Which of the following is a physical property of sodium?
Melting point
combustibility
molecular structure
reactivity
Which element does NOT have similar chemical properties to neon (Ne)?
He
Ar
Xe
F
Why does salt water appear to be a single substance even though it contains more than one substance?
Each component in salt water retains its original physical properties.
Salt water is a solution and a pure substance.
The components in salt water cannot be separated from each other.
The particles in salt water are spread throughout.
Reggie puts a beaker of ice and water on a hot plate, and the ice slowly begins to melt as shown in diagram below. After a few minutes, only liquid water is in the beaker. Eventually, the water becomes hot and boils. The liquid water changes to water vapor, which is a gas.
The ice particles have less energy.
The ice particles move faster.
The ice has a lower boiling point.
The ice has a higher temperature.
A stack of newspapers is burned completely to ash in a laboratory. How does the resulting mass relate to the initial mass of the stack of newspapers?
The mass of the gases and the ash should be double the mass of the initial stack of newspapers.
The mass of the gases and the ash should be one-fourth the mass of the initial stack of newspapers.
The mass of the gases and the ash should be one-half the mass of the initial stack of newspapers.
The mass of the gases and the ash should equal the mass of the initial stack of newspapers.
Why will a balloon filled with helium float in air?
Helium is less dense than air.
Helium is denser than air.
Helium is a diatomic molecule.
Helium is as dense as air.
Luke heats a liquid until it changes to a gas. What type of change occurs to the liquid?
physical
chemical
What should be corrected in the model of nitrogen (N) shown below?
Nitrogen should have eight electrons instead of seven.
Nitrogen should have seven protons instead of six.
Nitrogen should have eight protons instead of six.
Nitrogen should have six electrons instead of seven.
A raw egg will float in concentrated salt water but sink in tap water. What can a person conclude from this observation?
A raw egg is less dense than salt water but more dense than tap water.
A raw egg has the same density as salt water.
A raw egg, salt water, and tap water has the same density.
A raw egg is less dense that tap water but more dense than salt water.
A liquid has a mass of 25 grams (g) and a volume of 10 milliliters (mL). What is the density of the liquid?
250 g/ml
4.0 g/ml
2.5 g/ml
0.4 g/ml
Mariana conducted an experiment where she burned a 5 g strip of magnesium metal in an open flame. The result was a 3.5 g white ash collected in a crucible, a bright white flame, and smoke. Was the law of conservation of matter upheld in Mariana's experiment?
yes, because the missing mass was released as smoke
yes, because the missing mass was trapped by the closed system
no, because mass decreased after the magnesium was burned
no, because the magnesium was burned so mass was not lost
What chemical change occurs as a candle burns?
The heat melts the candle wax.
The candle wax turns liquid as it burns.
Heat and light are produced.
The candle wax changes shape.
What does an element of gold contain?
one mixed substance of two different metals
a single type of atom
a simple mixture of different atoms
one kind of compound
Which of the following is a chemical property?
boiling point
mass
ability to dissolve in water
reactivity with acid
Which of the following statements best describes the atoms and molecules that make up a glass filled with water?
The atoms and molecules of the liquid water are not moving, while the atoms and molecules of the glass are moving.
The atoms and molecules of both the liquid water and the glass are moving.
The atoms and molecules of neither the liquid water nor the glass are moving.
The atoms and molecules of the liquid water are moving, while the atoms and molecules of the glass are not moving.
How many atoms of chlorine (Cl) are in a molecule of phosphorus trichloride, PCl3?
0
1
2
3
Maribel and Isabela were conducting the following experiment:
Place and empty water bottle on the table and remove the lid. Carefully pour 10 ml of vinegar into the bottle.
Open up the mouth of the balloon and have your partner spoon 1 teaspoon of baking soda into the balloon.
Without spilling any of the baking soda, stretch the mouth of the balloon over the mouth of the bottle.
Turn the balloon completely upright so that the baking soda inside the balloon pours into the bottle with the vinegar.
The baking soda looked like it dissolved in the vinegar. Maribel and Isabela watched as the balloon expanded and filled with a gas. Was this a physical or chemical change and why?
It was a chemical change because a gas was produced.
It was a physical change because the water bottle got hot.
It was a chemical change because the baking soda dissolved.
It was a physical change because the baking soda dissolved.
An apple reacts with the oxygen in the air after being cut, which is a physical change.
True
False
Which of the following will NOT occur when water undergoes a physical change?
The motion of the molecules increases.
The molecules become less closely packed.
The molecules form new chemical bonds.
The kinetic energy of the molecules increases.
The energy transferred between particles of two objects that have a difference in temperature is:
work
mechanical energy
potential energy
heat
Which of the following describes the difference between the motion of liquid water and water vapor?
The particles in a gas can slide past each other, while the particles in a liquid are locked in place.
The particles in a liquid can slide past each other, while the particles in a gas are free to move in all directions.
The particles in the liquid do not move, but the particles in a gas can move back and forth.
The motion of the particles is the same in both states, but they move slower in the gas state.
Does the equation below follow the Law of Conservation of Matter?
2As + 6NaOH --> 2Na3AsO3 + NH2
No, because the reactants contain more oxygen (O) atoms than the products.
No, because the reactants contain more hydrogen (H) atoms than the products.
Yes, because the mass of the reactants is equal to the mass of the products.
Yes, because the reactants contain the same number of arsenic (As) atoms as the products.
How do particles of a gas differ from particles of a liquid when in the same container?
Gas particles are more spread out
Gas particles are smaller
Gas particles are closer together
Gas particles are larger
Please I need help ASAP on my test! There were a few questions with pictures and I couldn't paste it onto here so I really hope someone has the same test! I need answers soon!
Thank you!
No, because the reactants contain more hydrogen (H) atoms than the products. (6 to 2!)
Where are your attempts to answer ?? !
Sorry, I didn't know that you were suppose to show your "Answers"
melting point
F
The particles in salt water are spread throughout.
The ice particles move faster.
The mass of the gases and the ash should be double the mass of the initial stack of newspapers.
Helium is less dense than air.
chemical
Nitrogen should have seven protons instead of six.
A raw egg has the same density as salt water.
2.5 g/ml
2
no, because mass decreased after the magnesium was burned
Heat and light are produced.
one mixed substance of two different metals
reactivity with acid
The atoms and molecules of both the liquid water and the glass are moving.
3
It was a chemical change because a gas was produced.
True
The molecules form new chemical bonds.
potential energy.
The particles in a liquid can slide past each other, while the particles in a gas are free to move in all directions.
Yes, because the mass of the reactants is equal to the mass of the products.
Gas particles are more spread out.
Please guys! I need to know if my answers are right or wrong! I am in a major rush
Which of the following is a physical property of sodium?
Melting point
Which element does NOT have similar chemical properties to neon (Ne)?
F
Why does salt water appear to be a single substance even though it contains more than one substance?
Salt water is a solution and a pure substance.
Reggie puts a beaker of ice and water on a hot plate, and the ice slowly begins to melt as shown in diagram below. After a few minutes, only liquid water is in the beaker. Eventually, the water becomes hot and boils. The liquid water changes to water vapor, which is a gas.
A stack of newspapers is burned completely to ash in a laboratory. How does the resulting mass relate to the initial mass of the stack of newspapers?
The mass of the gases and the ash should be double the mass of the initial stack of newspapers.
(You added O2 from the air)
Why will a balloon filled with helium float in air?
Helium is less dense than air.
Luke heats a liquid until it changes to a gas. What type of change occurs to the liquid?
physical
What should be corrected in the model of nitrogen (N) shown below?
Nitrogen should have seven protons instead of six.
A raw egg will float in concentrated salt water but sink in tap water. What can a person conclude from this observation?
A raw egg is less dense than salt water but more dense than tap water.
A liquid has a mass of 25 grams (g) and a volume of 10 milliliters (mL). What is the density of the liquid?
2.5 g/ml
Mariana conducted an experiment where she burned a 5 g strip of magnesium metal in an open flame. The result was a 3.5 g white ash collected in a crucible, a bright white flame, and smoke. Was the law of conservation of matter upheld in Mariana's experiment?
yes, because the missing mass was released as smoke
What chemical change occurs as a candle burns?
The candle wax turns liquid as it burns.
What does an element of gold contain?
a single type of atom
Which of the following is a chemical property?
reactivity with acid
Which of the following statements best describes the atoms and molecules that make up a glass filled with water?
The atoms and molecules of the liquid water are moving, while the atoms and molecules of the glass are not moving.
How many atoms of chlorine (Cl) are in a molecule of phosphorus trichloride, PCl3?
3
Maribel and Isabela were conducting the following experiment:
Place and empty water bottle on the table and remove the lid. Carefully pour 10 ml of vinegar into the bottle.
Open up the mouth of the balloon and have your partner spoon 1 teaspoon of baking soda into the balloon.
Without spilling any of the baking soda, stretch the mouth of the balloon over the mouth of the bottle.
Turn the balloon completely upright so that the baking soda inside the balloon pours into the bottle with the vinegar.
The baking soda looked like it dissolved in the vinegar. Maribel and Isabela watched as the balloon expanded and filled with a gas. Was this a physical or chemical change and why?
It was a chemical change because a gas was produced.
An apple reacts with the oxygen in the air after being cut, which is a physical change.
True
Which of the following will NOT occur when water undergoes a physical change?
The molecules form new chemical bonds.
The energy transferred between particles of two objects that have a difference in temperature is:
heat
Which of the following describes the difference between the motion of liquid water and water vapor?
The particles in a liquid can slide past each other, while the particles in a gas are free to move in all directions.
Does the equation below follow the Law of Conservation of Matter?
2As + 6NaOH --> 2Na3AsO3 + NH2
No, because the reactants contain more hydrogen (H) atoms than the products.
How do particles of a gas differ from particles of a liquid when in the same container?
Gas particles are more spread out