What is the difference between an exothermic and an endothermic reaction?A. Endothermic reactions absorb heat.
B. Exothermic reactions absorb heat.
C. There are no changes in heat during either reaction.
D. Endothermic reactions release heat.
Answers
answer D
Explanation:hope thhis helped
Related Questions
Which of the following materials is not considered to be a semiconductor? germanium tin silicon aluminum
Which of the following is NOT a true statement about liquids?1. Liquids have no definite shape. 2. The boiling point of a liquid will increase with increasing atmospheric pressure. 3. The boiling point of a liquid will decrease with decreasing atmospheric pressure. 4. Liquids have no definite volume.
A substance that contains only one kind of matter is known as a(n)A. atom. B. element. C. molecule. D. compound.
What types of elements- metals,nonmetals, or metalloids requirethe most energy to remove anelectron?Why do these elements have a higher ionization energy?
Answers
**NOTE: The volume as indicated in this question is defined in L, not mL, so that conversion must be made. However it is 1000 mL = 1 L.
So now we can assign values to these variables. Let us say that the 18 M
We can then solve for
We now know that the total amount of volume of the 4.35 M solution will be 210 mL. This is assuming that the entirety of the 50 mL of 18 M is used and the rest (160 mL) of water is then added.
Answers
Solid is the low energy state of condensed matter is characterized by structural rigidity
Final answer:
The low-energy state of condensed matter characterized by structural rigidity and resistance to shape or volume changes is the solid state. This is due to its atomic structure, where molecules are organized in a rigid lattice, allowing the solid to maintain its shape and resist deformation.
Explanation:
The low-energy state of condensed matter that is characterized by structural rigidity and resistance to changes of shape or volume is defined as a solid. Going back to its atomic structure, atoms in a solid are in close contact and the forces between them allow the atoms to vibrate but not to change positions with neighbouring atoms. Basically, this atomic regulation in a solid form leads to its characteristic rigidity and resistance to shape or volume alterations.
Molecules in a solid, unlike in a liquid or gas, are organized into a lattice formation and retain this pattern despite external forces. This allows the solid state to resist deformation, maintain its shape, and have fairly constant volume. The ability of solids to resist compression is also due to their lattice structure, where atoms are at a relatively fixed distance apart, and under compression, the atoms would be forced into one another.
Learn more about Solid State here:
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Answers
Pb2+ is lead (II) ion
KI is a compound. It is a combination of potassium (K) and iodine (I). It is called potassium iodide.
Both potassium and iodine are highly reactive elements. Thus, when they are combined with another element like Pb2+, Pb2+ reacts with KI
Answer: Yes, lead ion will react with potassium iodide.
Explanation: When lead ion reacts with KI, a bright yellow colored precipitate is formed.
The reaction of these two follows:
Hence, ion reacts with KI to yield
This test is the confirmatory test for lead ion which is present in Group I.
Answers
Answer:
Explanation:
1) Increase the amount of charge on each object
2) Decrease the distance between each object
3) Increase the mass of the objects.
just colmpeated this in usa test prep 100% correct
Answers
molar mass HBr = 80.91 g/mol
number of moles = 5.0 x 10⁻⁴ / 80.91 = 6.17 x 10⁻⁶ moles
molarity = 6.17 x 10⁻⁶ / 1.2 = 5.14 x 10⁻⁶ M
HBr ------------------- H₃O⁺ + Br ⁻
↓ ↓ ↓
5.14 x 10⁻⁶ 0 0
- 5.14 x 10⁻⁶ 5.14 x 10⁻⁶ 5.14 x 10⁻⁶
_____________________________________
0 5.14 x 10⁻⁶ M 5.14 x 10⁻⁶ M
PH = - log [ H₃O⁺ ]
PH = - log [ 5.14 x 10⁻⁶ ]
PH = 5.82
slightly negative
slightly positive
Answers
Explanation
In water molecule, there are 3 atoms which belonged to 2 elements. They are 2 Hatoms and 1 O atom. Oxygen atom is more electronegative than H atom. Hence,Oxygen atom in the water molecule gets a slightly negative chargeon it.
What is electronegativity?
Electronegativity is a value that tells us how an atom can attract electronstowards itself.
It helps us to tell the nature of molecule (as polar or non-polar) and thenature of the bond between atoms (as ionic or covalent).
If the electronegativity is high, then the attraction to the electrons is highunless the attraction to the electrons is low.
If the attraction towards electrons is high, then that atom gains a negativecharge on it.
Answer:
The correct answer is: B
Explanation:
slightly negative
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