Answer:
Sound is vibrations that travel through a medium, and which are then converted into electrical signals by our brain so that we interpret them as a noise that we hear. These vibrations consist of particles colliding with each other (this is why sound cannot travel through space; there are no particles). At warmer temperatures, the particles that make up air will move faster, so these collisions will happen more frequently. Therefore the vibrations occur more quickly, so sound travels faster and reaches our ears in a shorter amount of time.
The speed of sound can travel faster in hot air than it can in cold air. This is because the molecules of air can move even faster and the vibrations of the sound wave can transmit faster. Sound is a type of mechanical wave, meaning that it requires a medium to transmit energy. Mediums are any substance that has mass and takes up space, from the air in the room to the metal atoms in an iron fence.
Explanation:
hope that helps :)
Answer:
Sound travels faster in a warm room because temperature affects the speed of a wave. In a warm room, the particles of air move faster and have higher chances of bumping into each other, which then increases the instances of energy transfer.
Explanation:
just trust me cuz
How many moles of carbon dioxide (CO2) does 250 grams of the substance have? How many
molecules of CO2 are there? The molar mass of CO2 is 44.01 g/mol.
Explanation:
Given parameters:
Mass of carbon dioxide = 250g
Molar mass of carbon dioxide = 44.01g/mol
Unknown:
Number of moles of carbon dioxide = ?
Number of molecules of carbon dioxide = ?
Solution:
We first find the number of moles of carbon dioxide;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Number of moles = [tex]\frac{250}{44.01}[/tex] = 5.68moles
From mole concept;
1 mole of a substance contains 6.02 x 10²³ molecules
5.68 mole of carbon dioxide will contain 5.68 x 6.02 x 10²³
= 3.42 x 10²⁴molecules
How do ocean currents affect the air temperature of Buenos Aires and Cape Town? this is for science
Which element below would most likely gain 3 electrons?
Answer:
Lithium
Explanation:
Star A and star B are the same distance away from earth. From earth, star A seems brighter than star B. Which star has the highest absolute brightness?
Answer:
Star B
Explanation:
Star B, this is because, usually in the discussions about stars, the more luminous star or say, the brighter star usually is the one that possesses the smaller absolute brightness.
That being said, succinctly put, if we have two stars A and star B, if star A is brighter than star B, then star A has a lower absolute brightness. Also, if star B is less brighter than star A, then it has the higher absolute brightness.
Answer:
STAR B
Explanation:
Pls help!!! it’s a timed answer
Answer:
Explanation
whats your question
Pls predict and balance the following Chemical equations 30points (5 per question)
Will mark Brainliest
1. Na2(SO4) (aq) + Ba(NO3)2(aq) -->
2. Na(NO3)(aq) + NH4Cl(aq) -->
4. ZnCl2 (aq) + K (SO4) (aq) -->
5. ZnCl2 (aq) + Na2S (aq) -->
6. Na(C2H3O2) (aq) + Ag(NO3) (aq) -->
Answer:
1. Na2SO4 + Ba(NO3)2 → NaNO3 + BaSO4
2. NaNO3 + NH4Cl → NaCl + NH4NO3
4. Sorry, I don't know
5. Refer to the attachment..
6. NaC2H3O2(aq) + AgNO3(aq) = NaNO3(aq) + AgC2H3O2
Hope it can help you and please mark me as a brainlist...[tex] \huge{\blue{Thank \: you}}[/tex]
What isotope of carbon is radioactive:
A) Carbon-12
B) Carbon-13
C) Carbon-14
D) Carbon-13 and Carbon-14
How many grams of water are produced from the decomposition of 63 grams of lithium hydroxide
(LiOH)?
Answer:
18.65004 grams H2O
Explanation:
First, we need to write down the balanced chemical equation for the decomposition reaction:
2LiOH -> H2O + Li2O
Since we have grams of LiOH and we need to know the grams of water, we need to convert to moles since we can only compare moles to moles.
The amu of LiOH is 23.947.
The given grams of LiOH is 63.. To convert to moles, we will divide 63 by 23.947..
This gives us 2.6310 moles LiOH..
To convert to moles of H2O (and later grams of H2O), we will use the mole fractions from the balanced equation...
When we look at the balanced equation we can see that 2 moles of LIOH can produce 1 mol of Water, so:
2.6310 moles [tex]* \frac{1 molH_{2}O}{2 mol LiOH}[/tex] = 1.3155 moles H2O
Now we will convert from moles to grams (we must multiply by the amu)
1.3155 moles H2O = 18.65 grams H2O
According to stoichiometry of the chemical equation of decomposition of lithium hydroxide 23.6 g of water are produced from the decomposition of 63 grams of lithium hydroxide.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical equations.
In the given example, as 47.9 g of lithium hydroxide produces 18 g water ,therefore 63 of lithium hydroxide will produce 63×18/47.9=23.6 g of water.
Thus, 23.6 g of water are produced from the decomposition of 63 grams of lithium hydroxide.
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why water is not used as a thermometric substance
Answer:
Water can be used as the thermometric liquid. It expands and contracts with temperature so it can be used. It's just not a very good choice because: It's thermal expansion is not very large compared to other liquids like mercury.
Explanation:
Hope this help
a sample of carbon dioxide gas at a pressure of 1.10 atm and a temperature of 20.6 occupies a volume of 19.2 L. If the gas is allowed to expand at constant temperature to a volume of 24.3 L, the pressure of the gas sample will be ________ atm
Answer:
0.87atm
Explanation:
Given parameters:
Pressure of the gas = 1.1atm
Initial temperature = 20.6°C = 20.6 + 273 = 293.6K
Initial volume = 19.2L
New volume = 24.3L
Unknown:
New pressure = ?
Solution:
To solve this problem, we apply the Boyle's law equation:
P1V1 = P2V2
P and V are pressure and volume
1 and 2 are the initial and new states
1.1 x 19.2 = P2 x 24.3
P2 = 0.87atm
a compound has hydrogen ion and nitrate ion in solutionstate what is the name of that compound
Answer:
This compound is HNO2
Explanation:
HNO2 ----> H+ + NO2
When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from hydrogen ion and nitrate ion is Hydrogen nitrate.
What is chemical formula?
Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.
Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.
Therefore, the compound that will be formed from hydrogen ion and nitrate ion is Hydrogen nitrate.
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Which statement(s) below are correct regarding Rutherford's gold foil experiment? Choose ALL that apply.
a. The atom is mostly empty space
b. The mass and positive charge is concentrated in the center of the atom
c. Atoms contain a nucleus
d. Most alpha particles bounced off of the gold foil
Answer:
A,B,C
Explanation:
How many grams are in 2.3 moles of O?
Answer:
36.8 g/mol of O
Explanation:
To find the number of grams, multiply the number of moles by the atomic mass of the element.
Oxygen has an atomic mass of 16.00.
2.3 moles O × (16.00 g O ÷ 1 mole) = 36.8 g/mol O
Hope that helps.
List and describe three types of clouds.
Type here:
Plz hurry
Answer:
Cumulus clouds look like fluffy, white cotton balls in the sky. Since they are so thin, they seldom produce much rain or snow.
Cumulonimbus clouds are menacing looking multi-level clouds, extending high into the sky in towers or plumes. More commonly known as thunderclouds, cumulonimbus is the only cloud type that can produce hail, thunder and lightning.
Nacreous clouds are some of the rarest clouds on the planet. They are a form of polar stratospheric cloud, which is a main culprit in chemical destruction of the ozone layer.
Explanation:
How do you calculate the percent composition of an element in a compound
Answer:
Percent composition is calculated from a molecular formula by dividing the mass of a single element in one mole of a compound by the mass of one mole of the entire compound. This value is presented as a percentage.
Explanation:
Which statement best describes the density of an atom's nucleus?
A The nucleus occupies most of the atom's volume but contains little of its mass,
The nucleus occupies very little of the ston's volume and contains little of its mass.
The nucleus occupies most of the stom's volume and contains most of its mass
The nucleus occupies very little of the ston's volume but contains most of its mass
Answer:
D. The nucleus occupies very little of the volume but contains most of its mass
Explanation:
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the nucleus occupies very little of the volume but contains most of its mass. The correct option is option D.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of an atom's nucleus ÷volume marked on the graduated cylinder
Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. The nucleus occupies very little of the volume but contains most of its mass.
Therefore, the nucleus occupies very little of the volume but contains most of its mass. The correct option is option D.
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The symbol for iron is Fe. The chemical symbol for oxygen is O. The formula for iron oxide, a type of rust is Fe2O3. How many iron atoms are in one molecule of iron oxide? A. 1
B. 2
C. 3
D. 4
Use the following equation to answer question 1-4. Make sure you balance first.
6HCI + Fe2O3 --> 2FeCl3 +3H2O
1. How many moles of water are produced from 10.4 moles of hydrochloric acid?
5.2 mol H₂O
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[RxN - Balanced] 6HCl + Fe₂O₃ → 2FeCl₃ + 3H₂O
[Given] 10.4 mol HCl
Step 2: Identify Conversions
[RxN] 6 mol HCl = 3 mol H₂O
Step 3: Stoichiometry
Set up: [tex]\displaystyle 10.4 \ mol \ HCl(\frac{3 \ mol \ H_2O}{6 \ mol \ HCl})[/tex]Multiply/Divide: [tex]\displaystyle 5.2 \ mol \ H_2O[/tex]this is just to make sure but plz help
HEEEEELP PLZ
Which conclusion is most logical, based on the data?
Answer:
its the last one
Answer:
D
Explanation:
Balance the Chemical Equation
Pb(OH)2 + HCl ---> H2O + PbCl2
Please help
Answer:
Pb(OH)2 + 2 HCl ---> 2H2o + PbCl2
Explanation:
4. How many moles in 2.0 x 1023 atoms of H2O?
here.
Answer:
0.33 moles
Explanation:
to find the number of moles,
moles = number of atoms / avogadro's number ie 6.02 x [tex]10^{23}[/tex]
moles = 2.0 x [tex]10^{23}[/tex] / 6.02 x [tex]10^{23}[/tex]
moles = 0.33 mol
For work to be done on an object:
*
The work input must be equal to the work output
The energy input must be equal to the energy output
Only a force must be applied, moving the object is not required
The object has to move a distance when a force is applied to it
Answer:
The object has to move a distance when a force is applied to it
Explanation:
For work to be done on a body the force applied must move the body through a particular distance.
Work done = Force x distance
If no distance is moved by the force, no work is done.
Also, the angle between the force and the distance must be 0 to do the maximum work on the body.
What is natural selection help plz help
Answer:
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
Explanation:
Hope this helps! Please consider marking brainliest! I hope you have an amazing day. Always remember, your smart and you got this! -Alycia :)
Answer:
Natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring.
Explanation:
Which bond is most polar?
ОА СО
ов So
Осно
ODNO
Answer:
either first or second if not them try d but I'm pretty sure a also I'm sorry if I getbyou this wrong I dearly apologize
a sample of methane gas at a pressure of 0.815 atm and a temperature of 265 C occupies a volume of 416 mL. If the gas is heated at constant pressure until its volume is 593 ml the temperature of the gas will be _________ C
Answer:
493.9°C
Explanation:
Given parameters:
Initial pressure =0.815atm
Initial temperature = 265C = 265 + 273 = 538k
Initial volume = 416mL = 0.416L
New volume = 593mL = 0.593L
Unknown:
New temperature =?
Solution:
Since we are dealing with constant pressure condition, we apply charles's law.
It states that the volume of a fixed mass of gas varies directly as its absolute temperature if the pressure is constant.
Mathematically ;
[tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
V1 is the initial volume V2 is the new volume
T1 is the initial temperature T2 is the new temperature
[tex]\frac{0.416}{538}[/tex] = [tex]\frac{0.593}{T2}[/tex]
T2 = 766.9K;
In °C = 766.9 - 273 = 493.9°C
Heat is transferred in all but which way.
Select one:
a. convection
b. sublimation
c. conduction
d. radiation
Btw I know it’s science but chem was closest thing to that
Yo can someone help me answer this
Answer:
D
Explanation:
You need both, independant and dependant variables for a hypothesis.
for an electron to move from an energy level that was close to the nucleus to an energy level that is far from the nucleus would it need to gain or lose energy ?
Answer:
it would need to lose energy
Explanation:
I don't really have an explanation
As the electrons gets closer to the nucleus, by the electrostatic force of attraction electrons are tightly bound to the nucleus. To move the inner electron to outer shell, high energy have to applied to weaken the nuclear force.
What is nuclear force?Nuclear force is the force by which the nucleon are bind in the nucleus and electrons are attracted towards the nucleus. The positively charged protons inside the nucleus electrostatically attracts the negatively charged electrons.
The minimum amount of energy required to remove an electron from the valence shell by overcoming the nuclear force is called ionization energy.
To bring an electron which is closer to the nucleus to the outer shell needs much energy to reduce the nuclear attractive pull. The energy need to gain.
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What is the percent composition of nitrogen in N 2 O
Answer:
63.6%
Explanation:
The given compound is:
N₂O;
The problem here is to find the percent composition of nitrogen in the compound.
First find the molar mass of the compound:
Molar mass of N₂O = 2(14) + 16 = 44g/mol
So;
Percentage composition of Nitrogen = [tex]\frac{2 x 14}{44}[/tex] x 100 = 63.6%
