Which statement best describes the process that the diagrams show?
A.) A solid loses kinetic energy to become a liquid and then becomes a gas.
B.) A solid gains kinetic energy to become a liquid and then becomes a gas.
C.) A gas loses kinetic energy to become a liquid and then becomes a solid.
D.) A gas gains kinetic energy to become a liquid and then becomes a solid.
Answers
B. This looks like ice turning to water then to steam
Answer is: B.) A solid gains kinetic energy to become a liquid and then becomes a gas.
Stage 2 is melting (from solid to liquid) and Stage 2 is boiling (from liquid to gas).
In solid, molecules are closely packed, stiff and do not changes of shape or volume. Solid object does not take on the shape of its container.
Liquids have definite volume, but no fixed shape.
Gases not have definite volume and fixed shape, it depends on its container.
Related Questions
The repeating subunits that are responsible for the shape of a crystal are known as
unit cells.
heavy nuclei.
light electrons.
amorphous cells.
Answers
Answer:
The correct answer is unit cell.
Explanation:
Unit cell
Smallest unit of a crystal with fixed arrangement of atoms or ions. And this geometrical arrangement of atoms is responsible for shape of crystal and symmetry possessed by the crystal. Repetition of these unit cells in a space forms crystal.
The repeating subunits that are responsible for the shape of a crystal are
known as Unit cells.
What are Crystals?
These are solids whose components are arranged in a highly ordered
microscopic structure thereby forming lattice structure.
The unit cells known as atoms in a repeated manner are responsible for
the formation and shape of the crystal.
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Is this equation balanced and in the lowest form? 4NH3 → 2N2 + 6H2 Yes, because there are equal amounts of atoms of each element on both sides. No, because the coefficients could be reduced to 2,1, and 3. Yes, because the coefficients are in their lowest whole number ratio. No, because the coefficients could be reduced to 2, 2, and 4.
Answers
This is because the coefficients could have been reduced to 2,1&3.
Answer: The given equation is not balanced in its lowest form because the coefficients could be reduced to 2, 1 and 3.
Explanation: We are given a equation but it is not balanced in its lowest form, so to reduce it into its lowest form, we divide the whole equation by 2.
The equation becomes:
[tex]2NH_3\rightarrow N_2+3H_2[/tex]
The coefficients for the equation are 2, 1 and 3.
A structure containing at least 2 different types of tissue that work together for a common purpose is
Answers
Answer:
it is an organ it is a structure containing at least 3 different types of tissue that works together for a common purpose
Which of these redox reactions is spontaneous as written?
Pb + Fe3+ → Pb2+ + Fe
Fe + Mg2+ → Fe3+ + Mg
H2 + Al3+ → H+ + Al
Zn + Ag+ → Zn2+ + Ag
Answers
Answer:
Zn + Ag+ → Zn2+ + Ag
Explanation:
Plato
The statement of the redox reactions is spontaneous as "[tex]Zn + Ag^{+}[/tex]→ [tex]Zn^{2+} + Ag[/tex] ".
What is redox reaction?A redox reaction is the process in which electrons are exchanged between two reactants that are involved. The oxidation number of a molecule, atom, or ion varies as a result of gaining or losing an electron.
If the standard electrode potential for the redox reaction, [tex]E^{0}[/tex], is positive, the redox reaction is spontaneous. That means, the reaction will move forward if [tex]E^{0}[/tex] is positive. In this reaction, silver ion is the oxidizing agent that readily accepts the electron to attain (stable configuration) the metal state, while Zn is a reducing agent which loses electrons (i.e., oxidized) by causing a reduction. It proceeds with[tex]E^{0}[/tex] redox reaction as given, the reaction moves forward and is considered to be spontaneous.
Hence the correct answer is [tex]Zn + Ag^{+}[/tex] → [tex]Zn^{2+} + Ag[/tex].
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Drag each label to the correct category. Systems are classified as human-made or natural. Match each example to the correct type of system. solar systemtelephone systemplant root systemhuman digestive systemcity transit systemwater purification system
Answers
- solar system
- plant root system
- human digestive system
Human made
- telephone system
- city transit system
- water purification system
Explanation:
Systems which occur in the nature on their own are known as natural system. On the other hand, systems which are made by human beings are known as human-made systems.
Therefore, classifying given systems as follows.
Natural systems are:
Solar systemPlant root systemHuman digestive systemHuman-made system are:
TelephoneCity transit systemWater purification systemIn a laboratory experiment, pure lead metal reacted with excess sulfur to produce a lead sulfide compound. The following data was collected: Mass of empty evaporating dish: 25.000 g Mass of evaporating dish and lead metal: 26.927 g Mass of evaporating dish and lead sulfide: 27.485 g Solve for the empirical formula of the lead sulfide compound. Be sure to show, or explain, all of your calculations.
Answers
First, lets get the mass of each:
mass of lead = mass of evaporating dish and lead - mass of empty dish
= 26.927 - 25.000 = 1.927 gm of lead (Pb)
mass of sulfur = mass of dish and lead sulfide - mass of dish and lead
= 27.485 - 26.927 = 0.558 gm of sulfur (S)
The next step is to get the number of moles in 1.927 gm of Pb and in 0.558 gm of S:
From the periodic table:
molar mass of lead = 207.2 gm
molar mass of sulfur = 32 gm
number of moles = mass / molar mass
number of moles of Pb = 1.927 / 207.2 = 0.0093 moles
number of moles of S = 0.558 / 32 = 0.0174 moles
The third step is to get the ratio between the moles by dividing the number of moles of each by the smaller of the two:
1 mole of Pb (0.0093 / 0.0093) reacts with 0.0174 / 0.0093 = 1.99 (approximately 2 moles) of sulfur.
Final step is to write the empirical formula based on the ratio:
Lead sulfide compound is written as : PbS2
What is the [H3O+]in a solution of pOH 0.253
Answers
Answer:
1.79*10^-14
Explanation:
A quick easy way I do is find the pH which is .253-14 = -13.747
and put it as the exponent for 10.
10^-13.747=1.79*10^-14
How much heat is absorbed when 2.8 mol NH4NO3 is dissolved in water? The molar heat of solution of NH4NO3 is 25.7 kJ/mol.
Answers
Final answer:
To find the heat absorbed by the dissolution of 2.8 moles of NH4NO3, multiply the amount of substance by its molar heat of solution, yielding 71.96 kJ.
Explanation:
To calculate the amount of heat absorbed when 2.8 moles of NH4NO3 are dissolved in water, you multiply the number of moles by the molar heat of solution. The molar heat of solution for NH4NO3 is 25.7 kJ/mol.
The calculation is as follows:
Heat absorbed = Number of moles × Molar heat of solutionHeat absorbed = 2.8 mol × 25.7 kJ/molHeat absorbed = 71.96 kJTherefore, the dissolution of 2.8 moles of NH4NO3 in water absorbs 71.96 kJ of heat.
When 2.8 mol NH₄NH₃ is dissolved in water, 71.96 kJ of heat is absorbed.
To determine how much heat is absorbed when 2.8 mol NH₄NH₃ is dissolved in water, use the given molar heat of solution.
Dissolution Process:
NH₄NH₃ (s) → NH4⁺ (aq) + NO₃⁻ (aq)
The molar heat of solution for NH₄NH₃ is 25.7 kJ/mol.
Multiply the amount of NH₄NH₃ (in moles) by its molar heat of solution:Heat absorbed = 2.8 mol NH₄NH₃ × 25.7 kJ/mol = 71.96 kJHence, 71.96 kJ of heat is absorbed when 2.8 mol of NH₄NH₃ is dissolved in water.
How many moles of carbon dioxide are produced when 0.2 mol of sodium carbonate reacts with excess hydrochloric acid?
Answers
1 mol Na₂CO₃ - 1 mol CO₂
0.2 mol Na₂CO₃ - x mol CO₂
x=0.2*1/1=0.2 mol
Yes, I totally agree that the answer should be 0.2mol.
Besides，if it's not excess hydrochloric acid，the answer will be 0.2 mol，too.
What percent of the energy used produced radioactive waste
Answers
when organism convert forms of energy what usually results
Answers
a distance of one centimeter is the same as ?
a. 100m
b. 10m
c. .01m
d. 1000 m
Answers
If two cars get a 4 way stop intersection at the same time, which car should be yeiled the right of way
Answers
If two cars get a 4 way stop intersection at the same time, the car on the right should be yielded the right of way. This is known as the "right-of-way rule."
The right-of-way rule is a traffic law that determines which vehicle has the right to proceed first at an intersection.
-When two vehicles arrive at a 4-way stop intersection at the same time, the vehicle on the right has the right of way and should proceed first.
-If the two vehicles arrive at the same time and are facing each other, the vehicle going straight has the right of way over the vehicle turning left.
The right-of-way rule is important for safety reasons. It helps to prevent accidents and reduce traffic congestion by providing a clear and consistent way to determine which vehicle has the right to proceed first.
Therefore, the car on the right should be yielded the right of way.
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Tungsten is used in light bulbs because its high...
Answers
It is also used because it has the lowest vapor pressure and greatest tensile strength.
Answer:
[tex]\large \boxed{\mathrm{melting \ point}}[/tex]
Explanation:
Tungsten is used in light bulbs because its high melting point. Tungsten has a high melting point of [tex]\sf 3422 \ \°C[/tex].
Tungsten also has the lowest vapor pressure and the highest tensile strength out of all the metals.
how to calculate the formula mass of H2S2, HFO2 an keep at least one decimal place in atomic masses from the periodic table
Answers
S = 32.066
F = 18.998
O = 15.999
(1.008 x 2) + (32.066 x 2) = 66.148 g/mol
(1.008) + (18.998) + (15.999 x 2) = 52.004
Let me know if you need any further help!
The formula mass of a compound is calculated by adding the atomic masses of each atom in its formula according to their quantities. For instance, for H2S2 it's (2*1.0) + (2*32.1) equals 66.2 amu, and for HFO2 it's (1*1.0) + (1*19.0) + (2*16.0) equals 52.0 amu.
Explanation:To calculate the formula mass of H2S2 and HFO2, one must first understand the atomic masses of each element involved from the periodic table. Indeed, the formula mass is the sum of the atomic masses of each atom in the compound formula. Therefore,
For H2S2, you find the atomic masses for Hydrogen (H) and Sulfur (S). The atomic mass of hydrogen is approximately 1.0 and sulfur is around 32.1. Given the compound has 2 atoms of hydrogen and 2 atoms of sulfur, we obtain: (2*1.0) + (2*32.1) = 66.2 amu.
For HFO2, you find the atomic masses for Hydrogen (H), Fluorine (F), and Oxygen (O). Atomic mass of Hydrogen is 1.0, Fluorine is 19.0, and Oxygen is 16.0. Thus, we calculate: (1*1.0) + (1*19.0) + (2*16.0) = 52.0 amu.
Remember to keep at least one decimal place in the atomic masses during your calculations. This will improve the accuracy of your result.
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In multicellular organisms the process of cell division leads to what
Answers
Good luck in biology!
what is scientific theory?
Answers
A theory that explains scientific observation.
scientific theories must be falsifiable
If a 30-ft3 volume of air at 10 psig is compressed to 25 ft3 at a constant temperature, what would be the new pressure in psig?
Answers
Final answer:
To find the new pressure in psig, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature. The new pressure would be 12 psig.
Explanation:
To determine the new pressure in psig, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature.
Boyle's Law can be represented by the equation: P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.
Using this equation, we can rewrite it as:
P1/P2 = V2/V1
Substituting the given values into the equation, we have:
10 psig/P2 = 25 ft3/30 ft3
Solving for P2, we find:
P2 = (10 psig)(30 ft3)/25 ft3 = 12 psig
It’s laundry day at Dan’s house, so he plugs in his electric iron. What transformation of energy takes place inside the iron? The iron converts energy into energy.
Answers
In order to iron your clothes, you need heat. Once plugged in, the electric iron starts converting the electric energy it gets from the socket (plug) into the heat energy necessary to iron the clothes.
Answer: Electrical and Thermal.
Explanation:
Chemical energy in burning wood is changed into thermal energy. The thermal energy is absorbed by water, which boils to produce steam. The thermal energy is changed into kinetic energy in the moving steam. The kinetic energy is used to turn a turbine, which converts the kinetic energy into electricity. Which sentence best describes this system?
Answers
Answer:
C. It involves both energy transformation and energy transfer.
Which two particles re most similar in mass?
Answers
If scientists knew the latitude of a location on earth's surface but not the longitude what could they determine about the location?
Answers
the distance north of south of the equator .thats the answer
Which of the following metals is most reactive?
A. aluminum
B. sodium
C. copper
D. calcium
Answers
Intrusive igneous rocks _____. form from confining pressure cool quickly on Earth's surface cool slowly beneath Earth's surface form layers called foliations
Answers
Answer:cool slowly beneath Earths surface
Explanation:
Answer:
cool slowly beneath Earth's surface
Explanation:
Help please! I'd appreciate it
A sample of marble has a volume of 6 cm3 and a density of 2.76 g/cm3. What is its mass?
A - 16.56 g
B - 8.76 g
C - 2.17 g
D - 0.46 g
Answers
Answer:
16.56 g
Explanation:
Mass is the production of Volume and Density.
m = V. d = 6 × 2.76 = 16.56 g
Which of these statements best describes the relationship between matter, pure substances, and mixtures?
A. Pure substances can be divided into two groups; matter and mixtures.
B. Matter can be divided into two groups; pure substances and mixtures.
C. Mixtures and matter are two of many different types of pure substances.
D. Pure substances and matter are two of many different types of mixtures.
Answers
Hope it helps!
-DunFlowers
The answer is: B. Matter can be divided into two groups; pure substances and mixtures.
Pure substance is made of only one type of atom or only one type of molecule, it has definite and constant composition with distinct chemical properties.
For example, aluminium is an element and ammonia is compound.
Mixtures are physical combinations of pure substances that have no definite or constant composition.
A 50.0-mL sample of a 1.50 M NaOH solution is titrated with a 2.90 M HCl solution. What will be the final volume (sample + titrant) of solution when the NaOH has been completely neutralized by the HCl?
Answers
To neutralize a 50.0-mL sample of a 1.50 M NaOH solution with a 2.90 M HCl solution, you need 25.86 mL of HCl. Thus, the final volume of the solution when the NaOH has been completely neutralized by the HCl is 75.86 mL.
Explanation:First, you need to calculate the amount (moles) of NaOH in your original solution. To do this, multiply the volume of your solution (in liters) by the molarity. This yields (50.0 mL / 1000 mL/L) x 1.50 mol/L = 0.075 mol NaOH.
Next, use the balanced neutralization reaction between HCl and NaOH:
HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq)
From this reaction, we can see that one mole of HCl reacts with one mole of NaOH to produce one mole of water and one mole of sodium chloride.
Given that you have 0.075 moles of NaOH, you will need an equivalent amount of HCl for neutralization. Knowing the concentration of your HCl solution (2.9 M), calculate the volume of HCl required using the formula:
Volume = moles / molarity = 0.075 mol / 2.90 mol/L = 0.02586 L or 25.86 mL of HCl.
The final volume of the solution is ultimately the sum of the original NaOH solution volume and the volume of HCl titrant added: 50.0 mL + 25.86 mL = 75.86 mL.
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Liquid nitrogen has different properties from gaseous nitrogen. Is it a chemical change when liquid nitrogen warms to gaseous nitrogen?
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Consider the reaction 2AI(OH)3 + 3H2SO4 mc006-1.jpg X + 6Y. What are X and Y?
X = AI2(SO4)3; Y = H2O
X = AI2(SO4)3; Y = H2
X = AI2(SO3)3; Y = H2O
X = AI2(SO3)3; Y = H2
Answers
Answer is: X = Al₂(SO₄)₃; Y = H₂O.
Balanced chemical reaction:
2Al(OH)₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O.
Al(OH)₃ is aluminium hydroxide.
H₂SO₄ is sulfuric acid.
Al₂(SO₄)₃ is salt aluminium sulfate. Aluminium has oxidation number +3 and sulfate has charge -2.
H₂O is water.
Acids and bases when react (neutralisation) produce salt and water.
The value of X and Y in the equation is:
A. The value of X is Al₂(SO₄)₃
B. The value of Y is H₂O
What is a chemical equationChemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
How to determine X and YTo determine the value of X and Y, we shall write the balanced equation for the reaction. This is given below:
2Al(OH)₃ + 3H₂SO₄ → X + 6Y
Al(OH)₃ + H₂SO₄ → Al₂(SO₄)₃ + H₂O
There are 2 atoms of Al on the right side and 1 atom on the left. It can be balanced by writing 2 before Al(OH)₃ as shown below:
2Al(OH)₃ + H₂SO₄ → Al₂(SO₄)₃ + H₂O
There are a total of 8 atoms of H on the left side and 2 atoms on the right side. It can be balanced by writing 3 before H₂SO₄ and 6 before H₂O as shown below:
2Al(OH)₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O
Now, the equation is balanced.
Comparing the above balance equation with:
2Al(OH)₃ + 3H₂SO₄ → X + 6Y
The value of X and Y is:
X = Al₂(SO₄)₃Y = H₂OLearn more about chemical equation:
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The higher the percentage of the active ingredient in a drug
Answers
Basically, the higher the percentage of the active ingredient in a drug, the more quickly it will reach the blood stream.
For example, when making a tablets, the active and the inactive ingredients are mixed together to form small grains and compressed into tablets. How quickly the drug reach the bloodstream depends on the type and amount of addictive in the drug, and the degree of compression.
Further ExplanationThe drug is the active ingredients while the addictive is the inactive ingredients. The chemical substances consumed in order to produce a desired effect is the active ingredients and the addictive such as stabilizers, diluents, lubricants are mixed together with the drug so that the drugs can be swallowed easily. The inactive ingredients also help in the breaking down of the drug in the gastrointestinal tract.
Drug absorption refers to the movement of drug into the bloodstream and how quickly it will reach its intended site depends on several factors.
Some of the factors include:
the ingredients it contains (active and inactive), the drug physical and chemical properties, how the drug is stored and how it is manufactured.However, Drug dosage can be in a form of capsules, a tablet, solution or transdermal patch. It is made up of the drug and addictive.
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active ingredient in a drug https://brainly.com/question/7197859KEYWORDS:
active ingredientsinactive ingredientsdrugtabletscapsulesbloodstreamBasically, a drug will enter the blood stream more quickly the larger the amount of the active ingredient is.
What are drugs?Drugs are defined as any chemical that, when taken, alters the physiology or psychology of an organism. They might affect how your brain works, as well as your emotions, conduct, comprehension, and senses.They are therefore erratic and harmful, particularly for children. Drug effects vary depending on the user and the substance.
The active components of the drug are different from the inactive components that make it addictive. The addictive substances such as stabilizers, diluents, and lubricants are combined with the medicine to make it easier to swallow, while the active ingredients are ingested to create the intended effect. The drug's breakdown in the digestive system is also aided by the inactive components.
Thus, basically, a drug will enter the blood stream more quickly the larger the amount of the active ingredient is.
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