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juin [17]
3 years ago
9

Two changes are described below. Ice melts to form water. Sugar cubes dissolve in hot coffee. Which statement is true about the

two changes? Both are chemical changes because there is a change in the composition of ice and sugar. Both are physical changes because there is a change in the physical states of ice and sugar. A is a physical change due to a change of state, but B is a chemical change because new molecules are formed. A is a chemical change due to a change of state, but B is a physical change because new molecules are formed.
Chemistry
2 answers:
almond37 [142]3 years ago
7 0

Answer:

both are physical changes

Explanation:

mrs_skeptik [129]3 years ago
6 0

Answer:

Both are physical changes because there is a change in the physical states of ice and sugar

Explanation:

1. melting of ice to water is a change of state from solid to liquid, although there is a change in the physical state but the chemical nature of the water remain unchanged. no new substance is produced since ice and water is the same chemically. since the reaction can be reversed by freezing. This shows a physical change

2. Dissolving sugar cubes in hot coffee is also a physical change since the sugar is dissolved into the coffee but the chemical natures of the sugar and the coffee remain the same. no new substance is formed.  that is a chemical change

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If an ion is carrying a positive charge, it means that the atom has lost electrons and if an ion is carrying a negative charge, it means that the atom has gained electrons.

For the given options:

Option A: The atomic number of hydrogen atom is 1 and the electronic configuration for  ion will be:  

Thus, this atom does not have any electrons.

Option B: The atomic number of bromine atom is 35 and the electronic configuration for  ion will be:  

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3 years ago
4. How many joules of heat are absorbed to raise
hodyreva [135]

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2 years ago
Which is an element?<br> A: H20<br> B: NaCl<br> C: Mg<br> D: CO
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3 0
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Why less electro negative elements are taken as central atom​
sladkih [1.3K]

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Explanation:

3 0
2 years ago
1. A 2-kg bowling ball sits on top of a building that is 40 meters tall. (5 pts) Circle one: KE / GPE / both ( can you show work
masha68 [24]
Potential energy is energy due to an object's height above the ground.
Potential energy = mass x gravity x height
Kinetic energy is energy due to the motion of the object.
Kinetic energy = 1/2 x mass x velocity²

1.
The ball is not moving and is at a height above the ground so it has only potential energy.
P.E = 2 x 9.81 x 40
P.E = 784.8 J

2.
The ball is moving and has a height above the Earth's surface so it has both kinetic and potential energy.
P.E = same as part 1 = 784.8 J
K.E = 1/2 x 2 x 5²
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3.
The ball has no height above the Earth's surface and is moving so it has only kinetic energy.
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4.
50000 = 1/2 x 1000 x v²
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5.
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6.
12.5 = 1/2 x 1 x v²
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98 = 1 x 9.81 x h
h = 10.0 m
3 0
3 years ago
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