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3 years ago

Select the correct answer.

Chemistry

2 answers:

Svetlanka [38]3 years ago

6 0

C. A positive calcium ion and a negative oxygen ion

Mariulka [41]3 years ago

5 0

Answer:

C. a positive calcium ion and a negative oxygen ion

Explanation:

Ionic bonds are generally positive and negative because one is gaining electrons while the other is losing.

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A food substance kept at 0Â°C becomes rotten (as determined by a good quantitative test) in 8.3 days. The same food rots in 10.6

ZanzabumX [31]

Answer:

1. 67.2 kJ/mol

Explanation:

Using the derived expression from Arrhenius Equation

$In \ (\frac{k_2}{k_1}) = \frac{E_a}{R}(\frac{T_2-T_1}{T_2*T_1})$

Given that:

time $t_1$ = 8.3 days = (8.3 × 24 ) hours = 199.2 hours

time $t_2$ = 10.6 hours

Temperature $T_1$ = 0° C = (0+273 )K = 273 K

Temperature $T_2$ = 30° C = (30+ 273) = 303 K

Rate = 8.314 J / mol

Since $(\frac{k_2}{k_1}=\frac{t_2}{t_1})$

Then we can rewrite the above expression as:

$In \ (\frac{t_2}{t_1}) = \frac{E_a}{R}(\frac{T_2-T_1}{T_2*T_1})$

$In \ (\frac{199.2}{10.6}) = \frac{E_a}{8.314}(\frac{303-273}{273*303})$

$2.934 = \frac{E_a}{8.314}(\frac{30}{82719})$

$2.934 = \frac{30E_a}{687725.766}$

$30E_a = 2.934 *687725.766$

$E_a = \frac{2.934 *687725.766}{30}$

$E_a =67255.58 \ J/mol$

$E_a =67.2 \ kJ/mol$

7 0

3 years ago

Consider the biochemical pathway: A + E1 –> B + E2 –> C (Note that A, B, and C are molecules in the pathway, E1 is enzyme

MAVERICK [17]

Answer:

The compound that will accumulate is B.

Explanation:

Enzymes in any biochemical process are the protein molecules that speed up the rate of the biological reaction. It lowers down the activation energy of the reactant molecules.

Since from the question:

A + E1 –> B + E2 –> C

Given that A, B and C are the molecules in the pathway and E1 and E2 are the enzymes.

This means that A undergoes some biological reaction in which E1 is acting a catalyst to give B and which further undergoing another biological reaction to give C in the presence of enzyme E2.

Since, E2 is inactive,

A will form B but B will not be able to undergo further reaction and thus, C can not be formed.

Thus A is consumed and C is not formed. The compound that will accumulate is B.

5 0

3 years ago

Scientists discover two new elements, element A and element X, and are able to determine their atomic mass. Element A has an ato

olga nikolaevna [1]

17+76×3=228+17=245. D is right

5 0

3 years ago

We both have 10 neutrons in our nuclei. What are we?

Goryan [66]