Answer: Atmosphere
Explanation:
if a scientist wants to predict the weather, they should most directly study Atmosphere.
Answer:
Soap decreases surface tension by changing the way water behaves on the surface. Hard and soft water react differently when soap is added to them.
Explanation: i think it is this
The answer is (4) zinc. Zinc can react with HCl at room temperature spontaneously and create H2. You can know this property from the metal activity order.
Answer :
(1) is act as a base and act as an acid.
(2) We can not classified as a base or an acid.
Explanation :
According to Arrhenius concept, a base is defined as a substance which donates hydroxide ions when dissolved in water and an acid is defined as a substance which donates hydronium ions in water.
(1) The given chemical reaction is:
In this reaction, produces ions and produces ions.
Thus, is act as a base and act as an acid.
(2) The given chemical reaction is:
Arrhenius concept is only applicable on aqueous solution. Thus, we can not classified as a base or an acid.
Explanation:
Julian should use the ordinary wooden ramp and wooden block as the control . A control group is usually not priority of the experiment. It is used to understand an experiment better.
- The control in this experiment can be just the ordinary wooden ramp and the blocks.
- He should time the rate at which the blocks slides down the ramp.
- This will be a perfect control in the experiment and it can give information about how the blocks will fare ordinarily without any lubricant.
Learn more:
Experimental design brainly.com/question/5249450
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