Answer:
Volume of CHCl3 required, V(CHCl3) = 8.02 mL
Volume of CHBr3 required, V(CHBr3) = 11.98 mL
Explanation:
Note: The complete question is incomplete. The complete question is given below:
Suppose now that you wanted to determine the density of a small yellow crystal to confirm that it is silicon. From the literature, you know that silicon has a density of 2.33 g/cm3. How would you prepare 20.0 mL of the liquid mixture having that density from pure samples of CHCl3 (d = 1.492 g/mL) and CHBr3 (d = 2.890 g/mL)? (Note: 1 mL = 1 cm3.)
V(CHCl3) = mL
V(CHBr3) = mL
Density of required mixture of CHCl3 and CHBr3 equals the density of silicon = 2.33 g/mL
Density of CHCl3 = 1.492 g/mL
Density of CHBr3 = 2.890 g/mL
Let the fraction of CHCl3 required be y
Fraction of CHBr3 required will be 1 - y
Density of mixture = ( fraction of CHCl3 * density of CHCl3) + (fraction of CHBr3 * density of CHBr3)
2.33 = (y * 1.492) + (1 - y) * 2.890
2.33 = 1.492y + 2.890 - 2.890y
-0.56 = -1.398y
y = 0.401
Therefore, volume of CHCl3 required = 0.401 * 20 mL = 8.02 mL
Volume of CHBr3 required = (20 - 8.02) = 11.98 mL
A chemistry student is recording the electric charges of some atoms. Use the results in the chart to answer the following questions.
Atom Electric Charge
Carbon −4
Nitrogen +5
Oxygen −2
Part A:
Write an equation to find the difference in electric charge between the Nitrogen atom and the Oxygen atom.
Part B:
Using the equation you wrote in Part A, what is the difference in electric charge between the two atoms?
HELPPPPPPPPPPPP
In order to carbonate soda, soda companies have to compress carbon dioxide close to 1250 mL of carbon dioxide at a pressure of 1.00 atm into a can with a volume of 225 mL. What is the pressure of carbon dioxide inside the soda can?
HELPPPPPPPP
Answer:
Pressure inside soda can = 5.56 atm
Explanation:
Given data:
Initial volume = 1250 mL
Initial pressure = 1.00 atm
Final volume = 225 mL
Final pressure = ?
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
1.00 atm × 1250m L = P₂ × 225 mL
P₂ = 1250 atm. mL/ 225 mL
P₂ = 5.56 atm
is the biosphere contains only non-living thing true or false
Answer:
False
Explanation:
It’s both living and non living
Answer:
False
Explanation:
In biospheres, there are both living and nonliving objects present! There are typically large abundances of living objects, such as animals, trees, grass, etc. There are also nonliving objects included in biospheres that are necessary for the prosperity of the living creatures! Examples of these nonliving objects include water for hydration, air for breathing, soil for growth, etc. A biosphere is where all living things are found on Earth, so the question is false since both types of things are found within them and not just nonliving things!
If an effusion experiment, it required 45 seconds for
a certain number of moles of an anknown gas to pass through
a small orifice into a vacuum. Under the same conditions, It required 18 seconds for the same number of moles of oxygen to effuse. Find the molecular mass of the unknown gas.
Answer: A vacuum. Under the same conditions 16 s were required for the same number of moles of O2 to effuse. ... The molar mass of the unknown gas is 200 g/mol. calculation ... QUESTION 1 If gas-burning appliances are vented into an unlined masonry chimney, deteriorate and crumble and may · PLS HELP
Explanation:
Please answer question #4
Answer:
F=500×3 = 1500 N
W = 1500×10 =15000 Nm
When Nitrogen gas gets cold enough it can form a liquid. This liquid nitrogen is an
example of what?
A. A chemical change because it took a significant temperature drop to convert
nitrogen from gas to liquid.
B. A chemical change because the nitrogen underwent a conversion from gas to a
liquids.
C. A physical change because it was only a state change from solid to liquid.
D. A physical change because the temperature drop causes the molecules to completely rearrange.
Answer:
C.
Explanation:
Phase change is physical.
When Nitrogen gas forms a liquid is a physical change because it was only a state change from solid to liquid. Therefore, option C is correct.
What is a physical change?A physical change takes place when some of the features of the matter change but the identity of the material does not. Physical changes can be categorized as reversible and irreversible. For example, the melting of water is reversible since the melted ice can be refrozen.
Physical change can be described as a kind of change where only physical properties of matter such as solubility, color, odor, etc. can change. During physical changes in matter, there will be no chemical bonds are broken or formed between atoms in the molecule.
The chemical composition as well as the chemical nature of the material will remain unchanged while a physical change. The molecules can rearrange without changing the internal chemical composition of matter.
Therefore, changing the state of nitrogen gas is a physical change.
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A crest of a wave with an amplitude of 3 meters intersects with another trough of a wave with an amplitude of 2 meters. What is the resulting amplitude?
3 meters
2 meters
6 meters
1 meter
Answer:
A 3 meters
Explanation:
A crest of the wave is the highest peak in the wave that shows the maximum displacement value. The intersection of the 3-meter and 2-meter waves results in amplitude of 1 meter. Thus, option D is correct.
What is amplitude?The amplitude of the wave is the measurement of the wave from the still position towards the crest or the trough of the wave. It is estimated in meters.
The elevation of the wave is at 3, and the depression is at 2 meters when intersected, which results in an amplitude causing destructive interference. As 3 m is above the baseline and 2 m is below the baseline the resulting amplitude will be, 3 - 2 = 1 m.
Therefore, the resulting amplitude is 1 meter.
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Which best replaces the question mark?
Answer:Waves.sry if this is wrong.
Explanation:
How many moles of platinum atoms are in 2.408 x 1023
answer:
The mass of 4×10²¹ atoms Pt is ≈ 1 g Pt.
explanation:
The ability of carbon to attract electrons is
Answer:
Electronegativity is the relative ability of an atom involved in covalent bonding to pull electrons toward itself.
Answer:
Electronegativity
Explanation:
Electronegativity is the ability of an atom to attract electron.
Electronegativity increases as it get closer to fluorine since fluorine is the most electronegative element.
how would you separate the components in a mixture of chlorine and hydrogen gas
3. Which of the following elements is more reactive than potassium, K?
a. Sodium, Na
b. Copper, Cu
C. Vanadium, V
d. Caesium, Cs
Answer:
d. Caesium
Explanation:
Actually Rubidium is more reactive than potassium but since it is not in the options given, Caesium is the next most reactive
How many molecules OF2 would have a mass of .132 g
1.47 × 10²¹ molecules OF₂
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 TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional Analysis Explanation:Step 1: Define
0.132 g OF₂
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of O - 16.00 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of OF₂ - 16.00 + 2(19.00) = 54.00 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 0.132 \ g \ OF_2(\frac{1 \ mol \ OF_2}{54.00 \ g \ OF_2})(\frac{6.022 \cdot 10^{23} \ molecules \ OF_2}{1 \ mol \ OF_2})[/tex]Divide/Multiply: [tex]\displaystyle 1.47204 \cdot 10^{21} \ molecules \ OF_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.47204 × 10²¹ molecules OF₂ ≈ 1.47 × 10²¹ molecules OF₂
According to cell theory, where do plant cells come from?
A) organelles
B) other plant cells
C) protein synthesis
D) chemical reactions
Please help!
What increases pressure?
a
more particles and higher temperatures
b
higher volume
c
number of particles
d
higher temperature
Answer:
A
Explanation:
more particles means things are heating up
Ex: Water. More bubbles form once water reaches it boiling point
a.
Na3PO4 + _HCI - H3PO, + _NaCl
What type of reaction and balance the equation
Answer:
Molar Mass
Explanation:
By how much will the speed of a body of fixed mass, increase if its kinetic energy becomes four times its initial kinetic energy?
Answer:
Therefore, when the kinetic energy increases by four times, then the moment will increase by two times.
Answer:
speed will also increase in 4 time
Which element could provide one atom to make an ionic bond with oxygen?
Answer:
Magnesium
Explanation:
The element that could provide one atom to make an ionic bond with oxygen is magnesium.
Generally, most group II elements will form an ionic bond with oxygen with just one atom.
An ionic bond forms by the transfer of electrons from one specie to another.
Oxygen has a charge of 2-, to use one atom to form ionic bond with this specie, a magnesium atom with 2+ charge will bond with the specie.
This will form:
MgO
This is notable for other group II elements.
What does the Theory of Plate Tectonics state
The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.
Answer:
the theory of plate tectonic state that the plates move due to asthosphere
How does changing the initial mass of the cooper affects how much heat energy it has?
I need help on this question?
In order to properly calculate how much reactant needs to be used in a chemical reaction to produce a specific amount of product, what method of chemical calculation must be used
Answer:
First, a mandatory stoichiometric balance must be made, and second, the degree of purities and impurities that the reagents have must be analyzed to see how many products they would have.
It is essential that this is taken into account since not all chemical compounds (reactants) are 100% pure and therefore their entirety does not become a product.
Explanation:
As for the stoichiometric balance, it is fundamental since if the equation is not balanced all the data will be wrong.
Many times the quantity in grams and another measurement of the products are obtained, taking into account a standard value of how many reactants will give x quantity of products, a simple rule of three could be made and thus be able to determine in a simpler way how many reactants were catalyzed in reaction.
To calculate the specific amount of reactant and product, the stoichiometry method is used.
What is the Stoichiometry method?Stoichiometry is the science of calculating the quantities of components involved in chemical processes.
To understand stoichiometric calculations, first, we balance the equation. To balance an equation, count the number of atoms of the compound on both sides.
If the quantity is not the same, then balance the equation first.
Then, The stoichiometric coefficients' ratio is used to calculate the mole ratio between two components in a chemical process.
We can write mole ratios using these numerical connections, which allow us to translate between amounts of reactants and/or products.
Thus, calculate the stoichiometry problems.
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What property can be used to separate oil from milk?
a. Magnetism
b. Density
c. Electricity
Answer:
Density oil will float
Explanation:
5) It is not safe to put aerosol canisters in a campfire, because the pressure inside the canisters gets very high and they can explode. If I have a 1.0 liter canister that holds 2 moles of gas, and the campfire temperature is 14000 C, what is the pressure inside the canister?
Answer:
P = 2343.65 atm
Explanation:
Given data:
Volume of container = 1.0 L
Number of moles of gas = 2 mol
Temperature = 14000 °C
Pressure of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
14000+273.15 = 14273.15 K
by putting values,
P × 1.0 L = 2 mol ×0.0821 atm.L /mol.K × 14273.15 K
P = 2343.65 atm.L / 1.0 L
P = 2343.65 atm
Explain using specific
examples how the skeleton
provides the body with
physical protection and
protection against
infection. (6 marks)
Answer:
dysrdtsrjhtkssxxjtcftj
Answer:
The vertebral column holds the body upright. Movement - muscles are attached to bones, which are jointed. When the muscles contract the bones move. Blood production - red blood cells (to carry oxygen) and white blood cells (to protect against infection) are produced in the bone marrow of some bones.
Which of the following gas samples would have the largest volume, if all samples are at the same temperature and pressure?
a 0.498 moles CO2
b 19.91 grams of Ar
c They would all have the same volume
Answer:
They would all have the same volume.
Explanation:
Let us consider the same temperature and pressure of both Ar and CO₂ is standard temperature and pressure.
Standard temperature = 273.15 K
Standard pressure = 1 atm
Number of moles of CO₂ = 0.498 mol
Volume of CO₂ = ?
Solution:
PV = nRT
R = general gas constant = 0.0821 atm.L /mol.K
1 atm × V = 0.498 mol × 0.0821 atm.L /mol.K × 273.15 K
1 atm × V = 11.17 atm.L
V = 11.17 atm.L/1 atm
V = 11.17 L
Volume calculation for Ar:
Number of moles of Ar:
Number of moles = mass/molar mass
Number of moles = 19.91 g /39.95 g/mol
Number of moles = 0.498 mol
Number of moles are same thus it will occupy same volume. We can prove it through calculation given below,
PV = nRT
R = general gas constant = 0.0821 atm.L /mol.K
1 atm × V = 0.498 mol × 0.0821 atm.L /mol.K × 273.15 K
1 atm × V = 11.17 atm.L
V = 11.17 atm.L/1 atm
V = 11.17 L
which structure below represents the arrangement of atoms in pure copper ?.
Consider the heating curve for water. At what temperature does the solid start melting? –20°C 0°C 20°C 80°C
Answer:
0°C
Explanation:
The melting point of water - the temperature at which solid water begins to melt - is 0°C at a pressure of 1 atm. In the heating curve of water, below 0°C we have solid water. Then, at 0°C the solid water starts to melt by forming liquid water. Above 0°C, when the total amount of water is in the liquid state, the liquid water begins to heat (it increases its temperature).
Answer:
the answer is 0 degrees C.
Explanation:
How many elements are there in world
Answer:
4
Explanation:
earth
wind
water
fire
Answer:
Explanation:
There are total 118 elements in the world.
Is an isotope more or less stable the longer the half life?