Question -   My 8 year old son has done a science fair project
entitled "Does an Ice Cube Melt Faster in Fresh Water or Salt Water?".We
have done the experiment several times and have concluded that an ice
cube melts faster in fresh water. Can you help me explain the
experiments results,so an 8 year old … Read more

It is the purchase of items by going to some website, say Amazon.com. You have to give them some form of payment information so chose wisely where you buy things. You should have some sort of security program running at all time. At least antivirus but much more to be safest.

One use is CO2 in the form or dry ice. You can get this at Publix, etc. It is solid CO2 and goes directly from solid to gas as it is used to cool down food, etc.

Not Highly reactive but reactive. NaHCO3 is a weak base and vinegar has acetic acid in it. Combine the two and you get CO2 gas, water and Sodium Acetate and some heat. Going from memory here but pretty sure. Wear your safety googles.

This question highlights the problem with religion nicely. If this going to heaven concept were real, where do all the poor souls go that were never exposed to Christianity in the first place? Where did all those go before Christ was born? If life begins at conception, where does the soul of a still born … Read more

2/3 means 2 divided by 3. Doing this long hand or on a calculator you get 0.66666666666. 2/3 of something though is roughly 66.6% of it.

[I knew someone already answered this so just searched it and posted here, good luck.] What Are Two Physical Properties Of Sulfur? Following are the two physical properties of Sulphur: - It is a yellow crystalline solid - Sulfur is a soft bright yellow solid at room temperature - It has a faint odor. - … Read more

This varies quite a bit but can be as close at 35 million miles when we are both in a line out from the sun. Our probes there are planned around these big differences. This means the brightness and value of Mars as an object to observe and photograph from Earth vary and there are … Read more

Not aware that it has, at least not in human history. And we can't know for sure even how it came to be. One theory is it came out of the Earth in the billion year old solar system creation times (not creation, but universe evolution).

Solubility is the disassociation of a solid (or liquid) compound from it's close tightly held association with other like molecules, or other atoms as in a salt. As in Salt, a solid, it has Solubility in H2O since it is more stable giving up it's crystalline lattice structure in favor of being surrounded by the … Read more

M, or molarity is the term used to tell you how many Moles of atoms or molecules is in a solution. A mole is equal to 6.023 X 10²³ atoms or molecules. So a 1M solution of anything has 6.023 X 10²³ atoms or molecules of it in it, in this case, HCl. A 3M … Read more

I know, hard to show here so maybe someday I will start uploading pics. But consider that the lower energy shells of Ca are all full, ie.,... 1s² 2s² 2p⁶ 3s² 3p⁶ and also has the next energy level shell occupied by two electrons ie. Is very reactive, quite like Magnesium. These are the two … Read more

2HCl + 2KOH --> 2KCl + 2H2O is the answer, the how is adjusting so # of atoms on each side is equal.

In Chemistry potential energy is related to the beginning and ending energy level of the reactants before and after reaction. So not how they get there but where they end up. Reactions where the main reactant ends up with a lower energy give off energy in the process and are therefore exothermic. When the final … Read more

In general, you apply energy that works to separate the atoms in a solid. Heat increases the speed of the electrons in an atom. This in turn makes them atoms bump into each other more often and hence get further separated. The further apart they are, they change from solid to liquid to gas. Some … Read more

I think that has to be a ketone at the 2 position so the Empirical would be,... C4OH7Br. Otherwise,... CH3COCH2CH2Br depends on what you mean by condensed. … Read more

Take a Half dollar and a penny, drop them side by side. They will hit the ground at the same time. Even not in a vacuum this stands as there will be no appreciable friction with the air on these thin dense objects. Of course this has to be on a planet with gravity and … Read more

1) CH3C=O   |   OH 2) [Benzene ring] -C=O   H 3) Formalin is a saturated solution of formaldehyde, water, and typically another agent, most commonly methanol Condensed or empirical I think you mean are for 1 & 2 ,.. C2O2H4 and C7H6O

5.430g FeO And Fe3O4 mix + O2(excess)  --> 5.779g 2Fe2O3 + O2 left ? Tough balancing act but if right you have 5.779g/319.2g/mole=0.0181 mole product. You then have 0.009 mole of FeO or x 71.8g/mole = 0.65g and 0.0181mole Fe3O4 x 231.4g/mole = 4.188g. [0.65g/(4.188g+0.65g)]x100%= 13.4 %. Q: Can You Calculate The Percent By Mass Of … Read more

Some of these are just empirical formulas that don't give any info on the structure of the molecule so you can't say if they are acidic or basic. The others I will answer,... Glycerin NaOH [C12H22O11, HC2H3O2] empirical CH3OH has to be Methanol (since simple empirical) = slightly acidic but can act as both in … Read more