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Romashka-Z-Leto [24]
3 years ago
10

wegener used that the same dinosaur fossils have been found in different continents to support his theory of continental drift.

true /false
Chemistry
1 answer:
shutvik [7]3 years ago
4 0
The answer to this would be true.
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Use the mass and volume data to calculate the density of an unknown metal to the nearest hundredth.
11Alexandr11 [23.1K]

Answer:

8.90

Explanation:

Density = mass ÷ volume

D = 222.50 g ÷ 25.00

= 8.9

The density of the unknown metal is 8.90.

Hope that helps.

8 0
4 years ago
Read 2 more answers
In which situation is it better to have low friction?
Ray Of Light [21]
A student walks down a hall I’m pretty sure
7 0
3 years ago
Analyze the following chemical combinations<br>a) MgO<br>b)CaCl2<br>c) Na2O​
Rashid [163]
The answer is B for sure
8 0
3 years ago
¿A qué grupo pertenecen los átomos de Z = 8, Z= 36 y Z=39? ¿Cuántas capas de electrones tiene cada uno? ¿Cuántos electrones harí
zaharov [31]

Answer:

Mira la explicación.

Explanation:

¡Hola!

En este caso, podemos encontrar facilmente el grupo al que pertenecen dichos elementos con números atómicos 8, 36 y 39 respectivamente mediante su búsqueda en la tabla periódica. Así, z=8 corresponde a oxígeno, z=36 a kriptón y z=39 a itrio.

Por otro lado, para saber el número de capas, debemos desarrollar la configuración electrónica para cada uno:

O: 1s^2,2s^2,2p^4\\Kr: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^6\\Y:1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^6,5s^2,4d^1

Con esto, vemos que oxígeno tiene dos capas, kripton cuatro capas e iritrio cinco, a lo que a oxígeno le faltan dos electrones para llenar dicha capa, a kripton ninguno y a iritrio nueve.

Saludos.

3 0
3 years ago
Compound A has 4 moles of hydrogen, 4 moles of oxygen, and
Sophie [7]

Answer:

H₄SiO₄

Explanation:

From the question given above, the following data were obtained:

Hydrogen (H) = 4 moles

Oxygen (O) = 4 moles

Silicon (Si) = 1 mole

Empirical formula =?

Since the number of mole of each atom of the element present is known, the empirical formula of the compound can be written as follow:

H₄SiO₄

3 0
3 years ago
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