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2 years ago

What will a presumptive test find?

1 answer:

4 0

Presumptive tests, also known as preliminary tests or field tests, allow drugs to be quickly classified into a particular chemical group, but do not unequivocally identify the presence of a specific chemical compound.

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Use the IUPAC nomenclature rules to give the name for this compound - CrPO4.

MrRissso [65]

Answer:

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Explanation:

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2 years ago

Which is an example of chemical weathering?

kobusy [5.1K]

Answer:

b. the layer of oxide formed on statues made of metal

Explanation:

Chemical weathering is a process whereby rocks are disintegrated or weathered causing a chemical reaction thereby leading to change in the parent rock constituents .

In chemical weathering a new substance is usually formed after the weathering takes place.

From the question the layer of statue made by metal will likely form oxides of those metals. Example Silver will react with oxygen to form an entirely new substance like silver(i)oxide.

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2 years ago

Copper conducts heat well.<br> physical<br> chemical

OverLord2011 [107]

Answer:

Physical property

Explanation:

We can visualize the property without the need to do any experiments.

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3 years ago

Which part of the Periodic Table of the elements is used to identify valence electrons? *

irina1246 [14]

The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized

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2 years ago

Which of the following equations has correct formulas and also is a balanced equation?

aliya0001 [1]

Answer : The correct option is, (B)

Explanation :

Balance equation : Balanced equation are those equation in which the number of atoms of each element and the total charge must be same on products side and reactants side.

In the given options, only option (B) equation has correct formula and also a balanced equation.

$2Be+O_2\rightarrow 2BeO$

while the other options has incorrect formulas and also an unbalanced equations.

The correct equation for option A is, $CaCO_3\rightarrow CaO+CO_2$

The correct equation for option C is, $2Mg+O_2\rightarrow 2MgO$

The correct equation for option D is, $KCl+HNO_3\rightarrow HCl+KNO_3$

Hence, the correct answer is, (B) $2Be+O_2\rightarrow 2BeO$

5 0

3 years ago