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Answer:

The ion is written in the attached file

Explanation:

Final answer:

The most typical ions formed by K, Ca, and S are K+, Ca2+, and S2-, respectively.

Explanation:

The symbol of the ion most typically formed by each of the elements can be determined by looking at their positions on the periodic table and considering their electron configuration.

1. K (Potassium): The most typical ion formed by potassium is K+ (Potassium ion). Potassium has one valence electron in its outermost shell, and it tends to lose this electron to form a stable ion.
2. Ca (Calcium): The most typical ion formed by calcium is Ca2+ (Calcium ion). Calcium has two valence electrons in its outermost shell, and it tends to lose these electrons to achieve stability.
3. S (Sulfur): The most typical ion formed by sulfur is S2- (Sulfide ion). Sulfur has six valence electrons in its outermost shell, and it tends to gain two electrons to achieve stability.

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Answer:

Water is a renewable resource because it evaporates out of the oceans to clouds, which generate rain falling on the land. The water then runs into rivers and dams where it is used and the waste is partially cleaned before it makes its route to the sea, where the cycle begins again.

Sample Response: Sunlight is always available in nature for us to use and it cannot be used up.

The density would be the same for the whole bar as well as one half of the bar. Density is a identity I believe, by this I mean that it stays the same no matter how little or how much of the same substance you have. Since density = mass / volume, half the bar has half of the weight as well as half of the volume of the whole bar, making the density the same.

For example, a block weighs 10 grams and has a volume of 5 ml. the density would be d = 10/5 or, d = 2g/ml

Half of the block weighs 5 grams and has a volume of 2.5 ml. The density is d = 5/2.5, or, d = 2 g/ml.

See, although there are different amounts of the same substance, their density is the same.

Answer:

The heat of reaction when hydrogen and oxygen combine to form water is :

C. 571.6 kJ

Explanation:

Enthalpy Change = The enthalpy change for the formation of 1 mole of the substance from their standard state is called the enthalpy of formation.

This is intensive quantity as it is fixed for 1 mole .

Intensive properties = Those properties which are independent on the amount of the substance are intensive properties.

The value of these quantities does not get halve if you divide the substance into two equal parts. example , density, refractive index.

However , the enthalpy of reaction is extensive. Because on increasing the amount the value of the enthalpy also get doubles

Hence for this reaction :

Its value is -285.8 kJ for 1 mole

And here two moles are present . so the value of molar enthalpy is:

-285.8 x 2 = -571.6 kJ

Answer:

melting, freezing, and boiling are physical changes

Explanation:rusting and souring are ex. of chemical, not physical

Answer:

melting boiling frezzing

Explanation: