Answer:
Rs. 1.2 per mole
Explanation:
Given parameters:
Cost of NaCl = Rs. 20 per kg
Unknown:
Cost per mole = ?
Solution:
The problem here is simply to convert the unit to:
Rs. per mole
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Now, for 1kg;
Number of moles = [tex]\frac{1000}{58.5}[/tex] = 17.1moles
So;
[tex]\frac{Rs. 20}{kg}[/tex] x [tex]\frac{1kg}{17.1moles}[/tex] = Rs. 1.2 per mole
Olaf the snowman has a mass of 38 kg, and a body temperature of -4.2 degrees Celsius. He took a sip of hot coffee with a volume of 15 mL and a temperature of 80.0 degrees Celsius. The coffee turned into ice and eventually become a part of Olaf. Determine the final temperature of Olaf.
Answer:
84.2 degrees
Explanation:
Olaf the snowman has an heat capacity of ice while the coffee can be
assumed to have the same heat capacity of water.
The final temperature of ice is approximately -4.08 °CReasons:
The heat lost by the coffee = The heat gained by Olaf...(1)
ΔQ = m₁·c₁·(T₃ - T₁) = m₂·c₂·(T₂ - T₃)
Mass of the snowman, m₁ = 38 kg
Initial temperature of the snowman, T₁ = -4.2°C
Volume of coffee, V = 15 mL = 0.000015 m³
Initial temperature of the coffee = 80.0 °C
Specific heat capacity of the snowman, c₁ = 2.097 J/(g·°C)
Specific heat capacity of the coffee, c₂ = 4.187 J/(g·°C)
Latent heat of fusion of the coffee into ice = 334 J/g
Density of the ice, ρ₂ = 997 kg/m³
Solution:
Mass of the coffee, m₂ = 0.000015 m³ × 997 kg/m³ = 0.014955 kg = 14.955 grams
Heat given to convert the coffee to ice = 334 J/g × 14.955 g = 4,994.97 J
Heat given to cool the coffee to 0°C = 14.955×4.187×80.0 = 5009.3268
Heat given to cool the coffee to 0°C = 5,009.3268 J
Heat given to reduce the temperature of the coffee turned to ice is
presented as follows;
Heat to cool frozen coffee = 14.955 × 2.108 × T₃ = 31.52514·T₃
Heat gained by Olaf = m₁·c₁·(T₃ - T₁) = 38,000× 2.097 × (T₃ - (-4.2))
Which from equation (1) gives
4,994.97 + 5009.3268 + 31.52514·T₃ = 38,000× 2.097 × (T₃ - (-4.2))
Solving with a graphing calculator, gives;
T₃ ≈ -4.08 °C
The final temperature of Olaf, T₃ ≈ -4.08 °C
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Read the passage and examine the photos. Then, suggest two reasons that scientists think developing pollen grains made vascular plants the most successful plants that live on land.
Passage
These mosses are nonvascular plants that grow closely packed together in moist places. The sperm they produce for sexual reproduction must swim to a nearby plant that has an egg that the sperm may fertilize.
Seed plants, such as these conifers, are vascular plants that live in both moist and dry places. For sexual reproduction, conifers produce pollen grains that contain sperm that cannot swim. Conifers produce massive amounts of pollen grains that can be carried by wind.
Answer:
Vascular plants are successful due to better transportation for water, nutrients and reproduction.
Explanation:
I got it right at school and hope this helps you learn to STUDY.jk
According to scientists, the evolution of pollinators made vascular plants the most successful land plants for two major reasons:
Sperm can be more effectively and widely distributed for sexual reproduction, thanks to pollen grains.Vascular plants can reproduce without the need for a moist environment because they can make pollen grains.What are Pollen grains?Plants with seeds, including flowering plants and conifers, produce pollen grains as a component of their reproductive process. They are often carried by wind or pollinators, such as bees, to the female reproductive organs of the same or different plant species, where they can fertilize female gametes (egg cells) and begin the development of seeds.
They carry the male gametes (sperm cells) of the plant. Many plant species depend on pollen grains for successful reproduction, and these grains have evolved a variety of forms, sizes, and surface features that make them easier to disperse and be recognized by pollinators.
Therefore, according to scientists, the evolution of pollinators made vascular plants the most successful land plants for two major reasons:
Sperm can be more effectively and widely distributed for sexual reproduction, thanks to pollen grains.Vascular plants can reproduce without the need for a moist environment because they can make pollen grains.Learn more about Pollen grains, here:
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PLEASE HELPP hurryyyy
Answer:
A
Explanation:
why do you think you can find silver and gold on their own in rocks but calcium and magnesium are combined with other elements to make compounds such as calcium carbonate and magnesium sulfate?
Explanation:
Silver and Gold belong to a special group of metals known as the native metals. They are found naturally on their own and not in combined form in rocks.
These metals are found uncombined because they are unreactive. They prefer to alloy with themselves. Calcium and magnesium on the other hand are reactive metals. The unreactivity of these metals makes them uncombined in nature.ihsusbydnuhzkuhd nuziw
What is the area on the earth's surface directly above where an earthquake originates?
Answer:
The epicenter
How do the products of chemical reactions compare to their reactants? Question 5 options: The products usually weigh more than the reactants. The products often have completely different properties than the reactants. The products usually have more atoms than the reactants. The products are usually more toxic than the reactants.
Answer:
The products often have completely different properties than the reactants.
Explanation:
In a chemical reaction, the products are often completely different from the reactants.
When chemical reactions takes place, the species rearranges to form new bonds and to attain stability.
Therefore, the new products formed usually have completely different properties when compared to the reactants.
Also, in chemical reactions, mass is always conserved. The mass of the products and reactants are usually the same.
Do Compounds always have the same physical properties as the elements they are made of
Answer:
No
Explanation:
The physical and chemical properties of substances are usually difference from those of the elements that makes them up.
Compounds are substances composed of two or more kinds of atoms joined together in a definite grouping.
The properties of a compound are distinct and different from those of the individual elements that are combined in its make-up.
Karsten performed a scientific study on the way that a certain chemical affects ecosystems. After Karsten published his results, one of his peers said that Karsten's conclusion was influenced by selection bias. What did Karsten's peer mean by this statement?
A.
Karsten did not choose the correct topic to study.
B.
Karsten did not spend enough time studying the chemical.
C.
Karsten's data did not support his published conclusion.
D.
Karsten's results could have been different in other ecosystems.
Answer:
C
Explanation:
There are eight markers in a full set, but Flora and Frank each only have seven markers. Flora is missing the red marker, and Frank is missing the blue marker.
What can they do so that each has a full set of markers?
Answer:
Put their markers together, now they have each color
Explanation:
Answer:
They should share the colors that they are missing
Explanation:
That way, they would both have each color
What does an atomic number represent in an atom? number of neutrons number of protons number of electrons number of protons and neutrons
Answer:
The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.
Answer: I'm pretty sure the answer is Number of Protons
Explanation:
I took the k-12 test
The first noble gas with a Lewis Structure with 8 dots is
A. Ar
B. Kr
C. He
D. ne
Answer:
C) He
Explanation:
Helium is one of the noble gases and contains a full valence shell. Unlike the other noble gases in Group 8, Helium only contains two valence electrons.
What is the density of a plastic ball that has a volume of 6cm3 and a mass of 12g?
Answer:
The answer is 2 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{12}{6} \\ [/tex]
We have the final answer as
2 g/cm³Hope this helps you
Which of the following might be included in a chemical
reaction?
a Molecules
b lons
C Pure elements
d All of the above
Answer:
D. All of the above
Explanation:
Molecules, ions, and pure elements might be included in a chemical reaction. Therefore, option (d) is correct.
What is a chemical reaction?A chemical reaction can be described as a reaction that brings the chemical conversion of one chemical substance to another chemical substance. The reactions cause chemical changes that include the rearrangement of electrons in order to create and break bonds between atoms.
The compound or molecules which are primarily utilized in a reaction are called reactants. Chemical reactions give products, which possess characteristics different from the reactants of the reaction.
Chemical reactions take place at a definite rate of reaction at a given concentration, temperature, and pressure. The rate of reaction increases with the rising temperature of the reaction as more activation energy is available for reactant molcules collisions.
Therefore, in a chemical reaction reactants and products can be present as Molecules, ions, and pure elements.
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The cardiovascular and respiratory systems interact to
A. send and receive messages to and from all parts of the body.
B. digest and transport food to cells in all parts of the body.
C. transport and exchange gases needed by cells in all parts of the body.
D. sense and react to changes in the environment.
Answer:
c
Explanation:
7th grade help me plzzzzzzzzzz
The diagram below shows what happens to an atom of uranium-235 when bombarded by a neutron. Which isotope is represented by X in the diagram?
Answer:
X represents barium - 141 nucleus.
Written as: (141, 56) Ba
Explanation:
In nuclear fission reaction, due to the fact that the process produces more neutrons, a nuclear chain reaction can possibly occurr. Now, a chain reaction is a one whereby the material that begins the reaction will also be one of the products and it can start another reaction.
Now, for the nuclear chain reaction for the fission of uranium-235, its nucleus absorbs a neutron after which it splits into a krypton - 92 nucleus and a barium - 141 nucleus. Thereafter it releases three more neutrons.
Thus, X is the image represents barium - 141 nucleus.
(141,56) Ba
What is the opposite force to pushing off the ground to jump?
Answer:
Newton's Third Law of Motion states that to every action there is an equal and opposite reaction. When the earth pushes on you to send you into the air after jumping, you also push on the earth with the same force. But forces are different from accelerations. A force F is a push or pull on an object
Explanation:
Answer:
Friction
Explanation:
Friction causes an opposite force
There are 70 fisherman and 5 sea bass in the lake. Are sea bass considered a limiting factor?
Answer:
yes
Explanation:
Using the three words below (cell wall, cell membrane and animal cell) construct your own sentence using what you have learned about plant and animal cells. PLEASE HELP ME IT WILL BE
Answer:
Explanation:
Both eukaryotic and prokaryotic cells have a cell membrane, which defines the limit between the environment surrounding the cell and the cell itself.
Eukaryotic cells can be either animal cells or plant cells. Plant cells, apart from the membrane, are surrounded by a cell wall that is thick and conformed by carbohydrates and peptides. This cell wall makes the cell resistant and gives it its shape. Animal cells, on the other hand, do not have cell walls, they only have the cell membrane, that regulates the entrance of nutrients and the exit of metabolic products.
a snail slowly moves along at 3 ft/hr. what type motion velocity ,distance, speed acceleration displacement Please answer need it now!!!!!
Answer:
motion - forward
velocity - 3ft/hr
distance - 3 ft/hr
speed - 3 ft/hr
acceleration - none
displacement - ?????
Explanation:
WILL GIVE POINTS AND BRAINLIEST
Question:
Number of H− ions in 5.22 g of SrH2
Answer:
moles H = 2 x 0.0649=0.130
ions = 0.130 x 6.02 x 10^23=7.81 x 10^22
Explanation:
The end result of ecological succession is called?
1.) Primary Ecosystem
2.) Secondary Ecosystem
3.) Climax Community
4.) none of these
what is the temperature of the liquid at vaporization (boiling/condensing)?
Help! I am in a hurry! Will get brainliest if correct!
Answer:
Should be 3
Iron, cobalt, and nickel
Element X reacts with chlorine to form an ionic compound that has the formula XCl₂. To which group on the Periodic Table could element X belong?
Answer:
Group 2 is the correct answer.
Explanation:
Chlorine has a charge -1. It means that X is +2 so that the formula is XCl2.
Salt is a common example of a(n) _____________ bond, while Water is a common example of a(n) _____________ bond.
Answer:
salt is ionic bond and water is Polar covalent bond
Explanation:
what phenomenon occurs after mass extinction?
Answer:
Diversification and adaptive radiation.
Explanation:
What will most likely happen if you place a piece of metal in a base?
O A. The metal will turn into a salt.
O B. The metal will neutralize the base.
C. The metal will give off a gas.
O D. The metal will not react with the base.
Answer:D
Explanation:
The metal will not react
Which statement correctly describes protons and neutrons? *
O They have the same mass and the same electrical charge.
They have different masses but the same electrical charge.
O They have different masses and different electrical charges.
They have the same mass but different electrical charges.
Answer:
They have the same mass but different electrical charges.
Explanation:
Protons have a positive charge while neutrons have a neutral charge. Although they have different charges, they have the same amount of mass.
The protons and neutrons have the same mass but different electrical charges. THerefore, option (D) is correct.
What is a proton?A proton is described as a stable subatomic particle, a chemical symbol with +1e elementary charge. The mass of the proton is approximately equal to the mass of the neutron but 1836 times the mass of an electron.
Protons and neutrons are jointly together termed "nucleons" each with masses of approximately one atomic mass unit (a.m.u.). There will be one or more than one proton present in the nucleus of an atom. There is an attractive electrostatic central force that holds the atomic electrons.
The number of protons in the atom is referred to as the atomic number and is expressed by the symbol Z. Since each element in the periodic table has a unique number of protons, determines the chemical characteristics of the element.
As the neutrons present in the nucleus of an atom are neutral and do not carry any charge while the protons are positively charged.
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What type of bond (Ionic, Covalent or Metallic) would be created when carbon bonds with bromine?
Answer:
Covalent bond
Explanation:
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