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3 years ago

Why does it make sense that Hydrogen and Helium would be the first elements to form in the Universe?

Chemistry

1 answer:

Illusion [34]3 years ago

8 0

Answer:

Explanation:

It makes sense because Helium and Hydrogen only hold 1 and 2 subsequent protons/neutrons and electrons. When the Big Bang happened the entire universe was so hot that it was impossible for elements to form since it was impossible for electrons to stay bound to the atoms. After a few seconds the universe began to cool enough for electrons to bond to atoms and create different elements. Since Helium and Hydrogen have 1 and 2 electrons subsequently we can assume that they were the first elements to be created. Also they are the most abundant elements in the Universe which backs up this theory.

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Write the balanced equation for the reaction of 1 mol of naoh with 1 mol of h2po4

solmaris [256]

Answer:

3 NaOH + H₃PO₄ -----> Na₃PO₄ + 3 H₂O

Explanation:

This appears to be a double-displacement reaction. In these reactions, the cation of one compound is swapped with the cation of another. Therefore, Na⁺ (from NaOH) is swapped with H⁺ (from H₃PO₄). When constructing the new compounds, you may need to alter the amount of each ion within a particular compound to to make it neutral.

New Product #1: Na₃PO₄

----------> Na⁺ and PO₄³⁻

----------> +1 + 1 + 1 + (-3) = 0

New Product #2: H₂O (or HOH)

----------> H⁺ and OH⁻

----------> +1 + (-1) = 0

Now that you know the products, you need to balance the chemical equation. An equation is balanced when there is an equal amount of each element on both sides. These amounts can be modified by adding coefficients.

The unbalanced equation:

NaOH + H₃PO₄ -----> Na₃PO₄ + H₂O

Reactants: 1 sodium, 5 oxygen, 4 hydrogen, 1 phosphorus

Products: 3 sodium, 5 oxygen, 2 hydrogen, 1 phosphorus

The balanced equation:

3 NaOH + H₃PO₄ -----> Na₃PO₄ + 3 H₂O

Reactants: 3 sodium, 7 oxygen, 6 hydrogen, 1 phosphorus

Products: 3 sodium, 7 oxygen, 6 hydrogen, 1 phosphorus

**I was having trouble balancing the equation with the reactant H₂PO₄⁻. From my experience, I believe this compound may have been mistyped. As such, I used H₃PO₄. Please let me know if the reactant was written properly**

5 0

2 years ago

What is true when a reaction has reached equilibrium?

ASHA 777 [7]

Answer:

I think its `b

Explanation:

6 0

3 years ago

Read 2 more answers

The scientific method typically ends with a

kifflom [539]

Answer: Conclusion

Explanation:

After they test the hypothesis they come to a conclusion of the answer.

and sometime test it again and again

7 0

3 years ago

How did the development of the earliest idea about atoms differ from the later work of scientists?

gtnhenbr [62]

The correct answer is C. It was based on the thoughts of an early philosopher.

Explanation:

An atom is a basic and smallest unit that composes matter and that determine the properties of elements. Regarding the development of ideas related to atoms these did not begin in science but in philosophy; indeed the first person that proposed matter or elements were composed of certain smaller units was the philosophers Leucippus and his pupil Democritus in Ancient Greece, who stated atoms were eternal, infinite and defined the qualities of an object, idea that was supported by other Greek philosophers. But it was not until 16th and 17th centuries after the Middle Ages that the term re-emerged and until the 19th century it was officially proposed and there were experiments by scientists that later became a theory. Therefore, the development of the earliest idea about attoms differs from later work of scientists is that the earliest idea was based on the thoughts of an early philosopher.

4 0

3 years ago

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Heat would best be transferred by conduction between

Maslowich

A stove and a copper pot

4 0

3 years ago

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