According to the law of conservation of matter, which statement about chemical reactions is true?

Where does the Rand water get its raw water from?

TiliK225 [7]

The Rand water gets its raw water from canal connected with Vaal Dam and also from Vaal River Barrage Reservoir.

Explanation

Rand water is a purified water supplier system which supplies drinking water in South Africa.

It also provides purified water in industries and helps in sanitization of waste water.

The Rand water gets their source from waters in spruits or streams and then they purify it and supply to country like Gauteng province, Johannesburg and other parts of African continent.

It gets source water from canal connected with Vaal Dam and also from Vaal river barrage reservoir.

It is then purified by removing the suspended impurities and disinfecting the water and then supplied by pipelines to each homes.

3 0

3 years ago

When water freezes it's density gets lower the change in density is different than that of most substances most substances get d

icang [17]

When water is in liquid form its molecules are free to move around.
Water molecules are packed reasonably close together. However when water freezes its molecules take up a hexagonal lattice (repeating structure) which has space in the middle of it.

This is largely due to hydrogen bonding between water molecules (complicated).

As a result water molecules in ice aren't packed as closely together as they are in liquid water so the density of ice is lower than that of liquid water.

Hope that helps. I doubt you need to know about hydrogen bonding.

8 0

2 years ago

Zn+2HCl=ZnCl2+H2 How many grams of ZnCl2 will be produced from 26.0 g of Zn and 42.0 g of HCl?

irakobra [83]

53.14 grams of Zn $Cl_{2}$ will be produced from 26.0 g of Zn and 42.0 g of HCl.

Explanation:

Balanced chemical reaction:

Zn + 2 HCl ⇒ Zn $Cl_{2}$ + $H_{2}$

data given:

mass of Zn = 26 grams

mass of HCl = 42 grams

mass of Zn $Cl_{2}$ = ?

here in the reaction Zn is the limiting reagent so mass of

Zn $Cl_{2}$ formed will be determined by it.

atomic mass of zinc =65.38 grams/mole

number of moles = $\frac{mass}{atomic mass of 1 mole}$

putting the values in the above equation:

number of moles of zinc = $\frac{26}{65.38}$

number of moles of zinc = 0.39 moles

From the balanced reaction it is seen that

1 mole of Zn produced 1 mole of Zn $Cl_{2}$

0.39 moles will produce x moles of Zn $Cl_{2}$

0.39 moles of Zn $Cl_{2}$ (atomic mass of Zn = 65.38 grams/mole)

mass = atomic mass x number of moles

= 0.39 x 136.28

= 53.14 grams

53.14 grams of Zn $Cl_{2}$ is formed

5 0

2 years ago

How is the mass of a liquid substance affected after it boils.

tensa zangetsu [6.8K]

<h2>The mass of a liquid substance affected after it boils : C it stays the same</h2>

Explanation:

Matter

Anything that occupies space and has mass .

The states of matter are :

Solids

Liquids

gases

Interconversion of state of matter

Solid ------liquid -----------Gas

(on heating ) (on heating )

One state can be changed in to another by changing the condition of temperature , pressure etc .
When liquid is boiled , it gets converted to gaseous form on heating .The heat supplied to change the state of matter is called latent heat .
This latent heat , just helps in increasing the spaces between particles and decreasing the forces between them Hence we can say that it helps in changing the state .But it doesn't change the mass .Hence mass of substance remains the same .
Similarly , gas -----> liquid -----> solid

(on cooling ) (on cooling )

5 0

2 years ago

A. What mass (in g) of KIO3 is needed to prepare 50.0 mL of 0.20 M KIO3?

rewona [7]

Answer:

A. 2.139g of KIO3

B. 26.67mL

Explanation:Please see attachment for explanation

3 0

2 years ago