Answer:
Cause(s) the temperature of the surroundings to decrease. - 1. Endothermic reaction.
Cause(s) a change in the temperature of the surroundings. - 3. Both.
Cracking open a cold-pack. - 1. Endothermic reaction.
Burning Wood. - 2. Exothermic reaction.
Absorb(s) energy from the surroundings. - 1. Endothermic reaction.
Cause(s) the temperature of the surroundings to increase. - 2. Exothermic reaction.
Release(s) energy to the surroundings. - 2. Exothermic reaction.
A saturated solution of sulfur dioxide is prepared by dissolving SO2(g) in 100. g of water at 10.°C and standard pressure.
Determine the mass of SO2 in this solution.
A.) 15g to 18g
B.) 40g to 43g
C.) 53g to 56g
D.) 6g to 8g
Answer:
The correct option is;
A.) 15 g to 18 g
Explanation:
The solubility of sulfur dioxide at room temperature = 94 g/L of water forming sulfurous acid as follows;
SO₂ + H₂O ⇄ HSO₃⁻ + H⁺
Which is a partial reversibly association with water molecules
Whereby 1 liter of water weighs 1 kg
9.4 gram of SO₂ will dissolve in 100 g of water at room temperature of 23 to 24°C
The solubility increases as the temperature reduces therefore as shown from the sulfur dioxide solubility chart we have;
At 10°C the solubility of SO₂ (g) is midway between 150 g to 200 g per kg of water
Therefore;
The solubility of SO₂ (g) is between 15 g to 18 g per 100 of water.
The mass of SO2 in the given solution should be an option a 15g to 18g.
Calculation of the mass:Since the solubility of sulfur dioxide at room temperature = 94 g/L of water forming sulfurous acid likewise:
SO₂ + H₂O ⇄ HSO₃⁻ + H⁺
This represents the partial reversibly association along with water molecules
Here 1 liter of water weighs 1 kg
So we can say that
9.4 gram of SO₂ will dissolve in 100 g of water at room temperature of 23 to 24°C
Due to this, there is an increase in solubility this result in decrease in the temperature
Also, At 10°C the solubility of SO₂ (g) is midway between 150 g to 200 g per kg of water
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Using the phase diagram for H2O what phase is water in at 1 atm pressure and 50oC? A. It is in the solid phase B. It is at its melting point C. It is in the liquid phase D.It is in the gas phase
Answer:
C. It is in the liquid form.
Explanation:
1 atm is the normal pressure, so the question is really just what is H2O at 50C. The answer to that is liquid.
Also, I don't know why someone deleted my answer. My answer was correct and had a correct solution.
By examining the phase diagram of water it is clear that, at 1 atm pressure and 50 degree Celsius temperature, water exists at liquid state.
What is phase diagram?Phase diagram of a substance graphically represents the state of the substance at different temperature and pressures. Phase diagram helps to understand the point at which the three state of matter coexists and that point is called triple point.
Various physical properties can be determined using the phase diagram of a substance. Melting point, boiling point, freezing point etc. can be identified for the substance from its phase diagram.
Phase diagram of water represents the three states of water that are gas, liquid water and ice. Water freeze at 0°C and boils at 100 °C . at 1 atm pressure and 50 degree Celsius, water exists in liquid state.
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Questions
Warm air rising in the atmosphere is an example of heat being transferred by
o absorption
O conduction
O convection
O radiation
Answer:
the answer is convection
convection
Classify the elements as diatomic or monatomic. If necessary, refer to the periodic table to help you identify the diatomic elements.
carbon
helium
hydrogen
iodine
oxygen
sodium
Answer:
carbon- monatomic
helium- monatomic
hydrogen- diatomic
iodine- diatomic
oxygen- diatomic
sodium- monatomic
Explanation:
the diatomic elements can be remembered with this sentence:
Have No Fear Of Ice Clear Brownies
have- hydrogen
no- nitrogen
fear- fluorine
of- oxygen
ice- iodine
clear- chlorine
brownies- bromine
The diatomic molecules are hydrogen ,iodine ,oxygen while the monoatomic molecules are carbon, helium and sodium.
What are elements?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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What volume of hydrogen will be produced at STP by the reaction of 67.3 g of tin with excess water according to the following reaction?
Answer:
Sn + 2H2O ==> Sn(OH)2 + 2H2
67.3 g Sn x 1 mol/119 g x 2 mol H2/mol Sn x 22.4 L/mole = answer in liters
Explanation:
Sn + 2H2O ==> Sn(OH)2 + 2H2
67.3 g Sn x 1 mol/119 g x 2 mol H2/mol Sn x 22.4 L/mole = answer in liters
The volume of hydrogen that will be produced from the reaction of 67.3 g of tin with excess water is 12.68 L
How to determine the mole of tin Mass of Sn = 67.3 gMolar mass of Sn = 119 g/mol Mole of Sn =?Mole = mass / molar mass
Mole of Sn = 67.3 / 119
Mole of Sn = 0.566 mole
How to determine the volume of H₂ producedSn + 2H₂O —> Sn(OH)₂ + H₂
From the balanced equation above,
1 mole of Sn reacted to produce 1 mole of H₂.
Therefore,
0.566 mole of Sn will also react to produce 0.566 mole of H₂
Recall
1 mole of H₂ = 22.4 L at STP
Therefore,
0.566 mole of H₂ = 0.566 × 22.4
0.566 mole of H₂ = 12.68 L
Thus, 12.68 L of H₂ were obtained from the reaction.
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1. The polymerization of amino acids produces:
organic acids
lipids
proteins
carbohydrates
2. Which group of compounds has a –OH functional group?
aldehydes
esters
carboxyl acids
alcohols
3. Unsaturated compounds _____.
do not readily react
have a high activation energy
require UV light to react
are very reactive
4. Butene would have ____ carbon atoms and a_____ bond.
- 4 - double
- 2 - single
Answer:
1. Proteins
2. Alcohol
3. Unsaturated compounds are very reactive.
4. Butene has 4 carbon atoms and one double bonds attached to it
Explanation:
1. The polymerization of amino acids gives protein.
Polymerization is a process whereby smaller unit molecules of organic compounds combine repeatedly, in a regular fashion to form a larger organic structure or compound.
The smaller units are called monomers while the larger compound formed are called the polymers.
In this case, the smaller units are the amino acids held or linked together by peptide bonds to form a polymer called proteins.
2.
Compounds with functional group of -OH are called alcohols.
Alcohols are also known as alkanols and they belong to a class of organic compounds where -OH functional group is attached to an alkyl group. They have general formula of CₓH₂ₓ₊₁OH where x refers to the number of carbon atom. They're also categorized into primary, secondary and tertiary alcohols based on the type of carbon in the which the functional group (-OH) is attached to.
3.
Unsaturated compounds are very reactive due to the presence of lone pairs of electrons present in them.
4. Butene actually has 4 carbon atoms and several single bonds attached to it.
Butene has a total of 12 bonds and 1π (pi-bond) while several 11σ (sigma bonds) are attached to it.
Need help, thank you!
Answer:
B the answer is B thank you
Liquid acetone is ______________.
A incompressible and has a definite shape.
B compressible and has definite volume.
C incompressible and has an indefinite shape.
D compressible and has an indefinite volume.
I'll give brainliest
In going through the three physical states of matter, water would normally undergo changes in
A) composition.
B) density.
C) mass.
D) weight.
Answer:
COMPOSITION
Explanation:
Brainliest plz
Which is the best summary of the kinetic theory?
A. Potential energy is converted to kinetic energy.
O B. Atomic motion is constant at all temperatures.
C. Atoms and molecules are always in motion.
O D. Energy cannot be created or destroyed.
SUBMI
Answer:
C. Atoms and molecules are always in motion.
2 The precipitate formed when sodium hydroxide reacts with solutions
containing metal ions is the corresponding METAL HYDROXIDE.
a Write word equations and symbol equations including state symbols)
to show how the following solutions react with sodium hydroxide:
magnesium sulfate, MgSO4
ii iron(II) sulfate, FeSO4
ili iron(III) chloride, FeCl3
iv copper(ll) chloride, CuCl2
Answer:
Explanation:
MgSO4 + 2NaOH -------> Mg(OH)2 + 2NaSO4
CuCl2 +2NaOH -------> Cu (OH)2 + 2Nacl
FeCl3 + 3NaOH ----> Fe(OH)3 + 3NaCl
based on this can you try for the FeSO4. similar to first reaction showed above
Why do you subtract the mass of the solute from the total mass desired when making mass percent calculations?
We can represent the concentration of a material even when we don't know its molecular mass, since mass percentage and parts per million or a billion are just alternative ways of expressing the ratio of the mass of a solute to the mass of the solution.
What is molecular mass ?The mass of a certain molecule is its molecular mass, which is expressed in daltons. Because they contain various isotopes of an element, multiple molecules of the same substance can have distinct molecular weights.
More solute can be dissolved in a given volume of solution to increase concentration, since doing so increases the mass of the solute. By allowing some of the solvent to evaporate, which reduces the volume of the solution, concentration can be increased.
The amount of a solute that is present in a specific amount of solvent or solution is known as the concentration of a solution. Controlling the stoichiometry of reactants for solution reactions requires knowledge of the solute concentration.
Thus, We can represent the concentration of a material even when we don't know its molecular mass.
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Which term should replace the question mark?
Answer:
Can you explain a little bit more?
Explanation:
The symbol ∆hf0 stands for
Answer:
standard heat of formation for compound
Explanation:
What information does a phase diagram give?
A. The effect of temperature on volume changes of substances
B. The effect of temperature and pressure on the phase of a
substance
C. The effect of concentration on the freezing point of a solution
D. The effect of oxidation number on the melting point of a metal
Where are you likely to find Safety Data Sheets at the client site? (choose the
best 2 options)
On the computer as an electronic file
In a work area where the chemicals are stored or used
In the manager's office
In the lobby area
Please I need this answer quick I will give brainliest
A student decreases the temperature of a 417 cm³ balloon from 278 K to 231 K.
Assuming constant pressure, what should the new volume of the balloon be?
376 cm³
417 cm³
462 cm³
924 cm³
Answer:
The new volume of the balloon is [tex]346.5\ cm^3[/tex].
Explanation:
Initial volume of a balloon is 417 cm³
The temperature decreases from 278 K to 231 K.
It is required to find the new volume of the balloon if the pressure is constant pressure. At constant pressure, volume is directly proportional to the temperature. So,
[tex]V\propto T[/tex]
i.e.
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]
V₂ is final volume.
[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{417\times 231}{278}\\\\V_2=346.5\ cm^3[/tex]
So, the new volume of the balloon is [tex]346.5\ cm^3[/tex].
How many kilograms of gasoline fill a 12.0-gal gas tank
Answer:
29.98kg
Explanation:
12.0 gallons * (3.78541178 liters/gallon) * (1000 mL/liter) * (0.66 g/mL) * (1 kg/1000 g) = 29.98 kg
29.98kg of gasoline fill a 12.0-gal gas tank
what is gasoline ?gasoline or gas or petrol a mixture of volatile, flammable liquid hydrocarbons which is derived from petroleum and used in many application like fuel in internal-combustion engines, solvent for oils and fats.
It is a by-product of the petroleum industry, used in automobile fuel due to its high energy of combustion and easily mix with air in a carburetor.
Gasoline is produced by distillation by separating the volatile substance, later on other designed process yield of gasoline from crude oil by splitting large molecules into smaller ones by cracking method.
12.0 gallons * (3.78541178 liters/gallon) * (1000 mL/liter) * (0.66 g/mL) * (1 kg/1000 g) = 29.98 kg of gasoline fill the tank.
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Which type of crystal is typified by a sea of delocalized electrons
surrounding the lattice?
O A. lonic
B. Metallic
OC. Macromolecular
D. Chemical
Reset Selection
B.metallic is the answer hope this helped
The correct answer is option B. Metallic.
What explains the structure of metals and delocalized electrons?
Metal is composed of a huge structure of atoms arranged in a regular pattern. Electrons from the outer shell of a metal atom are delocalized and can move freely throughout the structure. This sharing of delocalized electrons results in strong metal bonds.
Metallic bonds are electrostatic attraction between metal cations and the negatively charged ocean of delocalized electrons. The sea of delocalized electrons contains only valence electrons, not core electrons.
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Most scientists recommend reducing carbon dioxide emissions. Less carbon dioxide in the atmosphere would be expected to?
Answer:
the air would be much cleaner and better for us to breath.
Explanation:
Which value gives the number of particles in 1 mol of a substance?
6.02 x 1021
6.02 x 1022
6.02 x 1023
6.02 x 1024
Answer: it's C 6.02×10²³
Explanation:
I got it right in edge
Calcium nitrate, Ca(NO3)2 , is a(n) ___________________.
element
compound
heterogeneous mixture
homogeneous mixture
The type of radioactive decay in which the mass number and atomic number remain unchanged is (2 points) Select one: a. beta radiation. b. alpha radiation. c. positron radiation. d. gamma radiation.
Answer:
d.
Explanation:
a. beta radiation - electrons that have negative charge, and when they leave a nucleus , the charge or atomic number of the nucleus will change.
b. Alpha radiation - nuclei of He, atomic number and mass number will be changed.
c. positron radiation - positrons are similar to electrons but have positive charge, so , the charge or atomic number of the nucleus will change.
d. gamma radiation is electromagnetic waves, does not have charge and mass.
Answer:
the answer is d. gamma radiation
Explanation:
How do the HOX genes in the paddlefish match the HOX genes in human
Answer:
Hox are transcription factors that are evolutionarily conserved across bilaterians and, therefore, they share sequence homology between paddlefish and humans .
Explanation:
The Hox genes represent a family of homeodomain transcription factors that play roles in the development of the axial and appendicular skeleton, being therefore critical during embryonic development. In this case, the human Hox genes are homologous to homeobox genes found in the paddlefish. These genes have a DNA-binding domain of 60 amino acids which is evolutionarily conserved in bilaterian species including paddlefish and human species.
Let's say you added too much magnesium in the amount of 0.1594 g. How much 8.00 M HCl (in mL) would be required to decompose the excess Mg present?
Mg(s) + 2 HCl(aq) --> MgCl2(aq) + H2(g)
Answer:
1.65×10^-3 L or 1.65 mL
Explanation:
Number of moles of magnesium in the excess reagent= mass of excess reagent/ molar mass of magnesium
Mass of excess magnesium= 0.1594 g
Molar mass of magnesium= 24 gmol-1
Number of moles of magnesium= 0.1594/24 = 6.6×10^-3 moles
From the reaction equation;
1 mole of magnesium reacted with 2 moles of HCl
6.6×10^-3 moles of magnesium will react with 6.6×10^-3 moles × 2= 13.2×10^-3 moles of HCl
But we know that;
Number of moles of HCl= concentration of HCl × volume of HCl
Volume of HCl= number of moles of HCl/ concentration of HCl
Since concentration of HCl= 8.00M
Volume of HCl= 13.2×10^-3/8.00= 1.65×10^-3 L or 1.65 mL
what is characteristics of the 6kingdoms
Answer:
Archaea, Bacteria, Protista, Fungi, Plantae, and Animalia
What is characteristics of the 6 kingdoms.
6 kingdoms of what? Are you talking about biology?
If yes I assume you're talking about the defitions for the animal kingdom made by Woese and his colleagues in 1977.
Eubacteria: Single-celled bacterial organisms.
Archaebacteria: Single celled bacterial organisms that live in extreme enviroments
Protista : Single-celled organisms more complex than bacteria
Plantae: Multi-celled, complex organisms that produce their own food
Fungi: Multi-celled organisms that don't produce their own food
Animalia: Complex, multi-celled, organisms that consume other organisms for food.
20. Which of the following is NOT true for the atoms 13N, 14N, and 'N?
a. They all have the same mass number.
b. They are isotopes.
c. They all have the same atomic number.
d. They all have 7 protons.
e. They all have 7 electrons.
Answer:
a ,e
Explanation:
math
They all have the same mass number
In the reaction:
CO3²- + H+ --> HCO³-
The CO3²- ion is considered a base because it
1) accepts a proton
2) accepts an electron
3) donates a proton
4) donates an electron
Thanks! :)
Answer:
1) accepts a proton
Explanation:
CO₃⁻² is a base here because it is accepting a proton ( H⁺) through coordinate bonding by donating a pair of electron .
So option (1) is correct .
22.00 g of CO2 has a volume of 50.00 L and a pressure of 0.8210 atm. What must be the
temperature of the gas?
Answer:
T = 9.875K
Explanation:
The ideal gas Law is PV = nRT.
P = Pressure
V = Volume
n = amount of substance
R = 8.314 J/(K. mol)
T = Temperature in Kelvin
22g CO2
CO2 Molar Mass = 44g/mol
C = 12g/mol
O = 16g/mol
P = 0.8210atm
V = 50L
PV = nRT
0.8210 x 50 = 8.314 x 0.5 x T
41.05 = 4.157T
T = 41.05/4.157
T = 9.875K
Find the Empirical formula for 0.765g Cr, 0.235g O
Answer:
CrO
Explanation:
0.765g Cr
0.235g O
O = 16g/mol
Cr = 52g/mol
O 2-
Cr 2+, 3+, 6+
0.765 + 0.235 = 1
so 76.5% Cr
23.5% O
76.5/52 = 1.47/1.47 = 1
23.5/16 = 1.47/1.47 = 1
CrO
