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3 years ago

Which substance reacts with an acid to form hydrogen gas?

Chemistry

2 answers:

Katarina [22]3 years ago

7 0

A metal reacts with an acid to produce Hydrogen gas. I am sure of it

Marysya12 [62]3 years ago

4 0

Zinc reacts with non- oxidising acids to form hydrogen gas

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A particle of light has a wavelength of 7.0×10−7 m. What color of light is represented and what is the amount of energy released

Alisiya [41]

Answer:

red and 4.6×10^-40

Explanation:

The energy of a foton is calculated by thefollowing formula: Efoton=h×(c/lapda). Fill in 7.0×10^-7 gives us Efoton=6.626×10^-34 (planck constant) × 7.0×10^-7=4.6×10^-40.

5 0

3 years ago

Gold is a precious substance explain how you would classify gold

vodomira [7]

I would classify gold as an underground treasure, high in value that can be issued with sentimental value.

Or in smaller kid langue...

I would classify gold as an underground metal that can be used on jewelry or to make something that could mean something to someone.

If your in 2-4, I would use the second one. If you are in a grade higher than 4th, go ahead and blow your teachers mind by writing the first one. PLEASE do not copy it word for word! Make it your own so you do not plagiarise!

Plagiarise- "copy from {someone} and pass it off as one's own." (google web)

5 0

3 years ago

Given the reaction 2NO2 1/202 N2O5, what is the relationship between the rates of formation of N,0, and disappearance of the two

daser333 [38]

Answer:

$r=\frac{r(NO_{2})}{2} =\frac{r(O_{2})}{1/2}=\frac{r(N_{2}O_{5})}{1}$

Explanation:

Let us consider the reaction:

2 NO₂ + 1/2 O₂ ⇄ N₂O₅

The rate of formation of a substance is equal to the change in concentration of the product divided the change in time:

$r(N_{2}O_{5})=\frac{\Delta [N_{2}O_{5}] }{\Delta t}$

The rate of disappearance of a reactant is equal to to the change in concentration of the reactant divided the change in time, with a negative sign so that the rate is always a positive variable.

$r(NO_{2})=-\frac{\Delta[NO_{2}] }{\Delta t}$

$r(O_{2})=-\frac{\Delta[O_{2}] }{\Delta t}$

The rate of the reaction is equal to the rate of any substance divided its stoichiometric coefficient. In this way, we can relate these expressions:

$r=\frac{r(NO_{2})}{2} =\frac{r(O_{2})}{1/2}=\frac{r(N_{2}O_{5})}{1}$

8 0

3 years ago

According to the law of conservation of matter, atoms cannot be created or destroyed during a chemical reaction. what do you thi

Zarrin [17]

The word atom comes from the Greek atomos which means indivisible, indivisible (excepted in the nuclear reactions). It was therefore perfectly suited to the concept of atom when it was developed by chemists in the early nineteenth century, ie as the smallest part of a pure body.

So the atom of aluminum will remain unchanged, whatever the reaction it will undergo, it is only its molecular form that will change.

3 0

3 years ago

How long it takes a 100 watt light bulb to use 10,000 J of electrical energy?

vlabodo [156]

Answer:

A 100-watt light bulb takes 100 seconds to use 10,000 J of electrical energy.

Explanation:

Power refers to the amount of work done (or energy consumed) per unit of time. It is usually measured in watts (W), which is equal to 1 Joules per second ( $\frac{J}{s}$ )