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3 years ago

What are different ways science benefits society? (NEED ANSWERS FAST)

Chemistry

1 answer:

harina [27]3 years ago

3 0

Some ways science benefits the science is by studying and making new treatements and helping the society

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4.00 g of sodium and 2.00 g of oxygen react according to the following balanced equation 4 Na + O2 → 2 Na2O Calculate the mass o

posledela

6.00g because it is a balanced equation

6 0

3 years ago

A simple machine produces 25 joules of output work for every 50 joules of input work . What is the efficiency of this machine ?

nataly862011 [7]

2:1, output is half the input

8 0

3 years ago

For the reaction

Pepsi [2]

Answer:

Mass of Na₂CrO₄ = 5.75 g

Explanation:

First of all we will write the balance chemical equation.

2AgNO₃ + Na₂CrO₄ → Ag₂CrO₄ + 2NaNO₃

Now we will calculate the moles of AgNO₃.

Number of moles = mass / molar mass

Molar mass of AgNO₃ = 107.87 + 14 + 3× 16 = 169.87 g/mol

Number of moles = mass / molar mass

Number of moles = 12.1 g / 169.87 g/mol = 0.071 mol

Now we will compare the moles of AgNO₃ and Na₂CrO₄ from balance chemical equation.

AgNO₃ : Na₂CrO₄

2 : 1

0.071 : 1/2× 0.071 = 0.0355

Now we will calculate the mass of Na₂CrO₄.

Molar mass of Na₂CrO₄ = 23×2 + 52 + 16×4 = 162 g/mol

Mass of Na₂CrO₄ = number of moles × molar mass

Mass of Na₂CrO₄ = 0.0355 mol × 162 g/mol

Mass of Na₂CrO₄ = 5.75 g

3 0

3 years ago

Write the electron configuration for Br- and state the number of valence electrons. Select one:

Aleks04 [339]

Answer:

$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^62} 4s^{2} 3d^{10} 4p^{5}$ with 7 valence electrons.

Explanation:

Bromine has 7 unpaired (valence) electrons in its outer shell, and a total of 35 elecrons. Its <em>4s</em> orbital is completely filled with 2 electrons.

The closest answer from the options would be option D.

I hope this helps.

3 0

3 years ago

The pressure of nitrogen gas at 35°C is changed from 0.89 atm to 4.3 atm. What will be its final temperature in Kelvin?

Alja [10]

Answer: The final temperature in Kelvin is 1488

Explanation:

To calculate the final temperature of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

$\frac{P_1}{T_1}=\frac{P_2}{T_2}$