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Murljashka [212]
3 years ago
13

What are the solutions to the equation x2 + 4x + 5 = 0?​

Chemistry
2 answers:
Oxana [17]3 years ago
6 0

Answer:

-1,-4

Explanation:

dusya [7]3 years ago
4 0

Answer:

-1, -4

Explanation:

x^2+4x+5=0

Factoring, you get:

(x+4)(x+1)=0

To find what x can be, you need to realize what could make this equation true. To set the left side equal to 0, either one of the terms in parentheses must be equal to 0. To do that, x must be the negative of the other term, so that they can cancel each other out. Therefore, x is -4 and -1. Hope this helps!

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I am so lost, and suggestions to how I can solve this?
Ad libitum [116K]
<h3>Answer:</h3>

165.078 g

<h3>Explanation:</h3>

<u>We are given;</u>

  • Specific heat capacity of nickel as 0.446 J/g°C
  • Initial temperature of nickel is 255.5 °C
  • Mass of water in the calorimeter is 250.0 g
  • Initial temperature of water is 20° C
  • Final temperature of the mixture is 35.5°C
  • Specific heat capacity of water is 4.18 J/g°C

We are required to calculate the mass of nickel sample;

<h3>Step 1: Calculate the amount of heat absorbed by water.</h3>

We know that quantity of heat absorbed, Q = m × c × ΔT

Change in temperature, ΔT = 35.5°C - 20°C

                                              = 15.5 °C

Therefore, Q = 250 g × 4.1 J/g°C × 15.5° C

                     = 16,197.5 Joules

<h3>Step 2: Calculate the amount of heat released by nickel sample</h3>

Assuming the mass of nickel sample is m

Then, Heat released, Q = m × c × ΔT

Change in temperature, ΔT = 255.5 °C - 35.5 ° C

                                              = 220 °C

Q = m × 0.446 J/g°C × 220° C

   = 98.12m joules

<h3>Step 3: Determine the mass of nickel sample</h3>

We know that the amount of heat absorbed is equivalent to amount of heat released.

That is, Quantity of heat absorbed = Quantity of heat released

Therefore;

98.12 m joules = 16,197.5 Joules

    m = 165.078 g

Thus, the mass of nickel sample is 165.078 g

8 0
4 years ago
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