Answer:
Climate change and an increase in unpredictable and extreme weather is a growing challenge. Long periods of drought affect clean water supplies while flooding can pollute clean water sources and cause outbreaks of disease.
Answer:
could be areas they live in
What are the basic units of matter?
electrons
atoms
protons
neutrons
How many grams and moles contain:
a. 3.011 × 10^24 atoms CO².
b. 9.033 × 10^22 molecules N².
Answer:
A.3.011 x 10^24 atoms CO²
[tex] \overline{ \quad \quad \quad \quad\quad\quad\quad\quad\quad}[/tex]
hope it helps!
Difference between dipole dipole and hydrogen bonding
Hydrogen bonds are stronger than the dipole dipole attraction force present in any molecule.
What is bonding in molecules?Bonding is a type of attraction force which is present between the different atoms or elements of any substance.
Dipole dipole attraction force is a weak force as compared to the hydrogen bonding and present between any two oppositely charged atoms.Hydrogen bond is present between the hydrogen atom and more electronegative atoms like O, S, N and F.Hence main difference is that hydrogen bond is only present between the hydrogen atom and more electronegative.
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A new penny has a mass of 2.49 g and a volume of 0.349 cm3. is the penny made of pure copper?
Looking at the density of the penny which is 7.1347 g/cm³, it can be concluded that it is not made from copper.
What is density?It is the ratio of the mass of a substance to its volume.
Mathematically; density = mass/volume
In this case, the mass of the coin is 2.49 g, and the volume is 0.349 cm³. Thus:
Density of coin = 2.49/0.349 = 7.1347 g/cm³
The density of copper is 8.96 g/cm³ at room temperature.
Hence, the penny is not made of copper.
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COCI2 has an effusion rate of 0.00172 m/sec. Which of the gases below would have an effusion rate of 0.00323 m/sec?
a) CH4
b) CO
c) Ne
d) H2S
Show work.
Is alka seltzer and acid or a base or netural
Answer:
Base
Explanation:
Why is Alka-Seltzer a base?
Alka-Seltzer contains sodium bicarbonate and citric acid. The sodium citrate acts as an antacid. Excess sodium bicarbonate from the Alka-Seltzer acts to neutralize base.
Grams of potassium chloride per 100 g of water (experimental) in the original solution. Show calculation
The mass of potassium chloride with solubility 253.9 g/mL present in 100 grams of solution is 25.4 grams.
What is concentration?Concentration is given as the quantity of the solute present in the solution. The water at 25 degrees Celsius has density of 0.9982 g/mL.
The mass of the 100 grams of water is given as:
[tex]\rm Density=\dfrac{mass}{volume}\\\\0.9982\;g/mol=\dfrac{100\;grams}{Volume}\\\\Volume=100.180\;mL[/tex]
The solubility of potassium chloride is 253.9 g/mL
The grams of potassium chloride in the 100 grams solution will be:
[tex]\rm Mass\;of\;potassium\;chloride=\dfrac{253.9}{1000}\;\times\;100.81\;g\\\\Mass\;of\;potassium\;chloride=\25.4\;g[/tex]
Thus, the mass of potassium chloride present in 100 grams of water is 25.4 grams.
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Which metals will dissolve in nitric acid but not hydrochloric
The metal that can react and dissolve in nitric oxide but not in HCl is copper.
What is reactivity series?The reactivity series is given as the arrangement of the metals in the descending order of their reactivity.
The HCl is able to dissolve the metals that have reactivity less than the hydrogen. Nitric oxide is a strong oxidizing agent and has the ability to react with metals such as copper and oxidizes it.
The HCl is however unable to react with copper as it has high reactivity than hydrogen. Thus, copper can dissolve in nitric oxide, but not in HCl.
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Rules for naming ionic compounds wiht transition metal
Rules for naming ionic compounds with transition metal requires the elementary name of metal followed the anion name with suffix ide.
What are ionic compounds?Ionic compounds are made up of ions, which are charged particles that occur when an atom (or group of atoms) acquires or loses electrons. Generally cations are metals and anions are non metals in it.
Following rules will be considered during naming:
First determine the metal's elemental name.Give the nonmetal its elemental name and the suffix -ide.Use roman numerals to denote positive charge when naming metals that can have distinct oxidation states.Name the polyatomic ions according to their names.Hence rules for naming are listed above.
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Plutonium-32 has a half-life of 14. 2 days. After 99. 4 days, how much of what was originally a 499. 2 gram sample remains?
The amount of sample of Plutonium-32 which is remained after 99.4 days is 3.9 grams.
How do we calculate the remaining amount?Remaining amount of any substance after the decay will be calculated by using the below equation:
N = N₀[tex](\frac{1}{2})^{\frac{T}{t}}[/tex], where
N = remained quantity = ?
N₀ = original quantity = 499.2g
T = total time = 99.4 days
t = half life time = 14.2 days
T/t = 99.4/14.2 = 7
On putting all these values in the above equation, we get
N = (499.2)(0.5)⁷
N = (499.2)(0.0078) = 3.9g
Hence remaining mass of Plutonium-32 is 3.9 g.
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Write a balanced equation for the combustion of 1 mol of c4h10o(l)
The combustion of diethyl ether gives releases of carbon dioxide gas along with the water.
What is combustion?Combustion is given as the reaction of the burning of the compound in the presence of oxygen.
The combustion results in the breakdown of the compound to its constituent ions or atoms. The reaction of combustion of [tex]\rm C_4H_1_0_O[/tex] is:
[tex]\rm C_4H_1_0_O\;(l)\;+\;6\;O_2\;(g)\;\rightarrow\;4\;CO_2\;(g)\;+\;5\;H_2O\;(l)[/tex]
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Location E is located at the Tropic of Cancer, while location F is at the equator. Which location is likely to be warmer at the start of the summer in June? Location E, because Earth is receiving equal sunlight throughout Location F, because Earth is receiving equal sunlight throughout Location E, because Earth's axis is tilted towards the sun Location F, because Earth's axis is tilted away from the sun
The answer is "Location E, because Earth's axis is tilted towards the sun" :D
Answer:
C. Location E, because earth's axis is tilted towards the sun
Explanation:
Why are atoms considered the building blocks life?
Given the gas laws what has to increase to increase temperature
Given the gas laws, the volume has to increase, with the increase in temperature.
What are gas laws?There are three basis gas laws which relates the pressure, temperature, and volume of the gas.
Boyle's law—states that with the decrease in the pressure of the gas, the volume increases.Charles' law - states that volume of gas increase with increase in the temperature of the gas. Avogadro's Law - states that the volume of gas increases as the amount of gas increases.The ideal gas law is the combination of the three simple gas laws.
Thus, the volume has to increase, with the increase in temperature.
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What is the critical angle for the interface between water and diamond?
The critical angle for the interface between water and diamond is 33.4 degrees.
What is the critical angle?The greatest angle at which a ray of light traveling through one transparent medium can hit the border between that medium and a second of lower refractive index.
It strikes the border without being completely reflected within the first medium is called the critical angle in optics.
Thus, the critical angle for the interface between water and diamond is 33.4 degrees.
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How many grams of potassium chloride (KCI) are needed to prepare 0.750 L of a 1.50 M solution of potassium chloride in water?
Which quantity is equivalent to the product of the absolute index of refraction of water and the speed of light in water?
The quantity which is equivalent to the product of the absolute index of refraction of water and the speed of light in water system is the speed of light in vacuum.
What is the speed of light?Speed of light is the rate of speed though the light travels. To find the speed of light in any medium, the following formula is used.
[tex]v=\dfrac{c}{n}[/tex]
Here, (n) is the index of reaction and (c) is the speed of light in the vacuum. The speed of light in the vacuum is almost equal to the 3.0×10⁸ m/s.
Now the quantity which is equivalent to the product of the absolute index of refraction of water and the speed of light in water has to be find out.
The above formula can be written as,
[tex]v=\dfrac{c}{n}\\vn=c\\c=vn[/tex]
Here, the product of index of refraction and speed of light is equal to the speed of light in vacuum. This will be true for water as well.
Thus, the quantity which is equivalent to the product of the absolute index of refraction of water and the speed of light in water system is the speed of light in vacuum.
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Ilver oxide decomposes to form silver metal and oxygen gas chemical formual
The chemical formula of decomposition of silver oxide to form silver metal and oxygen gas is 2Ag₂O ⇒ 4Ag + O₂.
What is decomposition reaction?Decomposition reaction are those reactions in which the compounds are breakdown into simpler form.
In the given reaction, the silver oxide is decomposing in silver and oxygen.
2Ag₂O ⇒ 4Ag + O₂.
Thus, the chemical formula of decomposition of silver oxide to form silver metal and oxygen gas is 2Ag₂O ⇒ 4Ag + O₂.
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Select all that apply. Which of these conditions will cause an increase in the molar concentration of a solution?
A) Increasing the amount of solute
B) Adding water to the aqueous solution
C) Some of the water evaporating from the aqueous solution
D) Stirring the solution
Answer:
A
Explanation:
-Icreaseing the solute would increase the concentration
-increasing the solvent will decrease the concentration
How many moles of oxygen are contained in. 752 moles of calcium carbonate?
Answer:
2.256 moles of oxygen atoms
Explanation:
CaCo3 is calcium carbonate
every mole of calc carb has 3 moles of O atoms
.752 moles of this has 3 times as many moles of Oxygen atoms
According to the mole concept , there are 2.256 moles of oxygen in 0.752 moles of calcium carbonate.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
As 1 mole of calcium carbonate has 3 moles of oxygen ,
∴ in 0.752 moles of calcium carbonate there are 0.752×3=2.256 moles.
Thus,there are 2.256 moles of oxygen in 0.752 moles of calcium carbonate.
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22. Which of the following elements has the smallest electron affinity? A. carbon C. neon B, oxygen D. flourine
Answer:
carbon
Explanation: carbon is the answer
Why does the handle of a metal spoon get hotter than a wooden spoon
would?
A. The metal spoon gets more convection heating.
B. The metal spoon is a better thermal conductor.
C. The metal spoon is a better thermal insulator.
D. The metal spoon has a higher total mass.
Answer:B
Explanation:
The metal spoon is a better thermal conductor. Hence, option B is correct.
What is a thermal conductor?A thermal conductor is a material that allows the energy in the form of heat, to be transferred within the material, without any movement of the material itself.
Metals are good conductors. Laying on the metal handle of the metal cooking pot. It appears that the pot is sitting on top of a campfire.
Since metal is a good conductor of energy, the spoon gets hot because heat is transferred through the metal pot to its handle, and then to the metal spoon.
Hence, option B is correct.
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100 points litterly please help which term applies to what happens to visible light when it interacts with transparent glass
Answer:
The light goes through
Explanation:
The light goes through the transparent glass without being reflected or absorbed, for example, a window is a transparent glass, you never see light being reflected off of a window
Hope this helps (:
What is the molarity of 0.25 moles of KBr dissolved into 250 ml of solution?
Answer: 1.0 M
Explanation:
250 mL = 0.25 L
molarity = (moles of solute)/(liters of solution) = 0.25/0.25 = 1.0 M
How much heat is required to change temperature of 10g of water from 4°C to 8°C? (Water has a specific heat of 4.18)?
0 J 167.2 J 165.4 J 160.2 J
Answer: 167.2 J
Explanation:
Match each interaction type to the correct amount of potential energy.
The type of energy which is present between the repulsion interaction is the highest potential energy.
What is potential energy?Potential energy is the amount of energy that is possess by any body with respect to the electric charge posses in that and other factors also.
When molecules have a high attraction force then they have the low potential energy in them.When molecules have a great repulsion between them then they have the great potential energy in them.And molecules have the middle amount of potential energy then they have the balanced interaction.Hence, molecules in which repulsion interaction is present will have highest potential energy.
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A 390 ml of aqueous solution prepared by dissolving 0.6 g of aluminum nitrate al(no3)3 in water, the concentration of nitrate ion (no3-) is __________m. the molar mass of al(no3)3 is 213 g/mol
The concentration of the nitrate ion, NO₃¯ in the solution given the data is 0.0216 M
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of Al(NO₃)₃Mass of Al(NO₃)₃ = 0.6 g Molar mass of solute = 213 g/mol Mole of Al(NO₃)₃ =?Mole = mass / molar mass
Mole of Al(NO₃)₃ = 0.6 / 213
Mole of Al(NO₃)₃ = 0.0028 mole
How to determine the molarity of Al(NO₃)₃Mole of Al(NO₃)₃ = 0.0028 mole Volume = 390 mL = 390 / 1000 = 0.39 L Molarity of Al(NO₃)₃=?Molarity = mole / Volume
Molarity of Al(NO₃)₃ = 0.0028 / 0.39
Molarity of Al(NO₃)₃ = 0.0072 M
How to determine the molarity of NO₃¯Dissociation equation
Al(NO₃)₃(aq) <=> Al³⁺(aq) + 3NO₃¯(aq)
From the balanced equation above,
1 mole of Al(NO₃)₃ contains 3 moles of NO₃¯
Therefore,
0.0072 M Al(NO₃)₃ will contain = 0.0072 × 3 = 0.0216 M NO₃¯
Thus, the molarity of NO₃¯ in the solution is 0.0216 M
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What is the final temperature (in °C) of 120.1 g of water (specific heat = 4.184 J/g･°C) at 24.20°C that absorbed 950.0 J of heat?
i need help someone help me the chem 101 is due tomorrow
From the calculations, the final temperature of the object is 26.1 °C.
What is specific heat capacity?The specific heat capacity is defined as the temperature that is required to raise 1 Kg of a substance through a temperature rise of 1 K.
When;
H = 950.0 J
T1 = 24.20°C
m = 120.1 g
c = 4.184 J/g･°C
T2 = ?
H = mc(T2 - T1)
950 = 120.1 * 4.184(T2 - 24.2)
950 = 502.5T2 - 12160.5
950 + 12160.5 = 502.5T2
T2 = 950 + 12160.5/502.5
T2 = 26.1 °C
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Calculate after 2.00 y, 1.986 g of a radioisotope
remains from a sample that had an original mass of
2.000 g.
a. calculate the half-life.
b. how much of the radioisotope remains after 10.00 y?
Answer!
After 2 years, 1.986 g of a radioisotope material remains from a sample of the original mass of 2g, what is the half-life of the sample? - Radioactive decay occurs according to the formula:
A = A0 * exp(-ln(2) * t/T1/2)
The Original activity or mass A0 will decay to be A after time t where T1/2 is the decay time or half-life. If you fill in the values for A, A0 and t (= 2 years) you will end up with a value of approximately 188 years for the half-life.
What amino acids do the following sequences code for? uuc
The amino acid coded by the sequence code UUC is phenylalanine.
What are amino acids?An amino acid is an organic compound made up of an amine group and carboxylic group. There are total 20 amino acids are present.
Phenylalanine is coded by two code sequence UUU and UUC. It is not an essential acid, and its role in the body is not confirmed.
Thus, the amino acid coded by the sequence code UUC is phenylalanine.
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