CHEMISTRY HIGH SCHOOL

What mass of sodium hydroxide is needed to make 0.500 L of 2.50 M NaOH ?

Answers

Answer 1
Answer:

Answer:

50 g NaOH

General Formulas and Concepts:

Chemistry - Solutions

  • Reading a Periodic Table
  • Using Dimensional Analysis
  • Molarity = moles of solute / liters of solution

Explanation:

Step 1: Define

0.500 L

2.50 M NaOH

x moles of solute

Step 2: Define conversions

Molar Mass of Na - 22.99 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of NaOH - 22.99 + 16.00 + 1.01 = 40 g/mol

Step 3: Find moles of solute

2.50 M NaOH = x moles NaOH / 0.500 L

x = 1.25 moles NaOH

Step 4: Convert

1.25 \ mol \ NaOH((40 \ g \ NaOH)/(1 \ mol \ NaOH) ) = 50 g NaOH

Step 5: Check

We are given 3 sig figs. Since our final answer has 2 sigs, there is no need to round.

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What is a problem commonly associated with nuclear power facilities?(1) A small quantity of energy is produced.
(2) Reaction products contribute to acid rain.
(3) It is impossible to control nuclear fission.
(4) It is difficult to dispose of wastes

Answers

The problem that is commonly associated with nuclear power facilities is "It is difficult to dispose of wastes" Option D. This is further explained below.

What are nuclear power facilities?

Generally, Nuclear power plants are simply defined as using the heat generated by nuclear fission to heat water. Atoms are torn apart in nuclear fission to generate smaller atoms.

In conclusion, nuclear power facilities have waste compounds that are hard to decompose.

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(1) False, lots of energy is actually produced from nuclear fuel, if we didn't get much then we probably wouldn't use it
(2) False, its burning coal that contributes to acid rain, since it contains sulfur
(3) False again, we can control the reaction with aptly named control rods, which are typically made of boron, to absorb some of the neutrons flying around in the chain reaction
(4) True, radioactive waste is very difficult to dispose of, and is also very dangerous. Sources of radiation can remain so for millions of years

Rob measures the solubility of three different salts in water at 22°C. Which type of graph should he use to display his data? bar graph line graph histogram scatterplot

Answers

The best graph Rob can use to show his data is a scatter plot. A scatter plot shows a relationship between two sets of data in this case the solids and their respective solubility. A scatter plot is very specific in showing how one variable is affected by another variable.

Answer:

bar graph

Explanation:

hope it helps

_____ is the element from which iron is taken.

Carbon
Quartz
Hematite

Answers

Hematite is the element
Answer:

Hematite is the element from which iron is taken.

What is the total number of electrons in a Cu+ ion?
(1) 28 (3) 30(2) 29 (4) 36

Answers

Answer: The number of electrons in Cu^+ ion is 28.

Explanation: Copper has atomic number of 29 which means it has 29 electrons and 29 protons.

Argon is the noble gas with 18 electrons.

Cu(29 -[Ar]3d^(10)4s^1

When Cu lose one electron it forms Cu^+ as now the number of protons are greater than the number of electrons.

The configuration of Cu^+ becomes [Ar]3d^(10)

The total number of electrons in a Cu+ ion is 28.

The Cu+ ion is an ion of copper with a +1 charge. The charge of the ion tells us the number of electrons gained or lost by the atom. Since the ion has a positive charge, it means that it has lost one electron.

The atomic number of copper (Cu) is 29, meaning that a neutral copper atom has 29 electrons. When a copper atom loses one electron to form the Cu+ ion, the total number of electrons in the ion is 29 - 1 = 28.

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Which of the following is the smallest volume? (2 points) 2500 mL 250 cm3
2.5 x 10-2 L
25 m3

Answers

So to put them all in the same units we have 
2500 mL 
250 mL 
25mL 
2,500,000,000mL 

So the third one is the smallest
The third is the answer becuase you multiply

In general, the solubility of ________ in water decreases as temperature increases.

Answers

Solubility of a gas in a liquid is directly proportional to the partial pressure of the gas present above the liquid and is inversely proportional to the temperature.

So, the solubility of gas in water decreases as the temperature increases.

Answer:

solubility increases

Explanation:
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