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Oksanka [162]
2 years ago
10

Which type of reaction is occurring during a fireworks show? How do you know?

Chemistry
1 answer:
Natasha2012 [34]2 years ago
8 0

Answer:

It is an exothermic reaction. Heat must be added to light the fuses of the fireworks

Explanation:

I learned this in high school chemistry.

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What is the density of an object with a mass of 7.92g and a volume of 3.25mL? 
Anarel [89]
Hey there!

Using your density formula, D=M/V where D represents the density, M represents the mass, and V represents the volume, you can plug in your given values to find the density.

Knowing that your mass is 7.92 grams, and your volume is 3.25 mL, you can find the density by setting up this expression:
7.92/3.25

Now, simplify:
7.92/3.25
≈2.44

Therefore, your density of the object would be approximately 2.44 grams per mL.

Hope this helps and have a marvelous day! :)
6 0
3 years ago
How many ozone molecules can each chlorine atom in the stratosphere destroy
katrin [286]

Answer:

100,000

Explanation:

6 0
3 years ago
Why is there a vast amount of salt water on Earth?
Diano4ka-milaya [45]
Water is an excellent solvent, salt is carried by the water due to erosion and carried to the ocean.
3 0
3 years ago
To determine the concentration of SO4 2– ion in a sample of groundwater, 100.0 mL of the sample is titrated with 0.0250 M Ba(NO3
Brrunno [24]

Answer:

1.87x10⁻³ M SO₄²⁻

Explanation:

The reaction of SO₄²⁻ with Ba²⁺ (From Ba(NO₃)₂) is:

SO₄²⁻(aq) + Ba²⁺(aq) → BaSO₄(s)

<em>Where 1 mole of  SO₄²⁻ reacts per mole of Ba²⁺</em>

<em />

To reach the end point in this titration, we need to add the same moles of Ba²⁺ that the moles that are of SO₄²⁻.

Thus, to find molarity of SO₄²⁻ we need to find first the moles of Ba²⁺ added (That will be the same of SO₄²⁻). And as the volume of the initial sample was 100mL we can find molarity (As ratio of moles of SO₄²⁻ per liter of solution).

<em>Moles Ba²⁺:</em>

7.48mL = 7.48x10⁻³L ₓ (0.0250moles / L) = 1.87x10⁻⁴ moles of Ba²⁺ = Moles of SO₄²⁻

<em>Molarity SO₄²⁻:</em>

As there are 1.87x10⁻⁴ moles of SO₄²⁻ in 100mL = 0.1L, molarity is:

1.87x10⁻⁴ moles of SO₄²⁻ / 0.1L =

<h3> 1.87x10⁻³ M SO₄²⁻</h3>
8 0
3 years ago
What is the best example of an experimental scientific investigation?
ivolga24 [154]

Scientific investigation: The process in which scientist solve the question by using different systematic approach. It can be initiated in different ways.

Experimental Scientific investigation: The investigation in which scientist answer the question on the basis of experimental results. Experimental investigation includes both dependent and independent variables, and only one variable is tested at a time is possible.

The best example of an experimental scientific investigation is: when we placed a whole apple and apple slice under sun, and noted down how many days it will take to  rot in order to compare the break down of apple slice and whole apple.

Thus, option (B) is the correct answer.

7 0
3 years ago
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