What observation led Bohr to believe that electrons had certain, finite, discrete, EXACT amounts of energies and thus were on quantized energy levels?
planck's equation E = h x v is used to determine which of the following?
What is a solid in which electrons are able to move about easily from one atom to another?
Which describes the reaction of a substance to form one or more new substances? a physical change a change of state a chemical change?
Chemical change would be the answer.
Identify the mass law that each observation demonstrates. a flashbulb contains magnesium and oxygen before use and magnesium oxide afterward, but its mass does not change.
The name of the commonly used hardness scale is:
specific gravity
organic
Mohs
inorganic
Answer: Option (c) is the correct answer.
Explanation:
Mohs scale is used to determine the hardness of a material or substance.
This scale includes ten materials and each of them are placed according to their hardness from bottom to top as follows.
Talc = 1Gypsum = 2Calcite = 3Fluorite = 4Apatite = 5Orthoclase = 6Quartz = 7Topaz = 8 Corundum = 9Diamond = 10Greater is the number, the hardest will be the substance, that is, according to Mohs scale diamond is the hardest substance and talc is the least hardest substance.
Thus, we can conclude that option (c) is the correct answer.
Name an element that has similar to silver in the periodic table
Elements which have similar properties to silver are copper and gold as they are present in the same group.
Why are properties similar along a group?Properties depend on the number of valence electrons an element possesses.Elements in the same group have the same number of valence electrons as for every new element in a group a new shell is added, although the number of valence electrons is same.
Since, the number of valence electrons for all elements in a group is same ,elements in the group have similar properties.Only the size of the atom increases down the group as a successive shell is added for every element which increases the distance between valence shell and nucleus.
The reactivity of elements depends on distance between valence electrons and nucleus.On moving down the group , reactivity increases as the distance between valence shell and nucleus increases.
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Are compounds pure substance containing two or more elements that are chemically combined
Henri Becquerel and the Curies found out that _____.
atoms were not indivisible and indestructible
the atom had a nucleus
there was a lot of empty space in the atom
atoms were very small
Henri becquerel and the curies found out that:
atoms were not indivisible and indestructible
Explanation:
The French Physicist, Henri Becquerel, created the appearance of radioactivity. He shared the Nobel Prize in Physics with Marie Curie and Pierre Curie (Marie's husband) in 1903 for their work in radiation. A radionuclide will emit transmission through the process of radioactive sense.
A chemical engineer has determined by measurements that there are 0.040 moles of carbon in a sample of methyl tert-butyl ether. how many moles of oxygen are in the sample?
Which bond from each set is the longest N-O or N=O
Answer:
N-O is longer
Explanation:
Length of a covalent bond decreases with increase in electron density between two bonded atoms. Because increase in electron density produces more negative charge density between two bonded atoms. Hence this negative charge density strongly attract positively charged bonded nucleus towards itself.Electron density in a covalent bond increases if there exists pi bond along with a sigma bond. Higher the number of pi bonds, higher will be electron density.Therefore bond in N=O is more electron dense. Hence N=O bond is shorter and N-O is longer.What volume will 5.1×1022 atoms of ne occupy at stp?
First let us calculate the number of moles of Ne using Avogadros number.
number of moles = 5.1×10^22 atoms * (1 mole / 6.022x10^23 atoms)
number of moles = 0.08469 mole
At STP, a gas would occupy 22.4L/mole
V = (22.4L/mole) * 0.08469 mole
V = 1.90 L
5.1 × 10²² atoms of neon occupy approximately 1.9 liters at standard temperature and pressure (STP).
The calculation involves converting atoms to moles using Avogadro's number and then using the molar volume of 22.4 liters per mole.
The volume of Neon Gas at STP:
To find the volume occupied by a given number of atoms of neon (Ne) at standard temperature and pressure (STP), we can use the concept of molar volume. At STP, 1 mole of any ideal gas occupies 22.4 liters.
First, we need to determine the number of moles of neon corresponding to 5.1 × 10²² atoms of neon. Avogadro's number (6.022 × 10²³ atoms/mole) allows us to convert between atoms and moles:
Moles of Ne = (5.1 × 10²² atoms) / (6.022 × 10²³ atoms/mole) ≈ 0.0847 moles
Next, we use the molar volume of an ideal gas at STP to find the volume:
Volume (V) = moles of Ne × molar volume at STP
V = 0.0847 moles × 22.4 L/mole ≈ 1.9 liters
Therefore, 5.1 × 10²² atoms of neon will occupy approximately 1.9 liters at STP.
In group 13, the only metalloid, boron, is at the very top of the group. Explain why the rest of the group has mettalic behavior but boron doesnt
Answer:
Boron is electron-deficient, possessing a vacant p-orbital.
Explanation:
Boron is the only non-metal of the group 3A or group 13 of the periodic table the elements. All group 3A member elements are electropositive ( they have the tendency to loose electron in chemical reactions).
Boron is electron-deficient and possesses a vacant p-orbital. Also, Boron is the least electronegative non-metal, so it readily loses electrons when reacting.
Although, Boron is not a complete non-metal, it is metalloid (that is, boron has the characteristics of metals and non-metals).
Boron can exist in the crystalline form and amorphous form.
The group 3A or group 13 consist of Boron, Aluminum, Gallium, Indium and Thallium. All the elements have 3 valence electrons
Which of the following statements does not describe a chemical property of oxygen:
1)Oxygen combines with carbon to form carbon dioxide gas
2) When coal is burned in oxygen, the process is called combustion
3)Iron will rust in the presence of oxygen
4)The pressure is caused by collision of oxygen molecules with the sides of a container
What is the name of the molecular compound that has the formula P2S5
The molecular compound with the formula P₂S₅ is named diphosphorus pentasulfide. Phosphorus is written first as it is less electronegative than sulfur.
The name of the molecular compound with the formula P₂S₅ is diphosphorus pentasulfide. In naming such compounds, the prefix 'di-' indicates the presence of two phosphorus atoms and the prefix 'penta-' indicates the presence of five sulfur atoms.
The rules for naming molecular compounds involve using prefixes to denote the number of atoms. The element written first is generally the one that is less electronegative, in this case, phosphorus. Therefore, the compound P₂S₅ is named diphosphorus pentasulfide.
Is a dilute solution of copper ii sulfate in water homogeneous or heterogeneous?
If two objects have the same mass, what must be true? choose the correct answer A. They have the same volume B. They are made of the same material C. they contain the same amount of matter D. They have the same density
If two objects have the same mass, it means they contain the same amount of matter.
Explanation:The correct answer is C. they contain the same amount of matter.
If two objects have the same mass, it means they have the same amount of matter. Mass is a measure of the amount of material within an object, and objects with the same mass have the same quantity of atoms and molecules. The other options, such as volume, material, and density, can vary between objects with the same mass.
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What is the most striking part of this simulation?
What can be said about the polarity of water?
If you have a substance, would it have the same density no matter what mass of the substance you have?
Which equation will you use to calculate the volume of a 5.00 liter sample of air at 50°C when it is warmed to 100°C at constant pressure?
Answer : The final volume of gas will be, 5.77 liters
Explanation :
Charles' Law : It is defined as the volume of the gas is directly proportional to the temperature of the gas at constant pressure and number of moles.
[tex]V\propto T[/tex]
or,
[tex]\frac{V_1}{V_2}=\frac{T_1}{T_2}[/tex]
where,
[tex]V_1[/tex] = initial volume of gas = 5.00 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = [tex]50^oC=273+50=323K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]100^oC=273+100=373K[/tex]
Now put all the given values in the above formula, we get the final volume of the gas.
[tex]\frac{5L}{V_2}=\frac{323K}{373K}[/tex]
[tex]V_2=5.77L[/tex]
Therefore, the final volume of gas will be, 5.77 liters
You have three molecules of glucose (3C^6H^12O^6). How many carbon atoms do you have?
What would happen if there was an increase in the amount of fossil fuels burned?
Which states of matter have particles that move independently of one another with very little attraction?
A) gas and plasma
B) liquid and gas
C) solid, liquid, and gas
D) liquid, gas and plasma
the answer is a- gas and plasma. i took it on usa test prep.
Answer:
A) gas and plasma
Explanation:
Can you help me with these 5 questions 5 pts each
Are criminals rational decision makers, or are most of them motivated by uncontrollable psychological and emotional drives or social forces such as poverty and despair?
Final answer:
Economic models suggest criminals conduct a cost-benefit analysis before committing crimes, yet factors like poverty and desperation also drive criminal behavior, complicating the idea of purely rational criminal decision-making.
Explanation:
The question of whether criminals are rational decision makers or driven by other factors such as psychological, emotional, and social forces is complex. Economic models of criminal behavior suggest that criminals weigh the benefits of a crime against its costs in a rational manner. However, individuals may also commit crimes due to poverty, desperation, or social environment, which indicates that not all criminal behavior is the result of a logical cost-benefit analysis. Factors such as poverty, lack of opportunity, and individual personality traits play significant roles in influencing criminal behavior.
Moreover, the opportunity cost of time is an important consideration; individuals choose to engage in crime when the potential gains are seen as outweighing the gains from legal activities. Nonetheless, the sociological perspective considers the broader impact of laws and whether certain legal frameworks may cause more harm than good, suggesting a need for a more nuanced understanding of criminal activity.
The phosphate functional group in the non cyclic amp molecule of question 21 contains "acidic hydrogens"
Atoms that have lost or gained one or more electrons are called ________.
The appropriate mixing ratio for a solution to kill bloodborne pathogens is 1 part chlorine to 10 parts water. If you are mixing a solution in a spray bottle with 15 ounces of water, how much chlorine do you need to add for the correct ratio
Answer:
1.5 ounces of chlorine is needed.
Explanation:
Ratio of the solution = 1 part chlorine: 10 parts water
let the volume of chlorine required to make the solution be x
Volume of the water used on solution = 15 ounces
Ratio of chlorine to water will remain equal to the 1 part chlorine to 10 parts water:
[tex]\frac{x}{15 ounces}=\frac{1}{10}=1.5 ounces[/tex]
1.5 ounces of chlorine is needed.
If three molecules of hydrogen react with one molecule of nitrogen how many molecules of ammonia would be formed?
Answer : The number of molecules of ammonia formed would be, 2.
Explanation :
As per question, when the hydrogen molecule react with nitrogen molecule then it gives ammonia as a product.
The balanced chemical reaction will be :
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
By the stoichiometry we can say that, 1 mole of nitrogen gas react with 3 mole of hydrogen gas to give 2 mole of ammonia gas as product.
The number of molecules of nitrogen gas = 1
The number of molecules of hydrogen gas = 3
The number of molecules of ammonia gas = 2
Therefore, the number of molecules of ammonia formed would be, 2.