<em>When sound waves decrease Amplitude decreases also.
I hope this helps you a lot! :)</em>
Answer:
False, False, True, True, False, True
Explanation:
- Mixtures have components that are always in fixed ratios. FALSE. The ratio of components in a mixture is variable
- Compounds can only be separated physically. FALSE. Compounds can only be separated chemically.
- The components of a mixture keep their unique properties. TRUE.
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Mixtures can be physically separated. TRUE.
- Mixtures are pure substances. FALSE. Mixtures are formed by a mixture of 2 or more pure substances, not bonded chemically.
- Compounds are pure substances. TRUE.
4. If you evaporate the water first, then the sand and salt will be nearly impossible to separate. That eliminates 1 and 2. You can't filter salt out from an aqueous solution, so that eliminates 3. 4 works because you can filter out the sand (which doesn't dissolve) then evaporate the water away from the salt.
Answer:
Platinum is a greyish-white metal of high lustre, and is very malleable and ductile. It melts in the oxy-hydrogen blowpipe and in the electric furnace; it is harder than gold and is a good conductor of electricity. In finely divided form it has the ability to absorb or occlude gases
