Answer:
5000mm
Explanation:
10mm makes 1 cm
so if we compare them:
10mm-->1cm
x -->500cm
now cross multiply:
1x-->5000
divide both sides by 1 for x to be alone
therefore we get x=5000
How many joules of energy are required to melt 423g of water at 0°C?
Answer: hope this helps mark me BRAINLEST plz ;)
Explanation:42. Practice Problem How many joules of energy are required to vaporize 423g of water at 100oC and 1atmosphere of pressure. q = mHv m = 423 g Hv = 2260 J/gq = (423g) (2260J/g) = 955,980 J = 956 43. Table T – Heat Formulas
The amount of heat needed to melt 423 g of water at 0°C is 141282 J
The heat required to melt water can be obtained by using the following formula:
Q = mLQ is the heat required.
L is the latent heat of fusion (334 J/g)
m is the mass.
With the above formula, we can obtain the heat required to melt the water as illustrated below:
Mass of water (m) = 423 g
Latent heat of fusion (L) = 334 J/g
Heat (Q) required =?Q = mL
Q = 423 × 334
Q = 141282 JTherefore, the amount of heat needed to melt 423 g of water at 0°C is 141282 J
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How many moles are in 6.20 x 10^24 molecules of H2O?
Answer:
10.3 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{6.20 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 10.299003[/tex]
We have the final answer as
10.3 molesHope this helps you
Cual es la convención de 746 Hm
Answer:
75.6
Explanation:
756x0.1=75.6
1 d =hm=0.1
Which of the following is an observation of a chemical property?
zinc reacts with hydrochloric acid
water boils at 100°C.
density of wood is 0.51 g/cm3
sand paper is roughly textured
3. A sample of carbon has a mass of
0.000000000000000-0034 kg. Express
this mass in scientific notation.
[tex] - 34 {}^{15} [/tex]
The power of -34 will be 15 because 15 zeroes are given....carbon dioxide + Calcium Carbonate =?
Answer:
calcium carbonate deteriorates, delivering carbon dioxide gas and leaving behind calcium oxide a white solid. Over the long haul, this responds with carbon dioxide noticeable all around to frame gems of calcium carbonate, which lock the sand grains together to shape a hard rock-like material
Explanation:
Answer:
calium bicarbonate
Explanation:
What charge would an ion have if it had more electrons than protons?
A. It would have a net positive charge.
OB. It would have no charge.
C. It would have a net negative charge.
Ο Ο
D. It would be neutral, since electrons would be outside the nucleus.
Answer:
it will have a net negative charge and it is known as anion
*20 points* Pls answer questions in a positive way NO LINKS NO FILES Thank you
Answer:
A compound is a substance made of two or more different atoms which are chemically combined(Option B)A mixture is made of two or more substances that are not chemically combined (OptionB)Explanation:
Example of compound(CO)
Example of mixture(Milk)
Help please 20 points and brainliest
Answer:
For homogeneous:
Filteration, vaporization, and a reverse chemical reaction
Explanation:
1) precipitation/crystallization reactions - if one of the components can form a solid salt when the solution undergoes several factors (concentration change, temperature change, etc); separation can be done either by filtration, centrifugation, or simple decantation.
(2) chromatography - separation can be based on the mobility of the phases (liquid chromatography, gas chromatography, ion-exchange, etc.)
(3) solvent extraction - if the components are both liquid, separation based on their relative solubilities
(4) distillation - separation based on different boiling points.
(5) magnetic separation - if one of the components have magnetic properties.
(6) electrophoresis - separation of organic molecules based on the type of gel used
heterogeneous:
Main methods of separation of heterogeneous mixtures
- Magnetic separation
- Sublimation
- Decantation
Liquid-solid mixture
Liquid-liquid mixture
- Filtration
- Centrifugation
Themes of interest
The electronegativity of an atom generally _____ going up columns and _____going right to left across rows. An element like calcium
would most likely form a(n) _____ bond with an element like nitrogen.
1. increases: increases: covalent
2. increases; increases : ionic
3. increases; decreases : ionic
4. decreases; decreases ionic
5. decreases: increases : ionic
6. decreases; increases covalent
7. decreases; decreases covalent
8. increases; decreases : covalent
Answer:
8
Explanation:
It increases going up, because atom size is smaller, with greater energy levels; going right to left decreases, because they will have smaller charges when going through right to left.
Then, Calcium (Ca) is non-metal that reacts with Nitrogen (N), a non-metal. When 2 non-metal elements become a compound, it's covalent. Therefore, the bond between both of the elements are covalent.
Which sphere protects Earth’s surface?
atmosphere
biosphere
geosphere
hydrosphe
Answer:
Hiii
Explanation:
Your answer is Atmosphere
The atmosphere protects life on Earth by absorbing ultraviolet solar radiation and warming the surface through heat retention (the greenhouse effect). The atmosphere is further classified into multiple layers by temperature, which include the thermosphere, the mesosphere, the stratosphere, and the troposphere.
Hope it helps:)
The energy of motion is known as potential energy.
Question 1 options:
True
False
Answer:
False
Explanation:
This is because potential energy is energy that it not used yet.
5. _______ is the combining capacity of atom with other atoms to form a molecule or a compound .
Answer:
valancy
Explanation:
I will brainless who can answer this all pleaseeeeej
Answer:
cracks in the road, hot air balloons, tire bursts
Explanation:
cracks in the road: the road expand on heating
hot air balloons: Because the hot air inside the balloon bag increases in size faster than the container it stretches the bag so that it expands and displaces the colder (heavier) air outside the bag
tire bursts in hot days when filled full of air due to thermal expansion
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Which property accounts for the fact that atoms can be identified by an examination
of the emission spectrum?
A. Each kind of atom has a different mass number.
B.Each kind of atom has a different atomic number.
C.Each kind of atom has a different isotopes.
D. Each kind of atom has a characteristic difference in energy levels for electrons.
Answer:
Explanation:
D is the answer
Each kind of atom has a characteristic difference in energy levels for electrons, this property accounts for the fact that atoms can be identified by an examination, therefore the correct answer is option D.
What is the photoelectric effect?It is the process of emission of electrons from the material because of absorption of electromagnetic radiation in form of photons of light waves.
The photoelectric effect explains the particle behavior of the light waves.
Each kind of atom has a characteristic difference in energy levels for electrons this fact can be used to identify the different atoms by using inspection.
Thus, the correct answer is option D.
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What do all cations have in common? Check all that apply.
A. positive
B. negative
C. metals
D. non-metals
Answer:
B
Explanation:
All cations have more protons than electrons so they always have a positive charge.
9 ml of a sugar solution was mixed with 3 ml of a 76% sugar solution to make a 73% sugar solution. Find the percent concentration of the first solution.
what is the density of a object that has a volume of 8 ml and a mass of 22 grams?
Answer:
The density of the object is 0.32gcm3.
Explanation:
hope this helps
Which of the following elements is an Alkali Metal?
A) Lithium
B) Neon
Fluorine
D Beryllium
can someone help me plz
Answer:
what do you need help with?
Explanation:
Answer:
Hello brainly user! You did not provide a question for us to help you with! In order for someone to help you, you need to provide the question you are in need of help for. What's your question?
Density is a ___ that ____ the ____ of an object to its ______
Answer:
matter , equals , weight , size
Which is not the correct grouping of elements? (Refer to periodic table)
A. Argon, potassium, slicon, strontium
B. Darmstadtum, nickel, piatinum, palladium
C. Barum berrylium, calcium, radium
D. Cesium, hydragon, lithium, sodium
Please help me guys..I need the answer ASAP!..(｡ŏ﹏ŏ)(╥﹏╥)
The incorrect grouping of elements is Argon, potassium, slicon, strontium.
What is periodic table?Periodic table is a systematic arrangement of chemical elements within the coloums and rowns on the basis of their properties.
In all options given elements belongs from the same group except the first one, beacuse in argon, potassium, silicon & strontium all are present in different groups of periodic table. As argon is present in the 18th group, potassium is present in the 1st group, silicon is present in the 14th group and strontium is present in the 2nd group of the periodic table.
Hence, correct option is (A).
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How bad of alcoholic do you have to be to have your brain affected
Answer:
Alcohol in Your Body
Alcohol reaches your brain in only five minutes, and starts to affect you within 10 minutes. After 20 minutes, your liver starts processing alcohol. On average, the liver can metabolize 1 ounce of alcohol every hour.
Explanation:
hope that helps you i just love sharing glmv sorry
Which have different numbers of electrons?
different ions of an element
different isotopes of an element
the nucleus of an element
each of the atoms of an element
Answer: different ions of an element, the answer is A
Explanation: Took the quiz
Answer:
different ions of an element, the answer is A
Explanation:
edge 2022
Kinetic energy in the form of moving waves of light or radiation
Answer:
radiation
Explanation:
Answer:
neither
Explanation:
Kinetic Energy is the physical movement of objects.
Who created the "plum pudding model" of the atom?
Thomson
Rutherford
Crooks
Chadwick
1 An atom has 24 protons, 22 electrons, and 28 neutrons. What is the atomic number of the atom?
Answer:
24
Explanation:
with increasing altitude, air density also increases... true or false
Answer:
false
Explanation:
how does electron-pair repulsion determine the molecular shape?
Answer:
The shape of a covalent molecule can be predicted using the Valence Shell Electron Pair Repulsion (VSEPR) theory. Very simply, VSEPR theory says that the valence electron pairs in a molecule will arrange themselves around the central atom (s) of the molecule so that the repulsion between their negative charges is as small as possible.
Explanation:
There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. Electron-pair repulsion play an important role in determining the molecular shape using VSEPR theory.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
The shape of a covalent molecule can be predicted using the Valence Shell Electron Pair Repulsion (VSEPR) theory. VSEPR theory says that the valence electron pairs in a molecule will arrange themselves around the central atom (s) of the molecule so that the repulsion between their negative charges is as small as possible.
Therefore, electron-pair repulsion play an important role in determining the molecular shape using VSEPR theory.
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