i need help with science homework?

Question

1.) Describe the makeup of pure water, and write its chemical formula?

2.) Compare and contrast mixtures and pure substances. Give an example of each.

3.) Critical thinking: David and susan are looking at a jar of honey labeled "Pure Honey". David says "That means it's natural honey, with nothing else added." Susan says, Its isn't really pure . It;s a mixture of lots of different substances." who is right? Explain your answer.
please help ,,,,,thank you so much!!

Answer 1

1) Boiling Point is 100C and Freezing Point 0C, Clear/Colorless, indefinate shape, definate volume. density=1, H2O

2)Pure Substances can never be broken down physically nor chemically, Mixtures: Two kinds Homogenous and Hetergenous, Homogenous think of gay couples they look the same ie: Milk is a Homogenous mixture. Hetergenous- Oceanwater and sand.

3)Susan is because it is most likely a mixture/compound and can be broken down into other substences. It can be seperated a number of ways ie: distillation, and filtration.

Answer 2

Well, you can't describe water has hydrogen squared, that would be incorrect. Chemistry equations are not math equations. Water is 2 molecules of hydrogen (H) for every molecule of oxygen (O), therefore the chemical equation is H2O. The "2" is written after the "H" a little bit below it, in the spot you would put a comma or period.

With regards to David and Susan: the food industry doesn't use the word "pure" the way science defines it. Pure honey means honey and nothing else. It doesn't refer to what the HONEY maybe made out of - that's irrelevant. Pure honey is honey taken from the combs and sold directly. Other processed honey has corn syrup added, some has molasses added, some has liquid sugar added. So pure honey means honey only. In this case, Dave would be right......REMEMBER YOUR QUESTION WAS LABELLED "CRITICAL THINKING"...tell that to your teacher...do not always answer these questions thinking inside the box and literally according to the lesson you just learned. Use common sense. The food industry is goverened by it own rules and standards and the word "pure" is used to signify that the ingredient labelled is the only ingredient in the product.

Answer 3

1.) Pure water is water, and only the contents that make it up, its formula is hydrogyn2 (squared) and oxygyn

2.) Mixtures are combonation of more than one pure substance and a pure substance is only one substance that was made using only its combonations.

3.) David is correct because it is only made from its natural way and form of being made!

hope i helped!

Answer 4

The truth is:
1.)h2o
2.) mixtures can be combinations of "pure" substances.
3.) Susan is correct honey has:

Minerals Amount in
100g of honey

....Calcium 4.4-9.20 mg
....Copper 0.003-0.10 mg
....Iron 0.06-1.5 mg
....Magnesium 1.2-3.50 mg
....Manganese 0.02-0.4 mg
....Phoshorus 1.9-6.30 mg
....Potassium 13.2-16.8 mg
....Sodium 0.0-7.60 mg
....Zinc 0.03-0.4 mg
Vitamins Amount in
100g of honey
....Thiamin < 0.006 mg
....Riboflavin < 0.06 mg
....Niacin < 0.36 mg
....Pantothenic acid < 0.11 mg
....Pyridoxine (B6) < 0.32 mg
....Ascorbic Acid (C) 2.2 -2.4 mg

Answer 5

look it up in ur science book were not here to do ur homework were here to help u do it