Question

My son has science homework on hypothesis he needs two examples one temperature and one on rate

Answer 1

1) if the greenhouse gases increase, it could lead to global warming.
2) Show a relationship (if this increases, then this decreases or vice versa)

remember hypotheses are an if then statement

Answer 2

Sorry if I'm not much help. Good Luck to your son and have a great day! :)

Answer 3

A hypothesis is basically an idea you have to test to determine whether it's true or not.

Is this assignment pertaining to something specific (like a chemical reaction) or can it be general?

Answer 4

It'has to be 2 predictions one on temperature and one on rate he then has to explain predictions using scientific detail and give 3 references from the evidence
I'm struggling on this

Answer 5

so you're essentially talking about 2 variables, the temperature and the rate.

My question is: what system are you testing these on?

For example, the temperature could be an independent variable on the rate of evaporation of a glass of water.

Answer 6

I'm going to work a night shift and he just tells me it's got to be in tomorrow

Answer 7

Not sure about the system sorry

Answer 8

Hm okay for the temperature.

Hypothesis: Increasing the ambient (room) temperature will decrease the time it takes for 10 mL of water in a beaker to evaporate.

Then what else would you need? you mentioned 3 references, what do you mean by that?

Answer 9

It says explain predictions with scientific detail and give 3 references from the evidence
Thanks

Answer 10

Okay, i'm going to write down the reasoning behind increasing the temperature on evaporation.

The movement (vibrations) of these water molecules become strong enough to break the intermolecular forces that hold them together. When this occurs at the water-air interface (surface), individual water molecules with sufficient kinetic energy can escape from the bulk liquid into the gas phase - this is evaporation. As the temperature increases, the kinetic energy of the water molecules in the beaker increase. This causes more water molecules to enter the gas phase in a shorter period of time.

Then i'm not sure what they mean by "references". It's vague

Answer 11

Ok that's great can you help me on the rate prediction
Thanks

Answer 12

You could talk about the rate of dissolution (dissolving) of sugar in water.

Hypothesis: The rate of dissolution of 100 g of sugar in 100 mL of water increases as the temperature increases.

Larger sugar chunks are broken apart into smaller pieces by water molecules as these are solvated (become surrounded by water molecules). When the concentration of sugar is constant, the rate of dissolution is only dependent on the temperature of the solution. (As i mentioned before) The temperature is a manifestation of the movement of molecules in the system (temperature is actually the average kinetic energy of particles in a system), when the temperature increases the motion of the particles also increases. Because faster motion creates more water molecule collisions with the sugar chunks, the effect on rate of their breakdown is influenced solely by the temperature of the system.

Answer 13

I hope this helps somewhat, maybe other people can talk about this in a simpler way, good luck!

Answer 14

That's great thanks for your help

Answer 15

no problem !