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Nimfa-mama [501]
3 years ago
8

On a periodic table, element names are represented by: A. numbers B. chemical symbols C. pictures D. matter

Chemistry
2 answers:
MissTica3 years ago
5 0
Hello!

This must be a multiple choice question.

On a periodic table, every element is listed by it's element symbol and atomic number. For example, the atomic number and symbol for gold are 79 and Au. So, the answers are: A. Numbers and B. Chemical symbols.
kifflom [539]3 years ago
4 0
Elements on the periodic table are represented by chemical symbols.
Ex: O means Oxygen
Ex: Ag means Silver
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How does a mole of magnesium compare with a mole of iron?
prisoha [69]
A mole of magnesium is the  number  of gra ms of magnesium corresponding to its mass numbers
4 0
3 years ago
Which of the following statements best defines Le Châtelier's principle?
8_murik_8 [283]
The answer is B. 

This is the definition of La Châtelier's principle: <span>When the equilibrium of a system is disturbed, the system makes adjustments to restore equilibrium.</span>
3 0
3 years ago
Balancee las ecuaciones químicas por el método de tanteo e identifique que tipo de reacción es: 1.1.- Cloruro férrico acuoso rea
lakkis [162]

Respuesta:

2 FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + 6 NaCl(aq)

Explicación:

Consideremos la ecuación no balanceada que ocurre cuando cloruro férrico acuoso reacciona con carbonato de sodio sólido para formar carbonato férrico sólido y cloruro de sodio acuoso. Esta es una reacción de doble desplazamiento.

FeCl₃(aq) + Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + NaCl(aq)

Vamos a usar el método de tanteo. Empezaremos balanceando los átomos de C, multiplicando Na₂CO₃ por 3.

FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + NaCl(aq)

Luego, balancearemos los átomos de Fe, multiplicando FeCl₃ por 2.

2 FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + NaCl(aq)

Finalmente, obtendremos la ecuación balanceada, multiplicando NaCl por 6.

2 FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + 6 NaCl(aq)

4 0
2 years ago
Unlike carbohydrates and lipids proteins contain which element?
Harman [31]

Answer:

The answer to your question is: Nitrogen

Explanation:

Organic molecules that are part of living organisms are composed by

Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus and Sulphur.

The elements available in more quantity are Carbon, Hydrogen and Oxygen.

Nitrogen is present in proteins and nucleic acids.

4 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
3 years ago
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