Ice is nlaced in hot water What happens to the temperature of the ice and the water?
Answers
When ice is placed in hot water the hot water loses its own heat while the cold water from the ice gets heat.
Answer:when you add ice to hot water, the ice melts while the hot water cools. The exchange of heat energy from the hot water causes the ice to melt.
Explanation:
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Cuantas moléculas de oxigeno se producen por la descomposición de 28.5 g de H2O2 (masa molecular = 34.0g/mol) de acuerdo a la ecuación 2H2O2(l) → 2H2O(l)+O2(g)
Which of the following is a unit of density? = Mass / volumeA: liters per cubic gramB:cubic metersC:grams per cubic centimeterD:square meters
The diagram shows an animal cell.Which letter marks the location where carbon dioxide isproduced during respiration?WXYZ
According to the following reaction, how many moles of carbon monoxide will be formed upon the complete reaction of 23.1 grams of benzene (C6H6) with excess oxygen gas?benzene (C6H6) (l) + oxygen (g) carbon monoxide (g) + water (g)
b. element
c. molecule
d. compound
Answers
Answer:
A) Solution
Explanation:
Final answer:
A solution is not a pure substance, while elements, molecules, and compounds are examples of pure substances. The correct option is A.
Explanation:
The correct answer is a. solution. A solution is a mixture of two or more substances, so it is not a pure substance. Examples of solutions include saltwater and sugar water. On the other hand, elements, molecules, and compounds are all examples of pure substances. An element is a substance that cannot be broken down into simpler substances, such as gold or oxygen. A molecule is a combination of two or more atoms held together by chemical bonds, like water (H₂O) or carbon dioxide (CO₂). Lastly, a compound is a substance made up of two or more different elements chemically bonded together, like table salt (NaCl) or water (H₂O).
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b) form only between hydrogen and oxygen atoms within a molecule.
c) form only between a weak electronegative atom and hydrogen.
d) involve a transfer of electrons.
e) form weak interactions but can provide structural stability when many are found in a single molecule.
Answers
Answer:
Option e.
Explanation:
The option 'e' fact about Hydrogen bonds are correct, that is; ''form weak interactions but can provide structural stability when many are found in a single molecule''.
So, what is this Hydrogen bond?
Hydrogen bonds is a kind of strong dipole- dipole attractions. Hydrogen bonding occurs as a result of the bonding between hydrogen and strongly electronegative atoms for example oxygen, Fluorine and so on.
Since we now know what Hydrogen bond is, let us take a look at the options.
(a) for the first option, we can see from above meaning of Hydrogen bonds that Hydrogen bonds occur between Hydrogen and a strong Electronegative atom. So, this option is wrong.
(b). Option 'b' is also wrong Because Hydrogen bonds does not occur between hydrogen and oxygen atoms ONLY but also with other strong Electronegative atoms such as oxygen.
(c). Option 'c' is wrong because between a strong and not only between a weak electronegative atom and hydrogen.
(d). Option 'd' is also not correct.
(e). Option 'e' is correct. Hydrogen bonds contribute to the effect of boiling and melting point of substance, solubilty, dimerization, strength of bonds, shape of molecules and so on
Answers
Answer:
The substance has a density of 2.636 grams per mililiter.
Explanation:
We must remember that density (), measured in grams per mililiters, is the mass of the substance (
), measured in grams, divided by its volume (
), measured in mililiters. That is:
In addition, a kilogram equals 1000 grams and a liter equals 1000 mililiters. If we know that and
, then:
The substance has a density of 2.636 grams per mililiter.
sodium (Na) and potassium (K)
carbon (C) and oxygen (O)
boron (B) and beryllium (Be)
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Both sodium and potassium have the same number of valence electrons.
Answer:
The correct answer is the second option; sodium (Na) and potassium (K.)
Both sodium and potassium have the same number of valence electrons.
Explanation:
Answers
Answer:- A. is not the correct formula.
Explanations:- Charge for Ba is +2 and charge for O is -2, Here the charges are in equal and opposite so their ratio is 1:1 and hence the formula must be BaO and not .
Rest of the formulas are correct as charge for Ca is +2 and charge for N is -3 . On criss cross we get the formula .
Charge for K is +1 and charge for Cl is -1 and so KCl is correct.
Charge for Li is +1 and that for S is -2. On criss cross we get the formula .
Answers
carbon dioxide.
carbon monoxide.particles.
sulfur dioxide.