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Agata [3.3K]
2 years ago
10

State two differences between physical change and chemical change

Chemistry
2 answers:
Lubov Fominskaja [6]2 years ago
6 0

Answer:

See explanation

Explanation:

1) Physical change is usually reversible, while chemical change isn't

2) Chemical change involves the change of chemical composition of matter while physical change doesn't

katovenus [111]2 years ago
6 0

Answer:

1. Physical changes only change the physical attributes of a substance, such as color or state, while chemical changes affect chemical composition.

2. In physical changes, no new energy or substances are produced.

Explanation:

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1. Mg2+ and Ca2+ are in the same group on the periodic table. In terms of electronic
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Answer:

Se detailed explanation.

Explanation:

Hello,

In this case, since both magnesium and calcium ions are in group IIA, we can review the following similar properties:

- Since both calcium and magnesium are in group IIA they have two valence electrons, it means that the both of them have two electrons at their outer shells.

- They are highly soluble in water when forming ionic bonds with nonmetals such as those belonging to halogens and oxygen's family.

- Calcium has 18 electrons and magnesium 10 which are two less than the total protons (20 and 12 respectively) since the both of them have lost two electrons due their ionized form.

- Their electron configurations are:

Ca^{20}=1s^2,2s^2,2p^6,3s^3,3p^6,4s^2\\\\Mg^{12}=1s^2,2s^2,2p^6,3s^2

It means that the both of them are at the s region since it is the last subshell at which their electrons are.

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3 years ago
Explain how you were able to use your knowledge of how different types of blood react with anti A, anti B, and anti Rh antibodie
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Depending upon the clumping reaction with anti A , anti B and anti Rh antibodies the blood types are determined.

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Agglutination (clumping) will occur when blood that contains the particular antigen is mixed with the particular antibody.

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3 years ago
A children's liquid cold medicine has a specific gravity of 1.23. If a child is to take 1.5 tsp in a dose, what is the mass (in
julia-pushkina [17]

Assume 1 tsp is approximately can hold 5 mL liquid.

Given the dose of medicine = 1.5 tsp

Converting 1.5 tsp to mL:

1.5 tsp * \frac{5 mL}{1 tsp} = 7.5 mL

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That means density of the medicine with respect to water will be 1.23

As the density of water is 1 g/mL

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Calculating the mass of medicine in grams:

7.5 mL * \frac{1.23 g}{mL} =9.225 g

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