A block of aluminum occupies a volume of 15.0 mL and has a mass of 40 g. What is its density?
*
Cut off the decimal at the hundredth place. Don't forget your units!
Answers
Related Questions
in nuclear reactions, information about the nuclei that take place in the reaction and the nuclei that are produced can be written out in an equation form. when looking at equations like this, how can you identify a reaction as a fission reaction?
Answers
By looking at a nuclear reaction, a fission reaction can be easily identified as it shows the breakdown of a larger atom into two or more smaller nuclei.
What is nuclear reaction?it is the formation of one or more new nuclides by the collision of two nuclei or external subatomic particles. Nuclear reactions are of two types:
Nuclear fission reaction Nuclear fusion reactionIn nuclear fission reaction, a heavier nucleus splits into several smaller lighter nuclei fragments and two or more neutrons. These fragments, or fission products, are either equal to or half of the original mass of the atom The reaction proceeds with a very high emission of energy.
\(238_{92}\)U → \(234_{90}\)Th + \(4_{2}\)\(\alpha\)
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What is the mass of 4 moles of CO₂?
Answers
The first thing we need to do is calculate the mass of one mole of carbon dioxide, and we get:
(Mass of Carbon) + (Mass of 2 Oxygen atoms) = Molar mass
Mass = 12 + (2 × 16) = 44gTherefore, carbon dioxide has a molar mass of 44 grams, which is the mass of the gas
In order to determine the mass of 4 molecules of carbon dioxide, we need to multiply it by 4 × 44 = 176g.
Hope this helps :)
\({ \qquad\qquad\huge\underline{{\sf Answer}}} \)
Here we go ~
lets calculate Molar mass of \({\sf CO_2} \) :
\(\qquad \sf \dashrightarrow \: Molar \: \: mass \: \: of \: \: C O _2 = 12 + 2(16)\)
[ Molar mass of\({\sf \: CO_2 } \)= Molar mass of Carbon + 2×( Molar mass of Oxygen )]
\(\qquad \sf \dashrightarrow \: Molar \: \: mass \: \: of \: \: C O _2 = 12 + 32\)
\(\qquad \sf \dashrightarrow \: Molar \: \: mass \: \: of \: \: C O _2 = 44 \: g\)
[ i.e 1 mole of \({\sf CO_2} \) weights 44 grams ]
So, by unitary method :
\(\qquad \sf \dashrightarrow \: 1 \: \: mole \: \: CO_2 = 44 \: \: g\)
\(\qquad \sf \dashrightarrow \: 4 \: \: moles \: \: CO_2 = (44\times 4) \: \: g\)
\(\qquad \sf \dashrightarrow \: 4 \: \: moles \: \: CO_2 = 176 \: \: g\)
Therefore, 4 moles of CO2 weights 176 grams
this experiment tests how the temperature of water affects the time it takes for antacid tablets to dissolve. 1. what is the independent variable? 2. what is the dependent variable? materials
Answers
The independent variable in this experiment is the temperature of the water. The dependent variable in this experiment is the time it takes for the antacid tablets to dissolve.
The independent variable in this experiment is the temperature of the water. This is the variable that is being manipulated and changed in order to observe its effect on the dependent variable. The dependent variable in this experiment is the time it takes for the antacid tablets to dissolve. This is the variable that is being measured and observed in relation to the independent variable. The change in the independent variable (temperature of the water) will result in a change in the dependent variable (time for the antacid tablets to dissolve).
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As a result of this process, the proportions of oxygen and carbon dioxide in
air breathed in and air breathed out change.
Which one of the statements is true? Tick the correct box. [1]
- Air breathed out has less carbon dioxide and more oxygen than air breathed in.
- Air breathed out has less carbon dioxide and less oxygen than air breathed in.
- Air breathed out has more carbon dioxide and less oxygen than air breathed in.
- Air breathed out has more carbon dioxide and more oxygen than air breathed in.
Answers
Answer:
the third one
Explanation:
When you breathe in, you inhale oxygen and exhale carbon dioxide
The energy required to remove a valence electron from a gaseous atom or ion is called ____ energy
Answers
Ionization potential
The energy required to remove an electron from a neutral isolated gaseous atom and convert it into a positively charged gaseous ion is called ionisation potential. It is also called ionisation energy. The electron to be removed is valence electron. It is most loosely bound electron. The ionisation potential corresponds to the process X (g) → X + (g) + e −
Answer:Ionization Energy Trends in the Periodic Table. The ionization energy of an atom is the amount of energy required to remove an electron from the gaseous form of that atom or ion.
Explanation:
Oxygen has an atomic number of 8. Which of the following could form the nucleus of an atom of oxygen?
6 protons and 8 neutrons.
4 protons and 4 neutrons. 6 protons and 2 neutrons. 8 protons and 10 neutrons.
Answers
Answer:
Answer: 8 protons and 8 neutrons
Explanation:
The mass number of oxygen is 16
Atomic number is 8
but proton number = atomic number = 8 protons
\(neutrons = mass \: number - atomic \: number \\ \)
neutrons = 16 - 8 = 8 neutrons.
The nucleus of an atom of oxygen typically contains 8 protons and 8 neutrons specifically. So, none of the above options is correct.
What is the formula for calculating the atomic number?The atomic number may be defined as the number of a chemical element in the periodic table through which the elements are arranged in order of increasing the number of protons in the nucleus.
The atomic number of an element = The number of protons in the nucleus of an atom.
Now, according to the question,
If Oxygen has an atomic number of 8, that means the number of protons = 8.
The number of neutrons can be calculated as follows:
Neutrons = mass number - the atomic number.
= 16 - 8 = 8 neutrons.
Therefore, the nucleus of an atom of oxygen typically contains 8 protons and 8 neutrons specifically. So, none of the above options is correct.
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I need help with energy
Answers
Answer:
Explanation:
The correct answer is
energy resulting from the flow of charged particles , such as electrons or ions.
hope it helps :)
Oxygen gas is prepared in the laboratory through the catalytic decomposition of hydrogen peroxide. Define a catalyst
Answers
Answer:
Catalyst:
Explanation:
A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
How many atoms or molecules are in 5.0 moles of the following?
a. O
b. N
c.MgCl₂
d. C₂H₃NO
Answers
Answer:
They all have the same number of molecules or atoms which is 3.011*10²⁴ molecules or atoms.
5 moles of O = 3.011*10²⁴ molecules or atoms
5 moles of N = 3.011*10²⁴ molecules or atoms
5 moles of MgCl2 = 3.011*10²⁴ molecules or atoms
5 moles of C2H3NO = 3.011*10²⁴ molecules or atoms.
Explanation:
a)
5 moles of O = ?
1 mole of any substance is equal to Avogadro's number which is equal to 6.022×10²³molecules or atoms
From the question above,
5 moles of O = 5 × 6.022*10²³ = 3.011×10²⁴atoms or molecules.
b)
5 moles of N
From the same principle or fundamentally stated fact above,
1 mole of any substance = 6.022*10²³molecules or atom
5 moles of N = 5 × 6.024
2*10²³ = 3.011*10²⁴atoms or molecules.
c)
5 moles of MgCl₂
Same principle we used in a and b,
1 mole of any substance = 6.022*10²³ atoms or molecules
5 moles of MgCl2 = 5.0×6.022*10²³ = 3.011*10²⁴ atoms or molecules.
d)
5 moles of C₂H₃NO = ?
1 mole of C₂H₃NO = 6.022*10²³molecules or atoms
5 moles = x molecules or atoms
x = 5 × 6.024
2*10²³ = 3.011*10²⁴ atoms or molecules
What this proves is that no matter the compound, molecule or element, as long as they have equal amount of moles, they'll have the same number of atoms, molecules or particles.
Answer:
a. 3.011x10²⁴ atoms of O in 5 moles.
b. 3.011x10²⁴ atoms of N in 5 moles.
c. 3.011x10²⁴ atoms of MgCl₂ in 5 moles.
d. 3.011x10²⁴ atoms of C₂H₃NO in 5 moles
Explanation:
A mole is defined as the number of atoms in exactly 12.000g of ¹²C.
This number is equal to 6.022x10²³. That means 1 mole is equal to 6.022x10²³.
Thus:
a. O . 5 moles of oxygen (An atom) are:
5 moles O ₓ (6.022x10²³ atoms of O / mole) = 3.011x10²⁴ atoms of O in 5 moles
b. N . Also, 5 moles of nitrogen are:
5 moles N ₓ (6.022x10²³ atoms of N / mole) = 3.011x10²⁴ atoms of N in 5 moles
c. MgCl₂ . Magnesium chloride is a molecule. Again, 1 mole of MgCl₂ contains 6.022x10²³ molecules and 5 moles are:
5 moles MgCl₂ ₓ (6.022x10²³ molecules of MgCl₂ / mole) = 3.011x10²⁴ atoms of MgCl₂ in 5 moles
d. C₂H₃NO. 5 moles of C₂H₃NO are:
5 moles C₂H₃NO ₓ (6.022x10²³ molecules of C₂H₃NO / mole) = 3.011x10²⁴ atoms of C₂H₃NO in 5 moles
As you can see, number of molecules of 1 mole doesn't depend on the nature of the substance.
How do ionic bonds form between atoms?
Answers
hydrogen bonds form between... group of answer choices neighboring water molecules because of the viscosity of water. neighboring water molecules because of the polarity of water molecules. neighboring water molecules because of electron transfer. neighboring oxygen and hydrogen atoms because of electron sharing. neighboring water molecules because of electron sharing.
Answers
Hydrogen bonds form between neighboring water molecules because of the polarity of water molecules. Hydrogen bonds are formed between two: neighboring water molecules because of the polarity of water molecules.
What is a hydrogen bond?A hydrogen bond is a form of dipole-dipole attraction that occurs between a hydrogen atom bonded to a highly electronegative atom and an unshared pair of electrons on a different electronegative atom. A hydrogen bond is a form of intermolecular force that is weaker than a covalent bond but stronger than the other dipole-dipole interactions.
In a water molecule, the oxygen atom has a higher electronegativity than the hydrogen atoms, resulting in a polar covalent bond. The oxygen atom of one water molecule has a partial negative charge, while the hydrogen atoms of another water molecule have a partial positive charge.
As a result, a hydrogen bond forms between them. The hydrogen bond between neighboring water molecules is critical for the properties of water. It is responsible for the high surface tension and heat capacity of water.
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why can flame tests be effectively utilized to identify a cation in a solution?
Answers
The flame test can be effectively used to identify a cation in a solution because when a cation is placed in a flame, it will emit a different color with
visibile light.
Ions are charged particles that form when atoms gain or lose electrons. When an atom gains electrons, it forms negatively charged ions called negative ions. On the other hand, positively charged ions, called cations, are formed when atoms lose electrons. These ions can be detected in solution using special tests. The flame test involves exposing a joint to a flame and identifying the joint by flame color. The color of the flame test is due to the fact that electrons in metal cations are excited and jump to higher energy levels.
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determine the best type graph to use if you are trying to compare quantities for four separate options that are not related to the dependent or independent variables and that are not measured over time. explain
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Bar graph is the best type of graph to use if you are trying to compare quantities for four separate options that are not related to the dependent or independent variables and that are not measured over time.
What are bar graphs?Bar graphs are the type of graph that can be used when the data measurement between different variable are not continuous or not measured over time.
The advantages of bar graphs include the following:
Summarizes large data in visual form.Clarifies Trends better than tables. Easily understood by most people. Allows estimation of key values at a glance. Permits visual check of accuracy and reasonableness of calculations. Displays relative numbers or proportions of multiple categories.Therefore, Bar graph is the best type of graph to use if you are trying to compare quantities for four separate options that are not related to the dependent or independent variables and that are not measured over time.
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Which of the following statements correctly describe the procedure for drawing a Lewis structure? (Select all that apply.)
a. A single bond, which represents 2 electrons, should be placed between every two atoms.
b. Nonbonding electrons should be excluded from the Lewis structure.
c. For a neutral molecule the sum of the number of valence electrons for each atom gives the number of electrons used in the Lewis structure. d. Halogen atoms are usually places at the center of the structure.
e. An electron is added to the total count for each negative charge on the species
Answers
The correct statements that describe the procedure for drawing a Lewis structure are:
c. For a neutral molecule, the sum of the number of valence electrons for each atom gives the number of electrons used in the Lewis structure.
e. An electron is added to the total count for each negative charge on the species.
a. This assertion is untrue. If two atoms are joined by a bond, a single bond representing two electrons should be placed between them; however, not every pair of atoms in the Lewis structure must be linked by a connection.
b. This assertion is untrue. Since they increase the number of valence electrons and have an impact on the overall structure, nonbonding electrons, sometimes referred to as lone pairs, should be included in the Lewis structure.
d. This assertion is untrue. Halogen atoms are typically not positioned in the structure's center. The arrangement of formal charges of the atoms in a molecule and their overall electronegativity determine where they are placed in a Lewis structure.
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To draw a Lewis structure, you should place single bonds between atoms, include nonbonding electrons, and use the sum of the valence electrons for a neutral molecule.
Explanation:The correct statements that describe the procedure for drawing a Lewis structure are:
A single bond, which represents 2 electrons, should be placed between every two atoms. This follows the octet rule, where each atom tries to acquire 8 valence electrons. Nonbonding electrons should be included in the Lewis structure. These are the lone pairs of electrons that are not involved in bonding with other atoms. For a neutral molecule, the sum of the number of valence electrons for each atom gives the number of electrons used in the Lewis structure. This ensures that all valence electrons are accounted for.Learn more about Lewis structure here:https://brainly.com/question/34631490
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Consider the chart describing the element. According to the chart, the element is _______ with an atomic number of ___________. Question 8 options: neon; 3 boron; 4 lithium; 3 nitrogen; 7.
Answers
The periodic table is known to consist of different elements. According to the chart, the element is lithium with an atomic number of 3.
Lithium is known too be the third element on the periodic table after hydrogen and helium.This element is mostly used in the production of rechargeable batteries for mobile phones, laptops, etc. and it is also used non-rechargeable batteries for production of heart pacemakers, toys, etc.
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The H-R diagram is useful in
studying all of these about a star
A.except for its brightness b.location in the sky c.temperature
D.magnitude
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Answer:
b.location in the sky (If the question is saying:The H-R diagram is useful in
studying all of these about a star except for)
Explanation:
The theoretical HR diagram plots the temperature of the star vs their luminosity (brightness) and the observational HR diagram plots color of the stars vs the absolute magnitude. Depending on mass, stars will also go through specific evolutionary stages that can be seen through the location of the star on the HR diagram. However, the HR diagram will not have data on the location of the star in the sky.
what is the octet rule?
Answers
Answer:
the octet rule is a chemical rule of thumb that reflects the observation that main group elements and bonds and such a way that each has a electrons in its valence shell giving the same electronic configuration as noble gas
Match the terms to their definition.
1 .
Male gonads
conception
2 .
a body chemical that controls growth and activity
eggs
3 .
The fertilization of a female egg cell with a male sperm cell
fertilization
4 .
The union of the male gamete (sperm cell) and the female gamete (egg cell)
gonad
5 .
gamete-producing organ in animals
hormone
6 .
Female reproductive cells
ovary, ovaries
7 .
The male reproductive cell
sperm
8 .
Female gonads
testes, testicles
Answers
Answer:
2
Explanation:
Answer:
1. Sperm - The male reproductive cell
2. Fertilization - The union of the male gamete (sperm cell) and the female gamete (egg cell)
3. Conception - The fertilization of a female egg cell with a male sperm cell
4. Testes, Testicles - Male gonads
5. Ovary, Ovaries - Female gonads
6. Gonad - Gamete-producing organ in animals
7. Eggs - Female reproductive cells
8. Hormone - a body chemical that controls growth and activity
Explanation:
Hope this helped!
I don't know how to write about tentative.....can u help me?
Answers
Answer:
The definition of tentative is not definite or final. An example of tentative is possible, though not definite, plans to go to the movies sometime on Friday.
SOMEONE HELP ILL BRAINLISTTTTTTY. Write in your own wordsss. I’ll give you 70 points and a brainlist in total. Which is enough write it in full sentence summarise a paragraph or so not too long but yeah make it make sense.
1) Give a specific example of a species of plant or animal that had been identified as ‘vulnerable’ or ‘endangered’ or ‘extinct’ as a result of water pollution. Give details - where, when and why did it happen?
Answers
Answer:
Explanation:
Hawksbill turtles were identified as endangered due to water pollution. Chemical pollutants can weaken turtle's immune systems making them prone to diseases. Plastic packaging, nylon fishing lines etc can be eaten by turtles or they may get stuck in them resulting in death.
sorry this is the only details i can give
How many moles is 1.5 x10 20?
Answers
2.49 x \(10^{-4}\) moles is equal to 1.5×\(10^{20}\). The number of moles is equal to the number of molecules divided by Avogadro's number, 6.022×\(10^{23}\).
This means that 1.5×\(10^{20}\)moles are equal to
1.5×\(10^{20}\)/6.022×\(10^{23}\)
0.24908×\(10^{-3}\)
2.49 x \(10^{-4}\) moles.
Avogadro's number: Avogadro's number is a constant used in chemistry to represent the number of atoms or molecules in a mole of a substance. It is equal to 6.022 x \(10^{23}\). Or we can say that Avogadro's number is, the number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 1023. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction.
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Which is a group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a compound?
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A chemical formula is a group of chemical symbols and numbers that express the elements and the number of atoms of each element that compose a compound.
What is the chemical formula?A chemical formula of a compound offers information about the proportions of each chemical element in a given chemical compound or molecule.
The chemical formula of a compound can be written by including the chemical symbols of elements, numbers as subscripts, and symbols, such as plus (+) and minus (−) signs, dashes, commas, and brackets.
A chemical formula exhibits no words but simple chemical structures can be drawn but not full structures. Chemical formulae must be limited in power rather than chemical structural formulae.
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• What happens to matter during chemical reactions Are the atoms the same or different before and after the reaction?
Answers
Answer:
only the atoms present in the reactants can end up in the products.
Explanation:
the volume of 350. ml of gas at 25°c is decreased to 135 ml at constant pressure. what is the final temperature of the gas?
Answers
The decrease in the volume of gas at constant pressure results in the final temperature of the gas is 115.05 K.
The Charles law states that with the gas constant pressure there has been a proportional relationship between the volume and temperature.
Gas is a state of matter that has no fixed shape and no fixed volume. Gases have a lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between particles, which have a lot of kinetic energy and aren't particularly attracted to one another.
Kinetic electricity is the energy an object has due to its movement. If we need to boost up an item, then we ought to follow a pressure. applying a force calls for us to do paintings. After work has been achieved, energy has been transferred to the item, and the object might be shifting with a brand new consistent pace.
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A cell is classified as a __________________ if the genetic material is inside the nucleus.
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g if solid na3p04 is added to a saturated aqueous solution of ca3(p04)2, what will happen to the concentration of ca2 in solution?
Answers
The Concentration of Na₃PO₄is decreases due Common ion effect when it is added to a saturated aqueous solution of Ca₃(PO₄)₂ .
Common ion effect:
Common ion effect refers to the reduction in solubility of an ionic precipitate by adding to the solution a soluble compound that has an ion common to the precipitate. This behavior is a result of Le Chatelier's principle of equilibrium ionic association/dissociation reactions.
Solid Na₃PO₄is added to a saturated aqueous solution of Ca₃(PO₄)₂. Ca₃(PO₄)₂ and water are in balance and the products Ca²⁺ and PO₄³⁻.
Ca₃(PO₄)₂ + H₂O --> Ca²⁺+ PO₄³⁻
Na₃PO₄ --> Na⁺ + PO₄³⁻
Na₃PO₄ dissolve into the solution and forming Na⁺ and PO₄³⁻ ions.
the concentration of PO₄³⁻ ions increases, which causes the reaction equilibrium to shift to the left, which makes more Na₃(PO₄), and the concentration decreases.
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approved eye protection is to be worn a. for certain experiments b. only for hazardous experiments c. when you work in the fume hood d. all the time
Answers
From the given information, approved eye protection is to be worn for certain experiments. Eye protection is an important safety measure in laboratories and other settings where hazardous materials or equipment are used.
However, it is not necessary to wear eye protection all the time, only when it is necessary to protect the eyes from specific hazards. For example, eye protection may be required when working with chemicals that can splash or when using equipment that can produce flying debris or particles.
It is important to follow the specific safety guidelines and regulations for your particular laboratory or workplace. These guidelines will specify when eye protection is required and what type of eye protection is appropriate for the task at hand. It is always better to err on the side of caution and wear eye protection when in doubt.
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which molecule is oxidized during aerobic respiration?
Answers
Answer:
Glucose
Explanation:
glucose
During aerobic respiration, the oxygen taken in by a cell combines with glucose to produce energy in the form of Adenosine triphosphate (ATP), and the cell expels carbon dioxide and water. This is an oxidation reaction in which glucose is oxidized and oxygen is reduced.
What is the dominant
intermolecular force
found between hydrogen
iodide molecules?
Hydrogen
Ion-dipole
Dispersion
Dipole-dipole
Answers
Answer:
Dipole-Dipole
Explanation:
Iodine is a halogen is that is partially negative while the hydrogen is partially positive. So it will create this dipole attraction among the molecules.
Not hydrogen bonding since the only molecules that can participate are N, O, F.
Not Ion-Dipole since that is usually for ionic compounds.
Not disperion forces since it's the weakest of the forces.
explain what will happen to the ksp if not all the salt dissolves in the solution preparation.
Answers
The Ksp, or solubility product constant, is defined as the product of the concentrations of the ions of a sparingly soluble salt raised to the power of their stoichiometric coefficients. If not all of the salt dissolves during solution preparation, the Ksp will be affected.
The solubility product constant (Ksp) is a constant that quantifies the solubility of an ionic compound. The main answer to the question is that the Ksp will remain the same, regardless of the amount of salt that dissolves in the solution preparation. the concentration of the ions will be different, depending on how much of the salt dissolved. The long answer is that the Ksp formula, which is given as [Aⁿ⁺]m[Bⁿ⁻]n, assumes that all of the salt is dissolved, or at least has the potential to dissolve in the solution. The solubility of the salt is directly proportional to the concentration of the ions in the solution.
Therefore, if not all of the salt dissolves in the solution preparation, the concentration of the ions will be lower than the expected value based on the Ksp formula. that the Ksp is a constant that remains unchanged, regardless of whether all of the salt dissolves in the solution preparation or not. The reason is that the Ksp is a property of the salt and is related to its solubility, not its dissolution rate. if the solubility is affected, then the concentration of the ions in the solution will also be affected. Therefore, the Ksp formula may need to be modified based on the actual concentration of the ions in the solution.
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