2. Electron A falls from energy level X to energy level Y and releases blue light. Electron B falls from energy level Y to energy level Z and releases red light. Which transition, from X to Y or from Y to Z, has a greater energy difference? Explain your answer and how you arrived at it. Use a diagram of the electromagnetic spectrum.
The answer is transition from Y to Z, has a greater energy difference because the red light means higher energy and the blue light means lower energy.
You would be able to find this on the diagram of electromagnetic spectrum.
PLLLLLLZZZZ BRAINLEST!!!!!!!!!!!!!!!!!!
Which of the following is NOT a part of Dalton's atomic theory?
Select one:
a. atoms of the same elements are identical
b. all elements are composed of atoms
c. atoms combine in simple whole number ratios
d. atoms are always in motion
atoms are always in motion. i took the test and got it correct
Answer:
The correct answer is (D) Atoms are always in motion is not a part of Dalton's atomic theory because Dalton never sated about atomic motion in his atomic theory. Other options are the part of Dalton's atomic theory.
Explanation:
According to Dalton's atomic theory:
1. Every element is made up of tiny atoms.
2. The atom of the same element shares the same property.
3. The atoms of different elements differ in properties.
4. Atoms cannot be seen and are indestructible.
Dalton never describe the motion of atoms in his theory
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In order to climb a steep hill on a bicycle, a rider shifts to the lowest gear. The lowest gear has the greatest mechanical advantage because it
The answer to your question is (B) because it does requires the least amount of force for the bicycle to climb the hill.
The atmosphere of the gas giants is usually made up mostly of hydrogen and ______.
Answer: Helium
Explanation:
_______________ reactions transfer energy to the surroundings, usually as heat.
A 10.63 g sample of mo2o3(s) is converted completely to another molybdenum oxide by adding oxygen. the new oxide has a mass of 11.340 g. add subscripts below to correctly identify the empirical formula of the new oxide.
The empirical formula of the new oxide is MoO₃.
1) Find the number of moles of Mo₂O₃: n= mass/Mwt=(18.75)/(239.9)=0.0782 mol of Mo₂O₃ 2)
Find the number of moles of Mo in Mo₂O₃: 1 mol Mo2O3 --> 2 moles of Mo
0.0782 mol of Mo₂O₃ --> X moles of Mo X = (2×0.0782)/1
=0.156 mol of Mo
In the first oxide (it would be the same for the second oxide “see step 3”) 3) The mass of Mo in the second oxide doesn’t change (because the question said that oxygen has been added “only”, therefore, the mass of Mo in the first oxide = the mass of Mo
in the second oxide: Mass of Mo = n x Mwt of Mo
= 0.156 x 95.95
= 14.97 grams.
4) Find the mass of oxygen in the second oxide: mass of the second oxide = mass of Mo + mass of O
Mass of O = Mass of the second oxide – Mass of Mo
= 22.50 – 14.97
= 7.53 grams
5) Find the empirical formula by finding their number of moles first, then divide it by the smallest number of moles:
mass of Mo = 14.97 grams --> moles of Mo
= 0.156 mol of Mo
mass of O = 7.53 grams
moles of O = 0.471 mol of O
Divide by the smallest number of moles (by 0.156)
Therefore, the new empirical formula is MoO₃.
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The empirical formula of the new oxide is MoO₄.
To identify the empirical formula of the new oxide, we need to calculate the number of moles of molybdenum and oxygen in the new oxide.
Moles of molybdenum:
Moles of molybdenum = 11.340 g / 95.94 g/mol = 0.118 mol
Moles of oxygen:
Moles of oxygen = (11.340 g - 10.63 g) / 16.00 g/mol = 0.0436 mol
Empirical formula:
The empirical formula of the new oxide is MoO_{x}, where x is the number of moles of oxygen per mole of molybdenum. We can calculate x by dividing the moles of oxygen by the moles of molybdenum:
x = 0.0436 mol / 0.118 mol = 0.370
Rounding to the nearest integer, we get x = 4. Therefore, the empirical formula of the new oxide is MoO₄.
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A stack of books are sitting on the table. Which force is pulling it down ? A. Buoyant force B. Pressure force C. Gravitational force
There is a gravitational force pulling the stack of books downward. Gravity is always a factor on earth. Keep that in mind when asked these sort of questions. They are made to confuse you. Take your time and you will do just fine.
What celsius temperature, t2, is required to change the volume of the gas sample in part a (t1 = 43 ∘c , v1= 1.13×103 l ) to a volume of 2.26×103 l ? assume no change in pressure or the amount of gas in the balloon?
The Celsius temperature required to change the volume of the gas sample to a specific volume at constant pressure can be found using Charles's Law. In this case, the temperature, volume, and initial conditions are given, allowing us to solve for the unknown temperature. By substituting the values into the formula, we find that the required temperature is 316 K.
Explanation:A volume change caused by a temperature change at constant pressure means we should use Charles's law. Taking V₁ and T₁ as the initial values, T2 as the temperature at which the volume is unknown and V₂ as the unknown volume, and converting °C into K we have:
T₂ = (T₁ * V₂) / V₁
Substituting the given values:
T₂ = (43 + 273) * (2.26 × 10³) / (1.13 × 10³)
T₂ = 316 K
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To change the gas volume from 1.13×10³ L at 43°C to 2.26×10³ L, the required temperature is 359°C. This is calculated using Charles's Law and converting temperatures between Celsius and Kelvin.
Calculating the Required Temperature Using Charles's Law
To solve this, we will use Charles's Law, which states that the volume of a gas is directly proportional to its temperature (in Kelvin) when pressure and the amount of gas are constant. The formula for Charles's Law is:
V₁ / T₁ = V₂ / T₂
First, we convert the temperatures from Celsius to Kelvin:
T₁ = 43°C + 273 = 316 K
Next, we rearrange Charles's Law to solve for T₂:
T₂ = (V₂ × T₁) / V₁
Substitute the known values into the equation:
T₂ = (2.26×10³ L × 316 K) / 1.13×10³ L
T₂ = 632 K
Finally, convert the temperature from Kelvin back to Celsius:
T₂ = 632 K - 273 = 359°C
Thus, the required temperature t₂ is 359°C.
Why does a primary alochol have a higher boiling point than a secondary alcohol?
If a particular compound is composed of elements A and B, the ratio of the mass of B to the mass of A will always be the same. This is a statement of the law of ____________________________.
Classify each as the following:element, compound, or mixture:
1. helium
2. water
3.sodium
4. a sedimentary rock
5.salt
6.air
Helium and Sodium are elements, Water and Salt are compounds, while Sedimentary Rock and Air are mixtures.
Explanation:To correctly classify each substance, we need to understand what elements, compounds, and mixtures are. An element is a pure substance consisting of only one type of atom. A compound is a substance made up of two or more different elements that are chemically bonded. A mixture is composed of two or more different substances that retain their own properties and can be separated physically.
Helium - Element: Helium is a type of atom and thus is an element. Water - Compound: Water is composed of two hydrogen atoms and one oxygen atom chemically bonded, making it a compound. Sodium - Element: Sodium is a type of atom, making it an element. Sedimentary Rock - Mixture: Sedimentary rock is formed from a blend of minerals and organic material, qualifying it as a mixture. Salt - Compound: Salt (NaCl) is composed of sodium and chloride ions chemically combined, hence it's a compound. Air - Mixture: Air is a mixture of various gases like nitrogen, oxygen, carbon dioxide.Learn more about Classifying Substances here:
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how many significant figures in 11 soccer players
Complete this equation for the dissociation of na2co3(aq). omit water from the equation because it is understood to be present.
In water Sodium carbonate dissociates to form Sodium hydroxide and carbon dioxide.
The dissociation reaction for Sodium carbonate is
[tex]\rm \bold{ Na_2CO3 \rightarrow 2 Na^(^+^) + CO_3^(^2^-^)}[/tex]
In water the sodium ion will react with [tex]\rm \bold {OH^-}[/tex] ion of water to form Sodium Hydroxide.
[tex]\rm \bold{ Na_2CO3_(_a_q_)+H_2O \rightarrow 2 NaOH + CO_2}[/tex]
Hence we can conclude that in water, Sodium carbonate dissociates to form Sodium hydroxide and carbon dioxide.
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Which figure is the percent of energy at which one trophic level generally flows to the next level?
1)10%
2)35%
3)50%
4)100%
About 10% of the energy at one trophic level is transferred to the next, with the rest being used for metabolism or lost as heat, explaining why there are typically no more than four trophic levels in a food chain. Hence option A is correct.
The figure that represents the percent of energy transferred from one trophic level to the next is generally about 10%. Energy is passed up a food chain or web from lower to higher trophic levels, and it is depicted by an energy pyramid. The other 90% of the energy is used for metabolic processes or given off to the environment as heat. This significant loss of energy at each step explains why typically there are no more than four trophic levels in a food chain or web, because there isn't enough energy left to support more levels.Hence option A is correct.
which property determines how well a solid resists breaking? strength hardness stress strain
What is the empirical formula of the phosphorus selenide?
Final answer:
The empirical formula of phosphorus selenide is represented as P₂Sen, where 'n' is the number of selenium atoms bonded to two phosphorus atoms. Specific stoichiometry is needed for an exact formula.
Explanation:
The empirical formula of a compound represents the simplest whole-number ratio of the elements within that compound. For phosphorus selenide, we need to look at the actual stoichiometry of the compound to determine its empirical formula. Without specific information on the stoichiometry, we cannot give an exact empirical formula. However, some known phosphorus selenides include P₂Se₃ and P₂Se. To generalize, an empirical formula for phosphorus selenide could be P₂Sen, where 'n' represents the number of selenium atoms that bond with two phosphorus atoms.
"what would be the molecular formula for a polymer made from eight glucose (c6h12o6) molecules linked together by dehydration reactions?"
Aluminum metal reacts with dilute sulfuric acid to produce aluminum sulfate and hydrogen gas. what mass of aluminum will react with 5.890 g of sulfuric acid
Answer:
Aluminium reacts with dilute sulfuric acid based on the following reaction:
2Al + 3H2SO4 ..............> Al2 (SO4)3 + 3H2
From the periodic table:
mass of aluminium = 27 grams
mass of hydrogen = 1 gram
mass of oxygen = 16 grams
mass of sulfur = 32 grams
Therefore:
molar mass of aluminium = 27 grams
molar mass of sulfuric acid = 2(1) + 32 + 4(16) = 98 grams
From the balanced chemical equation:
2 moles of aluminium react with 3 moles of dilute sulfuric acid.
This means that 34 grams of Al react with 294 grams of the acid
To get the amount of aluminium that reacts with 5.890 g of sulfuric acid, we will do cross multiplication as follows:
amount of Al = (5.890 x 34) / 294 = 0.6811 grams
Explanation:
Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron?
One mole of any substance is equal to Avogadro’s number, 6.023 x 10²³
A mole of magnesium = a mole of iron = Avogadro’s number, 6.023 x 10 ²³
One mole of any element contains 6.023 x 10²³ number of atoms.
One mole of any substance contains 6.023 x 10²³ number of atoms, molecules, ions, or formula units.
What is the relationship between an element's atomic mass and an element's isotopes?
The relationship between an element's atomic mass and an element's isotopes is that they have the same number of protons in their respective nuclei.
Isotopes are those atomic species of the same element that differs in the number of nucleons in their nucleus.Isotopes differ in mass numbersProtons and neutrons are collectively called nucleons.They have the same number of protons as that of the parent atom in their respective nuclei.They have a different number of neutrons in their nucleus.So, from this, we can conclude that the relationship between an element's atomic mass and an element's isotopes is that they have the same number of protons in their respective nuclei.
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What is the empirical formula for propene (C3H6)?
Answer:
CH2
Explanation:
Divide by 2 and you get the answer
a group of students wants to see how temperature affects the time it takes for spilled water to dry up in the investigation what will be the dependent and independent variables
_____ is the degree of attraction of one atom for the valence electrons of another atoms. Electronegativity Ionization energy Covalent bonding Ionic bonding
Is glucose a solution colloid or suspension?
For a neutral atom, the number of ____ is also equal to the atomic number.
In a neutral atom, the number of protons equals the atomic number, which also indicates the same number of electrons.
Explanation:For a neutral atom, the number of protons is also equal to the atomic number. Atoms are neutral in electrical charge because they have the same number of negative electrons as positive protons. Therefore, the atomic number of an atom also tells you how many electrons the atom has. For instance, hydrogen has an atomic number of 1, which means it has 1 proton and 1 electron. Manganese, with an atomic number of 25, has 25 protons and also 25 electrons when neutral. The atomic number not only signifies the number of protons in an atom but also, by default, the number of electrons in a neutral atom.
How many atoms of each element are in the chemical formula P2O5?
Answer:
There are two P (phosphorous) atoms and five O (oxygen) atoms.
Explanation:
The subscripts of each element represent the number of atoms of that element in the molecule.
Atom is the smallest unit of matter. An element is made of identical atoms.
A molecule is made up of more than one different element. And there are more than one atoms of each element in the molecule.
What percentage of a radioactive species would be found as daughter material after six half–lives?
When a student adds benedict’s solution to a clear solution, the solution turns orange. the student can conclude that the solution has a high concentration of which biomolecule?
Answer:
Answer:
(an open) (30) (greater than 30) ( 40
Explanation:
i am smart
Brainly why is carbon so special compared to other elements?
a. carbon atoms can bond to one another and form a lot of different structures.
b. only carbon atoms can form covalent bonds with oxygen and hydrogen.
c. only carbon atoms can be dissolved in water solutions and suspensions.
d. carbon atoms have four valence electrons and can form quadruple bonds.
Your answer would be A. Hope this helps!
The speciality of carbon arises from its ability to form multiple covalent bonds and create complex structures, which are fundamental to organic compounds and therefore, to life. It's the base for a range of compounds due to its bonding capacity with varying elements.
Explanation:Carbon is special compared to other elements mainly because of its ability to form various structures through covalent bonds, thanks to its four valence electrons. This characteristic enables carbon atoms to bond together forming long chains, or other complex structures, known as carbon skeleton, which is the fundamental feature of organic compounds. However, carbon atoms do not form quadruple bonds and can bond not just with hydrogen and oxygen, but with other elements as well.
Carbon in Organic Compounds:
Organic compounds, which are the basis of life, contain carbon skeletons and hydrogen. Carbon's ability to form covalent bonds with hydrogen, oxygen, and other elements is essential to the diverse structures and functions of these compounds. Also, while carbon can indeed be dissolved in water solutions, so can many other elements.
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which of the following is a chemical property ?
A. Ability to conduct heat
B. Ability to become magnetic
C. Ability to react with acid
D. Ability to conduct electricity
The ability to react with acid is a type of chemical property, therefore the correct answer is option C.
What is a chemical reaction?A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products.
There are differences between the chemical and physical properties of any material.
The ability to react with acid is a type of chemical property,
While on the other hand ability to conduct heat, the ability to become magnetic, and the ability to conduct electricity are the physical properties of any material.
Thus, the ability to react with acid is a type of chemical property the correct answer is option C.
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