Answer:
1, 3, 2
Explanation:
N2 + H2 → NH3
I usually find that the best way to systematically balance an equation by inspection is to start with the most complicated-looking formula and then balance atoms in the order:
All atoms other than O and H O H(a) The most complicated formula is NH3.
(b) Balance N.
We have 1 H in NH3, but 2 N on the left. We need 2 N on the right. Put a 1 in front of N2 and a 2 in front of NH3.
1N2 + H2 → 2NH3
(c) Balance H.
We have fixed 6 H on the right, so we need 6 H on the left. Put a 3 in front of H2.
1N2 + 3H2 → 2NH3
The equation is now balanced, and the coefficients are 1, 3, 2.
What is the approximate percent by mass of oxygen in C2H4O2
Answer:
Approximately 53.3 %.
Explanation:
Molar mass of C2H4O2
= 2 * 12.011 + 4 * 1.008 + 2 * 15.999
= 60.052
% oxygen = (31.998* 100) / 60.052 = 53.28 %
someone please help
Answer:
A - 8
B - 8
C - O
D - 26
E - 30
F - Fe
Explanation:
Use these things:
1. A = Z + N,
where A - mass number,
Z - atomic number,
N - number of neutrons
2. atomic number = number of protons
A drought is a long period of dryness. If animals fight during a drought, which basic need is most likely limited? water supply shelter or space the ability to reproduce the availability of sunlight
Answer:
Water supply
Explanation:
When there is drought, which happens mostly within the tropics, water sources go dry. Plants and animals suffer alike. Animals have to scramble for the limited amount of water to quench their thirsts. Water is one of the basic requirements for the survival of living organisms like animals.
Answer:
water supply
Explanation:
At a temperature of 15 degrees C, a quantity of oxygen has a volume of 250 ml. If it’s temperature is raised to 45 degrees C, what will it’s volume be?
Answer:
280 mL
Explanation:
Ideal gas law:
PV = nRT
Rearranging:
V / T = nR / P
At constant pressure:
V₁ / T₁ = V₂ / T₂
Substituting values:
250 / (15 + 273) = V / (45 + 273)
V = 276
Rounded to two significant figures, the volume will be 280 mL.
When using the ideal gas law, remember to always use absolute units for temperature, like Kelvin.
Final answer:
The volume of oxygen, initially at 250 ml and 15 degrees Celsius, will increase to approximately 275.5 ml when the temperature is raised to 45 degrees Celsius, according to Charles's Law.
Explanation:
The volume of a quantity of oxygen gas changes with temperature, which can be explained by Charles's Law. This law states that at constant pressure, the volume of a gas is directly proportional to its absolute (Kelvin) temperature. To find the new volume at a higher temperature, you can use the formula V₁/T₁ = V₂/T₂, where V₁ and T₁ are the initial volume and temperature, and V₂ and T₂ are the final volume and temperature.
To apply this to the student's question: The oxygen has an initial volume (V₁) of 250 ml at an initial temperature (T₁) of 15 degrees Celsius, which converts to 288.15 K (Celsius to Kelvin: C + 273.15). The final temperature (T₂) is 45 degrees Celsius or 318.15 K. Applying Charles's Law, we get:
250 ml / 288.15 K = V₂ / 318.15 K
Multiplying both sides by 318.15 K to solve for V₂ gives us:
V₂ = (250 ml * 318.15 K) / 288.15 K
V₂ ≈ 275.5 ml
So, when the temperature is raised to 45 degrees Celsius, the volume of oxygen will be approximately 275.5 ml.
What is the name of this hydrocarbon?
A. 1-methylbutane
B. 2-methylbutane
C. 2-methylpropane
D. 3-methylpropane
Answer:
C. 2-methylpropane
Explanation:
There are rules guiding the naming of hydrocarbons. Some of the rules are:
1.) The longest continuous chain is the parent chain:
The longest chain here is made up of 3-carbon atoms which is a propane compound
2.)The carbon atoms are numbered in the parent chain to indicate where branching or substitution takes place.
Here, it is in the second carbon atom in propane.
The branched group is methyl- which is a methane molecule that has lost a hydrogen atom.
This makes ths name of the compound to be:
2-methylpropane
Answer: C.
Explanation:
You are conducting an experiment on how increasing pressure during a deep sea dive affects gases in the blood. Which unit would be appropriate for your measurements?
Answer:
Pascals
Explanation:
Pascals are the unit for pressure
Answer: Pascal
Explanation: Pascal(Pa) is the unit of pressure according to Internataional Standard of units.
One Pascal is equivalent to the one newton(N) of force applied over an area of 1 metre squared(m2).
Thus when we are conducting an experiment on how increasing pressure during a deep sea dive affects gases in the blood, then Pascal is the most appropiate unit of measurement.
Hear flows from water in one container to another. What difference between the two samples of water causes heat to flow?
A)one sample must have dissolved materials within it
B)one sample must contain more water molecules than the other
C)one sample must be cooler than the other
D)one sample must have more mass than the other
In order for heat transfer between bodies from one container to another, one sample must be cooler than the other.
When there is a temperature difference between two substances , energy flows in the form of heat from the warmer to the cooler body until the temperature of both the body reaches equilibrium or same. This process is commonly known as heat transfer.This is according to second law of thermodyanimcs
In summary, heat flows due to a temperature gradient or temperature difference . The substance at a higher temperature will lose energy while the substance at a lower temperature gains energy in the form of heat. This flow continues until both the body reaches an equal temperature
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How are polyatomic ions named when found in ionic compounds?
a. their endings are changed to -ide
b. their endings are changed to -ite
c. their names are the same as the polyatomic's name
d. they do not appear in ionic names
Answer:
the answer is letter d
Polyatomic ions are named similarly to monatomic ions in ionic compounds. No changes are made to the ending of the polyatomic ion. The name of the compound is formed by combining the cation and the anion.
Explanation:Compounds containing polyatomic ions are named similarly to those containing only monatomic ions, except there is no need to change to an -ide ending, since the suffix is already present in the name of the anion. For example, if we have the compound NaNO3, it is named as sodium nitrate. Similarly, CaCO3 is named as calcium carbonate, and NH4Cl is named as ammonium chloride.
In ionic compounds, polyatomic ions are named similarly to monatomic ions. The ending of the polyatomic ion remains unchanged. The name of the compound is formed by combining the cation and the anion.
For example, in the compound sodium nitrate (NaNO3), the polyatomic ion is nitrate (NO3-). The name of the compound is formed by combining the cation (sodium, Na+) and the anion (nitrate, NO3-).
Similarly, in calcium carbonate (CaCO3), the polyatomic ion is carbonate (CO3^2-). The name of the compound is formed by combining the cation (calcium, Ca^2+) and the anion (carbonate, CO3^2-).
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Aluminum sulfate is analyzed, and the sample contains 0.0670 moles of sulfate ions. How many moles of aluminum are in the sample?
Answer:
0.0447 moles of Aluminum
Explanation:
Break this down to an ionic equation (which may not exist in the real world but it will give you the mol ratios).
Al2(SO4)3 ===> 2Al^(+3) + 3 SO4^(-2)
Now write the equation showing the actual number of moles of SO4^(-2) present. Indicate the Al moles with an x
Al2(SO4)3 ===> 2Al^(+3) + 3 SO4^(-2)
x 0.0670
Now set up a proportion
2/x = 3/0.0670 Cross multiply
2*0.0670 = 3x Simplify the left
0.134 = 3x Divide both sides by 3
0.134/3 = 3x/3 Divide
0.0447 = x
there are 0.0447 moles of Aluminum
What are the two gases that escaped Earth's atmosphere during early formation?
A. Helium and nitrogen
B. Helium and oxygen
C. Hydrogen and helium
D. Hydrogen and nitrogen
Answer: Option (C)
Explanation: Hydrogen and Helium initially, both were present on the earth's atmosphere. But later they were reduced upto a huge extent. Due to the location of earth near to the sun, these gases must have evaporated from the earth's atmosphere. At present the amount of hydrogen and helium is very less.
Thus, the correct answer is option (C).
Which of the following is the best definition of a scientific theory? A predicted experimental outcome A mathematical model (an equation) A prediction of how a natural phenomenon will behave A well tested explanation of a natural phenomenon
Answer:
A well tested explanation of a natural phenomenon
Explanation:
A scientific theory is an explanation of a natural phenomenon which has been drawn from a well tested observation.
Theories are products of repeated scientific experiments. When a hypothesis otherwise known as a "scientific guess" survives a lot of scrutiny, we can elevate it to the status of a theory. Most theories starts off from simple observations. These observations can further spark series of experiments in such a field and a scientific guess proposed. Further testing and experimenting would now lead to a theory.
How many atoms of carbon are combined to with 2.81 moles of hydrogen atoms in a sample of the compound ethane, C2H6?
Answer:
5.64×10²³ atoms C
Explanation:
Convert moles of H to moles of C:
2.81 mol H × (2 mol C / 6 mol H) = 0.937 mol C
Convert moles of C to atoms of C:
0.937 mol C × (6.02×10²³ atoms C / mol C) = 5.64×10²³ atoms C
In the equation Ca(s) + 2H2O(l) -->Ca(OH)2(aq) + H2(g), list each element used as a reactant, and tell how many atoms of each are needed for this reaction.
Answer:
See below
Explanation:
Ca + 2H2O → Ca(OH)2 + H2
The elements involved are:
Ca — calcium H — hydrogen O — oxygenThe numbers of each atom are:
1 atom Ca 4 atoms H 2 atoms OThe 2 in front of H2O multiplies everything in the H2O.
Which of the following best describes a fission reaction involving lithium? (1 point)
A. Two lithium atoms form bonds with each other, absorbing a large amount of energy.
B. The nuclei of lithium atoms join together to form heavier isotopes, and energy is released.
C. An atom of lithium absorbs electrons, undergoes an increase in energy level, and splits into fragments.
D. The nucleus of an atom of lithium splits, resulting in smaller fragments and the release of a large amount of energy.
Answer:
D. The nucleus of an atom of lithium splits, resulting in smaller fragments and the release of a large amount of energy.
Explanation:
Fission is the splitting of a nucleus, so this is the only option that involves fission.
A is wrong. Li atoms do not bond to form molecules. Instead, the nuclei are immersed in a sea of electrons.
B is wrong. The joining of two nuclei is fusion.
C is wrong. Adding an electron to an atom of lithium is not a nuclear reaction.
The nucleus of an atom of lithium splits, resulting in smaller fragments and the release of a large amount of energy. Therefore, option D is the correct answer.
Nuclear fission is a reaction in which a heavy nucleus splits into two or more smaller nuclei. Some characteristics features of nuclear fission are,
It produces free neutrons and gamma rays.It produces very large amount of energy.It is a form of nuclear transmutation.Thus, we can conclude that, in nuclear fission lithium atom is splits into smaller fragments with the release of a large amount of energy. Therefore, option D is the correct answer.
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1. Complete the reaction illustrating the hydration reaction of a strong electrolyte CaCl2
Answer:
CaCl₂(s) ⟶ Ca²⁺(aq) + 2Cl⁻(aq)
Explanation:
When the calcium chloride dissolves. the calcium and chloride ions leave the surface of the solid and go into solution as hydrated ions.
Methane burns in oxygen to produce carbon dioxide and water. Which of the following represents
correct chemical formulas?
reliminary, unbalanced equation with the
A. CH4 + O2 - CO2 + H20
B. CH4 + CO2 + O2 + H2O
C. CO2 + H20 - CH4 + O2
D. CH4 - O2 + CO2 + H20
Answer:
A
Explanation:
CH4+O2-CO2+ H20
that mean methane has burn in oxygen to produce CO2
A sample of cesium carbonate, weighing 3.80 g, requires 1.90 g of hydrogen bromide gas to completely decompose to water, cesium bromide, and carbon dioxide gas. The total mass of water and cesium bromide formed is 5.20 g and no hydrogen bromide or cesium carbonate remains. According to the law of conservation of mass, what mass of carbon dioxide must have been formed?
A. 0.50 g
B 1.40 g
C 5.49 g
D 10.90 g
E 1.90 g
PLEASE GIVE ME AN EXPLANATION ON WHY IT IS THE CORRECT ANSWER.
Answer:
Choice A. 0.50 g.
Explanation:
According to the question, the reaction here converts
caesium (cesium) carbonate and hydrogen bromideto
cesium bromide, carbon dioxide, andwater.By the Law of Conservation of Mass, matter can neither be created nor destroyed in a chemical reaction. (Shrestha et. al, Introductory & GOB Chemistry, Chemistry Libretexts, 2019.)
In other words, the mass of the reactants, combined, shall be the same as the mass of the products, combined.
What's the mass of the reactants?
[tex]\rm \underbrace{\rm 3.80\;g}_{\mathrm{Cs_2CO_3}} + \underbrace{\rm 1.90\; g}_{\mathrm{HBr}} = 5.70\;g[/tex].
What's the mass of the products?
Let [tex]m(\mathrm{CO_2})[/tex] represent the mass of carbon dioxide produced in this reaction.
The mass of the products will be:
[tex]\rm \underbrace{\rm 5.20\;g}_{\mathrm{CeBr}\text{ and }\mathrm{H_2O}} + \underbrace{m(\mathrm{CO_2})}_{\mathrm{CO_2}}[/tex].
The two masses shall be equal. That is:
[tex]\rm 5.20\; g + \mathnormal{m}(\mathrm{CO_2}) = 5.70\;g[/tex].
[tex]m(\mathrm{CO_2}) = \rm 0.50\;g[/tex].
In other words, by the Law of Conservation of Mass, the mass of carbon dioxide produced in this reaction will be [tex]\rm 0.50\;g[/tex].
During a combustion reaction, 5.00 grams of oxygen reacted with 5.00 grams of CH4.
What is the amount of the leftover reactant?
4.00 grams of methane
3.75 grams of methane
2.25 grams of oxygen
1.75 grams of oxygen
Answer:
3.75 grams of methane
Explanation:
Given parameters:
Mass of oxygen gas = 5g
Mass of CH₄ = 5g
Unknown parameters:
Amount of excess reactant = ?
Solution
In order to find the amount of leftover reactant we need to know the reactant that is in excess and in limited supply. The amount of reactant in short supply will determine the extent of the reaction.
Now, we need to write the balanced reaction equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
We first find the number of moles of the reactants.
Number of moles of methane = [tex]\frac{mass}{molar mass}[/tex]
Number of moles of methane = [tex]\frac{5}{16}[/tex] = 0.3125mole
Number of moles of oxygen = [tex]\frac{5}{32}[/tex] = 0.156mole
From the equation:
1 mole of methane reacts with 2 moles of oxygen gas
x moles of methane reacts with 0.156moles of oxygen gas
2x = 0.156
x = 0.078moles
We see that the methane is in excess and oxygen gas is in short supply in the reaction.
The amount of excess methane = 0.3125 - 0.078 = 0.2345moles
Now we convert it to mass:
Mass = number of moles x molar mass = 0.2345 x 16 = 3.75grams
Answer:
3.75 grams of methane
Explanation:
Got it right on the exam
What is the volume of a tank of nitrogen if it contains 17 moles of nitrogen at 34 C under 12,000 Pa?
A. 0.40 m3
B. 3.62 m3
C. 2.29 m3
D. 20.76 m3
B. 3.62 m3
PV = nRT
(0.1185 atm)V = (17 mol)(0.0821 L•atm/K•mol)(307.15 K)
0.1185V = 428.689
V = 3617.63 L
so for cubic meters, 1,000 liters equals 1 m^3. Simply divide the answer by 1,000.
The volume that this would occupy is 3.62 m^3.
what is volume with example?volume is the measure of the capacity that an item holds. for example, if a cup can hold one hundred ml of water up to the brim, its volume is said to be one hundred ml. volume also can be defined as the amount of area occupied by a three-dimensional object.
volume refers to the amount of area the object takes up. In other words, volume is a measure of the size of an object, just like height and width are methods to describe size. If the object is hollow (in other words, empty), volume is the amount of water it can hold.
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How many moles are in 64 grams of methane, CH4?
A. 4
B. 32
C. 64
D. 13
Answer:
A. 4.
Explanation:
We can use the relation:no. of moles (n) = mass/molar mass.
mass = 64.0 g, molar mass = 16.0 g/mol.
∴ no. of moles (n) = mass/molar mass = (64.0 g)/(16.0 g/mol) = 4 mol.
Final answer:
To find the number of moles of methane in 64 grams, divide the mass by the molar mass of methane, which is 16.05 g/mol. The result is approximately 4 moles of CH₄. Option A
Explanation:
To calculate the number of moles in 64 grams of methane (CH₄), we need to use the molar mass of methane as a conversion factor. Methane has a molar mass of approximately 16.05 g/mol (carbon is 12.01 g/mol and hydrogen is approximately 1.008 g/mol × 4). Therefore, the calculation is as follows:
Number of moles of CH₄ = Mass of CH₄ ÷ Molar mass of CH₄
Number of moles of CH₄ = 64 g ÷ 16.05 g/mol
Number of moles of CH₎ = 3.9875 mol
When rounded to the nearest whole number, the number of moles of methane in 64 grams is approximately 4.
An atom of boron has an atomic number of 5 and an atomic mass of 11. The atom contains
5 protons, 6 electrons, and 5 neutrons.
11 protons, 11 electrons, and 5 neutrons.
5 protons, 5 electrons, and 6 neutrons.
11 protons, 6 electrons, and 6 neutrons.
Answer:
It is C.
Explanation:
The atomic mass = number of protons + number of neutrons
= 5 + 6 = 11. The number of protons = the number of electrons.
Final answer:
A boron atom with an atomic number of 5 and an atomic mass of 11 contains 5 protons, 5 electrons, and 6 neutrons.
Explanation:
An atom of boron has an atomic number of 5 and an atomic mass of 11. The atomic number tells us that there are five protons in the nucleus of a boron atom. Given that the atomic mass is the sum of the protons and neutrons, and the atomic mass of boron is 11, we can deduce that there must be 6 neutrons (11 - 5 = 6). Boron atoms also have an equal number of electrons as protons when they are neutral. Therefore, the correct composition of a neutral boron atom is 5 protons, 5 electrons, and 6 neutrons.
Boron has two naturally occurring isotopes, boron-10 and boron-11, which differ only in their number of neutrons. Isotopes are variants of the same element that have the same number of protons but a different number of neutrons. Boron's average atomic mass is calculated based on the relative abundance of its isotopes: 20% boron-10 (5 protons and 5 neutrons) and 80% boron-11 (5 protons and 6 neutrons).
What is the volume of a gas at 50.0°C and 0.80 atm, if there are 0.75 moles of the gas
present?
Answer: The volume of gas is 24.9 L. The volume can be calculated using the Ideal Gas Equation which relates the pressure, volume, temperature, and amount of gas to each other.
Further Explanation
The Ideal Gas Equation is:
[tex]PV = nRT[/tex]
where:
P - pressure (in atm)
V - volume (in L)
n - amount of gas (in moles)
R - universal gas constant [tex]0.08206 \frac{L-atm}{mol-K}[/tex]
T - temperature (in K)
In the problem, we are given the values:
P = 0.80 atm (2 significant figures)
V = ?
n = 0.75 moles (2 significant figures)
T = 50.0 degrees Celsius (3 significant figures)
We need to convert the temperature to Kelvin before we can use the Ideal Gas Equation. The formula to convert from degree Celsius to Kelvin is:
[tex]Temperature \ in \ Kelvin = Temperature\ in \ Celsius \ + \ 273.15[/tex]
Therefore, for this problem,
[tex]Temperature\ in \ K = 50.0 +273.15\\Temperature\ in \ K = 323.15[/tex]
Solving for V using the Ideal Gas Equation:
[tex]V = \frac{nRT}{P} \\V = \frac{(0.75\ mol) \ (0.08206 \ \frac{L-atm}{mol - K}) \ (323.15\ K) \ }{0.80 \ atm} \\V = 24.86\ L[/tex]
The least number of significant figures is 2, therefore, the final answer must have only 2 significant figures. Hence, the volume is 24.9 L.
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Keywords: Ideal Gas Law, Volume, Pressure
The volume of a gas at 50.0°C and 0.80 atm, with 0.75 moles of the gas present, is 24.93 L.
Explanation:The volume of a gas can be calculated using the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin. To calculate the volume, we can rearrange the equation to V = (nRT/P).
Using the given values, n = 0.75 moles, R = 0.08206 L-atm/mol-K, T = 50.0°C + 273.15 = 323.15 K, and P = 0.80 atm, we can plug them into the equation:
V = (0.75 mol x 0.08206 L-atm/mol-K x 323.15 K) / 0.80 atm = 24.93 L
Volume is a measure of the amount of space occupied by a three-dimensional object. It is typically measured in cubic units, such as cubic meters or cubic centimeters. The volume of an object can be calculated using various formulas, depending on the shape of the object. For example, the volume of a cube can be calculated using the formula V = s^3, where V is the volume and s is the length of one side of the cube. Similarly, the volume of a cylinder can be calculated using the formula V = πr^2h, where V is the volume, r is the radius of the base of the cylinder, and h is the height of the cylinder.
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Why Can alloys not be described using chemical formulas?
A) alloys are mixtures with undefined proportions
B) alloys are mixtures instead of compounds
C) alloys have a network structure called a crystal lattice
D) Alloys have a structure that lacks covalent bonds
Answer:
A) Alloys are mixtures with undefined proportions.
Explanation:
Alloys are different mixtures or different materials with no exact portion size.
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How many moles of iodine are in 0.333 mol of CaO(I03)2 ?
Answer:
0.666 mol I
Explanation:
0.333 mol CaO(IO₃)₂ × (2 mol IO₃ / mol CaO(IO₃)₂) = 0.666 mol IO₃
0.666 mol IO₃ × (1 mol I / mol IO₃) = 0.666 mol I
Water is a(n)______ molecule, and it easily dissolves _______ molecules. A. covalent, polar B. ionic, covalent C. ionic, ionic D. covalent, covalent
Answer:
A. covalent, polar
Explanation:
Water is a(n) covalent molecule, and it easily dissolves polar molecules.
Presuming that an ore sample is approximately 54% bauxite, how much Al could be extracted from 1 kg of ore?
Answer:
0.187kg
Explanation:
Given parameters:
Percentage compostion of bauxite in ore = 54%
Mass of ore = 1kg
Unknown:
Mass of Al that can be extracted from the ore = ?
Solution
Bauxite is an ore of Aluminium. It is made up of several minerals from with aluminium can be extracted in economic amount. Some of these minerals are gibbsite, boehmite, diaspore etc. Let us assume that the ore we are dealing with contains chiefly gibbsite.
The formula of Gibbsite is Al(OH)₃
We know that 54% of the ore is made up of bauxite and the remaining 46% of the ore will form the gangue(not useful part of the ore)>
Let us find the mass of the bauxite contained in the ore:
Mass of bauxite = [tex]\frac{54}{100}[/tex] x 1kg = 0.54kg
Since we know the mass of bauxite in the ore now, we can estimate the mass of the aluminium in the ore.
First, we find the molar mass of the gibbsite:
Molar mass of Al(OH)₃ = 27 + 3(16 + 1) = 78gmol⁻¹
Atomic mass of aluminium is 27
Mass of aluminium that could be extracted = [tex]\frac{27}{78}[/tex] x 0.54
= 0.346 x 0.54
= 0.187kg
equation for the reaction of rubidium with an Arrhenius base
Answer:
No reaction.
Explanation:
An Arrhenius base (like NaOH) increases the concentration of hydroxide ions present in the solution.
If you add Rb to an aqueous solution of NaOH, you will get an explosion.
However, the Rb does not react with the OH^-. Instead, it reacts rapidly with the water.
2Rb + 2H2O → 2RbOH + H2
So much heat is generated that the hydrogen explodes:
2H2 + O2 → 2H2O
Electrolysis hydrocloric acid and both of the electrode uses a platinium electrode... what will happen to both of the electrode?
Answer:
Hydrogen gas is evolved at the cathode and chlorine gas at the anode.
Explanation:
The solution will ionise. Hydrogen ions, H+, will migrate to the negative cathode ( where the current leaves the solution and chloride ions Cl- will migrate the the positive anode.
In the electrolysis of hydrochloric acid using platinum electrodes, the anode will release chlorine gas, and the cathode will release hydrogen gas.
Explanation:In the electrolysis of hydrochloric acid, both electrodes (anode and cathode) will be made of platinum. When current is passed through the hydrochloric acid solution, at the anode, chloride ions (Cl-) will be oxidized to form chlorine gas (Cl2), and at the cathode, hydrogen ions (H+) will be reduced to form hydrogen gas (H2). Therefore, the platinum anode will release chlorine gas, and the platinum cathode will release hydrogen gas.
Which would be more toxic? An LD-25 or an LD-75 chemical? Select one: a. LD-25 b. LD-75 c. They are both equally toxic. d. Neither are toxic.
Answer:
b. LD-75
Explanation:
You give the same dosage of chemicals A and B to a sample of test subjects.
Chemical A kills 75 % of the subjects, while chemical B kills only 25 %.
Chemical A, with LD-75, is more toxic.
LD-75 would be more toxic. Hence, option B is correct.
What is the meaning of toxic?The quality of being toxic or poisonous.
You give the same dosage of chemicals A and B to a sample of test subjects.
Chemical A kills 75 % of the subjects, while chemical B kills only 25 %.
Chemical A, with LD-75, is more toxic.
Hence, option B is correct.
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What property or properties of gases can you point to support the assumption that most
of the volume in a gas is empty space?
Answer:
Compressibility, expandibility, and density, are the most conspicuous properties of the gases explained by the assumption that most of the volume in a gas is empty space.Explanation:
One of the assumptions of the kinetic molecular theory is that the gas particles are way smaller than the separtion between them and, in consequence, most of the volume in a gas is empty space.
This condition (that most of the volume in a gas is empty space) explains why the gases can be easily compressed: since there are vast unoccupied spaces when the pressure is increased, the particles can approach each other with which the total volume of the gas decreases.
Expandibility, the property of expanding, is the ability that gases have to occupy the entire space of the container in which they are located. The particles then will get separated leaving most of the space empty.
The fact that most of the volume in a gas is empty space means that the volume for a certain amount of particles is much larger than the volume that the same number of particles in a solid will occupy, driving to much lower densities.
Gases exhibit very low density, the ability to mix completely with other gases, and follow Avogadro's hypothesis, all of which support the assumption that a gas is mostly empty space.
Explanation:Properties of Gases and Empty Space
The properties of gases we observe can indeed support the assumption that most of the volume of a gas is empty space. One key property is the fact that gases have a very low density compared to liquids and solids. This low density occurs because the gas particles, which have mass, make up only a tiny fraction of the gas's volume. The rest is empty space that can be compressed or expand when the pressure or temperature changes.
Another supportive property is the ability of gases to mix completely with one another, without any significant interference from the size of their particles. This behavior also indicates that there is a lot of space between particles, allowing them to move freely and intermingle.
Moreover, Avogadro's hypothesis suggests that equal volumes of all gases, at the same temperature and pressure, contain equal numbers of molecules, thus underscoring the concept of empty space in gases since these molecules occupy negligible space compared to the whole volume.