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?

• 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.

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

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

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

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

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.

(a)  

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.

• 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

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 -

(a)  

Tags

NGSS.HS-PS3-4

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

• 200 J

• 499.98 J

• 215 J

• 284.6 J

Tags

NGSS.HS-PS3-4

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.

• Second law of thermodynamics
• First law of thermodynamics
• Third law of thermodynamics
• Zeroth law of thermodynamics

Tags

NGSS.HS-PS3-4