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jarptica [38.1K]
3 years ago
7

Please help! I need to know what type of energy transfer each of these things are (CHOOSE FROM CONDUCTION, CONVECTION OR RADIATI

ON.) thank you so much!!!!!

Chemistry
1 answer:
Musya8 [376]3 years ago
3 0
I can't see the pictures clearly but maybe this will help

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When potassium metal is placed in water a large amount of energy is released as potassium hydroxide and hydrogen gas are produce
Ann [662]

Explanation:

2K(s)+2H_2O\rightarrow 2KOH(aq)+H_2(g)

The given reaction is redox reaction but not combustion reaction.

Redox reaction : It is a chemical reaction in which oxidation and reduction occurs simultaneously.Oxidation is gaining of electrons and reduction is loosing of electrons.

K\rightarrow K^++e^- oxidation

2H^++2e^-\rightarrow H_2 reduction

Potassium when reacts with water ,gives potassium ion in aqueous medium and combines with hydroxide ion present in water to form potassium hydroxide where as H^+ ions of water by gaining electrons (from potassium in water) gives hydrogen gas.

Hence , yes it is a redox reaction

Combustion reaction are the chemical reaction in which one reactant react with oxygen molecule to give heat and light.

Here in given reaction no oxygen molecule is appearing on reactant side.

Hence not a combustion reaction.

6 0
2 years ago
You are trying to determine the volume of the balloon needed to match the density of the air in the lab. You know that if you ca
9966 [12]

To solve this problem, we must be given first the density of air at 20 degrees Celsius. Looking up online, this is equal to:

density air (20C) = 0.0012041 g/mL

so that the volume is:

volume balloon = 0.57 g / (0.0012041 g/mL)

<span>volume balloon = 473.38 mL</span>

5 0
3 years ago
Calculate the amount (in grams) of kcl present in 75.0 ml of 2.10 m kcl
Lera25 [3.4K]
V = 75 mL = 0,075 L = 0,075 dm³
C = 2.1M
n = ?
---------------
C = n/V
n = C×V
n = 2.1×0,075
n = 0,1575 mol
--------
mKCl: 39+35.5 = 74,5 g/mol

74,5g --------- 1 mol
Xg ------------- 0,1575 mol
X = 74,5×0,1575
X = 11,73375g KCl

:•)
5 0
3 years ago
Which of these is an example of an abiotic factor?
dolphi86 [110]

What are the choices? I'll answer once you tell me those

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3 years ago
Can u make slime with takyglue,shavingcreame,Landry deterget mixed with baby oil,water
ss7ja [257]
The answer is yes, it works very well but it will b a very foamy sline bc of shaving cream
6 0
3 years ago
Read 2 more answers
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