Hey there!
Consider 100 g of solution:
Mass of NaCl = 3.50% of mass of seawater
( 3.50 / 100 ) * 100 => 3.50 g
Number of moles as shown below:
Molar mass NaCl = 58.44 g/mol
n = Mass / molar mass
n = 3.50 / 58.44 => 0.059 moles of NaCl
Mass of sweater:
Mass of solution - Mass of NaCl
100 - 3.50 = 96.5 g
96.5 g in Kg :
96.5 / 1000 => 0.0965 Kg
Therefore ,calculate molality by using the following formula:
molality = number of moles of solute / mass of solution
molality = 0.059 / 0.0965
molality = 0.61 m
Hope That helps!
How many neutrons are there in one atom of 107 Ag(silver-107)
A. 28
B. 47
C. 60
D. 79
Answer:
[tex]60[/tex]
Answer C is correct
Explanation:
Silver has 47 electrons and 47 protons.
So,
[tex]mass \: \: number = protons + neutrons \\ \: \: \: \: \: \: \: \: \: \: \: \: \: 107 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \: \: \: \: \: \: \: \: 47 \: \: \: \: \: \: \: \: \: + \: \: \: \: \: \: \: \: \: \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: x \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \: \: \: \: \: \: \: 107 - 47 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: x \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \: \: \: \: 60[/tex]
What is saponification
Saponification is a process that involves conversion of fat or oil into soap and alcohol by the action of heat in the presence of aqueous alkali
aluminum, sulfur, and chlorine are elements found on the periodic table. tests involving these three elements would show that at normal room temperature
Answer is: aluminum is malleable and conducts electricity.
Mallebility is the property or ability of the metal to be hammered or pressed into shape without breaking or cracking.
Aluminium (Al) is metal, sulfur (s) and chlorine (Cl) are nonmetals.
Metals conduct electricity because of the metallic bond, sulfur and chlorine can not conduct electricity because they are nonpolar compounds.
Metallic bond is formed between electrons and positively charged metal ions
Answer:
aluminum is malleable and conducts electricity.
Explanation:
what is the heaviest element that can be formed in the stars
The Heaviest element is helium
The atmosphere protects us from all of the following except (4 points)
Global warming, Cosmic Background radiation (even though most is blocked not ALL), and pollution.
The ethic of sustainable development has evolved with a view to _____.
Compare a cup of hot coffee with the Pacific Ocean. Which statement about thermal energy and temperature is correct?
A. Water in the Pacific Ocean has more thermal energy and a higher temperature.
B. Water in the Pacific Ocean has less thermal energy and a lower temperature.
C. Water in the Pacific Ocean has less thermal energy and a higher temperature
D. Water in the Pacific Ocean has more thermal energy and a lower temperature.
Answer:
The correct answer is option D, that is, water in the Pacific Ocean has more thermal energy and a lower temperature.
Explanation:
The water present in the Pacific Ocean exhibits lower temperature and more thermal energy. This is due to the fact that the Pacific Ocean comprises more molecules, which signifies that it possesses more kinetic energy that produces more thermal energy. As a cup of coffee possesses fewer molecules, thus, the molecules will travel faster and its temperature will be more.
Cell division allows organisms to grow,repair damaged structures,and produce energy. True or false
Cell division allows organisms to grow and repair damaged tissues. But it does not assist in energy production, which is performed by mitochondria through cellular respiration.
Explanation:The statement is partially true and partially false. Cell division, indeed, allows organisms to grow and repair damaged structures. This occurs as the original one cell replicates itself multiple times to form the complex multicellular organism. Even after the organism is fully grown, new cells are continuously produced for maintenance and repair purposes, for instance, blood and skin cells. However, the part of the statement that says cell division helps organisms produce energy is false. Energy production in cells is actually a function of the mitochondria in a process known as cellular respiration, not cell division.
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Two masses exerting a force on each other is an example of________ A.) Kepler's law B.)Heliocentric theory C.)Universal law of gravitation D.)Geocentric theory
It would be C. Have a great day!
Which of the following is the electron configuration of an electrically neutral atom of argon (Ar)?
(a) 1s² 2s² 2p5
(b) 1s² 3d¹⁰ 4f⁷
(c) 1s² 2s² 2p⁶ 3s² 3s⁶
(d) 1s² 2s1
Answer:
The correct electron configuration for an electrically neutral atom of argon (Ar) is:
Explanation:
(c) 1s² 2s² 2p⁶ 3s² 3p⁶.
The electron configuration of an electrically neutral atom of argon (Ar) is 1s² 2s² 2p⁶ 3s² 3p⁶.
Explanation:The electron configuration of an electrically neutral atom of argon (Ar) is 1s² 2s² 2p⁶ 3s² 3p⁶. This configuration represents the arrangement of electrons in different energy levels and orbitals of an atom. The numbers and letters in the configuration represent the energy level (n) and the type of orbital (s, p). In this case, argon has two electrons in the 1s orbital, two electrons in the 2s orbital, six electrons in the 2p orbital, two electrons in the 3s orbital, and six electrons in the 3p orbital.
Which element has an electron configuration of [Kr]5s2?
Answer:
Strontium
Explanation:
Strontium is a silvery-white, soft metal, good conductor of electricity. When exposed to air, it oxidizes quickly and therefore must be stored in kerosene. Upon combustion in the air, it produces a bright light and forms the oxide and the nitride of strontium. It reacts with water and from this process is formed the strontium hydroxide and released the molecular hydrogen.
It is an abundant element in nature: it is present, in the form of strontium compounds, in magmatic rocks. It is not found in its metallic form, but especially in the form of strontium sulphate.
Symbol: Sr Electrons per layer: 2,8,18,8,2 Atomic number: 38 Atomic mass: 87.62 Electronic configuration: [Kr] 5s2 Chemical series: Metal, alkaline earth metal, Element of the 5th Periodis straining cooked pasta from water a physical or chemical separation
Straining cooked pasta from water is a physical separation. This is because the pasta (solid) and water (liquid) are separated based on their physical states, and no new substances are formed.
Explanation:Straining cooked pasta from water is considered a physical separation process, not a chemical separation. In a physical separation, substances are separated based on their physical properties - in this case, the solid pasta and the liquid water. No new substances are created in this process, which is a key characteristic of physical separations. Conversely, a chemical separation involves a chemical reaction and changes in the identity of the substances involved, which does not occur when straining pasta.
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Planets appear to move in the sky against the backdrop of the ____ . other planets B. the stars C. the sun D. the moon
I would say B. the stars
This is because you don't see stars move. For example, when you look at the moon, do you see the stars move while the moon sits in place? No right. So, your answer would be B. Hope this helps!
Question
Planets appear to move in the sky against the backdrop of the ____ . other planets B. the stars C. the sun D. the moon
Answer:
The stars
Hope this helps!
What kind of chemist studies chemical reactions involved in photosynthesis the process that plants use to make food?
Answer;
-Biochemist
Explanation;
Biochemistry is the study of the chemical reactions that take place within living cells. These includes photosynthesis in plants, thus a biochemist studies chemical reactions involving photosynthesis.
Photosynthesis is the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
which is the least reliable method for identifying a mineral
Color of mineral is the least reliable method for identifying a mineral.
Explanation:The same mineral can come in a variety of colors and different minerals can be the same color. The color can change over time do to weathering. Color of a mineral is easily observed as it does not need specific methodology.Color identification can be done by simple observation.It's color, my son got this one right.
The percent abundance of each isotope tells you how many of each kind of isotope exist in every 100 particles. What does relative abundance tell you?
Answer:
The answer is Relative plenitude alludes to the amount of a specific isotope is available in a given measure of test.
Explanation:
The 'relative plenitude' of an isotope implies the level of that specific isotope that happens in nature. Most components are comprised of a blend of isotopes. The total of the rates of the particular isotopes must indicate 100%. The relative nuclear mass is the weighted normal of the isotopic masses. The percent plenitude of every sort of sweets reveals to you what number of every sort of Aufbau there are in each 100 CANDIES. Percent wealth is additionally relative plenitude. This is only a method for giving us a photo on which kind exists all the more every now and again.
Relative abundance refers to the ratio or proportion of a particular isotope out of all isotopes of the same element present in a sample. This concept is used when determining the average atomic mass of an element.
Explanation:Relative abundance in the context of isotopes refers to the proportion of a particular isotope compared to all of the isotopes present in a sample. While percent abundance states how many of each kind of isotope exist in every 100 particles, relative abundance specifies the ratio or portion of one isotope to the total isotopes of the same element. This is applied when we determine the average atomic mass of an element as depicted in the Periodic Table, where the relative abundance plays an important role.
Isotopes of an element are atoms with the same atomic number but different mass numbers, therefore, they only differ in the number of neutrons within the nucleus. When a naturally occurring element is composed of several isotopes, the atomic mass of the element represents the average of the masses of the isotopes involved, weighted by their relative abundance. For instance, Carbon-12 (with 6 protons and 6 neutrons) and Carbon-13 (with 6 protons and 7 neutrons) are isotopes of Carbon. If in a sample, Carbon-12 represents 99% and Carbon-13 represents 1%, the relative abundance will influence the average atomic mass towards the mass of Carbon-12.
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what happens to the kinetic energy of a meteoroid as it travels farther through the atmosphere to earths surface
The kinetic energy of a meteor decreases as it travels through the atmosphere.
Friction with molecules in the atmosphere causes the meteor to slow down and lose kinetic energy.
The lost kinetic energy is converted into heat, which causes the glow along the meteor’s trail.
which of the following is more electronegative:
1) CF3
2) CH3
please provide some explanation, thanks
Final answer:
The group CF3 is more electronegative than CH3 due to the presence of fluorine atoms, which have a significantly higher electronegativity (4.0) compared to the electronegativity of hydrogen atoms (2.1) in CH3.
Explanation:
To determine which of the two groups - CF3 or CH3 - is more electronegative, we should consider the electronegativity of the atoms involved. In CF3, the fluorine atoms have an electronegativity of 4.0, which makes them significantly more electronegative than carbon, which has an electronegativity of 2.5. In contrast, in CH3, the hydrogen atoms have an electronegativity of 2.1, which is closer to that of carbon, resulting in less polarization than in CF3.
Based on the individual electronegativities of fluorine and hydrogen, and knowing that fluorine is much more electronegative than carbon, the CF3 group is more electronegative than the CH3 group. This is because the presence of fluorine atoms, which can better stabilize a negative charge, leads to a greater tendency for polarization and creating a strong dipole moment in compounds they are part of.
6. This part of Earth's atmosphere blocks the sun's harmful rays. (4 points)
Answer:
stratosphere Here you go
Explanation:
what is alchemy? is it magic? is it.. weird chemistry or science?
Alchemy is the equivalent to (equal to) Midevil Chemistry.
Alchemy is the predecessor of modern chemistry, where alchemists attempted to transmute common substances into valuable ones like gold. It was not considered scientific by modern standards.
Explanation:Alchemy is not magic, but rather a precursor to modern chemistry. It was a practice that originated hundreds of years ago, in which alchemists attempted to transmute common substances into valuable ones, such as turning lead into gold. While alchemy made some useful contributions to the understanding of how to manipulate matter, it was not considered scientific by modern standards. Eventually, alchemy faded and the science of chemistry emerged.
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make a claim about copper and silver based on their position relative to each other
Which pair shares the same empirical formula?
1. C2H4 and C6H6
2. CH2 and CH4
3.CH3 and C2H6
4. CH and C2H4
Answer:- 3. [tex]CH_3[/tex] and [tex]C_2H_6[/tex]
Explanations:- An empirical formula is the simplest whole number ratio of atoms of each element present in the molecule/compound.
For example, the molecular formula of benzene is [tex]C_6H_6[/tex] . The ratio of C to H in it is 6:6 that could be simplified to 1:1. So, an empirical formula of benzene is CH.
In the first pair, the ratio of C to H in first molecule is 2:4 that could be simplified to 1:2 and the empirical formula is [tex]CH_2[/tex] . In second molecule the ratio of C to H is 6:6 and it could be simplified to 1:1. and the empirical formula is CH. Empirical formulas are different for both the molecules of first pair and so it is not the right choice.
In second pair, C to H ratio in first molecule is 1:2, so the empirical formula is [tex]CH_2[/tex] . The C to H ratio for second molecule is 1:4, so the empirical formula is [tex]CH_4[/tex] . Here also, the empirical formulas are not same and hence it is also not the right choice.
In third pair, C to H ratio in first molecule is 1:3, so the empirical formula is [tex]CH_3[/tex] . In second molecule the C to H ratio is 2:6 and it is simplified to 1:3. So, the empirical formula for this one is also [tex]CH_3[/tex] . Hence. this is the correct choice.
In fourth pair, first molecule empirical formula is CH. Second molecule has 2:4 that is 1:2 mole ratio of C to H and so its empirical formula is [tex]CH_2[/tex] . As the empirical formulas are different, it is not the right choice.
So, the only and only correct pair is the third one. 3. [tex]CH_3[/tex] and [tex]C_2H_6[/tex]
How is the nucleus of an atom split?
radioactive decay
chemical reaction
collision of atoms
collision with a high-speed particle
Answer:
D. Collision with a high-speed particle.
Explanation:
During a process called nuclear fission, some nuclei can be hit by fast-moving atomic particles and thus can be broken down into smaller nuclei. Energy is given off in this process, which is the basis for nuclear power plants.
you are planning an experiment to find whether the rate at which water freezes depends on the shape of its container. identify the manipulate variable in the responding variable. list the other variables you would control.
In the experiment, the manipulated variable is the shape of the container and the responding variable is the rate at which water freezes. Controlled variables could include the start temperature of the water, the volume of water in each container, and the freezer temperature.
Explanation:In the experiment to test whether the rate at which water freezes depends on the shape of its container, the manipulated variable, or independent variable, is the shape of the container. This is what you will change during the experiment. The responding variable, or dependent variable, is the rate at which water freezes. This is what you're measuring.
The other variables you would control (known as controlled variables) to ensure a fair test include the start temperature of the water, the volume of water in each container, and the freezer temperature, among others. By keeping these variables constant, it ensures that any difference in freezing rates is due to the shape of the container only.
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When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced.
2Al(s)+6HCL(aq)->2AlCl3(aq) +3H2(g)
What mass of Al(s) is required to produce 513.0 mL of H2(g) at STP?
To produce 513.0 mL of hydrogen gas at STP, approximately 0.413 g of aluminum is required.
Explanation:To determine the required to produce 513.0 mL of hydrogen gas at STP, we need to use stoichiometry. From the balanced chemical equation, we can see that 2 moles of aluminum react to produce 3 moles of hydrogen gas. Using the molar volume mass of aluminum of a gas at STP (22.4 L/mol), we can calculate the number of moles of hydrogen gas produced. Then, using the molar mass of aluminum (26.98 g/mol), we can find the mass of aluminum needed.
First, convert the volume of hydrogen gas to moles using the molar volume:
(513.0 mL / 1000 mL/L) × (1 L / 22.4 L/mol) = 0.0229 mol H₂
Since the molar ratio of aluminum to hydrogen gas is 2:3, divide the number of moles of hydrogen gas by 3 and multiply by 2 to find the moles of aluminum:
0.0229 mol H₂ × (2 mol Al / 3 mol H₂) = 0.0153 mol Al
Finally, multiply the moles of aluminum by the molar mass of aluminum to find the mass:
0.0153 mol Al × 26.98 g/mol = 0.413 g Al
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To find the mass of Al required to produce 513.0 mL of H2 gas, convert the given volume of gas to moles (at STP, 1 mole = 22.4 L), use the stoichiometry of the reaction to find the corresponding moles of Al, and then multiply by Al's molar mass.
Explanation:The question is asking for the mass of Aluminum (Al) that is required to produce a specific volume of Hydrogen gas (H2) based on the reaction provided. According to the stoichiometry of the reaction, 2 moles of Al are required to produce 3 moles of H2 gas. At Standard Temperature and Pressure (STP), 1 mole of any gas occupies 22.4 liters. Thus, to find the volume of hydrogen, we convert the given volume from milliliters to liters (513.0 mL is 0.513 Liters) and divide it by 22.4 L/mol to find the moles of hydrogen.
From this stoichiometry, we then find the corresponding moles of Al (2/3 of the moles of H2) and multiply this by the molar mass of Al (approximately 26.98 g/mol) to find the mass of Aluminum needed.
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What are some real life examples of chloroplast?
Chloroplasts, found in plants and green algae, perform photosynthesis, creating glucose from sunlight, water, and carbon dioxide. All green parts of a plant, like tree leaves, contain chloroplasts. Algae and some non-photosynthetic organisms like certain sea slugs also have chloroplasts.
Explanation:Chloroplasts are essential components of plants and green algae, carrying out the process of photosynthesis which converts sunlight, water, and carbon dioxide into organic compounds, the most significant of which is glucose. In terms of real life examples of chloroplasts, they are found in all green parts of a plant. For instance, the leaves of a tree are green because of the presence of chloroplasts.
Another example would be algae, both single-celled and multicellular forms. Some non-photosynthetic organisms also contain chloroplasts, having acquired them from endosymbiotic relationships with photosynthetic organisms; an example is the sea slug Elysia chlorotica.
In conclusion, any organism performing photosynthesis, from your backyard plant to green sea slug, contains chloroplasts.
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What is another name of the activation energy barrier in a reaction?
Answer:
Another name of activation energy is "Needed energy" .
Explanation:
Activation energy can be imagined of as the measurement of the potential barrier (seldom described the energy barrier) distributing minima of the potential energy surface concerning the initial and ultimate thermodynamic phase. For a chemical reaction or distribution to advance at a reasonable rate, the specific temperature of the operation should be high satisfactory so that there subsists an apparent number of particles with translational energy equivalent to or higher than the activation energy. The word Activation Energy was founded in 1889 by the Swedish expert Svante Arrhenius.
The equal areas law is Keplers 2nd law of motion of planetary motion. It states that _____
An imaginary line joining a planet and the sun sweeps out an equal area of space in equal amounts of time. Thus, the speed of the planet increases as it nears the sun and decreases as it recedes from the sun.
Answer: It states that a line joining a planet and the sun sweeps an equal area in equal time, moving along its orbit.
Explanation: It tells us about the speed of a planet revolving around the sun in an elliptical orbit. The speed of the planet varies inversely to the distance, when the planet is closer speed is high and speed is low when it recedes from the sun. The rate at which area is being swept out is constant ,that is 'equal area in equal time'.
How many polar bonds are found in this molecule
What is the theoretical yield of N2O5 when 28.0 g of N2 reacts with 68.0 g of O2 in the following equation? 2 N2 + 5 O2 → 2 N2O5
The theoretical yield of N₂O₅ is 91.8 g.
We have the masses of two reactants, so this is a limiting reactant problem.
We know that we will need a balanced equation with masses, moles, and molar masses of the compounds involved.
Step 1. Gather all the information in one place with molar masses above the formulas and masses below them.
M_r: 28.01 32.00 108.01
2N₂ + 5O₂ ⟶ 2N₂O₅
Mass/g: 28.0 68.0
Step 2. Calculate the moles of each reactant
Moles of N₂ = 28.0 g N₂ × (1 mol N₂/28.01 g N₂) = 0.9996 mol N₂
Moles of O₂ = 68.0g O₂ × (1 mol O₂/32.00 g O₂) = 2.125 mol O₂
Step 3. Identify the limiting reactant
Calculate the moles of N₂O₅ we can obtain from each reactant.
From N₂: Moles of N₂O₅ = 0.9996mol N₂ × (2 mol N₂O₅/2 mol N₂) = 0.9996 mol N₂O₅
From O₂: Moles of N₂O₅ = 2.125 mol O₂ × (2 mol N₂O₅/5 mol O₂) = 0.8500 mol N₂O₅
The limiting reactant is the one that gives the smaller amount of N₂O₅.
Step 4. Calculate the theoretical yield of N₂O₅.
Mass of N₂O₅ = 0.8500 mol N₂O₅ × (108.01 g N₂O₅/1 mol N₂O₅) = 91.8 g N₂O₅
The theoretical yield is 90.7 g.
We know that;
Number of moles of N2= 28.0 g/28 g/mol = 1 moles
Number of moles of oxygen = 68.0 g/32 g/mol = 2.1 moles
From the reaction equation;
2 N2 + 5 O2 → 2 N2O5
2 moles of N2 reacts with 5 moles of O2
1 mole of N2 reacts with 5 × 1/2 = 2.5 moles of O2
This implies that O2 is the limiting reactant.
5 moles of O2 yields 2 moles of N2O5
2.1 moles of O2 yields 2.1 × 2/5 = 0.84 moles
Theoretical yield of N2O5 = 0.84 moles × 108 g/mol = 90.7 g
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