CHEMISTRY HIGH SCHOOL

Which statement describes a chemical property of the element magnesium?(1) Magnesium is malleable.
(2) Magnesium conducts electricity.
(3) Magnesium reacts with an acid.
(4) Magnesium has a high boiling point.

Answers

Answer 1
Answer: Answer: option 3) magnesioum reacts with an acid.


Justification:


1) Malleability, conduction of electricity, and boiling point are physical properties.


2) Maleability is the ability to be transformed into foil. It is just a change in form. So, it is a physical property.


3) The metals conduct electricity in virtue of the array of the atoms, which permtis the flow of the electrons, but it does not involve a chemical change, so it remains being a physical proerty.


4) Boling point is the temperature at which a substance passes from liquid state to gas state, which are just different forms of the same substance. So, it is other physical property.


5) Reaction with an acid is indeed a chemical transformation: the metal (magnessium) will form a chemical bond with some spieces of the acid to form a new compound. This is a chemical reaction in virtue of the chemcial properties of the substance (its ability to react with acids)
Answer 2
Answer:

Magnesium reacts with an acid.

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Claculate the molar mass of sodium sulphate na2so4

Answers

Na₂SO₄ = 23 * 2 + 32 + 16 * 4 = 142.0 g/mol

hope this helps!

Sandy went to the candy store and wanted to use dimensional analysis she had learned in class. She only had a certain amount of money to spend. In terms of price, she figured out the following: 6 lollipops = 5 gum balls, 10 lemon heads = 16 redhots, 8 gum balls = 9 lemon heads. If sandy knows she could buy 3 lollipops, how many lemonheads could she buy with the same money?

Answers

Answer:

about 1-60

Explanation:

Answer:

she could get 3.6 lemon heads so 3

The time required for one-half of the atoms from a sample of a radioactive substance to decay is called its _____.a. half-life
b. beta decay
c. alpha decay
d. isotope number

Answers

The half life, this is how long it takes for half of the atoms to decay

Which condensed structural formula represents an unsaturated compound?(1) CH3CHCHCH3
(2) CH3CH2CH3
(3) CH3CH3
(4) CH4

Answers

Answer: The correct answer is option (1).

Explanation:

The general formula of alkanes (Saturated compounds) is given as:C_nH_(2n+2)

The general formula of alkene  (Unsaturated compounds)is given as:C_nH_(2n)

The general formula of alkynes (Unsaturated compounds)is given as:C_nH_(2n-2)

1. CH_3CHCHCH_3:C_4H_8 unsaturated hydrocarbon

2. CH_3CH_2CH_3:C_3H_8 Saturated hydrocarbon

3.CH_3CH_3:C_2H_6 Saturate hydrocarbon

4. CH_4 Saturated hydrocarbon
Number(1).A carbon atom makes 4 bondings.As the second Carbon in the conpuond has only one hidrogen,it has to make other 3,two with the other carbon atoms,one of them Being a double,making the compound unsaturated.PS:Sorry for my english,um fron Brazil

How many moles of ethyl alcohol, C2H6O, are in a 18.0 g sample?

Answers

To find moles in this sample, you would divide grams by molar mass of ethyl alcohol
(18.0g)/(46.07g/mol) = 0.391mol C2H6O

Write the correct formula for the compound formed by each of the following pairs of ions.1.) Ni^2+, SO4^2-
2.) Al^3+, O^2-
3.) Ca^2, ClO3-
4.) NH4+, P^3-
5.) Cu+, NO3-

Answers

Answer:

1.) NiSO₄; 2.) Al₂O₃; 3.) Ca(ClO₃)₂; 4.) (NH₄)₃P; 5.) CuNO₃

 Step-by-step explanation:

We can use the criss-cross method to work out the formulas. The steps are

  1. Write the symbols of the anion and cation.
  2. Criss-cross the numbers of the charges to become the subscripts of the other ion (as in the image).
  3. Write the formula with the new subscripts.
  4. Divide the subscripts by their highest common factor.
  5. Omit all subscripts that are 1.

If we use this method, the formula for the compound formed from Na⁺, SO₃²⁻ becomes Na₂SO₃.

1.) Ni²⁺ +  SO₄²⁻  ⟶ Ni₂(SO₄)₂ ⟶ NiSO₄

2.) Al³⁺ +  O²⁻     ⟶  Al₂O₃

3.) Ca²⁺ + ClO₃⁻ ⟶ Ca(ClO₃)₂  

4.) NH₄⁺ + P³⁻    ⟶ (NH₄)₃P  

5.) Cu⁺ + NO₃⁻   ⟶ CuNO₃
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