Answer:
oxygen, silicon, iron, calcium, sodium
Explanation:
these are all found in space rocks known as meteorites. hope this helps :)
Balance the following chemical equations:
N2+02___N2O
Answer:
Balance the following chemical equations:
Explanation:
2N2 + O2 → 2N2O
What energy is required for a reaction to occur?
A. Bond energy
B. Activation energy
C. Kinetic energy
D. Potential energy
Answer:
B. Activation Energy
Explanation: A P E X
Answer: the answer is activation energy
Explanation:
i just took the test
You have a bottle of 18 M H2SO4 in your chemical storage closet. You need to make 2000 mL of a 0.2 M solution. How much of the 18 M sulfuric acid should you need to make this solution (in mL)?
Answer:
20 ml
Explanation:
Luca made the following chart for Earth’s four basic movements. What needs to be correct on his chart? Rotation Speed Revolution Speed Solar System Speed Milky Way Speed 0.3 miles/sec 18.5 miles/sec 370 miles/sec 150 miles/sec The solar system speed and Milky Way speed should be switched. The rotation speed and revolution speed should be switched. The revolution speed and solar system speed should be switched. The rotation speed and Milky Way speed should be switched.
Answer:The Solar System speed and Milky Way speed should be switched
Explanation:
The Milky Way speed and solar system speed should be switched with each other. Therefore, option (A) is correct.
What is the speed of the earth's revolution and rotation?The rotation of the earth can be described as the spinning of the Earth around its own axis. The axis has an angle of 23(1/2)° and it is perpendicular to the plane of the orbit of the earth. The northern and southern hemispheres lean in a direction away from the Sun because Earth is tilted on its axis. The rotation speed of the earth is 0.3 miles/sec.
The Revolution of the earth is the movement of the Earth around the Sun in a fixed path. The revolution speed of the earth is 30 Km/s or 18.5 miles/sec. The milky way speed of the earth is 370 miles/sec and the solar system speed of the earth is 130 miles/sec.
But according to Luca's chart, the milky way speed is 150 miles/sec and the solar system speed is 370 miles/sec.
Therefore, the solar system speed and Milky Way speed need to be switched.
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How many valence electron does sulfur
Explanation:
Sulfur has 6 valence electron
Valence electron shows group( in column)
SOMEONE PLEASE HELP
Answer:
6. 7870 kg/m³ (3 s.f.)
7. 33.4 g (3 s.f.)
8. 12600 kg/m³ (3 s.f.)
Explanation:
6. The SI unit for density is kg/m³. Thus convert the mass to Kg and volume to m³ first.
1 kg= 1000g
1m³= 1 ×10⁶ cm³
Mass of iron bar
= 64.2g
= 64.2 ÷1000 kg
= 0.0642 kg
Volume of iron bar
= 8.16 cm³
= 8.16 ÷ 10⁶
[tex] = 8.16 \times 10^{ - 6} \: kg[/tex]
[tex]\boxed{density = \frac{mass}{volume} }[/tex]
Density of iron bar
[tex] = \frac{0.0642}{8.16 \times 10^{ - 6} } [/tex]
= 7870 kg/m³ (3 s.f.)
7.
[tex]\boxed{mass = density \: \times volume}[/tex]
Mass
= 1.16 ×28.8
= 33.408 g
= 33.4 g (3 s.f.)
8. Volume of brick
= 12 cm³
[tex] = 12 \times 10^{ - 6} \: m^{3} \\ = 1.2 \times 10^{ - 5} \: m ^{3} [/tex]
Mass of brick
= 151 g
= 151 ÷ 1000 kg
= 0.151 kg
Density of brick
= mass ÷ volume
[tex] = \frac{0.151} {1.25 \times 10^{ - 5} } \\ = 12600 \: kg/ {m}^{3} [/tex]
(3 s.f.)
The equation 2NaNO3 + CaCl2 - 2NaCl + Ca(NO3)2 is balanced. How many atoms of sodium (Na) are there on either side of the equation? one two four six
Question: How many atoms of sodium (Na) are there on either side of the equation?
Options: A) one B) two C) four D) six
Correct answer: D) six
Answer:
It is NOT six, i took the test and got it wrong. The CORRECT answer is 2
Explanation:
Using a density of 1.0 g/mL for the water added and adding in the mass of the lithium nitrate, what is the total mass of the solution?
Answer:
The total mass of the solution = 99.7 g
Note: The question is incomplete. The complete question is given below:
A "coffee-cup" calorimetry experiment is run for the dissolution of 2.5 g of lithium nitrate placed into 97.2 mL of water. The temperature of the solution is initially at 23.5oC. After the reaction takes place, the temperature of the solution is 28.3 oC.
1. Using a density of 1.0 g/mL for the water added and adding in the mass of the lithium nitrate, what is the total mass of the solution and solid?
Explanation:
mass = density * volume
density of water = 1.0 g/mL; volume of water = 97.2 mL
mass of water = 1.0 g/L * 97.2 mL
mass of water = 97.2 g
mass of lithium nitrate = 2.5 g
A solution is made by dissolving a solute (usually solid) in a solvent (usually a liquid). The solute in this reaction is lithium nitrate and the solvent is water.
Total mass of solution = mass of water + mass of lithium nitrate
Total mass of solution = 97.2 g + 2.5 g = 99.7 g
Therefore, total mass of the solution = 99.7 g
The total mass of the solution of lithium nitrate solution has been 99.7 grams.
Density can be defined as the mass of the solute per unit volume. The density can be expressed as g/ml or kg/L.
The mass of given Lithium nitrate = 2.5 grams.
The mass of water can be given as:
Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]
Volume of water = 97.2 ml.
The total mass of solution:
Mass of water = Density [tex]\times[/tex] Volume
Mass of water = 1 [tex]\times[/tex] 97.2 grams
Mass of water = 97.2 grams
The total mass = Mass of lithium nitrate + mass of water
= 2.5 + 97.2 grams
= 99.7 grams.
The total mass of the solution of lithium nitrate solution has been 99.7 grams.
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A gas in a sealed container has an initial pressure of 125 kPa at 25.0∘C. If the pressure is increased to 150.0 kPa, what will the new temperature be?
Answer:
[tex]T'=30^{\circ} C[/tex]
Explanation:
Initial pressure, P = 125 kPa
Initial temperature, T = 25.0°C
If new pressure is increased to P' = 150.0 kPa
We need to find new temperature. According to Gay-Lussac's law,
P ∝ T
or
[tex]\dfrac{P}{T}=\dfrac{P'}{T'}\\\\T'=\dfrac{P'T}{P}\\\\T'=\dfrac{150\times 25}{125}\\\\=30^{\circ} C[/tex]
So, the new temperature will be [tex]30^{\circ} C[/tex].
the life of plutonium-239 is 24,300 years. if a nuclear bomb released 8kg of this isotope, how many years would pass before the amount is reduced to 1 kg.
Answer:
97200yrs,
Explanation:
Given parameters:
Half-life of Plutonium - 239 = 24300yrs
Mass of the isotope = 8kg
Unknown:
Number of years it will take for the amount to reduce to 1kg = ?
Solution:
The half -life of any substance is the time taken for half of the compound to decay to half its original composition.
Start first half life second half life third half life
mass 8kg 4kg 2kg 1kg
Time 0yrs 24300 48600 97200
By 97200yrs, the mass would have been 1kg
A chemistry student conducted several different procedures. Which of the following procedures best demonstrates the law of conservation of mass?
O using filter paper to separate 2 grams of solid powder from 10 grams of water
O burning 2 kilograms of wood from a pine tree leaves 0.4 kilogram of ash and soot
O evaporating sugar water leaves 5 grams of sugar and turns the water into water vapor
O combining 2 grams of copper and 4 grams of sulfur to make 6 grams of copper sulfate
Answer:
combining 2 grams of copper and 4 grams of sulfur to make 6 grams of copper sulfate
Explanation:
The Law of Conservation of Mass states that matter cannot be created or destroyed in chemical reactions. It posits that the mass of a substance remains unchanged after undergoing a chemical process.
Therefore, according to the question, the procedure that best demonstrates the law of conservation of mass after the chemistry student conducted different procedures is option D.
This is because, the mass of copper and sulfate did not change but merely combined to form a compound.
How does conduction happen?
Answer:
Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules. ... The fire's heat causes molecules in the pan to vibrate faster, making it hotter. These vibrating molecules collide with their neighboring molecules, making them also vibrate faster.
Explanation:
how many moles of ethanol C2H6O, are in a 10.0g sample
Answer: 0.217 mol
Explanation:
To find the amount of moles in a 10 g sample, we need the molar mass of ethanol.
Molar Mass: 46.07 g/mol
Now that we have the molar mass, we can find moles.
[tex]10.0 g*\frac{1mol}{46.07g}=0.217 mol[/tex]
We know that there are 0.217 mol in a 10.0 gram sample.
A mixture of 10.0 g of Ne and 10.0 g Ar have a total pressure of 1.60 atm. What is the partial pressure of Ar
Answer:
0.53 atm
Explanation:
First we have to obtain the number of moles of each gas.
Number of moles of Ne = 10g/20g/mol = 0.5 moles
Number of moles of Ar = 10 g/40 g/mol = 0.25 moles
Total number of moles = 0.5 moles + 0.25 moles = 0.75 moles
Partial pressure of Ar = number of moles of Ar/Total number of moles * total pressure
Partial pressure of Ar = 0.25 moles/ 0.75 moles * 1.60 atm
Partial pressure of Ar = 0.53 atm
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Explanation:
1. What is the flame color of sodium?
yellow-orange
purple
green
blue-green
Orange is the color of Sodium
who established the two important laws of chemical combination combination state them
Answer:
Antoine Lavoisier
1) Law of Conservation of Mass
French chemist, Antoine Lavoisier in 1789, studied this law. This law states that “In all physical and chemical changes, the total mass of the reactants is equal to that of the products” or “Mass can neither be created nor destroyed.”
is the second one or the fourth one?
Answer:
D. Light waves travel fastest through a vaccumm
Explanation:
"In a vacuum , light waves move their fastest: 186,000 miles per second (300,000 kilometers per second). This is also the fastest that anything in the universe moves. But when light waves move through air, water or glass, they slow down."
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Hopefully I could help! Good luck.
How is the kinetic energy of the particles of a substance affected during a phase change?
Kinetic energy increases during exothermic changes and decreases during endothermic changes.
Kinetic energy decreases during exothermic changes and increases during endothermic changes.
Kinetic energy does not change, but the potential energy does.
Kinetic energy changes in the opposite way that the potential energy changes.
Answer:
its c on edge 2021
Explanation:
During phase change, kinetic energy does not change, but the potential energy does. Therefore, the correct option is option C among all the given options.
What is kinetic energy?Kinetic energy is a type of power that a moving object or particle possesses. An item accumulates kinetic energy when work, which involves the transfer of energy, being done on it by exerting a net force. A moving object and particle has kinetic energy, which relies on both its mass and its rate of motion.
This formula only works for particles traveling at low to moderate speeds; for particles traveling at extremely high speeds, it produces results that are too low. The rules of relativity must be applied when an object's speed approaches the speed of light (3 108 meters per second, about 186,000 miles per second). During phase change, kinetic energy does not change, but the potential energy does.
Therefore, the correct option is option C among all the given options.
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Human blood has a molar concentration of solutes of 0.30 M. What is the osmotic pressure of blood at 25°C?
Answer:
π = 7.33atm
Explanation:
Osmotic pressure is defined as the pressure that must be applied to stop the mass transfer when a semipermeable membrane separates it of pure water. The equation is:
π = M×R×T
Where P is osmotic pressure
M is molar mass = 0.30M
R is gas constant = 0.082atmL/molK
And T is absolute temperature = 25°C + 273.15 = 298.15K
π = 0.30M×0.082atmL/molK×298.15K
π = 7.33atmOsmotic pressure of human blood at 25 degree C or at absolute temperature is equal to 7.33 atm.
What is osmotic pressure?
It is defined as the minimum pressure exerted on the solution, which is required to stop the flow of pure solvent from low concentration to high concentration through the semi permeable membrane.
Osmotic pressure can be calculted as :
P = M × R × T
Where, P = Osmotic pressure
M = Molar mass = 0.30 M (given)
R = Universal gas constant = 0.082 atmL/molK
T = Absolute temperature 25 degree C = 25⁰C + 273.15 = 298.15 K
Putting all these values in the given equation, we get:
P = 0.30 × 0.082 × 298.15 = 7.33 atm
Hence, 7.33 atm is the osmotic pressure of blood at 25⁰C .
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Which process is shown in the diagram?
0,
ing
CO, +H,0
Chloroplast
Mitochondrion
Sugar
Heat
o
ATP
Respiration
The cellular respiration process, which generates ATP as the final result, employs oxygen and sugar as reactants. So, the correct option is A.
What is Cellular respiration?Cellular respiration is the process by which organisms combine oxygen with food molecules, channeling the chemical energy from those resources into life-sustaining activities while eliminating carbon dioxide and water as waste.
Both oxygen and glucose are reactants in the mobile respiratory system. ATP is the primary component of mobile respiration; waste products include carbon dioxide and water.
Oxygen might be present or absent while cells are respiring. Nonetheless, the activity is essentially known as "cellular respiration" because the cell seems to "respire" by consuming molecular oxygen (as an acceptor of electron) and exhaling carbon dioxide (as an end product).
Therefore, the correct option is A.
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Your question is incomplete, most probably the complete question is:
The process shown in the diagram produces oxygen and sugar. Which
process uses oxygen and sugar as reactants?
Chloroplast
Mitochondrion
Sugar
CO, +H,0
ATP
Heat
Respiration
A. Cellular respiration
B. Water cycle
c. Transpiration
D. Photosynthesis
which type of energy is stored as sugars in plant leaves?
1. Chemical
2. Elastic
3. Electrical
4. Mechanical
Answer:
chemical energy
Explanation:
Photosynthesis is the process plants and some algae use to convert light energy to chemical energy stored as sugar within chloroplasts -- the energy factories found in plant cells.
Igneous rock that formed when magma hardened beneath Earth's
surface.
Answer:
hahahahahahahahahahaha ur funnny
Explanation:
NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOB
Graphic organizer: Use the terms in the word bank to complete the graphic organizer below
Answer:
1. Chemical reactions
2.Substances
3. Properties
4. Precipitate
5. Light
6. Temperature
7. Color
8. Gas
Explanation:
Chemical reactions are known to produce new substances which have new properties. During the chemical reactions, evidences that are seen are formation of precipitate or light gel, production of gas and change in temperature and color.
Chemical reactions occur when chemical substances come together to react because those substances are compatible with each other.
In what phase is CO2 at 4 atm and -10°C is liquid, gas or solid? Starting from the same point, 4 atm and −10 °C, what phase change would eventually result from an increase in pressure?
a. vaporization
b. sublimation
c. freezing
d. deposition
e. melting
f. condensation
Answer:
(f).Condensation
CO2 exist as gaseous state at -10degree 4atm pressure and will become liquid upon increasing the pressure
Explanation:
Using The phase diagram of CO2 we observe that
Carbon dioxide at -10degree Celsius and 4atm pressure will be in
Gaseous phase. Starting from the same point, 4atm and -10degree Celsius upon increasing the pressure the Carbon dioxide will change into liquid phase above 5.11atm pressure, this happened due to Condensation.
Therefore CO2 exist as gaseous state at -10degree 4atm pressure and will become liquid upon increasing the pressure till 5.11stm.
The carbon dioxide has been existing in the gaseous state and with condensation, it has been converted to the liquid state. Thus, option F is correct.
The state of the gas at a particular pressure and temperature can be assessed from the phase diagram.
The state of Carbon dioxide at 4 atm and [tex]\rm -10^\circ C[/tex] have been the gaseous state.
The increase in pressure results in the decrease in the volume of the gas, as the pressure has been increased, the molecules will condense and result in the conversion of the gaseous state to the liquid state.
The carbon dioxide has been existing in the gaseous state at 4 atm and [tex]\rm -10^\circ C[/tex]. With the increase in pressure, the state of the gas has been changed to liquid due to condensation. Thus option F is correct.
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Nitromethane (CH3NO2) is an explosive compound sometimes used as a fuel booster in racecars. What is the formal charge of the nitrogen in a nitromethane molecule?
a. -2
b. -1
c. 0
d. +1
Answer:
Option d. is correct
Explanation:
Nitromethane is an organic compound that can be used as a fuel booster in rockets. Its chemical formula is [tex]CH_3NO_2[/tex].
This compound is produced as a result of reaction of sodium chloroacetate with sodium nitrite in aqueous solution.
The electron-dot structure of a nitromethane molecule shows [tex]+1[/tex] charge on the nitrogen.
Option d. is correct
Of the molecules below, only ________ is polar.
a. Cl2
b. CS2
c. H2O
d. CBr4
e. PF5
Answer:
The correct answer is option c, that is, H2O.
Explanation:
The two broad classes of molecules are the polar and nonpolar molecules. Polarity illustrates the dispersion of electrical charge surrounding a molecule. The charge is unevenly distributed in a polar molecule, while it is distributed evenly in a nonpolar molecule. It can be said that a polar molecule possesses the regions of partial charge.
A polar molecule like water possesses a dipole, that is, a part of the molecule exhibit a partial negative charge, and the part of the molecule possesses a partial positive charge. Generally, a polar molecule comprises polar or ionic covalent bonds. The polar molecules are generally soluble in polar solvents and are hydrophilic. They have higher melting points because of the strong intermolecular forces between them in the form of hydrogen bonding.
In the given options, H2O is a polar molecule as the hydrogen atoms electrons get fascinated towards the oxygen atom's electrons, which forms a positive charge on the atoms of hydrogen, and a negative charge on the oxygen atom.
Of the molecules, only water (H₂O) is polar and the correct option is option C.
A polar molecule is a molecule that has a partial positive charge (+) and a partial negative charge (-) due to an uneven distribution of electron density. This occurs when there is a significant difference in electronegativity between the atoms within the molecule, causing the electrons to be pulled more towards one atom, creating a polarity.
In a polar molecule, the positive and negative charges are not balanced, resulting in a molecular dipole moment. The molecule may have a distinct positive and negative end, referred to as the poles.
Thus, the ideal selection is option C.
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Which substance would have the highest melting point, based on electronegativity?
H2O
H2S
H2Te
H2Se
Answer:
H₂O
Explanation:
Based electronegativity, water H₂O will have the higher melting point from the given choices. The binding force between hydrogen and oxygen is greater than for the others.
In group 6, oxygen has the highest electronegativity. It pulls the shared electron closer in the bond. The high electronegativity between hydrogen and oxygen causes the elevated melting point between the two species.Answer:
H2O
Explanation:
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How many Stars are In the Milky way Galaxy
Answer:
100 thousand million stars
Explanation:
Answer:
100 to 400 billion stars
Why is it necessary to cool a hot , supersaturated solution slowly during a recrystallization?
Answer:
This is because, the is less chance of trapping impurities in the developing crystal lattice
Answer:
injuries
Explanation:
bc it will burn your hands