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4 years ago

1. Who suggested that the molecular formula for

1 answer:

6 0

1) It was Avogadro (option E).

The full name is Amadeo Avogadro. He was a famous Italian scientific. He formulated the Law that states that same volume of gases at same temperature and pressure corresponds same number of particles.

2) Cathode rays are electrons and have the largest charge mass / ratio of fundamental particles found in the atom (option E)

For example, electrons have the same charge magnitude than protons, but the mass of the electrons is a small fraction of the mass of the protons. (1/1840)

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Sample X has a mass of 22.7 g and reacts with sample Y to form sample XY with a total mass of 86.9 g. What is the mass of sample

kolezko [41]

Answer:

$\large \boxed{\text{64.2 g}}$

Explanation:

X + Y ⟶ XY

mass: 22.7 g x 86.9 g

According to the Law of Conservation of Mass, the mass of the product must equal the mass of the reactants.

$\begin{array}{rcl}\text{22.7 g} + x & = & \text{86.9 g}\\x & = & \text{86.9 g} - \text{22.7 g}\\& = & \textbf{64.2 g}\\\end{array}\\\text{The mass of Y is $\large \boxed{\textbf{64.2 g}}$}$

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3 years ago

What are common materials

disa [49]

Steel

Fabric (Cotton, Polyester, Felt)

Plastic

Wood

Paper

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3 years ago

An element A forms a compound AH3 with hydrogen. Another element B forms a compound BA2 with B. Given that the valency of hydrog

Hatshy [7]

Answer:

A - 3

B - 6

Explanation:

The valency of hydrogen atom is +1

The valancy of an atom of other element combining with the hydrogen atom can be determined from the number of associated hydrogen.

when H combines with A, three atoms of hydrogen are used. Thus the valency of element A is -3

Now B combines with two molecules of A whose valency is -3

The valency of B would be twice the valency of element A i.e 6

if hydrogen combines with B, then the compound formed will be BH6

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4 years ago

Dennie wanted to see if crayfish preferred one kind of food over another. He gave one group of crayfish plants, both living and

iogann1982 [59]

Answer:

A) type of food.

5 0

3 years ago

Use the unbalanced equation NH3 + O2 = NO + H2O

Elodia [21]

<span>The balance format is
4NH3+ 5O2 -------> 4NO + 6H2O </span>

7 0

3 years ago