Looking at the periodic table, determine the charge of Sodium (Na) will make when it bonds with other atoms.

Question

a
+6
b
+1
c
-1
d
-2
e
-6
f
+2

Answer 1

Sodium (Na) typically forms a +1 charge when it bonds with other atoms. This occurs because sodium is an alkali metal that has one electron in its outermost shell. When it loses this electron, it achieves a stable electronic configuration similar to that of the nearest noble gas (neon).

Therefore, the correct answer is:

b) +1

Answer 2

This chemical reaction is balanced.

1 c2h5oh + 2 o2 turns into 2 co2 + 3 h2o

True
False

Answer 3

To determine if the reaction is balanced, we should check that the number of atoms of each element on the reactant side is equal to the number of atoms on the product side.

The reaction given is:

\[ 1 \text{ C}_2\text{H}_5\text{OH} + 2 \text{ O}_2 \rightarrow 2 \text{ CO}_2 + 3 \text{ H}_2\text{O} \]

Let's count the atoms for each side:

Reactants:

• Carbons (C): 2 (from 1 C₂H₅OH)
• Hydrogens (H): 6 (5 from C₂H₅ + 1 from OH)
• Oxygens (O): 4 (2 from 2 O₂)

Products:

• Carbons (C): 2 (from 2 CO₂)
• Hydrogens (H): 6 (from 3 H₂O)
• Oxygens (O): 7 (4 from 2 CO₂ and 3 from 3 H₂O)

Now, let's summarize the counts:

• Reactants: 2 C, 6 H, 4 O
• Products: 2 C, 6 H, 7 O

Since the number of oxygen atoms is not equal (4 on the reactants side and 7 on the products side), the equation is not balanced.

Thus, the correct answer is:

False

Answer 4

Balance the following the chemical equation:

blank1 c2h6 + blank2 o2 turns into blank3 co2 + blank4 h2o

Blank 1:
Blank 2:
Blank 3:
Blank 4:

Answer 5

To balance the combustion reaction of ethane (C₂H₆) with oxygen (O₂), we’ll follow these steps to ensure that the number of each type of atom is the same on both sides of the equation:

The unbalanced equation is:

\[ \text{C}_2\text{H}_6 + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} \]

Step-by-step balancing:

1. Count the atoms:

   • Reactants:

     • C: 2 (from C₂H₆)
     • H: 6 (from C₂H₆)
     • O: 2 (varies depending on O₂ used)

   • Products:

     • C: 1 (from CO₂)
     • H: 2 (from H₂O)
     • O: 3 (from CO₂ and H₂O combined)

2. Balance Carbon (C):

   • Place a coefficient of 2 in front of CO₂ to balance carbon: \[ \text{C}_2\text{H}_6 + \text{O}_2 \rightarrow 2 \text{CO}_2 + \text{H}_2\text{O} \]

3. Balance Hydrogen (H):

   • Place a coefficient of 3 in front of H₂O to balance hydrogen: \[ \text{C}_2\text{H}_6 + \text{O}_2 \rightarrow 2 \text{CO}_2 + 3 \text{H}_2\text{O} \]

4. Count oxygen (O):

   • Products now have:
     • O from \(2 \text{CO}_2\): \(2 \times 2 = 4\)
     • O from \(3 \text{H}_2\text{O}\): \(3 \times 1 = 3\)
     • Total = \(4 + 3 = 7\) oxygen atoms.

5. Balance Oxygen (O):

   • The reactant side has \(O_2\), so to get 7 O atoms, we need to adjust the coefficient of O₂: \[ \frac{7}{2} \text{O}_2 \] Or to avoid fractions, multiply the whole equation by 2: \[ 2 \text{C}_2\text{H}_6 + 7 \text{O}_2 \rightarrow 4 \text{CO}_2 + 6 \text{H}_2\text{O} \]

Final Balanced Equation:

\[ 2 \text{C}_2\text{H}_6 + 7 \text{O}_2 \rightarrow 4 \text{CO}_2 + 6 \text{H}_2\text{O} \]

Filling in the blanks:

• Blank 1: 2
• Blank 2: 7
• Blank 3: 4
• Blank 4: 6

Answer 6

Which of these elements on the Periodic Table is the most electronegative?

a
Mg
b
Li
c
P
d
F

Answer 7

The most electronegative element on the Periodic Table from the given options is Fluorine (F).

Fluorine is the most electronegative element overall, with an electronegativity value of approximately 3.98 on the Pauling scale.

Therefore, the correct answer is:

d) F

Answer 8

Are the following examples of chemical or physical changes?

Column A
1
A silver spoon tarnishing

2
Blowing a dandelion

3
Building a sand castle

4
Toasting bread

Column B
a.Physical change
b.Chemical change

Answer 9

Let's analyze each example to determine if it is a chemical or physical change:

Column A:

1. A silver spoon tarnishing

   • This is a chemical change because tarnishing involves a chemical reaction with sulfur compounds in the air, leading to the formation of silver sulfide on the surface of the spoon.
   • Answer: b. Chemical change

2. Blowing a dandelion

   • This is a physical change because blowing on a dandelion simply disperses its seeds without changing their chemical composition.
   • Answer: a. Physical change

3. Building a sand castle

   • This is a physical change because the sand is merely being shaped into a castle, and its chemical composition remains the same.
   • Answer: a. Physical change

4. Toasting bread

   • This is a chemical change because the heat causes chemical reactions in the bread, leading to the browning and the formation of new compounds (like the Maillard reaction).
   • Answer: b. Chemical change

Summary of Answers:

1. A silver spoon tarnishing - b. Chemical change
2. Blowing a dandelion - a. Physical change
3. Building a sand castle - a. Physical change
4. Toasting bread - b. Chemical change

Answer 10

A bond between sodium (Na) and chlorine (Cl) is what type of bond?

a
Ionic
b
Covalent
c
Metallic
d
Hydrogen

Answer 11

A bond between sodium (Na) and chlorine (Cl) is classified as an ionic bond. This occurs because sodium, an alkali metal, tends to lose one electron to achieve a stable electronic configuration, while chlorine, a halogen, tends to gain an electron to achieve stability. The transfer of electrons from sodium to chlorine creates a positively charged sodium ion (Na⁺) and a negatively charged chloride ion (Cl⁻). The electrostatic attraction between these oppositely charged ions forms the ionic bond.

Therefore, the correct answer is:

a) Ionic