Which of the following accurately describes the behavior of water when subjected to temperature change?
A. A mass of water will expand if heated from 0°C to 2°C.
B. The volume of water will increase if cooled from 3°C to 2°C.
C. The volume of water will decrease if heated from 6°C to 7°C.
D. A mass of water will contract if cooled from 1°C to 0°C.
The answer option which accurately describes the behavior of water when subjected to temperature change is: B. The volume of water will increase if cooled from 3°C to 2°C.
Water refers to a liquid molecule that is typically made up of two (2) main chemical elements in the following proportion;
Two atoms of hydrogen.One atom of oxygen.Generally, the volume of water is directly proportional to its temperature.
Hence, an increase in the temperature of water causes the volume of water to increase because its molecules gain energy and move more rapidly, which in turn makes the water molecules to be further apart.
When water is cooled, it contracts (decrease in volume) until a temperature of approximately four degree Celsius (4°C) is reached and then it begins to expand (increase in volume) at lower temperatures (3°C to 2°C), until it reaches its freezing point, which is typically at zero degree Celsius (0°C).
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For the reaction represented by the equation pb(no3)2 + 2ki → pbi2 + 2kno3, how many moles of lead(ii) iodide are produced from 300. g of potassium iodide and an excess of pb(no3)2?
a. 11.0 mol selected:
b. 1.81 mol
c. 3.61 mol
d. 0.904 mol
Number of moles equals of potassium iodide;
The molar mass of potassium iodide is 166 g/mole
Moles = 300/166
= 1.8072moles
According to the equation;
2 moles of KI produces 1 mole of PbI2 9lead (ii) iodide
Therefore; the number of moles of lead (ii) iodide produced will be;
= 1.8072/2
= 0.9036moles
Thus the number of moles of lead (ii) iodide is 0.904 mole
Answer : The correct option is, (d) 0.904 mole
Explanation : Given,
Mass of potassium iodide = 300 g
Atomic mass of potassium iodide = 166 g /mole
First we have to calculate the moles of potassium iodide.
[tex]\text{Moles of KI}=\frac{\text{Mass of KI}}{\text{Molar mass of KI}}=\frac{300g}{166g/mole}=1.807mole[/tex]
Now we have to calculate the moles of lead(ii) iodide.
The given balanced chemical reaction is,
[tex]Pb(NO_3)_2+2KI\rightarrow PbI_2+2KNO_3[/tex]
From the given balanced chemical reaction, we conclude that
As, 2 moles of potassium iodide react to give 1 mole of lead(ii) iodide
So, 1.807 moles of potassium iodide react to give [tex]\frac{1.807}{2}=0.904[/tex] mole of lead(ii) iodide
Therefore, the number of moles of lead(ii) iodide produced are, 0.904 mole
An unknown compound has the empirical formula CH2O and a molecular mass of 180 amu. What is the molecular formula of the compound
A player uses a hockey stick to push a puck at a constant velocity across the ice. The weight of the puck is 1.70 N. The coefficient of friction is 0.0600. With what force must the player push the puck so that his force just equals the frictional force?
Answer: The minimum force by which player should hit the puck to move it is 0.102 N.
Explanation:
Weight of the puck = 1.70 N
This weight of the puck is the force acting normal to the surface that is:
N = 1.70 N
The coefficient of friction =[tex]\mu _f=0.0600[/tex]
Frictional force = [tex]F_f=\mu _f\times N=0.0600\times 1.70 N=0.102 N[/tex]
The minimum force by which player should hit the puck to move it is 0.102 N.
Lightning is a very large flow of electrical energy. Describe the type of energy that creates the electrical energy.
A) The electrical energy comes from the thermal energy stored up in the water molecules.
B) The electrical energy comes from the gravitational potential energy of the water molecules.
C) The electrical energy comes from the chemical potential energy of the water molecules in the clouds.
D) The electrical energy comes from the attraction between charges in the cloud and the ground creating an electric potential.
During lightning, the electrical energy comes from the attraction between electrical charges in the cloud and the ground generating an electric potential. Therefore, option (D) is correct.
What is lightning?Lightning can be described as a naturally occurring electrostatic discharge in which two electrically charged regions, both in the atmosphere and the ground, temporarily neutralize themselves, causing the instantaneous release of energy.
Lightning occurs when the negative charges of electrons in the bottom of the cloud are attracted to the positive charges of the protons in the ground.
This discharge creates a wide range of electromagnetic radiation, from the heat created by the rapid movement of electrons, to brilliant flashes of visible light.
Lightning causes a sound of the shock wave which produces gases in the vicinity of the discharge experiencing an instant increase in pressure. Lightning takes place during thunderstorms as well as other kinds of energetic weather systems.
Therefore, the electrical energy during lightning produces the attraction between electrical charges in the cloud.
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In part a, you found the amount of product (3.00 mol p2o5 ) formed from the given amount of phosphorus and excess oxygen. in part b, you found the amount of product (2.60 mol p2o5 ) formed from the given amount of oxygen and excess phosphorus.now, determine how many moles of p2o5 are produced from the given amounts of phosphorus and oxygen.express your answer to three significant figures and include the appropriate units.
Answer:
The correct answer is 2.60 moles.
Explanation:
The balanced equation is:
4P + 5O₂ ⇒ 2P₂O₅
The number of moles of O₂, n = mass/molar mass
208 g / 32 g/mol = 6.5 mol
From the balanced equation,
5 moles of O₂ reacts with 2 moles of P₂O₅
So, 6.5 moles of O₂ reacts with M moles of P₂O₅
M = 6.5 × 2/5
= 2.6 moles
Therefore, the required moles of P₂O₅ are 2.60 moles.
Why carbontetra chloride exist in liquid form at room temperature?,
#1: Which of the following is a brittle solid?
A. chlorine
B. bromine
C. iodine
D. sulfur
**my answer; C. iodine
is that right?,
Which metal atom below cannot form a cation of several different charges?
How does a volcano form?
Which is the correct symbol for the atom with 42 protons and 49 neutrons?
Explanation:
Number of protons present in an atom are actually the atomic number of atom. Each element will have different atomic number.
Hence, each element is different in nature. On the other hand, atomic mass is the sum of number of protons and number of neutrons present in an element.
For example, Molybdenum is the element with 42 protons and 49 neutrons. Molybdenum is represented by the symbol Mo.
Therefore, we can conclude that Mo is the correct symbol for the atom with 42 protons and 49 neutrons.
The correct symbol for the atom with 42 protons and 49 neutrons is ^91Mo.
Atomic notation explained.
The correct symbol for the atom with 42 protons and 49 neutrons is ^91Mo.
In atomic notation, the image for an component consists of the nuclear number (number of protons) as a subscript and the mass number (entirety of protons and neutrons) as a superscript.
For the given atom with 42 protons and 49 neutrons, the overall mass number is 42 + 49 = 91. Hence, the image for this particle is ^91Mo, speaking to the component Molybdenum (Moment) with a mass number of 91.
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Why is it hard for scientists to change lead into gold?
Scientists would have to change the number of protons in lead atoms.
Scientists would have to change the number of electrons in lead atoms.
Scientists would have to change the number of neutrons in lead atoms.
Scientists would have to change the number of protons and neutrons in lead atoms.
Changing lead into gold requires changing the number of protons in the lead atoms, a process known as nuclear transmutation. This process is highly complex, energy intensive and has many potential risks, making it unfeasible as a method of gold production.
Explanation:The process of changing one element into another, such as changing lead into gold, would require the manipulation of its atomic structure. The atomic structure of an atom is primarily dictated by the number of protons it has, which determines its atomic number and essentially defines the kind of element it is. In the case of lead and gold, lead has 82 protons and gold has 79 protons.
To turn lead into gold, scientists would have to remove 3 protons from each atom, which is an incredibly difficult task. This process, known as nuclear transmutation, would require a significant amount of energy and highly advanced technology. Even then, the process is far from efficient and produces a number of problems including the release of harmful radiation and the production of unstable, radioactive isotopes.
Furthermore, changing the number of neutrons and electrons in a lead atom alone would not turn it into gold; the number of protons must be changed. So the correct statement from the options provided is that scientists would have to change the number of protons in lead atoms to transform it into gold. However, due to the immense difficulty and possible risks involved, this is not a viable option for gold production.
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what is quartz made of
Determine the number of moles of a gas which occupies 39.0mL at 27°C if the pressure is 107 kPa.
3.14 x 10-3 mol
5.52 x 10-3 mol
2.45 x 10-3 mol
1.67 x 10-3 mol
When it says Lithium crystallizes in a body centered cubic unit cell. what is the mass of one unit cell....
I did my math, but it says I have to multiply by 2. I am confused in why I have to do that?
I also have trouble understanding what is a body-centered cubic cell.
What happens to the temperature of a thermometer near an endothermic reaction?
Snow melting in sunshine is an example of which type of change
Why is oxygen called a gas. Give two reasons.,
Balance equation Al(s)+__CuSO4(aq) = ____Al2(SO4)3(aq)+____Cu(s)
If a solution containing 51.429 g of mercury(ii) perchlorate is allowed to react completely with a solution containing 16.642 g of sodium sulfate, how many grams of solid precipitate will be formed?
2H2S + 3O2 mc008-1.jpg 2SO2 + 2H2O Which option gives the correct mole ratios?
is the aswer H2S:SO2=2:2 and O2:H2O=3:2
Which scientist arranged the elements in order of increasing atomic number, rather than increasing atomic mass? Antoine Lavoisier Dmitri Mendeleev Henry Moseley John Newlands
The answer is: Henry Moseley.
Henry Gwyn Jeffreys Moseley (1887–1915) proposed that the number of positive nuclear charges (protons) in atom is equal to its atomic number in the periodic table.
Mendeleev did not know about isotopes and he arranged the elements in order of increasing relative atomic mass.
For example, positions of iodine and tellurium were reversed in Mendeleev's table, because of different isotopes, but Moseley solved anomalies like this one.
At room temperature, the surface tension of water is 72.0 mJ·m–2. What is the energy required to change a spherical drop of water with a diameter of 1.20 mm to five smaller spherical drops of equal size? The surface area of a sphere of radius r is 4π r2 and the volume is 4π r3/3.
Connect It Imagine that you can see the particles of ice, liquid water, and water vapor. Describe how these three states of water differ.
Uranium is a metallic element that is used in nuclear reactors and nuclear weapons. the vast majority of uranium found on earth is in the form of uranium-238, an isotope with a mass number of 238, while the uranium that is used for nuclear reactors and weapons is uranium-235, an isotope with a mass number of 235. what is the atomic difference between uranium-235 and uranium-238? uranium-235 has three fewer protons than uranium-238. uranium-235 has three fewer neutrons than uranium-238. uranium-235 has three fewer electrons than uranium-238. uranium-235 has three fewer atoms than uranium-238.
Answer:
U-235 and U-238 are two radioactive isotopes of Uranium. The main difference between U-235 and U-238 is that the number of neutrons present in the U-235 nucleus is 143 whereas the number of protons present in the U-238 nucleus is 146.
Explanation:
What is the pressure exerted by 3.00 mol of ar gas with a volume of 50.0 l at 25.0ºc (298.2 k)?
magnesium reacts with aluminum chloride. if you have 40g of each, how many grams of Al can you make? what is the LR? how much excess is left over after the reaction takes place
What are 3 things you can do to increase the rate of dissolving?
#1: Which of the following scientists came up with the first widely recognized atomic theory?
A. John Dalton
B. Antione Lavoisier
C. Robert Millikan
D. J.J. Thomson
***My answer: A. John Dalton
is that right??,
I need help, the longer I look at this question the more I confuse myself!!!
Consider the unbalanced equation:
HC2H3O2 (aq) +Ba(OH)2 (aq) --> H2O (l) +Ba(C2H3O2)2 (aq)
balance the equation and determine how many moles of Ba(OH)2 are required to completely neutralize 0.461 mole of HC2H3O2.