3 years ago

Describe how the temperature change suggests a chemical change occurred? NO LINKS PLEASE

1 answer:

3 0

Answer:

When energy is either absorbed or released, it is indicative of a chemical change. Fireworks are an example of a chemical change that produces a temperature change and emits light.

You might be interested in

What are six characteristics all living things share

Licemer1 [7]

<span>1. Made of cells.
2. Sense and Respond to Change.
3. Reproduction.
4. DNA.
5. Use Energy.
<span>6. Grow and Develop</span></span>

5 0

4 years ago

Read 2 more answers

Calculate the mass of calcium carbide produced if 1770 kJ of heat is absorbed.

Flauer [41]

Answer:

$m=243.72g$

Explanation:

Hello,

For the given chemical reaction:

$CaO(s) + 3 C(s) \rightarrow CaC_2(s) + CO(g)$

Whose heat of reaction is 464.8 kJ/mol which means that energy is absorbed due to the chemical reaction, we can compute the moles of calcium carbide via the following relationship:

$n=\frac{1770kJ}{464.8 kJ/mol}\\ \\n=3.81mol$

Then, since the molar mass of calcium carbide is 64 g/mol, the yielded mass turns out:

$m=3.81mol*\frac{64g}{1mol}\\ \\m=243.72g$

Best regards.

7 0

3 years ago

What is the combined gas law formula ?

Lera25 [3.4K]

P = pressure, V = volume, T = absolute temperature k = constant.

4 0

3 years ago

Read 2 more answers

Determine the molar solubility of AgBr in a solution containing 0.150 M NaBr. Ksp (AgBr) = 7.7 Ă— 10-13. Determine the molar sol

Kaylis [27]

Hey there!:

Given the reaction:

NaBr ⇌ Na⁺ + Br⁻

↓ ↓ ↓

0.150M 0.150M 0.150M

AgBr ⇌ Ag⁺ + Br⁻

↓ ↓ ↓

x x 0.150M

Therefore:

Ksp = x * 0.150

x = ( 7.7 * 10⁻¹³ ) / 0.150

x = 5.1 * 10⁻¹²

Answer B

Hope that helps!

5 0

3 years ago

What is the wavelength of one ultraviolet photon if it’s frequency is 1.50 x 10^15 s^-1

Alik [6]

C=λν ==> λ=c/ν

λ= 3x10^8 m/s / 1.50 x 10^15 s^-1
λ= 2 x 10^-7 m
λ= 200 nm

5 0

3 years ago