To find the number of electrons, just subtract the amu and the atomic number (aka number of protons or electrons)...
so it is...
9-4=5 neutrons
Brainliest plz! :)
The number of neutrons in a neutral atom of beryllium is equal to 5. Therefore, option (B) is correct.
What is a neutral atom?A neutral atom can be defined as an atom in which the number of the negative charge is equal to the number of the positive charge. Therefore, the overall electric charge on the neutral atom is zero.
We can say that for a neutral atom, the number of protons in an atom is equal to the number of electrons in that atom. All elements arranged in the modern periodic table are in a neutral state.
The atomic mass or average mass of the atom is the sum of the number of protons and neutrons in the nucleus of that atom.
Given, the average mass of beryllium (Be) atom = 9 amu
Therefore, protons + neutrons = 9 in the one Be atom
The number of electrons in Be atom = 4
The number of neutrons in netural beryllium atom = 9 - 4 = 5
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Which of these actions isn’t part of your body’s homeostasis? A. Sweating when your hot B. Breathing harder when u excercise C. Smiling when you’re happy or D. Going to the bathroom
Answer:
C. smiling when you're happy
Explanation:
SInce it's just an emotion and isn't actually that nessary
the half-life of U234 is 25200 years. How much of a 100 gram sample remains after 352800 years?
Leon made a chart to summarize some characteristics of LED light bulbs.
Which headings best complete the chart?
X: Cost-Effectiveness
Y: Time-Effectiveness
X: Time-Effectiveness
Y: Cost-Effectiveness
X: Benefits
Y: Risks
X: Risks
Y: Benefits
The answer is C. X: Benefits
Y: Risks
Answer:
x benefits y risks
Explanation:
how do you know if a reaction is exothermic
Living organisms all have DNA and RNA which are both _______
How are osmosis and diffusion alike
Both processes can occur though semipermeable membranes
Both levees can occur though permeable bilayer membranes
Both require additional energy provided by channel proteins
Botha low solute molecules to move across a semipermeable membrane
Answer: Option A
Explanation:
The osmosis can be defined as a biological process where the movement of the particles takes place through the semipermeable membrane.The solvent moves from a region of high concentration to low concentration.
The diffusion is same in the reference that it can also occur through the semipermeable membrane.
The particles from the higher concentration moves towards the lower concentration.
Hence, option A is correct.
A chemist isolates an element that is suspected to have a principal quantum number equal to 5. What is the maximum number of electrons that can occupy this level?
The maximum number of electrons that can occupy the principal quantum number 5 is 50, calculated using the formula 2n² where n is the principal quantum number.
Explanation:The maximum number of electrons that can occupy the fifth energy level (n = 5) of an atom is determined by the formula 2n2. For n = 5, this formula gives:
2 × 52 = 2 × 25 = 50 electrons
Therefore, the maximum number of electrons that can occupy the principal quantum number 5 is 50. This includes the possible subshells in that energy level: 5s, 5p, 5d, and 5f, with the number of orbitals in each subshell being one s-orbital, three p-orbitals, five d-orbitals, and seven f-orbitals, respectively.
What kind of Romance Novels would kids between the age of 14-18 read. Whether it is an actual book or a book made on sites like Wattpad.
Give a description of your characters, story plot, time/setting, etc.
Is there magic? Is it realistic? Fiction or Nonfiction, why? Vampires? Talking animals?
Anyone have any ideas when it comes to finding that perfect Romance Novel?
Note: I am not talking about a book that is required in school to read. I am talking a book that you randomly find, and actually, think it would be interesting to read.
For ages 14-18, young adult romance novels are popular, often blending aspects of realism and romanticism. Examples include books like 'Twilight', 'The Fault in Our Stars', and 'Divergent'. These novels provide relatable plots and characters while offering an escape into various genres like fantasy, mystery, and dystopian fiction.
Explanation:Teenagers between the ages of 14-18 often lean towards young adult romance novels that incorporate elements of fantasy, mystery, and realism. Two popular categories of stories that these novels might follow are romance and the bildungsroman, a genre focusing on the growth of its main character, fitting given the phase of life teenagers are in.
For example, 'Twilight' by Stephenie Meyer that offers a blend of romance and fantasy with the main characters being a teenage girl and a vampire, set in contemporary times. Other examples are 'The Fault in Our Stars' by John Green, a poignant love story between two teenagers met at a cancer support group, and 'Divergent' by Veronica Roth that blends romance with dystopian fiction.
The beauty of these novels is they take variations from the type of normal life (romanticism) and incorporate them into real life settings (realism). These stories provide young readers an escape from their day-to-day lives, while also offering relatable plots and characters that they can connect with on a personal level. Regardless of whether the novels have elements like magic, vampires, or talking animals, the primary focus rests on the exploration of human emotions, friendships, and romances, imparting a sense of both imagination and reality.
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All organic compounds are found in living organisms. True or False
The answer is actually False.
Answer:
FALSE
Explanation:
I got the question correct.
Is coffee a pure substance or a mixture?
Answer:
its is a subtance
Explanation:
ifff im wrong im soooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo sorry.# i wasted my time on that lol.
Coffee is considered a mixture rather than a pure substance because it is made up of multiple components that can be separated. Coffee is a mixture, not a pure substance, due to the variety of components that combine to make it, such as caffeine, water, oils, and other organic compounds.
Explanation:In chemistry, coffee is considered a mixture rather than a pure substance. A mixture is a combination of two or more substances that are not chemically joined together. Coffee is made up of various components such as water, caffeine, oils, and flavor compounds, which can all be separated through various methods.
For example, if you were to run a coffee extraction process using water, you would separate the soluble components of coffee from the insoluble ones. This demonstrates that coffee is not chemically pure but rather a mixture.
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The solubility of kcl in ethanol is 0.25 g / 100 ml at 25 oc. how does this compare to the solubility of kcl in water?
Final answer:
The solubility of KCl in ethanol is 0.25 g/100 mL at 25°C. Compared to the solubility of KCl in water, KCl is much more soluble in water than in ethanol.
Explanation:
The solubility of KCl in ethanol is 0.25 g/100 mL at 25°C. This means that at this temperature, 0.25 grams of KCl can dissolve in 100 mL of ethanol. Comparing this to the solubility of KCl in water, we can see that the solubility of KCl in water is generally much higher. While the solubility of KCl in ethanol is 0.25 g/100 mL, the solubility of KCl in pure water at 25°C is 27.8 g/100 mL. Therefore, KCl is much more soluble in water than in ethanol.
Match each processes with the correct transfer of energy.
~Energy Loss ........ ~Energy Gain
Freezing
Sublimation
Evaporation
Melting
Deposition
Condensation
freezing-energy lost (exothermic)
sublimation-energy gain (endothermic)
evaporation- energy gain(endothermic)
Melting- energy gain(endothermic)
deposition- energy lost(exothermic)
condensation-energy lost(exothermic)
Answer:
freezing-energy lost (exothermic)
sublimation-energy gain (endothermic)
evaporation- energy gain(endothermic)
Melting- energy gain(endothermic)
deposition- energy lost(exothermic)
condensation-energy lost(exothermic)
Making models involves creating representations of complex objects or processes to help people study and understand things that cannot be observed directly. A. true B. false
The statement is true; models are used to represent complex systems that are difficult to study directly, such as subatomic particles or large-scale environmental processes.
Explanation:Making models involves creating representations of complex objects or processes to help people study and understand things that cannot be observed directly. The correct answer to the student's question is A. True.
Scientific models are simplified versions of a part of the real world that help us understand, analyze, and predict behaviors of complex systems. These models can take the form of physical constructions, mathematical equations, computer programs, or simulations. For instance, atomic models allow us to visualize and understand the structure of an atom, even though atoms are far too small to be seen with the bare eye.
Models are particularly beneficial in fields like physics, where phenomena at very small scales or very high speeds occur, which are beyond human perception. However, it is essential to acknowledge that models are approximations and are not as detailed as the real phenomena they represent, and it's important to understand their limitations.
Check Your Understanding
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Explain the value or importance of using the International System of Units when describing motion. Provide an example that supports your reasoning.
Animal
Explanation:
e e e e e e e e e e e e e e e e e e.
how does the universe move?
How properties before and after a chemical reaction can be used to determine if a chemical reaction occurred
1.Hydrogen is colorless odorless gas that is less dense than air it will react with oxygen to form water which of the following is a chemical property of hydrogen?
It is a gas
it is less dense than air
It is colorless
It reacts with oxygen to form water
2. Sodium is a shiny solid at room temperature it will react with chlorine to form table salt it will react violently with water which of the following is a physical property of sodium?
It is a solid at room temperature
it reacts with chlorine to form table salt
it reacts violently with water
3.Mercury has a density of approximately 5.43 g/ml. If a sample of mercury has a volume of 10ml, what must be the mass of the samples
54.3g
5.43g
0.543g
4.57g
A physical propery of halite (table salt) is its chemical composition.
The molecules in compound AB are strongly polar, while the molecules in compound XY are non polar. Which substance probably has a higher boiling point
What role do the coefficients serve in a chemical reaction?
Coefficients balance the equation with respect to the law of conservation of energy.
Coefficients increase the products to increase the efficiency of the reaction. Coefficients balance the equation with respect to the law of conservation of mass. Coefficients increase the reactants to help the reaction proceed.
The coefficients balance the equation with respect to the law of conservation of mass.
A coefficient in a balanced chemical reaction is a numeral written before the symbol of a compound or an element. Also known as a stoichiometric coefficient.The coefficient is used to balance the number of elements present on the reactant and product sides of a chemical reaction.The balancing of the number of elements on both sides is done because the chemical reaction follows the law of conservation of mass.So, from this, we can conclude that the coefficients balance the equation with respect to the law of conservation of mass.
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Which of the answer choices correctly identifies a scenario that displays evidence a chemical reaction is occurring?
Paper absorbs liquid and sinks.
Sugar burns and turns black.
Water boils and evaporates.
Glass vibrates and shatters.
Answer: Option (b) is the correct answer.
Explanation:
A chemical reaction is the one in which there occurs change in the chemical composition of a substance in order to result in the formation of a new compound.
For example, when sugar burns then it means it is chemically reacting due to which it turns into black.
On the other hand, a physical change is the one in which there occurs no change in chemical composition of a substance. As a result, no new compound is formed.
For example, Paper absorbs liquid and sinks, Water boils and evaporates, and Glass vibrates and shatters are all physical changes.
Thus, we can conclude that sugar burns and turns black correctly identifies a scenario that displays evidence a chemical reaction is occurring.
which of the following elements does not form a monatomic ion? A.potassium B.sulfur C.chlorine D.xenon
Xenon does not typically form a monatomic ion.
Explanation:In this question, we need to identify the element that does not form a monatomic ion. A monatomic ion is an ion consisting of only one atom.
Potassium (K) forms a monatomic ion with a charge of +1, sulfur (S) can form a monatomic ion with a charge of -2, and chlorine (Cl) can form a monatomic ion with a charge of -1.
However, xenon (Xe) does not typically form a monatomic ion. Xenon belongs to the noble gas family and is highly stable due to its full valence electron shell, so it rarely forms ions.
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What does the law of conservation say about matter?
sand grains, pebbles, mud, shells, and leaves are all examples of _________________
Answer:
The correct answer is "sediment".
Explanation:
A sediment is defined as a solid material that settles down to the bottom of a liquid. Sand grains, pebbles, mud, shells, and leaves are all examples of sediment. The size of a sediment variables from small particles that could be of 2 millimeters (in the case of sand grains), to particles as large as 250 millimeters (in materials such as cobble).
To squeeze a gas into a smaller space you
As an environmental engineer how would you apply the process of separating mixtures to clean up a polluted beach? What would you do first? Second? Third? What equipment would you need? Explain your process.
Does H₂O have a subscript?
explain how you can use physical properties to compare substance
To compare a substance physically, different methods have been applied like measure the dimensions of an object, calculation of volume. physical property also tell you whether the substance is a solid, liquid, or a gas.
What are the difference between chemical and physical property ?Chemical properties of a substance can be measured when a substance undergoes any type of chemical change where as Physical properties does not require any chemical changes, it can be directly observed.
A chemical reaction is conducted to show the chemical property of a substance where as no chemical reaction is required to determine the physical property.
In Chemical properties the compounds are connected by the chemical bonds while in Physical properties the compounds do not show such a relationship.
Some of the Chemical properties include Compressibility, flammability, toxicity, radioactivity while physical properties include Molecular weight, melting point, length, color, odor, shape.
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why did the people of chungungo need to use nets to catch moisture in the air
The people of chungungo need to use nets to catch moisture in the air to capture the water droplets present in the environment and collect the water for various uses.
What is moisture in the air?The moisture in the air is the tiny water droplets that are present in the environment or in the air it is mostly present in the cold zone of the environment.
The chungungo is a desert coast area and their is lot of the shortage of the water in their areas and the chances of rain is very low so the people of there use the net to capture the water drops from the air.
Therefore, people of chungungo need to use nets to catch moisture in the air to capture the water droplets present in the environment and collect the water for various uses.
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Final answer:
The people of Chungungo use nets to capture moisture from the air due to limited fresh water sources in their region. This technique is a form of atmospheric water collection and has historical precedence dating back to the Old Stone Age.
Explanation:
The people of Chungungo needed to use nets to catch moisture in the air because they inhabit an area with limited access to fresh water. This innovative method allows them to collect water from fog and mist, which is especially valuable in arid or semi-arid regions where rainfall is scarce. Using nets as a form of atmospheric water collection is an ancient technique with roots tracing back to the Old Stone Age, as evidenced by archaeological findings similar to the limestone “sinkers” from the Maedun cave in South Korea, which date to 27,000 BC. These sinkers were tied to nets to catch small fish in streams, showcasing the long history of using nets for various forms of capturing and harnessing natural resources.
Write a brief explanation about why a plant extract is a mixture
A plant extract is a mixture due to the fact that it contains multiple compounds physically combined, they retain their individual characteristics. This makes the composition of extracts heterogeneous. Mixtures in the form of plant extracts are especially important in pharmaceutical science.
Explanation:A plant extract is considered a mixture due to the fact that it contains multiple compounds physically combined, not chemically bonded. These compounds usually include various elements of the plant like oils, pigments, and other organic molecules, all present in varying amounts. The plant extract retains the characteristics of its individual components because they are not chemically reacting with one another, but simply mixed together, making it a heterogeneous mixture, as the same drop of the extract might have different compounds in different proportions.
This is not much unlike the example of an Italian dressing, where in different parts of the mixture you may find more oil or vinegar or herbs because the ingredients separate and settle unevenly throughout the mixture. Similarly, in a plant extract, the compounds will not be proportionately arranged in every drop of the mixture.
Particularly in pharmaceutical science, this heterogeneous nature is an advantage as different plants contain unique combinations of beneficial compounds. Examples include medicines such as aspirin and codeine, which were once derived from plant extracts. This demonstrates the importance of mixtures in medicinal applications.
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Calculate the mass of oxygen that combines with 20.4g of magnesium to form 34.0g of magnesium oxide
To solve such this we must know the concept of double displacement reaction. Therefore, the mass of oxygen is 27.2g when 20.4g of magnesium react with 34.0g of magnesium oxide.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
The balanced reaction is
2Mg+ O [tex]_2[/tex][tex]\rightarrow[/tex]2MgO
mass of Magnesium =20.4g
Molar mass of magnesium =24gmol
moles of magnesium =0.85moles
moles of magnesium = moles of oxygen =0.85moles
Mass of oxygen =Molar mass of oxygen ×moles of oxygen
=32g/mol×0.85moles
=27.2g
Therefore, the mass of oxygen is 27.2g.
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