Answer: 25
Explanation:
The new volume will be 18 L
What is volume?The volume of a dry gas of a given mass was inversely proportional to its pressure at constant temperature, according to Boyle's law. At moderate pressures and temperatures, most gases behave like ideal gases.
Calculation of new volume is shown as below:
The new volume of can be calculated by using Boyle's law.
[tex]P_{1} V_{1} = P_{2} V_{2}[/tex]
It is given that, [tex]P_{1}[/tex] = 0.9 atm. [tex]V_{1}[/tex] = 4 L, [tex]P_{2}[/tex] = 0.20 atm
Now, put the values of given data in above equation.
[tex]V_{2}[/tex] = [tex]P_{1}V_{1}[/tex] / [tex]P_{2}[/tex].
[tex]V_{2}[/tex] = (0.9) ×4 / 0.20
= 3.6 / 0.20
= 18 L
therefore, the new volume will be 18 L.
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Which expression represents the concentration of OH– in solution?
a. 10–14 / [H3O+]
b. [OH–] / 10–14
c. 10–14 – [H3O+]
d. 10–14 x [H3O+]
Match each definition to the appropriate term.
a. The condition that a reaction takes place without outside help _________
b. Difference of the enthalpy (of a system) minus the product of the entropy and absolute temperature ________
c. Sum of the internal energy plus the product of the pressure and volume for a reaction _________
d. The extent of randomness in a system __________
e. Solution in which no more solute can be dissolved in the solven ________
1. Gibbs free energy
2. Spontaneity
3. Saturated solution
4. Entropy
5. Enthalpy
Answer:
a. The condition that a reaction takes place without outside help Spontaneity
b. Difference of the enthalpy (of a system) minus the product of the entropy and absolute temperature Gibbs free energy
c. Sum of the internal energy plus the product of the pressure and volume for a reaction Enthalpy.
d. The extent of randomness in a system Entropy
e. Solution in which no more solute can be dissolved in the solven Saturated solution
Explanation:
(a) SPONTANEITY - The quality of being natural rather than planned in advance is described as spontaneity.
(b) GIBBS FREE ENERGY - Gibbs free energy, also known as the Gibbs function, Gibbs energy, or free enthalpy, is a quantity used to quantify the maximum amount of work that can be performed in a thermodynamic system when the temperature and pressure are held constant. The symbol ‘G' stands for Gibbs free energy.
(c) ENTHALPY - The heat absorbed or released during a process at constant pressure is equal to the Enthalpy shift. While “enthalpy” is often referred to as “heat content,” most people prefer to refer to it as “enthalpy.”
(d) ENTROPY - Entropy is the amount of thermal energy in a device per unit temperature that can't be used to do useful work. Since work is produced by ordered molecular motion, entropy is also a measure of a system's molecular disorder, or randomness. For several everyday phenomena, the idea of entropy offers profound insight into the direction of spontaneous change.
(e) SATURATED SOLUTION - A saturated solution is a chemical solution that contains the maximum amount of dissolved solute in the solvent. In a saturated solution, the extra solute will not dissolve. A number of factors influence the amount of solute that can be dissolved in a solvent to form a saturated solution.
calculate the amount of heat energy required to heat up 23.2 grams of ice from -21° C to 56° C ** please show your work**
The second option 1,870.4 Joules
If 1.3 moles of silicon dioxide react with 2.5 moles of carbon, how many grams of carbon
monoxide form?
Answer:
46.76 g
Explanation:
The reaction that takes place is:
SiO₂ + 3C → SiC + 2COFirst we determine the limiting reactant:
1.3 moles of SiO₂ would react completely with (3 * 1.3) 3.9 moles of C. There are not as many C moles, meaning that C is the limiting reactant.
Now we convert C moles (the limiting reactant) into CO moles, using the stoichiometric coefficients:
2.5 mol C * [tex]\frac{2molCO}{3molC}[/tex] = 1.67 mol COFinally we convert 1.67 moles of CO to grams, using its molar mass:
1.67 mol CO * 28 g/mol = 46.76 gTwo students prepared aqueous solutions of LiCl and measured the properties, as shown in the table above. Both students observed that the solid LiCl readily dissolved in H2O. The students drew particle diagrams to explain the changes in the enthalpy and entropy of dissolution for LiCl based on their results and observations. Based on this information, the better particle diagram was drawn by which student, and why is that diagram more accurate?
A) The better particle diagram was drawn by Student 1 because when LiCl dissolves in water, it dissociates into Li+ and Cl− ions causing an increase in entropy.
B) The better particle diagram was drawn by Student 1 because when LiCl dissolves in water, it dissociates into Li+ and Cl− ions indicating that the dissolution of LiCl is exothermic.
C) The better particle diagram was drawn by Student 2 because it shows that LiCl does not dissociate, resulting in a decrease in entropy for the dissolution of LiCl.
D) The better particle diagram was drawn by Student 2 because it shows that LiCl does not dissociate, resulting in an endothermic process for the dissolution of LiCl.
Answer:
Solubility
Explanation:
Solid LiCl dissolves in water because:
A. The Li+ ions are attracted to the oxygen atom (partially -ve charge) of water.
D. The Cl– ions are attracted to the hydrogen atom (partially +ve charge) of water.
The better particle diagram was drawn by Student 1 because when LiCl dissolves in water, it dissociates into Li+ and Cl− ions causing an increase in entropy. The correct option is option A.
What is solubility?The maximum amount of a material that may dissolve in another is known as its solubility. A saturated solution is created when a solvent can dissolve its maximum quantity of solute before reaching equilibrium.
A supersaturated solution results when extra solutes are dissolved past the equilibrium solubility limit under specific circumstances. More solute cannot raise the concentration in the solution past saturation or supersaturation. Instead, the extra solute begins to separate from the solution as a precipitate. The better particle diagram was drawn by Student 1 because when LiCl dissolves in water, it dissociates into Li+ and Cl− ions causing an increase in entropy.
Therefore, the correct option is option A.
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A chemical change occurs when two or more substances react to form one or more new substances. Which of the following best completes this statement about a chemical reaction?
In a chemical reaction, . . .
A. Atoms are neither created nor destroyed.
B. Some atoms from the reactants may be lost.
C. Extra atoms are always gained in the product.
D. Extra atoms are added to the product, if needed.
Explanation:
A) Atoms are neither created nor destroyed
number of atoms in the reactant is always equal to the number of atoms in the product and hence, option A is the right answer
periodic table for the first twenty elements
Answer:
periodic table for the first twenty elements
Answer:
Explanation:
hope this helps
Which of the following environments are low-level areas that can be temporarily or seasonally filled with water?
Rainforest
Swamp
Tundra
Wetland giving brainlist HAS TO BE RIGHT
Answer:
Rainforest
Explanation:
Swamps are permanently filled with water
and Tundras are dry and cold so the answer should be Rainforest
Answer:
its rainforest it's a it's
Explanation:
1. During an endothermic chemical reaction, a gas is consumed and a liquid produced.
a. Yes.
b. No.
c. Can't decide with information given.
2. A gas condenses to a liquid, neither absorbing nor releasing heat.
a. Yes.
b. No.
c. Can't decide with information given.
what is a heterogeneous mixture?
Answer:
A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture
A 10.0 mL sample of H2SO4 was exactly neutralized by 23.5 mL of 1.00 M KOH. Calculate the molarity of the acid. H2SO4(aq) + KOH(aq) —> K2SO4(aq) + H2O(l)
Answer:
1.175 M
Explanation:
The balanced reaction is:
H₂SO₄(aq) + 2KOH(aq) —> K₂SO₄(aq) + 2H₂O(l)First we calculate how many moles of KOH reacted, using the given concentration and volume:
1.00 M * 23.5 mL = 23.5 mmol KOHThen we convert moles of KOH to moles of H₂SO₄, using the stoichiometric coefficients of the balanced reaction:
23.5 mmol KOH * [tex]\frac{1molH_2SO_4}{2molKOH}[/tex] = 11.75 mmol H₂SO₄Finally we calculate the molarity of the acid:
11.75 mmol H₂SO₄ / 10.0 mL = 1.175 MIf 1.45 moles of Sodium Bromide are added to a 7.5 M solution, what is the volume of the solution made?
Answer:
0.193 L
Explanation:
Another way of writing the question would be: What volume of a 7.5 M Sodium Bromide solution would contain 1.45 moles.
To answer that we can use the definition of molarity:
Molarity = moles / litersWe input the given data:
7.5 M = 1.45 moles / litersAnd calculate how many liters are required:
1.45 mol / 7.5 M = 0.193 LDeviation will occur for volume assumption at ____________
A. Low Pressure
B. High Pressure
C. Constant Pressure
D. 1 atm
B. is it right?
Answer:
1.A
Explanation:
please click the heart and rate excellent and brainleist to
Answer:
B.Explanation:
The deviation of real gas from ideal gas behaviour occurs due to the assumption that, if pressure increases the volume decreases. The volume will approach a smaller number but will not be zero because the molecules will occupy some space that cannot be compressed further.Correct me if im wrong#CarryOnLearningcan be used to help an individual with an eating disorder learn better ways to cope with stress an
replace unhealthy behaviors with those that do not cause harm.
A. Preventative care
B. Hospitalization
C. Medication
D. Psychotherapy
Answer: Psychotherapy
Explanation:
Edge
Answer:
D. Psychotherapy
Explanation:
Did the test
The correct name for HIO2?
Answer:
iodous acid
Explanation:
iodous acid would also be known as HIO2
What attractive force pulls electrons toward protons to form chemical bonds?
A. Chemical bonding
B. Attraction of opposites
C. Electronegativity
D. Ionization energy
Answer:
C). Electronegativity.
Explanation:
'Electronegativity' is described as the tendency or a measure of the ability of an atom or molecule to attract electrons that leads to the formation of chemical bonds. It is denoted by 'χ', a Greek letter. The elements like Fluorine having a very high rate of electronegativity, its atom would attract the electrons more strongly while the elements with lesser electronegativity like Cesium would possess a lesser tendency to attract electrons towards it in order to form a bond. Thus, option C is the correct answer.
Which of the following compounds is least soluble in water?
A) iron (III) chloride
B) ammonium acetate
C) sodium hydroxide
D) magnesium carbonate
Answer:
B
Explanation:
Hybridization of Al in AlF3
Answer:
Hybridization of Al in AlF3 solid is sp3d2.
bond. Water is a polar solvent. The oxygen atom, being more electronegative, attracts the electron cloud toward itself. As the electron cloud is pulled by the oxygen atom, it carries a partial negative charge, and the hydrogen atoms carry a partial positive charge. This partial separation of charges in the water molecule makes it polar. Which intermolecular forces contribute to the dissolution of NaCl in water
Answer:
NaCl and water: Ion - Dipolo forces
NaCl and Hexane: Ion-ion force between Na+ and Cl− ions and London dispersion force between two hexane molecules
Explanation:
NaCl and water:
The ion-dipole force is established between an ion and a polar molecule. Polar molecules are dipoles, they have a positive end and a negative end.
H2O has an important charge separation in its atoms (the H has a positive partial charge and the O has a negative partial charge) and this causes permanent electrical dipoles in the water molecules.
Sodium chloride is an ionic compound formed of positive and negative charge ions, Na + and Cl-. Depending on their charge, these ions will be attracted to opposite charges in the water molecules (H attracts chloride ions and O attracts sodium ions), causing the salt to dissolve in water.
Explanation:
The _______________________________________ is often referred to as the powerhouse of the cell
Answer:
Mitochondria
Explanation:
Answer:
Mitochondria
Explanation:
Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.
QUESTION TWO
2.1
Discuss the process of the scientific method and clarify what is meant
by the science process skills.
(5)
Answer: The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century. It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptions can distort how one interprets the observation.
Explanation:
Hope this helps. :)
This subject is science.
All the members of one community living in a particular area make up a population. True or False.
Please help please please please.
Answer:
false
Explanation:
All the members of one species in a particular area are referred to as a population. All the different populations that live together in an area make up a community. The community of organisms that live in a particular area, along with their nonliving surroundings, make up an ecosystem.
The sky on Earth is blue because blue light is scattered through the atmosphere as the other colors of light pass
through undisturbed. Which nebulae have something similar happening?
Emission nebulae
Dark nebulae
Reflection nebulae
Planetary nebulae
Answer:
C
Explanation:
A sample of copper has a density of 10.50g/cm3 and measures of 0.400 dm long,20.0 mm high and 0.003 m thick. What is the mass in grams of this block of copper metal?
Please help with yes or no
The oxidation state/number for X in XO3- is:
Answer:
We can Observe that the Compound does not have the Positive or the negative Charge thus it is Neutral. Hence, the Oxidation Number of the Compound Will be 0. Thus, the Highest Oxidation Number of the X is 6.
The oxidation state/number for X in XO3 is determined as +6.
Oxidation state of X in XO3
The oxidation state/number for X in XO3 is determined from the overal charge of the compound and the charge of oxygen atom.
Overall charge of the compound = 0Oxidation state of oxygen (O) is -2The oxidation state of "X" is calculated as;
X + (3 x -2) = 0
X - 6 = 0
X = +6
Thus, the oxidation state/number for X in XO3 is determined as +6.
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Calculate the number of miles of magnesium,chlorine, and oxygen atoms in 5.00 moles of magnesium perchlorate
Answer:
5.00 mol Mg
10.0 mol Cl
40.0 mol O
Explanation:
Step 1: Given data
Moles of Mg(ClO₄)₂: 5.00 mol
Step 2: Calculate the number of moles of Mg
The molar ratio of Mg(ClO₄)₂ to Mg is 1:1.
5.00 mol Mg(ClO₄)₂ × 1 mol Mg/1 mol Mg(ClO₄)₂ = 5.00 mol Mg
Step 3: Calculate the number of moles of Cl
The molar ratio of Mg(ClO₄)₂ to Cl is 1:2.
5.00 mol Mg(ClO₄)₂ × 2 mol Cl/1 mol Mg(ClO₄)₂ = 10.0 mol Cl
Step 4: Calculate the number of moles of O
The molar ratio of Mg(ClO₄)₂ to Cl is 1:8.
5.00 mol Mg(ClO₄)₂ × 8 mol O/1 mol Mg(ClO₄)₂ = 40.0 mol O
A sheet of muscles called the diaphragm seals the bottom of this cavity true or false?
The blood transports the oxygen to every cell in the body true or false?
The cells need carbon dioxide to release energy true or false?
Carbon Dioxide is a waste product of respiration true or false?
Water is needed in the cells for respiration to occur true or false?
Glucose is made during the respiration true or false?
Respiration does not happen in the cells when we sleep true or false?
Air enters the body through the nose and mouth, and passes into the wind pipe of the trachea true or false?
Answer:
1. False. White blood cells do.
2. False. Every seven years your cells are in the process of dying and being replaced. Although some cells don't die but your cells don't last for more than a period of 7 years.
3. True.
4. True.
5. False. Explained in 2.
Explanation:
1. Write the chemical formula for possium (IV) oxyalide.
Answer:
Explanation:
Potassium oxyalide
Chemical formula K2O
Molar mass 94.196 g·mol−1
Appearance Pale yellow solid
Odor Odorless
How are lysosomes and vacuoles the same? How are
they different?
Answer:
This is the answer they're looking for:
Lysosomes and vacuoles both deal with waste materials. Lysosomes break down waste materials, and vacuoles store waste materials in the cell temporarily before the cell get rids of them.
Explanation:
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