Answer: has diffused more quickly, so it must be a
lighter gas. Its particles have greater velocity
than the particles of Y at the same temperature.
(Note though that they will both have the same
value for average kinetic energy.)
7 From the kinetic molecular theory we would
expect a solid to be more dense than its liquid,
and therefore that ice would sink in water.
8 Bubbles will be present through the volume
of the liquid. A brown gas is visible above the
brown liquid. As the two states are at the same
temperature, the particles have the same average
kinetic energy and are moving at the same
speed. The inter-particle distances in the gas are
significantly larger than those in the liquid.
9 At certain conditions of low temperature and low
humidity, snow changes directly to water vapour
by sublimation, without going through the liquid
phase.
10 Steam will condense on the skin, releasing energy
as it forms liquid at the same temperature (E–D
on Figure 1.4). This is additional to the energy
released when both the boiling water and the
condensed steam cool on the surface of the
Explanation:
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Question 24 (1 point)
To change 0.800 moles of liquid zinc to gaseous zinc, the amount of thermal energy required is
kj.
Ą Enter your three-digit answer.
Kingsley then adds 44.12 mL of NaOH to 250.00 mL of the HCOOH solution. The neutralization reaction resulted in 0.091 moles of HCOOH and 0.036 moles of HCOO- left in solution. Determine the pH of the resulting solution.
Answer:
pH = 3.34
Explanation:
We can calculate the pH using Henderson-Hasselbach's equation:
pH = pKa + log[tex]\frac{[HCOO^-]}{[HCOOH]}[/tex]for HCOOH, pKa = 3.75.
We can calculate [HCOO⁻] and [HCOOH] using the given number of moles for each one and the final volume:
Final Volume = 44.12 mL + 250 mL = 294 mL294 mL / 1000 = 0.294 L[HCOO⁻] = 0.036 mol / 0.294 L = 0.122 M[HCOOH] = 0.091 mol / 0.294 L = 0.310 MThen we proceed to calculate the pH:
pH = 3.75 + log[tex]\frac{0.122}{0.310}[/tex]pH = 3.34The pH of the resulting solution is 3.34.
Calculation of the pH of the solution:Since
Final Volume = 44.12 mL + 250 mL = 294 mL
Now
= 294 mL / 1000
= 0.294 L
Now
[HCOO⁻] = 0.036 mol / 0.294 L = 0.122 M
[HCOOH] = 0.091 mol / 0.294 L = 0.310 M
So, the pH should be
= 3.75 + log0.122/0.310
= 3.34
hence, The pH of the resulting solution is 3.34.
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Suppose that you are performing a titration on a monoprotic acid. Titration of this monoprotic acid required a volume of 0.1L of the base being used. If the same volume of a diprotic acid would instead have been used (same volume of a diprotic acid versus the originally used monoprotic acid), and if we assume furthermore that the concentration of the diprotic acid and the monoprotic acids are equal, how does the volume of base required to reach the endpoint for the diprotic acid compare to the volume of base required to reach the endpoint for the monoprotic acid?
A) More base is likely required to reach the endpoint for the diprotic acid than for the monoprotic acid under these conditionsB) Less base is likely required to reach the endpoint for the diprotic acid than for the monoprotic acid. C) Exactly the same amount of base is required for both monoprotic and diprotic acids under the situations described here.D) A completely different indicator will need to be used here.
Answer: A) More base is likely required to reach the endpoint for the diprotic acid than for the monoprotic acid under these conditions
Explanation:
The monoprotic acid (HA) has a valency of 1 and diprotic acid [tex](H_2A)[/tex] has a valency of 2.
As the concentration and volume of the diprotic acid and the monoprotic acids are equal.
The neutralization reaction for monoprotic acid is:
[tex]HA+BOH\rightarrow BA+H_2O[/tex]
The neutralization reaction for diprotic acid is:
[tex]H_2A+2BOH\rightarrow B_2A+2H_2O[/tex]
Thus more number of moles of base are required for neutralization of diprotic acid and thus the volume required will be more as concentration and volume of the diprotic acid and the monoprotic acids are equal.
WBCS are often called soldier of the body why
Answer:
White blood cells are cells of the system, which play a neighborhood in protecting the body against infectious diseases and foreign bodies. These cells flow with the blood throughout the body then scavenge and kill the parasites and foreign bodies. Hence, they are called soldiers of the body.
I hope it's helpful!
Glycerophospholipids (phosphoglycerides) are components of cell membranes.
a. True
b. False
Answer:
The correct answer is a. True
Explanation:
The main components of cell membranes are lipids and proteins. Lipids are responsible to form the structural barrier with the surroundings. The general structure of the membrane is made up of phospholipids, which have a part of the molecule with affinity to other lipids, and another part with affinity to water. The most common and abundant phospholipids are glycerophospholipids.
Therefore, the sentence is true.
Looking across period 4 of the periodic table, potassium (atomic number 19) is followed by calcium (atomic number 20), which is followed by scandium (atomic number 21). Which element should have the largest atomic radius?
how can you convert a saturated solution into an unsaturated solution?
Answer:
A saturated solution can be converted to an unsaturated solution by:
1) Adding solvent to it or,
2) Heating the solution or by increasing temperature.
Explanation:
scienceee (but mainly learn this in biology)
evaluate {(7.8)^2-(2.2^2
Answer:
56
Hope this helps :)
Which event is an example of sexual reproduction in plants?
A. Pine trees produce seeds in cones.
B. Mosses form spores in capsules.
C. A kalanchoe produces plantlets on its leaves.
D. A potato has buds that can grow into new stems.
Answer:
the correct answer to your question is b
What is the skin's natural oil?
a. sweet
b. Melanin
c. sebum
d. vegetable oil
help
Answer:
C. Sebum
Explanation:
C. Sebum
The human body is constantly generating new skin (somatic) cells through a process called mitosis (a type of asexual reproduction). Which of the following best describes the outcome of mitosis? ASAPP
Answer:
Wymień różnice między systemem palowym a systemem wiązkowym rośliny
How do the offspring produced by asexual reproduction differ from those produced by sexual reproduction?
A.
Offspring produced by asexual reproduction tend to be larger in adulthood.
B.
Offspring produced by asexual reproduction take more time to develop.
C.
Offspring produced by asexual reproduction are genetically identical.
D.
Offspring produced by asexual reproduction use more energy.
ASAP HELP
"How many grams of CaCl2 would be dissolved in 1.0 L of a 0.10 M solution of CaCl2? "
Answer:
2365 g
Explanation:
The mass of CaCl₂ will be 110.98 grams, this can be calculated by using the molarity formula.
MolarityIt is defined as the ratio of a number of moles of solute to the volume of solution in liters.
It is given by:
M= n/V
What information do we have?
V= 1.0 L
M= 1.0 M
Molar mass of CaCl₂ = 110.98g/mol
To find:
m=?
M= n/V
n= M/V
n= 1 mole
A Number of moles is the ratio of mass over the molar mass.
n = m/ M
1 mole= m / 110.98 g/mol
m= 110.98 grams
Thus, the mass of calcium chloride is 110.98 grams.
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1. Your friend has a balloon that can hold a volume of 5 L. If she added a 3 mol of CO2 gas at a pressure of 0.90 atm, what is the temperature of the balloon?
Answer:
I don't understand your question
What is the result of wave motion on water particles?
A. Water particles barely move forward; they move in a circular pattern.
B. Water particles barely move forward as they move up and down.
C. Water particles are pushed forward as they move up and down.
D. Water particles are pushed down as they move side to side.
Answer:
A. Water particles barely move forward; they move in a circular pattern.
Answer:
For k-12 its:
Explanation:
Water particles barely move forward; they move in a circular pattern.
^^
Vicky made the following list to describe humidity:
It is the amount of water vapor in the air.
It is shown on weather maps in millimeters or in inches.
It can seen on cold surface as water droplets.
Which statement best describes why the list is incorrect?
A)It can be seen on hot surfaces as water droplets.
B) It is shown on weather maps as a percent.
C) It is the amount of moisture in the air.
D) It is the temperature of water in the clouds
Answer: c
Explanation : because it make sense the most (srry if im wrong!)
Answer: It is the amount of moisture in the air.
Explanation:
In which of the following compounds does iron have the lowest oxidation number?
A. All are equal
B. Fe(OH)2
C. Fe(OH)3
D. FeOH
Answer:
C is the Answer
Follow me please
Mark brainliest
Compounds are formed by the same or the different molecules of the elements. Iron has the lowest oxidation number in FeOH. Thus, option D is correct.
What is the oxidation number?The oxidation number is the total gain or loss of the electrons by the atom to form a chemical bond with another atom in a molecule or a compound.
The oxidation state in a neutral compound adds up to zero. The oxidation number of oxygen is -2, and that of hydrogen a monoatomic ion is always +1.
Oxidation states are calculated as,
Fe(OH)₂:
X + 2 (-2 +1 ) = 0
X -2 = 0
X = +2
Fe(OH)₃:
X + 3 (-2 +1 ) = 0
X - 3 = 0
X = + 3
FeOH:
X -2 + 1 = 0
X - 1 = 0
X = +1
Therefore, iron has the lowest oxidation number in FeOH.
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25.0 mL of a 3.25 M solution is diluted to 450.0 mL. What is the concentration of the diluted solution?
Answer:
0.181 M
Explanation:
Begin by finding the total moles by using the volume and molarity given:
[tex]\frac{3.25 mol}{1000 mL} x \frac{25.0 mL}{1} = 0.08125 mol[/tex]
(Remember molarity is mol/L, which is equal to mol/1000 mL.)
Divide the moles by the volume after dilution:
[tex]\frac{0.08125 mol}{450.0 mL} x \frac{1000 mL}{1 L} = \frac{0.181 mol}{L} = 0.181 M[/tex]
The concentration of the diluted solution is 0.181 M.
Sodium metal reacts with water to produce hydrogen gas according to the following equation:
2Na(s) + 2H2O(l)2NaOH(aq) + H2(g)
The product gas, H2, is collected over water at a temperature of 25 °C and a pressure of 759 mm Hg. If the wet H2 gas formed occupies a volume of 8.11 L, the number of grams of H2 formed is _______g. The vapor pressure of water is 23.8 mm Hg at 25 °C.
Answer:
0.648 g
Explanation:
Step 1: Write the balanced equation
2 Na(s) + 2 H₂O(l) ⇒ 2 NaOH(aq) + H₂(g)
Step 2: Calculate the partial pressure of H₂
The total pressure (P) is equal to the sum of the partial pressures of hydrogen and water vapor.
P = pH₂O + pH₂
pH₂ = P - pH₂O
pH₂ = 759 mmHg - 23.8 mmHg = 735 mmHg
Step 3: Convert "pH₂" to atm
We will use the conversion factor 1 atm = 760 mmHg.
735 mmHg × 1 atm/760 mmHg = 0.967 atm
Step 4: Convert "25°C" to K
We will use the following expression.
K = °C + 273.15 = 25°C + 273.15 = 298 K
Step 5: Calculate the moles of hydrogen (n) formed
We will use the ideal gas equation.
P × V = n × R × T
n = P × V/R × T
n = 0.967 atm × 8.11 L/(0.0821 atm.L/mol.K) × 298 K = 0.321 mol
Step 6: Calculate the mass corresponding to 0.321 moles of hydrogen
The molar mass of H₂ is 2.02 g/mol.
0.321 mol × 2.02 g/mol = 0.648 g
i need help with this please
Answer:
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Explanation:
owa owa owa owa owa owa owa
Mixing hydrochloric acid (HCl) and aqueous calcium hydroxide produces water and aqueous Calcium Chloride. Write the complete and net ionic equations
Answer:
HCI+Ca(OH)2
Explanation:
True or false atoms are the smallest particle of an element that have that elements properties
Answer:false
Explanation:false
Answer:
true
Explanation:
hoping for the brainliest
I really need help on this question please help
Can someone help me please
A 70.0 g piece of metal wire is heated, and the temperature of the wire changes from 58.0°C to 152.0°C. The amount of heat absorbed is 972 Joules. What is the specific heat of the metal wire?
a 0.148 J/gC
b 6.77 J/gC
c 724 J/gC
d 0.0913 J/gC
Answer:
[tex]c=0.1477\ J/g^{\circ} C[/tex]
Explanation:
Given that,
Mass, m = 70 g
The temperature of the wire changes from 58.0°C to 152.0°C.
Heat absorbed, Q = 972 J
We need to find the specific heat of the metal wire. The heat absorbed is given by :
[tex]Q=mc\Delta T\\\\c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{972\ J}{70\ g \times (152-58)^{\circ} C}\\\\c=0.1477\ J/g^{\circ} C[/tex]
or
[tex]c=0.148\ J/g^{\circ} C[/tex]
So, the correct option is (a).
When sodium chloride and metallic sodium are
each dissolved in water A. both processes are
exothermic B. both processes are endothermic
C. the dissolution of metallic sodium is endothermic
D. the dissolution of metallic sodium is exothermic
E. the dissolution of sodium chloride is explosive
Answer:
B
Explanation:
don't try to do that at home
3. What is the name of the technique used to weigh the unknown liquid in part A of the
experiment?
Answer:
The technique is called weighing by difference
Which of these objects are malleable? Check all that apply
Answer: Options 1,3,6
Food is taken in and broken down by the _______ system. The raw materials are then transported throughout the body by the _______ system.
A. nervous; skin
B. respiratory; circulatory
C. digestive; circulatory
D. digestive; skin
Answer:
C. digestive; circulatory
Explanation:
It is the correct answer..
A vaccine used against an infectious disease may contain
Answer:
Vaccines include a variety of ingredients including antigens, stabilizers, adjuvants, antibiotics, and preservatives. They may also contain residual by-products from the production process.
If 20.0 g NaOH reacts with 30.0 g of H2SO4 how much Na2SO4 is produced?
Given: 2NaOH(aq) + H2SO4(aq) | Na2SO4(aq) + 2H2O(l)
Answer:
10g
Explanation:
find the limiting agent first
using mole ratio
2 moles of NAOH reacts with 2 moles of H2SO4
then 20g of NAOH require 20g of H2SO4
USING mole ratio on the limiting agent and product
2moles of NAOH produces 1 mole of NA2SO4
THEN
20g of NAOH will produce X
THEN solve for X
X =10g