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garri49 [273]
3 years ago
10

When placed in a freezer, liquid water turns into solid ice. Why is this considered a physical change? A. The physical structure

of the water molecules change as bonds are broken and atoms are rearranged.. B. Only the motion and arrangement of the particles changes, not the identity of the substance.. C. The water molecules react when exposed to the cold temperature, causing the atoms to separate.. D. Only the arrangement of the atoms within the molecules changes, not the distance between them
Chemistry
2 answers:
avanturin [10]3 years ago
6 0

<span>A physical change changes the bonds between molecules of the substance. so option a is right.</span>
oksian1 [2.3K]3 years ago
3 0
B. Only the motion and arrangement of the particles changes, not the identity of the substance
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Air, Sea water, alloy afe the examples of
ratelena [41]

Answer:

B. Mixture

because air,sea water and alloy are example of Mixture

8 0
3 years ago
Find the final equilibrium temperature when 15.0 g of milk at 13.0 degrees c is added to 148 g of coffee with a temperature of 8
user100 [1]

According to zeroth law of thermodynamics, when two objects are kept in contact, heat (energy) is transferred from one to the other until they reach the same temperature (are in thermal equilibrium). When the objects are at the same temperature there is no heat transfer.

So, at equilibrium, q_{lost}=q_{gain},  q_{lost}= q_{milk} + q_{coffee}

q=m×c×T, where q = heat energy, m = mass of a substance, c = specific heat (units J/kg∙K), T is temperature

q_{lost}= (15X13X4.19)+(148X88.3X4.19), (15+148)X4.19XT_{final}=(15X13X4.19)+(148X88.3X4.19)

T_{final}= 81.37 ° C

6 0
3 years ago
What causes the temperature to decrease with altitude through the mesosphere?
ololo11 [35]
The temperature decreases because there is no ozone in the mesosphere and the amount of air is decreasing.

3 0
3 years ago
Can I please Get Help with this question ‍♂️ ?
Nitella [24]

Answer:

Mg(NO4)2 is 180.3 g/mol

Explanation:

First find the substance formula.

Magnesium Nitrate.

Magnesium is a +2 charge.

Nitrate is a -1 charge.

So to balance the chemical formula,

We need 1 magnesium atom for every nitrate atom.

2(1) + 1(-2) = 0

So the substance formula is Mg(NO4)2.

Now find the molar mass of Mg(NO4)2.

Mg = 24.3 amu

N = 14.0 amu

O = 16.0 amu

They are three nitrogen and twelve oxygen atoms.

So you do this: 24.3 + 14.0(2) + 16.0(8) = 180.3 g/mol

So the molar is mass is 180.3 g/mol.

The final answer is Mg(NO4)2 is 180.3 g/mol

Hope it helped!

7 0
3 years ago
A device that does work with only one movement and changes the size or direction of a force is a(n) ____.
worty [1.4K]

Answer:

A device that does work with only one movement and changes the size or direction of a force is a simple machine.

Explanation:

  • For applying force, any used basic mechanical devices are simple machines.
  • Simple machine changes the direction as well as the amplitude of the applied force i.e. we can increase or decrease the magnitude of the force.
  • A simple machine is the most basic mechanism to use the force as we need in big mechanical machines.
  • Some of the examples of simple machines are inclined plane, lever, wedge, wheel and axle, pulley, and screw.
6 0
3 years ago
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