CHEMISTRY HIGH SCHOOL

The hardest known mineral is _____.
topaz
talc
diamond
graphite

Answers

Answer 1

Answer: The hardest known mineral is diamond.

Answer 2

Answer:

Hi there, thanks for asking a question here on Brainly!

The hardest known mineral in this planet is the diamond.

Answer: Letter C ✅

Hope that helps! ★

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When farmers irrigate their crops, as much as 60 to 70 percent of the water _____. is ruined by pests, such as rabbits that are around the crops never reaches the crop is taken up by the plant is already contaminated by lead pipes
Which atomic model was proposed as a result of J. J. Thomson’s work?
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True or false. Nitrogen is extremely important for good crops?

Answers

Answer:

True

Explanation:

Without enough nitrogen there is not enough nutrients for plants to make both aminoacids and many products of secondary metabolism

What increases the salinity of the ocean surface water, causing it to sinkdownward?
Help

Answers

Answer:

Thermohaline Circulation

Explanation:

The process is known as “Thermohaline Circulation”. In the Earth’s polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink.

ENRICHMENT WORKSHEET INTEGRATING Jesse Owens in the 100 Meter Dash Read the following paragraph and complete the exercises below. Jesse Owens was an outstanding American athlete who held or shared several world records in track and field. He won four gold medals at the 1936 Olympic Games in Berlin, Germany. One of these medals was for the 100 m dash, in which Owens tied the Olympic record with a time of 10.3 s. Exercises 1. Using the data in the first two columns of the table below, plot a graph of distance versus time for a sprinter in the 100 m dash. Timeout distance I Average speed A0/55 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 100 4 10 18 27 37 48 59 71 83 96 100 Distance (m) 100 90 80 70 60 50 40 30 20 MATHEMATICS 10- 0 AS 0 1 2 3 4 5 6 7 8 9 10 Time (s) ÷ 2. Look at the graph, and identify the point where the graph appears to have the steepest slope. Describe what this tells you about the motion of the sprinter.

Answers

Answer:

Therefore, the steepest slope in the graph indicates that the sprinter is experiencing a rapid increase in speed during the early stages of the race. This suggests that Jesse Owens had a powerful start and was able to accelerate quickly in the 100m dash.

Explanation:

Based on the graph provided, the point where the graph appears to have the steepest slope is around the 2-second mark.

The steep slope in the graph represents the sprinter's acceleration during the initial phase of the race. In the 100m dash, sprinters aim to reach their top speed as quickly as possible. The steeper the slope, the faster the sprinter is accelerating.

Which object is more dense?!

Answers

Object B

Explanation:

Another word or phrase for moon

Answers

scientific name is satellite i think..

A weak acid, HA, has a pKapKa of 4.3574.357 . If a solution of this acid has a pH of 4.0054.005 , what percentage of the acid is not ionized? Assume all H+H+ in the solution came from the ionization of HA.

Answers

Answer:

69.3%

Explanation:

The question should read as follows:

A weak acid, HA, has a pKa of 4.357. If a solution of this acid has a pH of 4.005, what percentage of the acid is not ionized? Assume all H⁺ in the solution came from the ionization of HA.

The Henderson-Hasselbalch equation relates the pKa and pH of a solution to the ratio of ionized (A⁻) and unionized (HA) forms of a weak acid:

pH = pKa + log ([A⁻]/[HA])

Substituting and solving for [A⁻]/[HA]:

4.005 = 4.3574 = log([A⁻]/[HA])

-0.3524 = log([A⁻]/[HA])

[A⁻]/[HA] = 0.444/1

The percentage of acid that is not ionized (i.e. the percentage of acid in the HA form) is calculated:

[HA]/([A⁻] + [HA]) x 100% = 1/(1+0.444) x 100% = 69.3%

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All the elements of a family in the periodic table have what feature in common? A) They all have similar chemical properties. B) They all have the same number of protons in the nucleus. C) They are all located in the same horizontal row or period. Eliminate D) They all have the same number of electrons in the electron cloud.

Hydrocarbons are separated from each other by a process called cracking distillation. a. True b. False