Artificial products, medicines, and fertilizers are examples of chemistry discoveries that have had the greatest impact on the modern world. Polymer discovery has resulted in all the plastics and synthetic fabrics that surround us today.
What is the importance of research in chemistry?Understanding how the properties of substances are related to their molecular structures allows chemists to design new molecules and materials with the desired properties, as well as develop or invent new types of transformations for carrying out the syntheses of these substances.
Chemistry is used in almost every aspect of today's automobiles, from the exterior paint, bumpers, and headlights to the interior seats, dashboard components, and seatbelts and airbags that protect passengers.
To name a few, industrial applications of chemistry have a direct impact on our daily lives: what we eat, what we wear, how we travel, the technology we use, how we treat illnesses, and how we get electricity. Chemistry research is constantly deepening our understanding and leading to new discoveries.
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When the humidity is high, the change of precipitation is (high or low).
Answer:
low, when humidity is low, the chance of precipitation is high.
(so the answer is low :)
Explanation:
_____energy tells us how fast the reaction willproceed.
Explanation
Kinetic energy is a modality of energy present in all moving bodies. According to the SI, its unit of measurement is the joule. Furthermore, this energy is a scalar quantity that has exclusively positive values.
Kinetic energy is proportional to the square of the body's velocity. Thus, if the speed of a body double, its kinetic energy will increase four times, if the speed of a body triple, then this increase will be nine times.
Answer
Kinect energy tells us how fast the reaction will proceed.
a piece of debris travelling through space which ranges in size from a grain of sand to over 100ft in diameter
Answer:
Meteoroids are tiny asteroids or the broken-off crumbs of comets and sometimes planets. They range in size from a grain of sand to boulders 3 feet (1 meter) wide. When meteoroids collide with a planet's atmosphere, they become meteors
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Balance the following equation: __Na+__H₂O ➞ __NaOH+__H₂ *
Answer:
4 4 8 4 is the balanced equation
A molecule is found to contain 47. 35% c, 10. 60% h, and 42. 05% o. What is the empirical formula for this molecule?.
The empirical formula for the molecule containing 47.35% C, 10.60% H, and 42.05% O is CH2O.
To determine the empirical formula, the percentage composition of each element must first be converted to moles. This is done by dividing the mass of each element by its molar mass and multiplying by the total moles in the compound. The total moles in the compound can be determined by dividing the molar mass by the molecular mass. The molecular mass of the compound is calculated by adding the atomic masses of each element together.
Once the moles of each element have been determined, the relative numbers of each element in the compound can be determined by dividing the moles of each element by the total moles in the compound. The empirical formula of the compound is then determined by dividing each element’s relative number by the smallest integer that will yield whole numbers. In this case, the smallest integer for C is 1, for H is 2, and for O is 1, yielding a molecular formula of CH2O.
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Lithium metal reacts with nitrogen gas to form lithium nitride. identify the balanced reaction that describes this process
Lithium metal reacts with nitrogen gas to form lithium nitride the balanced chemical equation will be 6Li + N₂ → 2Li₃N.
What is a balanced chemical reaction?In a balanced chemical reaction, the number of moles that are present at the side of the reactant must be always equal to the side of product formation this is known as a balanced chemical equation.
The balanced chemical reaction will be 6Li + N₂ → 2Li₃N.
Here 6 moles of lithium is reacting with one nitrogen but as it is in gaseous state it is N₂ after reacting with lithium it will give two moles
Therefore, balanced equation will be 6Li + N₂ → 2Li₃N
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What do navigators need to consider when plotting a course?
What is your hypothesis (or hypotheses) for this experiment? (this is for the thermal energy transfer)
Answer:
Hypothesis is a statement of expectation or prediction that will be tested by research
A gas sample is collected in a 0.255 L container at 0.905 atm and 297 K. The sample is found to have a mass of 0.161 g. What is the identity of the gas?A. NO B. CO C.NO2 D.HCl E.CH4
The gas sample collected in a 0.255 L container at 0.905 atm and 297 K, with a mass of 0.161 g, is most likely methane (CH4).
To identify the gas in the given sample, we can use the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature.
Rearranging the above equation, we get:
n = PV/RT
Substituting the given values in the above equation, we get:
n = (0.905 atm)(0.255 L)/(0.0821 L atm/mol K)(297 K) = 0.0119 mol
Now, we can calculate the molar mass of the gas using its mass and number of moles:
Molar mass = mass/number of moles
Molar mass = 0.161 g/0.0119 mol = 13.5 g/mol
Comparing this molar mass with the molar masses of the given gases, we find that the closest match is CH4 (methane), which has a molar mass of 16.0 g/mol. Therefore, the identity of the gas in the sample is most likely CH4.
In conclusion, the gas sample collected in a 0.255 L container at 0.905 atm and 297 K, with a mass of 0.161 g, is most likely methane (CH4).
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a student put a bottle of water and a can of sugared soda in the freezer to chill them quickly . when she took them out , the bottle of water was frozen but the can of soda was not. explain why this happen
Answer:
it's because the liquid in the bottle is supercooled
in the reaction of silver nitrate solution, which is colorless, with copper metal, metallic silver comes out of solution, and the solution turns blue. the blue of the new solution must be due to
The blue color of the new solution in the reaction between silver nitrate and copper metal is due to the formation of copper(II) nitrate. When copper metal reacts with silver nitrate, copper displaces silver from the nitrate compound, resulting in the formation of metallic silver.
This silver precipitate appears as a solid, while the remaining solution contains copper ions and nitrate ions. The blue color is specifically caused by the presence of copper(II) ions in the solution. Copper(II) ions absorb certain wavelengths of light, giving the solution its blue color. It is important to note that the original silver nitrate solution is colorless because it does not contain any metal ions that absorb visible light.
This reaction is commonly used in chemistry demonstrations to showcase the displacement of metals.
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2MG+O2 ...........2MGO
AR=MG=40 , O=16
calculate the mass of maganissium to form log of maganissium oxide
How much of each solution should you add to the vial, if your goal is to have 500 mL of media with a final concentration of 5 mM magnesium sulfate
To achieve a final concentration of 5 mM magnesium sulfate in 500 mL of media, you should add 2.5 mL of 1 M magnesium sulfate solution to the vial.
To calculate the amount of magnesium sulfate solution to add to the vial, you first need to know the concentration of the stock solution that you have on hand. Assuming you have a 1 M (molar) solution of magnesium sulfate, you can use the following formula:
C1V1 = C2V2
where C1 is the initial concentration of the solution (1 M), V1 is the volume of the solution added (unknown), C2 is the desired final concentration (5 mM or 0.005 M), and V2 is the final volume (500 mL or 0.5 L).
Rearranging the formula to solve for V1, we get:
V1 = (C2V2) / C1
Plugging in the values, we get:
V1 = (0.005 M x 0.5 L) / 1 M
V1 = 0.0025 L or 2.5 mL
Therefore, to achieve a final concentration of 5 mM magnesium sulfate in 500 mL of media, you should add 2.5 mL of 1 M magnesium sulfate solution to the vial.
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Thermodynamics
Can we consider the following to be ideal gases? (a) N2 at
50oC, 5bar,
(b) CO2 at 50oC, 5bar, (c) Water at 1200oC,
5bar, (d) Water at
100oC, 1bar.
The following are the explanations for each substance.
(a) N2 at 50°C, 5 bar: The given substance can be considered as an ideal gas since it is at a low pressure (5 bar). The ideal gas equation PV = nRT can be used to determine the properties of the given gas.
(b) CO2 at 50°C, 5 bar: The given substance can be considered as a real gas since it is at a moderate pressure. We cannot use the ideal gas equation to determine the properties of the given gas since it does not obey the ideal gas law at such a moderate pressure.
(c) Water at 1200°C, 5 bar: The given substance cannot be considered as an ideal gas since it is at a high temperature and a moderate pressure. Water at such conditions cannot be approximated as an ideal gas and hence we cannot use the ideal gas equation to determine its properties.
(d) Water at 100°C, 1 bar: The given substance can be considered as an ideal gas since it is at a low pressure (1 bar). The ideal gas equation PV = nRT can be used to determine the properties of the given gas.
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Is it coating iron pipe with Zinc or connecting a zinc rod to a
iron pipe, which is advantageous to protect the Fe surface from
undergoing corrosion? Justify the answer
Connecting a zinc rod to an iron pipe offers advantages in protecting the iron surface from corrosion. The zinc acts as a sacrificial anode, corroding in place of the iron and providing uniform and extended protection to the entire iron pipe.
Connecting a zinc rod to an iron pipe is advantageous to protect the iron (Fe) surface from undergoing corrosion. This process is known as cathodic protection, where the zinc acts as a sacrificial anode. Here's the justification for this answer:
Galvanic Protection: When a zinc rod is connected to an iron pipe, it creates a galvanic cell. Zinc is more reactive than iron, so it acts as the anode, sacrificing itself to protect the iron pipe (cathode). The zinc corrodes instead of the iron, thereby providing protection to the iron surface.Sacrificial Anode: Zinc has a higher electrochemical potential than iron, making it more susceptible to corrosion. This means that zinc will preferentially corrode instead of the iron pipe. By connecting a zinc rod, the zinc sacrificially corrodes, protecting the iron from corrosion. Uniform Protection: Connecting a zinc rod provides uniform protection to the entire iron pipe surface. As long as the zinc rod is in contact with the iron pipe, it will continuously provide cathodic protection along the entire length of the pipe. Extended Protection: The sacrificial zinc anode can provide protection for an extended period before it gets fully consumed. Once the zinc is depleted, it can be replaced with a new zinc rod to continue the protection.Read more on corrosion here: https://brainly.com/question/489228
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How many FeCl2 formula units are there in 10. 4 g of FeCl2? Molar mass of FeCl2 is 126. 75 g/mol
To determine the number of \(FeCl_2\) formula units in 10.4 g of \(FeCl_2\), we divide the given mass by the molar mass of \(FeCl_2\) and multiply by Avogadro's number.
To calculate the number of formula units (or molecules) in a given mass of \(FeCl_2\), we need to convert the mass to moles and then use Avogadro's number to determine the number of formula units.
First, we calculate the number of moles of \(FeCl_2\)in 10.4 g using the molar mass of \(FeCl_2\), which is 126.75 g/mol:
\(\[\text{{Moles}} = \frac{{\text{{Mass}}}}{{\text{{Molar mass}}}} = \frac{{10.4 \, \text{g}}}{{126.75 \, \text{g/mol}}} = 0.082 \, \text{mol}\]\)
Next, we use Avogadro's number, which is approximately \(\(6.022 \times 10^{23}\)\) formula units per mole, to find the number of formula units:
\(\[\text{{Number of formula units}} = \text{{Moles}} \times \text{{Avogadro's number}} = 0.082 \, \text{mol} \times 6.022 \times 10^{23} \, \text{mol}^{-1} = 4.95 \times 10^{22} \, \text{formula units}\]\)
Therefore, in 10.4 g of \(FeCl_2\), there are approximately \(4.95 \times 10^{22}\) formula units of \(FeCl_2\).
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Which cell lacks a nucleus
Answer:life
Explanation:
because we act like we have no cells
Is a gummy worm increased by two inches a qualitative or quantitative
Answer:
quantitative
Explanation:
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How many molecules are there in 45.0 grams of CH4?
Answer:\(16.93\times 10^{23}\ \text{molecules}\)
Explanation:
Given
Mass of \(CH_4\) \(m=45\ gm\)
Molar mass of \(CH_4\) is \(12+4\times1=16\)
No of moles of \(CH_4\) \(=\dfrac{\text{Mass}}{\text{Molar mass}}=\frac{45}{16}\)
No of Molecules in 45gm of \(CH_4\) is
\(\Rightarrow N_A\times\frac{45}{16}=6.022\times 10^{23}\times \frac{45}{16}\\\Rightarrow 16.93\times10^{23}\ \text{molecules}\)
Describe what happens to the particles when a substance:
1. Melts
2. Freezes
3. Boils
4. Condenses
Which of the following contains plasma?
steam
dry ice
gas
lightning
what are the function and structure of a bacteria
Answer:
the cell wall forms a rigid structure of uniform thickness around the cell and is responsible for the characteristic shape of the cell (rod, coccus, or spiral).
effect of using synthetic fuels on co2 emissions: a compact passenger car that runs on natural gas emits 0.218 kg co2 per mile driven
The output of CO2 and other pollutants discharged into the environment can be greatly decreased by the use of synthetic gas and biofuel. Synthetic fuel for commercial flights and fuel for automobiles are still a long way off, though.
Does coal produce more CO2 than natural gas?When burned in a modern, efficient natural gas power station, natural gas emits 50 to 60 percent less carbon dioxide (CO2) than emissions from a typical new coal plant.
How does the environment get affected by burning natural gas?When burning natural gas for energy, less carbon dioxide (CO2) and almost all other air pollutants are released into the atmosphere compared to when burning coal or petroleum products for the same amount of energy.
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What large city in Texas will have its third day of rain?
Answer:
houston, texas
Explanation:
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Magnesium lon has less electrons than its atom
True
False
A sample of argon gas collected at a pressure of 0.918 atm and a temperature of 279 K is found to occupy a volume of 719 milliliters. How many moles of Ar gas is in the sample?
mol
VERY URGENT - 100 POINTS
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant
1. Make a Claim Your claim should be a response to the question stated above.
2.Cite Evidence Outline the steps of a scientific investigation that could provide evidence in support of your claim.
3. Use Reasoning Justify how the data and knowledge count as evidence toward supporting the claim.
The claim is given as follows: As is consistent with the Law of Conservation of Mass, Heating 10g of Calcium Carbonate (CaCO₃) translates to 4.4g of carbon dioxide and 5.6g of calcium oxide (CaO).
The evidence is supported by the rule of conservation of mass.
What is the evidence of the above and the steps of a scientific investigation that could provide evidence in support of the above claim?It is to be noted that:
Mass of the reagent = Mass of the products 10 grams of CaCO₃
= 4.4grams CO₂ + 5.6 of CaONote that 4.4 + 5.6
= 10 hence,10 grams of reactants
= 10grams of products.
Using deductive reasoning, we can state therefore that the observations are consistent with the rule of conservation of mass since the mass of the reagent is equal to the mass of the products.
Thus, it is right to conclude that:
Matter is not destroyed by burning or other modifications in the matter.
The mass of matter remains constant before and after the alterations.
According to the rule of conservation of mass, matter cannot be made from scratch or destroyed.
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What is the volume (in cm^3) of a 25.2 g piece of metal with a density of 8.75 g/cm3?
The volume of a 25.2 g piece of metal with a density of 8.75 g/cm³ is approximately 2.88 cm³. Density is a measure of how much mass is contained in a given volume.
The formula for density is density = mass/volume. In this case, the mass is given as 25.2 g, and the density is 8.75 g/cm³. To find the volume, we rearrange the formula as volume = mass/density.
Substituting the known values, we get volume = 25.2 g / 8.75 g/cm³. The units of grams in the numerator and denominator cancel out, leaving us with cm³ as the unit for volume. Calculating the division, we find that the volume of the metal is approximately 2.88 cm³.
This means that 25.2 grams of this metal would occupy a volume of 2.88 cubic centimeters.
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Drag each tile to the correct location.
What types of mixtures are these? Homogeneous or Heterogeneous
- peanuts and almonds mixed
together in a bowl
- a bucket full of sand and gravel
- a cup of tea and sugar
- food coloring dissolved in water
Answer:
below
Explanation:
- peanuts and almonds mixed
together in a bowl heterogeneous
- a bucket full of sand and gravel
heterogeneous
- a cup of tea and sugar homogeneous
- food coloring dissolved in water homogeneous
Which of the following has the highest electromagnivity
Answer:
Where are the answer choices
?