All categories

3 years ago

What do all physical changesin science have in common

1 answer:

8 0

They don't change what the substance really is unlike chemical change. They chemical formula of the substance stays the same even though the substance can go under shape change.

You might be interested in

Mosquitoes lays eggs that must hatch in water. The young, called larvae live their first few days in water

nevsk [136]

Answer:

Explanation:

I believe he is C

3 0

2 years ago

A 32.5 g iron rod, initially at 22.4 ∘C, is submerged into an unknown mass of water at 63.0 ∘C, in an insulated container. The f

Allisa [31]

Answer:

The mass of water $m_{w}$ = 39.18 gm

Explanation:

Mass of iron $m_{iron}$ = 32.5 gm

Initial temperature of iron $T_{1}$ = 22.4°c = 295.4 K

Specific heat of iron $C_{iron}$ = 0.448 $\frac{KJ}{kg K}$

Mass of water = $m_{w}$

Specific heat of water $C_{w} = 4.2 \frac{KJ}{kg K}$

Initial temperature of water $T_{2}$ = 336 K

Final temperature after equilibrium $T_{f}$ = 59.7°c = 332.7 K

When iron rod is submerged into water then

Heat lost by water = Heat gain by iron rod

$m_{w}$ $C_{w}$ ( $T_{2}$ - $T_{f}$ ) = $m_{iron}$ $C_{iron}$ ( $T_{f}$ - $T_{1}$ )

Put all the values in above formula we get

$m_{w}$ × 4.2 × ( 336 - 332.7 ) = 32.5 × 0.448 × ( 332.7 - 295.4 )

$m_{w}$ = 39.18 gm

Therefore the mass of water $m_{w}$ = 39.18 gm

8 0

3 years ago

What is exothermic reaction

soldier1979 [14.2K]

A chemical reaction that releases energy usually in the form of heat

3 0

3 years ago

If an atom contains one electron and one proton,will it carry any charge or not

sertanlavr [38]

Answer:

no it will have no charge...it would be electrically neutral! because the number of protons and electrons are equal!

8 0

3 years ago

Read 2 more answers

HELP PLEASE !!!! DUE NOW!!

ratelena [41]

Answer:

The ratio of the products to reactants remains caonstant over time

Explanation:

6 0

3 years ago