Which statement is true about the reaction?

absorbed 25 kJ/mol of heat and is endothermic

released 75 kJ/mol of heat and is endothermic

released 75 kJ/mol of heat and is exothermic

absorbed 25 kJ/mol of heat and is exothermic

The energy of violet light is approximately twice that of red light. How do the wavelengths of violet and red light compare?

Violet light has a shorter wavelength than red light.

Violet light has a longer wavelength than red light.

Violet and red light have the same wavelength.

Violet light has a wavelength that is equal to blue light.

The table shows the mass and abundance of three isotopes of element J. Which setup would calculate the average atomic mass of element J correctly?

(mass Z x 0.15) + (mass Y x 0.50) + (mass W x 0.35) = Average Atomic Mass of J

(mass Z + 0.15) + (mass Y + 0.50) + (mass W + 0.35) = Average Atomic Mass of J

15 + 50 + 35/3 = Average Atomic Mass of J

Mass Z + Mass Y + Mass W/3 = Average Atomic Mass of J

Two samples of hot water are used for a thermodynamics lab. Students get one sample from the hot water tap and one sample of boiling water from a hot plate. Both samples are held in doubled, foam coffee cups. Both samples contain approximately the same volume of water. A thermometer is placed in each cup, and the students measure the temperature of both samples every 30 seconds. The graph is produced from the data. Which of the following conclusions best represents the trends seen in this data?

The hot water sample cools at a faster rate than the warm sample.

The boiling water sample maintains heat while the hot water cools more quickly.

Both samples maintain a constant temperature throughout the experiment.

The warm water (tap) sample starts at a higher temperature and cools down quicker than the hot (boiling) sample.

According to the energy diagram, is the decomposition of CaCO 3 an exothermic or an endothermic reaction?

Endothermic. The diagram shows that the energy or heat content of the reactant is less than the heat content of the products. Enthalpy change is POSITIVE.

Exothermic. The diagram shows that the energy or heat content of the reactant is more than the heat content of the products. Enthalpy change is NEGATIVE.

Students designed an experiment to determine the amount of calories in a Flamin' Hot Cheeto. A ring stand was used with a clean aluminum soda can hung from the ring that was partially filled with a known mass of water. A thermometer was placed inside the can so that it measured the temperature of the water but did not touch any part of the metal can. Once set-up was complete, an initial water temperature was taken. The Cheeto was then lit on fire and allowed to completely burn. The final temperature of the water was measured. What is a correct observation about the transfer of heat in this experiment?

The students can use the temperature change of the water, the mass of the Cheeto, and the heat gained or lost to determine the calories in the Cheeto.

The radiation of the heat from the Cheeto escapes into the atmosphere.

Conduction currents in the can are heated by the Cheeto.

Phase changes, conduction, and energy being created cause the heat to be transferred from the Cheeto into the can of water.

The balanced equation for the combustion of acetylene is shown below: 2C 2 H 2 (g) + 5O 2 ---> 4CO 2 (g) + 2H 2 O (g) The sum of the heat of formation of the reactants for this reaction is +454kJ, while the sum of the heat of formation for the products is -2511.6 kJ. Based on the 1st law of thermodynamics, this indicates that 2511.6 kJ of energy -

was released to the surroundings during this reaction.

was stored as potential energy during this reaction.

is converted into kinetic energy.

Which of the following equations is an exothermic reaction?

H 2 (g) + 1/2 O 2 (g) --> H 2 O (L) ΔH= -285.8 kJ

HgO (s) --> Hg (L) 1/2 O 2 (g) ΔH= +90.7 kJ

4CO 2 (g) + 6 H 2 O (L) --> 2C 2 H 6 (g) + 7 O 2 (g) ΔH= +3120 kJ

SO 2 (g) --> S (s) + O 2 (g) ΔH= +296 kJ

Chem. DA Review

Authored by Sabrina Gonzalez

Chemistry

10th Grade

NGSS covered

Used 3+ times

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

Ernest Rutherford bombarded thin gold foil with high speed, positively-charged alpha particles. He found that most of the particles passed through, but a few bounced back off the foil. What can be concluded of the internal structure of the atom?

Alpha particles are negatively charged and attract the nucleus.

The nucleus is large and occupies most of the atom's volume.

Atoms are completely solid with no empty space.

Atoms have a small, dense nucleus surrounded by mostly empty space.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which of the following is NOT a postulate in Dalton's Atomic Theory?

I. All matter consists of divisible particles called atoms.

II. Atoms of the same element are identical in mass and properties.

III. Atoms cannot be created or destroyed.

IV. Compounds are formed by a combination of two or more different kinds of atoms.

Tags

NGSS.HS-PS1-7

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best completes the statement about the structure of an atom?
A core of ___ and _ grouped together surrounded by _____?

protons, neutrons, electrons

quarks, leptons, bosons

neutrons, electrons, positrons

protons, electrons, neutrons

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An electrically neutral atom consists of 14 neutrons, 13 electrons, and a number of protons. What element is being described?

Aluminum

Iron

Magnesium

Silicon

Tags

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Any atom that is electrically neutral must contain -

equal numbers of protons and electrons

equal numbers of neutrons and electrons

more electrons than neutrons

more protons than electrons

Tags

NGSS.MS-PS1-1

FILL IN THE BLANK QUESTION

1 min • 1 pt

Lead is known to contain three isotopes: 23.5% of the sample has a mass of 204 AMU, 24.1% has a mass of of 207 AMU, and 52.4% has a mass of 208 AMU. What is the average atomic mass of lead?
Enter the correct answer below. Round to the nearest tenth.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Given that h = 6.626 x 10^-34and E = hf, what is the frequency of light that has an energy of 3.15 x 10^-19J? Round your answer to the nearest hundredth.

3.00 x 10^14

5.00 x 10^14

2.50 x 10^14

4.75 x 10^14

Tags

NGSS.HS-PS4-1

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Chem. DA Review

Ernest Rutherford bombarded thin gold foil with high speed, positively-charged alpha particles. He found that most of the particles passed through, but a few bounced back off the foil. What can be concluded of the internal structure of the atom?

Which of the following is NOT a postulate in Dalton's Atomic Theory?

Which of the following best completes the statement about the structure of an atom?
A core of ___ and _ grouped together surrounded by _____?

An electrically neutral atom consists of 14 neutrons, 13 electrons, and a number of protons. What element is being described?

Any atom that is electrically neutral must contain -

Lead is known to contain three isotopes: 23.5% of the sample has a mass of 204 AMU, 24.1% has a mass of of 207 AMU, and 52.4% has a mass of 208 AMU. What is the average atomic mass of lead?
Enter the correct answer below. Round to the nearest tenth.

Given that h = 6.626 x 10^-34and E = hf, what is the frequency of light that has an energy of 3.15 x 10^-19J? Round your answer to the nearest hundredth.

A student mixed 100 mL of water at 20 °C with 100 mL of water at 80 °C. He briefly stirred the mixture for 10 seconds and measured the temperature. The measured temperature of the mixture of water was -

Carbon tetrachloride was commonly used as an organic solvent until it was found to be carcinogenic. How much heat is required to raise the temperature of 10.35 g CCl₄from 32.1 °C to 56.4 °C?
The specific heat of CCl₄is 0.85651 J/g°C

Which law of thermodynamics applies to the situation below?
A can of cold soda is placed on a counter and eventually becomes the same temperature as the air.

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Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

Chem. DA Review

Ernest Rutherford bombarded thin gold foil with high speed, positively-charged alpha particles. He found that most of the particles passed through, but a few bounced back off the foil. What can be concluded of the internal structure of the atom?

Which of the following is NOT a postulate in Dalton's Atomic Theory?

Which of the following best completes the statement about the structure of an atom?A core of _______ and _______ grouped together surrounded by _______?

An electrically neutral atom consists of 14 neutrons, 13 electrons, and a number of protons. What element is being described?

Any atom that is electrically neutral must contain -

Lead is known to contain three isotopes: 23.5% of the sample has a mass of 204 AMU, 24.1% has a mass of of 207 AMU, and 52.4% has a mass of 208 AMU. What is the average atomic mass of lead?Enter the correct answer below. Round to the nearest tenth.

Given that h = 6.626 x 10-34 and E = hf, what is the frequency of light that has an energy of 3.15 x 10-19 J? Round your answer to the nearest hundredth.

A student mixed 100 mL of water at 20 °C with 100 mL of water at 80 °C. He briefly stirred the mixture for 10 seconds and measured the temperature. The measured temperature of the mixture of water was -

Carbon tetrachloride was commonly used as an organic solvent until it was found to be carcinogenic. How much heat is required to raise the temperature of 10.35 g CCl4 from 32.1 °C to 56.4 °C?The specific heat of CCl4 is 0.85651 J/g°C

Which law of thermodynamics applies to the situation below?A can of cold soda is placed on a counter and eventually becomes the same temperature as the air.

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

Which of the following best completes the statement about the structure of an atom?
A core of ___ and _ grouped together surrounded by _____?

Lead is known to contain three isotopes: 23.5% of the sample has a mass of 204 AMU, 24.1% has a mass of of 207 AMU, and 52.4% has a mass of 208 AMU. What is the average atomic mass of lead?
Enter the correct answer below. Round to the nearest tenth.

Given that h = 6.626 x 10^-34and E = hf, what is the frequency of light that has an energy of 3.15 x 10^-19J? Round your answer to the nearest hundredth.

Carbon tetrachloride was commonly used as an organic solvent until it was found to be carcinogenic. How much heat is required to raise the temperature of 10.35 g CCl₄from 32.1 °C to 56.4 °C?
The specific heat of CCl₄is 0.85651 J/g°C

Which law of thermodynamics applies to the situation below?
A can of cold soda is placed on a counter and eventually becomes the same temperature as the air.