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Effectus [21]
4 years ago
14

What ion must be present for a compound to be considered a base?

Chemistry
1 answer:
Alexeev081 [22]4 years ago
4 0
It is OH- (hydroxide ion)
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How does a sample of water at 38 °C compare to a sample of water at 295 K? The water at 38 °C has a lower average kinetic energy
Drupady [299]

Answer:

The water at 38 °C has faster-moving molecules than the sample at 295 K.

Explanation:

Converting the temperature, 295 K from Kelvin to Celsius:

295 - 273 = 22°C

⇒The boiling point of water is 100°C  and its melting point 0°C

⇒When we compare water at those 2 different temperatures ( 22°C and 38°C) we can say that water is in liquid form at both these temperatures as both of them are quite below the boiling temperature and above the melting temperature.

⇒The difference in temperature between water at the 2 given  temperatures = 38°C - 22°C = 16°C

Water at 38°C is at a higher temperature and so is warmer than water at a lower temperature of 22°C.

At the atomic scale, the kinetic energy of atoms and molecules is sometimes referred to as heat energy. Kinetic energy is also related to the concept of temperature. Temperature is defined as the measure of the average speed of atoms and molecules. The higher the temperature, the faster these particles of matter move.

3 0
3 years ago
Think and infer:
galben [10]
Idk So sorry for that
5 0
4 years ago
How is it possible to have thousands of different proteins when there are only 20 different amino acids?
STatiana [176]
Hi there!

Although there are only 20 amino acids, these amino acids can combine into an innumerable amount of combinations to form different and unique proteins. 

In case that doesn't make sense to you, I'll provide you with an analogy. You could be provided with 20 different LEGO bricks to work with. While there may only be 20 bricks, these bricks can combine into a vast amount of different formations, structures, etc. Amino Acids work in the same way.
3 0
3 years ago
Naturally occurring copper is 69.15% copper-63 (atomic mass = 62.93 amu) and 30.85% of some other isotopic form of copper. what
agasfer [191]
<span>64.94 First, write out an expression about what we know 0.6915 * 62.93 + 0.3085 * x = 63.55 Now solve for x 0.6915 * 62.93 + 0.3085 * x = 63.55 43.5161 + 0.3085 * x = 63.55 0.3085 * x = 20.03391 x = 64.93972 Rounding the answer to 2 decimal places gives x = 64.94</span>
6 0
3 years ago
who reported four “element” classifications, but included some substances that were combinations of elements rather than true el
kozerog [31]
Answer: Antoine Lavoisier.

He classified the elements into four groups: elastic fluids, nonmetals, metals and earths. Some of the called elementes were not really elements (light and heat). Others were compounds, e.g. hydrochloric acid.






7 0
3 years ago
Read 2 more answers
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