Answer:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings. The frezing of water is an exothermic process because heat is being removed from the system. In gases the particles move rapidly in all directions, frequently colliding with each other and the side of the container. With an increase in temperature, the particles gain kinetic energy and move faster. Hope this helped! :)
Which substance gives heat and light after combustion?
Answer:
Magnesium oxide
Explanation:
The substance which undergoes combustion is said to be combustible.It is called fuel. If a magnesium ribbon is heated,it starts burning. When a magnesium ribbon burns,it combines with the oxygen of air to form magnesium oxide,and liberates heat and light.
The tallest building in the world, the burj khalifa in Dubai, is 0.828 kilometers high. What is the building height in centimeters
I need help on this question
Answer:
The way its parts are arranged
Explanation:
HelpPPPP PLEASEES I need in 3 minutes
How many atoms does the formula 2HgO have?
Answer:
4
Explanation:
2HgO
2 * 1 Hg atom = 2 Hg atoms
2 * 1 O atom = 2 O atoms
2+2 = 4 atoms total
1. Box A and box B have the same density.
Box A has more volume. Which box has
more mass?
a) Box A
b) Box B
Answer:
b
Explanation:
a gas occupies 3.5 L at standard pressure. find the volume of the gas when the pressure is 1.5 atm
Answer:
5.25 lit
Explanation:
[tex]standard \: pressure = 1atm[/tex]
[tex] \frac{3.5lit}{1atm} = \frac{x}{1.5atm} [/tex]
[tex]x = 5.25lit[/tex]
I WILL MARK BRAINLYEST!
What are two things that the DDT and ozone story have in common?
there's no answer options I just need sentences please!
Answer:
DDT (dichloro-diphenyl-trichloroethane) was developed as the first of the modern synthetic insecticides in the 1940s. It was initially used with great effect to combat malaria, typhus, and the other insect-borne human diseases among both military and civilian populations.
Ozone is a naturally occurring molecule. An ozone molecule is made up of three oxygen atoms. It has the chemical formula O3.
Explanation:
It is commonly used as a fire extinguishing agent. The reason it has so much ozone depleting potential is because it contains bromine, which has many times the ozone depleting potential of chlorine.
What is the purpose of the flame that is lit below a hot air balloon?
A. To decrease enthalpy
B. To decrease specific impulse
C. To increase enthalpy
D. To increase reduction
Answer:
A. To increase enthalpy
Explanation:
Because the burner is the engine of the hot air balloon it is what propels the hot air up into the envelope to make the balloon rise
As you move across the periodic table, from left to right, atoms tend to get smaller
because,
(0.5 Points)
they have more mass
they have less mass
they have more protons.
they have less electrons.
Explanation:
because they have more protons
An allele that is not dominant is know as what
Answer:
Recessive
Explanation:
Hope this help I think this is the right answer.
HELP
which listed elements would form metallic bonds? Check all that apply
- Bi
- Xe
- I
- Ag
- Li
Answer:
Bi (Bismuth)
Ag (Silver)
Li (Lithium)
Explanation:
Xe (Xenon) and I (Iodine) are non-metals. They cannot from a metallic bond because metallic bonds are bonds between metals only.
Given 3.50 mol of CH4, how many grams of Oz are required to completely react with all the CH4 CHP CH. + 20% CO2 - 2H2O 1
Answer:
2.7
Explanation:
How is the kinetic energy of the particles that make up a substance different
after it changes state?
A. The kinetic energy is less after a substance changes from a liquid
to a gas.
OB. The kinetic energy is less after a substance changes from a gas to
a plasma
C. The kinetic energy is greater after a substance changes from a
liquid to a solid
D. The kinetic energy is greater after a substance changes from a
solid to a liquid.
Answer:
D. The kinetic energy is greater after a substance changes from a
solid to a liquid
Explanation:
During a phase change from solid to liquid, the particles making up the mobile becomes more mobile and as a result there is an increase in kinetic energy of the system.
Kinetic energy is the energy accrued due to the motion of a body. In a melting process where solids turn to liquid, there is an increase in kinetic energy. When randomness of a system increase, kinetic energy also increases. From liquid to gas and gas to plasma increases kinetic energy. In the other way round, the kinetic energy reduces.Answer:
D. The kinetic energy is greater after a substance changes from a solid to a liquid
Explanation:
Which kind of wave is created by moving a spring toy up and down?
electromagnetic
longitudinal
transverse
surface
Answer:
Transverse!
Explanation:
Transverse is a more direct moving wave
The wave which is generated by moving a spring toy up and down is transverse wave. An electromagnetic wave is a transverse wave. The correct option is C.
What is transverse wave?A transverse wave is a progressive wave. The direction of propagation of a transverse wave is always perpendicular to its direction of vibration. They are non-mechanical waves which do not need a medium for propagation and they consists of crests and troughs.
When a toy spring is moved up and down, the generating waves that propagate in the horizontal direction while disturbing the toy spring in the vertical direction. In physics transverse wave is considered as a moving wave where oscillations are perpendicular to the direction of the wave.
The transverse waves are found commonly in elastic solids, oscillations, etc. The waves generated by moving a spring toy up and down is transverse wave.
Thus the correct option is C.
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A particle that gains electron is called a cation
true or false
TRUE. BECAUSE : When an atom gains electrons (which are negatively charge), the ion formed is negatively charged and is called an anion. If an atom loses electrons, the ion formed in positively charged and is called a cation.
Scientific theories are usually
A.
unable to change as new data or technology emerges.
B.
supported by evidence and widely accepted by the community.
C.
based on opinions and feelings.
D.
claims posed by individuals.
Answer:
B
Explanation:
Cuz they are supported once discovered and then widely spread then accepted
Answer:
B.
Explanation:
A scientific theory is a broad explanation that is widely accepted because it is supported by a great deal of evidence. Because it is so well supported, a scientific theory has a very good chance of being a correct explanation for events in nature. Because it is a broad explanation, it can explain many observations and pieces of evidence. In other words, it can help connect and make sense of many phenomena in the natural world.
Does the size of the rock affect how fast a rock can be weathered?
Answer:
Most chemical weathering takes place only on the outer surface of a rock. Therefore, rocks with a lot of surface area weather faster than rocks with little surface area. However, if a rock has a large volume as well as a large surface area, it takes longer for the rock to wear down.
Explanation:
In a school’s laboratory, students require 50.0 ml of 2.50 m h2so4 for an experiment, but the only available stock solution of the acid has a concentration of 18.0 m. what volume of the stock solution would they use to make the required solution? use m subscript i v subscript i equals m subscript f v subscript f.. 0.900 ml 1.11 ml 6.94 ml 7.20 ml
The volume of stock solution they use to make the required solution is 6.94mL.
How we calculate the volume?To calculate the value of required volume we will use the below equation:
M₁V₁ = M₂V₂, where
M₁ = molarity of stock solution = 18M
V₁ = volume of stock solution = to find?
M₂ = molarity of H₂SO₄ solution = 2.50M
V₂ = volume of H₂SO₄ solution = 50mL
On putting all these values on the above equation and calculate for the value of V₁ as:
V₁ = (2.50)(50) / (18)
V₁ = 6.94mL
Hence correct option is (3) i.e. 6.94mL.
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Answer:
C. 6.94 mL
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
4. Which type of fault does NOT cause
earthquakes?
A normal
B parallel
C reverse
D strike-slip
Answer:
Earthquakes occur on faults - strike-slip earthquakes occur on strike-slip faults, normal earthquakes occur on normal faults, and thrust earthquakes occur on thrust or reverse faults. I hope this helps you :)
The mobile electrons of a pure metal are
called what
Answer:
This means that the metal is more properly viewed as an array of positive ions surrounded by a “sea of mobile valence electrons.” Electrons which are capable of moving freely throughout the empty orbitals of the metallic crystal are called delocalized electrons (Figure below).
60 points! please help me i will appreciate it!
answer correct
urgent
Answer:
i don't understand let us know which one you want us to answer
Dalton's Atomic Theory explains many well-established scientific laws including all of these except the
A. Law of Conservation of Mass.
B. Law of Definite Composition.
C. Law of Multiple Proportions.
D. Periodic Law.
Dalton's Atomic Theory explains many well-established scientific laws, including all of these except the law of Conservation of Mass. The correct option is A.
What is Dalton's Atomic Theory?According to the second component of the theory, the mass, and characteristics of every atom in a specific element are the same. Compounds, according to the third section, are combinations of two or more different kinds of atoms.
Dalton's theory thus recognized that all matter is made up of atoms, which is accurate, but it did not recognize the presence of smaller particles within atoms, which is wrong.
Dalton's theory, which claimed that atoms could not interact with one another, is erroneous because compounds are created by the fusion of two or more different kinds of atoms.
Therefore, the correct option is A. Law of Conservation of Mass.
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can someone help with homework anyone? right now its science...
Answer:
Organ
Explanation:
Cells work together to make tissues, tissues work together to make organs, organs works together to make the organ system, and the organ system works to help the organism stay alive and do all of the physical stuff._.
What is the muddy water if the mud in muddy water eventually settles out?.
it will become a solution.hope this helps!
suggest why the copper sulfate solution was left for four minutes before adding the magnesium
please help
Copper is unable to displace magnessium in a reaction so the copper sulfate solution was left for four minutes before adding the magnesium.
The electrochemical seriesThe electrochemical series shows the order of reactivity of the metals. The metals that are higher in the series can displace the metals that are lower in the series in a chemical reaction.
We know that copper is unable to displace magnessium in a reaction hence the reaction can not occur in the reverse direction. Hence, the copper sulfate solution was left for four minutes before adding the magnesium.
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How does benzene react with concentrated sulfuric acid?
Benzene reacts with concentrated sulfuric acid to form benzene sulfonic acid .
The reaction attached
Answer:
See below ~
Explanation:
Which are indicators that a chemical change has occurred? Check all that apply. change in odor change in shape change in energy change in color change in size o formation of a precipitate
Color change, formation of a precipitate, formation of a gas, odor change, temperature change is the correct answer
What is Chemical Indicator ?
Chemical indicators are substances that change color in response to changes in a chemical environment, such as changes in pH, temperature, or the presence of certain ions. They are commonly used in a variety of applications, such as quality control in manufacturing, medical diagnostics, and laboratory research. There are many different types of chemical indicators, including pH indicators, which change color in response to changes in the acidity or alkalinity of a solution, and redox indicators, which change color in response to changes in the oxidation state of a substance.
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Answer:
they're all right
Explanation:
on edge
6. The following reaction occurs under standard conditions:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
a. Which bonds are broken and which are formed during the reaction? (1 point)
b. Determine the enthalpy of the reaction. (2 points)
Answer:
a. CH4 → CO2 and H20
O2 → CO2 and H20
b. -890 kJ
Explanation: