Answer:
Hydrogen ion concentration is 2.773E-4Mole per DM3
Hydroxide ion concentration is 4.093E-11
It is an acid
Explanation:
PH(H3O)=-LogH3O
PH=3.557
H3O=antilog of -3.557
antilog of -3.557=antilog (0.443 -4)
antilog0.443 ×antilog -4=2.773E-4mole per DM3.
(H3O)(OH)=10^-14
H30=2.773×10^-14
OH= 1.00E-14/2.773E-4
=4.093E-11
it is an acid since the concentration of hydrogen ion is more than the hydroxide ion
Answer:
[tex]3.606\times 10^{-11} M[/tex] is the hydrogen ion concentration.
0.0002773 M is the hydroxide ion concentration.
The solution has pH value more than 7 which means that it is base.
Explanation:
The pH of the solution is defined as negative logarithm of hydrogen ions concentration in a solution. Lower the value of pH more acidic will the solution.
Mathematically written as:
[tex]pH=-\log[H^+][/tex]
The pOH of the solution is defined as negative logarithm of hydroxide ions concentration in a solution. Lower the value of pOH more alkaline will the solution.
Mathematically written as:
[tex]pOH=-\log[OH^-][/tex]
The sum of ph and pOH is equal to 14.
pH + pOH = 14
We have:
Solution with pOH = 3.557
The pH of the solution = 14 - pOH = 10.443
[tex]pH=-\log[H^+][/tex]
[tex]10.443=-\log[H^+][/tex]
[tex][H^+]=3.606\times 10^{-11} M[/tex]
[tex]3.606\times 10^{-11} M[/tex] is the hydrogen ion concentration.
[tex]pOH=-\log[OH^-][/tex]
[tex]3.557=-\log[OH^-][/tex]
[tex][OH^-]=0.0002773 M[/tex]
0.0002773 M is the hydroxide ion concentration.
The solution has pH value more than 7 which means that it is base.
What is the pressure of 0.5 mol of nitrogen gas in a 5 L container at 203 K
Answer:
1.67 atm.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = ??? atm).
V is the volume of the gas in L (V = 5.0 L).
n is the no. of moles of the gas in mol (n = 0.5 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 203 K).
∴ P = nRT/V = (0.5 mol)(0.0821 L.atm/mol.K)(203 K)/(5.0 L) = 1.67 atm.
Which of the following might a chemist choose to study?
A. Glacier movement in Alaska
B. Better ways to recycle plastics
C. The effects of hurricanes on turtle populations
D. The vibrations in bridges caused by big trucks
Answer:
C. better ways to recycle plastics
Explanation:
Answer:
B. Better ways to recycle plastics
Explanation:
Remember that chemistry studies matter and energy as well as the interactions between them. This means it studies the changes that material substances undergo, how and why substances combine or separate to form another ones. In this case the action of recycling implies a chemical change as the plastic transform not only in a physical way but in a structural one.
This is the reason a chemistry would probaly studie the most efficient way to do it, this means, the way it needs less energy to change.
Atoms of a given element will have the same mass.
A: true
b: false
False. Because atom of the equal chemical factors do no longer have identical mass due to the fact variety of protons inside the nucleus is the equal for all atoms of the same element however the neutron is not.
When atoms of the same element have different mass numbers?Isotopes of any given element all include the same range of protons, in order that they have the identical atomic number (for example, the atomic quantity of helium is constantly 2). Isotopes of a given detail include special numbers of neutrons, therefore, special isotopes have one-of-a-kind mass numbers.
All atoms of an element have an equal quantity of protons, and every element has a distinct range of protons in its atoms. As an instance, all helium atoms have two protons, and no different elements have atoms with two protons.
Atoms of a given element are equal in size, mass, and different homes. Atoms of various factors range in size, mass, and different residences. Atoms cannot be subdivided, created, or destroyed. Atoms of different elements can integrate into easy whole range ratios to form chemical substances.
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c. What are the characteristics of an old river?
Answer:
Explanation:
An old river occurs at the plain course and it is at its lower stage.
Here:
The river gradient is very gentle as it is on a plain. An old river would be at its depositional phase where all the sediments its carries are being laid down. It has a low velocity and a very sluggish flow. Lateral erosion is very active at this stage. The volume of the river increases substantially as more river tributaries joins. Some of the river features are flood plains, leeves, ox-bow lakes, delta e.tc.The part of the electromagnetic spectrum that is necessary for the sense of sight in humans is__________
1.radio waves
2.gamma rays
3.infrared light
4.ultraviolet light
5.visible light
Answer:
visible light
Explanation:
Answer:
c
Explanation:
A student squeezes several oranges to make a
glass of orange juice. The juice contains pieces of
orange pulp mixed with the juice. Explain why this
drink can be considered a combination of a
suspension and a solution.
Answer:
The juice contains sugars, plant pigments, and other chemicals dissolved in water. This is a solution.
The pieces of orange pulp will rise to the top or settle to the bottom of the juice if it is allowed to sit.
The pieces of pulp mixed with the juice form a suspension.
Explanation:
answers on edge
Why does the sun appear to be the brightest star in the sky?
A- Its apparent brightness is much greater than other stars.
B- It burns more gas, making it brighter than any other star.
C- It is the largest star in the galaxy, so it is the brightest star.
D- Its relative distance to Earth is closer than the other stars.
Answer:
D
Explanation:
There are only 2 ways to explain this.
distance
and brightness caused by what it is burning.
A is true but it is not the explanation of why it is true.
B this is actually not true. Other stars would burn much more.
C It is not the largest star. In fact it is in the lower middle.
D is the answer. 93 million miles as these things go, is not every much.
Answer:
I did this and the right answer was D
Explanation:
In which phase(s) of matter are the atoms closely packed but still able to slide past each other?
Gas
Liquid
solid and gas
Liquid and solid
Answer:
Liquid.
Explanation:
In a solid the atoms are closely packed , vibrate but remain in a fixed position. In a gas the atoms are moving fast and fill any space they are contained in.
What did Ernest Rutherford’s gold foil experiment demonstrate about atoms?
Answer:
Ernest Rutherford's gold foil experiment consisted in shooting positive particles called α particles, which are nuclei of helium atoms (2 protons and 2 neutrons), to a thin gold film.
Explanation:
Rutherford's Gold Foil Experiment proved the existance of a small massive center to atoms, which would later be known as the nucleus of an atom. Ernest Rutherford, Hans Geiger and Ernest Marsden carried out their Gold Foil Experiment to observe the effect of alpha particles on matter.
Ernest Rutherford’s gold foil experiment demonstrates that the positive charge of an atom is located in the nucleus, the small region that contributes most to the mass of the atom.
What did Ernest Rutherford’s gold foil experiment demonstrate about atoms?Rutherford proposed that the atom is mostly empty space. The electrons revolve in circular orbits about a massive positive charge at the center. His model explained why most of the α particles passed straight through the foil.The gold foil experiment by Ernest Rutherford proved that the positive charge of an atom is located in the nucleus, the small region that contributes most to the mass of the atom. Most of the atom is empty space, but the nucleus, however small, dictates the mass of the atom.To learn more about Ernest Rutherford’s gold foil experiment, refer to: https://brainly.com/question/1471810
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which of the following nuclei would be the least stable
A 2 protons, 2 neutrons
B 1 proton 1 neutron
C 1 proton 3 neutrons
D 1 proton 2 neutrons
Answer:
C. 1 proton 3 neutrons
Explanation:
A nucleus is more stable if the ratio of the neutrons to protons is between 1:1 and 1:1.5.
Thus the ratios of neutrons to protons for the nuclei are as follows
A- 1:1
B- 1:1
C- 1:3
D- 1:2
Among these ratios, C is the greatest thus the nucleus is the least stable.
The nuclei with D. 1 proton and 2 neutrons will be least stable.
Explanation:Nuclides containing odd quantities of the two protons and neutrons are the least steady and this implies increasingly radioactive.
Nuclides containing even quantities of the two protons and neutrons are most steady and this implies less radioactive.
Nuclides contain odd quantities of protons (positive charged particles) and even quantities of neutrons are less steady than nuclides which are containing even quantities of protons and odd quantities of neutrons. By and large, atomic strength is more prominent for nuclides containing even quantities of protons and neutrons or both.
When we add 1 proton with 2 neutrons we get 3 as answer, which means an odd value, thus nuclide with this proportion of proton and neutron is least stable.
how does water pollution affect climate change?
Answer:
As the climate warms, it changes the nature of global rainfall, evaporation, snow, stream flow and other factors that affect water supply and quality. Specific impacts include: Warmer water temperatures affect water quality and accelerate water pollution.
Explanation:
Answer:
if there water pollution the climate will not hange as good it will chang as bad and the animals will be affected as well.sorry if im wrong.
Which contribution added to Rutherford's discovery of a positive nucleus?
A: Electrons are scattered in an atom.
B: Neutrons are inside the nucleus of an atom.
C: Atoms of the same element have the same properties.
D: Atoms are indivisible.
Answer:
A: Electrons are scattered in an atom.
Explanation:
Ernest Rutherford performed the gold foil experiment which gave a deeper perspective into what an atom really is. In his experiment, he bombarded a thin gold foil with an alpha particle source.
From the behavior of the alpha particles that associated with the gold foil, a number of conclusions were drawn:
He suggested that an atom has a small positively charged nucleus where the bulk of the atomic mass is concentrated. Surrounding the nucleus is a large space which contains the electrons.What is atom economy?
Answer:
The conversion efficiency of a chemical process.
Explanation:
Hope this helps!
Q: If the average speed of a species of tortoise is 0.36 km/h, what is that speed in cm/s?
Answer:
36000 centimeters
Explanation:
If the average speed of a species of tortoise is 0.36 km/h, then it would be 36000 centimeters.
How is the nitrogen cycle important to humans
Answer:
Explanation:
Nitrogen cycle is one of the important biochemical cycle in nature. The element nitrogen is fixed by the soil bacteria which is available in nature in the form of atmospheric nitrogen. The atmospheric nitrogen is absorbed by the soil bacteria which converts it into forms like nitrates and nitrites which are easily absorbed by the plants. The plants use these forms for the synthesis of amino acids. These amino acids are used by the plants to synthesize their proteins.
The plants and their products are the source of proteins which are the building blocks of human body. The proteins are necessary for building up the muscle mass, renew of hair and skin, repair of injured tissues, defense against the injury, foetal development and others. Hence, nitrogen cycle is important for humans.
Answer:The nitrogen cycle, or n cycle, on Earth, is very important as it provides every living thing with what they need to grow. Humans, animals, even plants. Nitrogen is the most abundant source in the atmosphere. It is also the building block of proteins, nucleic acids like DNA, and a very important component of all life.
Explanation:
Arrange the elements TELLURIUM, RUBIDIUM, POTASSIUM & BROMINE in order of increasing second energy (IE2) and in decreasing atomic size.
Answer:
IE2: Te < Br < Rb < K
Atomic size: Rb > K > Te > Br
Explanation:
2nd Ionization energy
Ions with only one valence electron (K and Rb) should have the highest second ionization energies. Once the first electron has been removed, the next one would have to come from a filled valence shell.
Atoms lower down in the Periodic Table should have lower ionization energies, because their valence electrons are further from the nucleus and are less tightly held.
Br and Te each have a nearly complete subshell, so both electrons can come from the same level. Te is further down the Periodic Table, so Te < Br
The order of second ionization energies is Te < Br < Rb < K.
Atomic Size
Atomic size increases from right to left and from top to bottom of the Periodic Table. Thus, the biggest atoms are at the lower left and the smallest atoms are at the upper left.
Rb: Left of Row 5. ∴ Biggest atom.
Te: Right of Row 5. ∴ Rb > Te. Also, Br is in Row 4, so Te > Br
K: Left of Row 4. ∴ Rb > K
Br: Right of Row 4 ∴ K > Br
So far, we have Rb > K and K > Br, so Rb > K > Br .
We also have Rb > Te and Te > Br, but is Te > K or is K > Te?
In going from K to Te, the effect of adding 33 more protons to the nucleus outweighs the effect of adding one more shell, so K > Te.
The final order is Rb > K > Te > Br.
The mass of a proton is approximately equal to the mass of
Which of the following is a pure substance?
Air
Blood
Copper
Wood
Answer:
copper
Explanation:
its an element, its not mixed with anything else
The answer is "Copper" or option C. Air, and blood aren't pure substances but mixtures, wood is also a mixture which means the answer is copper. Pure Substances are is matter with composition and distinct chemical properties.
Hope this helps.
burning wool smells like burning hair while burning cotton smells like burning paper. why?
Burning wool smells like burning hair while burning cotton smells like burning paper due to the different chemical compositions of these materials.
When burning wool smells like burning hair while burning cotton smells like burning paper due to the different chemical compositions of these materials. Wool is primarily made of protein fibers like hair, so when it burns, it releases similar compounds leading to a similar smell. On the other hand, cotton is composed of cellulose fibers, like paper, so when it burns, it produces a smell akin to burning paper.
What contains elements with similar properties in the periodic table?
A) a column
B) a row
C) a period
A) A column contains elements with properties which are similar in periodic table.
Explanation:The vertical section (column) in the periodic table has the similar type of chemical behavior so they are also called as groups or families. The electronic configuration gives the chemical description of the compound.
The chemical compounds in these families have the number of valence electron which is same in the outer cell hence, showing the same chemical properties. Halogens and Nobel gases are the groups of periodic table.
Which description best characterizes the motion of particles in a solid?
The particles in a solid are tightly packed and locked in place. Although we cannot see it or feel it, the particles are vibrating in place.
As these molecules heat up, they will vibrate more vigorously, and will eventually turn to water, then gas.
Answer:
Hardly move and vibrate
Explanation:
in solids particles are packed thight together
Which of the following volumes is the smallest? a) one microliter b)one deciliter d)one liter c)one milliliter
Answer:
The correct answer option is a) one microliter.
Explanation:
We are given four different units of measuring the volume of a liquid and we are to determine whether which of them is the smallest of all.
Comparing the given values with 1 liter quantity:
a) 1 microliter - it equals to 0.000001 liters
b) one deciliter - it equals to 0.1 liter
c) one liter - 1 liter
d) one milliliter - it equals to 0.001 liter
So the smallest value is one microliter.
Answer:
a) one microliter
Explanation:
The advantage of the SI (International system of measurements) is that everything is in base 10, and the prefix indicates the power of 10.
For the volume, the base unit is the liter.
one microliter = 0.000001 liter (one millionth, 1 / 1000000, of a liter)
one deciliter = 0.1 liter (one tenth, 1/10, of a liter)
one liter = 1 liter
one milliliter = 0.001 liter (one thousand, 1/1000, of a liter)
As you can see, a microliter is by far the smallest of these units.
What is the relationship between events and patterns?
Answer:
events that happen over and over form a pattern
Explanation:
An event is the occurrence of something. If an event occurs over and over again following some sort of order the order is known as the pattern. The pattern is the overall structure that an event follows. Without a number of events there is not pattern. However, an event can occur without a pattern. The relationship among events is called a pattern
Hypothesis: If the temperature of the liquid is increased, then more sugar will dissolve, because warm solutions hold more solute than cold solutions.
To test the hypothesis above, you changed the (A- Sugar concentration,B- Pressure, C- Solubility, D- Temperature) of the solvent and measured the (A- Sugar concentration, B- Pressure, C- Solubility, D- Temperature) of a solid.
To test the hypothesis that increasing temperature allows more sugar to dissolve, temperature is varied and the solubility of sugar is measured. The solubility usually increases with temperature due to more energetic collisions between solvent and solute molecules. Solubility curves illustrate this relationship and show variability across different solutes.
Explanation:The hypothesis to be tested is that increasing the temperature of a liquid increases the amount of sugar that can be dissolved. To do so, you would change the Temperature (D) of the solvent and measure the Solubility (C) of a solid. The solubility of most substances, including sugar, depends strongly on temperature. As you increase the temperature, you are giving the solvent molecules more kinetic energy, which results in more collisions with the solute with greater force. This increased collision frequency and force leads to a higher rate at which the solute dissolves. When the solubility limit is reached, additional sugar will not dissolve, indicating that the solution has become saturated.
Furthermore, solubility curves can help to visualize the relationship between solubility and temperature. They show that while the solubility of most solid substances tends to increase with temperature, the magnitude of this effect can vary significantly between different solutes.
Changing the temperature of the solvent increases the solubility of sugar, allowing more sugar to dissolve in warm water. This is demonstrated through solubility curves that show higher solubility at higher temperatures.
Your hypothesis investigates the relationship between temperature and the solubility of sugar in a liquid (solvent). To test this hypothesis, you changed the temperature of the solvent and measured the solubility of the sugar. Generally, as the temperature of a solution increases, it can hold more solute, hence more sugar dissolves in warm water compared to cold water. This can be visualized using solubility curves, which show how solubility changes with temperature.
For example, when a saturated sugar solution is heated, more sugar can dissolve because warm solutions have higher solubility. This demonstrates that increasing temperature generally increases the solubility of many solid substances.
Which of the following can reorganize the atoms in rock?
high temperature
Weathering
Decomposition
Cementation
Answer:
High temperature
Explanation:
Drastic increase in temperature can cause bonds between atoms to change and reorganise. Temperature furnishes atoms the necessary energy to change position and form new bonds.
Increase in temperature coupled with increasing pressure drives metamorphic mineral changes in rocks. During metamorphic changes, new minerals froms as a result of atoms being reorganized.
Temperature simply provides kinetic energy for atoms to move and reorganize themselves.
Typical room temperature is 23°C. In a classroom at sea level, the atmospheric pressure is 1.00 atm,
Would the gas in a balloon held in this classroom be at STP?
Answer: No the given gas is not at STP.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
Standard condition of temperature (STP) is 273 K and atmospheric pressure is 1 atmosphere respectively.
Given temperature :[tex]23^C=(23+273)K=296K[/tex]
1 mole of every gas occupy volume at STP = 22.4 L
Thus at STP, the temperature is 273 K and pressure is 1 atmosphere and the given gas is not at STP.
Answer:
no
Explanation:
Part A
Look at the window on the left side of the simulation. It shows the reaction A+
BC AB + C. How does this reaction differ from the reaction by which
ammonia is synthesized?
Answer:
A + BC → AB + C "single replacement reaction" while ammonia synthesis is a "synthesis reaction".
Explanation:
A single replacement reaction, is a reaction by which one element replaces an/other element in a compound.
It can be represented generically as: A + B-C → A-C + B This will most often occur if A is more reactive than B, thus giving a more stable product.
A synthesis reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds, while the product is always a compound.
Example: ammonia synthesis,
N₂ + 3H₂ ⇄ 2NH₃
All matter in the Universe consists of many substances called elements.
True
False
All matter is composed of atoms that have specific properties and cannot be subdivided.
Explanation:All matter is composed of extremely small particles called atoms. Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass, and other properties. Atoms cannot be subdivided, created, or destroyed.
Atomic Composition
The concept that all matter is composed of atoms was first proposed by the ancient Greek philosopher Democritus around 400 BCE. He suggested that these atoms were indivisible and indestructible. However, it was not until the early 20th century that experimental evidence confirmed the existence of atoms as the fundamental units of matter.
Subatomic Particles
Protons, neutrons, and electrons are the three primary subatomic particles that constitute an atom. Protons carry a positive charge, neutrons have no charge (they are neutral), and electrons carry a negative charge. The number of protons in an atom determines its atomic number, which in turn defines the element’s identity. Neutrons contribute to the mass of the atom, while electrons are involved in chemical bonding and determining the atom’s reactivity.
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What is the charge of the hydride ion?
Answer:
Negative 1.
Explanation:
Negative 1:- H-.
Examples of Hydrides are KH, NaH and LiAlH4.
the atmosphere is held together by
Answer:
Earth's gravity
Explanation:
Atmosphere is formed by the set of different layers of gases together, thus forming atmosphere. The Earth's atmosphere protects us by absorbing the UV rays coming from the Sun. These gases are held together forming an envelop because of the gravity of the Earth. It mainly comprises of 78% of Nitrogen, 20.9% of the oxygen, 0.9% of argon, approximately 0.035% of Carbon dioxide, water vapor, and other gases present in negligible amount.
Gravity is the force which holds the atmosphere together, pulling gases towards the Earth's center and preventing them from dispersing into space.
Explanation:The atmosphere is primarily held together by gravity, the force that keeps all the planets, stars, and galaxies in space intact. Gravity pulls everything towards the center of the Earth, including the gases that make up our atmosphere. This constant pull prevents the gases that make up the earth's atmospheric layers from dispersing into space. It keeps oxygen, nitrogen, carbon dioxide, and other atmospheric gases near the surface of the Earth which is vital for life to exist.
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