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physics/astronomy homework

Question # 00601513
Subject: Astronomy
Due on: 10/10/2017
Posted On: 10/10/2017 02:42 AM
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Question 1 

In ionic bonding, electrons _____ .

play no role

are shared between atoms

are transferred between atoms

Question 2 

Groups on the periodic table list elements with similar properties.

true/false

Question 3 

Which of the following amounts is closest to the molar mass of C18H25NO?

128.44 g

1.30 lbs

200 g

1.9419 kg

Question 4 

____ are examples of transition metals.

calcium and magnesium

carbon and hydrogen

iron and nickel

sodium and chlorine

Question 5 

Elements in the same period on the Periodic Table will have the ____ .

same number of electrons

same number of protons

increasing number of protons as they move across the period

decreasing number of protons as they move across the period

Question 6 

The ion Cl- is an example of ____ .

an atom

a cation

a molecule

an anion

Question 7 

If an asteroid fragment contains carbon, it may burn when entering Earth's atmosphere. The most likely compound to result from this process is ______ . The type of chemical bond resulting from this process is a ______ bond. Of the types of chemical reactions studied in this course, this would this be a ______ reaction.

carbon monoxide, covalent, acid base

carbon dioxide, covalent, exothermic

methane, ionic, endothermic

ammonia, ionic, redox

Question 8 

Isotopes of an element have the same number of _____ .

protons but different numbers of neutrons

protons and neutrons

neutrons and electrons

neutrons but different numbers of protons

Question 9 

In covalent bonding, electrons are _____ atoms.

shared between

expelled from

transferred between

Question 10 

The formula of the ionic compound that forms from two ions, A2+ and R7-, can be written as AxRy. What is the value for x?

Only enter your numerical answer for x below. Your answer must be a whole number.

Answer:

Question 11 

A specific radioactive isotope has a half-life of 27.2 minutes. How long will it take this isotope to decay to 1/8 of its original amount?

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Answer:

Question 12 

Two short-lived isotopes of an element are produced in a nuclear reaction. One of these isotopes has a mass of 5.3731 amu and accounts for 75.5% of the production. The remaining other isotope has a mass of 7.3904 amu. Use this information to calculate the atomic mass of this element.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.


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physics/astronomy quiz 5

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Posted On: 10/10/2017 02:51 AM
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