4 years ago

You observe that heat is released during a chemical reaction. This reaction is a(n) _______ reaction.

Chemistry

1 answer:

jarptica [38.1K]4 years ago

3 0

The answer should be endothermic

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The technetium-99 nuclide radioactively decays by beta emission. write a balanced nuclear chemical equation that describes this

nekit [7.7K]

Tc-99m is a metastable isomer of Tc-99. It finds widespread applications in medical diagnostic procedures.

Tc-99 is also a radioactive element. It's half-life is 2,11,000 years. Upon radioactive decay, it emits beta particles and gets converted into stable compound Ruthenium-99

This process of radioactive decay is shown below.
99 43Tc → 99 44Ru + 0 -1e
(stable) (β particle)

7 0

3 years ago

On a periodic table, element names are represented by:

alina1380 [7]

Answer: Symbols

Explanation:

4 0

3 years ago

HELPPP PLS

photoshop1234 [79]

I think it could be C maybeee though

6 0

3 years ago

10. At 573K, NO2(g) decomposes forming NO and O2. The decomposition reaction is second order in NO2 with a rate constant of 1.1

leva [86]

Answer:

48.67 seconds

Explanation:

From;

1/[A] = kt + 1/[A]o

[A] = concentration at time t

t= time taken

k= rate constant

[A]o = initial concentration

Since [A] =[A]o - 0.75[A]o

[A] = 0.056 M - 0.042 M

[A] = 0.014 M

1/0.014 = (1.1t) + 1/0.056

71.4 - 17.86 = 1.1t

53.54 = 1.1t

t= 53.54/1.1

t= 48.67 seconds

Hence,it takes 48.67 seconds to decompose.

6 0

3 years ago

A double covalent bond involves two atoms sharing two electrons? True or false

jarptica [38.1K]

Answer:

False

Explanation:

A double covalent bond means 2 atoms or elements are sharing 4 electrons.

*single covalent bond shares 2 electrons.

4 0

3 years ago