What are Solids, Liquids, and Gases?
How Does Matter Change?
What are Mixtures and Solutions?
What Affects the Speed of Dissolving?
100
Jacob put yeast into a bowl of water and added a little sugar. He put the bowl in a warm place. After a while, Jacob observed foam spilling out of the bowl. What kind of change is occurring? A. physical change B. chemical change C. scientific change D. geological change
What is chemical change?
100
Mai filled two balloons with the same amounts of water, sugar, and yeast. She put one on a table in the classroom. She put the other on a sunny windowsill. Why did Mai observe that the balloon in the window grew larger in size? A. The windowsill area is cooler. B. The windowsill area is warmer. C. The classroom table area is warmer. D. The classroom table area is the same temperature as the windowsill.
What is the windowsill area is warmer?
100
Which of these conditions has the greatest effect on how quickly a substance changes from one state to another? A. color B. light C. shape D. temperature
What is temperature?
100
Sergio tested a control solution at room temperature (25 °C), and measured how fast salt dissolved in it. Next, he cooled solution A to 10 °C and heated solution B to 40 °C. How quickly did the salt dissolve in solutions A and B compared to the control? A. faster for solutions A and B B. faster for solution A and slower for solution B C. slower for solution A and faster for solution B D. slower for solutions A and B
What is slower for solution A and faster for solution B?
200
Four students recorded how long it took for 1 tsp of sugar to dissolve in 1 cup of water. Their setups and results are shown below. Stirring Time (sec) zero stirs 28 two stirs 17 four stirs 11 six stirs 7 Which of the following happened as the number of stirs increased? A. The speed of dissolving increased. B. The speed of dissolving decreased. C. The amount of sugar dissolved increased. D. The amount of sugar dissolved decreased.
What is the speed of dissolving increased?
200
Four students dissolved 30 g of salt in 100 mL of water. Each student heated his or her water to a different temperature . Student Temperature (ºC) Time (sec) Marcus 10 65 Tyra 25 40 Luis 50 25 Andrew 75 15 For which student did the salt dissolve most quickly? Marcus Luis Tyra Andrew
Who is Andrew?
200
Felix is helping his father cook dinner. After Felix adds salt to the boiling water, what will he have in the pot? A. a mixture called a solution B. a solution called a mixture C. a mixture called a combination D. a solution called a combination
What is a mixture called a solution?
200
Tania’s mom boils water in a pot on the stove to make soup. Which of these ingredients will dissolve in the water? A. garlic B. pepper C. oil D. salt
What is salt?
300
Two substances make up a mixture. Substance X Substance Y Color black very dark gray Density (g/cm3) 1.85 0.66 Magnetism not magnetic not magnetic Particle shape pebble-shaped pebble-shaped Particle size very small very small What is the fastest way to separate substance X from substance Y? A. Use a magnet to attract one of the substances and leave the other. B. Put the particles in a container of water so that one will float and one will sink. C. Dissolve the substances in water and then evaporate the water to separate them. D. Sift the smaller particles through a screen to separate the bigger and smaller ones.
What is put the particles in a container of water so that one will float and one will sink?
300
Study the data table below. Melting Point and Boiling Point for Common Substances Substance Melting point (C) Boiling point (C) aluminum 660 2519 chlorine –101 –34 copper 1085 2927 gold 1065 2856 mercury –39 357 oxygen –218 –182 silver 961 2162 tungsten 3422 5555 The current temperature is 35 °C. Which substance would need the most energy to change from a solid to a liquid? A. copper B. oxygen C. gold D. tungsten
What is tungsten?
300
Study the data table below. Substance Density (g/cm3) aluminum 2.70 calcium 1.54 sodium 0.97 sulfur 1.96 tin 7.29 titanium 4.54 Nivia has samples of the substances in the table. Each sample has the same volume. Which sample has the greatest mass? A. aluminum B. tin C. sodium D. titanium
What is tin?
300
Lina needs to make a list of the physical properties of matter. Which of these should Lina include in her list? A. balance B. graduated cylinder C. temperature D. thermometer
What is temperature?
400
Each state of matter has certain physical properties. Which is a physical property of a gas? A. It has definite shape. B. It can be compressed. C. It has definite texture. D. Its particles vibrate in place.
What is it can be compressed?
400
Different elements have different kinds of atoms. How can you tell an atom of one element from an atom of another? A. the number of electrons B. the number of neutrons C. the number of nuclei D. the number of protons
What is the number of protons?
400
A scientist is examining two atoms. One has a nucleus with five protons and five neutrons surrounded by five electrons. The other has a nucleus with five protons and six neutrons surrounded by five electrons. What can the scientist conclude about these two atoms? A. They have different charges. B. They are the same element. C. They are not made of matter. D. They cannot form compounds.
What is they are the same element?
500
Wilson made a list of activities that involve a chemical change. Which of these changes should be included on his list? A. ringing a bell B. making ice cubes C. picking up rocks D. making pancakes
What is making pancakes?
500
Matter may be a gas, solid, or liquid. It can change from one state to another. Which change most often causes matter to change state? A. change in mass B. change in color C. change in volume D. change in temperature
What is change in temperature?
500
Every atom has a center called the nucleus. The nucleus has a positive charge. Which particles are found in the nucleus? A. neutrons only B. protons only C. electrons and protons D. neutrons and protons
What is neutrons and protons?
500
The rails on a railroad track have small gaps between sections of metal rails. Why are these gaps needed? A. They allow the metal to expand when it is heated without bending the rails. B. They allow the metal to expand when it is cooled without bending the rails. C. They keep the rails from touching and reacting with one another. D. They help chemical reactions between the rails and air happen faster.
What is they allow the metal to expand when it is heated without bending the rails?
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