Answer:
The density of the block is 2.827 grams/ cubic inch
Explanation:
The density of the block can be obtained by dividing the given mass of the block by its volume.
Density = mass / volume
The mass of the block given is 435.5 grams
The volume of the block can be obtained by using the formula:
Volume = Length X breadth X height
Volume = 3.5 X 8 X 5.5 = 154
There fore the density will be 435.5 / 154 = 2.827 grams/ cubic inch
Answer:
- 2Al (s) + 3Br₂ (l) → 2AlBr₃(s)
Explanation:
<u>1) Word equation:</u>
- aluminum metal + liquid bromine → aluminum bromide
<u>2) Chemical equation:</u>
- Al (s) + Br₂ (l) → AlBr₃(s)
<u>3) Balanced chemical equation:</u>
- 2Al (s) + 3Br₂ (l) → 2AlBr₃(s)
<u>4) Notes:</u>
- The most common oxidation state of aluminum is +3.
- Bromine has 5 common oxidation states: -1, +1, +3, +5, and +7.
- Since aluminum has a positive oxidation state, bromine must have the negative oxidation state, - 1.
- In the molecular formula the valences (oxidation numbers) are exchanged as subscripts, that is the reason Al has subscript 1 (understood) while Br has subscript 3.
- This is combination or synthesis reaction: two elements combine to form a new compound.
- This is a very exothermic reaction which yields light (sparks) and heat.
- The product, AlBr₃ is a molecular compound (not ionic).
Thomson's<span> model of the atom did explain some of the electrical properties of the atom due to the electrons, but failed to recognize the positive charges in the atom as particles. In 1911, Ernest Rutherford, a former student of </span>J.J. Thomson, provedThomson's<span> plum pudding structure </span>incorrect<span>.</span>
Answer:
The mixture has no fixed composition.
To form a mixture energy is neither produced nor evolved.
The mixture has no fixed melting points and boiling points.
the Mixture retains the properties of its components.
Components of mixtures can be separated by simple physical methods.