3 years ago

If two substances combine to form a new substance with different properties, a

Chemistry

2 answers:

Artist 52 [7]3 years ago

8 0

Chemical change is the answer

zimovet [89]3 years ago

8 0

If two substances are combined and create a product with different properties then a Chemical change has occurred.

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In hypothetical element, two energy levels are separated by an energy of 282 kj/mol. what wavelength of light (in nm) is involve

scZoUnD [109]

Answer:

$4.23*10^2 nm = 423 nm$

Explanation:

$E={\frac {hc}{\lambda }}$

$h=6.62607015*10^{-34}J*s\\c=299 792 458 m / s\\h*c=1.98644568*10^{-25}J*m$

282000 j/mol *1 mol/6*10^(23) = 4.7*10^(-19) J for one electron

$\lambda={\frac {hc}{E }}=\frac{1.98644568*10^{-25}J*m}{4.7*10^{-19}J} =\\\\=4.22648017*10^{-7} m = 4.22648017*10^{-7} m*\frac{10^9 nm}{1 m} =\\\\4.23*10^2 nm = 423 nm$

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3 years ago

a jar of crunchy peanut butter contains 1.43kg of peanut butter. if you use 8.0% of the peanut butter for a sandwich, how many o

chubhunter [2.5K]

Answer: 4.04 ounce

Explanation: Given: Peanut butter contained in the jar = 1.43 kg

Used Peanut butter=8.0 % of 1.43kg = $\frac{8}{100}\times 1.43kg=0.1144kg$

As we know $1kg=35.274 ounce$

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4 years ago

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A person walks at 2 km/h for four hours. What is their displacement?

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4km

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3 years ago

Please help The sun uses nuclear fusion to generate its energy. In the very distant future, the sun will eventually run out of f

QveST [7]

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2 years ago

Which substances are always produced in an acid-base neutralization reaction? Check all that apply.

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The neutralization reaction goes according to the scheme
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NaOH + HNO₃ = NaNO₃ + H₂O
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4 years ago