Answer:
D
Explanation:if it was for A you wouldn't be taking pictures so therefore it would be D
Two Step Mole Conversions Practice
Solve the following two step mole conversion problem: 108 liters of CO at STP is equal to how many grams of CO?
grams CO
What steps should you take to respond to an
accident?
Notify the teacher immediately.
Notify the teacher only if the accident was not
your fault
Immediately wash off any chemicals on skin
or eyes with cool running water.
Remain calm and help others remain calm.
Pick up any broken glass and throw it in the
trash.
Answer:
Notify the teacher immediately.
Immediately wash off any chemicals on skin or eyes with cool running water.
Remain calm and help others remain calm.
Explanation:
Just did it on edge
Response to an accident can be made by informing the teacher, washing off chemicals ,being calm and picking of broken glasses.
Thus option A,C,D and E are correct.
What safety precautions are to be followed in laboratory?
While working in labs it is of utmost importance to work carefully while handling chemicals and glassware apparatus. In some unforeseen circumstances where accidents take place while working in labs it should be notified to the authorities immediately.
In case there is a spill of chemicals on skin or eyes it should be immediately washed under running water as the chemical spilled can cause irritation to the skin or eyes.In case of accidents it is advised to remain calm and calm others as well.
If there is a breakage of glassware it should be immediately be thrown away in the trash as the glass can pierce into the skin and cause injury.
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For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question. Check all that apply. CaCO3(g)→CaO+CO2(g) Na(s)+12Cl2(l)→NaCl(s) 2Na(s)+Cl2(g)→2NaCl(s) C(s,graphite)+O2(g)→CO2(g) CO(g)+12O2(g)→CO2(g) Na(s)+12Cl2(g)→NaCl(s)
The reactions for which ΔH∘rxn is equal to the ΔH∘f of the product(s) are: 2Na(s) + Cl₂(g) → 2NaCl(s), C(s, graphite) + O₂(g) → CO₂(g), and CO(g) + 1/2O₂(g) → CO₂(g).
The enthalpy change of a reaction, ΔH∘rxn, is defined as the difference between the enthalpy of the products and the enthalpy of the reactants. The enthalpy of the products can be expressed as the sum of the enthalpies of formation of each product, ΔH∘f, while the enthalpy of the reactants can be expressed as the sum of the enthalpies of formation of each reactant, also ΔH∘f. Therefore, if ΔH∘rxn is equal to the sum of the ΔH∘f values of the products, it means that the enthalpy change of the reaction is equal to the enthalpy of formation of the products.
1. CaCO₃(g) → CaO + CO₂(g)
The enthalpy change of this reaction is the difference between the enthalpy of the products (ΔH∘f of CaO and CO₂) and the enthalpy of the reactant (ΔH∘f of CaCO₃). However, since the products are two different substances, we cannot simply add their enthalpies of formation. Therefore, ΔH∘rxn is not equal to the sum of the ΔH∘f values of the products.
2. Na(s) + 1/2Cl₂(l) → NaCl(s)
The enthalpy change of this reaction is the difference between the enthalpy of the product (ΔH∘f of NaCl) and the enthalpy of the reactants (ΔH∘f of Na and Cl₂). Since there is only one product, we can equate ΔH∘rxn to the ΔH∘f of NaCl. Therefore, ΔH∘rxn is equal to the sum of the ΔH∘f values of the products.
3. 2Na(s) + Cl₂(g) → 2NaCl(s)
Enthalpy change of this reaction is the difference between the enthalpy of the product (ΔH∘f of NaCl) and the enthalpy of the reactants (ΔH∘f of Na and Cl₂). However, there are two moles of product, so we need to multiply ΔH∘f of NaCl by 2. Therefore, ΔH∘rxn is equal to the sum of the ΔH∘f values of the products.
4. C(s, graphite) + O₂(g) → CO₂(g)
The enthalpy change of this reaction is the difference between the enthalpy of the product (ΔH∘f of CO₂) and the enthalpy of the reactants (ΔH∘f of C and O₂). Therefore, ΔH∘rxn is equal to the sum of the ΔH∘f values of the products.
5. CO(g) + 1/2O₂(g) → CO₂(g)
The enthalpy change of this reaction is the difference between the enthalpy of the product (ΔH∘f of CO₂) and the enthalpy of the reactants (ΔH∘f of CO and O₂). Therefore, ΔH∘rxn is equal to the sum of the ΔH∘f values of the products.
6. Na(s) + 1/2Cl₂(g) → NaCl(s)
Similar to reaction 2, the enthalpy change of this reaction is the difference between the enthalpy of the product (ΔH∘f of NaCl) and the enthalpy of the reactants (ΔH∘f of Na and Cl₂). Therefore, ΔH∘rxn is equal to the sum of the ΔH∘f values of the products.
Therefore, the reactions for which ΔH∘rxn is equal to the ΔH∘f of the product(s) are: 2Na(s) + Cl₂(g) → 2NaCl(s), C(s, graphite) + O₂(g) → CO₂(g), and CO(g) + 1/2O₂(g) → CO₂(g).
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what is the house off Neutron
Answer: Jimmy Neutron 's House is host to Jimmy Neutron, Judy Neutron, Hugh Neutron, and Goddard. It is located on one side of the street from Cindy Vortex 's Building, both of which are located in Retroville, Texas, the United States of America, Alaska and Hawaii, North America and Planet Earth. Inhabitant: Jimmy Neutron.
Explanation:
2. explain how to take a mixed melting point and how you can use a mixed melting point to determine the identity of an unknown.
Taking a mixed melting point is a procedure used to identify the identity of an unknown compound.
What is melting point?Melting point is the temperature at which a solid substance changes from its solid state to a liquid state at a constant pressure. It is a characteristic property of a substance and is often used to identify and characterize compounds.
This process involves combining the unknown compound sample with another sample of a known compound of similar structure and melting point. Both samples are then heated up, and the resulting mixture of compounds is observed as it undergoes a single melting or boiling process. If the melting point of the unknown compound is close to that of the known sample, then it can be assumed that the unknown compound is of the same structure as its partner. Alternatively, if the melting point of the mixture is lower than that of the known sample, then it indicates that the unknown sample has a different structure than the known one. By measuring the peak of the melting point curve and comparing it to the literatures documented melting points, an unknown compound can be identified.
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What is the number of significant figures in each of the following measured quantities? 0.0105 L.
The measured quantity 0.0105 L has three significant figures. Significant figures are the digits in a measurement that convey precision, excluding leading zeros and trailing zeros without a decimal point.
In the measured quantity 0.0105 L, there are three significant figures. Significant figures are the digits in a measurement that indicate the precision and reliability of the value. The general rule for determining significant figures is as follows:
1. Non-zero digits are always significant. In this case, the digits "1", "0", and "5" are all non-zero and therefore significant.
2. Leading zeros (zeros at the beginning of a number) are not significant; they act as placeholders. In this measurement, the leading zero before the decimal point is not considered significant.
3. Zeros between significant digits are significant. There are no zeros between the significant digits "1", "0", and "5" in this case.
4. Trailing zeros (zeros at the end of a number) after a decimal point are significant. In this measurement, the trailing zero after the "5" is significant.
By applying these rules, we can determine that the measured quantity of 0.0105 L has three significant figures, representing the precision of the measurement to the hundredth place.
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what does Le châteliers principle state?
When 80.0 grams of calcium chloride react with silver nitrate, how many grams of silver
chloride are produced?
CaCl2 + 2 AgNO3 - Ca(NO3)2 + 2 AgCI
Answer:
Mass = 206.38 g
Explanation:
Given data:
Mass of calcium chloride = 80.0 g
Mass of silver chloride formed = ?
Solution:
Chemical equation:
CaCl₂ + 2AgNO₃ → Ca(NO₃)₂ + 2AgCl
Number of moles of CaCl₂:
Number of moles = mass/molar mass
Number of moles = 80.0 g/ 110.98 g/mol
Number of moles = 0.72 mol
Now we will compare the moles of CaCl₂ and AgCl
CaCl₂ : AgCl
1 : 2
0.72 : 2/1×0.72 = 1.44 mol
Mass of silver chloride:
Mass = number of moles × molar mass
Mass = 1.44 mol × 143.32 g/mol
Mass = 206.38 g
What BEST describes the Kleercut campaign?
Protesting rarely produces positive results.
Greenpeace’s tactics are similar to those of ecoterrorists.
Nonprofits have no role in determining forestry practices.
Nonprofits and corporations can work together to make sound policy.
Tactics are similar to those of ecoterrorists. This best describes the campaign. Therefore, the correct option is option B.
Natural Resources Defence Council, and others once engaged in a campaign against Kimberly-Clark known as campaigns. From 2004 to 2009, it took place. The largest producer of tissue products in the world, Kimberly-Clark is well known for its Kleenex brand.
Every year, the company buys from logging companies more than three million kilogrammes (3.4 million tonnes) of fibre. According to the marketing campaign, this fibre is made with old growth forest wood pulp. Tactics are similar to those of eco. This best describes the Kleercut campaign.
Therefore, the correct option is option B.
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How would an astronomer identify our home in the universe? Earth is in the solar system. The Milky Way is in the solar system. The solar system is next to the Milky Way. Earth is in the Milky Way and next to the solar system. The Milky Way is in the universe. The solar system is in the Milky Way. Earth is in the solar system. The universe is in the Milky Way. The Earth is in the Milky Way. Earth is at the center of the solar system.
Answer:
Earth is in the solar system.
Explanation:
Earth is our home and it is in the solar system.
Earth is the fifth-largest of the planets in the solar system and the third planet from the sun. Earth is the only planet having oxygen and water that supports life. Till now according to the research Earth is the only planet having life.
Planets are in the solar system, the solar system is in the milky way and the milky way is present in the universe. The astronomer identifies our home in the universe as "Earth is in the solar system" as Earth is our home.
Hence, the correct answer is "Earth is in the solar system."
Answer:
The Milky Way is in the universe. The solar system is in the Milky Way. Earth is in the solar system.
Explanation:
If the Milky Way Is in the universe and solar system you would know earth is also In the solar system, so "Our home planet is the third planet from the Sun, and the only place we know of so far that's inhabited by living things. While Earth is only the fifth largest planet in the solar system, it is the only world in our solar system with liquid water on the surface."
The mass of the sun is about 1.98 x 10^30 kilograms. The mass of the earth is 5.97x 10^24 kilograms. The mass of the sun is how many times greater than the mass of
the earth?
Answer:
Explanation:
The mass of the sun is about 1.98 x 10^30 kilograms. The mass of the earth is 5.97x 10^24 kilograms.
1.98 x 10^30 / 5.97x 10^24 = 331658 times greater
Answer:
Explanation:
The mass of the sun / the mass of the earth
= 1.98 x 10^30 / 5.97x 10^24
= 3.32 x 10^5 times greater
which example has particles that can be drawn closer to occupy smaller volume
One example of particles that can be drawn closer to occupy a smaller volume is a gas.
Understanding Gaseous StateIn the gaseous state, particles have high kinetic energy and are not strongly attracted to each other. They move freely and randomly, colliding with each other and the container walls.
Since there are minimal intermolecular forces holding them together, gas particles can be compressed or drawn closer together by reducing the volume of the container.
By decreasing the volume of a gas, such as by compressing it in a cylinder or container, the particles have less space to move around. They collide with each other more frequently, increasing the frequency of intermolecular collisions. As a result, the gas particles are drawn closer together, and the overall volume occupied by the gas decreases.
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Write balanced net ionic equation for the following reaction: Fe(OH)3(s) + H2SO4(aq) +? Express your answer as a chemical equation. Identify all of the phases in your answer
The balanced net ionic equation is as follows;
Fe(OH)₃ + H₂SO₄---> Fe₂(SO₄)₃+ H₂O
The transformations that take place as a result of a chemical reaction are represented by an equation called a chemical equation. The following is the standard format for a chemical equation:
Reactants -----> Products
One example of a straightforward chemical reaction is the formation of water through the combination of hydrogen (H₂) and oxygen (O₂) in the atmosphere (H₂O). Hydrogen and oxygen are the reactants in this reaction, and the result of the reaction is water. In order to create the chemical equation for this reaction, you would first start by writing the reactants on the left and the product on the right, with an arrow connecting the two to represent the direction in which the reaction occurs.
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Rutherford's scattering experiment demonstrated Question 9 options: the existence of protons. the existence of electrons. the existence of neutrons. that most of the mass of an atom is in its nucleus. that the charge-to-mass ratio of an electron is constant.
He came to the conclusion that mass and positive charge are concentrated at the center of the atom from a small number of alpha particles deflected by huge angles with a 180.
Rutherford discovered that most positively charged alpha particles in his gold foil experiment passed straight through the foil without being deflected, leading him to believe that the majority of the atom's space is largely empty.
He came to the conclusion that mass and positive charge are concentrated at the center of the atom because there are few alpha particles that are deflected by huge angles with a 180. Rutherford Atomic Model - J. J. Thomson's "plum pudding" model was unable to account for some experimental findings related to the atomic structure of elements. British scientist Ernest Rutherford performed.
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at what point in earths orbit is earth farthest from the sun
Answer:
Aphelion
Explanation:
Aphelion is the point of the Earth's orbit that is farthest away from the Sun. Perihelion is the point of the Earth's orbit that is nearest to the Sun.
What are the symbols (in order) for hydrogen, sodium and nitrogen?
Answer:
H, Na, N
Explanation:
Answer:
H, NA, N
Explanation
would deviations from the ideal gas law be observed for gaseous nitrogen at 180 gpa and room temperature? a no, because both temperature and pressure must increase before such deviations are observed b no, because nitrogen molecules are symmetrical and do not interact with each other
Deviations from the ideal gas law be observed for gaseous nitrogen at 180 gpa and room temperatureA. No, because both temperature and pressure must increase before such deviations are observed.
Deviation from the ideal gas law can be observed at high pressure and low temperature, or low pressure and high temperature. Therefore, at 180 GPa and room temperature, deviations from the ideal gas law may be observed for gaseous nitrogen. The deviation is caused by the intermolecular interactions between gas molecules, which become more significant at high pressure. Therefore, option A is incorrect, and option B is also incorrect because it incorrectly suggests that nitrogen molecules do not interact with each other, which is not true.
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why does reactivity increase down group 1 but decrease down group 7?
The reactivity of elements generally increases as you go down a group in the periodic table. This is because elements in the same group have the same number of valence electrons, and as you go down a group, the number of valence electrons increases. This causes the atoms to have a higher positive charge, which makes them more reactive because they are more likely to form chemical bonds with other atoms.
However, the reactivity of elements decreases as you go down group 7 (the halogens) in the periodic table. This is because the valence shell of these elements is already full, so they are less likely to form chemical bonds with other atoms. As a result, the atoms in group 7 are less reactive than those in other groups.
What are the basic elements of selection of proffesion?describe any two
Answer:
overall I think one answer
The kinetic engery of molecules increase as you go from solid liquid gas true or false
A student conducted an experiment to determine how the freezing point of water is affected when sugar is added to the water. He used three beakers, each filled with 1 cup of water. He added 3 teaspoons of sugar in the first beaker of water, 1 teaspoon of sugar in the second, and no sugar in the last beaker. He then cooled each beaker of water and recorded the freezing temperatures. 1. What is the control in this experiment? ___2. What is the independent variable?___ 3. What is the dependent variable?___
Answer:
The control in this experiment is the temperature of the water.
The independent variable is the amount of sugar that is put in.
The dependant variable in this experiment is when the water freezes.
Explanation:
any 2 uses of echo pls fast
Answer:
uuuhm???? sonar??? and???? idk??? gooogle it
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:
When drawing a covalent lewis dot diagram its important to ensure that:
A each atom is surrounded by 6 electrons
B all symbols are in lower case letters
C all the elements have a charge in the top right side
D each atom is surrounded by 8 electrons
chromatography of food dyes lab why is it important to mark the solvent level on the chromatography paper as soon as you remove it from the petri dish
It is important to mark the solvent level on the chromatography paper as soon as you remove it from the petri dish in a chromatography of food dyes lab because if the solvent level is not marked as soon as possible, the solvent front can evaporate causing the results to be inaccurate.
Chromatography is a laboratory technique for separating a mixture into its individual components. The mixture is dissolved in a solvent and then placed in contact with a stationary phase. The components of the mixture are then separated based on their individual interactions with the stationary phase and the solvent. Chromatography of food dyes is a lab that is used to separate different food dyes that are present in a sample.
The sample is placed on chromatography paper which is then placed in a petri dish containing a solvent. As the solvent moves up the chromatography paper, the different dyes in the sample are separated based on their individual interactions with the paper and the solvent.
In a chromatography of food dyes lab, it is important to mark the solvent level on the chromatography paper as soon as it is removed from the petri dish because the solvent front can evaporate causing the results to be inaccurate. If the solvent front evaporates, the distance traveled by the different dyes will be shorter, making it appear as though they are less separated than they actually are.
By marking the solvent level as soon as possible, the distance traveled by the different dyes can be accurately measured, and the results will be more accurate.
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The reason why it is important to mark the solvent level on the chromatography paper as soon as you remove it from the petri dish is that the solvent level must be measured to calculate the Rf value. The Rf value is a way to quantify how far a particular compound travels in chromatography.
It is calculated as the distance traveled by the compound divided by the distance traveled by the solvent.The chromatography of food dyes lab is a experiment that aims to identify the dyes used in food products by using paper chromatography. The procedure includes: Cut a strip of chromatography paper and mark the solvent level using a pencil as soon as you remove it from the petri dish; prepare the chromatography solvent by mixing rubbing alcohol with water; then, spot the dyes on the chromatography paper using toothpicks or capillary tubes.
Afterwards, place the paper in the petri dish containing the solvent, making sure that the dyes do not touch the solvent, and cover it. Allow the solvent to travel up the paper until it reaches the solvent level mark. Once the solvent level has reached the mark, remove the paper from the petri dish and allow it to dry before analyzing the results.
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553.5 mL ?:cm^3
how do i get my answer? and what is the answer?
Answer:
553.5 cm3
Reason:
1 mL = 1 cm3
4. Manik saw his father watering his garden plants in hot weather. He noticed that
water doesn’t stick to the plant leaves and leaves become dry but looked fresh. He asked
following questions to his teacher
a. Which tissue forms the outer covering of a plant and does it have a protective role
to play?How ?
b. Why does water not stick to the leaves?
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
What tissues protects the leaves?We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.
The tissue that plays this outer covering of a plant for is the epidermis and its waxy cuticle. It prevents damage to the plant.
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
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why is it important to know what substances you have available to work with, and how they might change when you developing special effects
Editing and VFX software has advanced to the point where the only limitations are your technical skills and your imagination
Although they are distinct, special effects and visual effects are frequently confused. There are further categories, however special effects are frequently manufactured artificially on set and are known as practical effects (for example, a controlled explosion in an action scene). On the other side, visual effects are produced in the editing room or post-production. While modern visual effects deal with animation, computer generated imagery (CGI), and other post-production effects, early visual effects saw filmmakers experimenting with film stock.
Each has advantages and disadvantages. According to filmmaker Steven Bernstein, special effects are frequently preferable because they allow actors to react to the effects in real time. They also provide lighting effects and other characteristics that would otherwise need expensive computer creation.
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blood test indicates the presence of a particular disease 93% of the time when the disease is actually present. The same test indicates the presence of the disease 0.4% of the time when the disease is not present. Three percent of the population actually has the disease. Calculate the probability that a person has the disease given that the test indicates the presence of the disease. Give your answer in decimal form, rounding to four decimal places.
The probability that a person has the disease given that the test indicates the presence of the disease is approximately 0.9968
To calculate the probability that a person has the disease given that the test indicates the presence of the disease, we can use Bayes' theorem.
Let's denote:
A = Event of having the disease
B = Event of the test indicating the presence of the disease
We are given the following probabilities:
P(A) = 0.03 (3% of the population actually has the disease)
P(B|A) = 0.93 (the test indicates the presence of the disease 93% of the time when the disease is actually present)
P(B|not A) = 0.004 (the test indicates the presence of the disease 0.4% of the time when the disease is not present)
We need to find P(A|B), the probability that a person has the disease given that the test indicates the presence of the disease.
Applying Bayes' theorem:
\(P(A|B) = (P(B|A) * P(A)) / P(B)\)
To calculate P(B), we can use the law of total probability:
\(P(B) = P(B|A) * P(A) + P(B|not A) * P(not A)\)
\(P(not A) = 1 - P(A) = 1 - 0.03 = 0.97\)
Substituting the values into the equation:
\(P(B) = (0.93 * 0.03) + (0.004 * 0.97) ≈ 0.0279\)
Now, calculating P(A|B):
\(P(A|B) = (0.93 * 0.03) / 0.0279 ≈ 0.9968\)
Therefore, the probability that a person has the disease given that the test indicates the presence of the disease is approximately 0.9968 (rounded to four decimal places).
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All flowers have colorful petals and smell wonderful.
True
False
Answer:
false i am pretty sure because dead flowers.