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3 years ago

Which pH change represents a hundredfold increase in the concentration of H3O+?

1 answer:

5 0

The answer is (3) pH 3 to pH 1. The pH is related to the concentration of H3O+ with the relationship: pH = -lg c(H+). So when concentration of H3O+ increase, the pH will decrease. And decrease 2 when when increase hundredfold. Because 100=10^2.

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Which structure is found in all eukaryotic cells

jeka57 [31]

Plasma Membrane, nucleus, and cytoplasm

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3 years ago

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Which element forms the basis of all organic compounds

Veronika [31]

Carbon
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3 years ago

4. When 732 grams of water was heated, it absorbed 1962 Joules of heat. The original temperature of the water was 45°C. What was

SCORPION-xisa [38]

Answer:

$T_{final} =45.64C$ =final temperature

Explanation:

In the question specific heat of water is not given but we should know the value of that and it 4.18Jg∘C

Specific heat means how much heat is required to increase the temperature of 1 gram of substance that substance by 1∘C .

Equation between heat lost or gain and the change in temperature.

q=m⋅c⋅ΔT , where

q - the amount of heat

m - the mass of the sample

c - specific heat of sample

ΔT - change in temperature

put all the given value into this ,

$q=m\times c \times \Delta T$

$\Delta T=\frac{q}{mc} =\frac{1962}{732 \times 4.18}$

$\Delta T= 0.64C$

$T_{final} -T_{initial} =0.64C$

$T_{final} =45.64C$ =final temperature.

8 0

4 years ago

Classify each chemical reaction:

I am Lyosha [343]

Answer:

1) combustion

2) double replacement

3) combination

4) combustion

Explanation:

The combustion of a compound refers to the reaction of that compound with oxygen to produce heat and light. In reactions (1) and (4) above, ethanol and methane reacted with oxygen to yield carbon dioxde and water. This is a combustion reaction.

Reaction(2) is a double replacement reaction because the both cations exchange their anion partners in the product.

Reaction (3) is a combination reaction. It involves the joining of two elements to form a new compound.

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3 years ago

The thermometer in the picture reads, "19.9 degrees Celsius".

GalinKa [24]

Answer:

Sorry but i can't help

Explanation:

i need to really finesh s

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3 years ago