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mart [117]
3 years ago
12

Why do all chemical changes occur

Chemistry
1 answer:
GenaCL600 [577]3 years ago
6 0

Answer:

Chemical Reactions. ... Reactions occur when two or more molecules interact and the molecules change. Bonds between atoms are broken and created to form new molecules.

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What is the formula of the ionic compound formed by the elements lithium and oxygen?
kozerog [31]
The formula is Letter A) Li2<span>O 

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3 years ago
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Rolls of foil are 300mm wide and 2.020mm thick. (The density of foil is 2.7 g/cm^3). What maximum length of foil can be made fro
horrorfan [7]

Answer:  8556 mm, or 855.6 cm (8560 mm to 3 sig figs)

Explanation:  Convert mm to cm by dividing by 10 (1cm/10mm)

Find the area of the foil face in cm^2 (30cm*0.2020cm) = 0.606 cm^2

Calculate the volume occupied by 1.40 kg of foil in cm^3.  1.40kg = 1400g

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We want Length:

Length = Volume/Area

L = (518.5 cm^3/0.606 cm^2)

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5 0
2 years ago
Which of the following would contain 48 electrons?
Helga [31]
The answer is cadmium its got 48 electrons which is y its number 48 on the period table
4 0
3 years ago
How will adding NaCl affect the freezing point of a solution?
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