Answer:
Niels Bohr
Explanation:
Janna, a student of a chemistry class, told her friend that she learnt in class that bottled water is not pure. Kim, her best friend, refused to believe Janna, referring to phrases on the label of the bottle such as “purified drinking water”, “from the purest springs”.
Plan and design an experiment to prove or disprove Janna’s claim
Form an Hypothesis?
A hypothesis that could prove or disprove Janna’s claim is; bottle water is pure water hence it boils at 100°C.
Pure water is water that contains only hydrogen and oxygen and nothing else. Impure water contains other substances apart from hydrogen and oxygen in a ratio of 2:1.
The hypothesis of our experiment is that;" bottle water is pure water hence it boils at 100°C." A hypothesis is a tentative explanation for an observation.
We can carry out the experiment by bringing about three samples of the bottled water and insert a thermometer in each of the samples then record the initial temperature of the water. The samples are then heated to boiling point and the boiling point of each sample is recorded.
If the sample boil at exactly 100°C then the hypothesis is proven or vice versa.
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Temperature Conversions
Use the formulas below to convert the temperature in each problem. Show your work.
Formulas: C -0.56(F-32) F = 1.8C+32 K-C + 273
C-K-273
41. Convert 22 °C to 'F.
42. Convert 22 °C to K.
43. Convert 30 °F to °C.
44. Convert 300 K to °C.
how might you separate a mixture of water and salt?
Answer:
by evaporating the solution leaving the solute (salt) behind after the solvent has evaporated
- ¿Qué otros materiales de tu entorno podrías utilizar que te permita mejorar tu filtrador de agua?
Suelo, grava, bolas de algodón, material de desecho, carbón, arena y astillas de madera.
El suelo, la grava, las bolas de algodón, los desechos, el carbón, la arena y las astillas de madera son materiales extraídos del medio ambiente que nos permiten mejorar la filtración del agua porque estos materiales filtran partículas y otras impurezas del agua y la hacen potable.
La arena y la grava se consideran buenos filtros de agua porque forman capas permeables que filtran el agua. El agua puede pasar lentamente a través de estas capas permeables y la mayoría de las partículas de suciedad quedan atrapadas, por lo que podemos concluir que los materiales anteriores se pueden utilizar como filtros de agua.
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(1) __________ are separated without any chemical reactions. There are many
different kinds of mixtures. Different mixtures are separated in (2)__________ ways.
Physical (3)__________ separates the components of varying sizes using a
spoon or any scooping material or by picking. The use of (4)__________ can be done
to separate the metallic materials from nonmetallic materials. (5)__________ is the
separation of an insoluble solid from a liquid mixture using a semipermeable
membrane like filter paper.
In decantation, the large particles of insoluble solid are separated from the
(6)__________ mixture. (7)__________ separates the soluble solid from the liquid
component of the solution by evaporating the liquid substance.
choices
magnet
mixtures
filtration
different
manipulation
evaporation
liquid
Answer:
1. Mixtures
2. Different
3. Manipulations
4. Magnet
5. Filtration
6. Liquid
7. Evaporation
PLEASE HELPP!!
True or False: Non-metal is a kind of metal.
Answer:
Explanation:
FALSE.
I hope this helps <333
:3
Carbon burns with oxygen to produce carbon dioxide gas.
Which of these shows the correct chemical reaction?
O C+0=CO2
O CO, CO2
C +02 + CO2
CO2 = C+0
Answer:
it will help you , but I am not sure it is correct
50. Arrange the following pairs from strongest to weakest
attraction:
a. polar molecule and polar molecule
b. nonpolar molecule and nonpolar molecule
C. polar molecule and ion
d. ion and ion
Arranging the pairs from strongest to weakest attraction :
Nonpolar molecule and Nonpolar molecule ( B )Polar molecule and Polar molecule ( A )Polar molecule and Ion ( C )Ion and Ion ( D )Covalent bonds are the strongest bonds because it involves the sharing of electrons between two binding atoms therefore the atoms are not dissociated easily. Also covalent bonds are divided into ;
Polar covalent bonds ; The shared electrons from each atom involved are unequal therefore it is easier to dissociate polar molecule bonds ( i.e. weaker bond ). Non Polar covalent bonds ; The shared electrons from each atoms are equally therefore it is harder to dissociate nonpolar molecule bonds ( i.e. stronger bond when compared to polar bonds ).While Ionic bonds involves the transfer of electrons from a donor atom to another atom and such bonds are easily broken and it is a weaker bond when compared to Polar and Nonpolar bonds. therefore polar molecule and ion bond pair is stronger than ion and ion pair.
Hence we can conclude that ranking the pairs from strongest to weakest attraction is as follows; Nonpolar molecule and Nonpolar molecule, Polar molecule and Polar molecule, Polar molecule and Ion, Ion and Ion.
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Which subtance are acidic?
Please click above answer.
what happens to the pressure of a gas if its volume is reduced?
Answer:
When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume. This is shown by the following equation - which is often called Boyle's law. ... It means that for a gas at a constant temperature, pressure × volume is also constant.
Explanation:
may i have the brainlyest
Answer:
When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume. ... It means that for a gas at a constant temperature, pressure × volume is also constant.
Explanation:
The photoelectron spectrum for the element nitrogen is represented above. Which of the following best explains how the spectrum is consistent with the electron shell model of the ato
f the atom?
A. The leftmost peak represents the valence electrons.
B. The two peaks at the right represent a total of three electrons.
C. The electrons in the ls sublevel have the smallest binding energy
D. The electrons in the 2p sublevel have the smallest binding energy
Answer:
D. Is the correct option.
Explanation:
2p level contains the electrons furthest from the nucleus in the case of Nitrogen thus it's much easier to disperse/remove the electrons from the shell due to low pull of nucleus energy.
The best explanation of how the spectrum is consistent with the electron shell model of the atom is the electrons in the 2p sub level have the smallest binding energy. Thus, option D is correct.
What is photoelectron spectrum?
Photoemission spectroscopy also known as photoelectron spectroscopy which photoelectric effect is the process in which electron are get energy from external source of energy like sunlight deals with energy measurement of energy emission or electrons emitted from solids, gases or liquids by the process of photoelectric effect,
Photoelectric effect is the process in which electron are get energy from external source of energy like sunlight and get excited and comes in excited state from the ground state due to this process continuos flow of electron is take place and after that flow of energy is takes place.
Therefore,The best explanation of how the spectrum is consistent with the electron shell model of the atom is the electrons in the 2p sub level have the smallest binding energy. Thus, option D is correct.
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what is the process that causes the seafloor to rise during a subduction zone earthquake?
Answer:Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection. ... The less-dense material rises, often forming a mountain or elevated area of the seafloor.
Explanation:
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What’s the elements found in these formulas?
NaC2HO4
H2F5BLi
2He2PSO4
3He2O4PH
Answer:
The only one I know is NaC2HO4.
There is Sodium, Carbon, Hydrogen and Oxygen.
1 atom in sodium, 2 atoms in carbon, 1 atom in hydrogen and 4 atoms in oxygen completeting the total of 8 atoms in this element.
The elements are the simplest chemical forms and they cannot be broken down through chemical reactions. There are many elements in the given formulas.
What are elements?The elements are defined as those substances whose atoms all have the same number of protons. The elements are considered as the building blocks of matter. Each element has an atomic number and a symbol.
Each atom is regarded as an element. The elements create bonds to form molecules. The isotopes are the elements with the same atomic number but different mass numbers.
NaC₂HO₄ - 'N' , 'C', 'H','O'
H₂F₅BLi - 'H','F','B','Li'
He₂PSO₄ - 'He', 'P','S','O'
He₂O₄PH - 'He', 'O','P','H'
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explain why the yield of grain increases when nitrate-containing fertiliser is added.
Explanation:
Nitrogen is an essential element for plant growth and development; however, due to environmental pollution, high nitrate concentrations accumulate in the edible parts of these leafy vegetables, particularly if excessive nitrogen fertilizer has been applied. Consuming these crops can harm human health; thus, developing a suitable strategy for the agricultural application of nitrogen fertilizer is important. Organic, inorganic, and liquid fertilizers were utilized in this study to investigate their effect on nitrate concentrations and lettuce growth. The results of this pot experiment show that the total nitrogen concentration in soil and the nitrate concentration in lettuce increased as the amount of nitrogen fertilizer increased. If the recommended amount of inorganic fertilizer (200 kg·N·ha−1) is used as a standard of comparison, lettuce augmented with organic fertilizers (200 kg·N·ha−1) have significantly longer and wider leaves, higher shoot, and lower concentrations of nitrate.
Nitrogen is a critical element for plant growth and development; however, due to environmental pollution, high nitrate concentrations get in the edible regions of these leafy vegetables, particularly if excessive nitrogen fertilizer has been involved.
What are nitrate-containing fertilizer?The main nitrate fertilizers exist as ammonium, sodium, potassium, and calcium salts. Nitrate exists highly reachable and can efficiently travel with water from the soil if there stands excessive rainfall and can get groundwater.
Nitrates in the soil exist as a primary source of nitrogen which is important for plant growth. Under normal conditions, nitrates are transformed to protein in the plant at about identical rates as they exist absorbed into the root system.
Nitrogen is a critical element for plant growth and development; however, due to environmental pollution, high nitrate concentrations get in the edible regions of these leafy vegetables, particularly if excessive nitrogen fertilizer has been involved. Consuming these crops can damage human health; thus, developing a suitable method for the agricultural application of nitrogen fertilizer exists important. Organic, inorganic, and liquid fertilizers existed utilized in this analysis to investigate their impact on nitrate concentrations and lettuce growth. The results of this pot experiment demonstrate that the total nitrogen concentration in soil and the nitrate concentration in lettuce grew as the amount of nitrogen fertilizer increased.
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based on the dosages a patient receives what level of precision should a syringe have to ensure that the patient receives the proper dosage
Answer:
No.
Explanation:
The person giving the dosage should make sure there is a proper dosage. The syringe only tells you how much there is in the syringe.
an item composed of at least 3 identifiable different compounds
Explain the relationship between primary, secondary, tertiary consumers, and decomposers
Answer:
The organisms that consume the primary producers are herbivores: the primary consumers. Secondary consumers are usually carnivores that eat the primary consumers. Tertiary consumers are carnivores that eat other carnivores.
If a cell has 4 chromosomes at the beginning of meiosis, how many chromosomes will be in each cell at the end of meiosis?
Answer:2. Mitosis would produce identical daughter cells with the same number as the parent cell. Meiosis would product sex cells with one-half the amount of genetic material as the parent cells.
Explanation:
If a cell has 4 chromosomes at the beginning of meiosis then the daughter cell will have TWO chromosomes at the end of meiosis.
Meiosis is a type of reductional cell division by which a parental cell duplicates its genetic material (DNA) and then divides twice to produce four (4) daughter cells having half of the genetic material.These successive cell division cycles are known as Meiosis I and Meiosis II.Meiosis is a sexual mode of reproduction that produces gametes or geminal cells, which fuse during the process of fertilization to form a zygote.
In conclusion, if a cell has 4 chromosomes at the beginning of meiosis then the daughter cell will have TWO chromosomes at the end of meiosis.
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List some things that help with heat generation. What do you use everyday that helps with heat generation?
Answer: A toaster
Explanation: A toaster is an house held item that is used for heating and toasting bread and other stuff.
Why are alloys generally used to make everyday objects?
Answer:
Alloys are often stronger and less active than pure metals. Alloys have higher melting point than pure metals.
chemical equation why calcium oxide is a basic
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Lab: Kinetic Energy
I NEED TWO PARAGRAPHS ABOUT THE LAB AND ABOUT KINETIC ENERGY
Answer:
In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.
In classical mechanics, the kinetic energy of a non-rotating object of mass m traveling at a speed v is 1/2*mv^2. In relativistic mechanics, this is a good approximation only when v is much less than the speed of light.
The standard unit of kinetic energy is the joule, while the English unit of kinetic energy is the foot-pound.
Explanation:
Don't directly copy and paste this because you will get flagged for plagiarism. Just type this out in your own words and change a few of the words to their synonyms.
the only report that will fool the teachers
Why can some mixtures not be classified as solutions?
A. Not all mixtures have solutes
B. Not all mixtures are heterogeneous
C. Mixtures are made of only one substance
D. Not all mixtures are homogenous
Answer:
not all mixture have solutes
what molecule would be most directly affected if 2 co2 molecules could be fixed at the same time?
Fe+H2SO4------>????????????
equation: Iron + Sulfuric acid → Iron (II) sulfate + hydrogen gas
Type of Chemical Reaction: For this reaction we have a single displacement reaction.
Note that this is the chemical reaction that takes place when diluted Sulfuric acid reacts with iron. If you have concentrated Sulfuric acid you will have a different equation.
12. What is the mass of 5.00 moles of F^2 O^3?
Answer:
798.5 grams
Explanation:
as you move to the right across the periodic table, beginning with group 16, non-metals…
a) lose more electrons
b) gain or share fewer electrons
c) gain or share more electrons
what is the difference between essential and nonessential amino acids
Answer:
Simply put, essential amino acids are amino acids that cannot be made by the body. These amino acids must come from a person's diet, as the human body lacks the metabolic pathways required to synthesize these amino acids. ... Nonessential amino acids do not need to come from the diet.
Explanation:
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When a strontium compound is heated in a flame, red light is produced. When a barium
compound is heated in a flame, yellow-green
light is produced. Explain why these colors are
emitted.
What is the health danger of breathing carbon monoxide
Answer:
Well, it´s dangerous because it displaces oxygen in the blood and deprives the heart, the brain and other vital organs.
Explanation:
What i mean by that is that breathing carbon monoxide reduces the amount of oxygen that can be transported in the blood stream to critical organs like the heart and brain. It can also causes E.g. dizziness, confusion, unconsciousness and even death.
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