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3 years ago

Glass breaking. Is it a chemical or physical change?

2 answers:

7 0

I would say that it is physical because there are no chemicals when the glass is breaking.
<em>HOPE I HELPED!!!</em>

Inessa [10]3 years ago

5 0

Glass breaking is a physical change because there is no chemical reaction occuring.

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Describe how scientists use models to make predictions.

Rashid [163]

Models help scientists to make predictions about complex systems. Some models are something that you can see or touch. ... Climate models can predict how climate will change as certain gases are added to the atmosphere. To test how good a model is, scientists might start a test run at a time in the past.

6 0

3 years ago

Read 2 more answers

As a chlorine atom becomes a negative ion, the atom blanks an electron

Andrew [12]

Answer: increases by

As a chlorine atom becomes a negative ion, the atom "increases by" an electron

Explanation:

Chlorine atom has an atomic number of 17, and an electronic configuration of 1s2, 2s2 2p6, 3s2 3p5 showing 7 valence electrons in its outermost shell.

Hence, it receives a single electron to achieve a stable octet structure with electronic configuration of

1s2, 2s2 2p6, 3s2 3p6. Therefore, Cl- is a univalent negative ion with 8 valence electrons in its outermost shell. The increase is shown below

Cl + e- --> Cl-

Thus, as a chlorine atom becomes a negative ion, the atom "increases by" an electron

7 0

3 years ago

Write a formula for the ionic compound that forms from magnesium<br> and oxygen.

Fed [463]

Answer:

MgO

Explanation:

8 0

3 years ago

The atom with the same number of neutrons as 12C is 9Be. 11B. 13C. 14N.

julia-pushkina [17]

Answer : The atom with the same number of neutrons as $^{12}C$ is, $^{11}B$

Explanation :

The given atom is, $^{12}C$

Atomic mass number = 12

Atomic number = 6

Atomic number = Number of protons = Number of electrons = 6

Number of neutrons = Atomic mass number - Atomic number = 12 - 6 = 6

Now we have to determine the number of neutrons in the given options.

In atom, $^{9}Be$

Atomic mass number = 9

Atomic number = 4

Atomic number = Number of protons = Number of electrons = 4

Number of neutrons = Atomic mass number - Atomic number = 9 - 4 = 5

In atom, $^{11}B$

Atomic mass number = 11

Atomic number = 5

Atomic number = Number of protons = Number of electrons = 5

Number of neutrons = Atomic mass number - Atomic number = 11 - 5 = 6

In atom, $^{13}C$

Atomic mass number = 13

Atomic number = 6

Atomic number = Number of protons = Number of electrons = 6

Number of neutrons = Atomic mass number - Atomic number = 13 - 6 = 7

In atom, $^{14}N$

Atomic mass number = 14

Atomic number = 7

Atomic number = Number of protons = Number of electrons = 7

Number of neutrons = Atomic mass number - Atomic number = 14 - 7 = 7

Therefore, the atom with the same number of neutrons as $^{12}C$ is, $^{11}B$

6 0

3 years ago

In your own words, please write a paragraph explaining what chemical and physical properties of elements mean.

irina1246 [14]

Answer:

If this anwser helped you mark it the brainest please

Explanation:

Properties are features, qualities or characteristics of an item. Properties shall be used to classify the components. Properties are the attributes of a material that separates it from another substance. These properties are called physical properties and chemical properties in chemistry.

8 0

3 years ago