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Elina [12.6K]
3 years ago
13

Descuss how to find the oldest paper in a stack of papers

Chemistry
2 answers:
deff fn [24]3 years ago
8 0
It is by looking on the dates of the paper.

Hoped this helped.

~Bob Ross®
MariettaO [177]3 years ago
8 0
Either by looking at the dates or seeing which paper looks old.
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Which of the following is a reactant in aerobic respiration?
IrinaVladis [17]
The reactant in aerobic respiration is oxygen (answer C)
3 0
2 years ago
Can anyone think of some interesting facts about hydrogen? I know that there are plenty, I'm just drawing a blank right now. I'l
podryga [215]
hydrogen is the lightest element in the periodic table
7 0
3 years ago
what actually is left over of water once it self ionizes? Like what exactly are the hydrogen and hydroxide ions? Do they remain
GrogVix [38]
The formula for the self ionization of water is 2H₂O(l)⇄H₃O⁺(aq)+OH⁻(aq)

The hydronium (H₃O⁺) is usually just referred to as a hydrogen ion or a proton (H⁺) and hydroxide (OH⁻) doesn't have another name that I am aware of.  These ions do stay in solution.  However the concentrations are really small and the equilibrium constant (K(w)) is 1×10⁻¹⁴.

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5 0
3 years ago
Read the word equation: “Propane gas plus oxygen gas produces __________.”
Dmitriy789 [7]

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Propane gas plus oxygen gas produces water and carbon dioxide.

Explanation:

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5 0
3 years ago
in an experiment 3.425g of lead oxide was reduced to form 3.105g of lead the empirical formula of the lead oxide is?​
Romashka-Z-Leto [24]

Answer:

Pb3O4

Explanation:

According to this question, 3.425g of lead oxide was reduced to form 3.105g of lead in an experiment. Since lead oxide contains both lead (Pb) and oxygen (O) element,

Mass of lead oxide = 3.425g

Mass of lead = 3.105g

Mass of oxygen = (3.425g - 3.105g) = 0.320g

Next, we convert each mass value to mole by dividing by respective molar mass

Pb = 3.105g ÷ 207.2 = 0.0149mol

O = 0.320g ÷ 16 = 0.02mol

Next, we divide each mole value by the smallest (0.0149)

Pb = 0.0149mol ÷ 0.0149mol = 1

O = 0.02mol ÷ 0.0149mol = 1.342

Multiply each ratio value by 3 to get:

Pb = 1 × 3 = 3

O = 1.342 × 3 = 4.026

The whole number ratio, approximately, of Pb and O is 3:4, hence, their empirical formula is Pb3O4.

4 0
2 years ago
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