Answer:
THe atomic number of an element is the same number of protons and electrons the element has.
Explanation:
The atomic number is the number of protons that is equal to the of electrons. Also, the mass numbers can be used for the number of neutrons. So the isotope of the element and its valency can be determined by the atomic number and mass number.
What is the atomic number?Because they are calculated by counting whole items, the atomic b and mass number are always whole values (protons, neutrons, and electrons). The total number of subatomic particles found in an atom is equal to the sum of the mass number and atomic number for an atom (A-Z). The mass number indicates, in atomic mass units, the mass of the atom's nucleus (amu).
The amount of protons each element has determined its atomic number, which is used to distinguish one element from another. The total number of protons and neutrons in an element determines its mass number.
All of the elements in the contemporary periodic table have rising atomic numbers, and as a result, increasing mass numbers. As you are aware, an atom is made up of protons, neutrons, and electrons.
We can determine an atom's valency by counting the number of electrons in its outermost shell. Similar to this, the atomic number and mass number of the atom are related to the number of protons and neutrons.
Therefore, the knowledge of the atomic number and mass number can help in determining the valency and isotope of the element.
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Small pools of water with ocean life.
One day, while walking along the coast, you encounter the area pictured here. You notice that most of the water is gone at low tide and that an abundance of life lives in this area.
To which ocean zone does this area belong?
Answer:
Intertidal zone (i think)
Explanation:
Answer:
A
Explanation:
Analyze the given diagram of the carbon cycle below. Use complete sentences to explain your answer.
Part 1: Which process does arrow F represent?
Part 2: Explain how matter is conserved during the process.
Part 3: Justify why this process is a recycling of carbon in the carbon cycle.
Answer:
I'm not to sure I'll ask one of my frens to help
150.0 mL of oxygen is collected over water at 19.0oC and 100.0 kPa. If the dry volume becomes 100.0 mL and the pressure of the dry gas becomes 105.0 kPa, what will the new temperature be?
Answer:
The new temperature will be 204.4 K
Explanation:
As the volume increases, the particles (atoms or molecules) of the gas take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:
"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"
Boyle's law is expressed mathematically as:
Pressure * Volume = constant
or P * V = k
Charles's Law consists of the relationship between the volume and the temperature of a certain quantity of ideal gas, which is kept at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .
In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Finally, Gay-Lussac's law can be expressed mathematically as follows:
[tex]\frac{P}{T} =k[/tex]
This law indicates that the quotient between pressure and temperature is constant.
This law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the molecules of the gas move faster. Then the number of collisions against the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
[tex]\frac{P*V}{T} =k[/tex]
You want to study two different states, an initial state and a final state. It will happen:
[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]
In this case:
P1= 100 kPaV1= 150 mLT1= 19 C= 292 K (being 0 C= 273 K)P2= 105 kPaV2= 100 mLT2=?Replacing:
[tex]\frac{100 kPa*150 mL}{292 K} =\frac{105 kPa*100 mL}{T2}[/tex]
Solving:
[tex]T2=105 kPa*100 mL*\frac{292 K}{100 kPa*150 mL}[/tex]
T2= 204.4 K
The new temperature will be 204.4 K
what caused the falling of the twin towers?
Answer:
ok horita te ayudo ok esperame okey bueno
George W. Bush lol nvm just trolling.
Correct answer is Alquaida flew with 2 airplanes into the twin towers at the 11. September 2001
50.0 ml of 2.60 M HBr(aq) was exactly neutralized (final pH=7) by a 1.80 M solution of NaOH(aq). How much volume of of the NaOH solution was added ?
Answer:
72.2 ml
Explanation:
The neutralization equation between HBr (acid) and NaOH (base) is the following:
HBr(aq) + NaOH(aq) → NaBr(aq) + H₂O(l)
We can see that 1 mol of HBr reacts with 1 mol of NaOH. At the equivalence point, the total number of moles of HBr reacts with the total number of moles of NaOH. The number of moles can be calculated as the product between the molarity (M, in mol/L) and the volume (V). So, we can equal the quantities of acid and base, as follows:
moles HBr = moles NaOH
M(HBr) x V(HBr) = M(NaOH) x V(NaOH)
Now, we calculate the volume of NaOH with the data:
V(NaOH)= M(HBr) x V(HBr)/M(NaOH)
= (2.60 mol/L x 50.0 ml)/(1.80 mol/L)
=72.2 ml
A 1.00 L volume of dry air is sealed inside of a round flask and brought to a temperature of 50.0°C in
a hot water bath. If the pressure gauge reads 3.60 atm, how many moles of gas are in the sample of
air?
Answer:
0.136mol
Explanation:
Using the general gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (Litres)
n = number of moles (mol)
R = gas constant (0.0821 Latm/mol K)
T = temperature (K)
K = °C + 273
K = 50°C + 273
K = 323K
According to this question, P = 3.6atm, T = 323K, V = 1.00L, R = 0.0821 Latm/mol K, n = ?
3.6 × 1 = n × 0.0821 × 323
3.6 = 26.52n
n = 3.6/25.52
n = 0.1357
n = 0.136mol
What is the ground state electron configuration for K
Explanation:
The ground state electron configuration of ground state gaseous neutral potassium is 4s1 and the term symbol is 2S1/2.
What trend in atomic radius occurs down a group on the periodic table? What causes the trend?
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Explanation:
the further down the group you go, the larger the radius becomes. its caused by the amount of electrons needed to equal out the charge of the nucleus
Atomic radius increases down the group in the periodic table and due to the increase in the number of shells.
Explanation:
The group in the periodic table is a vertical column running from top to bottom.There is a total of 18 groups in the modern periodic table.Elements in the same group have the same number of valence electrons and chemical and physical properties.When we move down in a group the atomic radii of the elements increases because the number shell increases which results in increase atomic radii of the elementsMetallic character increases on moving down Non-metallic character decreases on moving down Ionization energy decreases down the group as the atomic size increases the distance of valence electrons from the nucleus also increases which reduces the effective nuclear charge on the valence electrons.So, from this, we can conclude that atomic radius increases down a group in the periodic table and due to the increase in the number of shells.
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Enter a balanced nuclear equation for the production of lutetium-177, used in the treatment of some cancers, from the beta decay of ytterbium-177.
Answer: [tex]_{70}^{177}\textrm{Yb}\rightarrow _{71}^{177}\textrm{Lu}+_{-1}^{0}\textrm{e}[/tex]
Explanation:
Beta-decay: In this process, a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released is basically a electron with -1 charge and no mass.
[tex]_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{X}+_{-1}^{0}\textrm{e}[/tex]
General representation of an element is given as:
where,
Z represents Atomic number
A represents Mass number
X represents the symbol of an element
[tex]_{70}^{177}\textrm{Yb}\rightarrow _{71}^{177}\textrm{Lu}+_{-1}^{0}\textrm{e}[/tex]
Pb(OH)4 + Cu2O --> PbO2 + CuOH what is the balanced equation
Answer:
Pb(OH)4 + 2Cu2O → PbO2 + 4CuOH
Explanation:
Pb(OH)4 + Cu2O --> PbO2 + CuOH
The end goal of balacing chemical equations is to make sure there is no gain or loss of atoms of elements. Number of atoms of elements in the left side (reactant) must balance with the right side (product) of the reaction.
Currently, the number of Cu, H and O atoms are not balanced.
Pb
Reactant = 1, Product = 1
O
Reactant = 5, Product = 3
Cu
Reactant = 2, Product = 1
H
Reactant = 4, Product = 1
The balanced equation is given as;
Pb(OH)4 + 2Cu2O → PbO2 + 4CuOH
Pb
Reactant = 1, Product = 1
O
Reactant = 6, Product = 6
Cu
Reactant = 4, Product = 4
H
Reactant = 4, Product = 4
what is Pb+FeSO4-->PbSO4+Fe balanced and the type of reaction?
Answer:
It's simple substitution reaction and there is no balance for the equation. It's right written.
Explanation:
Please help if you can't see the awnsers there
A cytosine and Adenine
B adenine and deoxyribose
C cytosine and gallium
D phosphate and ribose
Rank the following elements by increasing atomic radius: Carbon, aluminum, oxygen, potassium.
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Answer
The elements in increasing order of atomic radius: oxygen, carbon, aluminum, potassium
Explanation:
The distance from the center of the nucleus to the outermost shell of the electron is known as the atomic radius of an element. The atomic radius decreases rightward along each period (row) of the table due to the increase in effective nuclear charge (the charge of the nucleus equal to the number of protons). Across a period, electrons are added to the same energy level and the increasing number of protons causes the nucleus to exert more pull on these electrons, which makes the atomic radius smaller. Atomic radius increases down each group (column) of the periodic table because of the addition of electrons to higher energy levels, which are further away from the nucleus and the pull of nucleus weakens. Another reason for the increase in atomic radius is the electron shielding effect, which is the reduction of the attractive force between a nucleus and its outer electrons due to the blocking effect of inner electrons
While moving from left to right in the second period, c arbon comes before oxygen and so oxygen will have a smaller atomic radius than carbon. While moving down the periodic table, al uminum comes before potassium even if they are not in the same period. So aluminum 's atomic radius will be smaller than that of potassium but bigger than that of carbon and oxygen.
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200cm3 of hydrogen diffused through a porous pot in 40secs. How long will it take 300cm3 of chlorine to diffuse the same pot?
Look at the diagram below.
(+
When this atom becomes an ion, it will
(gain, lose)
electrons. The charge of this ion will be
ASAP QUICK
Answer:
if charge of ion is positive then it will loose electron
if charge of ion is negative it will gain electron
The element with 92 protons:
(I3) R A (D1) I U M
If an atom has 6 electrons in its valence shell, how many will it want to gain or loose?
Answer:
gain2 electrons
Explanation:
that the answer to that question
How many milliliters of 0.188 M HClO 4 solution are needed to neutralize 50.00 mL of 0.0789 M NaOH?
a) 119
b) 0.742
c) 21.0
d) 0.0477
e) 8.39x10^-3
119 so a I think that's Is me anser
The volume of space it takes up, whereas its mass is the amount of matter it contains. A sample's density is the quantity of mass per unit of volume.
Equation:[tex]HClO_4 +NaOH \longrightarrow NaClO_4 + H_2O\\\\[/tex]
HClO₄ is a monoprotic strong acid.
1 mol of HClO₄ reacts with 1 mol of NaOH for neutralization.
Calculating the moles of NaOH [tex]= (0.0789\ M) \times (0.050\ L) = 0.003945\ mol[/tex]
Calculating the needed moles in HClO₄ [tex]= 0.003945 \ mol[/tex]
Calculating the HClO₄ Molarity that is 0.188 M
Calculating the HClO₄ volume that is needed [tex]= \frac{(0.003945\ mol) }{ (0.188\ M)} = 0.020\ L[/tex]
Therefore, the volume of HClO₄ that is needed = 20 mL
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What is a fuel ?....................................
Answer:
A fuel is a natural substance that, when burned, produces energy (usually thermal/heat energy)
Answer:
Fuel is something that can be used to make some actions happen. Fuel is something that can be made to react with some other substances so that it releases energy as heat energy or some other kind of energy
12 G of carbon react with 16 G of oxygen how much carbon monoxide is formed
Answer:
28 g CO
Explanation:
First convert grams to moles.
1 mole C = 12.011 g (I'm just going to round to 12 for the sake of this problem)
12 g C • [tex]\frac{1 mol C}{12 g C}[/tex] = 1 mol C
1 mol O = 15.996 g (I'm just going to round to 16)
16 g O • [tex]\frac{1 mol O}{16 g O}[/tex] = 1 mol O
So the unbalanced equation is:
[tex]C + O_{2}[/tex] -> [tex]CO[/tex] (the oxygen has a 2 subscript because it is part of HONClBrIF meaning when not in a compound these elements appear in pairs - called diatomic elements)
The balanced equation is:
[tex]2 C + O_2[/tex] -> [tex]2 CO[/tex]
However, carbon is the limiting reactant in this equation and two moles cannot react because only 12 g (1 mole) are present. Therefore, use the equation
[tex]C + \frac{1}{2} O_2[/tex] -> [tex]CO[/tex].
1 mole of CO is formed, therefore 12 g + 16 g = 28 g CO.
how many molecules are in 2NaOH
Answer:
1 moles
I assume you are converting between moles 2NaOH and gram. You can view more details on each measurement unit: molecular weight of 2NaOH or grams The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles 2NaOH, or 41.99711 grams.
Explanation:
I hope this helps and pls mark me brainliest :)
Number of molecules are in 2NaOH are 12.044 × 10²³.
What is mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
Given are 2 moles of NaOH.
one mole of any substance and equals to 6.02214076 × 10²³
Therefore, Number of molecules are in 2NaOH are 12.044 × 10²³.
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Energy can be .................. From one form to another................. Can be burned to make heat or electricity.
Answer:
transferred
Energy
Explanation:
Energy is the ability to change the state of bringing about a work leading to movement or generating electromagnetic radiation. There are actually many forms of energy. So, kinetic energy is a form of energy related to the movement of a body. The combustion, in turn, retrieves the potential energy chemical contained in fuels. Solar panels capture light energy to transform it into electrical energy.
How does diffusion help cells maintain homeostasis as they produce energy through cellular respiration?
Answer:
Diffusion helps cells maintain homeostasis by allowing ions to move across the cell membrane to maintaing both the voltage across the membrane and the ion concentrations.
Diffusion helps in maintaining homeostasis by allowing movement of ions in and out across the cell.
What is diffusion?Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.
There are 2 main types of diffusion:
1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.
2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.
There are 2 types of facilitated diffusion one is osmosis and dialysis.
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PLS HELP DECODE THIS
The atomic number of an element tells you the number of:. P R O (G4) (E3) N S
Help please! This is due in 15 mins
PLEASE CAN SOMEONE EXPLAIN this FOR ME WHAT IS RADIOACTIVE ISOTOPES AND ANSWER THIS QUETION? A nitrogen atom has 7 protons and most common isotopes of nitrogen has 7 neutrons. A radioactive isotopes of nitrogen has 8 neutrons write the atomic number and mass number of this radioactive nitrogen as a chemical symbol with a subscript and superscript.
Answer:
[tex]\frac{15}{7}N[/tex]
Explanation:
We already know that the mass number of an atom is the sum of the number of protons and the number of neutrons.
So, the mass number of this isotope is;
Number of protons = 7
Number of neutrons = 8
Mass number = 7 + 8 = 15
Hence, the isotope is;
[tex]\frac{15}{7}N[/tex]
For an experiment, Yolanda rubs a cloth against a balloon and places the balloon next to running water. What happens? The balloon breaks from the pressure of the water. The charged balloon repels the water. The uncharged water is attracted to the charged balloon. The water spills over the balloon, and the balloon gets wet.
Answer:
The uncharged water is attracted to the charged balloon.
Explanation:
Electrostatics is the study of charges at rest. Neutral bodies have equal and evenly distributed positive and negative charges. However, these neutral bodies can become either positively or negatively charged. These charges can be produced by either of friction, contact or electrostatic induction.
For example, when an ebonite rod is rubbed with fur, the ebonite rod acquires a charge by friction. The ebonite rod becomes negatively charged while the fur is left with positive charges.
Similarly, for the experiment performed by Yolanda, when she rubs a cloth against a balloon, the balloon becomes negatively charged . Water is neutral in that it is composed of equal positive and negative charged particles. When she brings the balloon near the water, the positive charged particles in the water will move the water towards the negatively charged balloon since positive and negative charges are attracted to each other.
The specific heat of water is 4.2j/g ºC how much heat is required to raise the temperature of 100 g of water by 5 ºC
Answer:
116,823 J
Explanation:
formula : q=m C delta T
q = heat = unknown
mass = 100 g
C = specific heat = 4.2 J/K*g
delta T = temperture in Kelvins: 5 + 273.15 = 278.15 K
q = (100 g) ( 4.2 J/K*g) (278.15 K) = 116,823 J
If an atom has 5 protons, 5 neutrons and 5 electrons, what is the atom's atomic
number and atomic mass?
Answer:
Atomic mass is 10.81
Can you guys help me please!!!!
Answer:
i think it is true
Explanation:
if it correct plz plz mark as brainliest
thank you
19NBoli
Answer:
i hope my answer help you
Explanation:
a/true