how many OWLS are 4 desks?
Answer:
8
Explanation:
becus it just how that is ok kidhdod
Can someone please help me?
Answer: I don't know for sure but A and D seem like the best choices
Explanation:
Consider the following compounds: H2S, H2Se, H2Te. The molecule with the highest boiling point is _____, while the molecule with the highest vapor pressure is _____.
The molecule with the highest boiling point is H₂Te, while the molecule with the highest vapor pressure is H₂S.
What is the realation between boiling point and vapor pressure?Boiling point of any substnace is inverely proportional to its vapour pressure, and boilig point is directly proportional to the molecular mass of the substance.
In the given compounds H₂S, H₂Se and H₂Te molecular mass of Te is high and of Sulphur (S) is small. So the boiling point of H₂Te is highest and of H₂S is low so the vapor pressure of H₂S is highest.
Hence, H₂Te has the highest boiling point and H₂S has the highest vapor pressure.
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Which area of chemistry is concerned with reaction rates?
)
A)
A
inorganic
B)
kinetics
organic
D)
redox
Answer:
Explanation:
The branch of physical chemistry that is concerned with understanding the rates of chemical reactions is called Kenetics.
5 litres of 1m HCL is mixed with 2 litres of 1 m NaOH solution. Calculate the strength of the salt formed
Based on the molarity or molar concentration of the salt solution formed, the strength of the salt formed is 0.286 M.
What is salt strength of a solution?Salt strength of a solution is the concentration of that salt in a given volume of solution.
The concentration is given as the moles of the salt in a given volume of solution or molarity.
The moles of salt, NaCl formed when 5 litres of 1 M HCL is mixed with 2 litres of 1 M NaOH solution is given below:
1 mole of HCl reacts with 1 mole of NaOH to form 1 mole of NaCl.
2 litres of 1 M NaOH will react with 2 litres of 1 M HCl to form 2 litres of 1 M NaCl.
Moles of NaCl in 2 litres of 1 M solution = 2 × 1 = 2 moles of NaCl.
Total volume of mixture = 7 L
Molarity of NaCl = 2 moles / 7 litres= 0.286 M
Therefore, the strength of the salt formed is 0.286 M.
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Compared to rodents, rabbits have an extra pair of incisors and other skeletal structures that are different. They also have some features that are similar. What can scientists conclude from this observation?
Compared to rodents, rabbits have an extra pair of incisors and other skeletal structures that are different, scientist can conclude from this observation that they are serially homologous.
What are serially homologous?Serial homologous organs or structures are those that are structurally similar but have been modified to perform distinct functions.
As rodents and rabbits both have some similar functions and some changes in the skeletal structure, so that they both are serially homologous.
Hence scientist conclude that rodents and rabbits are serially homologous animals.
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A chemical reaction that produces electricity would be.
Answer:
Exothermic
Explanation:
Exothermic describes a process or reaction that releases energy
Brain controls __________ and ________ activity
Answer:
Brain controls all body parts or processess like thinking and our movements or physical activity.
Explanation:
The control center of the body is the nervous system. It directs the other body systems. It controls, monitors, and coordinates all body parts and processes. It also receives information from the environment and makes specific body parts acts on that information. The nervous system is made up of brain, the spinal cord, and the nerves.
Hi brainly user! In the picture are the Parts of a brain. Actually, this is what I drew before ^^
2) What is the change in enthalpy when 3.400 moles of aluminum react with excess ammonium nitrate (NH4NO3)
according to the equation? Is the reaction exothermic or endothermic?
2AI + 3NHANO3 → 3N2+ 6 H2O + Al2O3
AH = -2030kJ
Answer: See below
Explanation:
(i) 2AI + 3 NHANO3 → 3 N2+ 6 H2O + Al2O3 ΔH = -2030kJ
From stoichiometric coefiicients, it can be seen that:
When 2 moles of Al react, change in enthalpy = -2030kJ
So, when 3.4 moles of Al react, change in enthalpy = -(2030/2) x 3.4 kJ = -3451 kJ
Therefore, the change in enthalpy is -3451 kJ
(ii) The change in enthalpy is negative. This means heat is released during the reaction.
So the reaction is exothermic
The enthalpy change with the reaction of 3.4 moles of aluminum in the reaction is -3045 kJ. The reaction is exothermic in nature.
What is an exothermic and endothermic reaction?The reaction in which the energy is released and the value of change in enthalpy is negative is an exothermic reaction. The reaction in which the energy is absorbed with the positive value of change in enthalpy.
For a balanced chemical reaction, for 2 moles of Aluminum reaction, the change in enthalpy has been -2030 kJ. The change in enthalpy for the reaction of 3.4 moles of aluminum is given as:
[tex]\rm 2\;mol\;Al=-2030 \;kJ\\\\3.4\;mol\;Al=\dfrac{-2030}{2}\;\times\;3\;kJ\\\\ 3.4\;mol\;Al=-3045\;kJ[/tex]
The change in enthalpy for 3.4 moles of aluminum reaction is -3045 kJ. The reaction is exothermic in nature.
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Can someone please help me? :((
Answer:
I belive its d, not fully sure tho
What is obtained when (S)-2-butanol is treated with tosyl chloride and pyridine, followed by exposure to bromide
When (S)-2-butanol is treated with tosyl chloride and pyridine, followed by exposure to bromide, (R)-2-bromobutane is formed.
What is inversion of configuration?A substance may undergo inversion of configuration during nucleophilic substitution when the leaving group is bulky such that attack must occcur at the reverse side.
Hence, when (S)-2-butanol is treated with tosyl chloride and pyridine, followed by exposure to bromide, (R)-2-bromobutane is formed.
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Which best describes why a liquid needs a container when a solid does not?
Solids fill their containers, and liquids have definite shapes.
Solids have definite shapes, and liquids fill their containers.
Solids particles will expand to fill their containers, and liquid particles will expand as well.
Solids particles expand to fill their containers, and liquid particles do not.
Answer:
The second option
Explanation:
The process of elimiation.
1. We know liquids dont have a definite shape, they will morph into whatever enviroment theyre in
3. Solids dont expand based on what container theyre in, they either dont fit or they do
4. We know that liquid expands, so we can also rule this one out.
Which leaves us with option 2 to be correct.
An -ate or -ite at the end of a compound name usually indicates that the compound contains
Answer:
Your answer would be "Polyatomic anions."
I ask that you search to ensure there is not a similar question as it would save you time.
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I credit my answer to priyankatutor, his profile page is here:
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Can someone please help me? :(
Answer:
A, and b, hope this is right
Explanation:
The bond length of a covalent bond is the distance between the nuclei of two bonded atoms. The larger the atoms, the _____ this distance will be. Bond length therefore _____ as atomic size decreases.
Answer:
Bonding;lone
Explanation:
Predict the neutral organic product of the reaction of cycloheptene with water and sulfuric acid.
The term hydration of an alkene is defined as the addition of water across a double bond.
What is hydration?The term hydration of an alkene is defined as the addition of water across a double bond. The process of hydration always yields an alcohol as -OH is aded to one of the carbon atoms in the doube bond.
The reaction commences with the attack of the -OH group by water and is completed by a proton from acid. The neutral organic product of the reaction of cycloheptene with water and sulfuric acid is shown in the image attached.
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i need help now!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
C
Explanation:
Remark
You have to take into account what the brackets mean. They enclose a complex ion. So (SO4)3 means that you multiply the number of atoms inside the brackets by the number on the right.
Sulphur for example has a 1 after it, but the 3 on the outside multiplies the 1 by 3.
Oxygen has 4 after it. So the number of oxygens is 4*3 = 12
Givens
Blue = Aluminumyellow = sulphurgreen = oxygenAnswer
Blue = 2
Yellow = 3
Green = 12
C
What is one reaction that will form an arrhenius base?.
Answer:
An alkaline solution is another name for a solution that is basic. All alkali metals react readily with water to produce the metal hydroxide and hydrogen gas. The resulting solutions are basic.
An alkaline solution is another name for a solution that is base. All alkali metals react readily with water to produce the metal hydroxide and hydrogen gas. The resulting solutions are basic.
What is base?According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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Which most closely represents the structure of an element?
A. silver beads
B silver and gold beads
C. gold beads and ornaments
D. silver and gold beads and ornaments
Answer:
C. gold beads and ornaments
Explanation:
1.) ____ N2 + ____ H2 --------->___NH3
2.) ____ AlBr3 + ____ K2SO4 --------------> _____KBr + ____ Al2(SO4)3
Answer:
N2 + 3H2 ------> 2NH3
2AlBr + 3K2SO4------> 6KBr + Al(SO4)3
Challenge Air is a mixture of gases. By percentage, it is roughly 78 percent nitrogen, 21 percent oxygen, and 1 percent argon. (There are trace amounts of many other gases in air. If the atmospheric pressure is 760 mmHg, what are the partial pressures of nitrogen, oxygen, and argon in the atmosphere?
The partial pressures of gases in air at 760 mmHg are N₂ (592.8 mmHg), O₂ (159.6 mmHg) and Ar (7.6 mmHg).
What is partial pressure?Partial pressure is the pressure of a gas in a mixture of gases.
Air is a mixture of gases with 78% N₂, 21% O₂, 1% Ar and other gases in trace amounts. The partial pressure of a gas is proportional to its percentage.
Let's calculate the partial pressures of these gases, considering that the atmospheric pressure is 760 mmHg.
pN₂ = 760 mmHg × 78% = 592.8 mmHg
pO₂ = 760 mmHg × 21% = 159.6 mmHg
pAr = 760 mmHg × 1% = 7.6 mmHg
The partial pressures of gases in air at 760 mmHg are N₂ (592.8 mmHg), O₂ (159.6 mmHg) and Ar (7.6 mmHg).
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To reconstruct a face, which of the following characteristics can NOT be determined from the skull?
shape of the jaw
shape of the cheekbones
Shape of ears
width of eyes
Giving BRAINLIEST, please HELP!
Answer:
Third choice see below
Explanation:
Weight change of potato chip .45 - .42 = .03 gm
Assume all of the heat from burning the chip goes into the water (and none goes into the air or heating the can)
24 degrees - 21 degrees = 3 degrees C temp change
spec heat water = 1 cal / g -cal
50 gm * 3 degrees * spec heat water = 150 calories
150 calories = 150/1000 Calories
Now for the potato chip
150/1000 Calories / .03 gm = 5 Cal/gm
What are renewable resources?
They are resources that are in limited supply, but they can replenish themselves quickly.
They are resources that are in abundant supply and can replenish themselves quickly.
They are resources that are in limited supply and that take a long time to create.
They are resources that are in abundant supply but take a long time to create.
Answer:
B: They are resources that are in abundant supply and can replenish themselves quickly.
Explanation:
A renewable resource is one that can be used repeatedly and does not run out because it is naturally replaced. Examples of renewable resources include solar, wind, hydro, geothermal, and biomass energy.
what happens to oysters if there are too many hydrogen ions in the ocean
Question 16 of 25
When the maximum amount of solid is dissolved in a solute, what kind of
solution is it?
An ideal gas has a volume of 18.25 L at a temperature of 15.9 °C. The temperature of the gas is raised to 40.7 °C while the number of moles and the pressure of the gas are kept constant. What is the new volume of the gas (in L)?
B: An ideal gas has a volume of 10.8 L at a temperature of 25.0 °C and a pressure of 60 atm. The pressure of the gas is reduced to 370.0 mmHg, but the temperature and number of moles of the gas are kept constant. What is the new volume of the gas (in L)?
Answer:
V₂ = V₁ / T₁ * T₂ . If you prefer to set the final volume and want to estimate the resulting temperature, then the equation of Charles' law changes to: T2=T1/T1 multiplied by v^2.
Which of the following properties of an object can change when a substance undergoes a physical change?
Color
Odor
Reactivity
Size
PLS HELPPPP
Answer:
color , odor , size ( all the options except for reactivity )
Explanation:
A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
1) How many molecules of K2CrO4 are in 0.6 moles?
2) How many atoms of K are in 0.6 moles of K2CrO4?
3) You dilute 0.5 mol of NaOH to form 2 L of solution. What is the Molarity of that solution?
4) You dissolve 50 g of sugar to make 250 g of sugar water. What is the percent by mass?
5) A 2 L bottle of 5% vinegar has how much vinegar by volume?
Given the various data from the question, the answers to each question is given below:
1. How to determine the number of moleculesAvogadro's hypothesis
1 mole of K₂CrO₄ = 6.02×10²³ molecules
Therefore,
0.6 mole of K₂CrO₄ = 0.6 × 6.02×10²³
0.6 mole of K₂CrO₄ = 3.612×10²³ molecules
2. How to determine the number of atoms1 mole of K₂CrO₄ contains 2 moles of K.
Therefore,
0.6 mole of K₂CrO₄ will contain = 0.6 × 2 = 1.2 mole of K
From Avogadro's hypothesis,
1 mole of K = 6.02×10²³ atoms
Therefore,
1.2 mole of K = 1.2 × 6.02×10²³
1.2 mole of K = 7.224×10²³ atoms
Therefore, we can say that
0.6 mole of K₂CrO₄ = 7.224×10²³ atoms of K
3. How to determine the molarityMolarity is defined as:
Molarity = mole / Volume
From the question given above, we obtained the following:
Mole = 0.5 mole Volume = 2 LMolarity =?Molarity = mole / Volume
Molarity = 0.5 / 2
Molarity = 0.25 M
4. How to determine the volumeFrom the question given above, the following data were obtained:
Mass of solute = 50 gMass of solution = 250 gPercentage of sugar =?Percentage = (mass of solute / mass of solution) × 100
Percentage of sugar = (50 / 250) × 100
Percentage of sugar = 20%
5. How to determine the volumeTotal volume = 2 L
Percentage of vinegar = 5%
Volume of vinegar =?
Volume = percent × total volume
Volume of vinegar = 5% × 2
Volume of vinegar = 0.1 L
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What is the volume (in liters) of a 5.52 gram sample of O2 at STP?
Answer:
1
Recall that at STP, 1 mole of any ideal gas occupies 22.4 liters. Volume O2 gas = 0.0510 moles O2 x 22.4 L/mole = 1.14 liters (3 sig.
Explanation:
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