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Natasha_Volkova [10]
2 years ago
9

Over the past one thousand years, the temperature of the earth has consistently risen, with every year recording a higher temper

ature than the previous year.
True or False?
Chemistry
2 answers:
Katarina [22]2 years ago
7 0
According to oddyseywear its false
Zepler [3.9K]2 years ago
4 0

Ans: False

Accurate temperature records from over 1000 years is very sparse, however based on a quantitative reconstruction of data it has been observed that during the little ice age period the temperature remained almost constant. A steady rise has only been recorded over the past 150 years.

Thus, the statement that over the past one thousand years, the temperature of the earth has consistently risen, with every year recording a higher temperature than the previous year is False.

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A wooden tool is found at an archaeological site. Estimate the age of the tool using the following information: A 100 gram sampl
lord [1]

Answer:

2578.99 years

Explanation:

Given that:

100 g of the wood is emitting 1120 β-particles per minute

Also,

1 g of the wood is emitting 11.20 β-particles per minute

Given, Decay rate = 15.3 % per minute per gram

So,

Concentration left can be calculated as:-

C left = [A_t]=\frac{11.20\ per\ minute}{15.3\ per\ minute\ per\ gram}\times [A_0]= 0.7320[A_0]

Where,  

[A_t] is the concentration at time t

[A_0] is the initial concentration

Also, Half life of carbon-14 = 5730 years

t_{1/2}=\frac {ln\ 2}{k}

Where, k is rate constant

So,  

k=\frac {ln\ 2}{t_{1/2}}

k=\frac {ln\ 2}{5730}\ years^{-1}

The rate constant, k = 0.000120968 year⁻¹

Time =?

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

So,  

\frac {[A_t]}{[A_0]}=e^{-0.000120968\times t}

\frac {0.7320[A_0]}{[A_0]}=e^{-0.000120968\times t}

0.7320=e^{-0.000120968\times t}

ln\ 0.7320=-0.000120968\times t

<u>t = 2578.99 years</u>

8 0
3 years ago
Can somebody help me with these 2 things. I honestly just need the acids and bases for both
pochemuha

Answer:

The Bronsted-Lowery acid is H2O

The Bronsted-Lowery base is CO3

The conjugate acid is HCO3

The conjugate base is OH

Explanation:

Molocules that lose a hydrogen in a reaction act as an acid, and those that recieve one act as a base.

8 0
3 years ago
PLZ ANSWER FIRST ONE TO ANSWER GETS BRAINLIEST!!!!!!
Roman55 [17]
The answer is “Heat Conduction”
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3 years ago
How many moles in 2.5 liters of methane gas
Zarrin [17]

Answer:

0.155836449023405

Explanation:

The molecular formula for Methane is CH4.

The SI base unit for amount of substance is the mole.

1 grams Methane is equal to 0.062334579609362 mole.

6 0
3 years ago
Which activity best demonstrates Ernest Rutherford’s creativity?
LenaWriter [7]

with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.

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