2) What evidence indicates that new substances with different properties are formed during chemical reactions?

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Q: Provide examples of physical change and chemical changes and how you could tell.

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Q: Why is tap water a homogenous mixture, whereas distilled water is a pure substance?

A: Homogeneous Mixture is a mixture in which the composition is uniform throughout the mixture.

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Q: when do sulfur and iron change their physical properties?

A: When iron and sulphur reacts, they form a compound iron sulphide (FeS)

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Q: . ___________ glass fragments into small squares, or“dices,” with little splintering when broken.

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Q: 2) What evidence indicates that new substances with different properties are formed during chemical…

A:

Q: 1.) PBr3 2.) NaCN 3.) MgBr OH 4.) H*, H20 a) b.) d) ZI

A: Detailed mechanism is given below:

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Q: All waste from a chemical experiment should be put in the same waste container    true or false?

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Q: JJ Thomson is credited with the discovery of

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Q: 1.NABH4 ? с) 2. Нао co,C2H5 1. Hg(OAc)2/THF/H2O ? d) 2. NaBH,ГОН

A:

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A: Increasing the temperature increases the average speed of the reactant molecules.

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A: Physical changes are those in which change is physical appearance takes place like smell, heat etc.…

Q: What was Dmitri Mendeleev’s major contribution to the field of chemistry?

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Q: Was there any physical change in the characteristics of trichloroethane when it was added to water?

A: Trichloroethane is micible in water. When it is added to water there is no any physical change.

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A: 1. 3% aqueous sodium chloride means there is 3g of NaCl in 100g of water.

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A:

Q: Decide whether each of the diagrams shown below is displaying qualitative or quantitative data.

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Q: A pure sample of compound X contains only carbon and oxygen in a mass ratio of 0.750 g C : 1.00 g O.…

A: A pure sample of compound X contains only carbon and oxygen in a mass ratio of 0.750 g C: 1.00 g O.…

Q: The total number of atoms in a molecule of caffeine (C8H10N4O2) is:

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A:

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Q: 8.W 8 What

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Q: What observations did Antoine Lavoisier make? What law did he formulate?

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Q: What three elements are found in chlorofluorocarbons?

A: The three elements that are found in chlorofluorocarbons has to be given.

Q: What type of distillation do we use to separate a mixture of water and acetic acid and why?

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Q: What a substance that cannot be broken into simpler substance by a chemical change.

A:

Q: Conversion If you could count individual atoms at the rate of one atom per second, about how many…

A: 1 atom = 1second  6.02* 1023 atoms = 6.02*1023 second

Q: Name the following compounds.

A: Here is the answer

Q: Nitrogen makes up what fraction of the mass of the hum Body? Nitrogen makes up what percentage of…

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Q: Think of your everyday life and look for examples of chemistry. Give a chemical formulae/reaction or…

A: Chemistry is the study of the properties and the changes of matter. Chemistry and chemical compounds…

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Q: Describe the process of separating substances by Distillation?

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