chem hesi a2 pt 1 set

Which of the following is not a polysaccharide?

Cellulose

Glucose

Starches

Glycogen

Glucose

What percentage of an original sample of iodine-131 will remain after 64 days if iodine-131 has a half-life of 8 days?

0.39%

25%

6.25%

12.5%

0.39

When ethylamine is added to water, it creates an alkaline solution. Which of option below would best represent the pH of this solution?

5.0

1.5

11.9

7.0

11.9

Which of the following pairs would result in an acid-base neutralization reaction?

NaHCO₃ + NaBr

H₂ + O₂

NaOH + LiCl

KOH + H₂SO₄

KOH + H₂SO4

Which of the following does pH measure?

The strength of an acid

The concentration of hydrogen ions

Acid concentration

The concentration of hydroxide ions

The concentration of hydrogen ions

During oxidation, what happens to a chemical species?

It loses electrons

It gains one mole of oxygen

It gains electrons

It loses one mole of oxygen

It loses electrons

Which of the following shows a synthesis reaction?

AB + DC → AD + BC

AB → A+ + B-

A + B → AB

AB → A + B

A + B → AB

What atom property determines if a bond is polar or non-polar?

Electronegativity

Ionization energy

Polarity

Electron affinity

Electronegativity

Which of the following describes a non-polar covalent bond?

An even sharing of protons between atoms

An even sharing of electrons between atoms

An uneven sharing of electrons between atoms

An uneven sharing of protons between atoms

An even sharing of electrons between atoms

A chemist wants to make 5 L of a solution of NaCl that has a molarity of 0.5. How many moles of NaCl do they need

25 moles

1.25 moles

5.0 moles

2.5 moles

2.5 moles

Which of the following is not an example of an alloy?

A mixture of bromine and oxygen

A mixture of iron and lead

A mixture of copper and aluminum

A mixture of silver and gold

A mixture of bromine and oxygen

Which of the following best describes what occurs when an equilibrium is established in a reaction?’

The catalyst is fully consumed, terminating the reaction.

All reagents have been consumed.

The rate of the forward reaction is equal to the rate of the reverse reaction.

All products have precipitated from the solution.

The rate of the forward reaction is equal to the rate of the reverse reaction.

Which of the states of matter have a definite volume?

Gas, liquid, and volume

Gas and solid

Liquid and solid

Gas and liquid

Liquid and solid

How many neutrons are in germanium-62?

62

32

30

31

30

How many electrons does a neutral atom of nitrogen have?

7

8

5

6

7

Which of the following is located in Group 2 of the periodic table?

Barium

Neon

Hydrogen

Lithium

Barium

Which of the following elements is a metal? Strontium

Strontium

Helium

Bromine

Neon

Strontium

Which of the following is the atomic number for the element francium?

87

223

88

348

87

Which of the following best describes a cation?

An atom that has more neutrons than protons

An atom with a negative charge

An atom that has more electrons than protons

An atom that has more protons than electrons

An atom that has more protons than electrons

Which subatomic particle has a positive charge?

Protons

Electrons

Neutrons

Photons

Protons

Which of the following orbits the nucleus of an atom?

Electron

Gamma particle

Neutron

Proton

Electron

Scientific notation is used by scientists to write very large and very small numbers. Which option correctly represents the scientific notation of 0.000001846?

18.46 x 10-5

1.846 × 106

1.846 × 10-5

1.846 × 10-6

1.846 × 10⁻⁶

Which of the following is correct?

0 Kelvin = -273.15 degrees Celsius

0 kelvin = 32 degrees Celsius

273.15 Kelvin = 100 degrees Celsius

100 Kelvin = 0 degrees Celsius

0 Kelvin = −273.15 degrees Celsius

Which of the following is the SI unit of length?

Kilometer

Meter

Feet

Inches

Meter

Normal body temperature is considered to be 98.6oF. What is the normal body temperature in degrees Celsius?

37° C

21° C

32° F

100° C

37° C

Which of the following isotopes of iron has 26 protons, 30 neutrons, and 26 electrons?

²⁶Fe

⁵⁵Fe

³⁰Fe

⁵⁶Fe

⁵⁶Fe

What functional group do fatty acids contain?

Amine

Phenols

Hydrochloric acid

Carboxylic acid

Carboxylic acid

Which metric prefix is represented numerically by 10^-3?

milli-

kilo-

centi-

deci-

milli-

Which of the following Kelvin temperatures represents the freezing point of water?

-273.15 K

373.15 K

0 K

273.15 K

273.15K

Which of the following options correctly shows the products between the acid-base reaction between NaOH and HCl?

HCl + H2O

NaHCO3 + H2O

NaCl + H2O

NaOH + H2O

NaCl + H₂O

Which of the following options correctly shows 4,752,100 in scientific notation?

4.7521 x 10⁵

4.7521 x 10^-5

4.7521 x 10⁶

4.7521 x 10^-6

4.7521 × 10⁶

Which of the following is the correct symbol for arsenic?

As

Al

Ar

At

As

Which intermolecular force is the strongest?

Hydrogen bonds

Ionic bonds

Dispersion forces

Dipole-dipole interactions

Ionic bonds

Which of the following is a property of noble gases?

They have a -1 charge

They are highly reactive

They have a full octet of valence electrons

They are easily ionized

They have a full octet of valence electrons

Which of the following represents a normal blood pH level?

7.0

7.40

14

7.40

Which option correctly converts 4.51 × 10^-5 to standard notation?

0.00000451

4,510

4,510,000

0.0000451

0.0000451

Which element on the periodic table has 8 protons?

Nitrogen

Boron

Carbon

Oxygen

Oxygen

Which of the following describes a decomposition reaction? Chemicals switch ions

Chemicals are broken apart to form products

Chemicals combine to form products

Chemicals are burned in oxygen

Chemicals are broken apart to form products

Which of the following describes a catalyst?

A gas that evolves from the reaction

A substance that increases the rate of a chemical reaction

A substance that slows down a reaction.

A solid that precipitates out of a reaction

A substance that increases the rate of a chemical reaction

Which of the following occurs during a redox reaction?

The number of electrons in a reaction increases

All chemicals are reduced

All chemicals are oxidized

One species is reduced, while another is oxidized

One species is reduced, while another is oxidized

Which of the following occurs when ice melts?

Water molecules lose kinetic energy.

None of these

Water molecules gain kinetic energy.

The kinetic energy of water molecules does not change.

Water molecules gain kinetic energy

Which of the following subatomic particles are located in the nucleus?

Protons and neutrons

Electrons and neutrons

Positrons and electrons

Protons, neutrons, and electrons

Protons and neutrons

What type of bonding exists in NaCl?

Stoic

Isotopic

Ionic

Synthetic

Ionic

Which element does the electron configuration 1s² 2s² 2p⁴represent?

Carbon

Oxygen

Nitrogen

Fluorine

Oxygen

Which of the following is not a simple sugar?

Dextrose

Glucose

Fructose

Glycogen

Glycogen

F-21 has a half-life of 5 seconds. How long will it take a 50 g sample of F-21 to decay to a mass of 12.5 g?

25s

20s

15s

10s

10s

When methane (CH₄) is heated in the presence of oxygen, water and CO₂ are produced. What type of reaction is this?

Double replacement

Decomposition

Synthesis

Combustion

Combustion

Which state of matter can contain a solution?

Solids and liquids

Liquids and gases

Solids, liquids, and gases

Gases and solids

Solids, liquids, and gases

When brass is created by mixing zinc and copper, what type of solution is created?

Liquid-liquid

Compound

Alloy

Emulsion

Alloy

What is the name given to a negatively-charged atom?

Ion

Anion

Cation

Isotope

Anion