1) Endothermic reactions:
a) The reaction between ammonium nitrate and water absorbs heat from the surrounding environment.
There are two types of reaction: endothermic reaction (chemical reaction that absorbs more energy than it releases) and exothermic reaction (chemical reaction that releases more energy than it absorbs).
b) Ammonium chloride dissolved in a beaker of water makes the beaker cold.
Dissolving this salt absorbs heat from beaker.
c) Water separates on hydrogen and oxygen when an electric current is run through it.
Electrolysis of water is the decomposition reaction (heat is required), because from one molecule (water) two molecules (hydrogen and oxygen) are produced. Water is separated into two molecules.
2) Exothermic reactions:
a) Three drops of concetrated sulfuric acid added to 100 milliliters in a beaker makes the beaker hot.
Energy is released, beaker absorbs that heat.
b) Uranium atoms are split to produce nuclear energy.
Nuclear energy is released.
c) Methane and oxygen are combined to produce methanol and heat.
Balanced chemical reaction: 2CH₄ + O₂ → 2CH₃OH + heat.
Answer:
Al has a 3+ charge, and SO4 has a 2- charge. So, it takes 3 of the SO4 anions to balance 2 of the Al cations. So, you get Al2(SO4)3
First let us see what
kind of bonds are formed in the compound. By drawing the structure, we see that
the kind of bonds are:
N =- triple bond -= C –
O
<span>So there is only
single bond between C and O therefore the hybridization of C is sp.</span>
Na: 22.99 grams; H: 1.008 grams; P: 30.97 grams; 0: 16.00 grams
The molar mass of sodium phosphate (Na2HPO4) would be equal to:
(2 x 22.99) + 1.008 + 30.97 + (4 x 16) = 141.96 grams/mole
Calculation for sodium phosphate dihydrate (NaH2PO4 2H20) the same way as above:
22.99 + (2 x 1.008) + 30.97 + (4 x 16) + (4 x 1.008) + (2 x 16) would equal 156.01 grams/mole
Hope this helped! If not, then at least I tried. I think you put like terms together for the 1Li + 5B + 9Br thing, but I am not 100% sure.
2 x 22.99 + 4 x 16 = 8 x 367.84 = 2,942.72 (2,943)
22.99 + 30.97 = 53.96 (54Li Maybe?)
2 x 1.008 + 4 x 1.008 = 8 x 2.016 = 9.008 (9B Maybe?)
4 x 16 + 2 x 16 = 8 x 256 = 2,048 (2,000Br Maybe?)
Not 100% sure. At least I tried. I am not that good at math, but I tried the absolute best I could on paper to get this answer.
A. Combination of more that one kind of substance
Explanation:
A mixture in chemistry is an impure material made up of more than one kind of substance. By substance we refer to compounds and elements.
They have the following properties:
- Their composition is indefinite
- Their constituents retains their identities
- Their constituents reacts differently to changed conditions.
- They can easily be separated by physical methods.
Learn more:
Mixtures brainly.com/question/1446244
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