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3 years ago

A substance formed when two or more chemical elements are chemically bonded together?

Chemistry

1 answer:

Ronch [10]3 years ago

6 0

Answer: a piece of pure matter which we can see from our naked eye is termed as a substance

Explanation:

every substance has physical and chemical properties like;

diamond ,water ,pure sugar ,table salt e.t.c

an element is a substance made up of same type of atoms having same atomic number[protons],and cannot be easily decomposed in to a single substance by ordinary chemical reaction example,.....

gold,copper,zinc and some are in liquid form like mercury,bromine and some are in gases for example, hydrogen ,oxygen, nitrogen

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Which is the top layer of groundwater?

Ivanshal [37]

Answer:

An aquifer is a layer of porous substrate that contains and transmits groundwater. ... The upper level of this saturated layer of an unconfined aquifer is called the water table or phreatic surface. Below the water table, where in general all pore spaces are saturated with water, is the phreatic zone.

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3 years ago

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Define relative atomic mass?

SVEN [57.7K]

Answer:

The relative atomic mass of an element is defined as the weight in grams of the number of atoms of the element contained in 12.00 g of carbon-12.

Its just another term for atomic mass.

Explanation:

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2 years ago

69g of sodium reacts with chlorine to produce sodium chloride. calculate the number of moles of chlorine required to react with

Rus_ich [418]

Answer:

3 moles of $Cl^{-}$ is needed for $Na^{+}$ to be fully consumed.

Explanation:

For the balanced equation:

$Na^{+} + Cl^{-}$ ⇒ $NaCl$

First, find the moles of Na corresponding to the 69g used the general definition of mol:

$mol Na^{+} = \frac{69 g}{23 g/mol } = 3mol$

We observe that the equation is balanced and the stoichiometric ratio between them is 1: 1.

According to this, one mole of Na will react with one mole of Cl.

3 moles of $Cl^{-}$ is needed for $Na^{+}$ to be fully consumed.

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3 years ago

When a pendulum swings, at which point is kinetic<br> energy highest:

Anna [14]

Answer:

Explanation:

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3 years ago

If a chemist analyzes a 3.84g sample containing sand and table sugar, and recovers 1.43g of sand, what percent by mass of

disa [49]

3.84 - 1.43 = 2.41
2.41g of table sugar

% mass = ( (mass of element) / (total mass) ) * 100
% mass = (2.41 / 3.84) * 100
% mass = (0.6276) * 100
% mass = 62.76

62.76%

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