Answer:
Explanation:
Observation leads to drawing of inferences not the other way round. If no observation is made, then there is no basis of making inferences and testing them out.
Observations helps to gather facts and data through which patterns can be deduced and meaningful inferences made out. Observation is made using our five senses. Without first observing and pooling together some data, the basis of a scientific inquiry would falter along the line.
Inferences gives an arching overview to observations made. Inferences are made using prior experiences or knowledge. A times, we can notice some patterns in the data we have gathered and inferences can be made from them.
The number one is never written in the formulas for chemical compounds. true false
Answer:
true
Explanation:
usually 1 is never written as the coefficient in chemical compounds and just ignored.
I believe the answer is True
A scientist wants to use a model to help present the results of his detailed scientific investigation.
Why would a model be useful?
because the model makes the concepts easier to understand
because the model is easy to put together and to use
because the model prevents other scientists from asking questions
because the model requires the audience to pay full attention to it
Because the model makes the concepts easier to understand.
Answer:
A. because the model makes the concepts easier to understand
Edge.2023
Explanation:
<3
Identify the type of energy involved in each step:
You flip on the switch on a lamp.
The lightbulb lights up.
The lightbulb causes the lamp shade to melt.
Answer:
a. Electric Energy
b. Light Energy
c. Thermal Energy
Explanation:
a. When a lamp is turned on by means of a switch, electric energy is usually used, since that is the form of energy that is generated when there is a potential difference between two points, which allows to establish an electric current, that electric current travels through the wires up to the bulb of the lamp
b. In this case a case of light energy is presented since that is the energy transported by the light and that is manifested on the matter in different ways, one of them is to remove the electrons from the metals. This is what usually happens in some types of light bulbs, that when the displacement of the electrons is promoted, a beam of light is generated.
c. The last case is a case of thermal energy, since this energy is that expressed as the total kinetic energy resulting from the random movements of atoms and molecules. This was what could happen in case b, when the beam of light was generated. This energy is released in the form of heat, and may present high temperatures.
The study of chemicals and bonds is called chemistry. There are two types of elements and these are metals and nonmetals.
The correct answer is mentioned below.
What is energy?Energy is the quantitative property that must be transferred to a body or physical system to perform work on the body or to heat it. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed.According to the question, the energy used in the question is as follows:-
You flip on the switch on a lamp is Electric EnergyThe lightbulb lights up is Light EnergyThe lightbulb causes the lampshade to melt is Thermal EnergyHence, the correct answer to the question is mentioned above.
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What is the formula used to calculate the heat required to warm or cool one phase of matter
Answer:
SPECIFIC HEAT CAPACITY
Explanation:
Q = MC DELTA T
q = heat
c = specific heat
T = temperature ( final - initial )
The formula used to calculate the heat required to warm or cool one phase of matter is given by the specific heat capacity equation:
[tex]\[ Q = mc\Delta T \][/tex]
where:
- [tex]Q\\[/tex] is the amount of heat energy transferred,
- [tex]m[/tex] is the mass of the substance,
- [tex]c[/tex] is the specific heat capacity of the substance (the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius),
- [tex]\( \Delta T \)[/tex] is the change in temperature, calculated as the final temperature minus the initial temperature[tex](\( T_{\text{final}} - T_{\text{initial}} \)).[/tex]
This formula assumes that no phase changes occur during the heating or cooling process. If a phase change does occur (such as melting or boiling), a different formula involving the latent heat of fusion or vaporization is used. The latent heat formula is:
[tex]\[ Q = mL \][/tex]
where:
- [tex]\( L \)[/tex] is the latent heat of fusion (for melting or freezing) or latent heat of vaporization (for boiling or condensing).
In summary, to calculate the heat required to warm or cool a substance without a phase change, use the specific heat capacity equation. If a phase change is involved, use the latent heat equation.
what is matter and energy
Answer:
Matter is something that is made of atoms like a liquid, solid, or gas and energy is when water becomes a gas and the energy starts to get faster to where there is steam because the gas is being trapped inside the pot or any other object.
Explanation:
Chlorine gas react with potassium bromide. Predict the products of this reaction and their states.
Give an explanation for you answer.
can someone please explain how I get to an answer please
Answer:
See below.
Explanation:
Chlorine gas replaces the bromine in potassium bromide to form potassium chloride and bromine liquid is released.
The equation for the reaction is:
Cl2 (g) + 2KBr (s) = KCl (s) + Br2 (l).
This reaction occurs because chlorine is more reactive then bromine.
Calculate the hydrogen ion concentration for an aqueous solution that has a pH of 3.45.
Answer:
[H⁺] = 3.548 x 10⁻⁴ M.
Explanation:
∵ pH = -log[H⁺]
∴ 3.45 = -log[H⁺]
log[H⁺] = -3.45
∴ [H⁺] = 3.548 x 10⁻⁴ M.
To find the hydrogen ion concentration from a pH of 3.45, calculate 10 to the power of negative pH, resulting in a hydronium ion concentration of approximately 3.55 × 10-4 M.
Explanation:To calculate the hydrogen ion concentration for an aqueous solution with a pH of 3.45, we can use the definition of pH which is pH = -log[H3O+]. We need to reverse the process to find the concentration of hydronium ions (H3O+). This is done by taking the antilog (inverse log) of the negative pH value.
First, we reverse the sign of the pH to get -3.45. Using a calculator, we enter -3.45 and then press the 10x or exp button to find the concentration of H3O+. The result is that [H3O+] = 10-3.45 M, which calculates to approximately 3.55 × 10-4 M.
Which statement about concentration cells is correct?
A.
Concentration cells have different electrodes.
B.
Concentration cells have different solutions but with the same concentration level.
C.
Concentration cells have high voltages when the concentration levels are the same.
D.
Concentration cells have the same substance for both anode and cathode.
Answer:
Concentration cells have the same substance for both anode and cathode.
Explanation:
Plato
The correct statement about concentration cell is concentration cells have the same substance for both anode and cathode. The correct option is D.
What is anode and cathode in a cell?Anode is the negative terminal of the cell in which the electrons are released or reduced.
The cathode is the positive terminal where the electrons are accepted, here oxidation occurs.
Thus, the correct option is D. Concentration cells have the same substance for both anode and cathode.
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What’s the charge of cu3PO4
Answer:No charge
Explanation:
Cu3PO4 is an ionic compound which my definition has no charge (or a charge of 0). But if you are referring to the ions themselves that make up the compound, PO4 is a polyatomic ion so you can look up its charge in a polyatomic ion chart (it is 3-). Thus since there are 3 Cu's per PO4^3-, each Cu must have a charge of 1+.
The charge of Cu3PO4 is neutral, and each Cu ion in the molecule carries a +1 charge to balance the -3 charge from the phosphate ion.
Explanation:The compound Cu3PO4 is made up of Cu (Copper) and PO4 (Phosphate) ions. When these ions bind to form an ionic compound such as Cu3PO4, the total charge of the compound should be neutral.
The charge of Cu3(PO4)2 is +2.
In this case, phosphate has a charge of -3, and for the molecule to be neutral, the total charge from the 3 Copper ions must be +3, making the charge of each Cu (Copper) ion as +1.
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After a party, a room is known to have high entropy and thus is a good example of which law?
the zeroth law of thermodynamics
the first law of thermodynamics
the law of conservation of energy
the second law of thermodynamics
the second law of thermodynamics
Which of the following produces a physical change in the shape of an object?
Answer:Any change that occurs without altering the chemical composition of a substance is a physical change. Physical changes can include changing the color, shape, state of matter, or volume of a substance. It is crucial to remember that physical changes never alter the chemical makeup.
Explanation:
i hope that helps u try to figure it out a little bit sorry i couldn't find your answer i didn't have much to go off of
Final answer:
A physical change in the shape of an object is caused by the application of force, resulting in a deformation without altering the object's chemical composition. Examples include the melting of ice, the separating of coins, and the tearing of paper.
Explanation:
The action that produces a physical change in the shape of an object is the application of a force resulting in deformation. When a force is applied, it may cause the object to undergo squashing, squeezing, ripping, twisting, shearing, or pulling, changing the object's shape. For instance, when melting an ice cube, it undergoes a physical change as it shifts from a solid to a liquid state. Crucially, although its shape and physical properties alter, the chemical composition remains unaltered. The same applies when separating a mixture of pennies and nickels into two groups, or tearing a piece of paper; you change the configuration or the appearance but not the substance's identity. These are all examples of physical changes.
(Multiple choice) Which actions are part of the dissolution process of an ionic solute in water?
The ions are pushed together to form molecules.
Each ion is surrounded by water molecules.
The water molecules attract some ions and repel others.
The ions in the solute separate from each other.
The water molecules break apart into ions.
Answer: Each ion is surrounded by water molecules
Explanation: The ions are surround by the water molecules which act as a barrier around the ions and prevent the recombination of ions. The ions are said to be hydrated.
Answer:
Each ion is surrounded by water molecules.
Explanation:
During dissolution of ionic solute in water the following process occur
a) Breaking of molecule into separate ions (need lattice energy)
b) hydration of each ion by water molecules (hydration energy is released)
c) due to hydration the ions of solutes further become far from each other.
There is no breaking of water molecule or the ions do not combine to form molecule.
What process produces the sediments that ultimately lead to soil formation
Answer:
Option: B.
Explanation:
Weathering
Answer: weathering is your answer
Explanation:
In what zone of the ocean are thermal vents found? How are they related to organisms in this zone?
the very bottom of the ocean and they are relevant by most of the animals feed off of the animals that come out of he vents
A gas in a rigid container at 25C has a pressure of .96atm. A change in temperature causes the pressure to increase to 1.25 atm. What is the new temperature of the gas
The answer is:
The new temperature of the gas is equal to 388.22 K
Why?Since we have a rigid container, we can safely assume that the volume is kept constant.
To solve the problem, we need to use the Gay Lussac's Law, which states that the pressure and the volume of an ideal gas are proportional when the volume is kept constant.
Also, we need to remember that Gay Lussac's Law works with absolute temperature, so, we need to convert the given temperature (in celsius degrees) to Kelvin.
[tex]T(K)=273.15 + T(\°C)\\\\T(K)=273.15 +25=298.15K[/tex]
So, using the Gay Lussac's equation, we have:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
Where,
[tex]P_1[/tex] is equal to the first pressure.
[tex]T_1[/tex] is equal to the first temperature.
[tex]P_2[/tex] is equal to the new pressure.
[tex]T_2[/tex] is equal to the new temperature.
We are given the following information:
[tex]P_1=0.96atm[/tex]
[tex]T_1=298.15K[/tex]
[tex]P_2=1.25atm[/tex]
Then, substituting and calculating, we have:
[tex]T_2=P_2*\frac{T_1}{P_1}\\\\T_2=1.25atm*\frac{298.15K}{0.96atm}=388.22K[/tex]
Hence, the new temperature of the gas is equal to 388.22 K.
Have a nice day!
Answer: the person up there had the correct answers so far, but didn’t complete it, but after converting it , finish it .
temperature in celcius - 388 K - 273 = 115 °C
answer is C. 115 °C
A temperature change in a reaction indicates_____.
A temperature change in a reaction indicates a chemical change
A temperature change in a reaction indicates occurrence of chemical change.
Explanation:In chemistry, two types of reaction are always witnessed. One is physical reaction whereas the other is chemical reaction. In a chemical reaction, there is an adjustment in the organization of the substances whereas in a physical change there is a distinction in the appearance, smell, or straightforward showcase of an example of issue without an adjustment in structure.
At the point when bonds are broken and new ones are shaped, a compound change happens. The following happenings indicate the chemical change:
Change in Temperature Change in Color Recognizable Odor Development of a Precipitate or bubblesConsider this reaction:
N2 (g) + 3H2 (g) 2NH3 (g)
What will happen if more hydrogen gas is added to the reaction mixture?
A.
There will be a shift toward the products.
B.
There will be a shift toward the reactants.
C.
There will not be a shift in equilibrium.
D.
The value for Keq will change.
The answer is B :))))
If more hydrogen gas is added to the reaction mixture, there will be a shift toward the reactants. Therefore, the correct option is option B.
What is Le Chatelier's principle?Le Chatelier's principle, sometimes referred as Chatelier's concept, is indeed a chemical concept that predicts how changes in conditions would impact chemical equilibria. The idea is named for Karl Ferdinand Braun and, on occasion, French scientist Pierre Louis Le Chatelier, who independently discovered it.
When a concentration, temperature, volume, or pressure increase is applied to a simple system in thermodynamic equilibrium, it moves to a new equilibrium. The earlier alteration is somewhat cancelled out by this new equilibrium. If more hydrogen gas is added to the reaction mixture, there will be a shift toward the reactants.
Therefore, the correct option is option B.
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(08.04 MC)
Which of the following statements best predicts the pH value of NH3 and KOH?
Both have a pH less than 7, but NH3 has a higher pH than KOH.
Both have a pH greater than 7, but NH3 has a lower pH than KOH.
O NH3 has a pH less than 7, and KOH has a pH greater than 7.
O NH3 has a pH greater than 7, and KOH has a pH less than 7.
Question 2 Multiple Choice Worth 1 points)
Answer:
Both have a pH greater than 7, but NH₃ has a lower pH than KOH.
Explanation:
Both of NH₃ and KOH are bases (can produce OH⁻), so both have a pH greater than 7.NH₃ is considered as a weak base (not completely ionized), while KOH is a strong base (completely ionized).If both NH₃ an KOH has the same concentration, KOH produces OH⁻ higher than that of NH₃.So, NH₃ has a lower pH than KOH.Thus the right choice is:
Both have a pH greater than 7, but NH₃ has a lower pH than KOH.
Answer: B) Both have a pH greater than 7, but NH3 has a lower pH than KOH.
What are the missing pieces of the nuclear equation above? You will need to determine the
missing parts for this transmutation. You will need to determine what numbers should be
substituted for A and Z, and you will need to determine what should be substituted for X.
Answer:
The missing pieces of the nuclear equation are:
A = 6Z = 3X = LiExplanation:
1) Given nuclear reaction:
[tex]^9_4Be+^1_1H->^A_ZX+^4_2He[/tex]
2) A: mass number:
Balance the mass numbers of both sides of the nuclear reaction.
The mass number is the superscript to the left of the chemical symbol:
9 + 1 = A + 4 ⇒ A = 10 - 4 = 63) Z: atomic number
Balance the atomic numbers of both sides of the nuclear reaction
The atomic number is the subscript to the left of the chemical symbol:
4 + 1 = Z + 2 ⇒ Z = 5 - 2 = 34) Identity of the element.
The atomic number, which is the number of protons, identifies the unknown element: X.
You can find this information in a periodic table.
The element with atomic number 3 is lithium, and its chemical symbol is Li, hence X = Li.
Determine the volume in liters of a 1.00 ounce bottle. (1.06 qt. = 1 L; 32 ounces= 1 qt)
A 1.00-ounce bottle holds approximately 0.0295 liters of liquid, by converting ounces to quarts (1.00 ounce / 32 ounces), and then quarts to liters (the resulting number of quarts / 1.06).
Explanation:Given that there are 32 ounces in 1 quart and 1.06 quarts in 1 liter, we can first convert ounces to quarts, and then quarts to liters. So, if we have 1.00 ounce, we simply divide this number by 32 to get the equivalent in quarts. The answer is about 0.03125 quarts. Then, we convert quarts to liters by dividing the number of quarts obtained by 1.06, yielding approximately 0.0295 liters.
Thus, a 1.00-ounce bottle would hold about 0.0295 liters of liquid.
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PLEASE ITS URGENT! If some electrons are transferred from object A to object B,
A. Object A will have a positive charge
B. Object A will have a negative charge
C. Object B will have a positive charge
D. B and C
Object A will have a positive charge since it is losing electrons. And object B would have a negative charge since its gaining electrons. For example, magnesium atom is object A and chloride atom is object B. Magnesium atom gives an electron away to the chloride atom. Therefore the chloride atom will have a negative charge of one and magnesium has a positive charge of 1.
The answer is A. Object A will have a positive charge.
Neutralization of HCl and NaOH
Answer:
the reaction with the hydrochloric acid and the sodium hydroxide gives you HCl + NaOH which gives you H2O + NaCl.
Explanation:
Balance the chemical equation. Balancing the neutralization reaction involves the process of making sure that there is an equal number of moles of each of the elements on both sides of the equation.
if you supply 3600 kJ of heat, how many grams of ice at 0°C can be melted, heated to its boiling point? (Make M your X in equations) (figure out which q you need)
Answer:
=1.36kg
Explanation:
First heat is absorbed to melt the ice- latent heat of fusion of ice then heat is absorbed to raise the temperature to 373K
The specific heat capacity of water is 4.187kJ/kg/K while the latent heat of fusion of ice is 2230kJ/kg/K.
Letting the mass of the ice to be =x
x×2230kJ/kg/K + x×4.187kJ/kg/K×100K= 3600kJ
2230x+418.7x=3600
2647.8x=3600
x=1.36 kg
_______________ reactions transfer energy to the surroundings, usually as heat. A) Decomposition B) Endothermic C) Exothermic D) Synthesis
Answer: C EXOTHERMIC
Explanation:
Answer: C
Explanation:
Which is not a strong electrolyte?
Some bases
Water
Some acids
Salts
Answer:
Water
Explanation:
Strong electrolytes will completely ionize in water, and water cannot do that to itself.
which is not a strong electrolyte?
water
Which statement about concentration cells is correct?
A.
The concentrations are the same and the reactions are the same, so the cell potential is 0.00 volts.
B.
The concentrations are the same and the reactions are different, so the cell potential is greater than 0.00 volts.
C.
The concentrations are the same and the reactions are different, so the cell potential is less than 0.00 volts.
D.
The concentrations are different and the reactions are different, so the cell potential is 0.00 volts.
Final answer:
The correct statement is that in a concentration cell, the reactions are the same but the concentrations are different, which results in a cell potential greater than 0.00 volts until equilibration.
Explanation:
The correct statement about concentration cells is: The concentrations are different and the reactions are the same, so the cell potential is not 0.00 volts. Essentially, concentration cells consist of two half-cells with identical electrodes and the same redox active species at different concentrations. The standard electrode potential (E°) in a concentration cell is zero because the electrodes are identical; however, there is a potential difference, calculated with the Nernst Equation, due to varying concentrations. As the reaction in a concentration cell proceeds, the concentrations equilibrate and the cell potential (ΔEcell) decreases until the concentrations become equal and ΔEcell reaches zero.
What volume in mt, of 0.5a M1HCI solution is needed to neutralize 77 ml of 1.54 M NaOH solution?
Answer:
237.2 mL.
Explanation:
We have the rule: at neutralization, the no. of millimoles of acid is equal to the no. of millimoles of the base.(XMV) acid = (XMV) base.
where, X is the no. of (H) or (OH) reproducible in acid or base, respectively.
M is the molarity of the acid or base.
V is the volume of the acid or base.
(XMV) HCl = (XMV) NaOH.
For HCl; X = 1, M = 0.5 M, V = ??? mL.
For NaOH, X = 1, M = 1.54 M, V = 77.0 mL.
∴ V of HCl = (XMV) NaOH / (XV) HCl = (1)(1.54 M)(77.0 mL) / (1)(0.5 M) = 237.2 mL.
Can someone plz explain ionic and covalent bonding plzzzz!!!
Answer:
Ionic Bonding: The formation of an Ionic bond is the result of the transfer of one or more electrons from a metal onto a non-metal.
Covalent Bonding: Bonding between non-metals consists of two electrons shared between two atoms.
Explanation:
Which chemical equation is balanced? This is timed, please help!
Answer: It's the first one,
Calculate the number of moles of an ideal gas if it occupies 1750 dm3 under 125,000 Pa at a temperature of 127 C.
The answer is:
The number of moles (n) is 65.55 mol.
[tex]n=65.55mol[/tex]
Why?To solve the problem, we need to use the ideal gas law.
The Ideal Gas Equation is given by the following expression:
[tex]PV=nRT[/tex]
Where,
P, is the pressure in atm
V, is the volume in liters (L)
n, is the number of moles
R, is the Ideal Gas Constant
T, is the temperature in Kelvin (K)
We are given the information:
[tex]P=12500Pa\\V=1750dm^{3}\\T=127\°C[/tex]
We need to convert the given units in order to use the Ideal Gas Equation, so, converting we have:
Pressure:
We know that:
[tex]1atm=101325Pa[/tex]
So, converting we have
[tex]125000Pa*\frac{1atm}{101325Pa}=1.23atm[/tex]
Volume:
We know that:
[tex]1L=1dm^{3}[/tex]
So, we have:
[tex]1750dm^{3}=1750L[/tex]
Temperature:
We know that to convert from celsius degrees to Kelvin, we need to perform the following operation:
[tex]T(K)=T(\°C)+273.15[/tex]
So, converting we have:
[tex]T(K)=127+273.15=400.15[/tex]
Also, we have that
[tex]R=0.08205746\frac{atm.L}{mol.K}[/tex]
Now, substituting the given information into the equation to isolate "n", we have:
[tex]PV=nRT\\\\1.23atm*1750L=n*0.08205746\frac{atm.L}{mol.K}*400.15K\\\\2152.5atm.L=n*32.84\frac{atm.L}{mol}\\\\n=\frac{2152.5atm.L}{32.84atm.L}mol\\\\n=65.55mol[/tex]
Hence, we have that the number of moles (n) is 65.55 mol.
Have a nice day!
Answer:
65.81
Explanation:
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