Three examples of environmental, industrial and bio-chemistry are listed below:
Environmental chemistry: Contamination, Atmospheric Deposition, and Soil Pollution.industrial chemistry: industrial inorganic chemicals, industrial organic chemicals, and agricultural chemicalsbio-chemistry: genetic, immunology, and enzymologyMeaning of ChemistryChemistry can be defined as a branch of science which is concerned with the substances matter is composed of, their properties and reactions,
Chemistry also deals with the use of such reactions to form new substances.
In conclusion, Three examples of environmental, industrial and bio-chemistry are listed anove
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A sample of X is carefully weighed and put inside a sealed calorimeter. The calorimeter is heated electrically, and the amount of heat added determined by monitoring the electrical current used. The temperature of X is carefully measured, and from the temperature change and the amount of heat added the value of H
may be calculated.
Is this a physical or chemical property?
The value of the heat of combustion (H) that is calculated here is a chemical property.
What is the heat of combustion?The heat of combustion is the energy that is given up when a substance is burnt in a calorimeter. The heat of combustion is often measured by the use of a calorimeter.
Hence, the value of the heat of combustion (H) that is calculated here is a chemical property.
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For a typical person who leads a sedentary lifestyle, a typical maximum oxygen intake level would be __________. A. 20 ml/kg/min B. 35 ml/kg/min C. 50 ml/kg/min D. 70 ml/kg/min Please select the best answer from the choices provided. A B C D
For a typical person who leads a sedentary lifestyle, a typical maximum oxygen intake level would be B. 35 ml/kg/min.
A sedentary lifestyle is a lifestyle type characterized by abundant sedentary behaviors. People who live a sedentary life often sit or lie down for most of the day in activities such as socializing, watching TV, playing video games, reading books, and using mobile phones and computers.
A sedentary lifestyle can lead to high blood pressure, low cholesterol, and elevated blood sugar levels, which damage the walls of blood vessels and increase the risk of a heart attack.
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A/n ____ replacement is when a metal replaces a metal in a single replacement chemical reaction.
Select one:
a.
acid
b.
anion
c.
cation
d.
base
anion
the reaction is called single displacement whereby an element is substituted by another in a compound
A cation replacement is when a metal replaces a metal in a single replacement chemical reaction.
What is chemical reaction?
Chemical reactions are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
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Based on the information in the table, which of the following arranges the bonds in order of decreasing polarity?
Polarity is the chemical property based on the electric charge and orientation of the poles. Al−O>H−Br>As−S is arranged in decreasing order of polarity. Thus, option d is correct.
What is polarity?Polarity is a chemical property of the distribution of the electrical charges over their respective atom in the molecule joined by the bonds. The relation between the polarity and the difference in electronegativity is directly proportional.
The electronegativity difference between the elements are:
Al−O = 1.8H−Br = 0.8As−S = 0.4As the electronegativity difference between Al−O = 1.8 is the highest it will have the highest polarity followed by H−Br = 0.8, and As−S = 0.4, with the lowest polarity.
Therefore, option D. Al−O>H−Br>As−S is arranged in decreasing order of polarity.
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State law of conservation of mass and prove the law for below given chemical reaction
The law of conservation of mass say that, in a chemical reaction, the mass of the reagents will always be equal to the mass of the products. This is shown in the reaction given below.
Mass of the reagent: 100 g.Mass of the products: 56 + 44 = 100 g.Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Explanation:
During a chemical reaction, atoms are neither created nor destroyed. The atoms of the reactants are just rearranged to form products. Hence, there is no change in m
If a calculation calls for you to convert from an amount of one substance in a given chemical reaction to the corresponding amount of another substance participating in the same reaction, it is an
The question is incomplete. Please read below to find the missing content.
By way of searching the coefficients, you may see that for each 1 mole of C6H12O6, 2 moles of CO2 are produced. Using this ratio, you can figure out what number of moles of carbon dioxide are crafted from five moles of glucose.
Stoichiometry permits us to make predictions about the outcomes of chemical reactions. Making beneficial predictions is one of the important dreams of science, the other being the ability to provide an explanation for phenomena we have a look at inside the natural world.
Stoichiometry can be tough as it builds upon a number of character capabilities. To be successful you need to grasp the abilities and learn how to devise your hassle-solving method. Master every one of those skills earlier than moving on, Calculating Molar Mass.
If a calculation calls for you to convert from an amount of one substance in a given chemical reaction to the corresponding amount of another substance participating in the same reaction, it is an equation Stoichiometry problem.
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Before attaching the rubber hosing to the side-arm Erlenmeyer flask it should be ___ to a universal stand to prevent tipping.
Precautions to observe when hosing rubber:
Before attaching the rubber hosing to the side-arm Erlenmeyer flask it should be "higher than one centimeter" to a universal stand to prevent tipping.
Erlenmeyer flask:
These are used to quickly filter liquids in a variety of general laboratory tasks. Conical flasks with flat bottoms, tapered necks, and sidearms for vacuum filtration are typical flask designs.Ideal for distillation, fractionation, reflux, and extraction.most frequently made from borosilicate glass, which has robust walls and pressure resistance in vacuum.The flasks are frequently used in association with other items, such as a Buchner funnel or ring that is fitted through a rubber bung. The sidearm, which has barb-like rings on the tip to enable attachment to vacuum tubing, can be either fixed to the flask or removable. The production of the flasks can be done using alternative materials, like polystyrene, depending on the use. There are numerous capacities and socket sizes for filtering flasks.Learn more about the Erlenmeyer flask here,
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When water evaporates, the energy that was used to evaporate the water is stored as ____________________ in the evaporated water.
Answer:
The energy that was used to evaporat the water is stored as sensible heat in the evaporated water
When water vapor condenses during the formation of clouds, energy releases into the atmosphere through latent heating.
The percent yield of alum is calculated based on the starting quantity of aluminum. Why can't the quantity of sulfuric acid be used to calculate the percent yield
The quantity of sulfuric acid may not be used because sulfuric acid is excessive and aluminum is limiting.
Limiting reactantsLimiting reactants in reactions are reactants that are present in lower stoichiometric quantities in comparison with other reactants.
Thus, limited reactants determine how far the reaction can go in terms of producing products.
Thus, the percent yield of alum might have been calculated based on the starting quantity of aluminum because the latter is the limiting reactant of the reaction.
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7. Explain how magnetic potential energy can be transformed into kinetic energy. (1
point)
Considers both states of matter and describes the spacing and movement / forces between the particles. Explains a property of both solids and gases.
The particles in solids are not free to move because of strong attractive forces while gases are in constant random motion.
What is the nature of solids and gases?Solids are composed of particles which are arranged in a definite pattern.
The forces of attraction between the particles are strong and the particles are not free to move.
Solids have definite volume and shapes.
Gases are composed of particles which are in constant random motion and whose forces of attraction between the particles are weak.
Therefore, the particles in solids are not free to move because of strong attractive forces while gases are in constant random motion.
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Phosphoric acid (H3PO4) is a triprotic acid because each of its three hydrogen atoms may dissociate in water. What mathematical relationship exists among the acid-dissociation constants (Ka1, Ka2, and Ka3) for phosphoric acid?
The formula that connects Ka1, Ka2, and Ka3 is the relation;
Ka = Ka1 * Ka2 * Ka3
What is the Ka?The Ka is defined as the acid dissociation constant of a solution. Now we have the triprotic acid called phosphoric acid. this implies that we have Ka1, Ka2, and Ka3.
Thus the formula that connects Ka1, Ka2, and Ka3 is the relation;
Ka = Ka1 * Ka2 * Ka3
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An aqueous solution contains 0.21 M ammonium iodide. One Liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as each substance is added.)
The ammonium iodide solution is converted into a buffer by the addition of ammonia (NH₃).
What is a buffer solution?A solution which is formed by the addition of weak acid and its conjugate base or weak base and its conjugate acid. They resist a change in pH of the solution when an acid or alkali added to them.Which is to be added to the given solution to convert it into a buffer?The given solution contains 0.21 M ammonium iodide (NH₄I). This is a salt of a weak base(NH₃) and a strong acid(HI).
NH₄I(s) → NH₃(g) + HI(g)
Where the salt is ionic. So, in aqueous solution it dissociates into NH₄⁺ and I⁻
The ammonium ion NH₄⁺ is the conjugate acid of the weak base NH₃.
So, the mixture of this weak base NH₃ and its conjugate acid NH₄⁺ converts the solution into a buffer.
Therefore, one liter of the given solution could be converted into a buffer by the addition of a weak base NH₃.
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Explain how the information given below could be used to determine the concentration of an unknown sample.
Concentration (M)
0.20
0.3
0.40
0.50
Absorbances
0.27
0.41
0.55
0.69
Answer:
See below
Explanation:Plot the known concentrations and adsorbance data. Draw a best fit line through thwe points. When the absorbance of a solution of unknown concentration (but same substance) is determined, find the concentration from the line at that absorption value. See attached graph.
E.g., an sample of the same substance had an absorbance of 0.35. Find that on the x scale and then determine the concentration that would be required to produce that level of absorbance. 0.483M in this case.
In the laboratory, a student dilutes 13.5 mL of a 11.6 M hydroiodic acid solution to a total volume of 100.0 mL. What is the concentration of the diluted solution
Answer: The concentration of the diluted solution is 1.566M.
Explanation:
The dilution equation is presented as this: [tex]M_{s} V_{s} =M_{d} V_{d}[/tex].
·M= molarity (labeled as M)
·V= volume (labeled as L)
·s= stock solution (what you started with)
·d= diluted solution (what you have after)
Now that we know what each part of the formula symbolizes, we can plug in our data.
[tex]11.6M*13.5mL=M_{d} *100mL[/tex]
We cannot leave it like this because the volumes must be in Liters, not milliliters. To convert this, we divide the milliliters by 1000.
[tex]13.5mL/1000=0.0135L[/tex] [tex]100mL/1000=0.1L[/tex]
Now that we have the conversions, let's plug them into the equation.
[tex]11.6M*0.0135L=M_{d} *0.1L[/tex]
The only thing that we need to do now is actually solving the answer.
[tex]M_{d} =\frac{11.6M*0.0135L}{0.1L}[/tex] [tex]M_{d} =1.566M[/tex]
From the work shown above, the answer is 1.566M.
I hope this helps!! Pls mark brainliest :)
Can someone help me with this??
Answer:
Explanation:
There are many observations, but the three that stand out for me are:
Leafs/plants are the original photocell. Phtocell generally refers to the conversion of sunlight energy into electrical energy. photosynthesis converts sunlight into chemical energy that uis stored in molecules such as carbohydrates.Plants make the oxygen that most life needs to survive. Photosynthesis removes carbon dioxide from the air. As a grennhouse gas, CO2 needs to be in balance with the rest of the planet. More plants are needed to removed CO2 released by buring of fossil fuels. Water is a feedstock in photosynthesis, so drought is a major threat.Calculate the uncertainty in the velocity of a wagon of mass 4000kg whose position is known accurately of ±10m. class 11 Chemistry Structure of Atom chapter. I'll mark brainliest
Answer:
1.3×10−39ms−1
Explanation:
The radioactive decay of a sample containing an unknown radioactive isotope produced 6608 disintegrations per minute. 7.29 days later, the rate of decay was found to be 2932 disintegrations per minute. Calculate the half-life in days for the unknown radioactive isotope.
The half life is 0.47906yr
The uncertainty principle governs radioactive decay, making it impossible to predict with precision when a given nucleus will split apart and release a particle.
However, we can estimate the likelihood that a nucleus will dissolve in a specific amount of time.
We can foretell what portion of a huge number of nuclei will dissolve during that time.
Regardless of the isotope's quantity, this fraction will fluctuate based on each isotope's stability.
Alternatively, we can consider the issue in terms of how long it will take a specific fraction of an isotope to dissociate.
We have r0 = 6608 min–1 g–1, while r = 2932 min–1 g–1, and t = 7.29 days. Substituting into
we then have
ln r/r0 = −0.693*t / t1/2
ln (2932/6603) = -0.693 * 7.29 / t1/2
ln (0.44404) = -0.693*7.29/t1/2
t1/2 = (-0.693/-0.8118) * 7.29days
t1/2= 0.8536*7.29days
1yr = 28.1yrs
0.0199yr (7.29days) = 0.56123yr
t1/2 = 0.8536*0.56123
Half Life = 0.47906yr.
Hence the half life is 0.47906yr
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A 21.5 g sample of nickel was treated with excess silver nitrate solution to produce silver metal and nickel(II) nitrate. The reaction was stopped before all the nickel reacted, and 36.5 g of solid metal (nickel and silver) is present. Calculate the mass of solid silver metal present in grams.
The mass of nickel is 36.5g metal.
Ni+2AgNO3 → Ni(NO3)2+2Ag
21.5g Ni / 58.69g = 0.366mol Ni
Ag = 107.87
N i= 58.69
But, 2molAg per 1 mol Ni, so, change in mass is more like...
Twice as many moles Ag as Ni, and then the mass relationship is 107.87g Ag / 58.69, but due to the 2Ag: 1Ni mol ratio, the change in mass is like:
107.87(2) / 58.69 = 3.68 times increase
So, the final mass of Ag is 3.68x, and the change in mass of Ni is x
36.5=(21.5-x)+(3.68x)
Solve for x
x=5.597
3.68x=g Ag
3.68(5.597)=20.59
21.5 - x = g Ni after reaction
21.5 - 5.597 = 15.903g Ni
20.59g Ag + 15.903g Ni = 36.5g metal
The mass of nickel is 36.5g metal.
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A sealed container holds ideal oxygen molecules (O2) at a temperature of 255 K. If the pressure is increased by 44.0%, what is the average translational kinetic energy of an oxygen molecule
The average kinetic energy of an oxygen molecule is K.E(avg) = 6.11×10^(-21) J.
According to the kinetic theory of gases, the average kinetic energy of a gas molecule is linearly proportional to the temperature of the gas. It is independent of the pressure of the gas.
The kinetic theory of gases is an easy, historically great classical version of the thermodynamic conduct of gases, with which many essential standards of thermodynamics had been established.
The model, referred to as the kinetic concept of gases, assumes that the molecules are very small relative to the gap among molecules. The molecules are in constant, random motion and frequently collide with every different and with the walls of any field.
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How many protons, neutrons, and
electrons are in an atom of bervllium with
a mass number of
9? Use a periodic table.
a.4 protons, 4 electrons, 5 neutrons
b. 4 protons, 4 electrons, 4 neutrons
c. 5 protons, 5 electrons, 4 neutrons
d. 4 protons, 4 electrons, 9 neutrons
Your answer is 4 protons 4 electrons and 5 neutrons
How many grams of silver chromate will precipitate when 150. mL of 0.500 M silver nitrate are added to 100. mL of 0.400 M potassium chromate
The amount of silver chromate that precipitates after addition of solutions is 12.44 g.
Number of moles:
The number of moles is the product of molarity of the solution and its volume. The formula is expressed as:
Moles = Molarity x Volume
Calculations:
Step 1:
The molecular formula of silver nitrate is AgNO3. The number of moles of silver nitrate is calculated as:
Moles of AgNO3 = 0.500 M x (150/1000) L
= 0.075 mol
Step 2:
The molecular formula potassium chromate is K2CrO4. The number of moles of potassium chromate is calculated as:
Moles of K2CrO4 = 0.400 M x (100/1000) L
= 0.04 mol
Step 3:
The balanced chemical reaction between AgNO3 and K2CrO4 is:
2AgNO3 + K2CrO4 -----> Ag2CrO4 + 2KNO3
The required number of moles of K2CrO4 = 0.075 mol/2 = 0.0375 mol
The given number of moles of K2CrO4 (0.04 mol) is more than the required number of moles (0.0375 mol). Therefore, AgNO3 is the limiting reagent.
Step 4:
According to the reaction, the molar ratio between AgNO3 and Ag2CrO4 is 2:1. Hence, the number of moles of Ag2CrO4 formed is 0.0375 mol.
The molar mass of Ag2CrO4 is 331.74 g/mol.
The mass of Ag2CrO4 is calculated as:
Mass = 0.0375 mol x 331.74 g/mol
= 12.44 g
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Classify each aqueous solution as acidic, basic, or neutral at 25 °C.
pH = 3.69
[OH-] = 3.7 x 10-10
pH = 9.04
[H+] = 6.1 x 103
[H] = 8.0 x 10-10
[OH-] = 7.1 x 10²
pH = 7.00
[H+] = 1.0 x 10-7
vanillin is a flavoring agent in vanilla it has a mass percent composition of 61.15% c,5.3%H,31.55% o determine the empirical formula and molecular formula if molecular mass of vanillin is 152.15%g/mol
The empirical and molecular formulas will be [tex]C_5H_5O_2[/tex] and [tex]C_1_0H_1_0O_4[/tex] respectively.
Empirical and molecular formulaThe compound contains C, H, and O.
C = 61.15/12 = 5.0958
H = 5.3/1 = 5.3
O = 31.55/16 = 1.9719
Divide by the smallest
C = 2.6
H = 2.7
O = 1
Thus, the empirical formula is [tex]C_5H_5O_2[/tex]
Empirical formula mass = (12x5) + (1x5) + 16x2 = 97
n = 152.15/97 = 2
The molecular formula is [tex]C_1_0H_1_0O_4[/tex]
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Calculate the number of moles in 8 g of water.
0.11 mole
O 0.44 mole
Q0.33 mole
0.22 mole
Answer:
refer the above attachment
Decide whether the property measured was a chemical or physical property of X, if you can. If you don’t have enough information to decide, choose can’t decide in the third column
Answer:
See attachment for explanations.
Explanation:
Predict the products of the reaction below. That is, complete the right hand side of the chemical equation. Be sure your equation is balanced.
Answer:
2 HClO₃ + Ca(OH)₂ ---> Ca(ClO₃)₂ + 2 H₂O
Explanation:
This is a double-displacement reaction. In these reactions, the cation of one molecule swaps with the cation of another.
In this case, the hydrogen cation (H⁺) from HClO₃ swaps with the calcium cation (Ca²⁺) of Ca(OH)₂. When writing the products, keep the charges of the ions in mind. The products must be neutral, so some will need to have more than 1 cation/anion.
The unbalanced equation:
HClO₃ + Ca(OH)₂ ---> Ca(ClO₃)₂ + H₂O
Reactants: 3 hydrogen, 1 chlorine, 5 oxygen, 1 calcium
Products: 2 hydrogen, 2 chlorine, 7 oxygen, 1 calcium
The balanced equation:
2 HClO₃ + Ca(OH)₂ ---> Ca(ClO₃)₂ + 2 H₂O
Reactants: 4 hydrogen, 2 chlorine, 8 oxygen, 1 calcium
Products: 4 hydrogen, 2 chlorine, 8 oxygen, 1 calcium
What would be the mass in grams of 0.300 moles of the ionic compound formed when magnesium metal reacts with oxygen
Answer:
Balanced Equation for reaction between Magnesium and Oxygen:
2Mg + O₂ --> 2MgO
Molar Mass of MgO is the atomic masses listed on the periodic table for the two elements Magnesium and Oxygen. Magnesium's molar mass is 24g/mol, and Oxygen's molar mass is 16g/mol. So MgO's molar mass would be 24 + 16 = 40g/mol.
The equation to find moles is:
[tex]moles \ = \ \frac{mass}{molar \ mass}[/tex]
So if we rearrange this equation to find for mass:
[tex]mass = moles \ * \ molar \ mass[/tex]
So you have to multiply 0.300 moles by 40, which gives you 12g
Meaning the mass of Magnesium Oxide is 12g.
How is Earth different from other planets?
OA. It has liquid water.
OB. It has mountains.
OC. It has a moon.
OD. It gets light from the Sun
Why are the two equilibrium reactions below not affected by an increase in pressure?
An increase in pressure does not affect the reaction because the moles of reactants and products or the pressure of the forward reaction are equal at equilibrium.
What is chemical equilibrium?A chemical reaction is in equilibrium if the rate of the backward reaction and the forward reaction are equal.
Pressure affects the equilibrium position of chemical reactions involving gases.
For the given reactions in equilibrium, moles of reactants and products and hence, the pressure of the forward reaction are equal at equilibrium, therefore, an increase in pressure does not affect it.
Therefore, an increase in pressure will only affect the equilibrium of a reaction in which the pressure varies in the forward and backward reaction.
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