Answers
Answer:
the law of conservation of mass is valid for all the following, except nuclear reactions.
Explanation:
the law of conservation of mass is valid for all the following, except nuclear reactions because some mass gets converted to energy.
Answer:
Nuclear reactions
Explanation:
What's this law?
This law states that in any chemical reaction the mass is neither created nor destroyed ,it remains conservedRelated Questions
How many solutions does the equation (―3)(+ 1)(+ 5) = 0 have? What are the solutions?
Answers
Answer:
- 15 = 0
Explanation:
==> (―3)(+ 1)(+ 5) = 0
==> -3 × +1 × +5 = 0
==> -3×+5=0
==> -15=0
a reaction requires 2.5 moles of zinc oxide. how many grams would this equate to?
Answers
Answer: 45.038
Explanation: 2.016 H (2*1.008) + 15.999 O (1*15.999)
One mole of Zn weighs about 65.4 grams. Therefore, the mass equivalent to 2.5 moles is number of moles times the atomic mass that is 163.5 here.
What is one mole ?Any substance containing 6.022 × 10²³ atoms is called one mole of that substance. This number is called Avogadro number. Thus one mole of any element contains Avogadro number of atoms.
The mass of one mole of the element is called its atomic mass. Similarly the mass of one mole of a compound is called its molar mass. Zinc is a transition metal.
Atomic mass of Zn = 65.1 g
thus, mass of 2.5 mole of Zn = 65.1 × 2.5 = 163.5 g.
Therefore, the mass of 2.5 moles of Zn is 163.5 g
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The sound of a plucked guitar string travels through the air and strikes the eardrum of a person in the same room. How does the sound wave change when it transfers from the air to the person’s eardrum?
Both the speed and the wavelength of the sound change.
Neither the speed nor the wavelength of the sound change.
Both the frequency and the wavelength of the sound change.
Neither the frequency nor the wavelength of the sound change
Answers
When sound wave travels from air to a person's eardrum, both the speed and the wavelength of the sound change.
Refractive index of soundThe refractive index of sound is obtained from the ratio of speed of sound in air to speed of sound in material.
refractive index = speed of sound in vacuum / speed of sound in material
refractive index = wavelength of sound in material / wavelength of sound in vacuum
Note: the frequency sound will remain constant.
Thus, when sound wave travels from air to a person's eardrum, both the speed and the wavelength of the sound change.
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If a cat climbs a tree , what chemical process is taking place to provide the power for this movement?
Answers
Answer:
Respiration
Explanation:
Mitochondria convert glucose and oxygen to carbon dioxide, water. This reaction (respiration) releases energy whigh can be used to climb a tree and much more.
please help quickly the answer on the pic I attached
Answers
Answer:
letter C is a structure most like that of slate
The pOH of a solution is 3.45. What is the OH⁻ concentration in the solution?
Answers
The concentration of the hydroxide ion [OH¯] in the solution having a pOH of 3.45 is 3.55×10¯⁴ M
What is pOH?The pOH of a solution simply defines the concentration of the hydroxide ion [OH¯] in the solution. It can be expressed mathematically as
pOH = –Log [OH¯]
How to determine the value of [OH¯]From the question given above, the following data were obtained:
pOH = 3.45concentration of hydroxide ion [OH¯] =?pOH = –Log [OH¯]
3.45 = –Log [OH¯]
Multiply through by –1
–3.45 = Log [OH¯]
Take the anti-log of –3.45
[OH¯] = anti-log of (–3.45)
[OH¯] = 3.55×10¯⁴ M
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Two elements are found together in a substance. They are not chemically combined. Is this substance an element, a mixture or a compound?
Answers
substance
A chemist wants to observe the following reaction
2H2+O2->2H2O
The chemist is standing inside a room with oxygen in the air and has a balloon filled with hydrogen. The chemist holds a small flame up to the hydrogen balloon when the balloon pops the hydrogen explodes in a ball of fire.
based on what you know about breaking and forming bonds, explain which part of the reaction is higher and energy. defend your answer in 3 to 5 sentences
Answers
The part of the process that requires greater energy is the breaking of bonds between oxygen and hydrogen atoms
What is a chemical reaction?A chemical reaction is said to occur when the chemical bonds in substances break and new bonds are formed. Hence, a chemical reaction involves the breaking and forming of bonds.
We can see that the part of the process that requires greater energy is the breaking of bonds between oxygen and hydrogen atoms because energy in the form of heat had to be supplied for that to happen.
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Answer:
This reaction is a chemical reaction because it involves the forming and breaking of bonds. The part of the reaction that is higher in energy is breaking the bond between oxygen and hydrogen atoms. This is because energy is supplied being in the form of heat which requires more energy.
Explanation:
I need to add 8 moles of carbon to the reaction. How many grams of carbon should i weigh?.
Answers
Answer:
96g
Explanation:
so, molar mass of C =12g/mol
C=8 moles
8x12
= 96
Describe
the kinetic-potential energy
conversions that occur when
a basketball bounces
Answers
At the moment the ball hits the ground, its kinetic energy is greatest and its potential energy is zero.
One gram of sugar provides 4. 0 calories. How many calories you will get by drinking
one can (330 ml) of cola?
Answers
1320 calories will be got by drinking one can (330 ml) of cola.
HOW TO CALCULATE CALORIES?Calories refers to the unit of measurement of energy consumed in food.
According to this question, one gram of sugar provides 4.0 calories of energy.
1g of a liquid substance equals 1mL. Therefore, 330mL of cola will equal (330 × 4) = 1320 calories of energy.
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Hard water has high concentrations of: a. sodium and chloride b. calcium and fluoride c. magnesium and sodium d. sulfur and potassium e. calcium and magnesium
Answers
Hard water is water that contains calcium ions or magnesium ions.
What is hard water?The term hard water is water that contains calcium ions or magnesium ions. These ions are able to interact with soap and prevent the formation of lather thereby making it difficult for this water to be used in washing.
However, hard water is good for building strong bones as well as for building the calcareous shell of organisms.
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An enclosed 20 ml metal cylinder was filled with a gas sample at room temperature. The sample then was transferred to an empty 40 ml enclosed container, also at room temperature. After being transferred, the volume of the gas was:.
Answers
Answer:
-34.90
Explanation:
by enclosed to 20 ml metal cylinder was filled with glass increased by 40 and divided to 2 equal 30 then add the theoragly formula .90
What is the pressure in atm of 0.47mol of a gas in a 1.7L container at 276K?
Answers
2. A sample of gas is placed in a container at 25oC and 2 atm of pressure. If the temperature is raised to 50oC, what is the new pressure? P = 2.17 atm
3. At 1 atm of pressure water boils at 100oC, if the sample was placed under 2 atm of pressure, what would be the temperature? (This would be like a pressure cooker).
T = 746 K = 473oC = 883oF
4. At what temperature would water boil if the pressure is 600 torr? (Use information from problem 3: this shows why food doesn't cook well at higher elevations)
T = 294 K = 21.5oC = 70.7oF
5. Calculate the volume of 40.6 g of F2 at STP. V = 23.9 L
6. A sample of 2.0 moles of hydrogen gas is placed in a container with a volume of 10.4 L. What is the pressure of the gas in torr if the gas is at 25oC? P = 4.70 atm = 3576
7. The tire pressure is 32 psi. What is the pressure in torr if 1 atm = 14.7 psi?
P = 1654 torr
8. A gas is placed in a balloon with a volume of 3.0 L at 28oC and 900 torr. What would be the new volume for the gas if placed under STP? V = 3.2 L
9. How many moles of gas would occupy a volume of 14 L at a pressure of 700 torr and a temperature of 30oC? n = 0.52 mol
10. Calculate the volume of 24.0 g of HCl at STP. V = 14.8 L
11. What is the volume of one mole of acetylene gas at STP? V =22.414 L
12. What is the volume of 0.75 mol of gas at 72oC and 2 atm? V = 10.6 L
13. After eating beans, a student collects a sample of gas at 0.97 atm and 26oC which occupies a volume of 3.5 L, calculate its volume at STP. V = 3.1 L
14. Ammonia (NH3) is placed in 1.5 L flask at 25oC. If the pressure of the gas is 0.899 atm, what is the density? d = 0.626 g/L
15. A mixture of Ar and CO gases is collected over water at 28oC and an atmospheric pressure of 1.05 atm. If the partial pressure of Ar is 600 torr, what is the partial pressure of CO? (vapor pressure of water at 28oC is 28.3 mmHg) PCO = 0.223 atm
16. Determine the partial pressures of each of the gases in the following mixture: 17.04 g NH3, 40.36 g Ne and 19.00 g F2. The gases are at 1.5 atm of pressure.
PNH3 = 0.428 atm; PNe = 0.857 atm; PF2 = 0.2124 atm
17. Potassium chlorate decomposes under heat as follows:
2 KClO3 (s) -------> 2 KCl (s) + 3 O2 (g)
The oxygen gas is collected over water at 25oC. The volume of gas is 560 mL measured at 1 atm. Calculate the number of grams of KClO3 used in the reaction. (vapor pressure of water = 0.0313 atm) nO2 = 0.022 mol; 1.81 g KClO3
Devise a 6‑step synthesis of the starting material from the product. The cyclopentene is a key intermediate.
Answers
Cyclopentene is industrially produced in large quantities. It is used as a monomer for the synthesis of plastics, in addition to other chemical syntheses.
The 6‑step synthesis of the starting material from the productReaction 1 - Preparation of keto-aldehyde
Reaction 2 - Preparation of cyclopentene carbaldehyde
Reaction 3 -Preparation of α,β-epoxy-carbaldehyde cyclopentane
Reaction 4 - Preparation of cyclopentene alcohol
Reaction 5 -Preparation of α,β-epoxy-cyclopentane alcohol
Reaction 6 -Preparation of α,β-epoxy-carbaldehyde cyclopentane
With this information we can conclude that cyclopentene is used as a monomer for the synthesis of plastics.
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Is it possible that the room gets warmer due to our body heat?.
Answers
Answer:
no because humans turn their extra body heat into sweat instead of dissipate heat through evaporation in the air.
Explanation:
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How are salt-water ecosystems and freshwater habitats different from one another?
Salt-water ecosystems are home to migrant animals but animals in freshwater habitats live there all year.
Some land mammals live in freshwater habitats but not in salt-water ecosystems.
Freshwater habitats are more diverse than salt-water ecosystems.
Some land mammals live in salt-water ecosystems but not in freshwater habitats.
Answers
Given what we know, we can confirm that the option that most explains the difference between Salt water ecosystems and fresh water habitats is option C.
How are these ecosystems different?We can say that Fresh water habitats are more diverse than Salt water ecosystems. This is the correct option amongst the ones listed. The options regarding land mammals are incorrect given that land mammals may use Salt water ecosystems, but do not reside in them. Finally, option A is incorrect given that both fresh and Salt water animals are often migratory.
Therefore, we can confirm that for these reasons, the correct choice is option C.
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Answer:
Some land mammals live in freshwater habitats but not in salt-water ecosystems.
Explanation:
i did the quiz
According to the information provided, which of the following
correctly lists the total number of neutrons and protons
emitted during alpha decay?
A. 4
B. 2
C. 1
D. 0
Answers
A weather balloon holds 2,600 cubic meters of helium. The density of helium is 0. 1755 kilograms per cubic meter. How many kilograms of helium does the balloon contain? Please round your answer to the nearest whole number. Only enter a numerical value in the answer blank.
Answers
Answer:
for those whos question asked them to round to the nearest whole number the answer is 456
Explanation:
The weather balloon contains 456.3 kilograms of helium.
How are the density, volume and mass of a substance related?Suppose that a finite amount of substance is there having its properties as:
mass of substance = m kg
density of substance = d kg/m³
volume of that substance = v m³
Then, they are related as:
[tex]Density = \frac{mass}{volume}[/tex]
For the given case, we are given that:
Volume of balloon = volume of helium it contains = 2600 m³ = m
Density of helium it contains = 0.1755 kg/m³ = d
Let its mass be m, then:
Density of helium it contains = 2600 × 0.1755
= 456.3.
Hence, the weather balloon contains 456.3 kilograms of helium.
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Convert from 150 cal(or kcal) to joules. Remember that 1 cal = 4.184 J.
Answers
Answer:
627.6
Explanation:
150 x 4.184 = 627.6
Remember:
calories multiplied by 4.184
Which word equation shows hydrogen reacting with oxygen to form water?
CORO
oxygen + water hydrogen
hydrogen + oxygen - Water
oxygen + water hydrogen + water
hydrogen + water - Oxygen
Mark this and retum
Save and Exit
Next
Submit
Answers
Answer:
O2+H2 → H2O
become→zero to−2
∵ it will be reduced and oxidation state of H
2
becomes zero to +1 it will be oxidised.
∴ reaction will be redox
Explanation:
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what happens when glycerol is added to water?
a. water evaporates more easily
b. water viscosity decreases
c. boiling point of the mixture exceed 100°C
d. freezing point of the mixture drops below 0°C
Answers
Answer:
The answer is going to be D
8) Hospitals buy 400 L cylinders of oxygen gas compressed at 150 atm pressure. They need to
administer oxygen to patients at 3.0 atm. What volume (V2) of oxygen can a cylinder supply at this lower
pressure?
Answers
Answer:
the answer will be 20,000 L
The volume of one mole of carbon dioxide gas at (STP) is__L
Answers
Explanation:
[tex]22.4 lit[/tex]
Which statements are true based on specific heat? Check all that apply. Land heats up/cools down faster than water. Regions with moderate climates often have large bodies of water surrounding them. Water boils quicker than alcohol or ether.
Answers
Specific heat is the quantity of heat required to raise the one gram of substance by one degree Celsius. Both A and B is correct.
What is specific heat ?Specific heat is the quantity of heat required to increased the temperature of one gram of a substance by one Celsius degree.
The units of specific heat are usually measure in calories or joules per gram per Celsius degree. For example, the specific heat of water is 1 calorie (or 4.186 joules) per gram per Celsius degree.
The specific heat is the amount of heat required to raise a gram of water by one degree Celsius. When heat is absorbed by H₂O, the hydrogen bonds starts to break and the water molecules are move. This means that water can absorb heat before change in temperature.
Thus, both A and B are correct.
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given the fact that nitrogen is abundant in the atmosphere why is it included in fertilizers
Answers
Answer:
Explanation:
Nitrogen fertilizers are added to soil because nitrogen is very important for plant growth and most organisms can not utilize atmospheric nitrogen. Even though the percentage of nitrogen in the atmosphere is very high, yet it is not available to most living organisms for use because the energy required to break the bonds that hold the diatomic nitrogen together is very high
Why does an electrolyte conduct electricity? (IF ANSWER IS GOOD AND CORRECT I WILL GIVE BRAINLIEST)
Answers
Answer:
because there's a chemical reaction that happens between the anions and cations. The cations are positive ions and anion are negative ions. the reaction occurs as one loses electrons and the other one gaining.
Is thermal energy being transferred from the metal pan to the eggs by radiation in this image? Why or why not?
Answers
No, thermal energy is not being transferred from the metal pan to the eggs by radiation in this image.
What is radiation?Radiation can be described as energy or particles from a source that travels through space or other mediums. Light, heat, microwaves and wireless communications are all forms of radiation.
It is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field associated with it, and has wave-like properties. You could also call radiation “electromagnetic waves”.
In the image, since eggs are in direct contact with the pan therefore it is conduction and not radiation.
Therefore, No, thermal energy is not being transferred from the metal pan to the eggs by radiation in this image.
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Name each of the stages in the life cycle of our sun. Describe what each stage is like, or what happens to cause it to change from one stage to the next
Answers
Explanation:
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what describes the process by which gas goes directly to a solid phase
A sublimation
b solidification
c vaporization
d deposition
Answers
Deposition is when a gas transitions directly to the solid phase without passing through the liquid phase D) Deposition.
During deposition, the gas molecules lose energy and come together to form a solid substance. This process is the reverse of sublimation, where a solid directly transitions to the gas phase without becoming a liquid.
Deposition refers to the process in which a substance changes directly from a gaseous state to a solid state without passing through the intermediate liquid phase. It is the reverse process of sublimation, where a solid transforms instantly into a gas.
During deposition, the gas molecules lose energy and come together to form a solid structure. This can occur when the temperature and pressure conditions favor the gas to bypass the liquid phase and directly convert it into a solid.
Examples of deposition can be seen in various natural phenomena, such as frost forming on a cold surface or the formation of snowflakes from water vapor in the atmosphere. In these cases, the water vapor bypasses the liquid phase and directly transforms into solid ice crystals through deposition. Therefore, the correct answer is D) Deposition.
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