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3 years ago

Claims · Evidence • Reasoning A student

1 answer:

3 0

As with the properties of a substance, the changes that substances undergo can be classified as either physical or chemical. During physical changes a substance changes its physical appearance, but not its composition. The evaporation of water is a physical change.

(I searched that up but here’s an explanation with my own words that you can use):

Change in matter can be classified as a physical change as well as a chemical change due to the properties of substance. A physical change changes substance within its appearance but not its composition. For an example: The evaporation of water is a physical change.

There you go hopefully that helped

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Which distinguishes a dwarf planet from a planet?

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It's size

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Explanation:

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3 years ago

Lithium seems to have dramatic effects on the nervous system, yet our bodies seemingly never evolved to use lithium endogenously

Flauer [41]

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<h3>What is lithium?</h3>

Lithium is a metal and a member of group 1 in the periodic table. It is a very small ion hence it has a different chemistry from the rest of the members of the group.

Lithium is not part of any of the biomolecules because given its small size and high polarizing power, it is only involved in covalent rather than ionic bonds in the body as does sodium, potassium, and calcium.

Learn more about lithium:brainly.com/question/4219437?r

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2 years ago

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the ca

MrRa [10]

Answer:

1. density = 0.89 g/cm3

2. Yes is possible to identify the liquid

3. ethanolamine

Explanation:

mass = 682 g

volume = 0.767 L = 767 mL or cm3

To calculate the density of the liquid it is necessary to know that the density formula is:

$density=\frac{mass(g)}{volume(cm^{3}) }$

The data obtained is replaced in the formula:

$density=\frac{682g)}{767(cm^{3}) }=0.89\frac{g}{cm^{3} }$

With the given data it is possible to identify the liquid, this because the density value is a basic property of each liquid.

It is possible to determine what liquid it is, since when comparing the value obtained with those reported in the collection of Material Safety Data Sheets (MSOS), the value that agrees is that of ethanolamine.

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4 years ago