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Papessa [141]
3 years ago
5

Significant figures

Chemistry
1 answer:
Sergeu [11.5K]3 years ago
4 0

Answer:

go look for that on google

Explanation:

You might be interested in
Attracting electrons to form chemical bonds is called what
MAXImum [283]

Answer: Ionic bonding

7 0
3 years ago
Read 2 more answers
Calculate the pH value in each of the following solutions, given their [H3O+] concentrations.
FrozenT [24]

Answer:

See Explanations ...

Explanation:

In general, pH is a 'p-factor' expression which, simply put, is a way to express very small numbers (i.e.; exponential data with 10⁻ⁿ value ranges) in a more convenient form. That is, by definition, pX = -log(X) where X is the data value of interest. In practical terms, p-factor analysis can be applied to a number of physical & chemical measurements such as ...

pH => measure of acidity of solution = -log[H₃O⁺]

pOH => measure of alkalinity of solution = -log[OH⁻]

pKa => measure of weak acid ionization in aqueous solution = -log(Ka)

pKb => measure of weak base ionization in aqueous solution = -log(Kb)

pKsp => measure of salt ionization in aqueous solution = -log(Ksp)

Such can be applied to ranges of small-number values defining other chemical and physical properties.

For this problem:

Gastric Juice: [H₃O⁺] = 1.6 x 10⁻²M => pH = -log(1.6 x 10⁻²) = -(-1.80) = 1.8

Cow's Milk:  [H₃O⁺] = 2.5 x 10⁻⁷M => pH = -log(2.5 x 10⁻⁷) = -(-6.60) = 6.60

Tomato Juice:  [H₃O⁺] = 5.0 x 10⁻⁵M => pH = -log(5.0 x 10⁻⁵) = -(-4.30) = 4.30

Other Applications:

Given:

[OH⁻] = 6.30 x 10⁻¹³M => pOH = -log(6.30 x 10⁻¹³) = -(-12.2) = 12.2

Ka = 4.5 x 10⁻⁵ => pKa = -log(4.5 x 10⁻⁵) = -(-4.35) = 4.35

Kb = 8.2 x 10⁻⁶ => pKb = -log(8.2 x 10⁻⁶) = -(-5.09) = 5.09

Ksp = 5.5 x 10⁻¹⁰ => pKsp = -log(-5.5 x 10⁻¹⁰) = -(-9.26) = 9.26

Note: The values for Ka, Kb & Ksp are typically provided in tables of weak acid ionization constants (Ka-values), weak base ionization constants (Kb-values) or solubility product constants of salts (Ksp-values).

Hope this helps, Doc :-)

4 0
3 years ago
Si en un laboratorio hay 300 moles de plomo y 300 moles de plata en cual de los dos casos la masa en mayor?
docker41 [41]

Answer:

Esto significa que la masa en las moles de plomo es mayor que en las de plata.

Explanation:

Las moles de los átomos representan la cantidad de átomos presentes. Para saber la masa de los átomos debemos convertir las moles a gramos usando el peso molecular de cada uno de los átomos (207.2g/mol para el plomo y 107.82g/mol para la plata).

La masa de plomo en 300 moles es:

300 moles * (207.2g / mol) = 62160g de plomo

Y la masa de plata es:

300 moles * (107.82g / mol) = 32346g de plata

<h3>Esto significa que la masa en las moles de plomo es mayor que en las de plata</h3>
4 0
3 years ago
En un experimento hacemos reaccionar a una solución de acido cloridico con el metal cinc. Para ello, hemos usado, 6,5g de cinc y
Cerrena [4.2K]

Answer:

0.200g de gas son obtenidos

Explanation:

La reacción de ácido clorhídrico, HCl, con Zn es:

2HCl(aq) + Zn(s) → ZnCl₂(s) + H₂(g)

<em>Donde 2 moles de ácido reaccionan con 1 mol de Zn para producir una mol  de cloruro de cinc y una mol de hidrógeno (gas)</em>

Asumiendo que el ácido está en exceso, las moles de 6.5g de Zn (Masa molar: 65.38g/mol) son:

6.5g × (1mol / 65.38g) = <em>0.0994 moles de Zn</em>

Como 1 mol de Zn produce 1 mol de hidrógeno, las moles de hidrógeno son 0.0994 moles de H₂. En gramos (Masa molar H₂ = 2.01g/mol):

0.0994 moles H₂× (2.01g / mol) = <em>0.200g de gas son obtenidos</em>

5 0
3 years ago
Dashawn has to find the volume of his phone for science
Mamont248 [21]

Answer: Volume of rectangle = L * W * H

Explanation: Multiply the 3 numbers together

6 0
3 years ago
Read 2 more answers
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