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3 years ago

Help me now plssssssss i will give brainliest!!!!!!!!!!!!!!!!!!!!!!!

Chemistry

1 answer:

Blababa [14]3 years ago

5 0

Products are copper+ aluminium chloride
reactants are aluminium+copper chloride

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To balance a chemical equation it may be necessary to adjust the

Mars2501 [29]

Answer:

To balance a chemical equation it may be necessary to adjust the coefficients.

Explanation:

The coefficients of a chemical equation are the numbers that you put in front of each reactant and product. They are used to balance the equation and comply with the law of mass conservation.

By adjusting the coefficients you obtain the relative amounts (moles) of each product and reactant, i.e. the mole ratios.

Here an example.

The first information is what is called a word equation. E.g. nitrogen and hydrogen react to form ammonia:

Word equation: hydrogen + nitrogen → ammonia

Skeleton equation: H₂ + N₂ → NH₃

This equation shows the chemical formulae but it is not balanced. The law of mass conservation is not observed.

So, in order to comply with the law of mass conservation you adjust the coefficients as follow.

Balanced chemical equation: 3H₂ + N₂ → 2NH₃

As you see, it was necessary to modify the coefficients. Now the law of conservation of mass is observed and you get the mole ratios:

3 mol H₂ : 1 mol N₂ : 2 mol NH₃

4 0

3 years ago

A sailor on a trans-Pacific solo voyage notices one day that if he puts 735.mL of fresh water into a plastic cup weighing 25.0g,

Gennadij [26K]

Answer:

Amount of salt in 1 L seawater = 34 g

Explanation:

According to Archimedes' principle, mass of freshwater and cup = mass of equal volume of seawater

mass of freshwater = density * volume

1 cm³ = 1 mL

mass of freshwater = 0.999 g/cm³ * 735 cm³ = 734.265 g

mass of freshwater + cup = 734.265 + 25 = 759.265 g

Therefore, mass of equal volume of seawater = 759.265 g

Volume of seawater displaced = 735 mL = 0.735 L (assuming the cup volume is negligible)

1 liter = 1000 cm³ = 1000 mL;

Density of seawater = mass / volume

Density of seawater = 759.265 g / 0.735 L = 1033.01 g/L

Density of freshwater in g/L = 0.999 g/ (1/1000) L = 999 g/L

mass of 1 Liter seawater = 1033.01 g

mass of 1 Liter freshwater = 999 g

mass of salt dissolved in 1 L of seawater = 1033.01 g - 999 g = 34.01 g

Therefore, amount of salt in 1 L seawater = 34 g

4 0

3 years ago

Who knows this........

kvv77 [185]

Answer:

Explanation:

This creates a gap that we call an oceanic trench

4 0

2 years ago

Read 2 more answers

using the Bohr model for hydrogen: energy = hc/wavelength = 2.18 x 10^-18 Joules (1/nf2 - 1/ni2) N=15 to n=5

soldier1979 [14.2K]

Answer:

Energy lost is 7.63×10⁻²⁰J

Explanation:

Hello,

I think what the question is requesting is to calculate the energy difference when an excited electron drops from N = 15 to N = 5

E = hc/λ(1/n₂² - 1/n₁²)

n₁ = 15

n₂ = 5

hc/λ = 2.18×10⁻¹⁸J (according to the data)

E = 2.18×10⁻¹⁸ (1/n₂² - 1/n₁²)

E = 2.18×10⁻¹⁸ (1/15² - 1/5²)

E = 2.18×10⁻¹⁸ ×(-0.035)

E = -7.63×10⁻²⁰J

The energy lost is 7.63×10⁻²⁰J

Note : energy is lost / given off when the excited electron jumps from a higher energy level to a lower energy level

5 0

3 years ago

The removal of silver tarnish from silverware using aluminum foil and a solution of electrolyte is an example of

eimsori [14]

Answer:

The answer is C. An electrochemical cell.

Explanation:

The aluminum ion react with the sulfide to form aluminum sulfide.

8 0

3 years ago