CHEMISTRY HIGH SCHOOL

Hich element is likely to be the most brittle?a. selenium
b. cobalt
c. platinum
d. zinc

Answers

Answer 1
Answer:

Answer:

a. Selenium

Explanation:

Hello,

Selenium is a crystalline non-metallic element that has variable properties depending on how it is prepared, but they are all hard solids. Zinc is less brittle than selenium since it has stronger metallic properties. On the other hand, cobalt and platinum are strong metals that are far away to be brittle.

Best regards.
Answer 2
Answer: The most brittle one is selenium!

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In what way would readings from a digital thermometer be preferable to those from a liquid-based thermometer?

Answers

A digital thermometer is more preferable than a liquid-based thermometer because it gives accurate data than the liquid thermometer. Liquid thermometer is affected by the temperature, and when it does, the liquid expands and so des the material covering the thermometer. For the digital thermometer, it has less error because it already has a sensor inside it that determines the temperature of the substance.

Which compound reacts with an acid to produce water and a salt(1) CH3Cl
(2) CH3COOH
(3)KCl
(3)KOH

Answers

KOH is the only base, and any neutralization reaction produces a salt and water
I'm not exactly sure which one but I do know that an acid and a base react in a aqueous solution to form water, so i would probably eliminate the ones that aren't aqueous solutions.

Which of the following metal atoms would have the highest conductivity?A.the atom with the smallest radius and the fewest valence electrons
B.the atom with the smallest radius and the most valence electrons
C.the atom with the largest radius and the fewest valence electrons
D.the atom with the largest radius and the most valence electrons

Answers

Answer: Option (d) is the correct answer.

Explanation:

A metal which has the largest size and the most valence electrons would have the highest conductivity because the larger is the size of a metal the more freely electrons can move in it. Hence, the metal can conduct electricity.

If the atom is smaller in size then the electrons will be tightly held around the nucleus and hence they won't be able to move freely. Therefore, they will not conduct electricity.

Thus, we can conclude that the atom with the largest radius and the most valence electrons would have the highest conductivity.

Answer:

D. the atom with the largest radius and the most valence electrons

Explanation:

The involuntary muscles of the arteries are controlled by the_________ system. respiratory,skeletal,nervous,circulaory

Answers

The involuntary muscles of the arteries are controlled by the nervous system. The correct option among all the options that are given in the question is the third option or the penultimate option. these muscles are not directly under the control of any person and so are called involuntary muscles. I hope the answer helps you.

Answer:

nervous system

Explanation:

Have a good day!!

Everything on earth is made of

Answers

- - Everything on earth is made of matter.Matter is all around you, everything you see and touch is matter. 
Everything is made out of matter. More specifically atoms.

20 g of sugar is stirred into a beaker containing 100 g of water. After the sugar has completely dissolved, the solution is put on a scale. What is the mass of the solution?

Answers

The mass of the solution of sugar and water is 120 grams.

What is mass?

Mass is the quantity of matter of a physical body.

The mass of the sugar is given is 20g

The mass of the water is 100 g.

100 + 20 = 120 gram

Thus, the mass of the solution of sugar and water is 120 grams.

Learn more about mass

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The mass of the solution should be 120g since 20g of sugar were added to 100g and 100+20=120.
I hope this helps.  Let me know in the comments if anything is unclear.  
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