Answer:
Chemical change
Explanation:
Because a new substance is formed.
English
M.
3.x - 9
2r-7
.X + 2
18
Answer:
it will come answer 21 write
How much energy is required to heat 2kg of ice from -5°c to 0°c
Explanation:
total heat = Heat required to convert 2 kg of ice to 2 kg of water at 0 °C + Heat required to convert 2 kg of water at 0 °C to 2 kg of water at 20 °C.
Heat=mhfg+mCpΔT
Here, m ( mass of ice) = 2 kg
hfg (latent heat of fusion of ice) = 334 KJ
Cp of water (specific heat) = 4.187 KJ/Kg-K
ΔT(Temperature difference) = 20 °C
Therefore, Heat required = 2 x 334 + 2 x 4.187 x (20 - 0 )
Heat reqd= 835.48 KJ
Therefore, to melt 2 kg of ice 835.48 KJ of heat is required.
Label each of the following 15 samples of matter as one of the following:
All the following process produces hematite except
A roasting of siderite
B oxidation of iron
C oxidation of magnetite
D drying of limonite
E no correct answer
Answer:
D)driying of limonite these is the answer
10) Convert 0.075 km to mm.
hi <3
for this conversion, you need to multiply by 10^6
thus, your answer would be 75000 mm
hope this helps :)
32,235 kg/1991 m3 solve in scientific notation
Answer:
jrikgni
Explanation:j
55
if you are asked to help the laboratory assistant in separating the mixture which method will you see?
Answer:
use secondary data. the normal method to use
Someone plz help me :(
hey i got some chem for you guys
Answer:
C. Equal toExplanation:
As,
Law of reflection states that , angle of incidence is always equal to angle of reflection.
Hello guys can you help me on this.
Answer:
1.Sulfur dioxide and nitrogen oxide
2.a)it forms carbonic acid
b)
3.the community can use renewable energy like solar and wind power cause they produce less pollution
A hydrogen electron is elevated from level 1 to level 2. Another electron is elevated from level 2 to level
4. The transition requiring the greatest energy change is
DONE
Intro
Answer
level 2 to 4
Explanation:
i guessed cause im just that cool
The main difference between strong electrolytes and weak electrolytes is....
A. their jawline.
B. how much weight they can lift.
C. how smelly of a cheese they make.
D. how much they dissociate.
What are the two differences between mass and weight?
The amount of energy required to separate 1 mole of ions in a crystalline solid into separate gaseous ions is called _____ energy. This energy provides a measure of the strength of a(n) _____ bond, since the stronger the bond, the _____ the amount of energy required to break it.
Answer: A) Are you asking for the production of "ions" from a solid? Or are you asking for the formation of gases. For gases, this is called "energy of vaporization."
B) "Lattice," I am guessing.
C) Greater
Explanation: Most molecules enjoy their existance as solids (not all) due to the intermolecular forces that attract the molecules to each other. These are largely hydrogen and ionic bonds. Hydrophobic compounds don't always share this enthusiam to stick together. Gasoline is happy to leave it's relatives behind and it's Up, Up, and Away.
Nate and Vic are trying to determine the atomic mass of the atom shown below. Nate thinks it has an atomic mass of 11 u, while Vic thinks it has an atomic mass of 6 u. Who is correct and why?
A. Nate is correct. An isotope’s atomic mass is based on the number of protons and neutrons in the nucleus.
B. Vic is correct. An isotope’s atomic mass is based on the number of electrons in the electron cloud.
C. Vic is correct. An isotope’s atomic mass is based on the number of protons in the nucleus.
D. Neither is correct. The atomic mass is based on the number of neutrons in the nucleus. This isotope’s atomic mass is 5 u.
Answer: A is correct. I don't see the "element shown below," but it isn't needed to answer this question.
Explanation: By definition, the atomic mass is based on the sum of protons (1 AMU each) and neutrons (1 AMU each). Electrons are assigned a value of 0 AMU.
Heisenberg's uncertainty principle stats that's isn't possible to know the exact momentum and _______ of a particle simultaneously. In terms of atomic structure, this means that we can't determine fixed ________ for electrons but can only determine the _________ of finding an electron in a given region of space.
Chewing food to break it down into smaller particles represents a physical change, but the charging of starch into sugars by enzymes in the digestive system represents a chemical change.Chemical or physical change?
Answer:
Chemical changeExplanation:
The charging of starch into sugars by enzymes in the digestive system shows a chemical change.[tex]\tt{ \green{P} \orange{s} \red{y} \blue{x} \pink{c} \purple{h} \green{i} e}[/tex]
What is the overall charge of the
nucleus?
A. positive
B. negative
C. neutral
Which of the following is NOT an alternative source of energy?
A: Water
B: Wind
C: Sun
D: Plants
Which of these is about the same size and mass as a CARBON proton?
A.
electron
B.
neutron
Neutrons and protons are almost exactly the same size
Explanation:
(a neutron has about 1/10th of one percent more mass). ... Carbon has 6 protons, so its atomic number is 6; oxygen has 8 protons, so its atomic number is 8. Uranium has 92 protons, so its atomic number is 92!
Answer:
neutrons
Explanation:
it’s for Acellus
Write a scientific explanation to explain how atoms, molecules, and extended structures make up substances.
Explanation:
pure substance are made up of a bulk quantity of individual atom are molecules each pure substance in made up of one of individual atom of the same type that are connected to a form extended structure molecules of different type of atoms that are not attracted to each other eh carbon dioxide
Same type of atoms are bound to form molecules, these molecules are joined to form larger pure compound.
What do you mean by atom and molecule ?Atoms are the smallest and basic units of matter which has three subatomic particles such as positively charged protons, neutral Neutrons form nucleus.
A negatively charged electron which surround the nucleus of the atom.
The nucleus does not change during chemical reactions, only in nuclear reactions it will change.
In nucleus equal number of protons and neutrons, atomic number is the number of protons and atomic mass is made of the sum of protons and neutrons.
Smaller electrons orbit the nucleus participate in chemical reactions .
A molecule is defined as two or more atoms bonded together by different bonds like ionic, covalent, electrostatic, coordinate bonds.
Examples of molecules includes carbon dioxide, water, ammonia, glucose etc.
Learn more about atom, here:
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Why the volume of a gas is not measured immediately after it is collected?
Answer:
Collecting gas over waterWhen collecting oxygen gas and calculating its partial pressure by displacing water from an inverted bottle, the presence of water vapor in the collecting bottle must be accounted for; this is easily accomplished using Dalton’s Law of Partial Pressures.
A _______ is a substance used during electrolysis that splits apart and is attracted to an oppositely charged electrode
Answer:
electrolyte
Explanation:
Explain how you can obtain hydrated sodium sulphate crystals from an aqueous solution of sodium sulphate
Answer:
If you left your aqueous sodium sulfite solution open on the side, atmospheric oxygen would cause the chemical change, the water would hydrate the new compound and the slow evaporation of water would give you lovely large crystals of Na2SO4 without you having to do anything!
Answer:
If you left your aqueous sodium sulfite solution open on the side, atmospheric oxygen would cause the chemical change, the water would hydrate the new compound and the slow evaporation of water would give you lovely large crystals of Na2SO4 without you having to do anything!
If zinc has an atomic number of 30 and a mass number of 65 what is the correct number of protons neutrons and electrons ?
Answer:
protons 30
neutrons 35
electrons 30
71. The density of osmium (the densest metal) is 22.57 g/cm². If a
1.00-kg rectangular block of osmium has two dimensions of
4.00 cm x 4.00 cm, calculate the third dimension of the block.
Answer:
y = 2.77 cm
Answer: The third dimension is 2.77 cm
Which hypothesis is most supported by astronomers?
The universe is currently expanding and will continue to expand.
Stars could burn out, causing the universe to become dark and cold.
Gravity could pull galaxies back together, causing a reverse of the big bang.
Dark energy will pull the universe together to form a massive black hole.
Answer:
Once I read a NASA post where they were saying that the universe keeps expanding as matter keeps forming and cooling down thus adding to the size of the universe so keeping this in mind, the best answer choice is, option A. The universe is currently expanding and will continue to expand.
The hypothesis which is most supported by astronomers is that universe
is currently expanding and will continue to expand.
Who are Astronomers?They are scientists which study planets, stars, and other celestial bodies.
They have strong beliefs on Big bang theory.
The theory states that the Universe was formed as a result of a big bang in
which one point began to expand . This is why option A is the most
appropriate.
Read more about Astronomers here https://brainly.com/question/10826203
Express the following quantities in scientific notation. A. 5,453,000m B. 300.8kg C. 0.00563ng D. 0.0120325km E. 34,800s F. 332,080,000cm G. 0.0002385ms H. 0.3048mL
Answer:
uu
Explanation:
uwu 44
The standard scientific notation is expressed as A * 10^n where:
A is an integer between 1 and 10
n is an integer
Given the value 5,453,000, expressing in standard form is expressed as:
5,453,000 = 5.453 * 10⁶ m(Note that the decimal point at the back was shifted backwards 6 times)
B) 300.8kg
In this case, the decimal point will be shifted backwards 2 times to have:
3.008 * 10² kg
C) 0.00563ng
In this case, the decimal point will be shifted to the front 3 times to have:
5.63 * 10⁻³ng
D) For 0.0120325km
In this case, the decimal point will be shifted to the front 2 times to have:
1.203 * 10⁻²km
E) For 34,800s
In this case, the decimal point will be shifted backwards 4 times to have:
3.48 * 10⁴s
F) For 332,080,000cm
In this case, the decimal point will be shifted backwards 8 times to have:
3.32 * 10⁸cm
G) For the value 0.0002385ms
In this case, the decimal point will be shifted to the front 4 times to have:
2.385 * 10⁴ms
H) For the value 0.3048mL
In this case, the decimal point will be shifted to the front 1 time to have:
3.048 * 10¹mL
Learn more here: https://brainly.com/question/19066506
Round the following number to 2 significant figures:
94.5
Answer:
95
Explanation:
94.5 contains 3 significant figures so to round it to just two, we can just round the number to the nearest whole number. Remember that we round up if we have 5 and up then we would round down if we have 4 and below.
94.5 → 95
Best of Luck!
during the interconversion of state of matter, mass undergoes and change? true or false
True.
The Mass Undergoes change only in ( Solid state to liquid state ) Ice Cube to Water .
Mass changes from mg to litre.
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