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29. The principle of flotation states that a floating body A. displaces its own weight of fluid in which it floats.
12 It is more advantageous to use solar energy than fossil fuel energy because solar energy is renewable and B. fossil fuels produce carbon dioxide.
5b(ii) In semiconductors, the charge carriers can be both electrons and electron "holes."
5.b(i) In electronics, doping refers to the process of intentionally adding impurities to a semiconductor material.
5a. (ii) To prepare the solution, two apparatus that will be needed are a measuring cylinder and a stirring rod.
Question 5. a(i) To calculate the mass of ammonium chloride crystals needed, we can use the formula:
mass = concentration x volume x molar mass
Given that the concentration is 0.5 mol/dm³ and the volume is 200 cm³, we need to convert the volume to dm³:
200 cm³ = 200/1000 dm³ = 0.2 dm³
The molar mass of ammonium chloride (NH₄Cl) is:
(N: 14.0) + (H: 1.0 x 4) + (Cl: 35.5) = 14.0 + 4.0 + 35.5 = 53.5 g/mol
Now we can calculate the mass:
mass = 0.5 mol/dm³ x 0.2 dm³ x 53.5 g/mol = 5.35 g
Therefore, approximately 5.35 grams of ammonium chloride crystals will be needed for the preparation.
(e)
(i) Movable joints in the human body can be found in locations such as the shoulders, hips, and knees.
(ii) Immovable joints, also known as fixed or fibrous joints, are present in the human skull, where the cranial bones are tightly fused together.
(2)
(a) Diaphragm: The diaphragm is a respiratory muscle that contracts and flattens during inhalation, increasing the volume of the chest cavity and allowing air to be drawn into the lungs.
(b) Intercostal muscle: The intercostal muscles are found between the ribs and aid in the expansion and contraction of the chest cavity during breathing.
(c) Ribs: Ribs protect vital organs like the heart and lungs.
(3) Three problems contributing to poor pig production in Ghana are disease outbreaks, inadequate nutrition, and poor management practices. Two management practices performed on piglets are castration and tail docking.
(d)
(i) One location of a movable joint in the human body is the shoulder joint.
(ii) One location of an immovable joint in the human body is the sutures of the skull.
6.
(a)
(i) Biotic factors are living organisms and their interactions within an ecosystem.
(ii) Two examples of abiotic factors in an ecosystem are sunlight and temperature.
(b)
(1) Structural formulas of organic compounds:
(a) CH4
(b) CH3OH (methanol)
(c) CH3COOH (acetic acid)
(2) Names of organic compounds:
(a) Methane
(b) Methanol
(c) Acetic acid
(4)
(ii) Two housing systems for keeping livestock in Ghana are free-range systems and confinement systems. Three factors to consider when selecting a suitable housing system for livestock are climate conditions, the type of livestock being raised, and available resources and space.
(d)
(i) Instruments used to measure quantities:
(a) Potential difference is measured using a voltmeter.
(b) Electric current is measured using an ammeter.
To determine the resistance of the resistor in the electric circuit, you can use Ohm's law: R = V/I, where R is resistance, V is potential difference (240 V), and I is current (24 A). Therefore, the resistance is R = 240 V / 24 A = 10 ohms.
2. d(i) Biodiversity refers to the variety of living organisms in a particular area or on Earth. It includes the diversity of species, their genetic variations, and the different ecosystems they inhabit. Biodiversity is important because it contributes to the stability and resilience of ecosystems, supports essential ecological processes, and provides us with valuable resources. It's like having a wide range of different plants, animals, and ecosystems all living together in harmony. 🌿🦁🌍. 2. d(ii)
1. Ecological Services
2. Medicinal Resources
3. Economic Benefits
Question 2
a(i) 1. Mulching prevents soil erosion
2. Mulching reduces weed growth
3. Mulching increases soil fertility
2. a(ii)
(a) Hoeing: Hoeing helps to break up the soil, remove weeds, and improve soil aeration.
(b) Stumping: Stumping involves removing tree stumps from the land, which helps to clear the area and create a smooth surface for farming or construction.
2.b(i)Sea breeze occurs when cooler air from the sea moves towards the land, replacing the warmer air over the land. This happens because during the day, the land heats up faster than the sea. The warm air over the land rises, creating a low-pressure area. The cooler air from the sea then moves in to fill this void, creating a refreshing breeze. It's a natural way for the land and sea to balance out temperature differences. 🌊🌬️
2b (ii) Sea breeze occurs due to two main reasons:
1. Temperature Difference: The land heats up faster than the sea during the day, creating a temperature gradient that drives the movement of air from the cooler sea towards the warmer land.
2. Pressure Difference: As the land heats up, the warm air rises, creating a low-pressure area. The cooler air from the sea then moves towards the land to fill this void, resulting in a sea breeze. 🌊🌬️
Question 3
3ai. Greenhouse gases are gases that trap heat in the Earth's atmosphere, like carbon dioxide and methane.
ii.carbon dioxide and methane
iii. 1.Greenhouse gases are important to humans because they help regulate the Earth's temperature and make it suitable for life.
2 .They play a role in agriculture by helping plants grow.
3b. The four basic components of the mammalian skeleton are bones, joints, cartilage, and ligaments.
3.
(a)
(i) Greenhouse gases are gases in the Earth's atmosphere that can trap heat from the sun, leading to the greenhouse effect. Two examples of greenhouse gases are carbon dioxide (CO2) and methane (CH4).
(ii) Greenhouse gases are important to humans because they help regulate the Earth's temperature by trapping heat, which keeps the planet warm enough to support life. They also play a crucial role in agriculture by enhancing the growth of plants through the greenhouse effect.
(b)
Four basic components of the mammalian skeleton include bones, cartilage, ligaments, and tendons.
(c)
(i) Heaping soil around the base of a growing plant is called "hill planting."
(ii) Replanting at spots where seeds failed to germinate is called "reseeding" or "replanting."
(iii) Exposing seedlings to harsh weather conditions before transplanting is often referred to as "hardening off."
(iv) Cutting excess plant parts is known as "pruning."
(v) Reducing overcrowding of seedlings on a nursery is called "thinning."
(d)
(i) Three harmful effects of radioactivity include radiation sickness, increased risk of cancer, and genetic mutations.
(ii) Radioactivity is the process by which unstable atomic nuclei decay, emitting radiation in the form of particles or electromagnetic waves.
4.
(a)
(i) Hay is dried grass or legumes that are typically stored for later use as animal feed. Silage, on the other hand, is fermented green forage, often stored in a silo. The main difference is the moisture content and preservation method.
(ii) Three sources of protein in poultry feedstuff are soybean meal, fish meal, and corn gluten meal.
(b)
(i) The energy the body will have at a height of 5 m above the ground can be calculated using the gravitational potential energy formula: E = m * g * h, where E is energy, m is mass, g is acceleration due to gravity, and h is height.
(ii) The velocity of the body at a height of 5 m above the ground can be calculated using the equation: v = sqrt(2 * g * h), where v is velocity, g is acceleration due to gravity, and h is height.
(c)
(i) Three benefits that humans derive from the nitrogen cycle include nitrogen fixation by legumes improving soil fertility, the availability of nitrogen for plant growth, and the role of nitrogen in the synthesis of proteins and DNA.
(ii) Two human activities that affect the nitrogen cycle are the excessive use of synthetic fertilizers, which can lead to nitrogen runoff and water pollution, and the burning of fossil fuels, which releases nitrogen oxides into the atmosphere.
(d)
(i) To confirm that a colorless liquid in the laboratory is water, perform a simple test like adding a small amount of anhydrous copper(II) sulfate (white) to the liquid. If the copper sulfate turns blue, it confirms the presence of water.
(ii) Two stages in the large-scale water treatment process are coagulation/flocculation and sedimentation.
5.
(a)
(i) To calculate the mass of ammonium chloride crystals needed for a 200 cm³ aqueous solution with a concentration of 0.5 mol dm³, you can use the formula: mass = moles × molar mass. First, calculate the moles of ammonium chloride: moles = concentration × volume (in dm³). Then, use the molar mass of NH4Cl to find the mass.
(ii) Two apparatus that will be needed for the preparation of the solution are a balance for measuring the mass of ammonium chloride and a beaker for mixing the solution.
(b)
(i) Doping in electronics involves intentionally introducing impurities into a semiconductor material to alter its electrical properties. It can make a semiconductor more conductive (n-type doping) or less conductive (p-type doping).
(ii) The charge carriers in semiconductors are electrons (in the conduction band) for n-type doping and holes (vacant electron positions in the valence band) for p-type doping.
Q1
1a. (I) The binomial system of nomenclature is a way of naming living organisms using two words. It's like giving them a first and last name! For example, humans are called Homo sapiens. 🌿🔍
1.a (ii) The binomial system of nomenclature is a way of naming living organisms using two words. For example, humans are called Homo sapiens. B. maize is known as Zea mays. 🌽🔍
1.a (iii) Two scientists associated with the classification of living and non-living things are Carl Linnaeus and Carolus Linnaeus. 🌿🔬
1. b(i) An ionic bond is a type of chemical bond where atoms transfer electrons to form ions. It's like a friendship where one gives and the other takes
1.c(i) A single fertilizer refers to a type of fertilizer that contains only one nutrient, such as nitrogen (N), phosphorus (P), or potassium (K). It's like a specialized nutrient boost for plants
1.c(ii) Sure! Two examples of single fertilizers are urea, which is a nitrogen-based fertilizer, and superphosphate, which is a phosphorus-based fertilizer.
1. d(i) When evaporation happens, liquid turns into vapor and takes away heat energy from the surroundings. This process cools down the environment. It's like sweating on a hot day, making you feel cooler
1. d(ii) Sure! Two practical examples where evaporation leads to cooling are sweating, which cools down our bodies when the sweat evaporates, and the use of evaporative coolers, which work by evaporating water to cool the air in hot and dry climates. It's like nature's way of keeping things cool
5ci. Immovable Joint: The skull sutures, such as the coronal suture, are examples of immovable joints in the human body.
Movable Joint: The knee joint is an example of a movable joint in the human body.
5cii. Diaphragm: The diaphragm is responsible for the main muscular action involved in breathing. When it contracts, it flattens and creates a negative pressure in the chest cavity, allowing for inhalation.
Intercostal Muscle: Intercostal muscles help expand and contract the ribcage during breathing. They play a crucial role in the expansion of the chest cavity during inhalation and the contraction during exhalation.
Ribs: Ribs protect vital organs in the chest, such as the heart and lungs, from injury and provide structural support to the chest cavity. They also play a role in aiding the expansion and contraction of the chest during breathing.
Question 3
3ai. Greenhouse gases are gases that trap heat in the Earth's atmosphere, like carbon dioxide and methane.
ii.carbon dioxide and methane
iii. 1.Greenhouse gases are important to humans because they help regulate the Earth's temperature and make it suitable for life.
2 .They play a role in agriculture by helping plants grow.
3b. The four basic components of the mammalian skeleton are bones, joints, cartilage, and ligaments.
