Q: The average distance from Earth to the Moon is $$384\ \mathrm{Mm}. $$Express this distance in centimeters using scientific notation.

$$3.84 \times 10$$^{10}$$\ \mathrm{cm}$$

Question 1

A laboratory thermometer reads $$36.5\ ^\circ\mathrm{C}$$ for a patient's temperature. What is this temperature in Kelvin?

Accepted Answer

$$309.7\ \mathrm{K}$$

Question 2

A sample of gold absorbs $$200\ \mathrm{J} of $$heat, causing its temperature to rise from $$25.0\ ^\circ\mathrm{C} to$$ $$43.3\ ^\circ\mathrm{C}. If $$the specific heat of gold is $$0.13\ \mathrm{J}/\mathrm{g}^\circ\mathrm{C}$$, what is the mass of the gold sample?

Accepted Answer

$$84.1\ \mathrm{g}$$

Question 3

Which of the following best describes the classification of a smoothie made by blending various fruits and vegetables, resulting in a brown frothy suspension that settles over time?

Accepted Answer

a heterogeneous mixture

Question 4

A Silver-108 isotope is represented as $$^{108}_{47}\mathrm{Ag}. $$How many protons and neutrons does it contain?

Accepted Answer

47 protons and 61 neutrons

Question 5

The average distance from Earth to the Moon is $$384\ \mathrm{Mm}. $$Express this distance in centimeters using scientific notation.

Accepted Answer

$$3.84 	imes 10$$^{10}$$\ \mathrm{cm}$$

Question 6

A patient is treated with Phosphorus-32, a beta emitter with a half-life of $$14.3$$ days. What fraction of the original sample remains after $$57.2$$ days?

Accepted Answer

$$0.0625$$

Question 7

Which of the following is a chemical property of iodine ($$\mathrm{I}_2$$)?

Accepted Answer

It combines with sodium metal to form sodium iodide.

Question 8

Which of the following nuclear reactions is an example of electron capture?

Accepted Answer

$$^{204}_{84}\mathrm{Po} $$+ ^{0}$$_{-1}\mathrm{e} \$$rightarrow ^{204}$$_{83}\mathrm{Bi}$$

Question 9

Which element is a non-metal?

Accepted Answer

Bromine

Question 10

Which form of radiation can be stopped by skin and is not dangerous externally, but is extremely hazardous if ingested or inhaled?

Accepted Answer

alpha particles

Question 11

What is the correct formula for the ionic compound formed from $$\mathrm{Co}^{3+}$$ and $$\mathrm{SO}_4$$^{2-}$$ ions?

Accepted Answer

$$\mathrm{Co}_2(\mathrm{SO}_4)_3$$

Question 12

Which of the following compounds is classified as a molecular compound?

Accepted Answer

$$\mathrm{PBr}_3$$

Question 13

A nuclear equation is given: $$^{238}_{92}\mathrm{U} $$+ ^{12}$$_{6}\mathrm{C} \rightarrow$$ ??? $$+ 4\ ^{1}_{0}\mathrm{n}. $$What is the missing product?

Accepted Answer

$$^{246}_{98}\mathrm{Cf}$$

Question 14

Which element would be expected to have nearly identical chemical properties as chlorine?

Accepted Answer

Fluorine

Question 15

What is the systematic name for the ionic compound with the formula $$\mathrm{Ni}_3\mathrm{P}_2$$?

Accepted Answer

Nickel(II) phosphide

Question 16

A certain isotope has $$34$$ protons, $$36$$ electrons, and $$46$$ neutrons. What is its correct isotope symbol?

Accepted Answer

$$^{80}_{34}\mathrm{Se}^{2-}$$

Question 17

Which metric prefix corresponds to a power of $$10^{-15}$$?

Accepted Answer

femto

Question 18

What is the charge of a single chromium ion in the ionic compound $$\mathrm{Cr}_3\mathrm{N}_2$$?

Accepted Answer

$$2+$$

Question 19

Which of the following statements about Sodium-24 and Carbon-14 is correct?

Accepted Answer

Sodium-24 decays the fastest and is the least stable.

Question 20

How many valence electrons are present in a silicon atom?

Accepted Answer

4

CHEM 1120 Exam 1 Study Guidance – GOB Chemistry Concepts

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