Answer:
C
Explanation:
A molecule is a smallest particle of a substance that has all of the physical and chemical properties of that substance. or
Molecules are two or more atoms chemically joined together.
plss help :(((
What volume is indicated on each of the graduated cylinders below? The unit of volume is mL. Make sure to check the units of graduation to get the most accurate reading possible
Answer:
Explanation: The total volume (rock plus water) in the graduated cylinder is 34 mL. We know the volume of water in the cylinder was 20 mL. Therefore, the volume of the rock must be 14 mL. Because a milliliter is exactly the same volume as a cubic centimeter, the volume of the rock is 14 cm3.
Explanation:
Image result for The unit of volume is mL. Make sure to check the units of graduation to get the most accurate reading possible
Graduated cylinders have numbers on the side that help you determine the volume. Volume is measured in units called liters or fractions of liters called milliliters (ml).
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.
English
M.
3.x - 9
2r-7
.X + 2
18
Answer:
it will come answer 21 write
What are the periods and epochs of the Cenozoic era?
Please help!
Answer:
The Cenozoic Era is generally divided into three periods: the Paleogene (66 million to 23 million years ago), the Neogene (23 million to 2.6 million years ago), and the Quaternary (2.6 million years ago to the present); however, the era has been traditionally divided into the Tertiary and Quaternary periods.
A dehydration reaction (or condensation reaction) is the process in which _____. See Concept 5.1 (Page) View Available Hint(s)for Part A water molecules are produced as a polymer is formed from monomers the bonds between the individual monomers of a polymer are broken by the addition of water molecules water molecules are attracted to each other water molecules are used as a source of raw material to break down polymers to monomers None of the choices is correct.
A dehydration reaction (or condensation reaction) is the process in which water molecules are produced as a polymer is formed from monomers.
A chemical reaction is the process by which substances called reactants are transformed to another substance known as products through the breaking up or building up of bonds between the reactants.
There are different types of chemicals reaction which includes condensation reaction.
Condensation reaction involves the combination of two smaller molecules known as monomers to for one larger molecule known as polymer with the loss of water molecule.
Condensation reaction is specifically called dehydration reaction due to the loss of water molecule that is involved.
Therefore, a dehydration reaction (or condensation reaction) is the process in which water molecules are produced as a polymer is formed from monomers.
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11. Jack placed his new birthday helium balloon into the freezer. Will the balloon expand or shrink?
Describe what would happen to the helium gas particles. Be sure to include information about the gas
particle movement, volume (space between particles), and pressure.
Answer:
The balloon will shrink bcuz the average kinetic energy of the helium gas particles in the balloon decreases when the temp decreases. This makes the molecules move more slowly and have less frequent and weaker collisions with the inside wall of the balloon. The pressure will also decrease bcuz air pressure is the total force per unit area
Label each of the following 15 samples of matter as one of the following:
The scientific method is
cyclic
linear
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.
if the element A have three protons in the nucleus. find the atomic number of the element A
Answer:
ATOMIC number of element A is 3
Explanation:
Atomic number is the same as number of protons of an element.
according to the periodic table, Lithium is the element with 3 protons in its neutral state and it's atomic number is 3.
Flowing water eroding a limestone riverbed
a
Chemical Change
b
Physical Change
Answer:
physical change
I hope it's helps you
what is electron configuration?
Answer:
electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
Pb(NO3)2 + ? = PbCl2 +?
Answer:
HCL, H2
Explanation:
Assuming this is a Redox reaction, we know that metal + acid = salt + hydrogen therefore we can say it is HCL and H2
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
What makes modern chemistry different from alchemy and other ancient chemical practices of pre-modern humans?
Answer:
Alchemy was based more on experimentation and had little basis in science. Chemistry utilizes both experimentation and scientific practices. Modern chemistry basically relies on scientific theories and experimental results, but the alchemy was a blend of myths, religion, magic, astrology, philosophy, and spirituality.
Which of these are PHYSICAL changes?
А.
cutting, tearing, freezing, thawing, folding.
mixing without chemical changes
B.
burning, rusting, forming a new substance from
two different substances, exploding, cooking
Answer:
the answer to this problem is a
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!
Through _
plants move enormous quantities
of water from soil to air .
Explanation:
The water eventually is released to the atmosphere as vapor via the plant's stomata — tiny, closeable, pore-like structures on the surfaces of leaves. Overall, this uptake of water at the roots, transport of water through plant tissues, and release of vapor by leaves is known as transpiration
Through transpiration, plants move enormous quantities of water from the soil to the air.
Transpiration is the process by which plants lose water vapor through small openings called stomata in their leaves. Water is taken up by the roots from the soil and transported to the leaves through the xylem vessels. Once in the leaves, water evaporates from the surface of the cells and exits through the stomata into the surrounding air.
This continuous loss of water through transpiration creates a pulling force, known as the transpiration pull or tension, which helps to draw water upward from the roots. As water molecules evaporate from the leaves, more water is pulled up through the plant's vascular system to replace the lost water.
Transpiration not only aids in the transport of water and nutrients from the roots to the rest of the plant, but it also plays a crucial role in regulating the plant's temperature, maintaining cell turgidity, and facilitating the movement of minerals within the plant.
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in which sell duplet rule is applied, why?
Answer:
its in explanationExplanation:
the tendency for items have 2 electrons in their outermost shell by interacting with others items through electron sharing or transfer is known as duplet rule. if an atom has 2 electrons in it's outermost shell then it is called duplet rule and if a 8 electrons in it's outermost shell than it is called octet rule .
calculate the mass of 2×10^25 molecules of water?
Answer:
36.04g H2O
Explanation:
2 moles H2O converted into grams using the mass of a mole of water as grams (1.01 x 2 + 16.00 = 18.02g = 1 mole h2o) is 36.04g
i can try to explain further if you want?
Chemical name of my atom
Answer:
dd
Explanation:
dddddddddddddddddddddddddddddddddddddd
In two atoms atom 'X' looses two electrons and atom 'Y' gains two electrons to form a compound 'XY'.Name the bond formed between X and Y.With two properties of the compound.
Please help me and i will mark you as brainleist.
Answer:
The bond formed between XY is "Ionic bond"
Explanation:
The bond is ionic bond because the compound XY is formed due to the gaining and loosing of electrons
Properties of Ionic compounds:
They form crystals
They are good insulators
They have high melting and boiling points
.
.
.
Hope it helps
Convert to standard notation.
9.3 x 10^-5
Answer:
9.3 x 10^ -5 in standard notation is 0.000093
Explanation:
Since 10 is raised to a -5, this means that there should be 5 zeros before the non-zero digits
The periodic table below shows major regions in different colors. Which answer choice describes the noble gases?
A. All of the elements of Period 1 in orange boxes
B. The two separate rows of elements in dark and light blue boxes at the bottom
C. All of the elements in green boxes
D. All of the elements of Group 18 in orange boxes
Answer:
D. all of the elements of Group 18 in orange boxes
How to convert 104 Km to M
Answer:
m=104000
Explanation:
by 1km=1000m
104km=?
Now
104km=104×1000m
=104000m
Therefore,m=104000 ans
104 kilometers is equal to 104,000 meters.
A conversion factor is a ratio that shows how two different units of measurement relate to each other. You can convert a value from one unit to another by multiplying or dividing the original value by a conversion factor.
For example,
Since there are 1000 meters in a kilometer, we need to multiply the distance in kilometers by 1000 to convert it into meters.
So, to convert 104 kilometers to meters:
104 Km * 1000 = 104,000 meters
Therefore, 104 kilometers is equal to 104,000 meters.
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32,235 kg/1991 m3 solve in scientific notation
Answer:
jrikgni
Explanation:j
55
What should a prepositional phrase include after the preposition?
A.a noun and its modifiers
B.an adjective and an adverb
C.a subject and a predicate
D.an object and its modifiers
Answer:
B
Explanation:
A prepositional phrase should include after the preposition an object and its modifiers. The correct option is D.
What are prepositional phrases?A prepositional phrase is a group of words that contain a preposition with its object and the words that modify it. These are the words that change verbs and nouns.
For example, Mansi is going out with handsome Brian. Brian is the object and the beautiful is the prepositional phrase. The three types of prepositional phrases are:
Adverb prepositional phrases.Adjective prepositional phrases.Prepositional phrases, behave as nouns.If there are two prepositional phrases used in one sentence. The other prepositional phrase will be used as an adverb.
Thus, the correct option is D. an object and its modifiers.
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In what condition do iodine and phosphorus react?
Answer:
reaction of phosphorus with the helegones
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
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.