3 years ago

Why do scientists need a scientistc models

Chemistry

1 answer:

Kryger [21]3 years ago

3 0

Models have a variety of uses from providing a way of explaining complex data to presenting as a hypothesis.

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El NaCI corresponde a un elemento?

Schach [20]

Answer:

Sodio (Na), elemento químico del grupo de los metales alcalinos (Grupo 1 [Ia]) de la tabla periódica. El sodio es un metal blanco plateado muy suave. El sodio es el metal alcalino más común y el sexto elemento más abundante en la Tierra, y comprende el 2,8 por ciento de la corteza terrestre.

Explanation:

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3 years ago

What mass of carbon is present in 0.500 mol of sucrose?

AlexFokin [52]

C12H22O11
12×12×0.5=72

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3 years ago

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Geologists use the superposition and radioactive dating to determine the age of the Earth. Which statement correctly describes t

umka21 [38]

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Group of answer choices Using radioactive dating to determine the age of different rocks found in the desert.

Explanation:

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3 years ago

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What is the pCu of the resulting solution if 20.00 mL of 0.08 M EDTA (H4Y) is added to 15.00 mL of 0.10 M CuSO4 and buffered at

katrin [286]

Answer:

The answer is "5.4".

Explanation:

$BoH + HCL =BCL +H_2o \\\\At eq \\\\N_1V_1=N_2V_2 \\\\v_2=20 \ ml\\\\[BCL]=\frac{20 \times 0.08}{20+20}=0.04\\\\pH = \frac{1}{2} [pkw - pk_b - \log e]\\\\pk_b = 2 pH - Pkw + \Log C\\\\pK_b=5.4$

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3 years ago

How many grams of Pb are there in a sample of Pb that contains 1.15×1024 atoms? grams

Ipatiy [6.2K]

<h3>Solution:</h3>

$\text{mass of Pb = 1.15 × 10²⁴ Pb atoms} × \frac{\text{1 mol Pb}}{\text{6.022 × 10²³ Pb atoms}} × \frac{\text{207.2 g Pb}}{\text{1 mol Pb}}$

$\boxed{\text{mass of Pb = 396 g}}$

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3 years ago