Answers
Answer:
Potassium (K) has 19 protons.
Each neutral atom of Potassium has 19 electrons.
Explanation:
A) Potassium has 19 protons because the atomic number tells us how many protons are in an atom of the element. (The atomic number is the number above the element symbol. For example, the number above "K" is 19, which is the atomic number).
B) If an atom is neutral, this means that the atom has neutral energy. Protons give positive energy and electrons give negative energy. For the atom to be neutral, the atom must have balanced energy, therefore, making the number of electrons equal to the number of protons in a neutral atom.
Related Questions
I need this answered!!For a testtt!!!!!!!
Answers
Explain how a piece of granite becomes a piece of gneiss?
sorry if this is the wrong subject, couldn't find geology.
Answers
Find the oxidation number of chromate in K2 Cr2 O7
Answers
Answer:Keys for Writing Formulas for Ternary Ionic Compounds: 1. Write the element symbol for the metal and its ...
Explanation:
Jason shot a bb straight up in the air with a velocity of 105 m/s.what will the velocity of the bb when it is at a height of 203 m?
Answers
Answer:
The velocity of the bb when it reaches a height of 203 m can be determined using the laws of projectile motion. Since the bb is moving vertically upwards, its velocity at that height will be zero.
brainlest?
Answer: v = 83.96 m/s
Assuming the acceleration due to gravity is approximately 9.8 m/s^2, we can use the principles of projectile motion and energy conservation.
Using the equation for the vertical displacement of an object in free fall:
Δy = (v₀² - v²) / (2g)
Δy = vertical displacement (203m)
v₀ = initial velocity (105 m/s)
v = final velocity (not known yet)
g = accerlation due to gravity (9.8 m/s^2)
Lets rearrange the equation to solve for the final velocity:
v = v = √(v₀² - 2gΔy)
Substituting the given values:
v = √(105² - 2 * 9.8 * 203)
v ≈ √(11025 - 3979.6)
v ≈ √(7054.4)
v ≈ 83.96 m/s
Therefore, when the BB pellet is at the height of 203m, its velocity will be approximately 83.96 m/s.
1 N2H4+ 2 H2O2 = 1 N2+ 4 H2O
if 0.750 mole N2H4 and 0.500 H2O2 are available for the reaction, how many grams of water can be made? (show your work for both problems)
Answers
The mass of water that can be made would be 36.03 grams.
Stoichiometric problemFrom the balanced chemical equation:
1 mole N2H4 produces 4 moles H2O2
0.750 mole N2H4 will produce = 0.750 x 4/1 = 3.000 moles H2O2 (limiting reactant)
0.500 mole H2O2 is used, which is less than the amount produced by N2H4, so it is also a limiting reactant.
Now, we can use the mole ratio between H2O2 and H2O to calculate the moles of water produced:
1 mole H2O2 produces 4 moles H2O
0.500 mole H2O2 will produce = 0.500 x 4/1 = 2.000 moles H2O (limiting reactant)
Finally, we can use the molar mass of water to convert the moles of water to grams:
2.000 moles H2O x 18.015 g/mol = 36.03 g H2O
Therefore, 36.03 grams of water can be made from the given amounts of N2H4 and H2O2.
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Can someone help me please. Will mark brainliest!
Which equation shows an increase in entropy?
Answers
What are differences between viruses and bacteria?
Answers
Answer:
viruses are computer program that replicate itself and distribute itself to another computer but bacteria is micro organism that contaminate our food and can make us sick
Two isotopes of oxygen are and 18/8O and 16/8O
Describe the similarities and differences between the isotopes
You should refer to the numbers of sub-atomic particles in each isotope.
Answers
Answer: Oxygen-16 and oxygen-18 differ in the number of neutrons in their nuclei. Oxygen-16 has 8 neutrons, while oxygen-18 has 10 neutrons.
Explanation: Oxygen-16 and oxygen-18 have the same number of protons and electrons. Both neutrons and protons have mass, so changing the number of neutrons changes the mass of oxygen.
How to determine the concentration of hydroxide ion in a saturated solution of zinc hydroxide?
Answers
The concentration of hydroxide ion in a saturated solution of zinc hydroxide can be determined through a series of steps.
To determine the concentration of hydroxide ion in a saturated solution of zinc hydroxide:
1. Calculate the molar solubility of zinc hydroxide (Zn(OH)2) using the solubility product constant (Ksp) value. This can be done by setting up an equilibrium expression and solving for the concentration of hydroxide ion (OH-) in terms of x (molar solubility of Zn(OH)2).
2. Convert the molar solubility of zinc hydroxide to the concentration of hydroxide ion by considering the stoichiometry of the balanced chemical equation. Since zinc hydroxide dissociates into one zinc cation (Zn2+) and two hydroxide ions (OH-), the concentration of hydroxide ion will be twice the molar solubility of zinc hydroxide.
3. Finally, substitute the molar solubility of zinc hydroxide into the expression obtained in step 2 to calculate the concentration of hydroxide ion in the saturated solution of zinc hydroxide.
In summary, to determine the concentration of hydroxide ion in a saturated solution of zinc hydroxide, calculate the molar solubility of zinc hydroxide using the solubility product constant, convert the molar solubility to the concentration of hydroxide ion, and substitute the molar solubility into the expression to obtain the concentration.
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when solid sodium hydroxide dissolves in water, the δh for the solution process is −44.4 kj/mol. if a 13.9 g sample of naoh dissolves in 250.0 g of water in a coffee-cup calorimeter initially at 23.0 °c. what is the final temperature of the solution? assume that the solution has the same specific heat as liquid water, i.e., 4.18 j/g·k.
Answers
The final temperature of solid sodium hydroxide dissolves in water is 355.88 kelvin.
A given amount of matter's heat capacity is the amount of energy needed to raise its temperature by one degree Celsius. While the heat capacity of 1 mole of a substance is known as its molar heat capacity, the heat capacity of 1 gram of a substance is referred to as its specific heat capacity (or specific heat). The equation q = mcT, where m is the mass of the sample, c is the specific heat, and T is the temperature change, can be used to determine how much heat is gained or lost by a sample (q).
Given
Mass of NaOH = 13.9 g
Mass of water = 250 gram
Specific heat of the solution = 4.18 j/g·k
Initial temperature = 23.0 °c or 296 kelvin
Heat evolved in process = −44.4 kj/mol
Q = mc (T₂ - T₁)
−44400 j/mol = 263.9 x 4.18 j/g·k x (T₂ - 296k)
T₂ = 355.88 k
Hence, final temperature of NaOH solution is 355.88 kelvin.
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4. Juan tiene un cilindro de 40 libras herméticamente cerrado con gas propano y lo conecta mediante una válvula a otro cilindro de 100 libras completamente vacío. Si Juan abre la válvula del cilindro de 40 dejando pasar el gas al de 100. responda
¿Qué cantidad de gas propano le haría falta al cilindro de 100 y por qué?
Answers
Answer:
Ver explicacion
Explanation:
Cuando el cilindro de 40 libras está conectado al cilindro de 100 libras, generamos una presión que continúa hasta que los dos cilindros alcanzan la misma presión de gas en equilibrio. Recuerde que el cilindro de 100 libras estaba inicialmente vacío. Esto significa que su presión inicial es 0. El cilindro de 40 libras ya estaba lleno, por lo que dividimos esta cantidad en dos para tener en cuenta su distribución entre los dos cilindros.
Ahora tenemos 20 libras de gas propano presentes en cada cilindro. La implicación de esto es que, en el cilindro de 100 libras, necesitamos 80 libras adicionales para completar las 100 libras.
what is the approximate mass of an atom that contains 26 protons 26 electrons and 19 neutrons
Answers
Answer:
The mass of an atom is equal to the protons plus neutrons. Protons and neutrons are particles located inside the nucleus of an atom and give an atom most of it's mass. Therefore, all we need to do is simply add 26+19 to get 45 as the correct answer, making choice 2 correct.
describe the thought process you used to determine the number of nitrogen atoms in beryllium nitrite.
Answers
Answer:
The number of nitrogen molecules inside of berylluim nitrite are 5 cells.
Explanation:
Use the reaction given below to solve the problem that follows: Calculate the mass in grams of aluminum oxide produced by the reaction of 15.0 g of aluminum metal.
[ ]grams Al2O3
4 Al + 3 O2 --> 2 Al2O3
**Your answer should be written as XX.X
Answers
Answer: 28.4 g of aluminum oxide is produced by the reaction of 15.0 g of aluminum metal
Explanation:
To calculate the moles :
\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)
\(\text{Moles of} Al=\frac{15.0g}{27g/mol}=0.556moles\)
The balanced chemical equuation is:
\(4Al+3O_2\rightarrow 2Al_2O_3\)
According to stoichiometry :
4 moles of \(Al\) produce == 2 moles of \(Al_2O_3\)
Thus 0.556 moles of \(Al\) will produce=\(\frac{2}{4}\times 0.556=0.278moles\) of \(Al_2O_3\)
Mass of \(Al_2O_3=moles\times {\text {Molar mass}}=0.278moles\times 102g/mol=28.4g\)
Thus 28.4 g of aluminum oxide is produced by the reaction of 15.0 g of aluminum metal.
PLS PLS SOMEONE HELP ME ANSWER THESE QUESTIONS PLEEEAAASSSE!!
(press on the picture so you can see the questions better!)
Answers
Answer:
1)conduction
2) convection
3) conduction
4) radiation
5) radiation
6) radiation
7) conduction
8) conduction
9) radiation
10) convection
Explanation:
not 100% sure
In 1828, Friedrich Wöhler produced urea
when he heated a solution of ammonium
cyanate. This reaction is represented by the
balanced equation below.
H 7+
H-N-H[C=N-O]
I
H
Ammonium
cyanate
H O
\/
N-CIN
H
Urea
Explain why this balanced equation represents a
conservation of atoms.
H
H
Answers
This balanced equation represents the principle of conservation of atoms, which is a fundamental principle of chemistry in the sense that the number and type of atoms are the same on both sides which means that no atoms were created or destroyed during the reaction, only rearranged to form new molecule.
What is a balanced equation?A balanced equation is described as an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.
Analyzing the diagram,
On the left-hand side we have :1 nitrogen atom (N)
3 hydrogen atoms (H)
1 carbon atom (C)
2 oxygen atoms (O)
On the right-hand side:1 nitrogen atom (N)
4 hydrogen atoms (H)
1 carbon atom (C)
2 oxygen atoms (O)
This can only mean that no atoms were created or destroyed during the reaction, only rearranged to form new molecules.
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Which of the 3 particles can never change without changing the identity of the atom?
Answers
Answer:
Neutrons,Electrons and Protons I think.
A molecule contains 16 atoms and undergoes a chemical change. How does the chemical change affect the roral number of aroms of each
element?
A.
It changes to zero.
B.
It decreases.
C.
It remains the same.
D.
It increases
Answers
Answer:
When a molecule contains 16 atoms and undergoes a chemical change it changes to zero
write differences between homogeneous mixture and heterogeneous mixture
Answers
Answer:
Homo means same
Hetero means different.
Homogeneous mixtures have one phase, it all looks the same, Fruit juice is homogeneous, solutions are homogeneous.
Heterogeneous mixtures have different phases, you can see the different parts, pepper is an example of a heterogeneous mixture.
A homogeneous mixture - Think Kool Aid (Completely Dissolved)A heterogeneous mixture - Like pepper poured into a glass of milk.In a homogeneous mixture the constituents are able to dissolve in each other due to their similar intermolecular forces, whereas in a heterogeneous mixture the constituents are not miscible- meaning they can't dissolve in each other.
To clarify: intermolecular forces describe the way that types of molecules will interact with each other. For instance, water (a polar molecule) and naphthalene (a non-polar molecule) are said to be "immiscible" because their intermolecular forces do not match. The saying goes: "like dissolves like". Meaning that molecules that have similar IFs will be mutually soluble (miscible, in other words).
Homogenous means the same all over...every cubic millimeter is about the same as every other one. Like water or soda.Heterogenous means difference in places, like salsa, with slightly different chunks of stuff depending on where you dipped your chip.They are evenly distributed through the mixture like air or blood
Heterogeneous mixtures usually have like very visible components which means that the substances are not evenly distributed like pizza or cookies(think of the chocolates or how many slices of pepperoni.. not am exact amount
[Poiseuille's Law] [S] Poiseuille's Law states that the resistance of blood flow in an artery (with units of mmHg) can be modeled as
R(L,r) = kL/r^4 where L is the length of the artery (in cm) and r is the radius of the artery (in mm), and k is a constant which depends mainly on the viscosity of the blood (among other factors).
(a) Calculate R_L (L, r) and R_r (L, r) and interpret their meaning, including units and an interpretation of the sign of the derivative.
(b) Calculate R_rr (L, r) and R_rL (L, r) and interpret their meaning, including units and an interpre- tation of the sign of the derivative.
Answers
(A) R_r represents the rate of change of resistance with respect to the radius of the artery, r. The units of R_r are mmHg/mm. A negative value for R_r indicates that an increase in the radius of the artery will result in a decrease in resistance, meaning it becomes easier for blood to flow through the wider artery.
(b) The derivative is zero because the resistance with respect to the radius does not depend on the length of the artery.
(a) To calculate R_L (L, r), we differentiate the equation with respect to L while keeping r constant:
\(R_L(L, r) = d/dL (kL/r^4) = k/r^4\)
R_L represents the rate of change of resistance with respect to the length of the artery, L. The units of R_L are mmHg/cm. A positive value for R_L indicates that an increase in the length of the artery will result in an increase in resistance, meaning it becomes harder for blood to flow through the longer artery.
To calculate R_r (L, r), we differentiate the equation with respect to r while keeping L constant:
\(R_r(L, r) = d/dr (kL/r^4) = -4kL/r^5\)
R_r represents the rate of change of resistance with respect to the radius of the artery, r. The units of R_r are mmHg/mm. A negative value for R_r indicates that an increase in the radius of the artery will result in a decrease in resistance, meaning it becomes easier for blood to flow through the wider artery.
(b) To calculate R_rr (L, r), we differentiate R_r (L, r) with respect to r while keeping L constant:
\(R_rr(L, r) = d/dr (-4kL/r^5) = 20kL/r^6\)
R_rr represents the rate of change of R_r with respect to r. The units of R_rr are mmHg/mm^2. A positive value for R_rr indicates that as the radius of the artery increases, the rate of decrease in resistance increases. In other words, the wider the artery becomes, the easier it is for blood to flow through.
To calculate R_rL (L, r), we differentiate R_r (L, r) with respect to L while keeping r constant:
\(R_rL(L, r) = d/dL (-4kL/r^5) = 0\)
R_rL represents the rate of change of R_r with respect to L. The units of R_rL are mmHg/(cm·mm). The derivative is zero because the resistance with respect to the radius does not depend on the length of the artery. This implies that changes in the length of the artery do not affect the rate of change of resistance with respect to the radius.
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What is the correct order of events for cellular respiration?.
Answers
Thus, glycolysis, oxidative decarboxylation, Krebs cycle, electron transport chain, and oxidative phosphorylation are the processes of cellular respiration that should be performed in that order.
Which 5 processes include cellular respiration?The Krebs cycle, also called the citric acid cycle, transition reaction, pyruvate oxidation, and oxidative phosphorylation via the electron transport chain are the four steps of cellular respiration in eukaryotes.
A metabolic mechanism called cellular respiration breaks down glucose and generates ATP. The phases of cellular respiration include glycolysis, pyruvate oxidation, the Krebs cycle (or citric acid cycle), and oxidative phosphorylation.
In the cytoplasm of your cells, glycolysis—the first phase of cellular respiration—takes place. In this procedure, a glucose molecule is split into two pyruvate molecules (pyruvic acid).
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What is a technique for gene therapy?
Answers
Answer:
For gene therapy, stem cells can be trained in a lab to become cells that can help fight disease. Liposomes. These fatty particles have the ability to carry the new, therapeutic genes to the target cells and pass the genes into your cells' DNA.
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F= G = mass(1) x mass(2)
6.67 x 10x-11
Answers
Answer:
6.67 x 10 -11 N-m2/kg2
Explanation:
Gravity Formula Questions: 1) What is the gravitational force acting upon two objects of masses 15 g and 15 kg, that are 11 m apart? Answer: the gravitational constant, G, is defined as 6.67 x 10 -11 N-m2/kg2 ; m1 = 15 g = 0.015 kg; m2 = 15 kg; r = 11m.
solid potassium chlorate is heated in the presence of manganese dioxide as a catalyst
Answers
When solid potassium chlorate is heated in the presence of manganese dioxide as a catalyst.
When solid potassium chlorate is heated in presence of manganese dioxide as a catalyst, then a chemical reaction takes place, which can be represented by below equation:
2KClO₃ → 2KCl + 3O₂
Potassium chlorate decomposes completely on heating to form potassium chloride and oxygen gas. Manganese dioxide (MnO₂) acts as a catalyst, which speeds up the rate of the reaction without being used up itself. It does this by providing a surface for the reaction to occur, thereby reducing the activation energy required for the reaction to proceed.
The reaction is exothermic reaction, which means it releases heat. The amount of heat released depends upon the amount of potassium chlorate that is decomposed. This reaction is often used in lab experiments to produce oxygen gas for various purposes.
Catalysts are substances that increase the rate of a chemical reaction without using up itself in the process. They work by providing an alternative reaction pathway that has a less activation energy. This makes it easier for the reactants to react and form the products in an chemical recation.
Catalysts are important in many industrial processes because they can increase the efficiency of the process and lower the amount of energy required.
In conclusion, when solid potassium chlorate is heated in the presence of manganese dioxide as a catalyst, it decomposes to form potassium chloride and oxygen gas in chemaical reaction. This reaction is exothermic and is many times used to produce oxygen gas.
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Although I am in the middle of the 5 stages, I am just as important
as the first and the last. As soon as you see a leaf sprout, you are
sure to be in my stage. Who am I?
This is annoying
Answers
Answer: The final stage of the life cycle of a tree is when it has fully grown and reached the ... You should be confident in your supplier's approach to sustainability. ... This is the first occasion you will see a stem and perhaps a couple of leaves. ... The next phase is the sapling stage, this is when the sprout continues to grow and has ...
Explanation:
create the molecule that corresponds to this name (e)-3-methyl-3-hexene
Answers
The (E)-stereochemistry is displayed by having the highest-priority substituents (the ethyl and methyl groups) on opposite sides of the double bond.
To create the molecule that corresponds to the name (E)-3-methyl-3-hexene, follow these steps:
1. Identify the parent chain:
The name indicates that it is a hexene, which means there are six carbon atoms in the longest continuous chain and a double bond present.
2. Locate the double bond:
The "3" in 3-hexene indicates that the double bond starts at the 3rd carbon.
3. Determine the stereochemistry:
The (E) designation signifies the two highest-priority substituents on each carbon of the double bond are on opposite sides.
4. Add the methyl group:
The 3-methyl indicates that a methyl group (CH3) is attached to the 3rd carbon atom in the chain.
Your molecule will have the following structure:
CH3-CH2-CH=CH-CH(CH3)-CH3
In this molecule, the double bond is between the 3rd and 4th carbon atoms, and there is a methyl group attached to the 3rd carbon.
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what is an unsaturated solution
Answers
Unsaturated solution: a solution in which more solute can be dissolved.
Explanation:
Salt dissolved in water or even sugar dissolved in water is an unsaturated solution if the quantity of dissolved salt/sugar is below the saturation point.
unsaturated solution: a solution in which more solute can be dissolved.
Explanation:
A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the container.
Which atom has a mass of 12 u
Answers
Answer:
carbon-12
Explanation:
One atomic mass unit is approximately the mass of Hydrogen-1, a proton, a neutron, and precisely one-twelfth the mass of Carbon-12, meaning that Carbon-12's atomic mass is 12u.
The mass of carbon atom is 12 u.
What is mass ?The mass of a thing is a measurement of how much matter it contains.
What is carbon?Carbon is just a chemical substance with both the atomic number 6 and the symbol C.
The atomic number carbon is 6 and atomic mass is 12 u
Therefore, the carbon atom posses 12 u mass.
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Which of these elements would have an electron affinity higher than that of oxygen?
Li
Ca
Ne
C
Be
Answers
Answer: Ne ( Neon )
Explanation: Lithium ( Li ), beryllium ( Be ), carbon ( C ), oxygen ( O ), and neon ( Ne ), are all in Period 2 in that order. Sodium ( Na ) is in Period 3. Since electron affinities decrease as you go down, Na would have a lower electron affinity level then Li but since electron affinities increase as you go across a period, only neon is farther right then oxygen ( O ), so it would be the only one element of this group that would have a higher electron affinity than that of oxygen.
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Option C is correct option.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
On going down the group electronegativity decreases. On going along the period the electronegativity increases. So, Neon lies on the extreme right of Fluorine in the same period. Neon will have more electronegativity than oxygen.
Therefore, Neon is more electronegativity than fluorine.
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when should a student request a replacement liquid hazardous waste bottle for the lab?
Answers
A student should request a replacement liquid hazardous waste bottle for the lab when the current bottle is full or nearing its capacity, or if it is damaged or compromised in any way that could lead to leaks or spills. It is important to handle and dispose of hazardous waste properly to ensure the safety of both the individuals working in the lab and the environment.
When the liquid hazardous waste bottle is close to being full, it increases the risk of spills or overflows, which can be hazardous and pose a threat to health and safety. Therefore, it is important to request a replacement bottle to ensure that there is sufficient space to collect and store additional hazardous waste materials.
Additionally, if the current bottle is damaged or compromised, it can increase the likelihood of leaks or spills, which can lead to exposure to hazardous substances. In such cases, it is essential to request a replacement bottle promptly to prevent any accidents or environmental contamination.
By requesting a replacement liquid hazardous waste bottle when necessary, students can maintain a safe and compliant laboratory environment while ensuring the proper handling and disposal of hazardous waste materials.
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