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3 years ago

How does energy change when it moves?? PLEASE ANSWER ASAP

Chemistry

1 answer:

Usimov [2.4K]3 years ago

4 0

Answer:

When objects collide, energy can be transferred from one object to another, thereby changing their motion. Energy can also be transferred from place to place by electric currents, which can then be used locally to produce motion, sound, heat, or light.

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In the reaction, Zn(s) + 2 HCl(aq) --> ZnCl2 (aq)+ H2(g), 25 grams of Zn are reacted with 17.5 g of HCl. How many grams of H2

Gennadij [26K]

Answer:

0.480 g of H₂ are produced, in the reaction.

Explanation:

This is the reaction:

Zn(s) + 2HCl → ZnCl₂ (aq) + H₂ (g)

We havethe mass of both reactants, so we must work with them to find out the limiting reactant and then, determine the amount of H₂ produced.

Let's convert the mass to moles ( mass / molar mass)

25 g / 65.41 g/mol = 0.382 moles Zn

17.5 g / 36.45 g/mol = 0.480 moles HCl

Ratio is 1:2, so 1 mol of Zn react with the double of moles of HCl.

0.382 moles of Zn would need the double of moles to react, so (0.382 .2) = 0.764 moles of HCl. → We only have 0.480 moles, so the acid is the limiting.

Now let's determine the moles of H₂ formed.

Ratio is 2:1, so If i take account the moles I have, I will produce the half of moles of my product.

0.480 moles / 2 = 0.240 moles of H₂ are produced.

To find out the mass, we must multiply mol . molar mass

0.240 mol . 2g/mol = 0.480 g

3 0

3 years ago

What are the missing coefficients for the skeleton equation below?

Kruka [31]

Answer:

4, 3 , 2 and 6

Explanation:

The reaction equation is given as;

NH₃ + O₂ → N₂ + H₂O

Now, we need to balance the reaction equation;

NH₃ + O₂ → N₂ + H₂O

put the numbers a,b,c and d;

aNH₃ + bO₂ → cN₂ + dH₂O

We need to balance the equation algebraically, ;

Conserving N;

a = 2c

Conserving H;

3a = 2d

Conserving O;

2b = d

Now, let c = 1, a = 2, d = 3 and b = $\frac{3}{2}$

multiply through by 2;

a = 4, b = 3, c = 2 and d = 6

Insert the parameters:

4NH₃ + 3O₂ → 2N₂ + 6H₂O

4 0

3 years ago

Calculate the number of sodium ions, perchlorate ions, Cl atoms and O atoms in 17.8 g of sodium perchlorate. Enter your answers

Degger [83]

17.8 g of sodium perchlorate contains 8.73 × 10²² Na⁺ ions, 8.73 × 10²² ClO₄⁻ ions, 8.73 × 10²² Cl atoms and 3.49 × 10²³ O atoms.

First, we will convert 17.8 g of NaClO₄ to moles using its molar mass (122.44 g/mol).

$17.8 g \times \frac{1mol}{122.44g} = 0.145 mol$

Next, we will convert 0.145 moles to molecules of NaClO₄ using Avogadro's number; there are 6.02 × 10²³ molecules in 1 mole of molecules.

$0.145 mol \times \frac{6.02 \times 10^{23}molecules }{mol} = 8.73 \times 10^{22}molecules$

NaClO₄ is a strong electrolyte that dissociates according to the following equation.

NaClO₄ ⇒ Na⁺ + ClO₄⁻

The molar ratio of NaClO₄ to Na⁺ is 1:1. The number of Na⁺ in 8.73 × 10²² molecules of NaClO₄ is:

$8.73 \times 10^{22}moleculeNaClO_4 \times \frac{1 ion Na^{+} }{1moleculeNaClO_4} = 8.73 \times 10^{22}ion Na^{+}$

The molar ratio of NaClO₄ to ClO₄⁻ is 1:1. The number of ClO₄⁻ in 8.73 × 10²² molecules of NaClO₄ is:

$8.73 \times 10^{22}moleculeNaClO_4 \times \frac{1 ion ClO_4^{-} }{1moleculeNaClO_4} = 8.73 \times 10^{22}ion ClO_4^{-}$

The molar ratio of ClO₄⁻ to Cl is 1:1. The number of Cl in 8.73 × 10²² ions of ClO₄⁻ is:

$8.73 \times 10^{22}ion ClO_4^{-} \times \frac{1 atomCl }{1ion ClO_4^{-}} = 8.73 \times 10^{22}atom Cl$

The molar ratio of ClO₄⁻ to O is 1:1. The number of O in 8.73 × 10²² ions of ClO₄⁻ is:

$8.73 \times 10^{22}ion ClO_4^{-} \times \frac{4 atomO }{1ion ClO_4^{-}} = 3.49 \times 10^{23}atom O$

17.8 g of sodium perchlorate contains 8.73 × 10²² Na⁺ ions, 8.73 × 10²² ClO₄⁻ ions, 8.73 × 10²² Cl atoms and 3.49 × 10²³ O atoms.

You can learn more Avogadro's number here: brainly.com/question/13302703

8 0

2 years ago

Atomic Theory

Fynjy0 [20]

Answer:

DASDWSDWSDWS

Explanation:

5 0

3 years ago

The major anatomic difference in autonomic reflex arcs is that there are two sensory afferents. True or False

swat32

Answer:

False

Explanation:

All organisms have involuntary and rapid muscle responses that develop in some risk situation, which are known as reflexes. Each reflex has an associated reflex arc, a circuit formed by a receiver, which corresponds to a sensitive organ; an afferent path; an integration center; an efferent pathway and an effector; components that bind each other through the synapse.

In mammals, the reflex arc is composed of:

- The receptors, which are nervous structures, which generally correspond to the dendrites of sensory neurons, which transform the energy of a stimulus into a nerve impulse, because they are able to detect specific stimuli, triggering one or more nerve impulses. It is possible to find receptors in the skin, in the sense organs, in the viscera, in the muscles and in the tendons.

- Afferent peripheral nerves, which are formed by axons that drive nerve impulses towards integration centers.

- The integration centers, which are usually the components of the central nervous system, that have association neurons, analyzing the information that the sensitive neurons bring, and then develop a response.

- The efferent peripheral nerves, which are composed of axons that drive nerve impulses from the center of integration to the muscles or glands.

- The effectors, which are those that make the response to the stimuli, being able to perform this response the smooth, cardiac muscle or a gland, when the reflexes are visceral; or striated muscle, when the responses are somatic.

8 0

3 years ago