Answer: Atoms lose energy as a gas changes to a solid.
Explanation:
Answer:
Atoms lose energy as a gas changes to a solid.
Explanation:
Help!
The standard unit of mass is __________.
a. gram
b. pound
c. kilogram
Answer:
kilogram ;)) The kilogram is the standard
When a nucleus breaks up to gain a more stable ratio of protons and neutrons
a
radiation poisoning
b
radioactive tracing
c
radioactive dating
d
radioactive decay
Please helpppp ASAP !!!!Which phase changes require the addition of energy to happen, which phase changes require the removal of energy ?
Answer:
Evaporation
Explanation:
Evaporation involves a liquid becoming a gas and sublimation is the change of a solid directly to a gas. Phase changes require either the addition of heat energy or subtraction of heat energy .
Which paragraph from the article explains why the ultracool dwarf star discovery is so
significant to the search for other signs of life?
The system's host star, called TRAPPIST-1, is what is known as an ultracool dwarf. It is about
one-tenth the size of our sun and just a bit bigger than Jupiter.
Going forward, the authors plan to use even more powerful telescopes to analyze the
TRAPPIST-1 system. The Hubble Space Telescope will point its powerful lens toward the
ultracool dwarf star.
O "Systems around these tiny stars are the only places where we can detect life on an Earth-
sized exoplanet with our current technology," Gillon said in a statement. "If we want to find
life elsewhere in the Universe, this is where we should look."
O Ultracool dwarfs make up about 15 percent of the astronomical objects in our immediate
neighborhood, but until now, no one had ever discovered a planet orbiting one.
Answer:
It is ultracool dwarfs make up about 15% of the astronomical objects.................blah blah blah
Explanation:
took test
Select the correct answer.
Which statement is true?
Answer:
which statement is true what is the question
what is the name for a substance that cannot be separated into simpler substances ?
a. element
b. compound
c. alloy
d. mixture
Answer:a element
Explanation:
1. What is the definition of the word "petition"?
2. What was the name of the petition the delegates sent to King George 111?
Answer:
Definition: a formal written request, typically one signed by many people, appealing to authority with respect to a particular cause.
name was: Olive Branch petition. Why? = The Olive Branch petition was signed on July 8, 1775, and dispatched to Great Britain on two ships. King George III refused to even accept or consider the Olive Branch petition sent by the Continental Congress.
Explanation:
The students are studying the process of how controlled gasoline explosions that take place in a cars engine change the potential chemical energy into the kinetic mechanical energy that moves the car.
which statement is true about this reaction?
A..This is an exothermic reaction because energy is absorbed.
B.this an endothermic reaction because energy is absorbed.
C.this is an exothermic reaction because energy is released
D.this is an endothermic reaction because energy is released
Answer:
C.this is an exothermic reaction because energy is released
Explanation:
The explosion of gasoline in a car engine is an exothermic reaction.
An exothermic reaction is one in which heat is given out to the environment. That means, heat is released during the reaction.
When gasoline undergoes controlled explosion in car engines, heat is released, hence the answer.
Is a microwave oven ac or dc
Answer:
Microwave Ovens run on AC Input from the power supply.
Answer:
Its an AC
Explanation:
microwave ovens run on AC Input from the power supply.
Which phrase best defines a prototype? The final product, which has undergone extensive testing and redesign a model that has been redesigned and retested several times the criteria established to help solve a problem a model from which later versions are developed
Answer:
a model from which later versions are developed
Explanation:
When we refer to something as a prototype, it simply means that that thing is a model product based on which many more of its kind can be made.
When trying to design a new product, prototypes are often made and tested. If they pass all the required quality tests, more products can now be designed based on the original product.
Answer:
(d)
Explanation:
a model from which later versions are developed
____hybrid orbitals form when one s- and two p-orbitals mix. The resulting electron domain geometry is____ If one of the hybrid orbitals is filled with a lone pair of electrons, a _____ geometry forms when the atoms bond with other atoms.
Answer: 1. three sp2
2.trigonal planar
3. bent
Explanation:
edg
[tex]sp^2[/tex] hybrid orbitals form when one s- and two p-orbitals mix. The resulting electron domain geometry is trigonal planar. If one of the hybrid orbitals is filled with a lone pair of electrons, a bent geometry forms when the atoms bond with other atoms.
What are orbitals?A mathematical function depicting the wave nature of an electron or a pair of electrons present in an atom.
[tex]sp^2[/tex] hybrid orbitals form when one s- and two p-orbitals mixes. The resulting electron domain geometry is trigonal planar. If one of the hybrid orbitals is filled with a lone pair of electrons, a bent geometry forms when the atoms bond with other atoms.
Learn more about the orbitals here:
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Reactant A contains 40 J of energy, and Reactant B contains 33.5 J of energy. The reactants combine to form product AB, which contains 104 J of energy. What is the energy transformation?
a) Energy is absorbed because the product has more energy than the reactants have.
b) Energy is absorbed because the product the product has less energy than the reactants have.
c) Energy is lost because the product as more energy than the reactants have.
d) Energy is lost because the product has less energy than the reactants have.
Answer:
A
Explanation:
Energy is absorbed because the product has more energy than the reactants have.
lodine is 80% 1271, 17% 1261, and 3% 1281. Calculate the average atomic mass of
iodine.
Isotopes are members of an element family that have the same number of protons but differ in the number of neutrons.
Atomic mass of Iodine = 126.86 amu
What is a isotope ?Isotopes are members of an element family that have the same number of protons but differ in the number of neutrons.isotopes are a type of atom, the smallest unit of matter that retains all of an element's chemical properties. Isotopes are chemical elements that have unique properties.Isotopes can form either spontaneously (naturally) through radioactive decay of a nucleus (emission of energy in the form of alpha particles, beta particles, neutrons, and photons) or artificially (via accelerators or neutrons in a nuclear reactor) by bombarding a stable nucleus with charged particles via accelerators or neutrons.The elements in nature have several types of isotopes
Atomic mass is the average atomic mass of all its isotopes
MassAtomic mass of Iodine = 126.86 amu atom X = mass isotope 1 . % + mass isotope 2.% + ... mass isotope n.%
Atomic mass of Iodine = 0.8 x 127 + 0.17 x 126 + 0.03 x 128
Atomic mass of Iodine = 101.6 + 21.42 + 3.84
Atomic mass of Iodine = 126.86 amu
To learn more about : Isotopes
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can someone just help me?? I'm literally so confused on this. this is on electron configuration. the teacher tried to explain to me multiple times but i still don't understand
Answer:
you have to fill each boxes with upwards arrow first (↑) and followed by downwards arrow (↓) according to each element's atomic number
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
What is the mass number of an element equal to?
number of protons plus number of neutrons
number of electrons plus number of protons
number of protons
number of isotopes
When you remove energy from particles they move _____
and the matter _____
Answer: slower and closer together,
Explanation:
What percent of Earths feshwater is found as a solid?
Answer:
68.7% is the percent of frozen freshwater.
Which sample of matter is a single substance
A air
B ammonia gas
C hydrochloric acid
D Salt water
Answer:
B) Ammonia gas
Explanation:
Ammonia gas: It consists of only one molecule namely ammonia throughout the substance so it is a pure single substance.
The density of solid aluminum is 2.70 g/cm3. If a 1g piece of aluminum is dropped in a cup of water, what will happen to the aluminum? (The density of water is 1.00 g/cm3.)
Answer: c
Explanation: I took it
Answer:
IT WILL HOVER IN THE MIDDLE
Explanation:
With which group would group 18 most likely bond
Answer:
The noble gases (Group 18) are located in the right of the periodic table and were previously referred to as the "inert gases" due to the fact that their filled valence shells (octets) make them extremely nonreactivE
Explanation:
A glass of fresh milk with 1% fat is an example of..,
1) a compound
2) an element.
3) a homogeneous mixture.
4) a heterogeneous mixture.
Answer
the answer is a.element because nothing is with it
What is the density of the liquid in g/ml?
In what type of reaction or process does heat flow into the system?
combustion
exothermic
condensation
endothermic
The reactions in which flow of heat takes place into the system is known as endothermic process.
What is heat flow?Heat flow is a process in which transfer of heat takes place from one system to other or from outside to inside or vice-versa.
In in any chemical reaction for the completion of reaction if we have to absorb heat or flow of heat takes place from the outside into the system then that reaction is known as endothermic reaction.
Hence resultant process will be endothermic.
To know more about endothermic reaction, visit the below link:
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Answer D. endothemic
Explanation: just took the quiz
length is a fundamental quantity. give reason.
Answer:
Explanation:
There is a fundamental length, the Planck length. It is the length that light (a photon) travels in a unit of time called the Planck time and conforms to the way to measure length in general, as given by the equation
L = ct
Where L is length (or distance), c the speed of light (3 X 10^8 meters/sec), and t the time the light travels in. The Planck length is exceedingly small (magnitude 10^-35 meters because the Planck time is short (10^-44 sec)
The Planck length, or any length based on the speed of light, is not subject to the imprecision we would find by measurement with a physical ruler, for example, because a ruler can expand or shrink or be bent or warped, etc.
Rather, length based on c (in a vacuum) is constant. This concept is another gift from Einstein’s theory of special relativity. It’s also the central concept in spacetime, though it would take some explaining for me to say why it is so.
Qualitative Observations:
Quantitative
Observations:
Answer Qualitative Observations: were you gather info using your senses EX:(listening, touching ect.
qantitative observations: is a collection fo data or useing statistical and numerical analysis methods.
Is steel a compound or a mixture?
Help!
Which particle diagram represents the arrangement of F₂ molecules in a sample of fluorine at 95 K and standard pressure?
I'm pretty certain the answer is 2) because fluorine is a diatomic gas meaning it travels with 2 molecules (simplified). It is a gas so molecules should also be spread out so the answer cannot be 3) or 4).
Hope this helps! :)
Fluorine is a halogen that is the lightest and is highly toxic. Moreover, it exists in diatomic state.
At standard temperature and pressure, fluorine exists as gas.Fluorine exists as a diatom, i.e. [tex]F_{2}[/tex].It exists in gaseous form and thus, the molecules of this gas are far apart.Thus, it can be concluded that the particle diagram 2 best represents the fluorine gas in the given temperature and pressure.
Hence, the correct answer is option 2.
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Chromium-48 decays. After 6 half-lives, how much of the original nuclei would remain if we started with 600 g?
Answer:
1
Explanation:
2
How much hear must be obsorberd by 375.0 grams of water to raise its temperature from 10.0c to 35.0c? The specific heat capacity of water is 4.186 J/gC.
HELP DUE TOMORROW!!! ASAP
Answer:
The heat absorbed by water is 39243.75 J.
Explanation:
Given data:
Mass of water = 375.0 g
Heat absorbed by water= ?
Initial temperature = 10.0°C
Final temperature = 35.0 °C
The specific heat capacity of water = 4.186 j/g.°C
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
ΔT = 35°C - 10°C
ΔT = 25°C
Q = m.c. ΔT
Q = 375.0 g× 4.186 j/g °C × 25°C
Q = 39243.75 J
The heat absorbed by water is 39243.75 J.
which electron configuration represents excited excited state for a potassium Atom