1. identify reactants and products:
a) na + cl₂ → nacl
2. what does the arrow represent?
3. write a word equation for:
mg + o₂ → mgo
4. write a chemical equation for:
hydrogen reacts with oxygen to form water.
5. • identify the reactants and products:
a) ca + o₂ → cao
6. • what does the plus (+) sign represent in a chemical equation?
7. • write a word equation for:
a) zinc reacts with hydrochloric acid to form zinc chloride and hydrogen
8. • circle the products in the equation:
fe + s → fes
9. • why are chemical equations written using symbols instead of words?
10. • write a chemical equation for:
sodium reacts with chlorine to form sodium chloride.

Question

1. identify reactants and products:
   a) na + cl₂ → nacl
2. what does the arrow represent?
3. write a word equation for:
   mg + o₂ → mgo
4. write a chemical equation for:
   hydrogen reacts with oxygen to form water.
5. • identify the reactants and products:
   a) ca + o₂ → cao
6. • what does the plus (+) sign represent in a chemical equation?
7. • write a word equation for:
   a) zinc reacts with hydrochloric acid to form zinc chloride and hydrogen
8. • circle the products in the equation:
   fe + s → fes
9. • why are chemical equations written using symbols instead of words?
10. • write a chemical equation for:
    sodium reacts with chlorine to form sodium chloride.

Accepted Answer

### 1. a)
# Explanation:
## Step1: Recall reactant/product definition
Reactants are on the left of the arrow, products on the right.
## Step2: Identify for $ \text{Na} + \text{Cl}_2
ightarrow \text{NaCl} $
Reactants: $ \text{Na} $ (sodium), $ \text{Cl}_2 $ (chlorine). Products: $ \text{NaCl} $ (sodium chloride).
# Answer:
Reactants: Sodium ($ \text{Na} $), Chlorine ($ \text{Cl}_2 $); Products: Sodium Chloride ($ \text{NaCl} $)

### 2.
# Explanation:
## Step1: Recall arrow meaning in chemical equations
The arrow represents "yields" or "reacts to form", showing the direction of the chemical reaction (reactants → products).
# Answer:
The arrow represents "yields" (or "reacts to form"), indicating the direction of the chemical reaction (reactants form products).

### 3.
# Explanation:
## Step1: Identify reactants and products by formula
Reactants: $ \text{Mg} $ (magnesium), $ \text{O}_2 $ (oxygen). Product: $ \text{MgO} $ (magnesium oxide).
## Step2: Translate to word equation
Magnesium + Oxygen → Magnesium Oxide
# Answer:
Magnesium + Oxygen → Magnesium Oxide

### 4.
# Explanation:
## Step1: Identify chemical symbols
Hydrogen: $ \text{H}_2 $ (diatomic), Oxygen: $ \text{O}_2 $ (diatomic), Water: $ \text{H}_2\text{O} $.
## Step2: Write the equation
$ \text{H}_2 + \text{O}_2
ightarrow \text{H}_2\text{O} $ (unbalanced; balancing is often taught later, but the skeletal equation is as above).
# Answer:
$ \text{H}_2 + \text{O}_2
ightarrow \text{H}_2\text{O} $ (Note: For a balanced equation, it would be $ 2\text{H}_2 + \text{O}_2
ightarrow 2\text{H}_2\text{O} $, but the question asks for a chemical equation, so the skeletal form is acceptable initially.)

### 5. a)
# Explanation:
## Step1: Use arrow position rule
Reactants: left of arrow, products: right.
## Step2: Identify for $ \text{Ca} + \text{O}_2
ightarrow \text{CaO} $
Reactants: $ \text{Ca} $ (calcium), $ \text{O}_2 $ (oxygen). Products: $ \text{CaO} $ (calcium oxide).
# Answer:
Reactants: Calcium ($ \text{Ca} $), Oxygen ($ \text{O}_2 $); Products: Calcium Oxide ($ \text{CaO} $)

### 6.
# Explanation:
## Step1: Recall $ + $ meaning in chemical equations
The plus ($ + $) sign represents "and" or "reacts with" between reactants (or between products, but mainly for reactants: combining reactants).
# Answer:
The plus ($ + $) sign represents "and" (or "reacts with"), indicating that the substances on either side of $ + $ are reactants (or products) that combine (or are produced together) in the reaction.

### 7. a)
# Explanation:
## Step1: Identify reactants/products by name
Reactants: Zinc, Hydrochloric Acid. Products: Zinc Chloride, Hydrogen.
## Step2: Translate to word equation
Zinc + Hydrochloric Acid → Zinc Chloride + Hydrogen
# Answer:
Zinc + Hydrochloric Acid → Zinc Chloride + Hydrogen

### 8.
# Explanation:
## Step1: Recall reactant/product position
Reactants: left ($ \text{Fe} $, $ \text{S} $), Product: right ($ \text{FeS} $).
## Step2: Circle the product
Circle $ \text{FeS} $ (Iron Sulfide).
# Answer:
Circle $ \boldsymbol{\text{FeS}} $ (in the equation $ \text{Fe} + \text{S}
ightarrow \text{FeS} $, $ \text{FeS} $ is the product).

### 9.
# Explanation:
## Step1: List advantages of symbols
- Conciseness: Symbols (e.g., $ \text{H}_2\text{O} $) are shorter than "water".
- Universal: Symbols are international (e.g., $ \text{NaCl} $ is understood globally, unlike language - specific words).
- Precision: Symbols show elements/stoichiometry (e.g., $ \text{H}_2\text{O} $ shows 2 H, 1 O; words like "water" do not).
# Answer:
Chemical equations use symbols for conciseness (shorter than words), universality (international understanding), and precision (show element ratios/stoichiometry, e.g., $ \text{H}_2\text{O} $ vs. "water").

### 10.
# Explanation:
## Step1: Identify chemical symbols
Sodium: $ \text{Na} $, Chlorine: $ \text{Cl}_2 $ (diatomic), Sodium Chloride: $ \text{NaCl} $.
## Step2: Write the equation
$ \text{Na} + \text{Cl}_2
ightarrow \text{NaCl} $ (unbalanced; balanced form: $ 2\text{Na} + \text{Cl}_2
ightarrow 2\text{NaCl} $, but skeletal is acceptable initially).
# Answer:
$ \text{Na} + \text{Cl}_2
ightarrow \text{NaCl} $ (Note: For a balanced equation, it is $ 2\text{Na} + \text{Cl}_2
ightarrow 2\text{NaCl} $, but the question asks for a chemical equation, so the skeletal form is acceptable, or balanced if specified.)

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

1. a)

Step1: Recall reactant/product definition

Step2: Identify for \( \text{Na} + \text{Cl}_2

Step1: Recall arrow meaning in chemical equations

Step1: Identify reactants and products by formula

Step2: Translate to word equation

Answer:

2.