Almost done
Ice cubes are left out on a surface long enough to begin to melt into liquid water. The ice cubes have not melted completely.
Which claim most accurately describes the temperature of the newly formed liquid water?
around freezing temperature, because the ice cubes are still present
around room temperature, because water is a liquid at room temperature
around half-way between freezing and room temperature, because the ice cubes are about half-way melted
around freezing temperature, because the ice cubes are still present
5 grams of salt are dissolved in a container of water to form a saltwater solution.
Over the next few days, the water completely evaporates from the container.
How much salt is leftover in the container?
5 grams
17. Which of the following procedures would best measure how stirring affects the rate that sugar particles dissolve in water?
A. Step 1) Start with 1 cup of water.
Step 2) Measure the temperature of the water.
Step 3) Add sugar to the water.
Step 4) Measure the temperature of the water again.
Step 5) Observe how much sugar dissolves in the water.
B. Step 1) Start with two identical cups of water.
Step 2) Add the same amount of sugar to the water in each cup.
Step 3) Stir the sugar into the water in Cup A.
Step 4) Let the sugar in Cup B settle in the water to the bottom.
Step 5) Observe how much sugar dissolves in each cup.
C. Step 1) Start with two identical cups of water.
Step 2) Add a large cube of sugar to Cup A.
Step 3) Add small particles of sugar to Cup B.
Step 4) Stir both cups at the same rate.
Step 5) Observe how much sugar dissolves in each cup.
B. Step 1) Start with two identical cups of water.
Step 2) Add the same amount of sugar to the water in each cup.
Step 3) Stir the sugar into the water in Cup A.
Step 4) Let the sugar in Cup B settle in the water to the bottom.
Step 5) Observe how much sugar dissolves in each cup.
During the Antebellum period, _________ ( Responses: West, Middle, East) _________ Tennessee depended on slavery to harvest crops.
west
Different substances have different freezing and boiling points. These values help scientists know when phase changes happen.
Phosphorus
In another classroom experiment, students placed 100 grams of water in one beaker and 100 grams of an unknown liquid called Liquid X in another beaker. They left both beakers on a table and weighed them every day. Below is a graph showing the data over five days.
What conclusion can be made from the graph?
Water evaporates more slowly than Liquid X.
Water evaporates more quickly than Liquid X.
Water did not evaporate at all, but Liquid X did.
Water and Liquid X evaporate at the same rate.
Water evaporates more slowly than Liquid X.
A student is designing a process to study the fastest way to dissolve sugar in tea. The student uses 50 milliliters of tea and adds 50 grams of sugar cubes for each trial. The student waits two minutes before making the observations shown in the table below
How can this experiment be changed to be sure that as much sugar as possible has dissolved?
Use a larger cup to hold the 50°C tea.
Use larger sugar cubes in the 40°C tea.
Use less water at all three temperature
Stir the tea constantly at all three temperatures.
Stir the teat constantly at all three temperatures
Students put solid butter and solid water on a table. The air temperature around the table is 20°C.
Which statement accurately describes the most likely state of each substance after 2 hours on the table?
The butter will remain a solid, and the water will become a liquid
A student sets up an investigation to measure the temperature when ice melts to liquid water.
What reason best explains why the temperature of the water is 32°F (0°C) in two of the pictures?
The ice will keep the water around 32°F (0°C) until the ice completely melts.
A glass contains 400 grams of water. A student puts 40 grams of sugar in the water. The student then stirs the water until the sugar is no longer visible.
What is the mass of the solution in the glass?
440 grams
A glass of ice water is placed on a table inside a room that is at room temperature. After a few minutes, the ice inside the glass melts. The diagram below shows the changes observed as the ice melts.
The contents of the glass are wet before and after the ice melts.
The combined mass of the glass and its contents is less after the ice melts.
The contents of the glass stay the same color before and after the ice melts.
The combined mass of the glass and its contents is the same before and after the ice melts.
The combined mass of the glass and its contents is the same before and after the ice melts.
A student poured five different clear, colorless liquids into five different beakers. Each beaker was filled halfway with the liquid. The student added 1 gram of a white powder and stirred each mixture. The student's observations are recorded in the table below.
mixture 3 and 5
. In the experiment below, liquid water is heated inside a bottle. A balloon is fitted over the top of the bottle.
After a short time passes, the balloon begins to inflate.
How does the liquid water in the bottle cause the balloon to inflate?
It boils into a hot gas, which rises to fill the balloon.
Which statement is true?
A. Matter cannot change form.
B. Matter is conserved during changes in form.
C. Matter changes weight when it changes form.
D. Matter does not change its physical properties.
Matter is conserved during changes in form
In a classroom experiment, 100 grams of water were placed in a beaker and left uncovered. Three days later, the teacher weighed the beaker again, and the class observed that there were only 96 grams of water.
What happened to the missing 4 grams of water?
They evaporated to a gas and floated away.
A student mixes a white powder with a blue liquid and observes what happens. Her observation makes her think that a new substance was formed.
Which of the following did she most likely observe?
The mixture of the white powder and blue liquid turned a new color - yellow
A student watches her uncle prepare to melt chocolate chips in the oven at home to make a hot fudge treat. The chocolate chips are placed into the oven. As the oven heats the chocolate chips, the student makes the following observations:
What happened to the chocolate chips?
The chocolate chips had a change of physical properties caused by the heat.
Liquid water typically boils to steam at 212°F (100°C).
A pot of water is heated to 212°F (100°C). The water is now boiling.
What happens to the temperature of the boiling water if we heat the pot to an even hotter temperature, such as 300°F (149°C)?
The water's temperature stays at 212°F (100°C). The water boils at the same rate as before.
The water's temperature stays at 212°F (100°C). The water boils at an increased rate due to the increased heat.
The water's temperature increases to 300°F (149°C) due to the increased heat. The water boils at the same rate as before.
The water's temperature stays at 212°F (100°C). The water boils at an increased rate due to the increased heat.
Water is placed inside a clear bottle. A balloon is placed over the top of the bottle. The bottle is placed in a heated pot. As the water in the bottle heats, the balloon expands.
What happens to the total weight of the bottle (with water inside) and balloon during this experiment?
Their weight stays the same throughout this experiment.
A student first observes the properties of baking soda and vinegar separately. Then, she adds 1 tablespoon of baking soda to 25 milliliters of vinegar in a beaker.
She records her observations in the table below.
Which observation is the best evidence that a new substance formed when the baking soda and vinegar were mixed together?
The bubbles show that a gas forms.