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eduard
3 years ago
7

Which of the following is the correct scientific notation for 0.000451 g?

Chemistry
1 answer:
german3 years ago
6 0
4.5 x 10-4
An easy trick is to count the zeros.
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I am holding 0.0452 moles of a pure element and it weighs 542 mg. What element is it?
Dmitrij [34]

Answer:

Magnesium (mg) because the Atomic mass will be 24.4986amu

3 0
3 years ago
Which of the statements about peptide bonds are true? The formation of a peptide bond involves a dehydration reaction. A tripept
Mashcka [7]

Answer:

Peptide bonds form from nucleophilic attack by an α‑carboxyl carbon atom on an electron pair of an α‑amino nitrogen atom of another amino acid.

Explanation:

Peptide bond is a form of covalent bond and it is Amide type that is formed between two molecules when carboxyl group react with one molecule of amino group to release molecule of water.The peptide bond are in form pseudo-double bond characteristic; rigid, planar, and stronger than a typical Carboxyl nitrogen single bond.

Peptide bonds form from nucleophilic attack by an α‑carboxyl carbon atom on an electron pair of an α‑amino nitrogen atom of another amino acid.

3 0
3 years ago
Según la Organización Mundial de la Salud, el nitrato de plata ( densidad = 4.35 g/cc ) es una sustancia con propiedades cáustic
OlgaM077 [116]

Answer:

737.52 mL de agua

Explanation:

En este caso solo debes usar la expresión de molaridad de una solución la cual es:

M = moles / V

Donde:

V: Volumen de solución.

Como queremos saber la cantidad de agua, queremos saber en otras palabras cual es la cantidad de solvente que se utilizó para preparar los 800 mL de disolución.

Una disolución se prepara con un soluto y solvente. El soluto lo tenemos, que es el nitrato de plata. Con la expresión de arriba, calculamos los moles de soluto, y luego su masa. Posteriormente, calculamos el volumen con la densidad, y finalmente podremos calcular el solvente de esta forma:

V ste = Vsol - Vsto

Primero calcularemos los moles de soluto:

moles = M * V

moles = 2 * 0.800 = 1.6 moles

Con estos moles, se calcula la masa usando el peso molecular reportado que es 169.87 g/mol:

m = moles * PM

m = 1.6 * 169.87 = 271.792 g

Ahora usando el valor de la densidad, calcularemos el volumen de soluto empleado:

d = m/V

V = m/d

V = 271.792 / 4.35

V = 62.48 mL

Finalmente, la cantidad de agua necesaria es:

V agua = 800 - 62.48

V agua = 737.52 mL

8 0
4 years ago
This chart shows characteristics of three different types of atoms. A 3-column table with one row titled valence electrons in th
Gnoma [55]

Answer:

Atom X will accept electrons from Atom Y.

Explanation:

Im just so smart... i also took the test

3 0
3 years ago
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______ reactions generate thermal energy in a nuclear power plant as water is changed into steam
Jet001 [13]
Fission reactions generate thermal energy
8 0
3 years ago
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