Question:  Arjun and Isla are discussing water molecules. What does it mean when a molecule is said to be “polar”?

In a classroom experiment, Mason and Charlotte are studying water molecules. According to their observations, a hydrogen bond can form between a hydrogen atom of one water molecule and which atom of another water molecule?

Michael and Aria were conducting an experiment in their science class. They observed that when they tried to mix oil and water, the two liquids did not combine. Reading Passage: Water's polarity allows it to dissolve other polar substances very easily. When a polar substance is put in water, the positive ends of its molecules are attracted to the negative ends of the water molecules, and vice versa. The attractions cause the molecules of the new substance to be mixed uniformly with the water molecules. Water dissolves more substances than any other liquid - even the strongest acid! Because of this, it is often called the 'universal solvent.' The dissolving power of water is very important for life on Earth. Wherever water goes, it carries dissolved chemicals, minerals, and nutrients that are used to support living things.  Substances that are not polar like water, for example oil, do not mix into water.  
Question: Which property is responsible for the fact that water and oil do not mix?

Grace and Avery are conducting an experiment in their chemistry class. They are studying the properties of acids and bases. Grace adds an acid to a beaker of water and observes the changes. Reading Passage: In water (H₂O), a small number of the molecules dissociate (split up). Some of the water molecules lose a hydrogen and become hydroxide ions (OH⁻). The "lost" hydrogen ions join up with water molecules to form hydronium ions (H⁺). In pure water, there are an equal number of hydrogen ions and hydroxide ions. The solution is neither acidic or basic.An acid is a substance that donates hydrogen ions. Because of this, when an acid is dissolved in water, the balance between hydrogen ions and hydroxide ions is shifted. Now there are more hydrogen ions than hydroxide ions in the solution. This kind of solution is acidic.A base is a substance that accepts hydrogen ions. When a base is dissolved in water, the balance between hydrogen ions and hydroxide ions shifts the opposite way. Because the base "soaks up" hydrogen ions, the result is a solution with more hydroxide ions than hydrogen ions. This kind of solution is alkaline.Question: When added to water, how does an acid affect the pH and H⁺ concentration?

During a science class, Ava and Zoe were discussing the properties of water. Ava mentioned that water typically has a pH of 7 and therefore is considered neutral. What ions are present in neutral water?

James is conducting an experiment in his chemistry class. According to the figure above, a solution with a pH of 11 is

Mia is conducting an experiment in her science class to determine the pH levels of different solutions. According to the passage, Acidic solutions have a pH that is

During a science experiment, Arjun and Kai observed that polar molecules such as water have

During a science experiment, Jackson observed that a molecule had a partial positive charge on one side and a partial negative charge on the other side. This type of molecule is called a

Arjun and Olivia are discussing what makes water special. Arjun says, "One of the things that makes our planet special is the presence of liquid water. Water is fundamental for all life; without it every living thing would die. It covers about 70% of Earth's surface and it makes up 65-75% of our bodies (82% of our blood is water). Even though water seems boring - no color, taste, or smell - it has amazing properties that make it necessary for supporting life."
Olivia adds, "The chemical composition of water is H2O - two hydrogen atoms and one oxygen atom. Water has special properties because of the way these atoms bond together to form a water molecule, and the way the molecules interact with each other. The special arrangement leads to water being a polar molecule."  Question: Water is defined as a polar molecule because ...

pH Values of Some Common Substances
Substance    pH
Hydrochloric acid    1.0
Sulfuric acid    1.2
Tomatoes    4.2
Rainwater    6.2
Pure water    7.0
Sea water    8.5
Ammonium chloride    11.1
Sodium hydroxide    13.0
Figure 2–5
Question: Liam and Evelyn are conducting an experiment. What is the strongest acid listed in Figure 2–5?

Reading Passage: The molecules on the surface of the water are not surrounded by similar molecules on all sides, so they're being pulled only by cohesion from other molecules deep inside. These molecules cohere to each other strongly but adhere to the other medium weakly. One example of this is the way that water beads up on waxy surfaces, such as leaves or waxed cars. Yet, it is hard to break through the surface of liquid water. Question: During a science experiment, Olivia observed that small insects such as water striders can walk on liquid water. The reason for this is due to water's

Reading Passage: Water molecules have unusual chemical and physical properties. Water can exist in all three states of matter at the same time: liquid, gas, and solid.  Imagine that you’re sitting in your hot tub (filled with liquid water) watching the steam (gas) rise from the surface as you enjoy a cold drink from a glass filled with ice (solid) cubes. Very few other chemical substances can exist in all these physical states in this close of a temperature range. It is no wonder why water is essential for life. Its special properties make water the single most important molecule in plant life. Sophia and Mason are discussing this phenomenon. Question: Which of the following properties of water enables water molecules to stick to one another?

Statement: During a summer day, Benjamin and Emma noticed that the temperature of the lake near their house remained relatively stable, even though the air temperature fluctuated significantly. Water can absorb a large amount of energy without a large rise in temperature. Question: This is called _________________. As the sun shines on bodies of water, they absorb great amounts of its energy without a large fluctuation in temperature.

During a science class, Scarlett and Benjamin were discussing why ice stays at the top of oceans instead of sinking to the bottom. They learned that polar ice caps are dome-shaped sheets of ice found near the North and South Poles. These ice caps form because high-latitude polar regions receive less heat from the sun than other areas on Earth. As a result, average temperatures at the poles can be very cold. The polar ice caps contain the majority of Earth’s supply of freshwater. In fact, scientists estimate that 70 percent of Earth’s freshwater supply remains in an ice sheet at the South Pole. Why does ice stay at the top of oceans instead of sinking to the bottom?

Evelyn and Isla are conducting an experiment in their science class. They observe that water is often called the "universal solvent" because many substances can be dissolved in water. What property of water allows it to be such a versatile solvent?

Emma and Noah are conducting an experiment to understand which property of water allows it to dissolve many substances. Which of the following properties should they focus on?

Avery and Maya are conducting an experiment in their science class. They notice that ice cubes float in a glass of water. What is the primary reason that ice floats on water?

During a science experiment, Abigail and Ethan observed that water took a long time to heat up compared to other liquids. Which property of water is responsible for its high specific heat?