Answers IC_IPC_A_3141_SAISD 25-26Cumulative Exam

Cumulative Exam Answers

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The equation for water is H2 +O2 → H2O. To balance the equation, which coefficient should be placed in front of H2 and H2O?

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What kind of acceleration occurs when an object speeds up?

positive

negative

neutral

zero

Which element is least likely to form chemical bonds?

phosphorus (P)

helium (He)

sodium (Na)

carbon (C)

Marco wants to investigate the chemical properties of sodium bicarbonate, or baking soda. He plans to carry out the tests below.Test 1: Mix a teaspoon of sodium bicarbonate into a cup of warm water to see if it dissolves.Test 2: Mix a teaspoon of sodium bicarbonate into a cup of vinegar to see if it fizzes.Test 3: Heat a teaspoon of sodium bicarbonate in the oven to see if its melting point is less than 400 degrees Fahrenheit.

Only Test 3 will indicate a chemical property of sodium bicarbonate. Tests 1 and 2 will show a physical property of the substance.

Only tests 1 and 2 will indicate chemical properties of sodium bicarbonate. Test 3 will show a physical property of the substance.

Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.

Only tests 1 and 3 will indicate chemical properties of sodium bicarbonate. Test 2 will show a physical property of the substance.

A company that manufactures cookware has conducted numerous trials to see which metal needs the least amount of energy (measured in Joules, J) to be raised to high temperatures, and records the averages in a table. Which claim will this company most likely make?

Aluminum pans are the most energy-efficient cookware.

Copper pans are the most energy-efficient cookware, but they cost the most.

Iron pans require less energy to heat up than copper frying pans, but they cost less.

Copper pans require the most energy to heat up.

Wanda and Marita are drinking bottles of water. Each girl sounds a different musical note by blowing across the top of her bottle.What is a good hypothesis that could lead to new experimentation?

It is more fun to play musical notes with carbonated water than with normal spring water.

If the lid on a bottle is tightly closed, then blowing across the top of the bottle will not make a musical note.

Blowing across the top of a bottle can make a musical note.

If there is less water in the bottle, then the note played is lower because there is more air to move around.

Which describes the correct procedure when converting a number from scientific notation to standard notation?

If the power of 10 is positive, move the decimal point to the left.

If the power of 10 is positive, move the decimal point to the right.

If the number being converted is greater than 10, move the decimal point to the left.

If the number being converted is greater than 10, move the decimal point to the right.

Which statement describes an extensive property of matter?

It changes with the color of a substance.

It changes when a new substance is formed.

It changes with the amount of sample that is present.

It changes with the composition of a substance.

Xander reached a final velocity of 4.5 m/s in 3.5 seconds. Finley reached a final velocity of 3.6 m/s in 4.2 seconds. Max reached a final velocity of 7.3 m/s in 1.2 seconds. They all started at the same location from rest.

Max Finley Xander

Max Xander Finley

Xander Finley Max

Finley Xander Max

Which instrument is best suited for measuring the dimensions of a shoebox?

a triple-beam balance

a volumetric flask

a ruler

a caliper

Read the passage about the fluoridation of drinking water.Since the early 1960s, fluoride has been added to many sources of drinking water to prevent cavities in teeth. This is called fluoridation. There are some who say that this is unnecessary and increases the risk of cancer.In 1993, the Subcommittee on Health Effects of Ingested Fluoride of the National Research Council, part of the National Academy of Sciences, conducted an extensive study about the link between fluoridated drinking water and increased cancer risk. The study included data from more than 50 human disease studies and six animal studies. The Subcommittee concluded that none of the data showed a link between fluoridated drinking water and cancer. A 1999 report by the CDC supported these findings. The CDC report concluded that studies so far have produced "no credible evidence” of a link between fluoridated drinking water and an increased risk for cancer.

There is no link between fluoride exposure and increased cancer risk in humans.

There is a possible link between fluoride exposure and increased cancer risk in humans.

There is a definite link between fluoride exposure and increased cancer risk in humans and animals.

There is a possible link between fluoride exposure and increased cancer risk in animals.

Which property of physical changes explains why matter is conserved in a physical change?

The arrangements of particles do not change, and the bonds between atoms do not break.

Mass, not energy, changes in a physical change.

Energy and mass change in a physical change.

The bonds between atoms do not break; it is only the arrangement that changes.

Scientists often work on projects for a long time and fail to see sources of error in their research. Which process allows an outside expert to look at the scientist’s project and point to sources of error?

direct funding

peer review

conclusive research

data collection

Which statement describes the location of most metalloids on the periodic table?

The metalloids are located below metals and above nonmetals within a group.

The metalloids are located below nonmetals and above metals within a group.

The metalloids are located to the right of nonmetals and to the right of metals within a period.

The metalloids are located to the left of nonmetals and to the left of metals within a period.

Atoms of arsenic (As) are often added to silicon (Si) in a process called doping to change the conductivity of the silicon. How does the addition of arsenic change the conductivity of silicon?

An atom of arsenic has one fewer valence electron and more electron shells than an atom of silicon, so the conductivity decreases because the arsenic atom gains an electron.

An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity decreases because the arsenic atom loses the electron.

An atom of arsenic has one fewer valence electron and fewer electron shells than an atom of silicon, so the conductivity increases because the arsenic atom gains an electron.

An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity increases because the arsenic atom loses the electron.

When hydrogen peroxide bubbles, it is undergoing a chemical change. Which statement best describes what is happening?

The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.

The atoms in hydrogen peroxide are breaking apart and recombining into the original molecules.

The molecules of hydrogen peroxide remain intact as new types of molecules form and move out of the liquid.

The molecules of hydrogen peroxide remain intact but move more quickly to allow evaporation.

What does a triple-beam balance require the user to do?

add the numbers from the three sliders to determine the mass of an object

multiply the numbers from the three sliders to determine the mass of an object

add the numbers from the three sliders to determine the volume of an object

multiply the numbers from the three sliders to determine the volume of an object

synthesispolymerizationdecompositionoxidationreplacement

synthesis

polymerization

decomposition

oxidation

replacement

The statements in the table summarize what Johannes Kepler stated in the early 1600s about the motion of planets.Kepler’s StatementsThe orbit of a planet around the sun is an ellipse.As a planet orbits the sun, a line between the planet and the sun sweeps out equal areas during equal periods of time.There is a mathematical relationship between the time it takes a planet to orbit the sun and the average distance the planet is from the sun.Over the last four hundred years, predictions based on his statements have proven true. Which best describes Kepler’s statements?

hypothesis

theory

law

explanation

Ciara’s bike has rusted, which means that the iron in the metal changed to rust.

an energy formation

an exothermic reaction

a chemical reaction

a precipitate formation

The graph represents velocity vs. time for Carla.

Carla sped up in the beginning of her trip, stopped, and then slowed down.

Carla had a greater acceleration in the beginning than in the end.

Carla slowed down in the beginning of her trip, stopped, and then sped up.

Carla had a continuous acceleration throughout the entire trip.

Which example illustrates a chemical change?

shredding paper

smashing a soda can

burning wood

chopping wood

Which represents an endothermic reaction?

wood burning in a fire

splitting a gas molecule

using a heat pack on an injury

TNT exploding

Which data can be measured quantitatively?

speed of light

odor of gas

texture of a solid

color of a flame

Which ranks these materials by the attraction between their atoms from the weakest to the strongest?

oxygen gas, liquid water, liquid honey, solid iron ore

liquid water, liquid honey, oxygen gas, solid iron ore

solid iron ore, liquid honey, liquid water, oxygen gas

oxygen gas, liquid honey, liquid water, solid iron ore

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