Answer:
latent heat of condensation will have the same absolute value as the latent heat of vaporization. The latent heat of condensation will be negative. The latent heat of condensation is a characteristic property that can be used to identify a substance.
Explanation:
Answer:
energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature.
Explanation:
Base your answer on the information below. Polonium-210 occurs naturally, but is scarce. Polonium-210 is primarily used in devices designed to eliminate static electricity in machinery. It is also used in brushes to remove dust from camera lenses. Polonium-210 can be created in the laboratory by bombarding bismuth-209 with neutrons to create bismuth-210. The bismuth-210 undergoes beta decay to produce polonium-210. Polonium-210 has a half-life of 138 days and undergoes alpha decay. Determine the total mass of an original 28.0-milligram sample of Po-210 that remains unchanged after 414 days. Show the math setup, the arrows, and your answer for full credit.
Answer:
3.5 milligram
Explanation:
From;
N/No = (1/2)^t/t1/2
Where;
N = amount of Po-210 that remains unchanged after 414 days
No = 28.0 milligram of Po-210 originally present
t = 414 days
t1/2 = half life of Po-210 = 138 days
Substituting values;
N/28 = (1/2)^414/138
N/28 = (1/2)^3
N/28 = 1/8
8N = 28
N = 28/8
N = 3.5 milligram
Which is not true of the ideal gas law?
-For a given amount of gas held at constant temperature, the product of pressure and
volume is constant.
-It describes the behavior of an ideal gas in terms of the pressure, volume,
temperature, and number of moles of gas present.
-None of the above.
-The value of R is 0.082.1 L.atm/mol.K.
Answer:
For a given amount of gas held at constant temperature, the product of pressure and
volume is constant.
:
Molecules in the thermosphere are fast moving because
A.
no gravity to slow them down
B.
they have nothing to bump into
C.
they are pulled by the Sun's gravity
D.
of radiation absorption
Answer:
i think a or b
Explanation:
Ag, CO,
Find out the stock system thank you
Answer:
a system in chemical nomenclature and notation of indicating the oxidation state of the significant element in a compound or ion by means of a Roman numeral that is used in parentheses after the name or part of the name designating this element and ending invariably in -ate in the case of an anion and that is placed. Stock nomenclature for inorganic compounds is a widely used system of chemical nomenclature developed by the German chemist Alfred Stock and first published in 1919. In the "Stock system", the oxidation states of some or all of the elements in a compound are indicated in parentheses by Roman numerals.
Explanation:
Brainliest please?
MARKING BRAINLIEST!
Many processes occur in the digestive system. Which process is best classified as a physical change?
A. digestive enzymes breaking down proteins into smaller fragments
B. teeth grinding an almond into smaller pieces in the mouth
C. bacteria converting lactose into simple sugars in the intestines
D. saliva converting the starch molecules in crackers into simpler sugars
Answer:
Teeth gridning
Explanation:
BC YOUR GRINDING IT
group viia elements are very active non metals give reason
Answer:
because they need only one electron
If there is less ionization energy does that mean that it is more reactive? Why?
Answer:
The greater the ionization energy, the more difficult it is to remove an electron. The ionization energy may be an indicator of the reactivity of an element. Elements with a low ionization energy tend to be reducing agents and form cations, which in turn combine with anions to form salts.
can someone help me with the unanswered questions pls sorry about bad quality
Answer:
I cant see it sorry
Explanation:
What is the difference between a plain and a plateau? A. Only a plain is flat, a plateau is steep mountainside. B. Both are flat, but a plateau is bordered by cliffs. C. A plain is rolling hills with cliffs, and a plateau is large flat area.
Answer:
B
Explanation:
Both plain and plateau have flat surfaces. However, a plain is located in a low-lying area while a plateau is located on an elevated area. In essence, a plateau can be viewed as an elevated plain or a plain that is bordered by cliffs.
The correct option is B.
A diagram represents the life cylce of a frog. The diagram shows that, in a frog...
1) methods of sexually reproduction depends on the species
2) metabolism is the sum of all chemical reactions
3) body structures change during development
4) Offspring always look like the adult
PLEASE HELP AND ANSWER
Answer:
I think 1 option ok basically I am a scientist
Answer:
(3)
Explanation:
Does the following equation follow the law of conservation of mass? Show your work
AgNO3 → Ag2 + NO3
Answer:
No.
Explanation:
If the equation follows the law of conservation of mass, then the amount of reactants must be equal to the amount of products. That is not the case for the provided equation due to 1 Ag on the reactants side versus 2 Ag on the products side.
what mineral is least important to plant growth
a. Nitrogen
b. Phosphorus
c. Potassium
d. Sodium
Answer:
sodium
Explanation:
nitrogem, phosphorous and potassium are very important to plant growth, but sodium isnt necessary.
Answer:
the answer is sodium hope this helps
Oil and water placed in a jar will separate. Even when shaken and mixed, the oil still separates from the water.
Which best describes oil and water?
Oil and water are highly soluble because they have separate chemical properties.
Oil and water have a low solubility because they have separate chemical properties.
Oil and water are highly soluble because they exert different pressures.
Oil and water have a low solubility because they exert different pressures.
Answer:
Probably B?
Explanation:
I don't have one...
Hope it helps I guess..
Answer: i think is B
Explanation: HATE ME IF IM WRONG
Please answer this...
How do you find the amount of moles is .032 grams of water and whats the answer
Answer:
[tex]\boxed {\boxed {\sf 0.0018 \ mol \ H_2 O }}[/tex]
Explanation:
First, we need to find the molecular mass of water (H₂O).
H₂O has:
2 Hydrogen atoms (subscript of 2) 1 Oxygen atom (implied subscript of 1)Use the Periodic Table to find the mass of hydrogen and oxygen. Then, multiply by the number of atoms of the element.
Hydrogen: 1.0079 g/mol Oxygen: 15.9994 g/molThere are 2 hydrogen atoms, so multiply the mass by 2.
2 Hydrogen: (1.0079 g/mol)(2)= 2.0158 g/molNow, find the mass of H₂O. Add the mass of 2 hydrogen atoms and 1 oxygen atom.
2.0158 g/mol + 15.9994 g/mol = 18.0152 g/molNext, find the amount of moles using the molecular mass we just calculated. Set up a ratio.
[tex]0.032 \ g \ H_2 O* \frac{ 1 \ mol \ H_2 O}{18.0152 \ g \ H_2 O}[/tex]
Multiply. The grams of H₂O will cancel out.
[tex]0.032 * \frac{1 \ mol \ H_2 O}{18.0152 }[/tex]
[tex]\frac{0.032 *1 \ mol \ H_2 O}{18.0152 }[/tex]
[tex]0.00177627781 \ mol \ H_2 O[/tex]
The original measurement given had two significant figures (3,2). We must round to have 2 significant figures. All the zeroes before the 1 are not significant. So, round to the ten thousandth.
The 7 in the hundred thousandth place tells us to round up.
[tex]0.0018 \ mol \ H_2 O[/tex]
There are about 0.0018 moles in 0.032 grams.
A. 207 kJ
B. 4730 kJ
O C. 9460 kJ
O D. 414 kJ
Answer:
C = 9460 Kj
Explanation:
Given data:
Mass of copper = 2kg
Latent heat of vaporization = 4730 Kj/Kg
Energy required to vaporize 2kg copper = ?
Solution:
Equation
Q= mLvap
by putting values,
Q= 2kg × 4730 Kj/Kg
Q = 9460 Kj
Clay and Pumice have pores but the pores are not well connected. If you poured water over either of them it would just run off the surface. It wouldn't run through. But they could hold water in their pores. We can say then that both or them ARE ___________________ but NOT __________________________________.
Answer:
Clay and Pumice can both be said to be Porous but they are not Permeable
Explanation:
A porous substance is one which have pores in in through which air or liquid can pass through. Both clay and pumice are porous due to the presence of pores in them. These pores allow air to pass through them. However, since the pores are not well connected water do no pass through them. As a result, clay vessels can hold water within them and pumice floats on water.
Permeability is the ability of a substance to allow other substances to pass through. Both clay and pumice have low permeability, as a result they do not allow water to pass through them. Rather, water runs over their surface when poured over them.
Answer:
Clay and Pumice can both be said to be Porous but they are not Permeable
Explanation:
One isotope of a nonmetallic element has mass num- ber 127 and 74 neutrons in the nucleus. The anion derived from the isotope has 54 electrons. Write the symbol for this anion.
Answer:
I⁻
Explanation:
The identity of the element is obtained when the proton number is known.
Mass Number = 127
Neutrons = 74
Number of protons is obtained from;
Protons = Mass Number - Number of Neutrons
Protons = 127 - 74 = 53
The element is Iodine and it's symbol is I.
However, The anion derived from the isotope has 54 electrons
A neutral Iodine should have 53 electrons. This means it has gained a single electron. The symbol is now written as;
I⁻
#1 - What is a pure substance? *
1 point
two or more atoms held together by chemical bonds
the attractive force that holds atoms together
a sample of matter that has specific chemical and physical properties
a pure substance made up of two or more different types of atoms joined by chemical bonds
#2 - TRUE OF FALSE: Water is a pure substance.
1 point
True
False
#3 - What is an atom? *
1 point
the smallest unit of an element that keeps the properties of that element
the attractive force that holds atoms together
a sample of matter that has specific chemical and physical properties
a pure substance made up of two or more different types of atoms joined by chemical bonds
#4 - What is a molecule? *
1 point
two or more atoms held together by chemical bonds
the attractive force that holds atoms together
a sample of matter that has specific chemical and physical properties
a pure substance made up of two or more different types of atoms joined by chemical bonds
#5 - What is a chemical bond? *
1 point
two or more atoms held together by chemical bonds
the attractive force that holds atoms together
a sample of matter that has specific chemical and physical properties
a pure substance made up of two or more different types of atoms joined by chemical bonds
#6 - TRUE OR FALSE: Molecules are all the same size. *
1 point
True
False
#7 - What is a compound? *
1 point
two or more atoms held together by chemical bonds
the attractive force that holds atoms together
a sample of matter that has specific chemical and physical properties
a pure substance made up of two or more different types of atoms joined by chemical bonds
#8 - TRUE OR FALSE: Compounds never form in a fixed ratio. *
1 point
True
False
#9 - TRUE OR FALSE: The structure of matter at the atomic and molecular levels is too small to observe directly. *
1 point
True
False
#10 - TRUE OR FALSE: A complex molecule may contain a few atoms bonded together. A simple molecule may contain thousands of atoms. *
1 point
True
False
#11 - What is a crystal? *
1 point
two or more atoms held together by chemical bonds
a substance in which the particles are arranged in an orderly, geometric, and repeating pattern
a sample of matter that has specific chemical and physical properties
a pure substance made up of two or more different types of atoms joined by chemical bonds
#12 - TRUE OR FALSE: Diamond and graphite are both made of carbon atoms. *
1 point
True
False
Answer/Explanation:
#1 - A pure substance is either an element or a compound, making it different from a mixture. A sample of matter that has specific chemical and physical properties is the only one that fits here.
#2 - A pure substance is either an element or a compound, making it different from a mixture. Water is a compound, and thus this would be true.
#3 - An atom is the smallest unit of an element that keeps the properties of that element. Just refer to its definition.
#4 - A molecule is two or more atoms held together by chemical bonds . Again, just refer to its definition.
#5 - A chemical bond is the attractive force that holds atoms together . Jus refer to its definition.
#6 - Molecules are most definitely not all the same size, especially given the huge number of them. This would be false.
#7 - A compound is a pure substance made up of two or more different types of atoms joined by chemical bonds . Just refer to its definition.
#8 - Compounds always form in a fixed ratio, so this would be false.
#9 - If by directly, the problem means with the naked eye, this would be true.
#10 - False. It's reversed.
#11 - A crystal is a substance in which the particles are arranged in an orderly, geometric, and repeating pattern . Just refer to its definition.
#12 -True; to be more specific, they are covalent network solids.
Given the equation representing a reaction: H + H --> H2, explain in terms of energy what is happening as the bond is being formed
Answer:
The formation of the bond releases energy. This is because the individual hydrogen atoms are more unstable than when they are joined together. Stability brings about the release of energy, and this would be an exothermic reaction.
The sun produces energy in its ____ through the process of nuclear ____ ?
Answer:
Power and Nuclear Fision
sandy is looking though a stanstance that that absorbs some of the light waves and others others through. what type of light transmission is sandy seeing?
A. Translucent
B. opaque
C. transparent
D. a substance with color
Answer:
A. Translucent
Explanation:
Sandy is seeing a light transmission through a translucent medium. Or we can say this is a translucent light transmission.
In a translucent light transmission, some of the light are allowed to pass through and some are cut off. An example is frosted glass, tinted glassAn opaque object is does no allow any light to pass through. It simply does no transmit light. An example is paper, leaf and a bookA transparent transmission allows all of the light to pass through.How does heat from the sun turn liquid water into gas called water vapor?
Answer:
Explanation:Once energy is added to water by heat from the sun, the bonds between the water molecules gain kinetic energy or energy in motion. Then they escape the surface of the liquid and become a gas (water vapor), which rises into atmosphere.
What is the formula of the compound vanadium(V) oxide? Use the list of polyatomic ions and the periodic table to help you answer.
A.
VO2
B.
VO5
C.
V5O2
D.
V2O5
E.
V2O2
Answer:
d
Explanation:
Answer:
D. V2O5
Plato Userssssss
Which type of energy is always generated, at least in small amounts, when an energy transfer or transformation accounts? A. Potential energy
B.thermal energy
C. Chemical energy
D. Radiant energy
how many grams of hydrogen are required to react completely with 400g nitrogen to form ammonia? Pls help
N2+3H2-->2NH3
first we find the number of nitrogen moles
the molar mass for N2 is 14+14=28g/mole
to find the number of moles we divide the mass by the molar mass
n=400/28=14.28 moles
for 1 mole of N2 we use 3 moles of H2, therefore for 14.28 moles of N2 we use 14.28*3=42.84 moles ofH2
to find the mass of H2 we multiply the number of moles by the molar mass
the molar mass of H2 is 2g/mole
2*42.84=85.68g of H2
Why does francium react more violently than lithium?
The specific heat of iron is 0.46 J/g°C. How many joules will it take to make the temperature of a 150. g bar go up from 25°C to 60.°C?
Answer:
Q = 2.415kj
Explanation:
Q = Mc∆temperature
c = 0.46j/g°c = 0.46kj/kg°c
mass = 150g = 0.15kg
∆temperature = 60 - 25 = 35°c
Q = 0.15 X 0.46 X 35 = 2.415kj
Q = 2.415kj
Define-Ductility, malleability, sonority, electrical conductivity, thermal conductivity
A 30 kg wrecking ball was dropped from different heights.
30 kg Wrecking ball
Height dropped
Speed at impact
Energy at impact
Distance Object is moved
Trial 1
5m
9.9 m/s
1470 J
0 cm
Trial 2
7m
11.71 m/s
2058 J
3 cm
Trial 3
15m
17.15 m/s
4410 J
55 cm
Trial 4
25m
22.14 m/s
7350 J
120 cm
What is the relationship between drop height and energy at impact?
