Which of the following is NOT a pure substance?a. solution
b. element
c. molecule
d. compound
Answers
Answer:
A) Solution
Explanation:
Final answer:
A solution is not a pure substance, while elements, molecules, and compounds are examples of pure substances. The correct option is A.
Explanation:
The correct answer is a. solution. A solution is a mixture of two or more substances, so it is not a pure substance. Examples of solutions include saltwater and sugar water. On the other hand, elements, molecules, and compounds are all examples of pure substances. An element is a substance that cannot be broken down into simpler substances, such as gold or oxygen. A molecule is a combination of two or more atoms held together by chemical bonds, like water (H₂O) or carbon dioxide (CO₂). Lastly, a compound is a substance made up of two or more different elements chemically bonded together, like table salt (NaCl) or water (H₂O).
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Plastics are used in almost all spheres of life for diverse purposes because of their beneficial properties. The uses of plastics include the following:
1. Plastics are used in the manufacturing of various items that we use in our homes such as television, phones, radio, vacuum cleaners, chairs, bowls plates, tables, etc.
2. Plastics are used in the food industry for packaging of foods.
3. Plastics are used in the transport industry for various purposes in the manufacture of cars, trains, aeroplanes, hydroplanes, ships, satellites, etc.
4. Plastics are also used in the medical and pharmaceutical industries for various purposes.
Manufacturers are able to use plastics for various purpose because of their properties, which include: resistance to corrosion, resistance to chemicals, low thermal conductivity, color variability, high strength to weight ratio, resistance to shock, durability, low toxicity, ready availability, cheap, etc.
Answers
Simply, multiply 2.6 by 1000 and we get 2600 cm. Converting this to scientific notation, we get the answer:
2.6 x 10^3 cm3
Final answer:
The volume of a 2.6L helium balloon, when converted to cubic centimeters or milliliters, is equal to 2,600 cm^3 or 2,600 mL. This conversion was done using the fact that 1 liter is equal to 1,000 cm^3 (or mL).
Explanation:
The volume of a helium balloon provided is 2.6 liters (L). Volumes are often converted between different units for various scientific calculations. In this case, you want to convert from liters to cubic centimeters (cm^3 or mL). The conversion factor is 1 L = 1,000 cm^3 (or mL). To convert, you simply multiply the volume in liters by 1,000.
So, 2.6 liters * 1,000 cm^3/L = 2,600 cm^3. Thus, the volume of the helium balloon is 2,600 cm^3 or 2,600 mL.
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(3) location of an electron
(4) mass of an electron
Answers
In the electron cloud model of the atom, an orbital is defined as the most probable location of an electron. Hence, option 3 is the correct answer.
What is an atomic orbital?
An atomic orbital is a mathematical term in atomic theory and quantummechanics that describes the position and wavelike behaviour of an electron in an atom.
An electron cloud is the region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital.
It is defined mathematically, describing a region with a high probability of containing electrons.
Hence, option 3 is the correct answer.
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The correct answer would be 3.) Location of an electron
Answers
-Democritus' ideas were not supported by evidence.
-Dalton's theory was the first scientific theory because it relied on scientific investigative processes.
-Dalton's theory was supported by evidence and repeated investigation
sulfur
anitmony
selenium
Answers
Answer: Option (a) is the correct answer.
Explanation:
Electric current is the flow of electrons and an atom that has free electrons will be able to carry current easily.
Hence, electronic configurations of the given elements are as follows.
Tin (Sn) -
Sulfur (S) -
Antimony (Sb) -
Selenium (Se) -
So, sulfur and selenium being non-metals won't be able to conduct electricity. Whereas both tin and antimony are poor metals but they are able to conduct electricity.
Antimony has half filled p-shell so, it will not lose its valence electrons as it is stable. Whereas tin will easily lose its valence electrons to become stable.
Thus, we can conclude that tin is the element that is most likely to carry electric current easily.