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3 years ago

(12) Magnesium metal burns very brightly to produce heat and a white solid.

Chemistry

1 answer:

hjlf3 years ago

5 0

Answer:

exothermic

Explanation:

heat/energy is released when it burns.

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Enter your answer in the provided box. The atomic masses of 63Cu (69.17 percent) and 65Cu (30.83 percent) are 62.94 and 64.93 am

dybincka [34]

Answer: The average atomic mass of copper is 63.55 amu.

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

For $_{29}^{63}\textrm{Cu}$ isotope:

Mass of $_{29}^{63}\textrm{Cu}$ isotope = 62.94 amu

Percentage abundance of $_{29}^{63}\textrm{Cu}$ = 69.17 %

Fractional abundance of $_{29}^{63}\textrm{Cu}$ isotope = 0.6917

For $_{29}^{65}\textrm{Cu}$ isotope:

Mass of $_{29}^{65}\textrm{Cu}$ isotope = 64.93 amu

Percentage abundance of $_{29}^{65}\textrm{Cu}$ = 30.83 %

Fractional abundance of $_{29}^{65}\textrm{Cu}$ isotope = 0.3083

Putting values in equation 1, we get:

$\text{Average atomic mass of Copper}=[(62.94\times 0.6917)+(64.93\times 0.3083)]\\\\\text{Average atomic mass of copper}=63.55amu$

Hence, the average atomic mass of copper is 63.55 amu.

4 0

3 years ago

which conversion factor do you use first to calculate the number of grams of fecl3 produced by the reaction of 30.3 g of fe with

Alexeev081 [22]

Answer:

Explanation:

8 0

3 years ago

True or false: environmental science concentrates on the study of earth's natural hazards.

algol [13]

The correct answer for this question is 'False'

Environmental science is not the study of the earth's natural hazards

What is Environmental science?

Environmental Science is the study of physical, chemical, biological components of earth's natural environment they include air, water etc.,

The Environmental science closely studies the human impact on the earth's environment.

This field of science also helps us to know about how science effects our environment.

And the 3 main aspects of Environmental science are:

To understand the interaction between humans and environment

To understand how natural world works

To Find a way to deal with the environmental problems to live sustainably.

To know more about environmental science, click here:

brainly.com/question/13254058

#SPJ4

8 0

2 years ago

What is the mole ratio of d to a in the generic chemical reaction 2a+b-- c+3d?

barxatty [35]

Answer: D : A is 3 : 2.

Explanation:

The law of definite proportion is being used here. The law states that a given compound always has the same proportion of its constituent elements by mass.

2a + b = c + 3d

This actually means that, two moles of “a” react with a mole of “b” to produce a mole of “c” and 3 moles of “d”

Using the concept of stoichiometry coefficients of d and a

d:a = 3:2

6 0

3 years ago

Read 2 more answers

What type of energy transformation takes place during cellular respiration?

kirill [66]

Answer:

chemical energy transgormation takes place during cellular respiration

8 0

3 years ago