A farmer’s fruit storage cellar is unheated. To prevent the fruit from freezing, the farmer places a barrel of water in the cellar. Explain why this helps prevent the fruit from freezing.

Solve and check. $7 = m \div 21$

How much heat is stored in $10 \mathrm{kg}$ of water at $95^{\circ} \mathrm{C}$? (a)$42,000 \mathrm{J}$ (b)$399,000 \mathrm{J}$ (c) Zero; heat is not energy but is a process for transferring thermal energy.

We define the specific heat of a material as the energy that must be transferred to $1.0 \mathrm{kg}$ of that material in order to cause it to warm $1.0^{\circ} \mathrm{C}$. What happens to the specific heat if we transfer twice that much energy? (a) The specific heat doubles. (b) The specific heat halves. (c) The specific heat does not change.

Dublin, Ireland and Edmonton, Alberta, Canada are at the same latitude $\left(53.5^{\circ}\right)$. The January and July average temperatures in Dublin are $5^{\circ} \mathrm{C}$ and $16^{\circ} \mathrm{C}$, respectively; in Edmonton they are $-12^{\circ} \mathrm{C}$ and $21^{\circ} \mathrm{C}$, respectively. Why is the temperature variation so much greater in Edmonton than in Dublin? (a) Dublin and Edmonton are in different hemispheres. (b) Dublin is a bigger city. (c) Dublin is on the ocean.

Consider a planet where the pressure of the atmosphere at sea level is 2500 mmHg. Does water behave in a way that can sustain life on the planet?

Which of the following statements is not true about tobacco use? (a) About 20 percent of deaths from cardiovascular disease are smoking related. (b) People who smoke less than a pack a day are generally safe from cardiovascular disease. (c) Cardiovascular disease can be caused by exposure to secondhand smoke. (d) For teens, tobacco use is the number one risk factor for cardiovascular disease.

Explain the differences between each set of vocabulary words given below. Then explain how the words are related. pH—buffer

The weight of a radioactive isotope remaining after t weeks is given by $W_{t}=8000 \times e^{-\frac{t}{20}}$ grams. Find the time for the weight to: reach 0.1% of its original value.

A solution of $\mathrm{KClO}_{3}$ is prepared using 75 grams of the solute in enough water to make 0.250 liters of solution. The gram-formula mass of $\mathrm{KClO}_{3}$ is 122 grams per mole. Assuming the solution is saturated, determine the temperature of the solution.

Determine whether the given expression is a polynomial ll it is, write it in standard form. $2 x ^ { 2 } - \sqrt { 3 } x + 4$

An insulated beaker with negligible mass contains 0.250 kg of water at $75.0^{\circ} \mathrm{C}$. How many kilograms of ice at $-20.0^{\circ} C$ must be dropped into the water to make the final temperature of the system $40.0^{\circ} \mathrm{C}$?

Write equivalent expression. $35x+30$

A lightning flash releases about $10^{10} \mathrm{J}$ of electrical energy. If all this energy is added to $50 \mathrm{kg}$ of water (the amount of water in a $165-1 b$ person) at $37^{\circ} \mathrm{C}$, what are the final state and temperature of the water?