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Density is an intensive physical property because the density of a given substance does not change with the size of the sample. (2 points)
True
False
Answer:
True
Density = mass/volume
Suppose that a block has a mass of 20 g and a volume of 20 cm^3.
Density = 20 g/20 cm^3 = 1 g/cm^3
Now, you cut the block in half. The half-block has a mass of 10 g and a volume of 10 cm^3.
The density of the half-block is
Density = 10 g/10 cm^3 = 1 g/cm^3
The density stays the same, even though the size of the sample has changed.
Explanation:
Answer:
✅True
Explanation:
Density is an intensive physical property because the density of a given substance does not change with the size of the sample.
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How to calculate the amount of water needed to dilute a solution?
Answer:
Suppose you must prepare 400 ml of a disinfectant that requires 1:8 dilution from a concentrated stock solution with water. Divide the volume needed by the dilution factor (400 ml / 8 = 50 ml) to determine the unit volume. The dilution is then done as 50 ml concentrated disinfectant + 350 ml
A vial is filled with room temperature water, and blue cold water has been placed at the bottom. A warm water bag sits next to the vial. What do you think will happen?
Explanation:
In the context, a vial which is used in store medical samples is filled with water at room temperature. And the vial is kept on a cold water. Also a water bag containing warm water is kept near the vial.
The cold water kept at the bottom of the vial is having lower kinetic energy while warm water will have higher kinetic energy than the others. Since the water in the vial is at room temperature and it is in touch with the cold blue water, the water in the vial will loose or give its temperature to the cold blue water through conduction as well as convection process since temperature always flows from a hot body towards the cold body.
On the other hand, the warm water placed next tot he vial will give its temperature to the atmosphere.
A chemist is testing the quality of a wine produced by a vineyard. Which branch of chemistry might the chemist use? physical chemistry analytical chemistry inorganic chemistry organic chemistry
Answer:
organic chemistry
Explanation:
There are many branches of chemistry. Some of them are physical chemistry, analytical chemistry, inorganic chemistry and organic chemistry.
A chemist is testing the quality of a wine produced by a vineyard. It means he will test the structure, properties, and preparation of wine. All these tests comes under organic chemistry.
Hence, the correct option is (d) "organic chemistry"
Answer:
analytical chemistry
Explanation:
I took the test
plz answer soon need answer
when talking about sodium carbonate reaction as the amount of surface area increases what happens to the rate of this reaction????
rate is faster
rate is slower
rate stays same
Answer:
rate is faster
Explanation:
the rate of reaction increases.
Answer:
The rate is faster
Explanation:
just did it on edg :)
Find the probability that 200 tosses of a coin will result in (a) between 80 and 120 heads inclusive, (b) less than 90 heads,(c)less than 95 heADS (D) EXACTLY 100 heads
Answer:
between 80 to 120
Explanation:
because it would be around 100 but it can't be exact.
1. Which statement best describes why a gas is
easily compressible while most solids
are incompressible?
A. The molecules of a gas are much smaller
than those of a solid.
B. The molecules of a solid are not attracted to
one another.
C. The molecules of a gas are much further
apart than those of a solid.
D. The molecules of a solid are much larger
than those of a gas.
C) The molecules of a gas are much further
apart than those of a solid.
A gas is easily compressible while most solids are incompressible because the molecules of gas are much further apart than those of a solid.
What are gases?Gases is one of the four fundamental state of matter.
Gases can be defined as phase of matter that neither have fixed shape nor have fixed volume.
The molecules of gases are far apart from each other as compare to other phases of matter.
The change in properties of volume is known as compressibility and those fluid whose volume changes are known as compressible fluids or gases.
The fluids which does not compressed or expanded and its volume remain constant are known as incompressible fluids or gases.
Thus, gas is easily compressible while most solids are incompressible because the molecules of gas are much further apart than those of a solid.
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To separate a mixture of iron filings and salt, the most efficient method would be
Answer:
Explanation:
Of course you could do the separation chemically. Dissolve the salt up in water, pass thru a filter, wash the iron filings with ethanol, which would encourage the salt to precipitate from solution.
I do hope I helped you! :)
Answer:
by passing a magnet through the mixture
Explanation:
What is the total number of protons, neutrons, and electrons in a thallium, TI, atom that has a mass number of 204
Help
Answer:
Name, Thallium. Symbol, Tl. Atomic Number, 81. Atomic Mass, 204.3833 atomic mass units. Number of Protons, 81. Number of Neutrons, 123. Number of Electrons, 81 ... It has a metallic luster when it is first exposed to air but it tarnish quickly
Explanation:
Hope this helped :)
How many significant figures are in the following number?
5.67 x 106
3
6
4
How many protons in an atom of beryllium
Answer: 4
Hope this helps!
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This element has nine more electrons than Technetium
Answer:
Tellurium
Explanation:
Technetium's position on the periodic table is 43 and Tellurium's is 52
Convert 1200 grams to kilograms.
Which of the following are fluids
Find a recent article (no more than 3 years old) that discusses a new discovery or
technology that uses chemistry and summarise the article. Make sure that you:
a. Provide an overview of the discovery or technology
b. Describe the chemistry involved
Explain the benefits to society
C.
Date: September 11, 2020
Source: Arizona State University
Summary: Astronomers have determined that some carbon-rich exoplanets, given the right circumstances, could be made of diamonds and silica.
Explanation:As missions like NASA's Hubble Space Telescope, TESS and Kepler continue to provide insights into the properties of exoplanets (planets around other stars), scientists are increasingly able to piece together what these planets look like, what they are made of, and if they could be habitable or even inhabited.
In a new study published recently in The Planetary Science Journal, a team of researchers from Arizona State University (ASU) and the University of Chicago have determined that some carbon-rich exoplanets, given the right circumstances, could be made of diamonds and silica.
"These exoplanets are unlike anything in our solar system," says lead author Harrison Allen-Sutter of ASU's School of Earth and Space Exploration.
Diamond exoplanet formation
When stars and planets are formed, they do so from the same cloud of gas, so their bulk compositions are similar. A star with a lower carbon to oxygen ratio will have planets like Earth, comprised of silicates and oxides with a very small diamond content (Earth's diamond content is about 0.001%).
But exoplanets around stars with a higher carbon to oxygen ratio than our sun are more likely to be carbon-rich. Allen-Sutter and co-authors Emily Garhart, Kurt Leinenweber and Dan Shim of ASU, with Vitali Prakapenka and Eran Greenberg of the University of Chicago, hypothesized that these carbon-rich exoplanets could convert to diamond and silicate, if water (which is abundant in the universe) were present, creating a diamond-rich composition.
Diamond-anvils and X-raysTo test this hypothesis, the research team needed to mimic the interior of carbide exoplanets using high heat and high pressure. To do so, they used high pressure diamond-anvil cells at co-author Shim's Lab for Earth and Planetary Materials.
First, they immersed silicon carbide in water and compressed the sample between diamonds to a very high pressure. Then, to monitor the reaction between silicon carbide and water, they conducted laser heating at the Argonne National Laboratory in Illinois, taking X-ray measurements while the laser heated the sample at high pressures.
As they predicted, with high heat and pressure, the silicon carbide reacted with water and turned into diamonds and silica.
Habitability and inhabitabilitySo far, we have not found life on other planets, but the search continues. Planetary scientists and astrobiologists are using sophisticated instruments in space and on Earth to find planets with the right properties and the right location around their stars where life could exist.
For carbon-rich planets that are the focus of this study, however, they likely do not have the properties needed for life.
While Earth is geologically active (an indicator habitability), the results of this study show that carbon-rich planets are too hard to be geologically active and this lack of geologic activity may make atmospheric composition uninhabitable. Atmospheres are critical for life as it provides us with air to breathe, protection from the harsh environment of space, and even pressure to allow for liquid water.
"Regardless of habitability, this is one additional step in helping us understand and characterize our ever- increasing and improving observations of exoplanets," says Allen-Sutter. "The more we learn, the better we'll be able to interpret new data from upcoming future missions like the James Webb Space Telescope and the Nancy Grace Roman Space Telescope to understand the worlds beyond on our own solar system."
Hope this helps u...What kind of questions CANNOT be answered by chemistry?
If someone could help me out I would really appreciate it! Thank you!
Answer:
d. why matter exists
Explanation:
The kind of questions that chemistry CANNOT answer is "why matter exists".
In Chemistry, question of how the properties, composition and structure of substances are is answered. Also, the transformations that these substances undergo, and the energy that they release or absorbe during the transformation processes are revealed in chemistry.
Chemistry can answer the question of what forms of matter exists but cannot answer why matter actually exists.
why does neon have a higher first ionization energy than fluorine
The forces between water molecules are stronger than the forces between ethanol molecules. Which liquid would probably be most difficult for an insect to walk on?
What is the atomic number of an atom that has 5 neutrons and 4 electrons
The atomic number is 4.
The atomic number of the given atom is equal to 4.
What is the atomic number?The atomic number (symbol Z) of a chemical element can be defined as the charge number of an atomic nucleus. For an ordinary atom, the atomic number is equal to the number of protons found in the nucleus of an atom of that element.
The atomic number helps to uniquely identify ordinary chemical elements. In an ordinary uncharged atom or neutral atom, the atomic number of that atom is also equal to the number of electrons.
For a neutral atom, the sum of the atomic number and the neutron number gives the atomic mass. The protons and neutrons have approximately the same mass. Atoms that have the same atomic number but different numbers of neutrons or different mass numbers are known as isotopes.
Given the number of electrons in the atom is 4. Therefore, the atomic number of that atom will be equal to 4.
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An ice cream company decides to make a new lower calorie flavor,but testers reported that the flavor wasnt as good as the original.Is this an example of trade off
Answer:
Yes, the given instance is an example of a trade-off.
Explanation:
The trade-off seems to be a strategy to minimize or surrender one or more favorable results in consideration for increasing either receiving other favorable results to optimize cumulative benefit or efficacy within such conditions.The above is indeed a trade-off since the participants are experimenting in exchange again for ice cream individuals have to enjoy. The ice cream manufacturer always gets a review of the technician in exchange for free ice cream.how are protons and neutrons found?
Answer:
Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.
Explanation:
I'm not sure if this is correct but I hope this helps.
What is the temperature 51°C expressed in kelvins?
Answer:
The answer is
324 KExplanation:
To express a given temperature in degree Celsius to Kelvin simplify add 273 to the given value
That's
K = 273 + °Cwhere
K = Kelvin
°C = value in degree Celsius
From the question the value to be converted is 51°C
It's equivalent in Kelvin is
K = 273 + 51
We the final answer as
324 KHope this helps you
Carbondioxide gas is't collectable in water. why?
Answer:
carbon dioxide is a gas so it isn't collected over water.
Explanation:
it works for insoluble gases such as hydrogen,or gases that do not dissolve easily in water such as ammonia and chlorine are readily soluble in water and are not collected this way.
hope it is helpful for you.
ii What is the state of matter just before a substance melts?
Explanation:
Before melting,Substance are in Solid state.
STATE TRUE OR FALSE
a) natural gas has a characteristic odour
b) natural gas is heavier than air
c) synthetic fibres, polymers, dyes are synthesized from petrochemicals
d) we should use convential bulb's instead if LED'S
e) emission of CO2 gas during burning of fossil fuels burn global warming
Which statement explains how the bands in the crystal of a metal are like atomic orbitals?
A. They both have localized electrons that orbit specific atoms.
B. They both involve ionization of some atoms so bonding can occur.
C. They both have delocalized electrons that move from atom to atom.
D. They both allow electrons to move from lower energy levels to higher energy levels.
Answer:
D
Explanation:
Correct On EDU
Crystal lattice of metals are highly ordered in which the ions and electrons are arranged in a stoichiometric proportion. But,electrons can excite to higher energy levels as they fo in atomic state. Thus , option D is correct.
What is crystal lattice?Crystal are highly ordered structures of solids and is anisotropic in nature with a perfect geometry and crystal lattice units. There will be free electrons present in the interstices spaces and which can be delocalized throughout the lattice results in conduction.
Electrons can acquire energy to excite to the higher energy levels from the lower energy level in a crystal lattice. Electrons are revolving around the nucleus of an atom through definite circular paths of fixed energy.
Electrons in an atom tends to excite to higher energy levels and then will return to the lower energy level by emission of energy in the form of light or heat. This process make the element coloured and conducting as in the case of crystal bands in metals.
Hence, both atoms and metal lattice allow electrons to move from lower energy levels to higher energy levels and option D is correct.
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What will most likely occur if sulfur forms an ionic bond with another element? (Click on the icon for the periodic table to view sulfur)
Sulfur will accept electrons.
Sulfur will donate electrons.
Sulfur will become a positive ion.
Sulfur will become less stable.
Answer:
The answer is Sulfur will accept electrons
Explanation:
Because it will most likely occur if sulfur forms an ionic bond with the elements
If sulfur forms an ionic bond with another element then the sulfur will accept electrons. Hence option A is correct.
What is ionic bond?Due to their electrostatic attraction, oppositely charged species interact via ionic bonding, a form of chemical connection.
One atom transfers electrons to another when a positively charged ion forms a connection with a negatively charged ion.
Example: NA+ and Cl- gives NaCl
Sulfur belongs to group 6A of non-metals. Its valence electrons number six. It follows the octet rule. It must acquire two electrons. Thus, it creates two single covalent connections (ionic bonds).
When sulfur receives two electrons, it is ionized itself, so it from an ion with a 2-charge.
Sulfur will accept electrons will mostly likely occur if sulfur forms an ionic bond with another element. Hence option A is correct.
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What is coronavirus
Why do you need to be cautious
Answer:
IT IS CORONAAAAAAAAAAAAAAAAAAAAA
Answer:
coronavirus is a lung disease, it makes it so that you have a fever, cough, trouble breathing, mild headaches, and sometimes even nausea. you should be cautious because if your at high risk your gonna have trouble recovering from it. wearing a mask could help protect others from the spread of coronavirus. others wearing a mask prevents you from the spread of coronavirus. if you do catch it, make sure you see your doctor and isolate yourself for two weeks to a month and try not to go out as much.
Refer to this portion of the periodic table to answer the question that follows.
3
4
Lithium Beryllium
Li Be
6.939 9.01218
2.1 2,2
5
Boron
B
10.81
2,3
7
Nitrogen
N
14.0067
2,6
8
Oxygen
0
15.9994
2,6
9
Fluorine
F
18.9984
2,7
12.011
2,4
20.183
2,8
Which element in this group would be the least likely to react with other elements?
a
Boron
b
ОООО
Lithium
Oxygen
Neon
d
Answer:
nitrogen
Explanation:
it has 14.0067 and it helps with the reaction of the other element
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the correct option is option D.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
Noble gases are the gases that belongs to group 18 of periodic tables. These gases have the noble gas configuration. These gases are the least reactive. On applying high pressure and temperature, these gases get reactive.
Among the given option Neon Ne is the only element that is belonging to the noble gases. Neon is unreactive.
Therefore, the correct option is option D. Neon is unreactive.
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Which of these is an example of an abiotic factor?
What are the choices? I'll answer once you tell me those
Answer:
sunlight is an abiotic factor
Explanation: