Ask question

Ask question

All categories

3 years ago

5

When using a calorimeter, the initial temperature of a metal is 70.4C. The initial temperature of the water is 23.6C. At the end

of the experiment, the final equilibrium temperature of the water is 29.8C.

1 answer:

Zinaida [17]3 years ago

6 0

Answer:

temperature of a metal is29.8

temp. of water is 6.2

temp. change of metal -40.6

Explanation:

You might be interested in

Giving Brainliest to The first One who gets this correct<br><br><br> Thank you

erik [133]

Answer:

D.

Explanation:

Because The temperature of our hand could be hot and it could be melting the smoothie

8 0

3 years ago

True or false<br><br> The central core of an atom is called the hub.

polet [3.4K]

I think its true.

Explanation:

.....

8 0

3 years ago

Read 2 more answers

What is the percent yield for the reaction pcl3(g) + cl2(g) ? pcl5(g) if 119.3 g of pcl5 (? = 208.2 g/mol) are formed when 61.3

Whitepunk [10]

The balanced chemical reaction would be

<span>pcl3(g) + cl2(g) = pcl5(g)

First, we need to determine the theoretical yield of the reaction assuming that all of the limiting reactant is used up. Then, we divide the actual yield to the theoretical yield to determine the percent yield.

Theoretical yield = 61.3 g Cl2 ( 1 mol / 70.9 g) ( 1 mol PCl5 / 1 mol Cl2 ) ( 208.2 g / 1 mol ) = 180.01 g PCl5

Percent yield = 119.3 g / 180.01 g x100 = 66.3%</span>

4 0

3 years ago

Read 2 more answers

If an element is a reactant or product in a chemical reaction, the reaction must be an oxidaton-reduction reaction. Why is this

Bezzdna [24]

Explanation:

Oxidation reduction reactions are the reactions in which one specie oxidizes and other reduces.

For example,

$2Na+2HCl\rightarrow H_2+2NaCl$

This is a oxidation reduction reaction because sodium in elemental state ( 0 oxidation state) oxidizes to Na⁺ in NaCl. Also H⁺ in HCl reduces to H° in H₂.

Elements are present in 0 oxidation state and either it is formed or consumed, its oxidation state has to be changed for a chemical reaction to occur. Hence, it is true.

8 0

4 years ago

What is the molecular formula of CHN

melomori [17]

C=Carbon Mass percent of: 44.4424 %
H=Hydrogen Mass percent of: 3.7296 %
N=Nitrogen Mass percent of: 51.8280 %

4 0

4 years ago

Read 2 more answers