Answer:
Sample Response: Surface tension is the result of water molecules pulling inward with a strong attractive force. This attractive force brings the molecules on the surface of the water close together and causes the surface of the water to be drawn toward the water molecules beneath the surface. Since there are no water molecules above the surface, there are uneven forces. This causes surface tension, allowing the needle to float on the water’s surface.
Explanation:
A compound known to contain only molybdenum (Mo) and oxygen (O) is found to be 67% molybdenum by mass What is the empirical formula of the compound?
Final answer:
The empirical formula is [tex]MoO_3[/tex].
Explanation:
To determine the empirical formula of a compound that is 67% molybdenum (Mo) and 33% oxygen (O) by mass, we follow these steps:
Convert the percentages to grams. Assuming a 100 g sample, we have 67 g of Mo and 33 g of O.Convert the masses to moles by dividing by the atomic mass (95.94 g/mol for Mo and 16.00 g/mol for O).[tex]\frac{67 g Mo}{95.94 g/mol}[/tex] = 0.699 moles of Mo[tex]\frac{33 g O}{16.00 g/mol}[/tex] = 2.0625 moles of ODivide the moles of each element by the smallest number of moles to find the simplest whole number ratio.[tex]\frac{0.699 moles Mo}{0.699}[/tex] = 1 mole of Mo[tex]\frac{2.0625 moles O}{0.699}[/tex] = 2.95, which we round to 3 moles of OIf the ratio of moles of O to Mo is not a whole number, we may need to multiply by a small integer to achieve a whole number ratio.
The empirical formula of the compound is [tex]MoO_3[/tex].
During a chemical reaction, an iron atom became the ion Fe2+. What happened to the iron atom?
The Iron atom got oxidized.
Explanation:In inorganic chemistry Oxidation and Reduction reactions are defined as,
Reduction:
The reaction in which an atom accepts electrons is known as reduction reaction.
Example:
2 Na + Cl₂ → 2 NaCl
In this reaction Chlorine oxidation state has changed from 0 to -1. Hence, it has gained one electrons therefore, it is designated as being reduced.
Oxidation:
The reaction in which an atom looses electrons is known as reduction reaction.
Examples:
2 Na + Cl₂ → 2 NaCl
In this reaction Sodium's oxidation state has changed from 0 to +1. Hence, it has lost one electrons therefore, it is designated as being Oxidized.
2 Fe + 3 O₂ → 2 FeO
In this reaction Iron's oxidation state has changed from 0 to +2. Hence, it has lost two electrons therefore, it is designated as being Oxidized.
explain why metals are good conductors of electric current.
Metals are good conductors because the molecules that are inside the metal are tightly packed together. This is why the heat moves through the metal quickly.
which correct answer is it?
Can someone plz help me with these 5 questions!! Will give brainliest for right answers!! Thanks!!
1. The Hertzsprung-Russell diagram below shows how the brightness, surface temperature, and color of stars are related.stars would be
A. Barnard’s Star is less bright than the sun, has a surface temperature below 3,800 K, and is red.
B. Barnard’s Star is less bright than the sun, has a surface temperature above 3,800K, and is red.
C. Barnard’s Star is brighter than the sun, has a surface temperature below 5,300 K, and is yellow.
D. Barnard’s Star is brighter than the sun, has a surface temperature above 5,300 K, and is yellow.
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2. The Milky Way galaxy is described as a disk of stars orbiting a central point on the disk. Which of these best explains why people on Earth cannot see the entire shape of the Milky Way?
A. Earth is a part of this galaxy.
B. Many more stars exist outside the galaxy.
C. The stars in the center of the galaxy are extremely small.
D. The center of the galaxy consists of a dense cluster of stars.
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3. A student learns that the sun is classified as a medium-size star and that many stars are much bigger and brighter. However, the student observes that other stars look very dim, even through a telescope.Why do other stars look much dimmer than the sun?
A. The sun appears yellow, which is more visible than other colors.
B. The sun is much closer to Earth than other stars are.
C. Other stars are made up of different gases than the sun is.
D. As light from other stars travels through space, it gets reflected.
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4. The sun is a mid-sized, main sequence star. What stage is next in the life cycle of the sun?
A. red giant
B. black hole
C. white dwarf
D. neutron star
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5. In November 2013 an object orbiting the sun seemed to disappear behind the sun. When a satellite did not detect the object, astronomers thought that the object had been destroyed when it passed close to the sun. However, when another satellite detected a small, bright object with a fan-shaped tail, astronomers proposed that the object was not destroyed.What type of object were astronomers most likely observing?
A. A comet
B. An asteroid
C. A meteor
D. A nebula
Correct answer is A
A. Barnard’s Star is less bright than the sun, has a surface temperature below 3,800 K, and is red.
Explanation:The below Hertzsprung Russell diagram abbreviated H–R diagram, or HRD is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.
Answer 2:Correct option is A
A. Earth is a part of this galaxy.
Explanation:The Milky Way galaxy is described as a disk of stars orbiting a central point on the disk. The Milky Way is the galaxy that contains our Solar System. The word "milky" is derived from the galaxy's appearance from Earth: a band of light seen in the night sky formed from stars that cannot be individually detected by the naked eye.
Answer 3:Option B is correct.
B. The sun is much closer to Earth than other stars are.
Explanation:Sun is classified as a medium-size star and that many stars are much bigger and brighter because Sun is far more near to the earth as compared to other stars. Other stars are thousands of galaxy years far from earth.
Answer 4:Option A is correct.
A. red giant
Explanation:Sun is a sphere-shaped star made up of hot plasma, with an internal convective motion that creates a magnetic field via a dynamic process. It is the most important source of energy for life on Earth.
Answer 5:Option A is correct.
A. A comet
Explanation:In November 2013 an object orbiting the sun seemed to disappear behind the sun. When a satellite did not detect the object, astronomers thought that the object had been destroyed when it passed close to the sun. However, when another satellite detected a small, bright object with a fan-shaped tail, astronomers proposed that the object was not destroyed. After that it was concluded as a comet.
A comet is an icy tiny Solar System body. When it passes near the sun it gets warmer This produces an apparent atmosphere or coma, and sometimes also leave a tail.
Solar system consists of the Sun and other that are bound to it by gravity
and a the same time orbit around it.
The following are answers to the questions :
Barnard’s Star is less bright than the sun, has a surface temperature below 3,800 K, and is red.Earth is a part of this galaxy best explains why people on Earth cannot see the entire shape of the Milky Way.Other stars look much dimmer than the sun because the sun is much closer to Earth than other stars are.Red giant stage is next in the life cycle of the sun.Comet is the type of object were astronomers most likely observing.Read more about Solar system here https://brainly.com/question/24721218
Question: Multicellular organisms have five levels of organization ranging from simplest to most complex. The simplest level is the cellular level. This is an image of one type of cell found in your body: a cheek cell. You are the most complex level: you are an organism. List the five levels of organization, from simplest to most complex. Describe each level with one or two sentences. Give an example at each level.
Answer:Multicellular organisms are made of many parts that are needed for survival. These parts are divided into levels of organization. There are five levels: cells, tissue, organs, organ systems, and organisms.
Explanation:
Aisha wonders whether wind or water causes the most erosion. She set up an experiment in which she used a watering can to pour water down a pile of dirt. She then used a fan to blow wind on a second pile of dirt that is the exact same shape and size as the first pile of dirt. Aisha then measured how the height of the dirt piles changed. She also drew pictures of how their shape changed. In this experiment, what was the dependent variable?
Answer:
C.
the height and shape of the dirt piles
Explanation:
i did it
In a chemical interaction 10 g of hydrogen chloride is added to 20 g of zinc to form 24 g of zinc chloride and a certain amount of hydrogen gas. What mass of hydrogen gas is expected to be formed? 6 g ,14 g ,34 g ,54 g
According to mass conservation law, the total mass of reactants that is 20 + 10 = 30g is equal to the total mass in the product side. 24 g of Zinc chloride is formed then to obtain a total mass of 30g 6 g of hydrogen gas is expected to be formed.
What is law of conservation of mass?Law of conservation of mass states that the mass is neither created nor destroyed. Thus total mass of the system is conserved. This law is thus similar to the law of conservation of energy.
According to this law the total mass in a reaction system also conserved which means the total mass of products formed will be equal to the total mass of reactants.
In the given chemical reaction, hydrogen chloride is 10 g and zinc is 20g, thus a total of 30 g is contained by the reactant side. The mass of zinc chloride formed is 24 g. One more product is formed there, i.e., hydrogen gas.
Thus total mass of zinc chloride and hydrogen gas is expected to be total mass of reactant side i.e.,30g Hence, mass of hydrogen expected to be formed is 30-24 g = 6 g.
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Chlorine will combine with the non metal element , carbon , to form this molecular compound what is the symbol equation for this molecule?
Chlorine will combine with carbon to form a covalent bond through sharing of electrons. The formula of the formed compound is CCl₄.
What is carbon tetrachloride?Carbon tetrachloride or CCl₄ is a covalent compound formed by the combination of four chlorine atoms with a carbon atom through sharing of electrons each other.
Carbon is 6th element with 6 electrons out of which 4 are valence electrons participating in chemical bonding. It shares these 4 electrons with other atoms and by sharing 4 electrons from other element to carbon make them stable.
Cl is 17th element with 7 valence electrons. Thus, it need one more electron to achieve octet. Therefore, it shares its one electrons with carbon and one electron from carbon in turn shares to chlorine make Cl stable. Each 4 chlorines shares one electron to carbon make 8 electrons around carbon and make it stable.
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If the price of the peaches increases can be expected
A) more peaches will be sold
B) fewer peaches will be sold
C) The number of peaches so that will be unaffected
D) peach orchards will produce less fruit
Answer:
Option (B)
Explanation:
According to the demand law, the price of any product is inversely proportional to the demand for that product. This means that if the rate of any product increases, then the demand decreases. And if the rate of the product decreases then demand simultaneously increases.
in the given condition, the price of the peaches if increases, then the demand will decrease. As a result of which a lesser amount of peaches will be sold.
Hence, the correct answer is option (B)
how can bonding determine the properties of a substance?
Answer:
Explanation:
Chemical bonds are the forces that held the atoms in a molecules together. The strength of the bonds determine the some physical properties of material for example their hardness, solubility, boiling point, melting point etc. The stronger the bond , stronger will be the forces between them and it make difficult to separate the atoms.
There are three common type of bonding between atoms.
Ionic bonding
Covalent bonding
Metallic bonding
Ionic bonds are formed by complete transfer of electronic from one to another atoms. The compound having ionic bonds generally have moderate to high boiling points and melting point because of greater electrostatic interaction. Their electrical conductivity are high and these minerals tend to dissolve in water.
Covalent bonds are formed as a result of sharing of electrons between atoms. These compounds are insoluble , hard, having low melting and boiling points and have low conductivity.
The metallic bond is formed when metals are present. Due to loosely bound electrons of metals, electrons are shared with the other atoms. This is a type of covalent bond but it is not a true covalent bond. Th mobile electrons import great electrical conductivity in material. As this is a weak bond so these materials have low melting and boiling points.
which is the following example of chemical property of water in a boils at 100c be if transport has no odor D reacts with calcium
Choose all the answers that apply.
Todd drops three balls made of different materials to see how high they will bounce. He drops each ball from a height of ten feet. All the balls are the same size.
The independent variable is how high the balls bounce.
The dependent variable is the height the balls bounce.
The independent variable is the type of material the balls are made from.
The height the balls are dropped from is a control.
The size of the balls is a control.
Answer:
it shoulbe those
The dependent variable is the height the balls bounce.
The size of the balls is a control.
The independent variable is the type of material the balls are made from.
Explanation:
Where is the kinetic energy GREATEST?
Within a molecule of nitrous oxide, N2O, an atom of nitrogen combines with an atom of oxygen in a(n)
Answer:
Covalent bond
Explanation:
USA Test prep
what type of radioactive decay results in uranium-238 becoming thorium-234?
Answer:
Alpha decay
Explanation:
₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴ + energy
Properties of alpha radiation:
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number 4 less than and atomic number 2 less than the starting atom.
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
The representative elements are also called the Group A elements. Consider these representative elements:
Li - Group 1A
C - Group 4A
Cl - Group 7A.
What does the group number tell us about the electron arrangement of representative elements?
A) number of sublevels filled
B) number of electrons lost when forming compounds
C) number of electrons in the outermost energy level
D) number of energy levels in the atoms of each group
Answer:
c
Explanation:
An animal cell: the human body. Different but also alike. Your brain is the control center of your body. What is the control center of the this animal cell? A) nucleus B) ribosome C) Golgi body D) mitochondria
I thinks its A because that's what I got from the internet
The control center of the animal cell is nucleus. Thus option A is correct.
What are animal cell?An animal cell are defined as a cell enclosed by the plasma membrane and containing the membrane bounded nucleus and organelles.
It is also known as eukaryotic cell.
It is also defined as a basic unit of life of kingdom Animalia. They are the building block of animals.
An animal cell is also defined as a kind of eukaryotic cell lacking a cell wall and containing a genuine, membrane-bound nucleus as well as other cellular organelles.
Animal cell does not have cell wall, while plant cell has cell wall.
The nucleus are known as the brain of animal cell because it consist of DNA and RNA.
Thus, the control center of the animal cell is nucleus. Thus option A is correct.
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How many total atoms are in 2C6H12O6?
When comparing the freeze point and boil point if different substances the................
write the formula for calcium chloride. Explain how you determined this formula
Calcium forms an ion with a positive 2 charge and chlorine forms an ion with a negative one charg, so the formula is CaCl2
Group 1 metals and group 2 metals form positive ions by losing 1 and 2 electrons respectively. Non-metals in group 17 gain 1, group 16 gain 2 and group 15 gain 3. Elements which lose electrons form positive ions while elements that gain electrons form negative ions.
To write a formula, you must balance charges so the overall charge is zero. A simple way to do this is to swap the # of the ion's charge and make it the subscript of the other ion. However, leave off the number 1 and reduce to lowest whole number ratio.
The formula for calcium chloride is CaCl₂, derived from balancing the charges of Ca²⁺ and two Cl⁻ ions. The molar mass of CaCl₂ is 111.0 g/mol, which is calculated by adding the atomic masses of calcium and chloride.
The formula for calcium chloride is CaCl₂. This formula is determined by combining the calcium ion (Ca²⁺) with the chloride ion (Cl⁻) in a way that the overall charge is neutral. Each calcium ion has a +2 charge, and each chloride ion has a -1 charge. Because we need the charges to balance out to zero, one calcium ion will balance with two chloride ions, giving us CaCl₂. This method is sometimes referred to as the crisscross method.
When calculating the molar mass of calcium chloride, the weights of calcium (40.0 g/mol) and two chloride atoms (2 x 35.5 g/mol) are added together to get a total of 111.0 g/mol. If you were to have 3 moles of calcium chloride, as mentioned in the example, you would simply multiply the molar mass of calcium chloride by the number of moles to find the total mass required for your experiment.
does all the energy travel the same way?
In the context of energy, it is important to consider the principle of conservation of energy, which states that energy cannot be created or destroyed, only transformed from one form to another.
When energy is transferred or converted, it can take various pathways or be distributed among different forms. In a closed system where no external factors are involved, the total amount of energy remains constant.
Examples where energy may not travel in the same way:
1. Energy Transfer: In a system where energy is transferred from one object to another, the energy may not follow the same path. For instance, in a collision between two objects, kinetic energy may be transferred from one object to another, leading to changes in their motion.
2. Energy Transformation: Energy can transform from one form to another. For example, when electrical energy is used to power a light bulb, it transforms into light and heat energy. The energy may not travel the same way as it is converted into different forms.
Therefore, while the total energy remains constant due to the conservation of energy principle, the pathways and forms of energy may vary as it is transferred or transformed.
In the reaction ______ H2 + N2 ----> 2 NH3, what coefficient should be placed in front of H2 to balance the reaction?
a. 1
b. 2
c. 3
d. no coefficient is needed.
Your answer is 3.
3H2 + N2 → 2 NH3
which of the following is an example of a physical change ?
A. A Piece of iron being heated until it melts
B. Silver jewelry tarnishing
C. A piece of wood burning
How is mass calculated given density and volume Volume divided by volume, Sum of volume and mass, Density multiplied by volume, Difference of volume and mass
C. Density multiplied by volume.
4. Imagine you have a radioactive sample containing both Virtualium and decayed atoms of Virtualium. After analysis, you find it contains 10 atoms of Virtualium and 40 decayed atoms. How old is your sample?
My sample would be 4000 years old because on my graph, I had about 9 Virtualium left at trial 4 so I am guessing that it would be 4000 years old.
Spaghetti takes about 9 minutes to cook at sea level, but about 14 minutes in the mountains. Why do you think this is so?
If heat is released from water, what phase change occurs?
Explanation:
It is known that in order to break the bonds in a substance we need to provide it heat energy. Hence, energy will be absorbed by the molecules then and they will move far apart from each other.
Due to this solid state of water will change into liquid state.
On further heating, liquid state of water will change into vapor state.
But when liquid state of water will change into solid state then water molecules need to release energy due to which there occurs decrease in their kinetic energy.
Hence, the molecules will come closer to each other. As a result, liquid state of water will change into solid state (ice).
Thus, we can conclude that if heat is released from water, then phase change occurs from liquid to solid.
Name the five practices that are part of the scientific inquiry process.
Answer:
Scientific inquiry involves asking questions, performing investigations, collecting evidence, providing explanations, and communicating results.
Explanation:
Sample response from edg
Jonathan claims that since only humans can read, it must be an inherited trait, passed from human parents to their children. Is Jonathan correct in his claim?WHOEVER ANSWERS FIRST GETS BRAINLIEST ANSWER AND DONT GUESS