Which formulas represent one ionic compound and one molecular compound?

Answers

Answer 1

Answer:

ionic compounds lose or gain electrons to become stable.
ionic compounds are bonds between metals and nonmetals.

molecular or covalent compounds share one or more electrons to become stable.
molecular or covalent compounds are bonds between nonmetals.

Answer 2

Answer:

Final answer:

An example of an ionic compound is sodium chloride (NaCl). An example of a molecular compound is carbon dioxide (CO2).

Explanation:

One example of an ionic compound is sodium chloride (NaCl), where sodium (Na) is a metal that forms a positively charged ion and chlorine (Cl) is a nonmetal that forms a negatively charged ion. The formula for a molecular compound is represented by carbon dioxide (CO2), where carbon (C) and oxygen (O) atoms share electrons to form covalent bonds.

Learn more about Ionic and molecular compounds here:

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Hard water contains calcium and magnesium, which undergo oxidation andclog water pipes. Which statement best describes this change as a chemical change? A.Calcium and magnesium dissolve in water. B.Calcium and magnesium evaporate on contact with the walls of the pipe. C.Calcium and magnesium form precipitates of their respective oxides.

Explain how much risk you think your area has for water scarcity????

Answers

Not very much because half the time the water is purified but just normal water in my area probably has serious levels of scarcity.

Answer:

Explanation: Over pumping refers to pumping fresh water and reducing the level of an underground layer of water. In coastal areas, the lower underground layer of water is infiltrated with salt water, eventually increasing the salinity of the underground layer of water to the point that it is not drinkable. The scarcity of water in the coastal areas because the water in the coastal areas is not drinkable.

Bicarbonate ion is an example of aa. an acid
b. a base
c. an acidic salt
d. a basic salt
e. an amphoteric substance

Answers

It is both. We normally think of it as a base because it raises the pH of water by accepting a proton,

HCO3- + H2O <-----> H2CO3 + OH-

but if you add bicarbonate to a strongly basic solution, it actually lowers the pH by donating a proton.

HCO3- + OH- <------> CO3(2-) + H2O. That's why it is an amphoteric substance

A radioactive isotope has a half-life of 2.5 years. Which fraction of the original mass remains unchanged after 10 years?

Answers

In ten years, four half-lives have occurred (10/2.5=4). After one half-life, 50% of the original 100% remains. After two half-lives, 50% of the remaining 50% remains (so 25% remains).
After three half-lives, 50% of the 25% remains, so 12.5% remains.
After four half-lives, 50% of the 12.5% remains, so 6.25% remains.
After four half-lives, 6.25% of the original mass remains unchanged. In fraction form that is 6.25/100

Today, there are about how many people living on the earth?3.4 billion
7.5 billion
9.0 billion
6.6 billion

Answers

Answer:

The correct answer is option B, 7.5 billion

Explanation:

As per the US Census Bureau, the world population in year 2016 was approximately US

7346235000. As per the UN estimate there were 7 billion people on planet earth in 2011 and World Bank estimates say that there were 7 billion people in year 2012

The top most populated countries in coming year (along with their population) would be

China 1,367,485,388

India 1,251,695,584

United States 321,368,864

6.6 billion I got it right on Odyssey.

How many full length strands of hair are collected from the scalp to use as a sample

Answers

Answer: About (50-90) full length hair strands should be collected from the scalp to use as a sample.

Hair is a potent physical evidence, used to proof the culprit of crime. The hair analysis goes with preliminary and confirmatory analysis in forensic lab. This requires ample of sample should be available for analysis and comparison. Therefore, about (50-90) full length hair strands should be collected from the scalp to use as a sample.

Which unit is used to express the pressure of a gas?

Answers

According to the International System of Units, the unit of pressure is pascal (Pa). However, in calculating, we use atmosphere (atm), which is also a unit of pressure, more often.
Hope this helps~

The unit used to express the pressure of gas is the pascal.

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Determine the percent yield for the reaction between 46.5 g of ZnS and 13.3 g of oxygen if 18.l4 g of ZnO is recovered along with an unknown quantity of sulfur dioxide. please show work thank you