I believe its sublimation. An example of it could be like dry ice.
Hope that helps!
Answer : The change of phase from a solid to a gas is called sublimation.
Explanation :
Melting or fusion : It is a type of process in which the phase changes from solid state to liquid state at constant temperature.
Freezing : It is a type of process in which the phase changes from liquid state to solid state at constant temperature.
Evaporation : It is a type of process in which the phase changes from liquid state to gaseous state at constant temperature.
Condensation : It is a type of process in which the phase changes from gaseous state to liquid state at constant temperature.
Sublimation : It is a type of process in which the phase changes from solid state to gaseous state without passing through the liquid state at constant temperature.
Deposition : It is a type of process in which the phase changes from gaseous state to solid state without passing through the liquid state at constant temperature.
Hence, the change of phase from a solid to a gas is called sublimation.
What reaction would be the chemical equation 2H2O->2H2+O2 represent? A.decomposition of water b. Formation of water c. Combustion of water d. Replacement of water
Answer:
Decomposition of water
Explanation:
The chemical equation 2H₂O -> 2H₂ + O₂ shows two water molecules as reactants, and hydrogen and oxygen as products. This indicates that water is being broken down in this reaction. Another word for this is decomposition.
Formation of water would occur if the arrow was facing the other way (if hydrogen and oxygen were the reactants), however this is not the case, so formation would be incorrect.
Combustion reactions involve a substrate reacting with oxygen, usually producing heat.
Replacement of water is not occurring since the water molecules are being broken down.
One gram of __________ contains more than twice the amount of energy of a gram of glucose.
What is the total number of neutrons in the nucleus of a k-37 atom
18 neutrons
The sum of the protons' and electrons' numbers is the atomic number. Therefore, there are 19 protons and 19 electrons in potassium-37. Simply deduct the number of protons from the mass number to obtain the number of neutrons. The isotope thus has 18 neutrons.
How do you calculate the neutron count?
Neutron count = mass number - atomic mass. Example: Given that the atomic mass of boron is 11, its atomic number is 5, its number of neutrons is 11 - 5 6.
example:14 protons and 14 neutrons make up silicon. It has an atomic mass of 28 and an atomic number of 14. Uranium's most prevalent isotope has 92 protons and 146 neutrons. It has an atomic mass of 238 (92 + 146) and an atomic number of 92.
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You are trying to make balloon sculptures. You twist the balloons gently, but they keep popping. Besides trimming your nails, how could you you prevent that? Why will your strategy work?
Answer:
Fill the balloons with less air to decrease the pressure.
Explanation: This is what they ask you if you included in your answer afterward on Edge 2020
Answer:
I would simply remove some air from the balloons because with less air pressure the balloons will be less tight and more twistable without popping so by doing this it will be possible to sculpt the balloons into varied shapes successfully.
Explanation:
i think
Classify each of the statements below as pertaining to viscosity or osmolarity.
The texts provided discuss osmolarity, which impacts the volume of a cell by influencing water movement across membranes, and is related to tonicity, hypotonic, isotonic, and hypertonic solutions.
The given information pertains to osmolarity, which is the total solute concentration of a solution and is often associated with the tonicity of a solution. Osmolarity has a direct impact on the movement of water across a semipermeable membrane, where water moves from a lower osmolarity side (where there is more water) to a higher osmolarity side (where there is less water), following its concentration gradient. This process is vital for understanding how hypotonic, isotonic, and hypertonic solutions affect the volume of cells. Viscosity, while not discussed in detail here, is a property of fluids that describes resistance to flow and is determined by intermolecular forces.
How many moles of caco3 would have to be decomposed to produce 129 grams of cao?
2.3 moles CaCO₃
Explanation:Decomposition reaction is a type of reaction where a compound is broken down to smaller compounds or individual elements.For example, decomposition of calcium carbonate to yield calcium oxide and carbon dioxide.That is;
CaCO₃(s) → CaO(s) +CO₂(g)
From the question, 129 grams of CaO were formed
We are required to calculate the number of moles of CaO used.
This can be done in the following steps;
Step 1: Moles of CaO produced
The number of moles is calculated by dividing mass by the molar mass of a compound.
Molar mass of CaO is 56.0774 g/mol
Therefore;
Moles of CaO = 129 g ÷ 56.0774 g/mol
= 2.3 moles
Step 2: Moles of CaCO₃ decomposed
From the equation 1 mole of CaCO₃ decomposes to yield 1 mole of CaO
Therefore;
For 2.3 moles of CaO to be produced then 2.3 moles of CaCO₃ would be decomposed.
Therefore;
The moles of CaCO₃ decomposed is 2.3 moles
To produce 129 grams of CaO, 2.304 moles of CaCO₃ need to be decomposed.
This is calculated using the molar masses of CaCO₃ and CaO based on the balanced chemical equation.
One mole of CaCO₃ produces one mole of CaO.To determine how many moles of CaCO₃ need to be decomposed to produce 129 grams of CaO, follow these steps:
Write the balanced chemical equation: CaCO₃ → CaO + CO₂.Calculate the molar masses using atomic masses:Therefore, 2.304 moles of CaCO₃ must be decomposed to produce 129 grams of CaO.
Correct question is: How many moles of CaCO₃ would have to be decomposed to produce 129 grams of CaO ?
An element that has the electron configuration [Ne]3s23p5 is in Group
17.
2.
7.
5.
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the given electronic configuration [Ne]3s²3p⁵ belongs to group 17 of periodic table.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
The systematic distribution of electrons in the various atomic orbitals is called its electronic configuration. The given electronic configuration is [Ne]3s²3p⁵ . 1,2,3 represents the number of shells and s and represents the orbitals. The superscripts represents the number of electrons in each orbitals. There are total 7 electrons in the outermost shell of the electronic configuration, which shows the group 17 of periodic table.
Therefore, the given electronic configuration [Ne]3s²3p⁵ belongs to group 17 of periodic table.
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MATCH THE TERM WITH THE DEFINITION:
1. Weathering
2. Erosion
3. Deposition
-when rock fragments in suspension are released and help to build new geological formations
-the process by which a rock or mineral is broken down
-the movement of weathered rock particles by air, water, or ice
Stannous fluoride is formed when a tin cation with charge 4+ combines with a fluorine anion with charge 1-. How will you derive the formula for stannous fluoride?
The formula for stannous fluoride is SnF4.
The tin cation has a charge of 4+ and a fluorine anion has a charge of 1-. Using the crisscross method, we move the charge of the tin cation to the subscript position of the fluorine anion and the charge of the fluorine anion to the subscript position of the tin cation. So, we get Sn1F4. The ratio one-to-four cannot be reduced further. Since the subscript of Sn is 1, we can drop it. So the formula of stannous fluoride becomes SnF4.
Describe the energy levels of an atom and how an electron moves between them.
Cathode rays were shown to be a stream of _____. protons electrons neutrons quarks
It's B) electrons, is the right answer
Answer:
electrons
Explanation:
Write a balanced equation for the complete oxidation reaction that occurs when ethane (c2h6) burns in air. use the smallest possible integer coefficients.
In the complete oxidation reaction for ethane (C2H6) burning in air, ethane reacts with oxygen to produce water and carbon dioxide. The balanced equation for the given reaction is: 2C2H6 + 7O2 -> 6H2O + 4CO2.
Explanation:The question asks for a balanced equation for the complete oxidation reaction that occurs when ethane (C2H6) burns in air.
The initial step for any combustion reaction is to identify the reactants and products. For a hydrocarbon like ethane reacting with oxygen, the products are water (H2O) and carbon dioxide (CO2). Initially, this yield an unbalanced equation, like this:C2H6 + O2 -> H2O + CO2To balance the equation, we must ensure the same number of each type of atom appears on both sides. Tweaking the coefficients finally yields the following balanced equation:2C2H6 + 7O2 -> 6H2O + 4CO2This represents the complete oxidation reaction of ethane. Note that the coefficients in the balanced equation are the smallest possible integers, as required by the question.
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What about energy can change and what does not change, according to the law?
Energy cannot be created or destroyed, but can only change forms according to the law of conservation of energy. The total amount of energy in a closed system remains constant, even though it may convert to different forms such as kinetic or potential energy.
According to the law of conservation of energy, in any process, the total energy of the universe, or any closed system, remains constant. This means that energy cannot be created or destroyed; instead, it can only be transformed from one form to another. For instance, in a closed system, energy may shift between kinetic energy, potential energy, thermal energy, and various other forms, but the total amount of energy within that system does not change.
Consider the example of a roller coaster. As the coaster climbs a hill, it is converting the kinetic energy from the speed it has into potential energy due to its height. When the coaster comes down the hill, that potential energy is converted back into kinetic energy. Throughout these changes, the overall energy within the coaster system remains the same, illustrating the conservation of energy in a practical scenario.
It is also important to note that energy conversions are not 100% efficient, and some energy is often lost as heat due to friction or other non-conservative forces. However, this energy is not lost from the system; rather, it changes form and still obeys the conservation of energy principle.
An electrically neutral atom of oxygen has eight electrons. What other facts do you know for sure about this atom?
There are eight neutrons in the nucleus.
There are eight protons.
There is a charge of +8 on an atom of beryllium.
There is a charge of 8 on an atom of beryllium.
Answer: There are eight protons.
Explanation:
Mass number is the sum of total number of protons and neutrons present in the nucleus of an atom.
On the other hand, atomic number is only the total number of protons present in an atom.
Also, when an atom is electrically neutral in nature then its number of protons equal to the number of electrons present in it.
An electrically neutral atom of oxygen has 8 electrons and 8 protons. It can have any number of neutrons depending on the isotope of oxygen.
Thus, we can conclude that an electrically neutral atom of oxygen that has eight electrons will also have 8 protons.
A type of wood known as white pine has a density equal to 0.50 g/cm. What is the mass of a block of white pine that has the dimensions 5.0 cm by 10.0 cm by 200.0 cm ?
Elements in the same group/family of the periodic table are similar in what way?
a.they are all metals
b.they are all nonmetals
c.they have a full outer shell of electrons. eliminate
d.they have the same number of valence electrons.
Answer:
D. They have the same number of valence electrons
Explanation:
The periodic table arranges elements into rows known as periods and columns known as groups or families. Elements in the same group share similar chemical properties. Additionally, they have the same number of valence electrons. For example, elements in group I have one valence electrons while those in group II have two valence electrons.Elements in the same period share similar features such as having the same number of energy levels. For example elements in period 4 have four energy levels.Answer:
The Correct Answer is D
Explanation:
They have the same number of valence electrons.
What is the final volume of a gas that initially occupies 2.50 l at and is subsequently heated to?
Sixty-five percent of the mass of bone is a compound called hydroxyapatite. sixty-five percent of the mass of bone is a compound called hydroxyapatite.
a. True
b. False
It is true that approximately 65% of the mass of bone is hydroxyapatite, while the rest is primarily made up of collagen. Together, these components provide strength and flexibility to bones.
The statement 'Sixty-five percent of the mass of bone is a compound called hydroxyapatite.' is true. Bones in the human body are comprised primarily of a mineral known as hydroxyapatite (Ca10(PO4)6(OH)2). This mineral, making up about 65% of bone by mass, gives bones their rigidity and hardness. The remaining 35% is mostly collagen, a protein that provides some flexibility. When combined, these components enable bones to be strong without being brittle.
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Recall the postulates of kinetic molecular theory read the list and check all the statements that apply to behavior of an ideal gas
Answer:
-gas particles behave like hard spheres
-gas particles travel randomly
-average kinetic energy of a collection of gas particles depends on the temperature
answers on edg
Explanation:
Answer 1, 2, & 5
Explanation:
Is the reaction of sodium bicarbonate with hydrochloric acid endothermic or exothermic?
The reaction of sodium bicarbonate with hydrochloric acid is exothermic, meaning it releases heat. This can be felt by a warmth if touching the container where the reaction takes place.
Explanation:The reaction between sodium bicarbonate and hydrochloric acid is exothermic. This means it releases heat to the surroundings. An exothermic reaction is characterized by the release of energy in the form of heat or light. In this specific reaction, sodium bicarbonate (NaHCO3) reacts with hydrochloric acid (HCl) to produce sodium chloride (NaCl), water (H2O), and carbon dioxide (CO2) with the release of heat. As such, if you were to touch the container where the reaction is occurring, it would feel warm, which is indicative of an exothermic reaction.
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Match the element with its description. Match Term Definition Sodium A) Nonreactive gas Silicon B) Highly reactive gas Bromine C) Has properties of both metals and nonmetals Argon D) Malleable, soft, and shiny
Sodium matches with malleable, soft and shiny.
Bromine matches with highly reactive gas.
Bromine is an halogen and indeed is very reactive.
Silicon matches with has properties of both metals and nonmetals.
Silicon is a metalloid so it has some properties of metals and some of nonmetals.
Argon matches with non reactive gas.
Argon is a noble gas, and as such it is not reactive.
What is molecule?Molecule is defined as number of atoms combined together, that shows the most smaller chemical compound's fundamental unit that participate in chemical reaction. In the combination of atoms attractive forces play a vital role and it helps to bound the atoms by a chemical bond.
Liquid consist of small range of order and the reason behind this is intermolecular attractive force which is very strong and due to this reason molecules are packed together tightly. Due to presence of high kinetic energy the molecules present in the liquid move rapidly and fastly with one another.
Water is considered to be the simpler molecule and it consist of hydrogen and oxygen atom bounded together and due to the reason of high electronegativity of the oxygen's atom the bonds present are polar as well as covalent. Due to presence of high kinetic energy the molecules present in the liquid move rapidly and fastly with one another.
Therefore, Sodium matches with malleable, soft and shiny.
Bromine matches with highly reactive gas.
Bromine is an halogen and indeed is very reactive.
Silicon matches with has properties of both metals and nonmetals.
Silicon is a metalloid so it has some properties of metals and some of nonmetals.
Argon matches with non reactive gas.
Argon is a noble gas, and as such it is not reactive.
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Which statement is the best example of pseudoscience?
A. Mike joined a group that studies phrenology.
B. C.J. joined a group that studies endangered species.
C. Katarina joined a group that studies herbal remedies.
D. Lee joined a group that studies stars and planets.
The correct answer is A. Mike joined a group that studies phrenology.
Explanation:
In science, a "pseudoscience" refers to practices and believes that have been claimed scientific but have not been proved or do not follow the scientific method to be considered as real science. Because of this pseudosciences are mainly considered as invalid and are not officially recognized by science. An example of this is astrology as this states the movements of celestial bodies influence human and life and therefore can be used for prediction. Considering this, the statement that is an example of pseudoscience is "Mike joined a group that studies phrenology" because phrenology is a set of beliefs and practices that focus on measuring the skull to determine mental abilities, issues, etc but this was never proved through the scientific method and therefore nowadays is just a pseudoscience.
Ag has an anomalous electron configuration. write the observed electron configuration of ag. express your answer in complete form in order of increasing orbital energy. for example, 1s22s2 should be entered as 1s^22s^2.
In Silver, the 4d orbitals will be completely filled. That implies that it does not have two electrons in the 5s orbital. The electronic configuration of Silver is :
Ag (47) = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^1 4d^10
Ag (Silver) has the atomic number of 47 and its electron configuration becomes anomalous after 4d9. One electron from the 5s orbital jumps to the 4d, making the configuration as [Kr] 5s^1 4d^10. [Kr] represents the core electron configuration of the noble gas Kr (Krypton)
Explanation:The electron configuration of an atom dictates the layout of the atom's electrons in different energy shells available in the atom. For Ag (silver), the atomic number is 47, hence it has 47 electrons. Normally, according to the 'Aufbau Principle', the electrons fill up in order of their increasing energy levels. However, Ag is an exception.
The electron configuration for Ag follows the pattern up to 4d9, as per increase in orbital energy. But here is where it becomes anomalous. In order to gain additional stability, one electron from the 5s orbital jumps to the 4d orbital, rendering them both half-filled (which is a more stable configuration). Hence, the actual electron configuration of Ag becomes [Kr] 5s¹4d¹⁰.
Here, [Kr] signifies the electron configuration of the noble gas Kr (Krypton), which represents core electrons of 1s²2s²2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶.
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The enthalpy change when a strong acid is neutralized by strong base is -56.1 kj/mol. if 135 ml of 0.450 m hi at 23.15 °c is mixed with 145 ml of 0.500 m naoh, also at 23.15 °c, what will the maximum temperature reached by the resulting solution? [assume that there is no heat loss to the container, that the specific heat of the final solution is 4.18 j/g·c, and that the density of the final solution is that of water.]
The enthalpy change is used to calculate the energy released in the reaction, which is then used to calculate the temperature rise of the solution. The final temperature of the solution after mixing of the acid and base is found to be 30.48°C.
Explanation:The enthalpy change given is the amount of energy released or absorbed per mole of acid or base that reacts. In this case, -56.1 kJ is released each time a mole of acid and base neutralizes each other. The moles of HI and NaOH are calculated as volume * molarity, giving 0.06075 mol for HI and 0.0725 mol for NaOH.
\The neutralizing reaction will exhaust the acid completely, so 0.06075 moles of acid neutralize, releasing 0.06075 mol * -56.1 kJ/mol = -3404.675 kJ of energy. This thermal energy is absorbed by the solution, raising its temperature. Assuming the solution's volume is the sum of the volumes of acid and base, its mass (in grams) is its volume * its density, giving a mass of 280 g.
Given the specific heat capacity, the increase in temperature is calculated as heat / (mass * specific heat) giving a temperature rise of 7.33°C. The final temperature of the solution is the initial temperature plus the temperature rise, so the final temperature is 23.15°C + 7.33°C = 30.48°C.
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Write reaction equations to explain how your acetic acid-acetate buffer reacts with an acid and reacts with a base.
An acetic acid-acetate buffer system resists changes in pH upon addition of an acid or a base. The added acid reacts with the buffer's acetate ions to reduce the H+ ion concentration, while the added base reacts with the buffer's acetic acid to reduce the OH- ion concentration.
Explanation:An acetic acid-acetate buffer system includes acetic acid (CH3COOH), a weak acid, and its conjugate base, acetate (CH3COO-). When an acid is added to this buffer system, the acetate ion (CH3COO-) reacts with the acid's hydrogen ions (H+) to form acetic acid and reduce the amount of H+ ions, resisting a drop in pH. This is represented by the following reaction: CH3COO- (aq) + H+ (aq) →CH3COOH (aq).
When a base is added to the buffer system, the acetic acid (CH3COOH) donates a proton (H+) to the hydroxide ions (OH-) from the base, forming water (H2O) and acetate ions (CH3COO-), effectively resisting an increase in pH. This reaction is depicted as: CH3COOH (aq) + OH- (aq) → H2O (l) + CH3COO- (aq).
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An acetic acid-acetate buffer reacts with added acids through the weak base (acetate) and with added bases through the weak acid (acetic acid), thereby resisting changes in pH.
Explanation:An acetic acid-acetate buffer works by reacting to added acids or bases. In situations where an acid is added, the weak base (the acetate ion CH3CO₂¯) in the buffer solution will react to neutralize it as follows:
CH3CO2¯(aq) + H+(aq) → CH3CO2H(aq)
Conversely, if a base is added, the weak acid (acetic acid) part of the buffer solution will react to neutralize it as shown:
CH3CO2H(aq) + OH¯(aq) → CH3CO2¯(aq) + H2O(l)
In both cases, the buffer solution resists changes in pH by converting strong acids or bases into their weak conjugates, thereby minimizing any changes to the system's pH.
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Which of these substances are molecules?
How many grams of Cl are in 38.3 g of CHCl3?
Final answer:
There are approximately 34.16 grams of chlorine in 38.3 g of chloroform (CHCl₃), calculated by determining the molar mass of chloroform, finding the number of moles in 38.3 g, and then using the atomic mass of chlorine to find the mass of chlorine present.
Explanation:
The first step is to establish the molar mass of chloroform, which consists of 1 atom of carbon, 1 atom of hydrogen, and 3 atoms of chlorine. The atomic masses are approximately 12.01 g/mol for carbon, 1.01 g/mol for hydrogen, and 35.45 g/mol for each chlorine atom. Adding these contributions together, we find the molar mass of CHCl₃ to be:
Molar mass of CHCl₃ = 12.01 g/mol (C) + 1.01 g/mol (H) + 3 x 35.45 g/mol (Cl) = 12.01 g/mol + 1.01 g/mol + 106.35 g/mol = 119.37 g/mol.
Next, we calculate the moles of CHCl₃ in 38.3 g using the molar mass:
Moles of CHCl₃ = 38.3 g / 119.37 g/mol ≈ 0.321 moles.
Since each mole of CHCl₃ contains 3 moles of chlorine, we multiply the moles of CHCl₃ by 3 to get the moles of chlorine:
Moles of Cl = 3 x 0.321 moles ≈ 0.963 moles of Cl
Finally, to find the mass of chlorine in grams, we multiply the moles of chlorine by the atomic mass of chlorine (35.45 g/mol):
Mass of Cl = 0.963 moles x 35.45 g/mol ≈ 34.16 g of Cl.
Therefore, there are approximately 34.16 grams of chlorine in 38.3 g of CHCl₃.
Which information would be most useful to construct a model of the populations of a predator species and prey species in an area?
a. the average population size, survival rate, and amount of genetic variation of each species
b. the initial population size, reproduction rate, and survival rate of each species
c. the initial population size, reproduction rate, and amount of genetic variation of each species
d. the average population size, birth rate, and death rate of each species
Based on your observations in the virtual lab, fill in the data table below. options: A:Separated using a magnet; magnetism B:Separated using filtration; conductivity C:Separated using a magnet; malleability D:Separated using a filter; magnetism
In the given observations in the virtual lab, the part of the mixture contains iron fillings which can be easily separated by using magnet. The physical property that was used to separate the iron fillings from the mixture is magnetism. Magnetism is the property possessed by magnets to attract the metal(magnetic object) towards itself or repel the magnetic objects.
In this case, the magnetic object was iron fillings and when magnet was moved over the mixture. The iron fillings got stuck to the magnet and it was easy to separate the iron fillings from the mixture. Then only mixture was left without iron fillings.
What it the main difference between an ionic and a covalent bond?
Ionic bonds will be a metal + a nonmetal, and electrons are transferred from the metal to the nonmetal.
A covalent bond will be a nonmetal only. Nonmetals will not give up their electrons so electrons are shared.
I have also written this on the whiteboard in the image provided.