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Brilliant_brown [7]
3 years ago
14

Is flammability a form of chemical change or physical change

Chemistry
2 answers:
Vinvika [58]3 years ago
6 0
Chemical change C===3
Gnoma [55]3 years ago
3 0

Answer:

When a fuel burns, it combines with oxygen int the air and changes into the substances water and carbon dioxide.

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If 17.8 grams of KOH dissolve in enough water to make a 198-gram solution, what is the concentration in percent by mass?
sleet_krkn [62]
Solute of solution = 17.8 g

Solvn = 198 g

% = 17.8 / 198

w% = 0.089 x 100 = 8.9%  by mass

hope this helps!
7 0
4 years ago
A block of aluminum with a mass of 140 g is cooled from 98.4°C to 62.2°C with a release of 4817 J of heat. From these data, calc
disa [49]

Answer:

specific heat = 0.951 j/g·°C

Explanation:

Heat flow equation  => q = m·c·ΔT

q = heat flow = 4817 joules

m = mass in grams = 140 grams Aluminum

c = specific heat = ?

ΔT = Temperature Change in °C = 98.4°C - 62.2°C = 36.2°C

q = m·c·ΔT => c = q/m·ΔT = 4817j/(140g)(36.2°C) = 0.951 j/g·°C

6 0
3 years ago
Which of these statements correctly describes covalent bonds?
Goshia [24]
The most appropriate answer is B !!

Covalent bond is formed by sharing of electrons !!
8 0
3 years ago
Read 2 more answers
Explain the reaction of non-metals with oxygen
Ray Of Light [21]
Non-metals and oxygen produce non-metal oxides. Such as sulphur dioxide and nitrogen oxide which are responsible for acidic rain. Hope this helps
3 0
3 years ago
What is the mass of the steel block?
Rzqust [24]

Answer:

190.2 grams

Explanation:

each arrow points to the amount it weighs, just add it all up

7 0
3 years ago
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