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3 years ago

NO2+H4➡2 H2O+N What are the elements

Chemistry

2 answers:

UkoKoshka [18]3 years ago

7 0

Hydrogen, Nitrogen and Oxygen - they are all elements in the equation.

Firdavs [7]3 years ago

6 0

They are nitrogen, oxygen, hydrogen

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Which instrument is most often used to measure acid volume before a titration begins?

Darya [45]

Good Morning!

To measure the volume of an acid we use in the laboratory an instrument called burette (a). This instrument is used to calculate the volumes of chemical solutions. At first glance, these tools may be confused with syringes, but have different functions.

Hugs!

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3 years ago

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Which of the example most complete description an objects motion?

Rashid [163]

c] The golfer sent the golf ball flying toward the cup to score a hole in one.

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3 years ago

If a penny (with the this volume .39 cm^3) was made out of pure copper, what should its mass be?

blondinia [14]

Answer:

3.49 g

Explanation:

The mass is the product of volume and density:

(8.96 g/cm³)(0.39 cm³) ≈ 3.49 g

The mass of a pure-copper penny would be 3.49 g.

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3 years ago

Milk of magnesia is often taken to reduce the discomfort associated with acid stomach or heartburn. The recommended dose is 1 te

Igoryamba

Answer:

8.61 mL of the HCl solution

Explanation:

The reaction that takes place is:

2HCl + Mg(OH)₂ → MgCl₂ + 2H₂O

From the given mass of Mg(OH)₂, we can calculate the moles of HCl that are neutralized:

4x10² mg = 400 mg = 0.400g

0.400g Mg(OH)₂ ÷ 58.32g/1mol = 6.859*10⁻³ mol Mg(OH)₂

6.859*10⁻³ mol Mg(OH)₂ * $\frac{1molHCl}{1molMg(OH)_{2}} =$ 3.429x10⁻³ mol HCl

Finally, to calculate the volume of an HCl solution, we need both the moles and the concentration. We can calculate the concentration using the pH value:

pH = -log[H⁺]

1.4 = -log[H⁺]

$10^{-1.4}$ = [H⁺]

0.0398 M = [H⁺] = [HCl] *Because HCl is a strong acid*

Thus, the volume is:

0.0398 M = 3.429x10⁻³mol HCl / Volume

Volume = 8.616x10⁻³ L = 8.62 mL

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3 years ago

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In general, the atomic radius of an atom _______ as you move down a column in the periodic table? increases decreases increases

Tom [10]

Tomic radius INCREASES as you go DOWN a Group because each successive Period (row) has an additional occupied energy level. you can think of it this way: each time you drop down a row, you add a "ring."

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3 years ago

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