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Natasha_Volkova [10]
3 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]3 years ago
7 0
According to oddyseywear its false
Zepler [3.9K]3 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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It must be made of matter because anything and everything is made up of atoms. The other three options are made of atoms but they are also matter.
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Which property of the water molecule causes two water molecules to be attracted to each other?
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Atoms of oxygen are electronegative and attract the shared electrons in their covalent bonds.

4 0
3 years ago
112 g of aluminum carbide react with 174 g water to produce methane and aluminum hydroxide in the reaction shown below.
dolphi86 [110]

<u>Answer:</u> 4.999 moles of excess reactant will be left over.

<u>Explanation:</u>

Limiting reagent is defined as the reagent which is completely consumed in the reaction and limits the formation of the product.

Excess reagent is defined as the reagent which is left behind after the completion of the reaction.

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}       .....(1)

Given mass of aluminium carbide = 112 g

Molar mass of aluminium carbide = 143.96 g/mol

Putting values in equation 1:

\text{Moles of aluminium carbide}=\frac{112g}{143.96g/mol}=0.778mol

For the given chemical reaction:

2Al_4C_3(s)+12H_2O(l)\rightarrow 3CH_4(g)+4Al(OH)_3(s)

By the stoichiometry of the reaction:

2 moles of aluminium carbide reacts with 12 moles of water

So, 0.778 moles of aluminium carbide will react with = \frac{12}{2}\times 0.778=4.668 mol of water

Given mass of water = 174 g

Molar mass of water = 18 g/mol

Putting values in equation 1:

\text{Moles of water}=\frac{174g}{18g/mol}=9.667mol

Moles of excess reactant (water) left = 9.667 - 4.668 = 4.999 moles

Hence, 4.999 moles of excess reactant will be left over.

8 0
2 years ago
3.) All matter has both physical and chemical properties. A physical property is one that does not change the chemical nature of
dexar [7]

Answer:

D

Explanation:

It would be D because you are observing the reaction and don’t change anything

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3 years ago
What is a substance?
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A is the answer im pretty sure
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4 years ago
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