CHEMISTRY HIGH SCHOOL

Which metal has no reaction with dilute hydrochloric acid or hydrochloric acid and forms a black oxide

Answers

Answer 1
Answer:

Answer:

lead

Explanation:

lead have no reaction with Hcl unlike aluminum,zinc, magnesium... and it forms a black oxide

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How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP?
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The part of the atom that carries a positive charge is the _____, and the part that carries a neutral charge is the _____.neutron; protonelectron; protonproton; electronproton; neutron

Cholesterol has a formula of C27H46O. What is the mass in grams of one molecule of cholesterol?

Answers

The mass in grams of one molecule of cholesterol, C27H46O is6.43×10⁻²² g

Avogadro's hypothesis

6.02×10²³ molecules = 1 mole of Cholesterol

But,

1 mole of Cholesterol = 387 g

Thus,

6.02×10²³ molecules = 387 g mole of Cholesterol

How to determine the mass of one molecule

6.02×10²³ molecules = 387 g mole of Cholesterol

1 molecule = 387 / 6.02×10²³

1 molecule = 6.43×10⁻²² g of Cholesterol

Thus, the mass of 1 molecule of cholesterol is 6.43×10⁻²² g

Learn more about Avogadro's number:

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The molar mass of cholesterol = 386.654 g/mol = 387 g/mole

3.2 mg cholesterol x 1 g/1000 mg x 1 mole/387 g x 6.02x1023 molecules/mole = 5.0x1018  molecules.

On the pH scale, a 7 indicates _____.
a base
an acid
neutrality

Answers

The correct answer is:

neutrality

on the pH scale 7 is neutral above 7 is basic and below 7 is acidic.

Explanation:

The pH is an example of how acidic/basic water is. The scale goes from 0 - 14, with 7 being neutral, pH of less than 7 designates acidity, whereas a pH of greater than 7 intimates a base. pH is really a pattern of the relative amount of free hydrogen and hydroxyl ions in the water.pH is a measure of how acidic/basic water is.

It is neutral because, at this pH, the molar concentrations of Hydroxide and Hydronium are same, therefore the substance is not a base nor an acid.

Final answer:

On the pH scale, a 7 represents neutrality. It is not considered acidic nor basic, but instead, it represents a balanced solution, such as pure water.

Explanation:

On the pH scale, a 7 indicates neutrality. This means that the solution is neither acidic nor basic. The pH scale ranges from 0 to 14, with 7 being the midpoint. Solutions with a pH less than 7 are considered acidic, while those with a pH greater than 7 are considered base or alkaline. So, a pH of 7 is indicative of a perfectly balanced solution, like pure water.

Learn more about pH scale:

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I NEED HELP!!!!Which group contains elements that are most likely to have similar properties?
A. lithium, beryllium, and boron
B. nitrogen, arsenic, and antimony
C. potassium, calcium, and gallium
D. cesium, platinum, and radon

Answers

Answer: The correct answer is option B.

Explanation:

Elements which lie in the same group most likely have similar chemical properties.

From the given options:

Option 1: Lithium, beryllium and boron.

Lithium lies in Group 1, Beryllium in group 2 and boron in Group 13. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.

Option 2: Nitrogen, arsenic and antimony

All these elements lie in Group 15 of the periodic table and hence will have the same properties.

Option 3: Potassium, calcium and Gallium

Potassium lies in Group 1, Calcium in group 2 and Gallium in Group 13. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.

Option 4: Cesium, Platinum and Radon.

Cesium lies in Group 1, Platinum in group 10 and Radon in Group 18. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.

Therefore, the correct option is Option B.
the answer would be B. Because elements in the same group have similar properties.

A substance is tested and is found to have the following physical properties: high electrical conductivity malleability high luster The substance is most likely a _____.

Answers

The substance is likely to be a metal. Many metals, such as gold, are extremely malleable (meaning that they can be pounded into thin sheets), have high conductivity due to free electrons, and are very shiny (high luster). 

Metal is most likely to be correct

Every action produces an equal and opposite -- ---------- when one object exterts a force on another object,the second object pushes back with the same amount of--------- someone knows the answer​

Answers

The answer will be Reaction, second will be force

The halogens like to bond with what other group?O Alkaline earth metals
Alkali metals
O Noble gases
O Transition metals

Answers

Halogens are most likely to bond with Alkaline Earth Metals and Alkali metals.
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A compound that contains both potassium and oxygen formed when potassium metal was burned in oxygen gas. the mass of the compound was 7.11 grams. The mass of the potassium metal was 3.91 grams. What mass of oxygen was involved in this reaction? Justify your answer.