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3 years ago

Busca información acerca de si las siguientes sustancias son simples o

Chemistry

1 answer:

vazorg [7]3 years ago

7 0

Answer:

a) El cobre es un elemento químico de los denominados metales de transición. El cobre encabeza el grupo de los metales nobles: cobre, plata y oro. Los átomos de cobre tienen 29 protones y 29 electrones. El cobre tiene dos isótopos naturales estables: uno tiene 34 neutrones y el otro, 36. Es una sustancia simple

b) Los elementos químicos que componen el azufre es el fósforo y el cloro. Es una sustancia Simple.

c) El azucar o tambien llamado sacarosa (C12H22O11) esta compuesto de carbono, hidrogeno y oxigeno. Es una sustancia compuesta

d) Las fuentes principales de donde se obtienen los alcoholes son las siguientes: Fermentación de Carbohidratos: Los azucares y almidones, que a su vez provienen de los vegetales-caña de azúcar, cebada, maíz, etc-, al fermentar por acción de las levaduras producen alcohol etílico. Es una sustancia. Tanto el alcohol como la acetona son sustancias compuestas.

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If the atomic weight/atomic mass is 0 what does it mean?

Gwar [14]

Answer: Neutron matter is equivalent to a chemical element with atomic number 0, which is to say that it is equivalent to a species of atoms having no protons in their atomic nuclei. Neutron matter decays quickly into hydrogen. Neutron matter has no electronic structure on account of its total lack of electrons.

Explanation:

3 0

3 years ago

Calculate the pH of: (a) 0.1M HCl; (b) 0.1M NaOH; (c) 3 X 10% M HNO3; (d) 5 X 10-10 M HCIO.; and (e) 2 x 10-8 M KOH.

Shtirlitz [24]

Answer:

(a) $pH = -Log (0.1M) = 1$

(b) $pH = -Log (10^{-13}M) = 13$

(d) $pH = -Log (4.93x10^{-10}M) = 9.3$

(e) $pH = -Log (5^{-7}M) = 6.3$

Explanation:

To calculate de pH of an acid solution the formula is:

$pH = -Log ([H^{+}]) = 1$

were [H^{+}] is the concentration of protons of the solution. Therefore it is necessary to know the concentration of the protons for every solution in order to solve the problem.

(a) and (c) are strong acids so they dissociate completely in aqueous solution. Thus, the concentration of the acid is the same as the protons.

(b) and (e) are strong bases so they dissociate completely in aqueous solution too. Thus, the concentration of the base is the same as the oxydriles. But in this case it is necessary to consider the water autoionization to calculate the protons concentration:

$K_{w} =[H^{+} ][OH^{-}]=10^{-14}$

clearing the $[H^{+} ]$

$[H^{+} ]=\frac{10^{-14}}{[OH^{-}]}$

(d) is a weak base so it is necessary to solve the equilibrium first, knowing $Ka=3.24x10^{-8}$

The reaction is $HClO$ → $H^{+} + CO^{-}$ so the equilibrium is

$Ka=3.24x10^{-8}=\frac{x^{2}}{5x10^{-8}-x}$

clearing the <em>x</em>

${x^{2}={1.62x10^{-17}-3.24x10^{-8}x}$

$x=[H^{+}]=4.93x10^{-10}$

6 0

3 years ago

Balancing Chemical Equations Worksheet

Goshia [24]

The balanced chemical equation of the reactions given is as follows:

2LiHCO3 -----> Li2CO3 + H2O + CO2
2 N2 + 5 O2 -----> 2 N2O5
MgBr2 + KOH -----> KBr + Mg(OH)2
Mn + 2 CuCl -----> 2 Cu + MnCl2
8 Zn + S8 -----> 8 ZnS
2 NaOH + H2SO4 -----> 2 H2O + Na2SO4
2 K + 2 H2O -----> 2 KOH + H2
C5H12 + 8 O2 -----> 6H2O + 5 CO2
2 KOH + H2CO3 -----> 2 H2O + K2CO3
C4H802 + 6 O2 -----> 4 H20 + 4 CO2
16 Al + 3 S8 ---> 8 Al2S3

<h3>How to balance chemical equations</h3>

Balancing of chemical equations is the process of adding numerical coefficients in front of moles of reactants and products to ensure that the moles of atoms of elements of the reactants is equal to the moles of atoms of products formed.

The balanced chemical equation of the reactions given is as follows:

2LiHCO3 -----> Li2CO3 + H2O + CO2
2 N2 + 5 O2 -----> 2 N2O5
MgBr2 + KOH -----> KBr + Mg(OH)2
Mn + 2 CuCl -----> 2 Cu + MnCl2
8 Zn + S8 -----> 8 ZnS
2 NaOH + H2SO4 -----> 2 H2O + Na2SO4
2 K + 2 H2O -----> 2 KOH + H2
C5H12 + 8 O2 -----> 6H2O + 5 CO2
2 KOH + H2CO3 -----> 2 H2O + K2CO3
C4H802 + 6 O2 -----> 4 H20 + 4 CO2
16 Al + 3 S8 ---> 8 Al2S3

Learn more about balancing of chemical equations at: brainly.com/question/15428811

5 0

3 years ago

How does physical properties differ from chemical properties?

juin [17]

It's A.
Chemical properties cannot be determined by viewing or touching substance, and physical properties can be measured without changing the composition of matter:)

4 0

3 years ago

the element Potassium is found in the fourth. Of the periodic table what does that tell you about an atom of potassium

alexira [117]

It tells you how many atoms it has, how many protons it contains and the number of electrons.

6 0

3 years ago