Answer:
V₂ = 2.0 Liters at STP conditions
Explanation:
Solving problem using the combined gas law
Given:
Case I Conditions Cast II Conditions
P₁ = 825mmHg P₂ = 760mm
V₁ = 2.30 Liters V₂ = ?
T₁ = 70°C + 273 = 343K T₂ = 0°C = 273K
Substitute into combined gas law assuming moles of gas remains constant; solve for unknown volume under case 2 conditions
P₁·V₁/n₁·T₁ = P₂·V₂/n₂T₂ => V₂ = P₁·V₁·T₂ / P₂·T₁ => note: in this solution, moles of gas remains constant as is disregarded in final calculation.
V₂ = (825mm)(2.3L)(273K) / (760mm)(343K) = 1.987 Liters (calculator answer) ≅ 1.9 Liters (2 sig figs based on given volume (V₁)
V₂ = 1.987 Liters ≅ 2.0 Liters (2 sig figs based on given volume (V₁)
What is the purpose of an experimental group?
The purpose of having experimental groups is to have sufficient data to be reasonably sure the relationship between the independent and dependent variable is not due to chance.
Answer:
the purpose of an experimental group are:
to enable the experimental study of one variable at a timeto check a different resultchemistry:
plz help me:D
Answer:
1 atom only with the unit u.
Explanation:
The formula mass of a substance is defined as the sum of the atomic masses of all atoms in a formula unit of the particular substance in question.
Thus the correct answer is option A
Initially a NaOH solution was standardized by titration with a sample of potassium hydrogen phthalate, KHC8H4O4, a monoprotic acid often used as a primary standard. A sample of pure KHC8H4O4 weighing 1.518 grams was dissolved in water and titrated with the NaOH solution. To reach the equivalence point, 26.90 milliliters of base was required. Calculate the molarity o
Answer:
0.2763M NaOH
Explanation:
Based on the reaction of hydrogen phtalate, KHP, with sodium hydroxide, NaOH:
KHP + NaOH → KNaP + H₂O
1 mole of KHP reacts per mole of NaOH.
In the equivalence point, the moles of NaOH added = Moles of KHP that were dissolved.
Thus, to solve this question, we must find the moles of KHP = Moles NaOH. With the moles and the volume of NaOH required to reach the equivalence point we can find molarity of NaOH solution:
Moles KHP = Moles NaOH (Molar mass KHP = 204.22g/mol):
1.518g * (1mol / 204.22g) = 7.433x10⁻³ moles NaOH
In 26.90mL = 0.0269L:
7.433x10⁻³ moles NaOH / 0.02690L
0.2763M NaOH2C(s) + 2H2(g) → C2H4(g): ΔH = +52.4 kJ/mol
Which statement about this reaction is correct? (3 points)
De una misma estación salen, en el mismo instante, dos trenes, con velocidades constantes de 72 y 90 [km/h]. ¿Qué distancia separa ambos trenes luego de 2 horas de viaje si se mueven en la misma dirección ... a) ... Y en el mismo sentido de circulación?
Answer:
144 km y 180 km respectivamente.
Explanation:
¡Hola!
En este caso, dado que tenemos dos trenes con velocidades diferentes, es posible multiplicar la velocidad de cada tren por el tiempo común, con el fin the hallar la distance recorrida; es de entender, que a mayor velocidad, mayor distance ha de recorrer el tren:
[tex]d_1=72km/h*2h=144km\\\\d_2=90km/h*2h=180km[/tex]
Así, entendemos que el tren número 1 recorre 144 kilómetros, mientras que el tren número 2, 180 kilómetros.
¡Saludos!
Cool air over warm water will:
Increase in temperature
Stay the same in temperature
Decrease in temperature
Answer:
Air and Water Temperature Increases
An increase in the air temperature will cause water temperatures to increase as well. ... Lower levels of dissolved oxygen due to the inverse relationship that exists between dissolved oxygen and temperature. As the temperature of the water increases, dissolved oxygen levels decrease.
Question 10 of 10
After a person eats a sugary snack, his blood sugar levels may rise for a short
period of time. However, the body works quickly to return blood sugar levels
to normal. What is this an example of?
O A. Respiration
B. Homeostasis
C Ethics
D. Development
10 The graph below compares the density, in grams per cubic centimeter (g/cm'), of
four different substances.
DENSITY OF SUBSTANCES
20
15
Density (g/cm)
10
5.
0
w
Y
Z
Substances
Based on information from the graph, which of the following best compares the
physical properties of two of the substances?
F. Substance X has less mass than substance Y has.
G. Substance W has less volume than substance X has.
H. Substance Y would have less mass than substance Z would have if they had the
same volume.
1. Substance Z would have less mass than substance W would have if they had the
same volume.
Answer: the awnser is A
Explanation:
Edge 2020
What has caused air quality in United States to improve/get better since the 1950s?
Answer:
better mileage on cars, took lead out of paint, smaller packaging like for delivery and store products, EPA laws updating
Answer:
Reducing pollution from transportation sources has led to healthier air for Americans. In cities, smog has been visibly reduced.
Explanation:
i hope this helped
Explain why silicon dioxide does not conduct electricity.
Answer:
Explanation:
Silicon dioxide doesn't have any mobile electrons or ions - so it doesn't conduct electricity either as a solid or a liquid.
A reaction in the laboratory yields 5.98 g KAI(SO2)2, How many moles of potassium aluminum
sulfate were produced?
Answer:
0.0308 mol
Explanation:
In order to convert from grams of any given substance to moles, we need to use its molar mass:
Molar mass of KAI(SO₂)₂ = MM of K + MM of Al + (MM of S + 2*MM of O)*2Molar mass of KAI(SO₂)₂ = 194 g/molNow we calculate the number of moles of KAI(SO₂)₂ contained in 5.98 g:
5.98 g ÷ 194 g/mol = 0.0308 molWhat does corona mean?
Answer:
.
Explanation:
Which layers have melting? (Choose 2) *
Lithosphere
Asthenosphere
Outer core
Inner Core
when high pressure is applied to a gas, its
Answer: volume decreases
Which object orbits Earth in both the Earth-centered (geocentric) and Sun-centered (heliocentric) models of our solar system?
A) the Moon
B) the Sun
C) Venus
D) Polaris
Answer:
the moon
Explanation:
pls complete the table with the correct answer
Answer:
The correct answer is :
Natural fibres: these fibers are found naturally in the environment such as cotton, hemp or wool, all are made naturally found fibers.
sr. no. name type
1 Cotton natural
2 Linen natural
3 Silk natural
4 Wool natural
5. Hemp natural
Artificial fibres: made from the polymerization of their monomer unit for example polyester made from coal and petroleum products.
sr. no. name type
1 Polyester artificial
2 Rayon artificial
3 Spandex artificial
4 Acrylic artificial
5. microfibers artificial
Find the kinetic energy of the horse using KE=1/2 mv².
A 500-kilogram horse runs at 5 meters/second. The horse’s kinetic energy is
[blank] joules.
Answer:
6250
Explanation:
so m=500 and v=5
so v²=25
using the equation we can do 1/2 x 500 x 25 = 6250
What are the characteristic property's of metals such as malleability and high conductivity are due to ?
Answer:
Metallic Bonding
Explanation:
Conductivity occurs when electrons or ions are free moving. The conductivity in metals is due to electrons being delocalized in a sea of electrons. Metals contain metallic bonding which allows the electrons to freely move.
Malleability happens when adjacent layers of positive ions move relative to one another while being in contact with the sea of electrons from the metallic bonding.
Chemistry test!!! no fake answers please and if you can explain then do it because I need all the help I can get!
Answer:
(−ΔH°1)+12(−ΔH°2)+(ΔH°3)+(ΔH°4)
I hope this helps you out!! :)
arrange the following atoms na, ca, a1, b, br, f in order of increasing electronegativity?
Explanation:
f, br, b, A1, CA, na in order of increasing electronegativity
Identify the decay mode
Please answer asap no explanation needed
(Look at picture)
Answer:
1921 :3 espero y te ayude crack
2 Al + Fe2O3 = Al2O3 + 2 Fe
If 0.915 mol Al2O3 is produced, how many grams of iron is produced?
Answer:
−7.389056fo3+5.436564f
−l2o3+2l
Explanation:
2al+f(2.7182822)o3=al2o3+2f(2.718282)
Step 1: Add -al^2o^3 to both sides.
7.389056fo3+2al+−al2o3=al2o3+5.436564f+−al2o3
−al2o3+7.389056fo3+2al=5.436564f
Step 2: Add -7.389056fo^3 to both sides.
−al2o3+7.389056fo3+2al+−7.389056fo3=5.436564f+−7.389056fo3
−al2o3+0fo3+2al=−7.389056fo3+5.436564f
Step 3: Factor out variable a.
a(−l2o3+2l)=−7.389056fo3+5.436564f
Step 4: Divide both sides by -l^2o^3+2l.
a(−l2o3+2l)
−l2o3+2l
=
−7.389056fo3+5.436564f
−l2o3+2l
a=
−7.389056fo3+5.436564f
−l2o3+2l
How does the strength of a metallic bond compared to other types of bonds?
a. metallic bonds are weaker than ionic bonds or covalent bonds.
b. metallic bonds are equal in strength to ionic and covalent bonds.
c. metallic bonds are weaker than ionic bonds but stronger than covalent bonds.
d. metallic bonds are weaker than covenant bonds but stronger than ionic bonds.
While metallic bonds have the strong electrostatic force of attractions between the cation or atoms and the delocalized electrons in the geometrical arrangement of the two metals. ... Metallic bonds are malleable and ductile, while covalent bonds and ionic bonds non-malleable and non-ductile.
What is the molar mass of H2CO3
Answer:
Molar mass of H2CO3 : 62.03 g/mol
✓ What kind of carbon storages would be the least affected by humans?
Answer:
trio
Explanation:
Please answer quickly!! 1. Which of the following statements is true?
a. The breaking of bonds is exothermic, and therefore has a negative delta H value.
b. The breaking of bonds is exothermic, and therefore has a positive Delta H value.
6. The breaking of bonds is endothermic, and therefore has a negative Delta H value.
d. The breaking of bonds is endothermic, and therefore has a positive Delta H value
Answer:
d
Explanation:
a positive change in enthalpy is required to break a bond, while a negative change in enthalpy is accompanied by the formation of a bond. Bond breaking in endothermic because it requires energy, therefore delta H is positive.
Which of the following ions will form the weakest bond with Na+?
Br^-
F^-
CI^-
I^-
Answer:
Iodide ion, I- will form the weakest bond with sodium ion, Na+
Explanation:
Electronegativity is the ability with which a neutral atom attracts electrons to itself.
The electronegativity of the halogens decrease on going down the group among the halogens. This is is because on going down the group, the atomic size as well as ionic size of the atoms in the group increases. This increase decreases the effect of the attraction of the positive nucleus on the electrons. Thus, valence electrons can be more readily removed.
The transfer of electrons from metallic sodiummto a halogen results in annionic bond between the two atoms. The strength of the ionic bond decreases on going down the group due to decrease in electronegativity. Thus, iodide ion, I-, which is the least electronegative among the given options will form the weakest bond with Na+.
Which statement describes the Arrhenius interpretation of acids and bases?
It has a wider range of applications than the Bronsted-Lowry interpretation.
It has a wider range of applications than the Lewis and Bronsted-Lowry interpretations.
It is used in situations that involve bases that do not produce hydroxide ions.
It is limited to situations that involve aqueous solutions or specific compounds.
Answer: Composition is an orderly arrangement of visual structures (elements and principles) to create a mood, add meaning and direct the viewers' attention to the purpose of the artwork. Compositions are said to be 'designed' according to the specific intent of the artist.
The statement that describes the Arrhenius interpretation of acids and bases is that it is limited to situations that involve aqueous solutions or specific compounds. Therefore, option D is correct.
What is Arrhenius's interpretation?Arrhenius's interpretation defined an acid as a substance that increases the concentration of hydrogen ions (H⁺) when dissolved in water and a base as a substance that increases the concentration of hydroxide ions (OH⁻) when dissolved in water.
According to Arrhenius's interpretation, when an acid is dissolved in water, it releases H⁺ ions, which then react with water molecules to form H₃O⁺ ions, also known as hydronium ions.
Similarly, when a base is dissolved in water, it releases OH⁻ ions, which then react with water molecules to form H₂O molecules and more OH⁻ ions. Thus, option D is correct.
Learn more about Arrhenius, here:
https://brainly.com/question/15196401
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You have an electrolyte that dissociates completely and conducts electricity well. What type of electrolyte would it be classified as?
Answer:
Strong Electrolyte
Explanation:
Electrolytes are classified into strong and weak electrolytes. Strong electrolytes are electrolytes that completely dissociate in an aqueous solution and are as well good conductors of electricity while weak electrolytes are those that are not completely dissociated in an aqueous solution and are not very good conductors of electricity.
Examples of strong electrolytes are strong acid, strong base, and salts. Examples of weak Electrolyte are weak acids and weak bases.
Thus the correct answer is strong electrolytes.
a 5 g ice cube starts life at -1 C if 2182.5 j are added to it what will be the final temperature upon his demise ?
Answer:
Final Temp = 23.92°C
Explanation:
ΔH(total) = (m·c·ΔT)ice + (m·ΔH(f))melt'g + (m·c·ΔT)water
2182.5j = (5g)(2.092j/g·°C)(1°C) + (5g)(334.56j/g) + (5g)(4.184j/g·°C)(ΔT)
(2182.5 - 10.46 - 1672.8)j = 20.92j/°C·ΔT
ΔT = (2182.5 - 10.46 - 1672.8)j / 20.92j/°C = 23.92°C
Since the melting ice starts and ends at 0°C and is then warmed to 23.92°C then the temperature change is also the final temp of the water based upon given energy input values.