.775
Percentage abundance of 35/17 Cl = 0.775 * 100 = 77.5%
Percentage abundance of 37/17 Cl = (1 - 0.775) * 100 = 22.5%
How much of the total mass of the solar system is contained in the Sun?
27.3%
55.7%
75.2%
99.8%
Answer:
99.8%
Explanation:
Answer: 99.8%
Explanation:
Sun Facts. The Sun is the largest object within our solar system, comprising 99.8% of the system's mass. The Sun is located at the center of our solar system, and Earth orbits 93 million miles away from it. Also the sun is the hottest star in the ENTIRE galaxy :)
CaC12 * 3H20 is correctly named
a.
Calcium chloride trihydrate
b.
Calcium Dichloride tri water
Calcium chloride trihydrogen dioxide
d.
none of the above
Answer:
calcium chloride deihydrate
how do I balance these
The diagram below represents the inputs and outputs of cellular respiration. The arrows entering the cell are inputs. The arrows exiting the cell are outputs. Complete the diagram by adding the missing input and output.
Answer:
Oxygen and Carbon Dioxide
Explanation:
Study Island
Describe the structure of the beryllium atom. In your answer make reference to the number of sub-atomic particles and where they are found in the atom.Immersive Reader
(5 Points)
Answer:
The nucleus consists of 4 protons (red) and 5 neutrons (orange). Four electrons (white) occupy available electron shells (rings). The stability of an element's outer (valence) electrons determines its chemical and physical properties. Subatomic particles are particles that are smaller than the atom. Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P."
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A beryllium atom has atomic number 4 where its nucleus has 4 protons and 5 neutrons and 4 electrons revolving around the nucleus in in the shells.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Which of the following summaries expresses the main points of the passage best?
I believe gravity is the most important aspect of our universe. Without it we would all be floating off
into the universe. There wouldn't be any orbits; instead, all planetary bodies would simply float
around, running into each other when they crossed paths and just wandering forever.
There is a gravitational force between all objects in the universe. Gravitational force is what keeps all
components of our solar system in orbit around the Sun, as well as moons in orbit around planets. The
force of gravity affects Earth's tides and holds us on Earth's surface. The force of gravity between
objects depends on their masses and the distance between them.
Gravity is hard to understand and scientists have little to no understanding of how it works. We know
that gravity is out there, but the specifics are often lost on us. Plants, animals, and humans are all able
to grow tall due to the pull on Earth from the Sun. Without the Sun we would all just stretch out along
Earth's surface
None of the above
Answer:B
Explanation:
The summary which expresses the main points of the Gravitational force best is the second one.
What is gravitational force?Gravitational force is a attraction force which is present between two objects and represented as:
F = gm₁m₂ / r², where
g = gravitational constant
m₁ = mass of one object
m₂ = mass of another object
r = distance between two objects
Because of gravity all objects will have a accurate position and particular order.
Hence second paragraph expresses best.
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If we add 20g of salt to 150g of water, what is the concentration by mass of the solution?
Answer:
11.76% by weight in salt
Explanation:
concentration = mass of solute / mass of solute + mass of solvent
mass of solute = 20 grams
mass of solvent = 150 grams
mass of solute + mass of solvent = 20g + 150g = 170g
concentration (weight %) = (20g / 170g)100% = 11.76% by weight in salt.
In the lewis structure for a molecule of ammonia (NH3), how many lone pairs of electrons does nitrogen have? PLEASE HELP
d) 0.
5 out of 8 would be paired already because it has 5 electrons, then the other 3 would be filled by the 3 hydrogens.
Find the amount of heat (Q) needed to raise the temperature of 5.00 g of a substance from 20.0 C to 30.0C if
the specific heat of the substance is 2.01 J/gC.
Answer:
100.5 J
Explanation:
im completely finish why is it at 99.5 instead of 100??
Answer:
because u need one more assianment before it becomes 100
Explanation:
After the HCl and NaOH react, Fernando measures the
mass again. Using the mass before the reaction in the
diagram, what is the mass after the reaction?
Remember, It is in a closed system.
A. 5.00 grams
OB. 10.00 grams
O C. 15.00 grams
OD. 20.00 grams
Answer:c
Explanation:
As the combined mass of the HCl and NaOH is 15 grams before the reaction. Therefore the mass after the reaction will be 15 grams according to the law of conservation of mass. Therefore, option (C) is correct.
What is law of conservation of matter?Matter can be transformed form via physical changes and chemical changes from one form to another form, during any of these changes, the total mass is conserved. The same quantity of matter exists before and after the chemical or physical as none of the matter is created or destroyed.
The balanced equation between the reaction of HCl and NaOH:
[tex]HCl +NaOH \longrightarrow H_2O +NaCl[/tex]
According to the law of conservation of mass, the mass of HCl and NaOH will be equal to the mass of the products water and NaCl.
As mentioned in the question the combined mass of HCl and NaOH measured before the reaction is 15 grams. Therefore, the mass of the products in the closed container will be equal to 15 grams as well.
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Your question was incomplete, most probably the complete question was,
Fernando places 15 ml of HCl and 50 ml of NaOH in 100 ml of a beaker. He places them on a scale together and measures the combined mass of 15 grams.
After the HCl and NaOH react, Fernando measures the mass again. Using the mass before the reaction, what is the mass after the reaction? Remember, It is in a closed system.
A. 5.00 grams
B. 10.00 grams
C. 15.00 grams
D. 20.00 grams
can someone please help me and don’t answer if you don’t know the answer please
thank you :)
Can someone help me thx
Answer:
salt i know the answer and even sugar is
Explain:Will the bag of dog food be easier to lift?
Answer: Registered. My 65 pound dog and my 20 pound dog share an 18 pound bag of 4Health and it lasts them 3 and 1/2 weeks.
Explanation:
Answer:
Well it depends how much the bag weighs in LB and your strength.
Explanation:
Given the following equation: 3Cl2 (g) + 8NH3 (g) → N2 (g) +
6NH4Cl (s)
How many moles of NH3 are required to produce 12 moles of NH4CI?
Answer:
16 mol
Explanation:
3Cl2 (g) + 8NH3 (g) → N2 (g) + 6NH4Cl (s)
from reaction 8 mol 6 mol
given x mol 12 mol
8 : x = 6 :12
6x = 12*8
x = 12*8/6 =16 mol
please help need 18-20 answer
Answer:
800 ml
marbel
flow
Explanation:
Why does oxygen have a higher electronegativity compared to chlorine?
Answer:
The electronegativity of fluorine compare to the electronegativity of oxygen and chlorine as below
Explanation:
Fluorine has the highest electronegativity than oxygen, and chlorine.
Explanation
Generally the electronegativity increase across the period ( from the left to the right) and decreases down the group.
Both oxygen and fluorine are in period 2 in periodic table. since fluorine is on fur right side as compared to oxygen , fluorine has higher electronegativity than oxygen.
On the other side Fluorine and chlorine are in the same group in periodic table. fluorine is at the top of the group while chlorine is at the bottom therefore fluorine has higher electronegativity than chlorine.
Hydrochloric acid (HCI) breaks down into hydrogen gas and chlorine gas according to the reaction:
2 HCI — Cl2 + H2
If 42 grams of HCl reacts, what is the theoretical yield of hydrogen gas produced?
A) 2.32 g
B) 737 g
C) 0.57 g
D) 1.16 g
Answer:
(D)=1.16g
Explanation:
Answer:
D) 1.16 g
I'm not sure about answer ..
N203
Name the mixed compound (chemical and common names)
Answer:
N203 is a chemical compound some chemical names for N203 are Nitrogen trioxide. It is aka Dinitrogen trioxide, or nitrogen sesquioxide.
Explanation:
I searched it up
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Help chemistry work!!!!!!!!
Answer:
SEE EXPLANATION
Explanation:
A)
1) The balanced chemical reaction is;
Fe2O3 + 3H2O------> 2Fe(OH)3
2) C12H22O11------> 12 C + 11H2O
B) 1 is a combination reaction
2 is a decomposition reaction
C) The molar mass of NH3 is 14 + 3(1) = 17 g/mol
Percentage composition of N = 14/17 * 100/1 = 82. 4 %
D) 1 mole of O2 contains 6.02 * 10^23 particles
E) For (NH4)3 PO4
We have 3(14 + 4(1)) + 31 + 4(16) = 149 g/mol
F) 1 mole of CaCO3 contains 100g of CaCO3
1.25 moles of CaCO3 contains 1.25 * 100/1 = 125 g of CaCO3
In 1976, what happened at Big Thompson Canyon in Colorado? *
Answer:
Flash Flood
Explanation:
On July 31, 1976, during the celebration of Colorado's centennial, the Big Thompson Canyon was the site of a devastating flash flood that swept down the steep and narrow canyon, claiming the lives of 143 people, 5 of whom were never found.
what happens when a copper vessel is exposed to moist air for long? please answer fast
how many moles are in 100g of KMn04
