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
If you burn a piece of wood, it becomes a different substance. What type of
property is this?
A. Electrical property
O
B. Chemical property
C. Physical property
D. Mechanical property
Answer:
B. Chemical property
Explanation:
Answer:
B
Explanation:
a reaction has taken place in which you can't get back what you started with
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:
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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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
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.
Convert 1200 grams to kilograms.
From observing the plant and animal cell diagrams above, which cell seemed to have more of a regular structure?
Answer:
the green one
Explanation:
What is the net charge of a nitrogen atom with 8 electrons
Answer:
– 1
Explanation:
From the question given above, we obtained the following:
Electron = 8
Net charge of nitrogen =.?
Nitrogen has atomic number of 7. This also means that nitrogen has 7 proton because atomic number of an element is the equal to number of protons in the atom of the element.
Thus, we can obtain the net charge of nitrogen with 8 electrons by calculating the difference between the protons and electrons of the nitrogen atom. This can be obtained as follow:
Proton = 7
Electron = 8
Net charge = Proton – Electron
Net charge = 7 – 8
Net charge = – 1
Therefore, the net charge of the nitrogen atom with 8 electrons is – 1
A proton and a neutron are each close to a positive nucleus.
How does the charge on the nucleus affect the proton and the neutron, if at all?
A The neutron is attracted; the proton is repelled.
B The neutron is not affected; the proton is repelled.
C The proton is attracted; the neutron is repelled.
D The proton is not
Answer : The same charges will repel, since all protons are positively charged they will all repel so protons will repel. Neutrons don’t carry a charge so they can’t be repelled
So the answer is B: the neutron is not affected; the proton is repelled
Answer:
B
because the proton is positively charged and like charges repel, the neutron doesn't have a charge so nothing happens to it
Wait you wrote the answer in the question??
The way charge on the nucleus affect the proton and the neutron, if at all is the neutron is not affected; the proton is repelled.
What is electric charge?Electric charge refer to the physical property of a particle which direct or influence how it react to electric or magnetic force acting on it.
Therefore, The way charge on the nucleus affect the proton and the neutron, if at all is the neutron is not affected; the proton is repelled.
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Describe how molecular motion and distance between molecules change as ice is heated to become a liquid and then a gas
Answer:
Described in the explanation section
Explanation:
Ice is the solid phase of water and this phase, the water molecules usually have very little energy and therefore can't detach from each other. This is because the water molecules are closely packed together in a regular arrangement normally called lattice.
Now, when the ice is heated to become a liquid, the energy of the water molecules increases and thus some of them will have enough energy to overcome the intermolecular forces that had been keeping them closely packed in the ice phase. This will then make the water molecules to move further apart thereby forming liquid water.
Now, when the molecules are heated further, the liquid water will now turn into water vapor, which is the gas phase of water. The molecules in this gas phase will have more energy than in the liquid phase because the average distances between each of them will be much larger than the size of the molecules themselves.
I need help with this question. Will give 5 stars
Answer:
yes
Explanation:
which statement correctly describes a characteristic that a scientific measuring toll should have?
Answer:
Explanation:
To be accurate, it must be able to make measurements that are close to the actual value.
Answer:
Answer: To be accurate, it must be able to make measurements that are close to the actual value.
Explanation:
How many significant figures are in the following number?
5.67 x 106
3
6
4
is carbon dioxide gas an element or a compound
Answer:
Carbon Dioxide gas is a compound.
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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.
IamSugarBee
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
Why are scientific models important in the study of science?
Answer:
In science, amodel is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Models are central to what scientists do, both in their research as well as when communicating their explanations.
Explanation:
Answer:
They always involve critical mathematical calculations.
Explanation:
tell me if im wrong but this one makes the most since to me
How many protons in an atom of beryllium
Answer: 4
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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...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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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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ii What is the state of matter just before a substance melts?
Explanation:
Before melting,Substance are in Solid state.
In cooking or preparing food and drink, when have you observed solubility in action?
Answer:
Making lemonade with powder: The flavored powder is soluble and will dissolve into the water.
Explanation:
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 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.
The subatomic particle that has a mass equal to the neutron but carries a positive charge is the:
1. Nucleus 2. Electron 3. Proton 4. Neutron
o1 o4 o2 o3
Answer: PROTON
Explanation:
a stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10 −27 kg, which is 1,836 times the mass of an electron. Protons, together with electrically neutral particles called neutrons, make up all atomic nuclei except for the hydrogen nucleus (which consists of a single proton).
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.
6) A giraffe walked 1 mile in 15 minutes. Find the unit rate. O A. 1 mi/15 min O B. 15 mi/min O C. 0.06 milmin 0 D. 2 mi/30 min
Answer:
1 mil/ 15 min
A giraffe walked 1 mile in 15 minutes. So the unit rate for it will be 1mil/ min.
What is the unit?
Unit is some standards to measure the physical quantity of an object. There are two unit systems as SI unit and the CGS unit.
There are standard six quantities which have units :
Kilogram is the unit of mass.second is the unit of time.Meter is a unit of length.Ampere is the unit of current.Kelvin is the unit of temperature.Mole is the unit of the amount of substance.Apart from this, some quantities have derived units. These quantities are force, energy, and power.
In the given question, the giraffe walked 1 mile in 15 minutes, therefore
Walking distance of giraffe= 1mile/ 15 min.
Therefore, A giraffe walked 1 mile in 15 minutes. So the unit rate for it will be 1mil/ min.
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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:
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