Energy conversion can alter the state of matter by the release or absorption of energy. The snow on the driveway absorbed radiant energy to produce a physical change. Thus, option D is correct.
A physical change is a temporary change that is for a shorter duration of time and has been reversible as now new substance formation takes place. Instead, the old substance undergoes a change in the state of matter.
Snow is a solid state that absorbs radiant heat from the sun to get converted into water by melting. The melting of snow is a physical change as the state of matter gets altered by the absorption of energy. No chemical composition or properties were altered.
Therefore, option D. the melting of snow is a physical change.
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Answer:
The snow absorbed radiant energy to produce a physical change.
Explanation:
Here's the answer, I remember doing this problem last year.
23.5 degrees north, 77 degrees west
Answer:
D & E
Explanation:
I think this is dealing with latent heat and D & E would be the range where you will find solid and liquid phases in equilibrium, cuz it starts as gas at from A to B, B to C is gas and liquid equilibrium, C to D is liquid, D to E solid and liquid, and then E to F is solid.
A pharmaceutical percolator is a device used to extract active compounds from plants or herbs. It works by passing a solvent through the material to dissolve the desired components. The process involves maceration, percolation, and filtration.
A pharmaceutical percolator is a device used in the pharmaceutical industry to extract active compounds from plants or herbs. It works on the principle of percolation, which involves passing a solvent through a solid material to dissolve the desired components. The percolation process involves three main steps:
The stability of an atom is affected by the balance between the electrons, protons, and neutrons in an atom.
A particle less than an atom is referred to as a subatomic particle. A subatomic particle can either be an elementary particle, which is not made of other particles, or a composite particle, which is composed of other particles, according to the Standard Model of particle physics.
Particles smaller than an atom are referred to as subatomic particles. The three primary subatomic particles present in an atom are protons, neutrons, and electrons.
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Answer:
Tinitial = 78.6°C
Explanation:
In a calorimetry experiment, the flow heat is measured for a system that has a state change. In this case, there isn't happening a physical change, so the heat is called sensitive heat, and it's calculated by:
q = mxCpxΔT
Where q is the heat, m is the mass, Cp is the specific heat and ΔT is the difference of final and initial temperature (Tfinal - Tinitial).
Copper is losing heat, so q is negative, then:
-1860 = 92x0.377x(25 - Ti)
34.684(25 - Ti) = -1860
25 - Ti = -53.63
-Ti = -78.63
Ti = 78.6ºC
1) K+ and H+ and PO43-
6
2) K 2+ H+, and PO43-
9
3) K+, H+, p3-, and O2-
4) K2H3+ and PO43-
5) K2HPO4 is not ionic.
Answer:
K⁺ and HPO₄²⁻ ions are present in K₂HPO₄
Explanation:
K₂HPO₄ consist of anion and cation such as HPO₄²⁻ and K⁺. We can see that the charge on HPO₄²⁻ is negative 2. Thus inroder to balance the charge and to neutral the compound two potassium ions are attached because the charge on one atom of potassium is K⁺.
Properties of K₂HPO₄ :
It is salt of phosphoric acid.
Its density is 2.44 g/cm³.
It is odourless compound.
It is white powder and soluble in water.
It is used in fertilizer because it provide phosphorus which is beneficial for the growth of plants.
It is also used as a additive in food.
It is inorganic compound and also used as buffering agent.
The correct ions present in K2HPO4 are K+, H+, and PO43-. Here, potassium (K+) ions, hydrogen (H+) ion and phosphate (PO43-) ion are released.
The compound K2HPO4 dissociates in water to form ions. The correct answer from your selection would be the first one. When K2HPO4 is added to water, it dissociates into its ions 'K+' (Potassium), 'H+' (Hydrogen) and 'PO43-' (Phosphate). So, the ions present in K2HPO4 are K+, H+ and PO43-. Please note that K2HPO4 is also called dipotassium hydrogen phosphate.
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