Soft - Sponge
Metal - Iron
Transparent - Glass
Soluble - Salt
Opaque - Cardboard
Coal is mainly made of carbon and there’s oxygen in the air so this burns to produce carbon dioxide. Breathing it can really hurt your lungs.
NH4Br is the substance that will give an aqueous solution of ph<7.
<h3>Give a brief summary of NH4Br.</h3>
The ammonium salt of hydrobromic acid is called ammonium bromide, or NH4Br. The chemical has a salty flavor and crystallizes as colorless prisms that are easily soluble in water. It sublimes when heated. It progressively takes on a yellow hue when exposed to air due to the oxidation of minute amounts of bromide (Br) to bromine (Br2)
<h3>Write down the uses of NH4Br.</h3>
Ammonium bromide is used in
- medicinal preparations
- lithography
- process engraving
- fireproofing of wood
- photography in films
- plates and papers
- and photography in films
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Answer:C2H6N
Explanation:
Putrescine formula is C4H12N2
Assuming 100g sample is present
The percent changes to grams and it is converted to moles by dividing it with the atomic masses.
C= 54.50g/12 = 4.541moles
H = 13.73g/1 = 13.73moles
N= 31.77g/14 = 2.269moles
Divide through with the smallest moles value.
C= 4.541/2.269 = 2
H= 13.73/2.269=6
N= 2.269/2.269=1
Therefore the empirical formula is
C2H6N
Answer : The answer is,
Explanation :
Scientific notation : It is defined as the way or representation of expressing the number that are too big or too small that is written in the decimal form. That means always written in the power of 10 form.
For example : 8000 is written as, in this notation, the significant figure is, 1 but in this notation, the significant figures are, 2
The given problem are :
According to the divide and multiplication rules of scientific figures, the final answer is only as precise as the value with the least number of significant figures.
Hence, the answer is,