What are the 4 indications of a chemical change?
What is the volume of 13.5 g of a liquid that has a density of 0.892 g/ml?
Answer: The volume of liquid is 15.13 mL
Explanation:
To calculate mass of a substance, we use the equation:
[tex]\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}[/tex]
We are given:
Density of liquid = 0.892 g/mL
Mass of liquid = 13.5 g
Putting values in above equation, we get:
[tex]0.892g/mL=\frac{13.5g}{\text{Volume of liquid}}\\\\\text{Volume of liquid}=15.13mL[/tex]
Hence, the volume of liquid is 15.13 mL
Water is an example of a compound that is held together by what bonds
Explain the relationship between a main-group element's lettered group number (the number of the element's column) and its valence electrons. explain the relationship between a main-group element's lettered group number (the number of the element's column) and its valence electrons. the lettered group number of an element is equal to the number of valence electrons for that element. the lettered group number of an element is equal to the number of sublevels for that element. the lettered group number of a main-group element is equal to the number of sublevels for that element. the lettered group number of a main-group element is equal to the number of valence electrons for that element.
Final answer:
A main-group element's lettered group number is closely linked to its valence electrons, with groups 1 and 2 matching the group number and groups 13 to 18 having valence electrons equal to the group number minus ten. Transition metals, found in groups 3-12, do not follow this rule and can have variable valences.
Explanation:
The relationship between a main-group element's lettered group number and its valence electrons is direct and predictable. For elements in groups 1 and 2 (the alkali metals and alkaline earth metals, respectively), the group number is equivalent to the number of valence electrons. For example, elements in group 1 have one valence electron, while those in group 2 have two valence electrons.
When looking at groups 13 to 18, the number of valence electrons is equal to the group number minus ten. Thus, elements in group 13 have three valence electrons, whereas elements in group 14 have four, and so on, with the noble gases in group 18 having eight valence electrons. This relationship helps to determine the chemical properties and reactivities of the elements as they tend to react to achieve a full outer shell of valence electrons, akin to the stable electron configuration of noble gases.
However, this relationship does not apply to the transition metals (groups 3-12), as they may have variable valences. These metals often exhibit multiple possible charges and are identified using Roman numerals in their compound names, such as iron (III) chloride.
star: a object made of gas found in outer space that radiates
A star is a celestial object made of gas that radiates light and heat due to the fusion of hydrogen nuclei into helium. Not all celestial objects are stars; for example, brown dwarfs are too 'cool'. Stars exist in various stages including protostars (stars in formation) and planetary nebulas (stars near the end of their lifecycle).
Explanation:A star is a celestial object made of gas that radiates light and heat. This radiation is due to the fusion of hydrogen nuclei into helium, a process that engaged throughout much of a star's lifetime. Stars are a central object found in space and form an integral component of galaxies, including our very own Milky Way.
However, not all celestial objects that emit light and/or heat are stars. For instance, Spectral Classes L, T, and Y comprise objects that are too cool to be considered stars because they don't possess the necessary heat for hydrogen fusion to occur. These are often called brown dwarfs.
Stars exist in a variety of stages and forms. For instance, A Planetary Nebula is a stage of a star near the end of its lifecycle, during which it ejects a shell of gas that expands away from the star. On the other hand, Protostars are stars in their formation stage. These objects often emit infrared radiation due to being embedded in an envelope of dust and gas.
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An atom's nucleus has 92 protons and its mass number is 235. how many neutrons are in the nucleus? what is the name of the atom
What is the mass of 5.30×1021 platinum atoms?
Which subatomic particles are involved in chemical bonding? answee\rs.com?
The chemical formula for artificial sweetener is C7H5NO3S. Match the elements with the numbers found in one molecule of artificial sweetener.
1.Nitrogen
7 .Carbon
3.Oxygen
5.Hydrogen
Explanation: I took the test
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the chemical formula for artificial sweetener is C[tex]_7[/tex]H[tex]_5[/tex]NO[tex]_3[/tex]S.
What is atom?
Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
The chemical formula for artificial sweetener is C[tex]_7[/tex]H[tex]_5[/tex]NO[tex]_3[/tex]S.
The number of atoms of Carbon is 7.
The number of atoms of Hydrogen is 5.
The number of atoms of Nitrogen is 1.
The number of atoms of oxygen is 3.
The number of atoms of sulfur is 1.
Therefore, the chemical formula for artificial sweetener is C[tex]_7[/tex]H[tex]_5[/tex]NO[tex]_3[/tex]S.
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Which physical property refers to the temperature at which substance in a solid state transforms to a liquid state?
Answer:
Meltting point
Explanation:
Magma that is thick and viscous due to high Silica content is described as _____.
Question 1 options:
mafic
felsic
basaltic
pahoehoe
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What neutral atom has a atomic number of 15 and atomic mass of 31. 3 electrons are gained whats the result?
A molecule of common table salt, or nacl, is the result of _____ bond forming between a sodium (na) atom and a chlorine (cl) atom.
Table salt (NaCl) is made as a result of an ionic bond between sodium (Na) and chlorine (Cl). Sodium loses an electron and becomes a positive ion, while Chlorine gains this electron and becomes a negative ion. This creates an ionic bond which holds the atoms together.
Explanation:A molecule of common table salt, or NaCl, results from an ionic bond forming between a sodium (Na) atom and a chlorine (Cl) atom. In this bonding, sodium (Na), which is a metal, loses an electron and becomes a positively charged ion. On the other hand, Chlorine (Cl), a non-metal, gains this electron and becomes a negatively charged ion. This opposite charge is what holds the two atoms together in an ionic bond. This is a common characteristic of compounds formed from metals and nonmetals.
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for an endothermic reaction, which of the following conditions must be true for all products
The Answer is: The change in enthalpy is negative and potential energy diagram is lower.
What is released when an electron loses energy?
According to the concept of emission spectrum, when an electron looses energy it releases a photon of equivalent energy.
What is emission spectrum?Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.
Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.
Collection of different transitions with respect to different wavelengths makes up an emission spectrum.Emission spectrum of each element is unique and therefore spectroscopy is used to identify elements which are present in different substances.
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Evidence about Dalton's atomic theory has shown that A. all of Dalton's hypotheses were correct. B. atoms of an element can have different numbers of protons. C. atoms are divisible. D. all atoms of an element are not identical but they must all have the same mass.
How many grams of koh would be needed to produce 5.00 moles of k2so4?
Did I do this right?
Answer:
Looks good :)
Explanation:
When 10.0 g of lead are heated with 1.6 g of sulfur, 11.6 g of lead sulfide are formed. how many grams of lead sulfide form when 10.0 g of lead are heated with 3.0 g of sulfur?
What is the concentration of the base (NaOH) in the following titration?
3.0 M
142.2 M
3.79 M
3.86 M
what is part of every cell
The Milky Way is classified as a ______ galaxy.
Spiral galaxy
Explanation;Spiral galaxy is among the three major types of galaxies, the others being elliptical galaxy and irregular galaxy.Spiral galaxies are twisted collection of stars and gas with beautiful shapes often made up of hot young stars.They contain a central bulge surrounded by a flat, rotating disk of stars.The stars, gas and dust are gathered in spiral arms that spread outward from the galaxy's center.The milky way is a spiral galaxy that includes Earth and our solar system .In naming a binary molecular compound the number of atoms of each element present in the molecule is indicated by
Answer:
Using prefix before the name of each element
Explanation:
When naming a binary compound the number of atoms is represented by a prefix before the name of the element.
For example:
In CO2, the name is carbon dioxide (prefix di- meaning 2)In CCl4, the name is carbon tetrachloride (prefix tetra- meaning 4) In N2O5, the name is dinitrogen pentoxide (prefix di- and pent- meaning 2 and 5)In an atom, the number of neutrons determines most specifically the ________.
In an atom, the number of neutrons determines most specifically the isotopes of an element.
Further ExplanationAn atom An atom is defined as the smallest particle of an element that can take part in a chemical reaction.Atoms are made of energy shells and the inner nucleus.It is also made up of subatomic particles, protons and neutrons.Neutrons They are sub-atomic particles in an atom that are found in the nucleus of an atom. They have a zero charge or no charge.Neutrons are slightly heavier than protons.The number of protons and neutrons in a nucleus of an atom results to the atomic mass number of an atom. Like protons they only take part in nuclear reactions.ProtonsProtons are subatomic particles that are found in the nucleus of an atom. They are positively charged. with a charge of +1.The number of protons differ from one element to another and thus used as the atomic number of an individual element.The nucleus of an atom is positively charged due to the positive charge of the protons. Additionally, protons do not take part in chemical reactions but in nuclear reactions.Electrons They are found orbiting the nucleus on energy shells based on Clouds’ theory. Electrons are negatively charged each with a charge of -1.The number of electrons and protons in a neutral atom are equal. Additionally they have the least mass of the three sub-atomic particles.Electrons are the only sub-atomic particles that take part in chemical reactions.Isotopes Isotopes are atoms of the same element that have the same mass number but different atomic number.Mass number;Mass number is the sum of the number of protons and neutrons in the nucleus of an atom of an element.Keywords: Atom, sub-atomic particles, electrons, protons, neutrons, isotopes
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Subject: Chemistry
Topic: Atomic structure
In an atom, the number of neutrons determines most specifically the [tex]\boxed{{\text{isotopes}}}[/tex].
Further Explanation:
The smallest component of an element and the building block of matter is known as an atom. It is made up of a central part which is called atomic nucleus. It contains protons and neutrons in it. Nucleon is a collective term that is used for both protons and neutrons. Electrons revolve around the nucleus in definite circular paths called orbits. Protons are the subatomic particles having a positive charge whereas neutrons do not carry any charge. Electrons are negatively charged subatomic particles. An atom is usually denoted as [tex]_{\text{Z}}^{\text{A}}{\text{X}}[/tex], where X is the element symbol, Z is the atomic number and A is the atomic mass or mass number.
Atomic number indicates the total number of protons present in the nucleus of an atom. In other words, the total positive charge in the atomic nucleus is known as the atomic number. The total number of nucleons present in the atomic nucleus is known as the atomic mass.
The atoms of the same element that has the same atomic number but different atomic masses are called isotopes. For example, [tex]_{\text{6}}^{{\text{11}}}{\text{C}}[/tex] and [tex]_{\text{6}}^{{\text{12}}}{\text{C}}[/tex] are isotopes. Both these atoms belong to the carbon element so these have the same atomic number (6) and therefore the number of protons is the same in both. For a neutral atom, the number of electrons is equal to the number of protons so these have the same number of electrons also. The only difference in these is the number of neutrons which is different in both isotopes. [tex]_{\text{6}}^{{\text{11}}}{\text{C}}[/tex] has 5 neutrons while there are 6 neutrons in [tex]_{\text{6}}^{{\text{12}}}{\text{C}}[/tex].
Therefore, the number of neutrons determines the isotopes of an element.
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Component of John Dalton’s atomic theory: https://brainly.com/question/2357175 Basis of investigation for the scientists: https://brainly.com/question/158048Answer details:
Grade: Senior School
Chapter: Atomic structure
Subject: Chemistry
Keywords: atom, element, matter, atomic nucleus, electrons, protons, neutrons, subatomic particle, A, X, Z, atomic number, positive charge, orbits, circular paths, isotopes.
Mole-Atom Conversions
1. How many moles are 1.55 x 1027 atoms of Zinc (Zn)?
2. How many atoms are in 25.0 moles of calcium (Ca)?
3. How many atoms are in 0.35 moles of carbon (C)?
4. How many moles are 7.6 x 1024 atoms of Helium?
Mole-Mass Conversions
How many moles in 28.o grams of Oxygen?
What is the mass of 5.0 moles of Iron?
Find the number of moles of argon in 452 g of argon.
Find the grams in 16.5 mol of Hydrogen.
.
The answers to the mole-atom and mole-mass conversions are as follows:
2.6 × 10³ moles of Zinc1.51 × 10²⁵ atoms of Ca2.11 × 10²³ atoms of C12.6 moles of He1.75mol280g of Fe11.33mol of Argon16.5grams of HHOW TO CALCULATE MOLE-ATOMS QUESTIONS?Mole-atom questions can be calculated using the following expression;
no. of atoms = no. of moles × 6.02 × 10²³
QUESTION 1:
Number of moles in Zinc is calculated as: 1.55 x 10²⁷ atoms ÷ 6.02 × 10²³
= 2.6 × 10³ moles of Zinc.
QUESTION 2:
The number of atoms in 25 moles of Calcium is 25 × 6.02 × 10²³
1.51 × 10²⁵ atoms of Ca.
QUESTION 3:
The number of atoms in 0.35 moles of carbon (C) is 0.35 × 6.02 × 10²³
2.11 × 10²³ atoms of C
QUESTION 4:
The number of moles in 7.6 x 10²⁴ atoms of Helium is 7.6 × 10²⁴ ÷ 6.02 × 10²³
= 1.26 × 10¹ = 12.6moles of He.
QUESTION 5:
The number of moles in 28.0 grams of oxygen is 28g ÷ 16g/mol = 1.75mol
QUESTION 6:
The mass of 5.0 moles of Iron (Fe) is 5moles × 56g/mol = 280g
QUESTION 7:
The number of moles of argon in 452g of argon is 452g ÷ 39.9g/mol = 11.33mol
QUESTION 8:
The grams in 16.5 mol of hydrogen is 16.5mol × 1 = 16.5grams.
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Name two elements that have properties similar to those of beryllium and have average atomic masses higher than 130
Final answer:
Barium and strontium are two elements with properties akin to beryllium and atomic masses greater than 130.
Explanation:
Two elements that have properties similar to beryllium and atomic masses higher than 130 are barium and strontium. Both barium and strontium belong to the alkaline earth metals group and exhibit similar chemical properties to beryllium.
An experiment requires 42.5 g of sulfuric acid, which is easier to measure by volume than by mass what voliume should be measured out if the denstiy of the sulfuric acid is 1.84
Using proportions,
if x is the unknown volume we have:
1.84 / 1 = 42.5 / x
Multiply both sides above by x:
1.84*x / 1 = 42.5
1.84*x = 42.5
Divide both sides by 1.84:
x = 42.5 / 1.84
X = 23.10 mL
Answer:
The volume of liquid is 23.098 mL.
Explanation:
To calculate mass of a substance, we use the equation:
[tex]\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}[/tex]
We are given:
Density of sulfuric acid= 1.84 g/mL
Mass of sulfuric acid =42.5 g
Putting values in above equation, we get:
[tex]1.84 g/mL=\frac{42.5 g}{\text{Volume of liquid}}\\\\\text{Volume of liquid}=15.13mL[/tex]
Hence, the volume of liquid is 23.098 mL.
All of the atoms making up any given element have the same number of ________.
Every element has a variable number of protons in its atoms, yet every element has the same number of protons in all of its atoms. For instance, all helium atoms have two protons; such atoms do not exist in any other element.
What are the number proton in an atom shows?The number of protons in the atom's nucleus is equal to the atomic number (Z). There are exactly as many electrons as protons in a neutral atom.
The total number of protons and neutrons in the atom's nucleus is equal to the mass number (M) of the atom.
The atomic number of an element is determined by the quantity of protons it contains in its nucleus.
To put it another way, every element has a special number that indicates how many protons are contained in each of its atoms.
Therefore, All the atoms making up any given element have the same number of proton.
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Write out the rule for determining total magnification of a compound microscope
The rule for the determine of total magnification of an image is that:
When observing specimen with the aid of a microscope, you can get the amount of total magnification by using the power of the objective which exist in 4X, 10X, 40x form and multiply by the power of the ocular (eyepiece) which is often 10X.That is if ocular lens is: 10X (ocular) mutiplied by 4X (objective) = 40X will be the total magnification all togetherFor better understanding let's explain what the Total magnification means
Magnification is commonly referred to as the ratio of the size of a specimen (image) to the real size of that object Total magnification is simply known as what we get when objective lens is multiplied by the ocular lens. (e.g. 40x +10x = 400x)Note that in determining total magnification is done by the amount or number all together of the times a specific specimen that an individual is observing is magnified.Eyepiece is simply known to increase or magnifies a specific object.Objectives often exist in 4X, 10X, 40X and it simply increases or magnify the specimen size.From the above we can therefore say that the answer The rule for the determine of total magnification of an image is that:
When observing specimen with the aid of a microscope, you can get the amount of total magnification by using the power of the objective which exist in 4X, 10X, 40x form and multiply by the power of the ocular (eyepiece) which is often 10X.That is if ocular lens is: 10X (ocular) mutiplied by 4X (objective) = 40X will be the total magnification all together is correctLearn more about total magnification from:
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What are different types of chemical reactions? there are two different kinds of chemical reactions, chemical and physical?
Final answer:
Chemical reactions are classified into various types like combination, decomposition, single replacement, double replacement, combustion, acid-base, precipitation, and redox reactions. Physical changes differ from chemical changes in that they do not alter the substance's composition. Chemical changes can be indicated by observable phenomena like color change or formation of a precipitate.
Explanation:
Chemical reactions are processes where reactants transform into products with different properties. In chemistry, reactions are classified into combination, decomposition, single replacement, double replacement (exchange reactions), combustion, acid-base reactions, precipitation reactions, and oxidation-reduction (redox) reactions. These are the basic models used to describe how atoms and molecules interact during chemical changes.
Understanding Physical and Chemical Changes
It's important to note the difference between physical changes, which are changes in the state or appearance of a substance that do not affect its chemical composition, and chemical changes that result in new substances with different properties. Indications of a chemical change may include a color change, temperature change, emission of light, formation of bubbles, or formation of a precipitate. Generally, chemical changes are more difficult to reverse when compared to physical changes.
Common Examples of Chemical Reactions
Examples of these reaction types include the formation of water from hydrogen and oxygen (combination), the breakdown of hydrogen peroxide to water and oxygen (decomposition), the replacement of silver in a compound by copper (single replacement), the formation of sodium chloride from the reaction of hydrochloric acid and sodium hydroxide (acid-base neutralization), and the rusting of iron (redox).