Answer:
A
Explanation:
Chemicals are repeatedly tested, even those that have existed for
a long time.
When ions having a positive charge form bonds with ions having a negative charge, the charge on the resulting compound is negative.
Answer:
See below.
Explanation:
No, the resulting charge will be 0.
For example Na+ + Cl- ---> NaCl.
The sodium chloride formed is neutral ( NO CHARGE).
Contrary to the original assertion, the charge on an ionic compound is not negative but rather neutral, as the total positive charges of the cations balance the total negative charges of the anions. Ionic compounds are formed when cations and anions bond due to electrostatic attraction, resulting in a neutral compound.
When ions with a positive charge, known as cations, form bonds with ions with a negative charge, known as anions, the result is an ionic compound. Contrary to the statement in the question, the overall charge on the resulting ionic compound is not negative. Instead, ionic compounds are electrically neutral because the total number of positive charges and negative charges balance each other out.
Ions form when atoms gain or lose electrons. A cation is formed by the loss of electrons and maintains a positive charge, while an anion is created by the gain of electrons and carries a negative charge. The ionic formula represents a balance of the total positive and negative charges so that the compound is electrically neutral.
For example, in sodium chloride (NaCl), sodium (Na+) is the cation with a +1 charge and chloride (Cl-) is the anion with a -1 charge. The charges balance out (+1-1=0), and the resulting compound is neutral. Similarly, in magnesium oxide (MgO), magnesium has a +2 charge and oxygen has a -2 charge, which also balance out to give a neutral compound.
The electrostatic attraction between these oppositely charged ions forms what is known as an ionic bond. Ionic bonds are strong and result in the formation of a structured ionic lattice or network. This attraction is explained by the principle that opposite charges attract, a fundamental concept in electrostatics.
What is the mass of 8 moles of sodium atoms
Answer:
183.91816000000145
Explanation:
How many particles would be found in a 1.224 g sample of K2O
Answer:
7.8286×10²¹ particles.
Explanation:
First we need to calculate the total molar mass of the compound, in this case:
Potassium (K) = 39.1 g/mol × 2 = 78.2 +
Oxigen (O) = 16 g/mol × 1 = 16
Total(K₂O) = 94.2 g/mol
Then, we calculate the number of moles of the compound in the sample, this is done dividing de mass of the sample by the molar mass:
[tex]mol =\frac{1.224 g}{94.2 g/mol}[/tex]
mol = 0.013 moles in our sample.
Finally, we calculate the total number of particles. The costant known as Avogadro number (6.022×10²³) is the number of particles or atoms contained in a mole of any substance. We need to multiply the number of moles by the Avogadro number.
particles = 0.013 mol × (6.022×10²³ particles/mol) = 7.8286×10²¹ particles.
The sample contains approximately 7.83 x 10²¹ particles.
To find the number of particles in a 1.224 g sample of K₂O, follow these steps:
1. Calculate the molar mass of K₂O:
Potassium (K) has an atomic mass of 39.10 g/mol. Since there are two potassium atoms in K₂O:2 * 39.10 g/mol = 78.20 g/molOxygen (O) has an atomic mass of 16.00 g/mol.So, the molar mass of K₂O = 78.20 g/mol + 16.00 g/mol = 94.20 g/mol.2. Determine the number of moles of K₂O in 1.224 g:
Moles of K₂O = mass (g) / molar mass (g/mol)Moles of K₂O = 1.224 g / 94.20 g/mol ≈ 0.013 mol3. Calculate the number of particles:
One mole of any substance contains Avogadro's number of particles, which is 6.022 x 10²³.Number of particles = moles * Avogadro's number Number of particles = 0.013 mol * 6.022 x 10²³ ≈ 7.83 x 10²¹ particlesTherefore, a 1.224 g sample of K₂O contains approximately 7.83 x 10²¹ particles.
What is the equation fort the alkaline zinc/manganese dioxide cell.
A) Anode
B)Cathode
C)Overall equations.
Answer:
An electrolyte is used in an alkaline zinc/manganese dioxide cell. There are two electrodes in the battery, one is positive (zinc) and the other is negative (manganese dioxide). Oxidation takes place at anode, while at cathode reduction reaction occurs.
The half-reactions are:
Reaction at Anode:
Zn(s) + 2OH−(aq) → ZnO(s) + H2O(l) + 2e− (Oxidation)
Reaction at Cathode:
2MnO2(s) + H2O(l) + 2e− → Mn2O3(s) + 2OH−(aq) (Reduction)
Overall Reaction:
Zn(s) + 2MnO2(s) ⇌ ZnO(s) + Mn2O3(s)
what does the process of natural selection involve
Answer:
Only the organisms best adapted to their environment tend to survive and transmit their genetic characters in increasing numbers to succeeding generations while those less adapted tend to be eliminated.
Explanation:
According to Darwin's Theory of Evolution.
Hope this helped.
Final answer:
Natural selection is the process by which organisms with traits that better enable them to adapt to their environment tend to survive and reproduce. It acts on the population's heritable traits, selecting for beneficial alleles and against deleterious alleles.
Explanation:
Natural selection is the process by which organisms with traits that better enable them to adapt to their environment tend to survive and reproduce in greater numbers. It acts on the population's heritable traits, selecting for beneficial alleles that increase their frequency and selecting against deleterious alleles. Natural selection is not random, as it favors variants that are better able to survive and reproduce.
How does this equation help you to understand acids and bases: H+(aq) + OH-(aq)
A. It shows you how water is formed
B. It shows you that water can be written as HOH.
C. It shows you that water is a reversible reaction, which contains hydrogen and hydroxide ions.
Please help ASAP!!
Answer:
C. It shows you that the formation of water is a reversible reaction, which contains hydrogen and hydroxide ions.
Explanation:
The equation is
H₂O(ℓ) ⇌ H⁺(aq) + OH⁻(aq)
It also shows that water can behave as either an acid or a base, because it can produce both H⁺ and OH⁻ ions.
A and B are both wrong. Although the statements are correct, they don't say anything about acids and bases.
Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below. Potassium (K): 1s22s22p63s23p64s1
Answer:
The number of core electrons = 18 electrons.
The number of valence electrons = 1 electron.
Explanation:
The core electrons are the electrons in the inner shells (1s²2s²2p⁶3s²3p⁶).∴ the number of core electrons = 18 electrons.
The valence electrons are the electrons in the outermost shell (4s¹).
∴ the number of valence electrons = 1 electron.
Answer:
18 core electrons
1 valence electron
Explanation:
In the periodic table, potassium stands at the head or beginning of the fourth period. It is found in group 1. The third period ends with argon having 18 electrons. This implies that potassium should have at least 18 core electrons. Since it is found in group 1 having only 1 valence electron, it is expected to also have one valence electron.
Its electron configuration summarizes these statements above; 1s22s22p63s23p64s1
There are 18 core electrons and one valence electron in the outermost 4s1 orbital (the fourth shell)
the chemical formula of chalk is CaCO3. Identify the elements and calculate the number of atoms of each element in the smallest unit of chalk
8/3Li decays to 8/4. what type of decay is this
Answer:
It is called Radioactive Decay.
how many prime numbers are there between 0 and 75
Answer:
There are 21 prime numbers between 0 and 75.
Explanation:
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73
Answer:
21
Explanation:
There are 21 prime numbers between 0 and 75.
These include:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73.
what is the Bronsted Acid in the following equation:
NO2- +H2O \longrightarrow ⟶ HNO2 + OH-
Answer:
[tex]NO_2^-[/tex]
Explanation:
[tex]NO_2^- + H_2O\rightarrow HNO_2+OH^-[/tex]
A Bronsted acid is a substance which donates protons to another substance.
In this case, [tex]H_2O[/tex] is donating a proton to the nitrite ion.
Thus, it is the Bronsted acid in this equation.
Answer:
H₂O is the Bronsted Acid in this reaction.
Explanation:
A Brønsted-Lowry acid is any species capable of donating a proton (H+).
A Brönsted-Lowry base is a substance capable of gaining or accepting a proton (H+).
In this way, the acid-base reaction is one in which a transfer of protons from the acid to a base occurs.
This theory, unlike Arrhenius theory does not require the presence of water as a solvent, but includes any type of solvent.
The conjugate acid of the base, is the one that is formed when the base receives an H +
The conjugate base of the acid is the base formed when the acid yields an H +.
In this case, you have:
NO₂⁻ + H₂O → HNO₂ + OH⁻
Water acts as an acid yielding a proton to NO₂⁻, which in turn acts as a base and forms the HNO₃ conjugate base.
at 450 mm Hg a gas has a volume of 760 L, what is its volume at standard pressure
Answer:
450.0 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have different values of P and V:(P₁V₁) = (P₂V₂).
V₁ = 760.0 L, P₁ = 450.0 mm Hg,
V₂ = ??? L, P₂ = 760.0 mm Hg (standard pressure = 1.0 atm = 760 mm Hg).
∴ V₂ = (P₁V₁)/(P₂) = (760.0 L)(450.0 mm Hg)/(760.0 mm Hg) = 450.0 L.
in which media would light have the shortest wavelength ? ice ? glass ? water ? diamond
Answer:
Diamond
Explanation:
As light moves from a less dense medium to a denser medium it slows down.
This is because the wave length of the light reduces. The denser the medium the less the wavelength. Diamond is the most dense solid among the provided choices thus light travelling through it has the least wavelength.
Answer:
Diamond.
Explanation:
Wavelength may be defined as the distance between two consecutive crest or trough of a wave. The S.I. unit of wavelength is meter.
Refractive index is inversely proportional to wavelength. The media with high refractive index has the shortest wavelength. Refractive index of ice is 1.31, refractive index of glass is 1.5, refractive index of water is 1.33 and refractive index of diamond is 2.4.Since, diamond has highest refractive index so it has shortest wavelength.
Thus, the correct answer is option (4).
How is 0.00235 expressed in proper scientific notation?
A. 2.35 × 10-3
B. 0.235 × 10-2
C. 2.35
D. 2.35 × 103
Answer:
A
Explanation:
it's always a _.___x10^____
You move the decimal three places to the right for this one, so negative 3
Any number less than 0 will have a negative exponent beside the base number 10
The correct option is: A. The number 0.00235 in proper scientific notation is written as 2.35 × 10⁻³ because the decimal moves three places to the right, making the exponent -3.
To express 0.00235 in proper scientific notation, follow these steps:
Move the decimal point so that there is only one non-zero digit to its left. For 0.00235, this would be 2.35.Count the number of places the decimal has moved. Here, it has moved 3 places to the right.Since the decimal moved to the right, the exponent will be negative. The final scientific notation is 2.35 × 10⁻³.Therefore, the correct answer is A. 2.35 × 10⁻³.
What is the significance of the discovery: E = mc2? Mass moving at the speed of light has energy. Any moving mass emits energy. Mass and energy can convert to one another. none of the above
Answer:
Mass and energy can convert to one another
Explanation:
The mathematical expression E = mc² is known as the Einstein equation. Here:
E= energy
m = mass
c = velocity of light.
The equation shows that mass and energy are inter-convertible and they relate to one another. It implies that a given mass would have an equivalent amount of energy it can produce or generate and also vice versa. We also see that energy is also associated with mass. This equation is very useful in understanding nuclear reactions.
Answer:
Mass and energy can convert to one another
Explanation:
What would happen to a volleyball left outside in the winter?
O
O
O
O
A. It would expand.
B. It would lose air.
C. It would shrink.
D. It would explode.
Answer:
it would shrink.
Explanation:
it doesnt loose air, but as the air gets colder it hits the sides less. it eventually goes flat
Volleyball left outside in the winter would lose air. The correct option is option B.
When a volleyball is left outside in the winter, the temperature drop can cause the air inside the ball to contract. As a result, the air pressure inside the ball decreases, causing it to lose air. This can lead to a deflated or partially deflated volleyball. It is important to note that extreme temperature changes or freezing temperatures could potentially cause damage to the ball, but the most immediate and likely effect would be the loss of air pressure.
Hence, the volleyball loose air when left outside.
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What is an example of a physical property?
Answer:
Malleability
Explanation:
Draw a cooling graph of water as it passes from 20°C to –20°C. The y-axis should be temperature in degrees Celsius and the x-axis should be time
Answer:
Kindly, see the attached image.
Explanation:
As clear in the attached image:
It represents the cooling curve of water.It starts from 20°C, the water exists in the liquid phase.With time the temperature is decreased, reaching 0°C, the two phases (liquid and solid) are co-exist.Then, with further cooling and under 0°C reaching -20°C, all the water are exist in the solid phase (Ice).Kindly, see the attached image that clarify the cooling graph of water as it passes from 20°C to –20°C.
What is critical mass?
the smallest mass of any material that can stop a chain reaction
the greatest mass of any material that can stop a chain reaction
the smallest mass of material that can sustain a chain reaction
the greatest mass of material that can sustain a chain reaction
Answer:
the smallest mass of material that can sustain a chain reaction
Explanation:
Critical mass refers to the smallest possible mass of a fissionable material that can sustain a chain reaction
Answer:
The answer is C.
Explanation:
Critical mass is the smallest mass of material that can sustain a chain reaction.
Hope this helps you, and have a nice day! :)
Which of the following elements has the highest electronegativity?
A) Chlorine
B) Florine
C) Hydrogen
D) Carbon
Answer:
B) Florine
Explanation:
Thus, fluorine is the most electronegative element.
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Identify the parts of the energy diagrams.
energy released
energy absorbed
reactants
products
HELP!!!!!!!
Energy release is exothermic reaction whiles energy absorb is endothermic reaction
Explanation:
Exothermic reaction is when the reactant is above the product while endothermic the product is below the reactant in the diagrams we have some part as activation energy
The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass.
True
False
Answer:
True
Explanation:
Fill in the coefficients that will balance the following reaction:
a0Cr2(SO4)3 + a1AgNO3 -> a2Cr(NO3)3 + a3Ag2SO4
Answer
Explanation:
can you please put it in boxes so i can find out the answer
Answer:
a0=1
a1=6
a2=2
a3=3
Explanation:
We have to start with the reaction:
[tex]Cr_2(SO_4)_3~+~AgNO_3~->~Cr(NO_3)_3~+~Ag_2SO_4[/tex]
We have to start with "[tex]Cr[/tex]". If we want to balance Cr we have to obtain 2 on both sides. Therefore we have to add a "2" on the right side, so:
[tex]Cr_2(SO_4)_3~+~AgNO_3~->~2Cr(NO_3)_3~+~Ag_2SO_4[/tex]
Then we can balance "[tex]NO_3[/tex]" as a whole. We have 6 on the right, we have to have the same amount on the left side, so:
[tex]Cr_2(SO_4)_3~+~6AgNO_3~->~2Cr(NO_3)_3~+~Ag_2SO_4[/tex]
Then we can balance "[tex]Ag[/tex]". We have 6 on the left, so we have to have the same amount on the right if we already have 2 we have to put a · in front (on the right side) to obtain in total 6, so:
[tex]Cr_2(SO_4)_3~+~6AgNO_3~->~2Cr(NO_3)_3~+~3Ag_2SO_4[/tex]
Finally, when we add this last number the [tex]SO_4[/tex] we will have 3 on both sides. Therefore the reaction is already balanced.
_____are charged atoms or groups of atoms. Compounds Ions Molecules Elements
Answer:
Ions
Explanation:
because they contain positive and negative charges
The grouped atoms with charges are called ions.
Explanation:When an atoms losses electron, then it forms positive ion or cation whereas when an atoms losses electron, then it forms negative ion or anion. The attraction between two ions leads to formation of the ionic bond.
There are many types of ions which includes monoatomic ions which contains one atoms and polyatomic ions which contains two or more atoms. When atoms are converted into ions, then the atom is undergoing ionization process.
Type the correct answer in each box.
Balance the chemical equation.
__ N203 ➡️ __ N2 +__ O2
Final answer:
To balance the chemical equation for N₂O₃ → N₂ + 3O₂, we place a coefficient of 2 in front of N₂O₃ to achieve an even number of oxygen atoms and adjust the coefficient of N₂ accordingly, resulting in the balanced equation 2N₂O₃ → 2N₂ + 3O₂.
Explanation:
To balance the chemical equation N₂O₃ → N₂ + 3O₂, we need to ensure that the number of nitrogen (N) atoms and oxygen (O) atoms on the reactant side is equal to the number on the product side. Initially, we have 2 nitrogen atoms and 3 oxygen atoms on the reactant side. On the product side, we have 2 nitrogen atoms (in N₂) and 2 oxygen atoms (in O₂).
To balance oxygen atoms, we can start by placing a coefficient of 3 in front of O₂ to get 6 oxygen atoms on the product side. Now we have:
N₂O₃ → N₂ + 3O₂However, we now have an uneven number of oxygen atoms since we have 3 molecules of O₂, which means 6 oxygen atoms on the right side, while we have only 3 oxygen atoms on the left side from the N₂O₃ molecule. Since oxygen only exists in diatomic form naturally, we must adjust the number of N₂O₃ molecules to ensure there is an even number of oxygen atoms to form O₂ molecules. Placing a coefficient of 2 in front of N₂O₃, and consequently adjusting the coefficient of N2 to maintain the balance of nitrogen, the balanced equation is:
2N₂O₃ → 2N₂ + 3O₂Explain how cells use digested food in your own words
Answer:
The digestive system uses mechanical and chemical methods to break food down into nutrient molecules that can be absorbed into the blood. ... Some animals use intracellular digestion, where food is taken into cells by phagocytosis with digestive enzymes being secreted into the phagocytic vesicles.
Explanation:
Digestion is crucial for breaking down meals into vitamins, which the frame uses for energy, growth, and cellular repair. food and drink need to be modified into smaller molecules of vitamins before the blood absorbs them and incorporates them into cells all through the frame.
What takes place in the digested meals?The small gut absorbs the maximum of the vitamins in your food, and your circulatory system passes them on to different components of your body to keep or use. Special cells help absorb vitamins across the intestinal lining into your bloodstream.
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3) In peaches, [OH]=3.16x10-11 M
a) Find [H+ ]
b) What is the pH?
c) Is the solution acidic, basic, or neutral?
Answer:
a) [H⁺] = 3.16 x 10⁻⁴ M.
b) pH = 3.5.
c) The solution is acidic.
Explanation:
a) Find [H⁺]
∵ [H⁺] [OH⁻] = 10⁻¹⁴.
∴ [H⁺] = 10⁻¹⁴/ [OH⁻] = 10⁻¹⁴/ (3.16 x 10⁻¹¹ M) = 3.16 x 10⁻⁴ M.
b) What is the pH?
∵ pH = - log[H⁺].
[H⁺] = 3.16 x 10⁻⁴ M.
∴ pH = - log(3.16 x 10⁻⁴ M) = 3.5.
c) Is the solution acidic, basic, or neutral?
We can determine the nature of the solution, acidic, basic or neutral, from the value of the pH.pH is a scale from 0 to 14.
If pH < 7, the solution is acidic.If pH = 7, the solution is neutral.If pH > 7, the solution basic.∵ pH = 3.5 < 7.
∴ The solution is acidic.
The potential energy diagram shows the gain and loss of potential energy as water molecules decompose into hydrogen and oxygen. Label the parts of the diagram
Answer:
The diagram with the five labels of the parts is in the image attached. Please, see the image.Explanation:
1) General explanation: a potential chemical energy diagram is used to show how the reactants gain energy until they reach the activation energy, form the activated complex, and release part of the energy to form the products.
The difference between the chemical potential energy of the products and the reactants is the enthalpy of the reaction:
ΔH rxn = ΔH products - ΔH reactants.The labels that correspond to each part of the diagram are explained next.
2) Reactants:
This is the substances at the start, so they appear on the left bottom side of the diagram.
3) Activation energy:
It is the energy that the reactants must reach (the highest point) in order to the reaction occurs.
4) Activated complex:
This is the intermediate state and of highest energy. The reactants have formed a complex at mid way between the reactants and the products.
5) Products:
These are the substances formed when the reaction is completed. They are lower in energy than the activated complex. They can be either higher or lower in energy than the reactants. The products are shown to the right of the diagram.
6) Enthalpy of the reaction:
The enthalpy of the reaction is the difference in energy of the products and the reactants. In this case, since, the products are higher in energy, it means that the reaction absorbed energy and it is an endothermic reaction.
The parts of the diagrams are reactants, activated complex, activation energy, enthalpy of reaction, and products.
Reactants: The leftmost point on the curve. These are the molecules before a chemical reaction occurs.Activated Complex: The peak of the curve. This is a temporary, unstable arrangement of atoms where old bonds are breaking and new bonds are forming.Activation Energy: Represented by the arrow pointing upwards from the reactants to the activated complex. This is the energy needed to form the activated complex.Enthalpy of Reaction: Shown by an arrow pointing downwards from the reactants to the products. It indicates the overall energy change in the reaction.Products: The rightmost point on the curve. These are the molecules that are formed after the reaction.In an investigation that uses the scientific method, which step immediately follows making a hypothesis?
O summarizing the results
O asking a question
O making observations
designing an experiment
Mark this and retum
Save and Exit
Next
Submit
Answer:
Designing an experiment
Explanation:
After forming a hypothesis you need to prove it, so you must design an experiment to do so.
Answer:
D) Designing an Experiment
Explanation:
After you write your hypothesis, you would design your experiment.
Summarizing results comes much later, after the experiment is already conducted.
Asking a question comes prior to the hypothesis.
Making observations comes during the experiment.
You must design the experiment before you can make observations or summarize results.
QUICK PLEASE HELP!!
Which of the following is true for a gas under conditions of very low temperature?
PV/nRT = 1. because all gases behave at ideally at very low temperatures.
PV/nRT = 1, because the actual volume of the gas molecules becomes considerable.
PV/nRT = 1, because the low temperature slows down the particles
PV/nRT = 1, because particles are unable to overcome intermolecular attractions.
Answer:
Because the particles are unable to overcome intermolecular attractions is the answers.
Explanation:
Answer: Option (d) is the correct answer.
Explanation:
It is known that gases at low pressure and high temperature behave ideally as they do not have any intermolecular forces of attraction between them.
Whereas it temperature is decreases or lowered then molecules of the gas will come closer to each other.
As a result, there will be increase in the intermolecular forces of attraction and very less or no repulsion will take place between the molecules. Hence, gas will behave non-ideally at low temperature.
Thus, we can conclude that it is true for a gas under conditions of very low temperature that PV/nRT = 1, because particles are unable to overcome intermolecular attractions.