Q: Which of the following is the correct conversion factor to convert 1.5 L to mL?

$$1.5 \\ \mathrm{L} \\times \\frac{1000 \\ \mathrm{mL}}{1 \\ \mathrm{L}}$$

Q: A patient receives 500 Calories from a meal. How many joules of energy did the patient consume? (1 Calorie = 4184 J)

$$2.09 \\times 10^6$ \\ \mathrm{J}$$

Q: Which of the following is the correct formula for calculating the number of neutrons in an isotope?

$$\\text{Number of neutrons} = \\text{mass number} - \\text{atomic number}$$

Question 1

Which of the following statements best describes the difference between a physical property and a chemical property?

Accepted Answer

A physical property can be observed or measured without changing the substance's identity, while a chemical property describes the substance's ability to undergo a specific chemical change.

Question 2

A student measures the mass of a sample as 12.30 g and its volume as 4.1 mL. Using the correct number of significant figures, what is the density of the sample?

Accepted Answer

$$3.0 \ \mathrm{g/mL}$$

Question 3

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 4

Which of the following best describes Dalton's Atomic Theory?

Accepted Answer

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

Question 5

A sample of an element contains 80% isotope A (mass = 10.0 amu) and 20% isotope B (mass = 11.0 amu). What is the average atomic mass of the element?

Accepted Answer

$$10.2 \ \mathrm{amu}$$

Question 6

Which of the following is the correct conversion factor to convert 1.5 L to mL?

Accepted Answer

$$1.5 \ \mathrm{L} \times \frac{1000 \ \mathrm{mL}}{1 \ \mathrm{L}}$$

Question 7

Which of the following best explains the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 8

A patient receives 500 Calories from a meal. How many joules of energy did the patient consume? (1 Calorie = 4184 J)

Accepted Answer

$$2.09 \times 10^6$ \ \mathrm{J}$$

Question 9

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 10

Which of the following is the correct scientific notation for the number 0.00056?

Accepted Answer

$$5.6 \times 10$$^{-4}$$

Question 11

Which of the following best describes how an ion is formed?

Accepted Answer

By gaining or losing electrons

Question 12

A compound contains 40.0 g of sodium, 24.0 g of magnesium, and 16.0 g of oxygen. What is the percent by mass of oxygen in the compound?

Accepted Answer

Question 13

Which of the following best describes the trend in atomic radius across a period in the periodic table?

Accepted Answer

Atomic radius decreases from left to right.

Question 14

A student needs to prepare 250 mL of a 0.50 M NaCl solution. How many moles of NaCl are required?

Accepted Answer

$$0.125 \ \mathrm{mol}$$

Question 15

Which of the following is a correct statement about the nucleus of an atom?

Accepted Answer

The nucleus contains protons and neutrons.

Question 16

Which of the following is the correct formula for calculating the number of neutrons in an isotope?

Accepted Answer

$$\text{Number of neutrons} = \text{mass number} - \text{atomic number}$$

Question 17

Which of the following best describes the difference between an element and a compound?

Accepted Answer

A compound consists of two or more elements chemically combined, while an element is a pure substance made of only one kind of atom.

Question 18

A chemical reaction produces 15.0 g of water from 10.0 g of hydrogen and an unknown amount of oxygen. According to the Law of Conservation of Mass, how many grams of oxygen were used?

Accepted Answer

$$5.0 \ \mathrm{g}$$

Question 19

Which of the following is the correct order of increasing energy for the units: joule, calorie, Calorie?

Accepted Answer

Joule \u003c calorie \u003c Calorie

Introduction to Chemistry: Exam 1 Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard