Answer:
4 significant figures as zeros after decimal should not be counted
Explanation:
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Answer:
4 significant figures
Which of the following are characteristics of atoms and molecules in the gaseous state?
1. They expand as the temperature is increased.
II. They are compressible.
III. They have high densities.
IV. They are miscible.
e. I, II, and IV
a. I and II
b. I, II, and III
C. I and IV
d. I and III
I and III are characteristics of atoms and molecules in the gaseous state.
Hence, option D is correct.
What is an atom?An atom is any particle of matter which contains at least one proton.
The gas expands as the temperature increases and has high densities.
The temperature of a gas will increase and the density will decrease as it
expands.
The expansion of gas occurs as a result of an increase in the elastic
collision of the atoms.
This is a result of the increase in temperature which causes the atoms to be more spatially arranged.
The density of gas also reduces as a result of the same number of gas
molecules occupying more volume.
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Final answer:
Gasses expand as temperature increases, are compressible, and are miscible, but do not have high densities. The answer to the characteristics of gaseous atoms and molecules is e. I, II, and IV.
Explanation:
Atoms and molecules in the gaseous state exhibit several characteristic properties. Firstly, they expand as the temperature is increased. This expansion is due to the increased kinetic energy of the gas particles, causing them to move further apart. Secondly, gases are indeed compressible because of the large amount of space between the gas particles, which can be reduced under pressure. However, they do not have high densities; gases are much less dense than solids or liquids. Finally, gases are miscible, meaning they can mix together to form a homogeneous mixture, like air, which is a mixture primarily of nitrogen and oxygen.
Taking these points into consideration, the correct answer to the student's question about the characteristics of atoms and molecules in gases would be options I (They expand as the temperature is increased), II (They are compressible), and IV (They are miscible). Therefore, the answer is e. I, II, and IV.
Which kind of weather usually forms over the northwest United States in the summer because of maritime polar air masses?
1 )fog
2)dry heat
3) heavy snow
4) heavy rain
Answer:
1 )foggy.
Explanation:
As air mass is a large body of air that remains stable over the area for a larger period like days or weeks it produces heat exchange on land and as well on waters. As maritime polar air masses (M.P) are cool and moist hence they bring cloudy and damp weather to the USA covering the northern Atlantic and Northern Pacific oceans, mostly influenced by the pacific northwest and northeast air masses. They can form any time of the year and are not as cold as the continental polar air masses.how many molecules of water are in 345g
Answer:
1.15 molecules
Explanation:
To get to molecules, you need to first convert grams into moles, then moles into molecules.
345g of water x [tex]\frac{1 mol }{18.02g}[/tex]
This will get you the moles of water. (The number 18.02 came form the molar mass of water which is H2O)
I MOLE EQUALS AVOGADRO'S NUMBER
19.15 mol of water x[tex]\frac{6.022*10^{23}molecules }{1 mol}[/tex]
= 1.15
Answer:
There are [tex]1.1542\times 10^{25} [/tex] molecules of water are in 345 grams.
Explanation:
[tex]n=\frac{m}{M}[/tex]
[tex]N=n\times N_A[/tex]
Where:
m = mass of compound
M = Molar mass of compound
N = Number of particles / atoms/ molecules
n = Number of moles
[tex]N_A=6.022\times 10^{23} mol^{-1}[/tex] = Avogadro's number
Mass of water = m = 345 g
Molar mas of water = M = 18 g/mol
[tex]n=\frac{345 g}{18 g/mol}=19.167 mol[/tex]
Number of molecules of water = N
[tex]N=19.167 mol\times 6.022\times 10^{23}mol^{-1}[/tex]
[tex]N = 1.1542\times 10^{25} molecules[/tex]
There are [tex]1.1542\times 10^{25} [/tex] molecules of water are in 345 grams.
define molecules as it relates to molecular substances and compounds
Answer:
molecules are 2 atoms held together by chemical bonds, compunds are 2 atoms from more than one element held together by chemical bonds.
Molecule is the combination of two or more different atoms and Group of similar molecules forms compound.
What are the properties of a Molecule ?
Molecule is an electrically neutral group of two or more atoms held together by chemical bonds.
A molecule is the smallest particle into which an element or a compound can be divided without changing its chemical and physical properties.
Therefore, Molecule is the combination of two or more different atoms and Group of similar molecules forms compound.
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Both amines and amides are derivatives of ammonia. True False
It is true that both amides and amine are the derivatives of ammonia.
Explanation:Amines are the derivatives of ammonia [tex]\text{(NH_3)}[/tex] where nitrogen atom makes bond to 1, 2, or 3 alkyl or aromatic groups of compounds. Amides are the amino group [tex]\text{(-NH_2)}[/tex], which is derived from ammonia, replaces the hydroxyl group [tex]\text{(-OH)}[/tex] in a carboxylic acid.
The simplest amides are the proper derivation of ammonia whereas the higher degree amides are the derivation of secondary amine.
The statement is correct. Amines and amides are in fact derivatives of ammonia. Amines are derived from ammonia by replacing hydrogen atoms by alkyl or aryl groups, while amides are derived by replacing one hydrogen with an acyl group.
Explanation:Yes, the statement is correct. Amines and amides are indeed derivatives of ammonia.
Amines are organic compounds which are derived from ammonia by replacing one or more hydrogen atoms by alkyl or aryl group. For example, methylamine CH3NH2 is an amine where one hydrogen atom is replaced by a methyl group.
Amides, on the other hand, are organic compounds derived from ammonia by replacing one hydrogen atom by an acyl group. An example of an amide is acetamide CH3CONH2 where one hydrogen atom of ammonia is replaced by an acetyl group.
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How many liters of oxygen gas, at standard
temperature and pressure, will react with 35.8 grams of
iron metal?
4 Fe (s) + 3 O2 (g) → 2 Fe2O3 (s)
Answer:
Explanation:
For the balanced reaction:4Fe(s) + 3O₂(g) → 2Fe₂O₃(s).
It is clear that 4 mol of Fe react with 3 mol of O₂ to produce 2 mol of Fe₂O₃.
Firstly, we need to calculate the no. of moles of 35.8 grams of Fe metal:no. of moles of Fe = mass/molar mass = (35.8 g)/(55.845 g/mol) = 0.64 mol.
Now, we can find the no. of moles of O₂ is needed to react with the proposed amount of Fe:Using cross multiplication:
4 mol of Fe is needed to react with → 3 mol of O₂, from stichiometry.
0.64 mol of Fe is needed to react with → ??? mol of O₂.
∴ The no. of moles of O₂ needed = (3 mol)(0.64 mol)/(4 mol) = 0.48 mol.
Finally, we can get the volume of oxygen using the information:It is known that 1 mole of any gas occupies 22.4 L at standard P and T (STP).
Using cross multiplication:
1 mol of O₂ occupies → 22.4 L, at STP conditions.
0.48 mol of O₂ occupies → ??? L.
∴ The no. of liters of O₂ = (0.48 mol)(22.4 L)/(1 mol) = 10.752 L.
The density of iron is 7.8 g/cm3 and that of aluminum is 2.7 g/cm3. Using a balance, you find that a block of iron has the same mass as a block of aluminum. Which block has the LARGER volume?
Question 15 options:
You cannot tell from the information given.
The volumes are the same.
The iron block
The aluminum block
2.) As water in an ice cube tray freezes,
Question 23 options:
it absorbs energy from its surroundings.
its surroundings absorb energy from it.
it absorbs coldness from and releases energy to its surroundings.
it only absorbs the coldness from its surroundings.
it neither absorbs nor releases energy, because its temperature stays constant.
Answer:
1.The Aluminum block
2.its surroundings absorb energy from it.
Explanation:
In this question it is important to remember that density of an object is the mass of that object divided by its volume.
The expression applied here is density=mass/volume
Given that the mass is constant,lets say mass= m=1g
and density of aluminum=2.7g/cm³ and that of iron is 7.8 g/cm³ then volume=?
Volume=mass/density
Volume of aluminum= 1/2.7 =0.3704 cm³
Volume of iron = 1/7.8 =0.1282 cm³
Here we see volume of Aluminum block is the largest.
2.As water in an ice cube tray freezes, its surroundings absorb energy from it.When the water freezes, latent heat of freezing is given out to the surrounding.When water is freezing, it stays at a constant temperature of 0°C, the heat energy released ensures that there is no cooling past 0 °C.
Transportation is the largest single source of air pollution in the United States. Air pollution can harm the environment and human health. Which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage
Answer:
- motors that run on electricity
- tires that improve gas mileage
Explanation:
The transportation is a major polluter of the air. The big problem with it is that it is necessary for the humans to be able to live and function properly, as the trade is happening through it, thus it is crucial for the economy. In order to stop or reduce the negative impact on the air quality, there are some solutions which can help. The motors that can run on electricity are an excellent method, as the production of electricity is not polluting the are as the fossil fuels are. The only problem is that this type of motors are still very expensive, so once their price is on pair with the combustion motors they can be used. Tires that are able to increase the efficiency of the transportation means can also be useful, as they will be able to reduce the amount of pollutants released into the atmosphere, because the transportation will use less fossil fuels for the same mileage.
Answer:
Explanation:
Under the sector of transportation passenger vehicles are the major contributor to the pollution. Emission from cars and two-wheeler is the leading cause of increasing level of carbon dioxide, sulfur content and other greenhouse gases.
Solution to this problem include:
Increase in usage of electric vehicles as seen in Norway.Better tires which can improve the fuel mileage.Encourage usage of public transport.During which months do both the northern and Southern Hemisphere receive the same amount of energy from the sun
Answer:b
Explanation:
Answer:
March and September
Explanation:
During equinox, which occurs every year approximately on 21st March and on 22nd September, the day length and the night length are both 12 hours. This happens because the sun is directly overhead the equator. As a consequence both Hemispheres receives the same amount of energy from the Sun.
Which of the following fossils are trace fossils?
Trace fossils may consist of impressions made on or in the substrate by an organism: for example, burrows, borings, footprints and feeding marks, and root cavities. Trace fossils contrast with body fossils, which are the fossilized remains of parts of organisms' bodies, usually altered by later chemical activity or mineralization.
Hope this helps! :D
Answer:
footprint
Explanation:
I know you can choose more than one anwer but that it is the only answer that makes sense
How many moles of HCI would be required to produce a total of 2 moles of H2
Answer:
Should be 4 moles.
What does the symbol H stand for
Answer:
enthalpy
Explanation:
If it is used with a triangle in front, (delta H), that means the change in enthalpy. Delta H= (m)(s)(Delta T). m=mass of products, s=heat of the products, Delta T = change in temperature.
Hope that helps
What is enthalpy? the total concentration of the system the total heat content of the system the total pressure of the system the total internal energy of the system
Answer:
The total heat content of the system.
Explanation:
Enthalpy is a thermodynamic quantity equivalent to the total heat content of a system.Enthalpy is equal to the system's internal energy plus the product of its pressure and volume. In a system enclosed so as to prevent matter transfer, for processes at constant pressure, the heat absorbed or released equals the change in enthalpy.So, the right choice is: The total heat content of the system.
which is a characteristic of mixtures?
Answer:
The correct answer is "They can be separated by physical processes"
Explanation:
The definition of Mixtures is the blending of two or more dissimilar substances.
Mixtures can be divided into those that are homogeneous or heterogeneous meaning that they can be distributed evenly or can't be distributed evenly.
How does the atmosphere help to make Earth livable? Check all that apply.
causes the seasons
contains oxygen
provides warmth
creates important nutrients
blocks harmful energy from the Sun
Plz help like ASAP!!!
Answer:
- contains oxygen
- provides warmth
- blocks harmful energy from the Sun
Explanation:
The atmosphere is crucial when it comes to providing living conditions on Earth. The gases in the atmosphere manage to balance the things just about right, so that the life can thrive. The atmosphere has oxygen, the gas that is used by pretty much every organism to be able to function. With its greenhouse gases, the atmosphere manages to trap the heat inside, thus providing warmth to the Earth. The numerous layers of the atmosphere manage to block in big portion the harmful energy from the Sun, with a special accent on the ozone layer, a layer that manages to stop most of the UV radiation.
Answer: Contains oxygen, provides warmth, blocks harmful energy from the Sun
Explanation:
it they main important to live on earth
Chemical reaction to distinguish 1 butyne and 2 butyne
Answer:
1-butyne and 2-Butyne are distinguished by : -
"Tollins reagent test ".
1-butyne gives tollins reagent test but 2-Butyne doesn't.
Explanation:
You can Refer to attachment.
A student will measure and record the growth of two flowering plants every day for 28 days. Plant A will be watered and fertilized, Plant B will only be watered. The student predicts fertilizer added to the soil leads to taller flowering plants. Scientific conclusions are based on scientific evidence, what evidence would support the student’s prediction?
Answer:
If Plant A grows taller than Plant B
Explanation:
because plant A is being fertilized whereas plant B isn't
Which structural formula represents a molecule that is not an isomer of pentane?
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н-с-с-с-с-н
ннннн
н-с-с-с-с-с-н
н нннн
н
н-с-н
н-с-с-с-н
н- с-н
Hн
II-0-І І
——-т
х-О-ІІ
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An isomer of pentane has the same molecular formula but different structure. Pentane has three isomers. Structural formula H-C-C-C-H represents propane, which is not an isomer of pentane due to having a different molecular formula.
Explanation:An isomer is a compound with the same molecular formula but a different structure. Pentane is an organic compound with the molecular formula C5H12 and has three isomers. These isomers are 2-methylbutane (also known as isopentane) and 2,2-dimethylpropane (also known as neopentane).
The structural formula that does not represent an isomer of pentane would be the one with a different molecular formula such as H-C-C-C-H which represents propane, a hydrocarbon with the molecular formula C3H8. Propane is not an isomer of pentane as it has a different molecular formula hence a different number of carbons and hydrogens.
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Complete the paragraph to describe the characteristics of a silicon tetrahydride molecule (SiH4). The Lewis structure and table of electronegativities are given.
The bond polarities of SiH4 are , the molecular shape is , and the molecule is .
Answer:
PLATO: Polar, Tetrahedral, NonPolar
Explanation:
A fish has armored plates that enable it to handle the extreme pressure in the deepest, darkest aquatic ecosystem.
Where is this fish adapted to live?
Answer:
the open ocean
Explanation:
i just took the test on edge
An electron has _____.
far less mass than either a proton or a neutron
more mass than a proton or a neutron
no mass at all
about the same mass as a proton or a neutron
Answer:
Your answer is A. far less mass than either a proton or a neutron
I am 10000% sure this is correct
hope this helps ya
:D plz mark me brainiest
Answer:
the answer is a
How many moles of potassium are needed to react completely with 12.8 moles of magnessium bromide?
Final answer:
To fully react with 12.8 moles of magnesium bromide in a single displacement reaction, 25.6 moles of potassium are needed, based on a typical reaction where 2 moles of potassium react with 1 mole of magnesium bromide.
Explanation:
To answer the question, of how many moles of potassium are needed to react completely with 12.8 moles of magnesium bromide, we need to reference the chemical equation that describes the reaction between potassium (K) and magnesium bromide (MgBr₂). However, without the specific reaction provided, a direct stoichiometric relationship is difficult to establish. For simplicity, let's assume a common type of reaction where potassium displaces magnesium from magnesium bromide, which is a single displacement reaction.
In a typical displacement reaction, potassium would react with magnesium bromide to form potassium bromide (KBr) and free magnesium (Mg). The equation might look something like 2 K + MgBr₂ → 2 KBr + Mg. Here, you can see that 2 moles of potassium react with 1 mole of magnesium bromide. Therefore, to react with 12.8 moles of MgBr₂, you would need 2 times that amount of potassium because the molar ratio of K to MgBr₂ is 2:1.
So, 25.6 moles of potassium are needed to react with 12.8 moles of magnesium bromide. It's important to remember that this answer is based on the assumption of a specific reaction type, and actual reactions may vary.
If an atom has 12 protons and 13 neutrons
Answer:
MAGNESIUM
Explanation:
The element with the atomic number 12 is magnesium if an atom has 12 protons and 13 neutrons.
What is a proton?A proton is a subatomic particle found in the nucleus of every atom.
The mass number of an isotope is the sum of the protons and neutrons in its atomic nuclei. And it is given that an atom has 12 protons and 13 neutrons. So we need to find out the atomic number of the atom.
If we know the mass number (A) and the number of neutrons (N), we can calculate the atomic number (Z) by subtracting the number of neutrons from the mass number.
A−N=Z
25−13=12
The atomic number of the element is 12.
Atomic number is the number of protons in the nuclei of all atoms of an element.
The element with the atomic number 12 is magnesium.
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Which of these discoveries contradict components of Dalton’s atomic theory? Check all of the boxes that apply.
Atoms contain smaller particles: protons, neutrons, and electrons.
Atoms of a given element can bond to other atoms only in specific ways.
Atoms of a given element can have different numbers of neutrons.
Nuclear reactions can change an atom of one element into an atom of another element.
All atoms of a given element have the same number of protons.
Answers:
Nuclear reactions can change an atom of one element into an atom of another element. ( fourth choice)
Atoms contain smaller particles: protons, neutrons, and electrons.( first choice)
Atoms of a given element can have different numbers of neutrons.( third choice)
Answer:
Atoms contain smaller particles: protons, neutrons, and electrons.
Atoms of a given element can have different numbers of neutrons.
Nuclear reactions can change an atom of one element into an atom of another element.
All atoms of a given element have the same number of protons.
Explanation:
Electrons, protons, and neutrons, and isotopes had not yet been discovered.
The only statement that agrees with Dalton's atomic theory is
B. Atoms of a given element can bond to other atoms only in specific ways. Dalton used this postulate to formulate the Laws of Definite Composition and of Multiple Proportions.
What is the concentration, in grams per liter, of a solution prepared by dissolving 0.00040 mol HCl in 2.2 L H2O? Assume that the volume of the solution does not change when the HCl is added.
Answer:
0.00663 grams/liter
Explanation:
HCl is a mineral acid with a molar mass of 36.46 g/mol.
No. of moles= mass/RMM
Making mass the subject of the formula:
Mass=Number of moles × RMM
Therefore 0.00040 mol HCl has a mass of:
0.00040 mol × 36.46 g/ mol
=0.01458 grams.
0.01458 grams are in 2.2 liters, Therefore 1 liter will have
0.01458 grams/2.2 liters= 0.00663 grams
concentration= 0.00663 grams/liter
Answer:
the answer is 0.00663 grams/liter
Explanation:
trust me bro, im asian
1s22s22p63s23p64s23d104p5 Which element is this?
Explanation:
As the given electronic configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}[/tex]. This shows that there are in total 35 electrons and 7 valence electrons.
Also, we know that bromine is the element that has atomic number 35. And, since it belongs to group 17 so it has 7 valence electrons.
Thus, we can conclude that the given element is bromine.
The element with the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵ is Bromine. This can be deduced by counting the total number of electrons, which is 35. Bromine is in Group 17 and Period 4.
The element with the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵ is Bromine (Br). To determine this, you can count the total number of electrons, which add up to 35. Bromine is located in Group 17 (VIIA) and Period 4 of the periodic table.
Here is a breakdown of the electron configuration:
1s²: 2 electrons2s² 2p⁶: 8 electrons3s² 3p⁶: 8 electrons4s² 3d¹⁰ 4p⁵: 17 electronsAdding these up results in a total of 35 electrons, confirming it is Bromine.
Complete Question - What is the element with the following electron configuration? 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
Why should the scientific method be used to answer a question?
A. It provides a way to test an idea without any bias.
B. It provides a way to test a hypothesis.
C. It provides a way to ensure all hypotheses are proven correct.
D. It provides a way to quickly turn a hypothesis into a scientific
theory.
Answer:
B
Explanation:
The whole method is a step by step way to testing a hypothesis.
The scientific method is used to answer a question and it provides a way to test a hypothesis. Hence, option B is correct.
What is a hypothesis?A hypothesis in a scientific context is a testable statement about the relationship between two or more variables or a proposed explanation for some observed phenomenon.
To test the hypothesis, we need to make an observation or perform an experiment associated with the prediction.
The Scientific Method helps you put together experiments, use data to find conclusions and interpret them.
Hence, It provides a way to test a hypothesis.
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in the balanced reaction nh3 + h2o - nh3oh how many hydrogen atoms are gained in the reaction
A) 3
B) 2
C) 5
D) 0
Answer:
0
Explanation:
If you mix NH3 and H2O the reaction is NH3 + H2O → NH4OH not NH3OH.
Te equation, like that is balanced. There is 1 N, 5H and 1 O in the reactives and 1 N, 5 H and 1 O so you have the same number of elements in the reactives and products, thus it's balanced and you don't need to do anything
This type of questions is relationed with REDOX balanced
If a stack of 1,008 alkali fuel cells in series generates 14,800 W of power, and each cell contributes equally to the power of the stack, how much power does each cell contribute? (Write the answer to one decimal place.)
Answer:
I got 14.7 W each
14,800 divided by 1,008 is 14.682539 which is 14.7 to 1dp. Sorry if this is wrong.
Answer: 14.7
Explanation: I got it correct.
35. In the collision theory, a collision that leads to the formation of products is called an
_.(2 words)
Answer:
It's Effective Collision.
Explanation:
Hope my answer has helped you!