On a temperature versus time graph, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?
Answers
the answer is ALWAYS THE SAME.
Answer:B
Explanation:
Related Questions
How many moles of ethyl alcohol, C2H6O, are in a 18.0 g sample?
Which substance is an Arrhenius acid
5.This ancient element symbolmeans ...A. copperB. silverc. goldD. tin
Which best describes is the ∆G, ∆H, ∆S and T of a forest fire?
Answers
Final answer:
The element with 11 protons, 11 electrons, and 12 neutrons is an Isotope of Sodium, specifically Sodium-23. The atomic number, determined by the number of protons, identifies the element.
Explanation:
The element described here, with 11 protons, 11 electrons, and 12 neutrons, is Sodium. The number of protons in an atom defines the atomic number, and thus identifies the element. In this case, the atomic number is 11, which corresponds to Sodium on the periodic table. Neutrons contribute to the mass number, but not the identity of the element. Therefore, an element with 11 protons and 12 neutrons is an isotope of Sodium. Sodium normally has 11 neutrons, but in this case, it has 12, which makes it an isotope of Sodium commonly referred to as Sodium-23.
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contact metamorphism
extrusive igneous rock
chemical sedimentary rock
Answers
The right option is; chemical sedimentary rock
Chemical sedimentary rocks are rocks that are formed by precipitation of minerals from water. Chemical sedimentary rocks are also called evaporates and they are usually composed of the minerals halite (calcium chloride) and gypsum (calcium sulfate). Examples of chemical sedimentary rocks include stalactites, stalagmites, rock salt, flint, and some dolomites.
Answer:
The correct answer is option D, chemical sedimentary rock
Explanation:
Both stalactites and stalagmites are called drip stone as they are formed of the dripping water consisting of minerals. Both stalactites and stalagmites hang up from the ceiling of caves. These are also refereed to as Chemical sedimentary rocks formed by precipitation. The three major processes involved in the formation of these two rocks are –
a) Physical weathering – which disintegrates the minerals contained in the igneous, sedimentary, or metamorphic rock
b) Chemical weathering – which involves dissolution of weathered rock minerals
c) Precipitation of the dissolved minerals.
Answers
Answer:
False
Explanation:
This property depends on the intermolecular interactions of the analyzed compound.
In most cases, this property is fulfilled, but one of the most important exceptions is water since ice cubes float in liquid water which means that its density is lower than that of liquid water.
This is due to one of the types of bonds that binds hydrogen bonds to water molecules.
Hydrogen bridges are a molecular interaction that occurs between the hydrogen in one molecule of water and the oxygen in another molecule.
Recall the formula of the density
The volume is inversely proportional to the density this means that the lower the volume the higher the density and the higher the volume the lower the density.
This type of bonding means that when the freezes there is more space between the molecules, then they occupy a larger volume
Therefore, if we have the same mass in the liquid state and the solid-state, the molecules in the liquid state will be closer together occupying less volume (higher density) and the molecules that are in the solid-state occupy a greater volume (lower density)
Answers
Answer:
2.34 %
Explanation:
Since the density of the Jello, ρ = 1.14 g/mL and ρ = m/v where m = mass of jello and v = volume of jello = 475 mL.
So, m = ρv
substituting the values of the variables into the equation, we have
m = ρv
m = 1.14 g/mL × 475 mL = 541.5 g
Since we have 13 g of sugar in the jello, the total mass present is 13 g + 541.5 g = 554.5 g
So, the percentage by mass of sugar present % m/m = mass of sugar present/total mass × 100 %
= 13 g/554.5 g × 100 %
= 0.0234 × 100 %
= 2.34 %
So, the percentage by mass of sugar present % m/m = 2.34 %
b. conservation of matter.
c. atomic disintegration.
d. definite proportions.
Answers
your answer is b. conservation of matter.
i just took the test
Answer: b. Conservation of matter.
Explanation:
Law of conservation of matter states that matter can neither be created nor destroyed by means of chemical reaction but can be changed from one form to another.
It means that the amount of matter remains the same after a chemical change.
Answers
Final answer:
A Brønsted-Lowry base is a species that accepts a proton (hydrogen ion) from another species. NH3, OH-, and even water itself are examples of Brønsted-Lowry bases, denoting they accept protons.
Explanation:
A Brønsted-Lowry base is a species that can accept a proton (a hydrogen ion) from another species. For instance, in a reaction between water and ammonia, NH3 is the Brønsted-Lowry base because it accepts a proton from water. This means that any species capable of accepting a proton, such as hydroxide ion (OH-), ammonia (NH3), or water itself can be considered a Brønsted-Lowry base.
For example, think about the dissociation of water:
H2O + H2O ⇌ H3O+ + OH-
In this reaction, water is acting as both a Brønsted-Lowry acid and a Brønsted-Lowry base. One water molecule donates a proton and becomes a hydroxide ion (the conjugate base), while the other accepts a proton to become hydronium (the conjugate acid).
Another example would be the ionization of ammonia in water:
NH3 + H2O ⇌ NH4+ + OH-
Here, ammonia (NH3) is the Brønsted-Lowry base as it accepts a proton from water to become ammonium (NH4+).
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