Science Periodic Week 10
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Questions and Answers
- 1.
The amount of space an object takes up is [_______]
Explanation
The term "volume" refers to the amount of space that an object occupies. It is a measure of three-dimensional space and is typically expressed in cubic units. In other words, volume quantifies the capacity or size of an object, taking into account its length, width, and height.Rate this question:
- 2.
Volume of [_______] is usually measured in cubic meters (m3 ) and cubic centimeters (cm3 )
Explanation
Solids are three-dimensional objects with a definite shape and volume. The volume of a solid refers to the amount of space it occupies. It is commonly measured in cubic meters (m3) and cubic centimeters (cm3) because these units provide a convenient way to quantify the three-dimensional space occupied by a solid.Rate this question:
- 3.
Multiplying the [________] by the [__________] and the [_________] gives the volume of a box. e.g. the volume of the box shown below is 1000 cm3
Explanation
To find the volume of a box, you need to multiply the length, width, and height together. In the given example, the volume of the box is 1000 cm3. This means that if you multiply the length, width, and height of the box shown below, the result will be 1000 cm3.Rate this question:
- 4.
A tool we most likely use to measure the length, width, and height of regularly shaped object like the box is a [________]
Explanation
A ruler is a tool commonly used to measure the length, width, and height of regularly shaped objects like a box. It provides a straight and accurate measurement, making it suitable for this purpose.Rate this question:
- 5.
Volume of [__________] is usually measured in liters (L) or milliters (mL)
Explanation
The volume of liquids is usually measured in liters (L) or milliliters (mL) because these units are appropriate for measuring the amount of liquid in a container. Liters and milliliters are commonly used in everyday life and are easily convertible between each other, making them convenient units for measuring liquid volumes.Rate this question:
- 6.
One cubic centimeter is equal to [_________] milliliter
Explanation
One cubic centimeter is equal to one milliliter. This is because both measurements are used to represent volume and they have a one-to-one conversion ratio. Therefore, if you have one cubic centimeter of liquid, it can also be expressed as one milliliter of liquid.Rate this question:
- 7.
The volume of a liquid can be found by placing it in a [___________] (which shows volume in milliliters).
Explanation
A graduated cylinder is a tool used to measure the volume of a liquid. It has markings on the side that indicate the volume in milliliters. By placing the liquid in the graduated cylinder and reading the measurement at the meniscus, one can determine the volume of the liquid accurately.Rate this question:
- 8.
To find the volume of an irregularly shaped solid such as a pebble, measure the [_________] in the water level in a graduated cylinder. e.g. The volume of the irregularly shaped solid is 15-10 = [____] mL
Explanation
The correct answer is "change, 5". To find the volume of an irregularly shaped solid like a pebble, you can use the displacement method. Place the pebble in a graduated cylinder partially filled with water and measure the change in water level. The difference in water level corresponds to the volume of the pebble. In this case, the change in water level is 5 mL, indicating that the volume of the pebble is 5 mL.Rate this question:
- 9.
[_________] is mass per unit volume (density is the mass of an object divided by its volume). A unit of density is grams per cubic centimeter (g/cm3 )
Explanation
Density is a measure of how much mass is contained in a given volume. It is calculated by dividing the mass of an object by its volume. The unit commonly used for density is grams per cubic centimeter (g/cm3), which represents the mass of a substance in grams divided by the volume it occupies in cubic centimeters.Rate this question:
- 10.
Objects made of the same material have the same density. e.g.The water density in both the cup and the bottle is the [_______]
Explanation
Objects made of the same material have the same density because density is a property of the material itself, not the shape or size of the object. In this case, both the cup and the bottle are made of the same material, which is not specified in the question, and therefore they have the same density.Rate this question:
- 11.
Two iron nails of different sizes have [______] density because they are made up of the [_____] material.
Explanation
Two iron nails of different sizes have the same density because density is a property of a material that remains constant regardless of the size or shape of the object. Iron nails are made up of the same material, which is iron, hence they have the same density.Rate this question:
- 12.
Objects that are made of different material have [_______] densities
Explanation
Different materials have different densities because density is a measure of how much mass is contained within a given volume. Each material has its own unique arrangement of atoms or molecules, which affects how closely packed they are and how much mass is contained within a specific volume. Therefore, materials with different compositions and structures will have different densities.Rate this question:
- 13.
If the density of an object such as a cork is less than the density of water, the object [_______], and if the density of an object such as iron nail is greater than the density of water, the object [_______]
Explanation
When the density of an object is less than the density of water, such as in the case of a cork, the object will float. This is because the buoyant force exerted by the water is greater than the weight of the object, causing it to rise to the surface. On the other hand, when the density of an object is greater than the density of water, like in the case of an iron nail, the object will sink. The buoyant force is not strong enough to counteract the weight of the object, causing it to descend to the bottom.Rate this question:
- 14.
Oil [floats] on water because the density of oil is [_______] than that of water.
Explanation
Oil floats on water because the density of oil is less than that of water. This means that oil is less dense than water, causing it to float on top of it. Density is a measure of how much mass is packed into a given volume, so when comparing the density of oil and water, oil has a lower mass per unit volume than water. As a result, the oil is buoyant and rises to the surface of the water, creating a layer on top.Rate this question:
- 15.
A large log of wood would float on the surface of water since the density of wood is [______] than that of water.
Explanation
A large log of wood would float on the surface of water since the density of wood is less than that of water. This means that the mass of wood per unit volume is lower than that of water, allowing the wood to displace a greater volume of water and remain buoyant.Rate this question:
- 16.
A change in which one or more new substances are made is called a [________] change e.g. burning a matchstick, rusting of an iron nail, cooking a fish and decaying of a leaf
Explanation
A change in which one or more new substances are made is called a chemical change. This type of change involves a chemical reaction where the original substances are transformed into different substances with new properties. Examples of chemical changes include burning a matchstick, rusting of an iron nail, cooking a fish, and decaying of a leaf. In each of these examples, the original substances undergo a chemical reaction, resulting in the formation of new substances.Rate this question:
- 17.
The chemical change that causes the change of the substances that make up food is called [__________]
Explanation
The term "cooking" refers to the chemical change that occurs when food is heated or prepared using various methods such as boiling, frying, baking, etc. During cooking, the substances in food undergo chemical reactions that result in changes in taste, texture, and appearance. These reactions involve processes such as denaturation of proteins, caramelization of sugars, and Maillard browning reactions. Therefore, cooking is the correct term to describe the chemical change that causes the transformation of food substances.Rate this question:
- 18.
When a shiny silver iron nail changes into a red crumbly substance, it is said to be [_______].
Explanation
When a shiny silver iron nail changes into a red crumbly substance, it is said to be rusting. Rusting is a chemical reaction that occurs when iron reacts with oxygen in the presence of moisture. The iron oxidizes and forms iron oxide, which gives the nail a red color and causes it to become crumbly. This process is commonly seen in objects made of iron or steel that are exposed to air and moisture over time.Rate this question:
- 19.
When wood changes into ash and hot gases, it is said to be [_________].
Explanation
When wood undergoes the process of combustion, it changes into ash and hot gases. This process is commonly referred to as "burning". Burning is a chemical reaction that occurs when a fuel, such as wood, combines with oxygen in the presence of heat, resulting in the release of energy in the form of heat and light. In this case, the wood is being transformed into ash, which is the solid residue left behind after the combustion process, and hot gases, which are the byproducts of the reaction.Rate this question:
- 20.
When plant leaves fall off to the ground and form new substances, they are said to be [___________].
Explanation
When plant leaves fall off and decompose on the ground, they undergo a process called "decaying." During this process, the leaves break down and form new substances such as organic matter and nutrients that enrich the soil. Decaying is a natural and essential part of the ecosystem, as it helps to recycle nutrients and support the growth of other plants.Rate this question:
- 21.
Evidence of a (________) change: change of color, odor, taste, temperature and formation of bubbles. e.g. signs that indicate that a chemical change occurs when the cake is baked: change in taste, odor, color, (________) formation.
Explanation
The given answer is correct because it accurately identifies the missing words in the sentence. The evidence of a chemical change includes changes in color, odor, taste, temperature, and the formation of bubbles. In the example of baking a cake, the taste, odor, and color of the cake change, indicating a chemical change. The formation of bubbles is also mentioned as evidence of a chemical change.Rate this question:
- 22.
The change in [_____] of milk is evidence that it is spoiled (chemical change).
Explanation
The presence of a strong odor in milk indicates that it has undergone a chemical change and is spoiled. When milk spoils, bacteria break down the proteins and sugars present in it, producing compounds that give off a distinct smell. This change in the odor of milk is a clear sign of spoilage and indicates that chemical reactions have occurred, leading to the decomposition of the milk's components.Rate this question:
- 23.
In a glow stick, the chemical change is indicated by the production of [_______].
Explanation
In a glow stick, the chemical change is indicated by the production of light. This is because glow sticks contain a mixture of chemicals, including a fluorescent dye and a hydrogen peroxide solution. When the glow stick is activated by bending it, the chemicals react and the hydrogen peroxide oxidizes the dye. This reaction produces energy in the form of light, causing the glow stick to emit a bright glow.Rate this question:
- 24.
When an iron nail rusts, the chemical change is indicated by the change in [_______].
Explanation
When an iron nail rusts, the chemical change is indicated by a change in color. Rusting occurs when iron reacts with oxygen in the presence of moisture, forming iron oxide. The initial color of the iron nail is usually silver or gray, but as it rusts, it gradually changes to a reddish-brown color. This change in color is a visual indication of the chemical reaction taking place between the iron and oxygen.Rate this question:
- 25.
When vinegar is added to baking soda, the chemical change is indicated by the formation of [_______]
Explanation
When vinegar is added to baking soda, a chemical reaction occurs. This reaction produces carbon dioxide gas, which is indicated by the formation of bubbles. The carbon dioxide gas is released as a result of the reaction between the acetic acid in vinegar and the sodium bicarbonate in baking soda. This reaction is commonly used in baking and cooking to create a lighter texture in baked goods.Rate this question:
- 26.
When iodine is added to flour, the evidence of chemical change is the change in [______].
Explanation
When iodine is added to flour, the evidence of chemical change is the change in color. This is because iodine reacts with starch, which is present in flour, to form a dark blue or black color. This color change indicates that a chemical reaction has occurred between the iodine and the starch molecules in the flour.Rate this question:
- 27.
The process of burning something is called [______________].
Explanation
Combustion refers to the process of burning something. It involves the rapid chemical reaction between a fuel and an oxidizing agent, typically oxygen, resulting in the release of heat and light. During combustion, the fuel undergoes oxidation, breaking down into simpler molecules and releasing energy in the form of heat and light. This process is commonly used for various purposes, such as heating, cooking, and powering engines.Rate this question:
- 28.
During combustion, (when wood or paper is burned) the chemical change is indicated by the production of [______] and change in [________]
Explanation
During combustion, the chemical change is indicated by the production of light and a change in temperature. When wood or paper is burned, the energy released causes the molecules in the material to break apart and recombine with oxygen from the air, resulting in the release of light energy in the form of flames. This chemical reaction also generates heat, which leads to a noticeable increase in temperature in the surroundings.Rate this question:
- 29.
The ability of a substance to undergo a chemical change is a [_________] property
Explanation
The ability of a substance to undergo a chemical change is a chemical property. This is because a chemical property refers to the characteristics of a substance that can only be observed when it undergoes a chemical reaction or interaction with another substance. In this case, the substance's ability to undergo a chemical change indicates that it has a chemical property.Rate this question:
- 30.
A substance that can burn is said to be [________] such as gasoline, wood, paper and naural gas.
Explanation
A substance that can burn is referred to as combustible. This includes materials such as gasoline, wood, paper, and natural gas. Combustible substances have the potential to catch fire and undergo combustion when exposed to a source of ignition, such as heat or an open flame. They contain the necessary components, such as fuel, oxygen, and heat, to sustain a combustion reaction. Combustible materials are commonly used as energy sources but require caution and proper handling to prevent accidents or uncontrolled fires.Rate this question:
- 31.
(______), such as steel, are not combustible (cooking pots are usually made of metals and not plastic since plastic is combustible and burns easily when exposed to fire).
Explanation
Metals, such as steel, are not combustible because they have high melting points and do not easily catch fire when exposed to heat or flames. This is why cooking pots are usually made of metals like stainless steel or cast iron, as they can withstand high temperatures without burning or melting. In contrast, materials like plastic are combustible and can easily ignite and burn when exposed to fire.Rate this question:
- 32.
The law of conservation of mass states that matter can neither be created nor [_______] (total mass is conserved during a chemical change).
Explanation
The law of conservation of mass states that matter can neither be created nor destroyed. This means that the total mass of a system remains constant during a chemical change.Rate this question:
- 33.
When wood or paper is burned with oxygen, it produces [_____], water vapor, and carbon dioxide. The wood has different physical and chemical properties than the substances produced.
Explanation
When wood or paper is burned with oxygen, it produces ash, water vapor, and carbon dioxide. Ash is the residue left behind after the combustion process. It is a powdery substance consisting of the inorganic minerals present in the wood or paper. Ash has different physical and chemical properties compared to the original wood or paper, as it is mainly composed of minerals rather than organic compounds.Rate this question:
- 34.
The mass of the ashes is less than the mass of the wood burned. But the total mass of the paper and oxygen consumed is the [_______] as the mass of the ash, carbon dioxide and water vapour produced
Explanation
When wood is burned, it undergoes a chemical reaction with oxygen to produce ash, carbon dioxide, and water vapor. The mass of the ashes is less than the mass of the wood burned because some of the wood is converted into gases (carbon dioxide and water vapor) which escape into the atmosphere. However, the total mass of the paper and oxygen consumed in the combustion process is the same as the mass of the ash, carbon dioxide, and water vapor produced because mass is conserved in a chemical reaction.Rate this question:
- 35.
Chemical changes, such as food spoiling, happen [______] at higher temperature
Explanation
Chemical changes, such as food spoiling, happen faster at higher temperatures. This is because increasing the temperature of a substance increases the kinetic energy of its molecules. As a result, the molecules move more rapidly and collide with each other more frequently. This increased collision frequency leads to a higher likelihood of successful chemical reactions occurring, causing the chemical change to happen more quickly.Rate this question:
- 36.
To preserve milk or raw meat longer we should store them in the fridge because the [_____] temperature in the fridge slows down chemical changes
Explanation
Storing milk or raw meat in the fridge helps to preserve them longer because the low temperature in the fridge slows down chemical changes. The cold temperature inhibits the growth of bacteria and other microorganisms, reducing the spoilage process. Additionally, the low temperature slows down enzymatic reactions that can cause the breakdown of proteins and fats, extending the shelf life of these perishable items.Rate this question:
- 37.
A system of measurement based on tens is called the [________] system
Explanation
A system of measurement based on tens is called the metric system. This system is widely used around the world and is based on decimal units. It provides a consistent and standardized way of measuring length, weight, volume, and other quantities. The metric system is known for its simplicity and ease of conversion between units, making it a preferred choice in many scientific and everyday applications.Rate this question:
- 38.
In the metric system, the base unit of: a) mass is [_______](g). b) length is [___________] (m) c) liquid volume is [__________] (L) d) solid volume is [___________] (m3 )
Explanation
The metric system is a decimal-based system of measurement used worldwide. In this system, the base unit of mass is the gram (g), which is used to measure the amount of matter in an object. The base unit of length is the meter (m), which is used to measure distance or size. The base unit of liquid volume is the liter (L), which is used to measure the amount of space occupied by a liquid. Finally, the base unit of solid volume is the cubic meter (m3), which is used to measure the amount of space occupied by a solid object.Rate this question:
- 39.
One thousand grams is equal to [____________] (1 kg represents 1,000 g).
Explanation
One thousand grams is equal to one kilogram. This is because the metric system uses a base unit of 1,000 grams to represent 1 kilogram. Therefore, when converting between grams and kilograms, you can simply divide or multiply by 1,000 to obtain the equivalent measurement. In this case, since the question states that 1 kg represents 1,000 g, it confirms that one kilogram is the correct answer.Rate this question:
- 40.
One meter is equal to [___________] centimeters
Explanation
One meter is equal to one hundred centimeters.Rate this question:
- 41.
A measure of the amount of matter in an object is [________].
Explanation
Mass is a measure of the amount of matter in an object. It represents the quantity of particles, such as atoms and molecules, that make up the object. Mass is a fundamental property of matter and is independent of the object's location or the force acting on it. It is commonly measured in units such as kilograms or grams.Rate this question:
- 42.
A tool used to measure the mass of an object is a [________] .
Explanation
A balance is a tool used to measure the mass of an object. It typically consists of a beam that is balanced on a central pivot point, with two pans hanging from either end. The object whose mass is being measured is placed on one pan, and standard weights are added to the other pan until the beam is level and balanced. The sum of the added weights is then equal to the mass of the object. Balances are commonly used in scientific experiments, laboratories, and industries where precise measurements of mass are required.Rate this question:
- 43.
A measure of the pull of gravity on an object is [________].
Explanation
Weight is a measure of the pull of gravity on an object. It is the force exerted by gravity on an object with mass. The weight of an object can vary depending on the strength of the gravitational field it is in. Weight is commonly measured in units such as pounds or kilograms.Rate this question:
- 44.
The weight of an object is expressed in [_________].
Explanation
The weight of an object is expressed in newton. Newton is the unit of measurement for weight in the International System of Units (SI). It is named after Sir Isaac Newton, the physicist who formulated the laws of motion. The newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared. Therefore, when we talk about the weight of an object, we use newton as the unit to quantify it.Rate this question:
- 45.
Type question here. Example: Practice makes you ________
- 46.
A tool used to measure the weight of an object is a [_______________].
Explanation
A spring scale is a tool used to measure the weight of an object. It consists of a coiled spring that stretches when a force is applied to it. The amount of stretch in the spring is directly proportional to the force applied, which allows the scale to determine the weight of the object. By calibrating the scale with known weights, it can provide accurate measurements of the weight of various objects.Rate this question:
- 47.
The weight of an object is greater where gravity is stronger. e.g. The weight of an astronaut on the moon is [_________] than its weight on Earth since the moon has less gravity.
Explanation
The weight of an object is determined by the force of gravity acting on it. Gravity is weaker on the moon compared to Earth, so the force of gravity pulling on the astronaut is less on the moon. As a result, the weight of the astronaut on the moon is less than their weight on Earth.Rate this question:
- 48.
The weight of an object also depends on its mass. e.g.When the weights of two objects are measured in the same place, the one that has more [_________] has more weight.
Explanation
The weight of an object depends on its mass because weight is the force exerted on an object due to gravity, and mass is a measure of the amount of matter in an object. When two objects are measured in the same place, the one with more mass will have more weight because it has more matter and therefore experiences a greater gravitational force.Rate this question:
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