Answer:
Green plants and trees use photosynthesis to make food from sunlight, carbon dioxide and water in the atmosphere: It is their primary source of energy. The importance of photosynthesis in our life is the oxygen it produces. Without photosynthesis there would be little to no oxygen on the planet.
Water flows wit out turning on a faucet. Hope this helps :)
Which element is a metalloid? <span>B. Silicon (Si)
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Looking at the periodic table, which element is a metal? <span>D. Strontium (Sr)
</span>Argon (Ar) is a noble gas, silicon (Si) is a metalloid, hydrogen (H) is a non-metal, and strontium is a alkaline earth metal.
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I have used the periodic table from </span><span>http://chemreference.com/elements/1/properties?display=periodic&trend=number to help me when I'm unsure.</span>
i wood say l the cac12 calcium chloride
Answer : The specific heat of substance is 
Explanation :
Formula used :

or,

where,
Q = heat needed = 4.90 kJ = 4900 J
m = mass of sample = 894.0 g
c = specific heat of substance = ?
= initial temperature = 
= final temperature = 
Now put all the given value in the above formula, we get:
![4900J=894.0g\times c\times [17.5-(-5.8)]^oC](https://tex.z-dn.net/?f=4900J%3D894.0g%5Ctimes%20c%5Ctimes%20%5B17.5-%28-5.8%29%5D%5EoC)

Therefore, the specific heat of substance is 