the carbon cycle is the process in which carbon travels from the atmosphere into organisms and the earth and then back into the atmosphere
how many Atoms of chlorine Cl are there in 3.45 mol Cl?
Answer:
2.078x10^24
Explanation:
No. of atoms of chlorine = 3.45 x 6.022x 10 ^23 x 1
= 2.078x10^24
( to find no. of atoms of, heres the formula i was taught No. of atoms = no. of moles x Avogadros constant x no. of atoms in the formula of compound)
Which substance should a student apply to the skin if he or she gets splashed with an acid?
A calcium atom differs from a calcium ion in that the atom has a greater
A)
number of electrons
B)
number of protons
C)
atomic number
D)
mass number
Answer:
A) number of electrons
Explanation:
A calcium atom has 20 electrons while a calcium ion has 18 electrons since it loses 2 electrons to form a stable octet structure. The formula of a calcium ion is Ca2+.
The number of protons does not change, neither do the number of neutrons. Atomic number is the proton number which is equals to the number of protons, hence B and C is wrong. Mass number is the number of protons and neutrons. Hence it doesnt change too and D is wrong.
Only the number of electrons change when an atom forms an ion.
Name some uses of Chlorine and bromine compounds
Answer:
kii
Explanation:
Which equilibrium describes a reversible reaction a short time after starting the reaction with reactants only?
Answer:
Should be A
Explanation:
A typical cell phone uses wavelength of 0.36meters. How much energy does this wave have?
Answer:
55×10^-26 J
Explanation:
We can calculate the energy of the wave from
E= hc/λ
Where
h= Planks constant = 6.6×10^-34 Is
c= speed of light = 3×10^8 ms-1
λ= wavelength of the wave = 0.36 metres
Recall that cell phone use radio waves which belong to the electromagnetic spectrum hence it must possess the speed of light.
E= 6.6×10^-34 × 3×10^8/ 0.36
E= 55×10^-26 J
Hence the energy possessed by 0.36 meters wavelength radio waves is 55×10^-26 J
Which situation describes why a rock sinks in water?
A. Air pressure is greater than the buoyant force.
B. The force of gravity is greater than the buoyant force.
c. The buoyant force is greater than the force of gravity.
D. The rock is less dense than water.
Answer:
b
Explanation:
How much would this compound weight
Answer:98g/mol
Explanation:
What is the answer ?
Answer: c
Explanation: an xray wave does have a higher frequency than an infrared wave.
Answer:
Explanation:c
how many moles of solute are present in 50.0 ml of 0.20 m kno3
Answer: Volume = 50.0 mL in liters : 50.0 / 1000 = 0.05 L
n = M x V
n = 0.20 x 0.05
n = 0.01 moles of solute
Explanation:
The number of moles of solute are present in 50.0 mL of 0.20 M of KNO₃ solution is 0.01 moles.
How do we calculate moles?Moles will be calculated by using the molarity formula because molarity is define as the no. of moles of solute present in per liter of the solution as:
M = n/V, where
M = molarity of KNO₃ = 0.2 M
V = volume of solution = 50mL = 0.05L
Moles will be calculated as:
n = (0.2)(0.05) = 0.01 moles
Hence required moles are 0.01 moles.
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The only thing that makes one kind of light different from another is it’s ____?
A) frequency
B) color
C) wavelength
D) temperature
A pelican is born with a larger bill than other pelicans of the same species. When this pelican
breeds, some of its offspring also have larger bills. What is the most likely explanation for the
larger bills in the pelican and its offspring?
Inheritance of an quoted trait
A mutation
Natural selection
A change in diet
Answer:
natural selection
Explanation:
it is a biological selection of genes, whether dominant or negative.
How many joules are produced when 45 gram of copper is placed into water that releases them temperature from 12c to 71c (c)=0.75j/g*c
Answer:
Heat energy (Q) = 1.9925 KJ = 2 KJ (Approx)
Explanation:
Given:
Mass of copper (M) = 45 gram
Change in temperature (ΔT) = 71°C - 12°C = 59°C
Specific heat (c) =0.75 j /g*c
Find:
Heat energy (Q) = ?
Computation:
Heat energy (Q) = Mass(M) × Change in temperature (ΔT) × Specific heat (c)
Heat energy (Q) = 45 gram × 59°C × 0.75 j /g*c
Heat energy (Q) = 1991.25 J
Heat energy (Q) = 1.9925 KJ = 2 KJ (Approx)
What kind of energy transformations occur when you hit a coconut with a hammer
sound energy, kinetic energy,
i cant think of any more but hope this helps
Answer:
Mechanical to kinetic to sound to heat
Explanation:
Remember that all types of energy transformation end in heat
Why is soap mixed with water?
O A. The soap turns the water molecules into a nonpolar solvent.
B. It covalently bonds to the water so it can be washed away.
O C. Its polar end mixes with the water so it can be washed away.
D. The soap becomes chemically active when mixed with water.
Answer:
Explanation:
Soap breaks up the oil into smaller drops, which can mix with the water. It works because soap is made up of molecules with two very different ends. One end of soap molecules love water - they are hydrophilic. The other end of soap molecues hate water - they are hydrophobic.
Answer:
C. Its polar end mixes with the water so it can be washed away.
Explanation:
Just took test
sonar measures underwater distances by using?
Answer:
By using the speed of sound in water
Explanation:
(Which is about 1500 m/s in sea depending on the sea water density )
Fiona is examining a material. She notices that the material has a dull appearance and feels very brittle.
Fiona is most likely examining a _______
(I'll give brainliest)
"Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides." - Wikipedia
what happens to the density of a box full of leaves if you crush up all the leaves and place them in another box
A the density increases
B the density stays the same
C the density decreases
D the density first decreases, then increases
Answer:
B the density stays the same
What is the mole fraction of Ba(OH)2 in an aqueous solution that contains 22.8% Ba(OH)2 by mass?
Answer:
0.03
Explanation:
22.8 g Ba(OH)2 (1 mol Ba (OH)2/ 171.34 g) = 0.133 mol Ba (OH)2
77.2 g H2O (1 mol H2O/18 g) = 4.29 mol H2O
X= molar fraction= mol Ba(OH)2/ mol total
X= 0.133/ (0.133+4.29) = 0.03
0.03 is the mole fraction of [tex]Ba(OH)_2[/tex] in an aqueous solution that contains 22.8% [tex]Ba(OH)_2[/tex] by mass.
What is a mole fraction?The ratio of the number of moles of one component of a solution or other mixture to the total number of moles representing all of the components.
Moles of [tex]Ba(OH)_2[/tex]
Moles = [tex]\frac{mass}{molar \;mass}[/tex]
Moles = [tex]\frac{22.8 g Ba(OH)_2}{171.34 g}[/tex]
= 0.133 mol [tex]Ba (OH)_2[/tex]
Moles of [tex]H_2O[/tex]
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]Moles = \frac{77.2 g H_2O}{18 g}[/tex]
= 4.29 mol [tex]H_2O[/tex]
The mole fraction of [tex]Ba(OH)_2[/tex]
[tex]\frac{mol Ba(OH)_2}{total \;mol}[/tex]
= 0.03
0.03 is the mole fraction of [tex]Ba(OH)_2[/tex] in an aqueous solution that contains 22.8% [tex]Ba(OH)_2[/tex] by mass.
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HELPPP ASAPPPP PLEASEEEEEEEEEEEEEEEEEE
Determine the mass of hydrogen in a 2.5 sample of ammonia
show work using dimensional analysis
Answer:
[tex]\large \boxed{\text{0.44 g}}[/tex]
Explanation:
1. Calculate the molar mass of ammonia
1 N = 1 × 14.01 g = 14.01 g
3 H = 3 × 1.008 g = 3.024
TOTAL = 17.03 g
2. Calculate the mass of hydrogen
So, there are 3.024 g of H in17.03 g of NH₃.
The conversion factor is either
[tex]\dfrac{\text{3.024 g H}}{\text{17.03 g NH}_{3}} \text{ or } \dfrac{\text{17.03 g NH}_{3}}{\text{3.024 g H}}[/tex]
We want to find grams of H, so we choose the one with grams of H on top.
[tex]\text{Mass of H} = \text{2.5 g NH}_{3} \times \dfrac{\text{3.024 g H}}{\text{17.03 g NH}_{3}} = \textbf{0.44 g H}\\\\\text{The mass of H is $\large \boxed{\textbf{0.44 g}}$}[/tex]
Fossil fuels, like coal, oil, and natural gas, are huge, carbon-rich deposits that essentially trapped carbon for millions of years (until humans started burning them for energy).
True or False
Answer:
True!
Explanation:
Fossil fuels are carbon based compounds present deep in the earth left millions of years ago.
hope it helps!
Icp need help of available
Answer:
True statements: B and C
Explanation:
A is not true NaCl is product
D is not true the reaction occurs
As the temperature of a fixed volume of a gas increases, the pressure will _____. A. vary inversely B. increase C. decrease D. not change
Answer:
increases
Explanation:
As the temperature of a fixed volume of a gas increases, the pressure will increase.
What is Gay Lussac's law?
According to this law at constant volume of gas, pressure is directly proportional to the temperature of the gas and it is represented as:
P ∝ T.
It means that if pressure increases then temperature is also increases or if pressure decreases then temperature will also decreases.
So, pressure of the gas increases.
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Help me!
what is the biggest disadvantage of using nuclear power to produce electricity?
a. nuclear fission releases more air pollution than burning coal
b. nuclear fission produces less energy than burning coal or oil.
c. nuclear waste must be safely stored for many years
d. nuclear waste must be incinerated
The biggest disadvantage of using nuclear power to produce electricity is the nuclear waste must be safely stored for many years.
What is nuclear power?Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from:
Nuclear fission Nuclear decay and Nuclear fusion reactionsNuclear reactions produces high amount of energy and many waste materials which are non degradable and will stay in the environment for the long time.
Hence, nuclear waste must be safely stored for many years.
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Which sentence best describes part of the process for generating electricity in a nuclear power plant?
A.Atoms Join together to produce water molecules.
B.An atom releases electrons, producing an electric current.
C.Protons and neutrons Join together to create atoms.
D.Heat is released when atomic nuclel split.
Answer:it is D
Explanation: it is only one that makes sense
A balloon filled with air has a volume of 6.50 L, a pressure of 0.900 atm, and a temperature of 25.0oC. If it is left out overnight, during which the temperature decreases to 15.0oC and the pressure rises to 1.15 atm, what will the volume of the balloon be?
Answer:
4.92 L
Explanation:
Rearrange ideal gas law and solve.
Change C to K.
- Hope that helps! Please let me know if you need further explanation.
Which of these Electromagnetic waves has the most kinetic energy and can be
dangerous?
O radio waves
O gamma rays
O ultraviolet waves
O visible light
Answer:
Gamma Rays.
Explanation:
Gamma-ray photons have the highest energy in the EMR spectrum and their waves have the shortest wavelength.
How many moles of gas fill a 2.2 L vessel with a pressure of 1.2 atm at 25.0 °C?
P=
V=
n=
R=
T=
Formula:
Answer:
Do you still need this answer? If you do i can provide it for you still
Thank you
Need help with these three pls!!!!!
aight imma let you guys i
Answer:
b
Explanation:
it is right
