a lab experiment shows: merge a litmus paper in a
base solution will turn it into blue.
1.a sign of physical reaction because no
changing in the structure of paper
2.a sign of chemical reaction because of
changing in color
3.no reaction occur
Answer:
2.
Explanation:
When you put the paper in a solution, it will turn blue if it is basic, or red if it is acidic. If it does not change color, it is fairly neutral.
element x bonds with phosphate in a ratio of 3 ions of element x to 2 phosphate ions. what kind of ion does element x form?
Answer:
The kind of ion is X2+ ( where the ion is formed as a result of the loss of two valence electrons)
Explanation:
The ratio of ions of the element X to the phosphate ions is 3 to 2
So what we have as formula of these will be;
X3(PO4)2
Generally we have the phosphate ion formula as; PO4^3-
So for this formula above to be possible then the element x will have a formula of its ion X2+
How do electrons differ from both protons and neutrons?
Answer:
Electrons occupy the regions around the nucleus(energy levels) while protons and neutrons are found in the nucleus
I need help really bad.
An orange is weighed and its mass is 200 grams.
Then, the peeling is removed, and both the peeling and orange are weighed. What is the total mass of the orange and peeling after the orange has been peeled?
Answer:
200 grams
Explanation:
If the exact same amount is placed on the scale the weight won't change due to the law of conservation of matter.
After the orange has been peeled, the total mass of the orange and peeling will still be 200 grams.
Mass is a physical property of matter which measures the amount of substance in an object. It is measured in grams (g) or kilograms (kg).
According to the law of conservation of mass, when the orange is weighed with the peeling on, the mass of the peeling is included in the measurement.
However, when the orange is peeled, and both the peeling and orange are weighed the mass of the orange and peeling will remain same as 200 grams.
Therefore, the total mass of the orange and peeling after the orange has been peeled is 200 grams.
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what is an example of natural material for fabric?
6. Write the full symbol for an atom with 1 proton, 2 neutrons, and 0 electrons.
Answer:
The element hydrogen has the simplest atoms, each with just one proton and one electron. The proton forms the nucleus, while the electron orbits around it.
Explanation:
Which best explains why aluminum is a nonrenewable resource?
A)It cannot be quickly replaced.
B)It is expensive to process.
C)It conducts electricity.
D)It is useful to humans.
Answer:
A.) It cannot be quickly replaced.
Explanation:
Aluminum is extremely useful to humans but is semi-difficult to produce. Because of this, your answer will be numero uno. (Or A.)
What can you say about an atom with 4 protons, 2 neutrons, and 5 electrons?
Explanation:
This is a neutral beryllium atom
A balloon filled with helium occupies 21.0ft³ at 55.0°F. Find the temperature of the helium if the volume of the balloon decreases to 11.0ft³. (Assume that the pressure is held constant.)
Answer:
Assuming pressure is held constant,the question reduces to a ratio and proportion type of question where;
At constant pressure,
21.0ft³-55.0°F
11.0fy³=11.0ft³/21.0ft³×55°F
The temperature is 28.809°F≈29°F
29°F is the temperature of the helium if the volume of the balloon decreases to 11.0ft³.
What is temperature?Temperature expresses hotness and coldness or a measure of the average kinetic energy of the atoms or molecules in the system.
Assuming pressure is held constant, the question reduces to a ratio and proportion type of question where;
At constant pressure,
21.0ft³- 55.0°F
11.0fy³ = 11.0ft³ ÷ 21.0ft³ × 55°F
The temperature is 28.809°F ≈ 29°F
Hence, 29°F is the temperature of the helium if the volume of the balloon decreases to 11.0ft³.
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help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
plzzzzzzzz
Answer
ice wedging .................
Answer:
ice wedging
Explanation:
What are the rules for naming ionic bonds?
Answer:
An ionic compound is named first by its cation and then by its anion. The cation has the same name as its element. For example, K+1 is called the potassium ion, just as K is called the potassium atom.
explain how you would obtain pure water from tap water.Your answer must include reference to the principles involved under the topic separating mixture
Answer:
Simple distillation
help me plzzzzzzzz it helps a lot
Answer:
D
Explanation:
cracks from temperature changes is a type of physical weathering often known as freezing and thawing
Someone plz answer
Positive
Proton
Electron
Ο Ο Ο Ο
Neutron
CLEAR ALL
Answer:
ummmm
Explanation:
Which of the following choices contains the most thermal energy? a penny that is 20 degrees Celsius ( oC) an atom of aluminum that is 20 degrees Celsius ( oC) a 50 milliliter (ml) glass of water at 20 degrees Celsius ( oC) a 900 milliliter (ml) pitcher of orange juice at 20 degrees Celsius ( oC)
Answer: a 900 milliliter (ml) pitcher of orange juice at 20 degrees Celsius ( oC)
Explanation:
Thermal energy is the energy possessed by an object by virtue of its temperature. The hotter the substance, the more its molecules vibrate, and therefore the higher its thermal energy.
Thermal energy refers to the sum of kinetic, potential, vibrational ,electronic and rotational energies of the object.
For bodies at same temperature, the body with more molecules will have more thermal energy due to more collisions.
calculate the ph of a solution whose(oh^-) is 4.583*10^-5 mole dm cube (pkw=14)
pH of solution = 9.661
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
pOH=-log[OH⁻]
[tex]\tt pOH=-log[4.583\times 10^{-5}]\\\\pOH=5-log~4.583=4.339[/tex]
pH+pOH=pKw
[tex]\tt pH=14-4.339\\\\pH=9.661[/tex]
what can a food scientists take advantage of with the background of chemistry?
Food scientists work with the chemistry of ingredients in food to improve the quality and stability of the food. They study the use of chemical flavors, thickening agents, stabilizers and preservatives and apply their knowledge to improve existing food products and develop new ones.
GUYS IF YOU GET THE THING ABOUT THE CHILD PERV I WOULD WATCH OUT BUT SOME OF THEM ARE JUST DOING IT TO GET FREE POINTS SO REPORT THEM!! :)
Pls brainliest! :)
What evidence for the transformation of energy does the running fan produce? Select all that apply.
The blades of the fan are spinning.
Light is produced.
An air flow is felt.
Sparks can be seen.
The fan warms up.
Answer:
The blades of the fan are spinning
An air flow is felt
The fan warms up
Explanation:
I've never seen sparks on a fan and there is no light produced. Don't over think the question.
1875
1900
1925
1869 Friedrich Mlescher
Identifies a substance that
will later be known as DNA.
1919 Phoebus Levene publishes a paper on nucleic
acids. His research helps scientists determine that
DNA is made up of sugars, phosphate groups, and four
nitrogen-containing bases: adenine, thymine, guanine,
and cytosine. Bases are often referred to by their first
letter: A, T, C, or G. Each base has a different shape.
6 Analyze In this model, what do P, S, and A bases
represent?
S
A
base
Wedwo dostigny LION CHO
148 Unit 2 Reproduction and Heredity
Answer:
In 1869, Friedrich Miescher isolated "nuclein," DNA with associated proteins, from cell nuclei. He was the first to identify DNA as a distinct molecule. Phoebus Levene was an organic chemist in the early 1900's. He is perhaps best known for his incorrect tetranucleotide hypothesis of DNA.
Explanation:
Phoebus Aaron Theodor Levene was born in Sagor in Russia. He grew up in St. Petersburg and studied medicine at the Imperial Military Medical Academy. As a student he worked in the laboratory of his organic chemistry professor where he likely developed an interest in biochemistry.
In 1891, because of growing anti-Semitism in Russia, Levene and his family emigrated to the U.S. They arrived on the symbolic day of July 4. Levene went back to Russia almost immediately to finish his medical degree, but by 1892, he was in New York and practicing medicine on the Lower East Side.
Levene did not give up research. He enrolled as a special student at Columbia University and he split his time between his medical practice and research in the department of physiology. By 1894, he began publishing papers on the chemical structure of sugars. Two years later, Levene received his first appointment as an Associate in the Pathological Institute of the New York State Hospitals. Unfortunately, around this time, Levene contracted tuberculosis and was forced to take time off to recuperate.
Levene used the time between 1896 and 1905 to regain his health and to work with a number of well-known chemists, including Albrecht Kossel and Emil Fischer, the nucleic acid and protein experts of the time. In 1905, Levene was hired by the newly established Rockefeller Institute of Medical Research to head the biochemical laboratory. Levene did most of his nucleic acid work at the Rockefeller and stayed there until his death.
Levene was a cultured man, an art lover and a collector. The walls of his house were lined with either prints and paintings or overflowing bookshelves. Levene was extremely well-read and was fluent in Russian, English, French and German. He also spoke passable Spanish and Italian. His experience, knowledge and his generosity made him a favorite with colleagues and friends. He was also said to be a great teacher, enthusiastic and supportive.
Although mostly remembered now for his incorrect tetranucleotide theory of DNA, Levene published over 700 original papers and articles on the chemical structures of many biochemicals. Levene died in 1940, before the true significance of DNA became clear.
Explanation:
6.Ocean water contains a mixture of salt & woter. It would be classified as?
Answer:
im pretty sure its: homogeneous mixture
Explanation:
the relation between stability and solubility
Answer:
2
Nobody is able to foresee the solubility of a product. There are some experimental rules, but they all have exceptions, that nobody is able to explain.
Just have a look on the Calcium salts made with the halogens (F, Cl, Br, I). There is a nice analogy among Cl, Br and I, but not F. Look ! The Calcium chloride CaCl2, bromide CaBr2 and iodide CaI2 are all extremely soluble in water. They are all soluble in less than their weight of water. But calcium fluoride CaF2 is among the least soluble product on Earth. The principal mineral for Fluoride is CaF2, and it can be found everywhere at the surface of the Earth. If this mineral would have been at least a little soluble in water, the rains would have washed away this mineral in the geological times. Why is there such a huge difference between calcium fluoride and the other halogenides ? Nobody knows !
Another example. Potassium perchlorate is the only potassium salt which is very weakly soluble in water. By comparison, Sodium perchlorate is extremely soluble in water. Why? Another example: the number of Silver compounds which are soluble in water is limited. In organic solvents, it is even worse. But the Handbook of Chemistry and Physics says that Silver perchlorate is soluble in toluene. Why? Nobody knows.
From time to time there are articles published in journals like the Journal of Chemical Education. The author is proud of displaying a theory filled with new parameters, for explaining the solubility of quite a lot of chemicals. But there are always exceptions, that he regrets not to be able to explain.
below shows Eddie fishing.
Using the picture, which of the following is the best example of mechanical energy?
Group of answer choices
the pole, line, and hook used for fishing
Eddie reeling in a fish that he has caught
Eddie standing on the side of the river
the Sun shining and warming the water
Answer:
B is correct
Explanation:
pls Brainliest
Answer:
Eddie reeling in a fish that he has caught
Explanation:
Write the chemical name for MnS2?
Answer:
Manganese(II) sulfide
Explanation:
is a chemical compound of manganese and sulfur. It occurs in nature as the mineral alabandite (isometric), rambergite (hexagonal), and recently found browneite (isometric, with sphalerite-type structure, extremely rare, known only from a meteorite).
The chemical name for MnS₂ is manganese sulfide.
Ionic compounds are formed when ions with opposing negative and positive charges form ionic bonds and form compounds, which are compounds made of ions.
Ionic compounds are named by stating the cation first, followed by the anion. When a neutral atom loses one or more electrons, it acquires a positive charge and is called a cation and when an atom gains one or more electrons, it becomes an anion and acquires a negative charge.
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Which topic would an astronomer most likely study?
the effect of water pollution on a local river
structures that can withstand earthquake damage
a movement of a population of dolphins
the formation and evolution of stars and galaxies
Answer:
the formation and evolution of stars and galaxies
Explanation:
One of the topic an astronomer will most likely study is the formation and evolution of stars and galaxies.
Astronomers are scientists that studies the universe, its components and how it works.
An environmental scientist is concerned with pollution on a local river. A civil engineer is specializes in designing structures that can withstand earthquake damage. A biologist will observe the movement of dolphins.A 17.4 L sample of oxygen gas (O2) was collected at a temperature of 23.0°C and a pressure of 2.18 atmospheres. What volume would the gas occupy at STP?
The volume of the gas at STP = 35.01 L
Further explanationConditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure).
In general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
V=17.4 L
T = 23 + 273 = 296 K
P = 2.18 atm
[tex]\tt mol=n=\dfrac{PV}{RT}\\\\n=\dfrac{2.18\times 17.4}{0.082\times 296}\\\\n=1.563[/tex]
The volume of the gas occupy at STP :
[tex]\tt 1.563\times 22.4=35.01~L[/tex]
How many moles of gas occupy 98 l at a pressure of 2.8 atmosphere and a temperature of 292
Answer:
n = 11.45 mol
Explanation:
Given data:
Number of moles = ?
Volume of gas = 98 L
Pressure = 2.8 atm
temperature = 292 K
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
2.8 atm × 98 L = n × 0.0821 atm.L/ mol.K × 292 K
274.4 atm.L = n × 23.97atm.L/ mol
n = 274.4 atm.L /23.97atm.L/ mol
n = 11.45 mol
1. What part of the human body has the same role as the power source in a computer?
2.What part of the human body has the same role as the keyboard or the mouse on a computer?
Answer:
The heart
Hand
Explanation:
The part of the human body that has the same role as the power source in a computer is the heart. A power source in a computer provides energy that powers the whole system.
The human heart provides the pumping action for the circulatory system. Just like current passes through wires in a computer by energy from the power source, the human heart pumps blood throughout the body in a like manner. Without the pumping action of the heart, the human body is dead.Also, keyboard and mouse are input devices. They are used to give instruction and perform certain tasks on the computer system.
The human body can also carryout tasks by using the hand. Objects are moved from one place to another just as you drag an icon using the mouse. We type word processors using information from the keyboard, also, we are able write using pen on paper.In your own words, please explain how to name acids.
Answer:
Acids are named based on their anion — the ion attached to the hydrogen. In simple binary acids, one ion is attached to hydrogen. Names for such acids consist of the prefix “hydro-“, the first syllable of the anion, and the suffix “-ic”. Complex acid compounds have oxygen in them.
what are the locations & charges of the 3 subatomic particles?
Answer:
protons, neutrons, electrons
Explanation:
the three main subatomic particles that form an atom protons,neutrons and electrons. the center of the atom is called the nucleus.
Answer:
[tex]{\boxed {\sf Protons: +1, Nucleus}}[/tex]
[tex]\boxed {\sf Neutrons: 0, Nucleus}}[/tex]
[tex]\boxed {\sf Electrons: -1, Surrounding \ the \ Nucleus}}[/tex]
Explanation:
There are 3 subatomic particles: protons, neutrons, and electrons.
Protons
Charge
Positive +1Location
In the nucleus (dense center of the atom)Neutrons
Charge
No charge 0Location
In the nucleusElectrons
Charge
Negative -1Location
Surrounding the nucleus