Ask question

Ask question

All categories

DanielleElmas [232]

3 years ago

10

Plz help fast. Which of the following represents a chemical change? (2 points)

1 answer:

Dahasolnce [82]3 years ago

8 0

Answer:

1. Decomposition of stone due to acid rain.

3. The pink color of a rose.

Explanation:

Chemical changes always end up with new products in an equation, or it has always something to do with chemicals. Physical changes on the other hand, do not result in new products and it just changes the physical properties and physical state of matter of the object.

You might be interested in

Help i attached question

Oksanka [162]

Answer:

bat dipo maklaro ang pic po

6 0

3 years ago

Read 2 more answers

The atomic number of polassium and

never [62]

Explanation:

Atomic radius decreases from left to right in a period.

Therefore Calcium would have a smaller atomic size.

6 0

3 years ago

`You have to be careful about pouring drano down your pipes since it is mainly hydrochloric acid--you can't do it if they are ma

Zanzabum

Answer:

6.67 moles

Explanation:

Given that:-

Moles of hydrogen gas produced = 10.0 moles

According the reaction shown below:-

$2Al + 6HCl\rightarrow 2AlCl_3 +3H_2$

3 moles of hydrogen gas are produced when 2 moles of aluminium undergoes reaction.

Also,

1 mole of hydrogen gas are produced when $\frac{2}{3}$ moles of aluminium undergoes reaction.

So,

10.0 moles of hydrogen gas are produced when $\frac{2}{3}\times 10.0$ moles of aluminium undergoes reaction.

<u>Moles of Al needed = $\frac{2}{3}\times 10.0$ moles = 6.67 moles</u>

6 0

3 years ago

How many molecules are there in 345 grams of carbon dioxide?

Mekhanik [1.2K]

You take the grams of CO₂ times Avogadro's number divided by the molar mass.

6 0

3 years ago

Read 2 more answers

A particle that makes up the basic unit of an element is called an __________.

AleksAgata [21]

I think it’s atoms because of google

3 0

4 years ago