CHEMISTRY HIGH SCHOOL

A sample of a white solid contains 0.212 g of magnesium and 0.140 g oxygen. What is the empirical formula of this compound?

Answers

Answer 1
Answer:

In determining the empirical formula of a compound, you must convert the mass of each element to moles. Since the given mass for this problem is 0.212 grams of Magnesium and 0.140 grams of Oxygen, just divide the mass by the molar mass of Magnesium (24.305 g/mol) and Oxygen (16 g/mol).You’ll get 0.00872 moles of Magnesium and 0.00875 moles of Oxygen. You then divide the each mole value with the smallest calculated number of moles which is 0.00872. You will get an empirical formula of MgO. 

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True or False: Since baking soda is a powder, all the substances it breaks down intoare also powders.

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False; Sodium hydrogen carbonate (also known as sodium bicarbonate or bicarbonate of soda) has the chemical formula NaHCO3. When it is heated above about 80°C it begins to break down, forming sodium carbonate, water and carbon dioxide. This type of reaction is called a thermal decomposition.

Which of the following adaptations would you expect tofind in an animal in the alpine biome, but not in the taiga

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I think the best answer is migration. In an alpine biome, animals have two problems which is the very cold temperature and the UV rays from the sun. Most alpine animals hibernate and migrate to warmer areas of the mountains when the temperature continues to drop.

Answer:

I think the best answer is migration. In an alpine biome, animals have two problems which is the very cold temperature and the UV rays from the sun. Most alpine animals hibernate and migrate to warmer areas of the mountains when the temperature continues to drop.

A solution with a pH of 6.0 isa. acidic.
b. neutral.
c. weakly basic.
d. strongly basic.

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A solution with a pH of 6.0 is acidic. Therefore, the correct option is option A among all the given options.

pH, often known as acidity in chemistry, has historically stood for "potential of hydrogen" (as well as "power of hydrogen"). It refers to a scale used to describe how basic or how acidic an aqueous solution is. When compared to basic or alkaline solutions, acidic solutions—those with greater hydrogen (H⁺) ion concentrations—are measured with lower pH values. Acidic solutions have a pH of 6.  When the pH of a solution is below 7, it is said to be acidic, and when it is above 7, it is said to be basic (a neutral solution includes a pH of 7). A solution with a pH of 6.0 is acidic.

Therefore, the correct option is option A.

To know more about pH, here:

brainly.com/question/2288405

#SPJ6
A solution with a pH of 6 is acidic.  a solution is considered acidic when the pH<7 while a solution is considered basic when the pH>7 (a neutral solution has a pH=7).

I hope this helps.  Let me know if anything is unclear.

According to the following reaction, how many moles of carbon monoxide will be formed upon the complete reaction of 23.1 grams of benzene (C6H6) with excess oxygen gas?benzene (C6H6) (l) + oxygen (g) carbon monoxide (g) + water (g)

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The balanced chemical reaction is:

C6H6 + 9/2O2 = 6CO + 3H2O

We are given the amount of benzene to be used for the reaction. This will be the starting point for the calculations.

23.1 g C6H6 ( 1 mol C6H6 / 78.12 g C6H6 ) ( 6 mol CO / 1 mol C6H6 ) = 1.77 mol CO is produced from the reaction

if measurements of a gas are 75l and 300 kilopascals and then the gas is measured a second Time and found to be 50L describe what had to happen to the pressure

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In this problem, the ideal gas equation PV=nRT is applied. In this relationship, volume is inversely proportional to pressure. Hence, pressure increases when volume decreases, vice versa. In this case, volume is decreased from 75 to 50 L, so the pressure is expected to increase above 300 kilopascals.

What is the oxidation number of Mn in KMnO₄? a. -7
b. -3
c. 0
d. +3
e. +7

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I think the answer is e? That's if o is -2 if not it will be a
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