HESI Practice Test 1 Chemistry

Which of the following reasons must researchers consider the placebo effect?

Which of the following steps of the scientific method relies on logic reasoning to be formulated?

Which of the following terms is used interchangeably with negative variation?

Look at the following image. Which of the following measuring tools are used?

Light travels at a speed of almost 3 × 10⁵ kilometers per second. How is this value written in standard notation?

Which of the following statements describes the mass of an electron?

Which of the following parts of an atom takes up the most space in terms of area?

A neutral atom of aluminum has 13 electrons. How many electrons can be found in each shell in the electron cloud?

Which of the following is part of the metric system?

Which of the following is the Celsius value for 85K?

A patient has a fever of 105°C. Which of the following is this value in Fahrenheit?

What is the temperature of 35°C in Kelvin?

Given the heating curve of iron, what are the approximate melting and boiling points?

Compare the boiling points of the alcohols in the table below. Molecules of these alcohols are similar, but they have different numbers of carbon atoms in a chain and, therefore, different masses. Based on the boiling point data in the table, what conclusion can be drawn about the relationship between the number of carbon atoms in a molecule and the interaction of the molecules?

A student is recording the temperature of a solid substance as he heats it over a Bunsen burner and notices that the temperature stays constant at 62°C for four minutes. How can the substance be described during these four minutes?

Flammability is an example of a _____.

The process of diffusion of water molecules through a membrane in the direction of higher solute concentration describes which of the following?

In the Lewis structure for carbon dioxide shown below, how many electrons is the carbon atom sharing with one oxygen atom?

Consider the carbon-carbon bonds that exist in the molecules shown below.

Which of the compounds below contains the strongest carbon-carbon bond?

According to the Lewis structure below, what is the formula for methanol?

In which reaction are both the reactants and the products heterogeneous mixtures? 

In the following single-replacement reaction, ______ replaces ______.

Cl₂ + 2NaI → 2NaCl + I₂

What solution has a pH of 7?

An acid that dissociates into hydrogen ions is defined as which of the following?

What is the conjugate base of sulfuric acid?