Answer: C. no new substances
are formed<span>
</span><span>
<span>In the
physical change of matter, there is no new substance that is formed. It is only
the appearance of the matter that is being changed and not its chemical
composition. Cutting, tearing and grinding are only some of the examples that
exhibit physical change. </span></span>
It is a compound because a compound is two or more different elements chemically combined.
Answer:
a number assigned to an element in chemical combination which represents the number of electrons lost (or gained, if the number is negative), by an atom of that element in the compound
Explanation:
sodium, magnesium, iron is zero.
Answer:
![=2.0x10^4mg](https://tex.z-dn.net/?f=%3D2.0x10%5E4mg)
Explanation:
Hello there!
In this case, when performing units conversions involving two proportional factors we need to make sure we first convert to the base unit and then to the target one; thus, since 1 kg = 1000 g and 1 g = 1000 mg, we set up the following expression:
![=0.020kg*\frac{1000g}{1kg} *\frac{1000mg}{1g} \\\\=2.0x10^4mg](https://tex.z-dn.net/?f=%3D0.020kg%2A%5Cfrac%7B1000g%7D%7B1kg%7D%20%2A%5Cfrac%7B1000mg%7D%7B1g%7D%20%5C%5C%5C%5C%3D2.0x10%5E4mg)
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