Which came first the henry g.j moseley atomic model or the niels bohr atomic model?
Isotopes of the same element differ only in the number of electrons they contain. isotopes of the same element don't usually have the same properties.
According to the steps of problem-solving, which of the items below is out of order?
A. Choose the specific tools to use.
B. Check and format.
C. Set up the problem, estimate, and calculate.
D. Determine the method of solution.
Finding energy and wavelength?
How can the rate of a reaction be increased?
A increasing the temperature
B decreasing the amount of reactants
C having less surface area
D having a lower concentration of reactants
What are the three end products of the oxidation-reduction reactions involved in metabolism?
List two examples of carbohydrates and two examples of lipids.
Answer:
Two examples of Carbohydrate : Galactose , Sucrose
Two examples pf Lipids : Fats , steroids
how does stability relate to how quickly a substance breaks down?
This will require considerable effort to break down a chemical if it is very stable. If anything is unstable, it will fall apart quickly and easily.
What is stability of compounds?Chemical stability in chemistry refers to a chemical system's thermodynamic stability. When a system was still in its lowest energy state or in chemical relationship with its surroundings, thermodynamic stability occurs. It could be a dynamic relationship when the total number of atoms or molecules in a given shape is conserved despite the fact that individual molecules or atoms change forms.
Chemical systems may experience a series of chemical reactions or changes in the material's phase. A chemical substance's reactivity describes how it might react in a range of hypothetical chemical systems also, for a software set, how quickly such a reaction might develop. This will require considerable effort to break down a chemical if it is very stable. If anything is unstable, it will fall apart quickly and easily.
Therefore, this will require considerable effort to break down a chemical if it is very stable. If anything is unstable, it will fall apart quickly and easily.
To know more about stability of compounds, here:
https://brainly.com/question/2050643
#SPJ2
what is the name for SO2
Final answer:
The name for SO2 is sulfur dioxide, where 'sulfur' is the name of the element and 'dioxide' indicates the presence of two oxygen atoms.
Explanation:
The name for SO2 is sulfur dioxide. This compound is a mixture of sulfur and oxygen, where the sulfur atom is joined by two oxygen atoms. Sulfur, being lower in the periodic table, comes first in the compound's name. Since there are two oxygen atoms, we use the prefix 'di-' to indicate the quantity, resulting in 'dioxide' when combined with the stem 'ox-' and the suffix '-ide'. Therefore, the complete chemical name is sulfur dioxide. It is important to note that sulfur forms another common compound with oxygen, which is SO3 or sulfur trioxide. Each of these compounds has distinct chemical and physical properties, necessitating unique names for accurate identification.
Why did mendeleev switch iodine and tellurium?
Parts of Dalton’s atomic theory were disproved. Do you think that this should be taken as a criticism of Dalton as a scientist? Use a description of what you think a good scientist is to support your answer.
No because he did have a small idea allowing later more educated scientist in more modern times to review and find mistakes. This allowed scientist in more modern times to also have develop theories. Every idea needs fixing and this is one. Since he was first to know about such atoms and making the "plum pudding model", he gave scientists some thoughts or possible ideas as to what a substance would be like after its last piece.
A quantity of 1.922 g of methanol (ch3oh) was burned in a constant-volume bomb calorimeter. consequently, the temperature rose by 5.14°c. if the heat capacity of the bomb plus water was 8.69 kj / °c, calculate the molar heat of combustion of methanol.
The molar heat of combustion of methanol is -745kJ/mol
Molar Heat of CombustionThis is heat released to the environment when one mole of a substance in this case methanol is completely burned.
Data given;
Mass of methanol = 1.922gChange in temperature = 5.14° CHeat capacity of the bomb calorimeter + water = 8.69kJ/°CNumber of molesThe number of moles of methanol is the ratio between the mass to the molar mass of methanol
mass = 1.922gmolar mass = 32g/mol[tex]n=\frac{m}{M}\\n=\frac{1.922}{32}\\n=0.06moles[/tex]
The number of moles present in 1.922g of methanol is 0.06moles.
Heat of combustionThis is the heat required to completely burn a substance
[tex]Q=mc[/tex]ΔT
[tex]Q=8.69*5.14=44.67kJ[/tex]
Molar Heat of CombustionΔH = [tex]-(\frac{Q}{n})[/tex]
n = number of moles
ΔH = [tex]-\frac{44.7}{0.06}=-745kJ/mol[/tex]
The molar heat of combustion is -745kJ/mol
Learn more about molar heat of combustion here;
https://brainly.com/question/25109613
What is the main product of the calvin cycle?
In which cases do you expect deviations from the idealized bond angle? PF3 SBr2 CS2 CHCl3
Deviations from the idealized bond angle occur due to the presence of lone electron pairs on the central atom. For the molecules PF3 and SBr2, the bond angles deviate from the ideal angles because of the lone pairs on the central atoms. On the contrary, CS2 and CHCl3, with no lone pairs on the central atom, do not deviate.
Explanation:In Chemistry, deviations from the idealized bond angle are typically observed in molecules where one or more of the central atoms possess lone electron pairs. These lone pairs keep more space causing the bond angles to be less than the ideal angles predicted by the VSEPR (Valence Shell Electron Pair Repulsion) model.
PF3: In PF3 molecule, the central phosphorus atom has one lone pair which makes the bond angle less than the ideal 109.5° SBr2: The sulfur central atom has three lone pairs in SBr2 making the bond angle less than 120° CS2: There are no lone pairs on the central atom (Carbon) in CS2, so it will not deviate from the ideal 180° CHCl3: In CHCl3, there are no lone pairs on the central Carbon, so the bond angle would be close to 109.5°. Learn more about Bond angles here:
https://brainly.com/question/34663556
#SPJ6
what are the structures with specialized functions suspended in the cytoplasm of a eukaryotic cell
Eukaryotic cells have specialized structures called organelles suspended in the cytoplasm, each with their own unique functions.
Explanation:Eukaryotic cells have specialized structures suspended in the cytoplasm, known as organelles, which carry out specific functions.
Some of the organelles found in eukaryotic cells include:
Mitochondria: Responsible for cellular respiration and energy production.Peroxisomes: Involved in lipid biosynthesis and breakdown of various molecules.Endoplasmic reticulum: A network of membranous structures involved in protein synthesis, lipid metabolism, and detoxification.Golgi apparatus: Modifies, sorts, packages, and transports proteins and lipids.Lysosomes: Contain enzymes for intracellular digestion and waste removal.These organelles, among others, contribute to the overall function and organization of eukaryotic cells.
Learn more about Organelles in eukaryotic cells here:https://brainly.com/question/29776469
#SPJ3
How many milliliters of a stock solution of 5.00 m hcl would you have to use to prepare 1.00l of a 0.0800 m hcl?
British physicist Joseph John Thomson was the first to identify the
Final answer:
Joseph John Thomson discovered the electron, a fundamental negatively charged particle, developing the plum pudding model of the atom and earning a Nobel Prize for his contributions to physics.
Explanation:
British physicist Joseph John Thomson was the first to identify the electron, a negatively charged particle. In 1897, Thomson conducted groundbreaking experiments with cathode rays, proving that they were composed of particles rather than waves, because of their negative electric charge. He achieved this through meticulous experiments sending a pure beam of these particles through crossed electric and magnetic fields and balancing the fields until there was no net deflection of the beam. This allowed him to calculate the charge-to-mass ratio of the electron, revealing that its mass was significantly smaller than any known atom - precisely 1837 times smaller. Thomson's work led to the development of the plum pudding model of the atom, in which the atom was imagined as a sphere of positive charge with electrons dispersed within it, similar to plums in a pudding. His pioneering work paved the way for our modern understanding of the atomic structure and for this, he was awarded the Nobel Prize in Physics in 1906.
How many orbitals are completely filled in an atom that has 12 electrons?
There are six orbitals completely filled in an atom that has 12 electrons.
What is an electron ?The elementary electric charge of the electron is a negative one, making it a subatomic particle. The first generation of lepton particles includes electrons.
There are two electrons in each orbital, and their spins vary. An electron in a specific subshell can be located in an atom's orbital, a region of space. A maximum of two electrons with the opposite spin can fit in any orbital. One 1s orbital and two electrons are contained within the first shell.
Only a specific number of electrons can fit in each shell: the first shell can hold up to two, the second shell up to eight (2 + 6) electrons, the third shell up to 18 (2 + 6 + 10) electrons, and so on.
Thus, There are six orbitals completely filled in an atom that has 12 electrons.
To learn more about an electron, follow the link;
https://brainly.com/question/1255220
#SPJ5
Solution 1 has a pH of 6.5. When Solution 2 is poured into Solution 1, the new solution has a pH of 5.2. What must be true of Solution 2?
It contains no hydroxide ions.
It is more acidic than Solution 1.
It is a basic solution.
It had a pH of 6.5.
I just answered on my test. the answer is B.
The statement, that describes which must be true of Solution 2 that poured into Solution 1 with pH of 6.5 is "It is more acidic than Solution 1."
What is pH?A solution's pH is a measure of its hydrogen ion concentration, which is a measure of its acidity. In other terms, pH is a scale that specifies the acidity or basicity of an aqueous solution.
The scale ranges from zero (the most acidic) to fourteen (the most basic). The pH scale above shows that pure water has a pH value of 7. That is, pH values less than 7 are acidic, while pH values greater than 7 are alkaline (basic). As a result, solution 2 is acidic and contains more hydrogen ions than solution 1, because an acidic solution has a pH value less than 7.
Hence the correct answer is more acidic than Solution 1.
Learn more about pH here
https://brainly.in/question/19115750
#SPJ2
Why is a single system of measurements necessary throughout the scientific community?
Since so much of the data is shared and evaluated around the world, using the same measurement systems allows for no confusion among scientists. When they discuss and report, everyone understands what is being communicated.
Which of these elements does not exist as a diatomic molecule? (1 point)?
Answer:
An easy way to remember the diatomic molecules is HOFBrINCl
almost sounds like hofbrinkle
How to find molecular formula from empirical formula?
To find the molecular formula from the empirical formula, multiply each subscript in the empirical formula by the number of empirical formula units per molecule. This number can be obtained by dividing the molecular mass by the empirical formula mass.
Explanation:The molecular formula is derived from the empirical formula by multiplying each of its subscripts by n, which represents the number of empirical formula units per molecule. To find the value of n, you need to compare the molecular or molar mass of the compound to its empirical formula mass. Divide the molecular mass by the empirical formula mass to determine n. Then, multiply each subscript in the empirical formula by n to obtain the molecular formula.
Learn more about Molecular Formula from Empirical Formula here:https://brainly.com/question/34012285
#SPJ12
Place coefficients in the reactants and or products to balance the following chemical reactions.
1. Fe + S FeS
2. H2 + Cl2 HCl
3. Mg + O2 MgO
4. O2 + H2 H2O
5. HgO Hg + O2
6. Ca + H2O Ca(OH)2 + H2
7. CH4 + O2 CO2 + H2O
8. Na2O2 + H2(SO4) Na2(SO4) + H2O2
9. N2 + H2 NH3
10. Al + O2 Al2O3
11. KMnO4 K2O + MnO + O2
To balance chemical equations, coefficients are adjusted so that the number of each type of atom and the charge are the same on both sides. For example, the reaction between magnesium and oxygen is balanced by writing 2Mg + O2 → 2MgO, demonstrating the principle of conservation of mass.
Explanation:Balancing chemical equations involves adding coefficients to the reactants and products so that the same number of each type of atom occurs on both sides of the equation. To balance the listed equations:
Fe + S → FeS: This equation is already balanced with a coefficient of 1 for all reactants and products.H2 + Cl2 → HCl: The balanced equation is H2 + Cl2 → 2HCl.Mg + O2 → MgO: The balanced equation is 2Mg + O2 → 2MgO.O2 + H2 → H2O: The balanced equation is O2 + 2H2 → 2H2O.HgO → Hg + O2: The balanced equation is 2HgO → 2Hg + O2.Ca + H2O → Ca(OH)2 + H2: The balanced equation is Ca + 2H2O → Ca(OH)2 + H2.CH4 + O2 → CO2 + H2O: The balanced equation is CH4 + 2O2 → CO2 + 2H2O.The key to balancing equations is to systematically adjust coefficients, ensuring both mass and charge are conserved.
Give the complete electronic configuration for oxygen. 1s22s22px22pz2 1s22s22px4 1s22s22py22pz2 1s22s22px22py2 1s22s22px22py12pz1
In the reaction below, how many grams of h2o(g) are produced when 2.1 grams o2(g) are consumed? c4h6(g) + o2(g) → co2(g) + h2o(g)
Combustion reactions are most conveniently studied _____. hints combustion reactions are most conveniently studied _____. there is no way to study a combustion reaction conveniently using a beaker and a thermometer using constant-pressure calorimetry using constant-volume calorimetry
Grace is given a piece of wood, an iron nail, and a styrofoam cup. She puts these objects into a bucket of water and observes that the nail sinks to the bottom, the wood floats just under the surface, and the cup floats on top of the water. What property is being demonstrated by this experiment.
Explanation:
Density is defined as the degree of compactness or mass per unit volume.
Mathematically, density = [tex]\frac{mass}{volume}[/tex]
It can be seen from the formula that mass is proportional to density. That is, more is the mass of an object more will be its density.
Therefore, it is given that iron nail sinks to the bottom this means that the iron nail has highest density as compared to the piece of wood and a styrofoam cup.
Thus, we can conclude that given experiment demonstrates the density of given objects.
Which elements are metals? check all that apply. rhenium (re) boron (b) lithium (li) krypton (kr) phosphorus (p) mercury (hg)?
ANSWER
Lithium, rhenium , mercury , are metals out of given five elements.
As lithium is a alkali metal , rhenium and mercury both are transition metals.
based on the electronic configurations of the metals , they have valence electrons present in their valence shell which are easily available for donation so that they can attain stable electronic configuration and thus they are considered as metals.
boron is a non metal which is the member of group 13 of the periodic table.
krypton is a noble gas which is a member of group 18 of the periodic table.
phosphorus is a non metal member of group 17 of the periodic table.
What is the auf bau principle?
The Aufbau Principle explains that electrons fill the lowest available energy levels in atomic orbitals before moving to higher levels. It helps determine the electron configuration of atoms, considering the periodic table, Hund's Rule, and the Pauli Exclusion Principle. This principle is essential for understanding atomic structure in chemistry.
The Aufbau Principle (German for “building up” principle) is a fundamental guideline in chemistry used to determine the electron configuration of an atom. It states that electrons fill atomic orbitals of the lowest available energy levels before occupying higher energy levels. In other words, the 1s subshell is filled before the 2s subshell, and the 2s subshell is filled before the 2p subshell, and so on.
This principle helps in constructing the electron configuration of an element by building it up step-by-step through the periodic table. For example, a carbon (atomic number 6) atom has an electron configuration of 1s2 2s2 2p2, which means it has filled the 1s subshell, then the 2s subshell, and finally partially filled the 2p subshell with two electrons.
Additionally, other rules like Hund's Rule and the Pauli Exclusion Principle work alongside the Aufbau Principle to determine the unique arrangement of electrons within orbitals. Hund's Rule states that electrons must occupy every orbital singly before any orbital is doubly occupied, and the Pauli Exclusion Principle asserts that no two electrons can have the same set of quantum numbers.
Utilizing these principles, students can accurately determine the ground-state electron configurations of atoms across the periodic table.
What makes up 90 percent of interstellar gas? hints what makes up 90 percent of interstellar gas? hydrogen carbon dioxide helium carbon monoxide?