Answer:
are those numbers the atomic mass?
Explanation:
The number of protons, neutrons, and electrons for the atoms Zr, Hg, Ni, and Rn correspond to their atomic numbers and mass numbers, with Zr having 40 of each proton and electron and 50 neutrons, Hg with 80 of each proton and electron and 122 neutrons, Ni with 28 of each proton and electron and 30 neutrons, and Rn with 86 of each proton and electron and 136 neutrons.
To determine the number of protons, neutrons, and electrons in an atom, you need to know its atomic number (which is the same as the number of protons and electrons in a neutral atom) and its atomic mass number (which is the sum of protons and neutrons). Here's how to calculate them for each of the given isotopes:
Zirconium (Zr), with an atomic number of 40 (90Zr), has 40 protons, 40 electrons, and 50 neutrons (90-40).
Mercury (Hg), with an atomic number of 80 (202Hg), has 80 protons, 80 electrons, and 122 neutrons (202-80).
Nickel (Ni), with an atomic number of 28 (58Ni), has 28 protons, 28 electrons, and 30 neutrons (58-28).
Radon (Rn), with an atomic number of 86 (222Rn), has 86 protons, 86 electrons, and 136 neutrons (222-86).
why do elements in the same family generally have similar properties
Elements in the same family have similar properties because they have the same number of valence electrons, which determine how elements react.
Explanation:The elements in the same family generally have similar properties because they have the same number of valence electrons, which determines how elements react. The valence electrons are the outermost electrons in an atom and are responsible for chemical bonding. Elements in the same family have similar electron configurations, leading to similar chemical behavior and properties.
For example, the halogens in group 17 (7A) all have seven valence electrons and tend to gain one electron to achieve a stable electron configuration, making them highly reactive nonmetals. In contrast, the alkali metals in group 1 (1A) have one valence electron and tend to lose it to achieve a stable electron configuration, making them highly reactive metals.
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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
A sample has a mass of 15 g and a volume of 3 mL calculate the density
if I drop a watermelon from the top of one tower dorms at csu , and it takes 3.34 seconds to hit the ground , calculate how tall the building is in feet . 1 meter =3.2 ft
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.
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
When comparing the freeze point and boil point if different substances the................
For each of the given elements, list two other elements that have similar chemical properties. A. iodine B. barium C. iron
Answer:
For A: The elements having similar chemical properties as of iodine are fluorine and bromine.
For B: The elements having similar chemical properties as of barium are magnesium and calcium
For C: The elements having similar chemical properties as of iron are ruthenium and osmium.
Explanation:
In a periodic table, elements are arranged in 18 vertical columns known as groups and 7 horizontal rows known as periods.
Elements arranged in a group show similar chemical properties because of the presence of same number of valence electrons.
For A: Iodine
Iodine is present in Group 17 of the periodic table. The elements present in this group are Fluorine, Chlorine, Bromine, Iodine and Astatine.
The elements having similar chemical properties as of iodine are fluorine and bromine.
For B: Barium
Barium is present in Group 2 of the periodic table. The elements present in this group are Beryllium, Magnesium, Calcium, Strontium, Barium and Radium.
The elements having similar chemical properties as of barium are magnesium and calcium
For C: Iron
Iron is present in Group 8 of the periodic table. The elements present in this group are Iron, Ruthenium, Osmium and Hassium.
The elements having similar chemical properties as of iron are ruthenium and osmium.
Elements belonging to the same group have similar chemical properties. Hence elements that have similar chemical properties with the listed elements are :
Iodine - > Fluorine, Bromine Barium - > Beryllium, Magnesium Iron - > Hassium, OsmiumIodine belong to Group 7 on the periodic table, also called the halogen group, similar elements include chlorine, Fluorine and Bromine
Barium belongs to group 2 on the periodic table, other group 2 elements which have the same chemical properties are Calcium, Magnesium, Radium, Beryllium
Iron being group 8 and share similar chemical properties with ruthenium, Osmium and Hassium.
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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:
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.
Spaghetti takes about 9 minutes to cook at sea level, but about 14 minutes in the mountains. Why do you think this is so?
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.
which correct answer is it?
Can someone plz help me with these 5 new questions!! Will give brainliest for right answers!! Thanks!!
6. The universe has many different components. Which list places four components of the universe in the most likely order from smallest to largest?
A. Planets, stars, galaxies, nebulae
B. Nebulae, stars, planets, galaxies
C. Galaxies, stars, planets, nebulae
D. Planets, stars, nebulae, galaxies
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7. The model shows the star Wolf 359, the sun, and Star X. It takes 7.8 years for light produced on Wolf 359 to reach the sun.
A. 8 light years
B. 39 light years
C. 390 light years
D. 359 light years
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8. Which of these correctly compares the masses of different objects in the universe?
A. A moon has less mass than a star and more mass than the planet it orbits.
B. A planet has less mass than a galaxy and more mass than the star it orbits.
C. A galaxy has less mass than a moon and more mass than a planet.
D. A star has less mass than a galaxy and more mass than a planet.
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9. Darnel wants to list types of radiation based on their ability to penetrate human skin.Which list shows the order of radiation types from lowest to highest penetration?
A. Infrared radiation, microwaves, radio waves, visible light, x-rays, gamma rays, UV rays
B. X-rays, gamma rays, infrared radiation, mi- crowaves, radio waves, UV rays, visible light
C. Visible light, infrared radiation, UV rays, microwaves, radio waves, x-rays, gamma rays
D. Radio waves, microwaves, infrared radiation, visible light, UV rays, x-rays, gamma rays
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10. Ella is learning about different types of electro- magnetic radiation. She makes the following list about one frequency of radiation:· Can damage cells of living things · Blocked by Earth’s ozone layer which type of radiation does Ella’s list describe?
A. Infrared
B. Microwave
C. Ultraviolet
D. Visible
Describe what would happen to both air temperature and soil temperature if cold weather were to pass through the area.
Answer:
Described as below
Explanation:
If the air above the land is cold and the temperature of land or soil is warm this heated light air will rise upwards and cold and dense air mass will settle on the ground as a result of the amount of humidity in the air will increase. This phenomenon time may lead to the development of the front of warm and cold air also the formation of a cyclone takes place in a similar manner if it takes place in water. This could also create a temperature inversion type of conditions at night time. on average the earth temperature changes from 2-3 degrees per 100 meters in greater depths and increases from 1° to 5° C/100 m.Why is it important for scientists to replicate each other's experiments
Answer:
It is very much essential for the researchers to replicate the experiments of each other as this will assist in finding whether the essential scientific outcomes are repeatable or not. The scientific results demonstrated by a researcher should be reproducible anywhere in the globe as if it is not tan the outcomes cannot be regarded as a theory.
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.
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:
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 term refers to a change in the environment that causes an organism to take action? A. growth B. genetics C. response D. stimulus
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)
Which has more volume a kilogram of feathers or a kilogram of bricks please answer quickly thank you
What is the relationship between density and buoyancy of a fluid explain
Many fish can adjust the density of their bodies by controlling the amount of gas in a sack called a swim Blatter how what do you amount of gas in swimbladder have to change in order for the fish to swim deeper underwater explain your answer you guys please help me with these questions it is due tomorrow and I really need help
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].
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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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.
Where is the kinetic energy GREATEST?
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Which of these is an example of a chemical reaction that occurs at a very slow rate?
A. Iron Rusting.
B. An Explosion.
C. Alcohol Burning.
D. Dissolving an Antacid Tablet.
Answer:
An example of a chemical reaction that occurs at a very slow rate is:
A. Iron Rusting.
Explanation:
1. Iron rusting is a slow chemical reaction that occurs over time when iron is exposed to oxygen and moisture in the air.
2. The process of rusting involves the formation of iron oxide on the surface of the iron, which gives it a reddish-brown color.
3. This reaction occurs gradually, as the iron molecules react with oxygen and water molecules in the environment, leading to the formation of rust.
Therefore, out of the options provided, iron rusting is the best example of a chemical reaction that occurs at a very slow rate.
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A phase is state of matter, such as solid,liquid,and gas. Whatcha phases
would you see?
In Chemistry, the states or phases of matter refer to solid, liquid, and gas. A solid has a definite shape due to its closely packed particles, a liquid has a definite volume but lacks a fixed shape, and a gas is free-form with particles that can move around one another, lacking both a definite shape and volume.
Explanation:In Chemistry, the phases or states of matter generally refer to three main states, these are: solid, liquid, and gas.
A solid has a definite shape and volume because the particles (atoms, molecules, or ions) are closely packed together. They vibrate about a fixed point but do not move from place to place.
A liquid has a definite volume, but the shape changes depending on the container it is placed in. The particles are closer together than in a gas but further apart than in a solid. They move about freely, allowing the liquid to flow.
Finally, a gas has neither a definite shape nor volume. The particles are free to move around one another, taking the shape and volume of their container.
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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
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:
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