CHEMISTRY HIGH SCHOOL

A buffering solution consists of both strong acids and bases.
a. True
b. False

Answers

Answer 1
Answer: False. A buffering solution consists of a WEAK acid such as CH3COOH, C5H5N, or ammonia. A buffering solution resists pH change upon the addition of an acidic or basic components. It can neutralize little amounts of added acid or base, thus maintaining the pH of the solution relatively stable. The correct answer is letter "B. false"

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Scientists use the Celsius scale as the si unit of temperature. True or False

Answers

false, it's Kelvin. Kelvin is another form of metric units used in the si system.
false they use kelvin scale cause kelvin is the SI unit of temperature

The particles that are lost, gained, or shared in chemical reactions are

Answers

Electrons are either lost gained or shared in chemical reactions :)

Which of the following Is true about semi-conductors-neither free eletrons nor hoes are considered charge carriers in a semi-conductor
-exposing a crysal of a semiconductor to heat or light starts displacing valence electrons which then move throughout the crystal
-a material is classified as a semiconductor if its resistance to the flow of electric current is too low to permit it to be called a conductor

Answers

The statement that is true about semi conductors is this: A MATERIAL IS CLASSIFIED AS A SEMI CONDUCTOR IF ITS RESISTANCE TO THE FLOW OF ELECTRIC CURRENT IS TOO LOW TO PERMIT IT TO BE CALLED A CONDUCTOR.

Semi conductors refers to those materials that can conductor electricity only under suitable conditions, their resistance to the flow of electricity lies between that of conductors and non conductors. Semi conductors are usually used in some electric circuits because the flow of electricity through them can easily be controlled. Examples of semi conductors are silicon, germanium and selenium.

Mrs. Rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. Which combination could sheuse to produce the hydrogen she needs?

NaOH and oil

Zn and KOH

H2SO, and CaCO

0 Mg and HCI

I’ll mark your reply if the answer was correct.

Answers

Answer:

Its D

Explanation:

I took the Unit Test on Edge

Answer:

D. Mg and HCl

Calculate the number of moles
9.00 g of H2O
88.0 g of CO2
1.70 g of NH3

Answers

no. of moles -= given mass/ molar mass

1) 9 g of H2O = 9/18 = 1/2 = 0.5 mole

2) 88g of CO2 = 88/44 = 2moles

3) 1.7 g of NH3 = 1.7/17 = 0.1 mole
number of moles= mass/molar mass
1. 9 g of H2O =9/18=0.5 moles
2.88 gof CO2=88/44=2 moles
3.70 g of NH3=70/17=4.12 moles

What is true about blood alcohol concentration?

Answers

Blood alcohol concentration is the most commonly used measurement for alcohol intoxication for legal or medical purposes. It measures the amount of alcohol in the bloodstream. It is expressed in percent alcohol in blood. Hope this answers the question. Have a nice day.
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