8. The chemical formula for water is H,O. What is the chemical formula for methane? a. O2 b. CO2 с. Н.о d. CH4 9. The most abundant gas in the air is, а. xenon b. oxygen c. water d. nitrogen 10. The least abundant gas in the air is, a. Xenon, Xe b. Oxygen, O2 c. Water, H20 d. Nitrogen, N2 11. 0, is , and N, is very. a. reactive, reactive

Q: 1. Platinum ( pt) a. Write the physical and chemical properties of the element above. b. Write the…

A: Please find your solution below :  a. Physical properties : Atomic number = 78 Atomic mass =…

Q: Green chemistry rests on a set of 12 principles. What are they?

A: 12 principles of green chemistry has to be given,

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Q: Explain why there are different branches of chemistry.

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Q: 9. When measuring volumes of liquid, we use graduated glassware like flasks, graduated cylinders,…

A: Graduated glasswares have a calibrated scale marked on the outside wall.

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A:

Q: 2. Identify as true (T) or false (F): | Scientific method may never prove a theory to be wrong.…

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A:

Q: can you explain what green chemistry is? I do not understand it

A: Green chemistry is also known as sustainable chemistry. Green chemistry is the design of chemical…

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A: Given that: Number of atoms in 1.0 g of Fe = 1.1 x 1022 Fe atoms

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Q: Make an introduction about Precision and Accuracy. Cite your references

A:

Q: suppose that gold is selling for $375/ounce. How many miligrams of gold could you buy for one cent?

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Q: A student determined the density of a solid to be 2.90, 2.91 and 2.93 g•cm–3. If the actual density…

A: Accuracy is the closeness of the measured value to a standard/true value. While Precision is the…

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A: molecules are made up of two or more atoms combining in a specific ratio. Pure substances are those…

Q: 4- The ideal size for a burette used in acid- base titration in which easy cleaning, maintain and…

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Q: Describe the difference between accuracy and precision. How do we determine accuracy and precision?

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A: Rules for Determination of Significant Figures:[i] All non-zero digits are significant.For example:…

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Q: Part 3: Calculate density of a metal an unknown metal. 1. Using the pictures below, record the…

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A:

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Q: (p) heterochain polymer (q) homochain polymer (r) homopolymer (s) hyperbranched polymer (t) ladder…

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A: Solution -

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Q: A quantity of substance that can be seen would be considered the A level.

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States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.