Which of these statements correctly describes an intensive property of a sample of material in a lab investigation?

The boiling point of the material is 56°C.

The mass of the material is 153 g.

The volume of the material is 193 mL.

The temperature of the material is 26°C.

After Jimmy placed raw potato slices and hydrogen peroxide (H₂O₂) in a plastic bag, he concluded that an exothermic reaction had taken place. Which of the following supports Jimmy's conclusion?

The hydrogen peroxide (H₂O₂) bubbled .

The chemical equation for the decomposition of silver chloride is: 2AgCl (s) + energy → 2Ag (s) + Cl 2(g) Which statement is correct based on this equation?

The reaction is endothermic because energy was needed to break the chemical bonds in AgCl .

The reaction is exothermic because energy was needed to break the chemical bonds in AgCl .

The reaction is exothermic because energy was needed to form the bonds in Ag and Cl 2 .

The reaction is endothermic because energy was needed to form the bonds in Ag and Cl 2 .

Hydrogen peroxide (H 2 O 2 ) decomposes into water (H 2 O) and oxygen gas (O 2 ). Hydrogen peroxide is a liquid that is stored in dark-colored bottles in a cool location . Which of these is the most likely reason for storing hydrogen peroxide in this way ?

Hydrogen peroxide breaks down quickly when exposed to light.

Exposure to light promotes the formation of hydrogen gas (H 2 ) instead of oxygen gas.

Exposure to light allows bacteria to grow in the hydrogen peroxide.

Hydrogen peroxide forms crystals when warmed .

The rate of a reaction depends on many factors such as the concentration of the reactants. Which of the following explains why an increase in the concentration of reactants affects the rate of reaction ?

The collisions increase between the reactants.

The activation energy is lowered .

There are fewer molecules present .

Which statement defines the role of activation energy ?

Activation energy is the minimum energy needed to start a reaction .

Activation energy is energy that causes a reaction rate to increase .

Activation energy is energy that causes a reaction rate to decrease .

Activation energy is the minimum energy needed to complete a reaction .

Which occurs in a fusion reaction between two atoms?

A new element is formed and energy is released.

Energy is absorbed as a less stable element forms.

Energy is converted into mass and forms a heavier element.

The nuclei of the atoms are split apart and energy is released.

When carbon and helium atoms undergo fusion, oxygen and one neutron are produced. The total mass of the products is less than the total mass of the carbon and helium that combine. Which statement best explains the decrease in the total mass?

The difference in mass was transformed into energy.

Two atoms are combined to form one atom.

Some of the mass is lost as undetectable particles.

Some of the mass was used up during the reaction.

The equation shows a reaction at equilibrium. 3H 2(g) + N 2(g) ⇌ 2NH 3(g) + 92 kJ. Which of the following describes what happens if NH 3 is added to the system?

Equilibrium is restored as the reaction shifts toward the reactants .

Equilibrium is restored as the reaction shifts toward the products .

C. Equilibrium is restored as more heat energy is released from the system.

D. Equilibrium is restored as the concentration is increased to the products .

What distinguishes a conductor from an insulator?

the ease of flow of electrons through the material

the rate that neutrons travel through the material

the amount of electrons present

The diagram shows temperatures and phase changes for water as heat is added at a steady rate. Which statement best explains why the temperature remains constant when adding heat to a mixture of water and steam?

The heat energy is changed into potential thermal energy in the phase change.

The heat causes the water molecules to decrease in speed.

The heat is absorbed by water and steam releases it into the air.

The heat energy is used to break the water molecules into hydrogen and oxygen gas.

What causes the emission spectrum of an element?

movement of electrons from a high energy state to a lower energy state

movement of electrons from a lower energy state to a higher energy state

movement of photons from a lower energy state to a higher energy state

movement of photons from a high energy state to a lower energy state

Chemistry EOY Practice

Authored by Melissa Laureigh

Chemistry

11th Grade

NGSS covered

Used 14+ times

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MULTIPLE CHOICE QUESTION

2 mins • 2 pts

Elements with the same valence electron configuration can be expected to have similar

atomic mass.

chemical reactivity.

numbers of protons.

numbers of electrons.

A neutral chlorine (Cl) atom contains 17 protons and 18 neutrons. How many electrons are there in a chlorine ion (Cl⁻)?

MULTIPLE CHOICE QUESTION

2 mins • 2 pts

Which element has 2 electrons in the outermost energy level?

cesium (Cs)

magnesium (Mg)

boron (B)

argon (Ar)

What is the chemical formula of copper (II) sulfate?

CuSO₄

Cu₂SO₄

Cu(SO₄)₂

Cu₂(SO₄)₂

MULTIPLE CHOICE QUESTION

2 mins • 2 pts

Compounds can be classified as covalent or ionic by noting the location on the periodic table for each atom in the compound. Which compound is covalently bonded?

sodium chloride (NaCl)

sulfur dioxide (SO₂)

potassium bromide (KBr)

magnesium chloride (MgCl₂)

MULTIPLE CHOICE QUESTION

2 mins • 2 pts

The ions in calcium chloride dissociate (breaks apart) in the presence of water. What is the cation that is produced in this reaction?

hydrogen (H⁺)

oxygen (O⁻²)

calcium (Ca⁺²)

chlorine (Cl⁻)

Metallic bonding allows relatively free movement of electrons between atoms. This bonding results in the malleability of substances. A sample of which substance would most likely exhibit malleability?

ozone (O₃)

copper (Cu)

sodium chloride (NaCl)

hydrogen peroxide (H₂O₂)

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Chemistry EOY Practice

Elements with the same valence electron configuration can be expected to have similar

A neutral chlorine (Cl) atom contains 17 protons and 18 neutrons. How many electrons are there in a chlorine ion (Cl⁻)?

Which element has 2 electrons in the outermost energy level?

What is the chemical formula of copper (II) sulfate?

Compounds can be classified as covalent or ionic by noting the location on the periodic table for each atom in the compound. Which compound is covalently bonded?

The ions in calcium chloride dissociate (breaks apart) in the presence of water. What is the cation that is produced in this reaction?

Metallic bonding allows relatively free movement of electrons between atoms. This bonding results in the malleability of substances. A sample of which substance would most likely exhibit malleability?

Oxygen atoms have an electronegativity value of 3.44, and carbon atoms have an electronegativity value of 2.55. What type of bond forms between carbon and oxygen?

Which of these statements correctly describes an intensive property of a sample of material in a lab investigation?

After Jimmy placed raw potato slices and hydrogen peroxide (H₂O₂) in a plastic bag, he concluded that an exothermic reaction had taken place. Which of the following supports Jimmy's conclusion?

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