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3 years ago

10

answer now please Which device can be used to separate nails from sawdust most efficiently? A. strainer B. magnet C. colander D.

stove top

2 answers:

e-lub [12.9K]3 years ago

6 0

A magnet because it will remove only metal and not the saw dust

Hope this helps

stealth61 [152]3 years ago

3 0

Magnet?

Im not 100% but i hope this helps

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Wood burns in the presence of oxygen in the air and produces fire. After all the wood is burned, the fire stops. What is the exc

worty [1.4K]

Answer:

oxygen

Explanation:any reaction with burning involves mixing oxygen

this is correct

hope this helps plzz mark me brainliest

4 0

3 years ago

Match the following associations. Exothermic or endothermic

Alekssandra [29.7K]

<u>Answer:</u>

<em>1) ∆H is positive $\Rightarrow$ Endothermic </em>

<em>2) $E_p>E_r$ $\Rightarrow$ Endothermic </em>

<em>3) Energy is absorbed $\Rightarrow$ Endothermic </em>

<em>4) $E_r>E_p$ $\Rightarrow$ Exothermic </em>

<em>5) ∆H is negtive $\Rightarrow$ Exothermic </em>

<em></em>

<u>Explanation:</u>

∆H is called as enthalpy change

It is also called as Heat of reaction

Energy is required for the bond to break a bond.

Energy is released when a bond is formed.

$H_2+Cl_2>2HCl$

that is

$H-H+Cl-Cl>2H-Cl$

We see in this equation, bonds between hydrogen and chlorine molecules gets broken and on the right side bond is formed in HCl.

If energy of products greater than energy of reactants then the reaction enthalpy change is endothermic .

If energy of products lesser than energy of reactants then the reaction enthalpy change is exothermic .

For example

$\Delta H=E_p-E_r$

$=30KJ-20KJ$

$=+10KJ$

(positive hence endothermic)

$\Delta H=E_p-E_r$

$=10KJ-40KJ$

$=-30KJ$

(negative hence exothermic)

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3 years ago

In virginia and some other parts of the world, water has carved vast caverns out of underground limestone deposits. water, howev

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The role of the carbon dioxide in water is that it has the ability to form an acid in which it has the capacity to react with underground limestones deposits. If it is able to react with the limestone, then it will most likely produce a substance that can be water-soluble.

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2 years ago

Which tool is used to measure an object's mass

natka813 [3]

Answer:

A scale, or a weight. Both of which are more scientifically referred to as a balance.

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3 years ago

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Molecules can be composed of ____. Select all that apply. … two of more of the same atoms two or more smaller molecules two or m

sertanlavr [38]

Answer:

Explanation:

A group of two or more smaller molecules is the correct answer

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2 years ago