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- Scientific models do not describe reality. They are simplifications aid therefore incorrect at some level. So why are models useful?Suppose that you are closing a cabin in the north woods for the winter and you do not want the water in the toilet tank to freeze. You know that the temperature might get as low as 30. C, and you want to protect about 4.0 L water in the toilet tank from freezing. Calculate the volume of ethylene glycol (density = 1.113 g/mL; molar mass = 62.1 g/mol) you should add to the 4.0 L water.A sample of matter that is “rigid” has (stronger/weaker) forces among the particles in the sample than does a sample that is not rigid.
- 7.The word pour is commonly used in reference to liquids but not to solids or gases. Can you pour a solid or a gas? Why or why not? If either answer is yes, can you give an example?What is the main difference between electrostatic forces and gravitational forces? Which is more similar to the magnetic force? Can two or all three of these forces be exerted between two objects at the same time?Define the terms renewable and nonrenewable as applied to energy resources. Which of the following energy resources are renewable: solar energy, coal, natural gas, geothermal energy, wind power?
- 1. Iron metal rusts in an atmosphere of moist air. a. Physical Propertyb. Chemical Property 2. Mercury metal is a liquid at room temperature.a. Physical Propertyb. Chemical Property3. Silver salts discolor the skin by reacting with skin protein.a. Physical Propertyb. Chemical Property4. Nickel metal dissolves in acid to produce a light green solutiona. Physical Propertyb. Chemical Property 5. Potassium metal has a melting point of 63°C.a. Physical Propertyb. Chemical Property6. Titanium metal can be drawn into thin wires.a. Physical Propertyb. Chemical Property7. Silver metal shows no sign of reaction when placed in hydrochloric acid.a. Physical Propertyb. Chemical Property8. Copper metal possesses a reddish-brown color.a. Physical Propertyb. Chemical Property9. Beryllium metal, when inhaled in a finely divided form, can produce serious lung disease.a. Physical Propertyb. Chemical Property3. Carefully put an egg in a glass half filled with vinegar. Replace the vinegar on the second day. Place the covered glass with the vinegar and egg in a safe place for one week without disturbing it. After one week, pass a light through the egg using a flashlight. N.B. DO NOT BOIL AND EAT THE EGG. A. Results and observation. Equation: HC2H3O2 + CaCO3 calcium acetate + H20 + carbon dioxide B. Calculation: If 9.02 x 1024 particles of vinegar (HC2H3O2)HC2H3O2) is added to 16.5 moles of eggshell (CaCO3) and 6.35 moles g of calcium acetate is formed. What are the (a) theoretical yield, (b) actual yield and (c) percent yield6.) What is the ideal body weight of an individual which is 5 feet tall? a. 170kg b. 162 kg c. 140kg d. 152 kg 7.) As a student your physical activity is considered which of the following? a. bed rest b. light c. moderate d. sedentary 8.)This element regulates several important physiologic and biochemical processes including neuromuscular excitability, blood coagulation, secretory process, membrane integrity, and plasma membrane transport a. calcium b. magnesium c. iron d. potassium 9.) A micro mineral which is an essential component of blood a. Cobalt b. chromium c. molybdenum d. iron 10.) Fiber requirements are provided by which of the following? a. Meat b. Milk c. sweets d. fruits and vegetables
- I need help on this it’s hard and I keep trying but it still don’t work.?Emissions product of gasoline fuel ..............from the exhaust pipe are Co2, MP. Aldehydes, Street Dust. Carbon monoxide gas (CO), NH3, (Pb) Lead. O Nitrogen oxides (NOx), N20. Sulfur dioxide (SO2), MP. OMatter can be described by 2 types of properties: Y0geneal and Y z0oroper 18. A(n) is a property of matter one can observe or measure without changing its identity. Examples of this are and 19. A(n) is a property of matter one can observe about how it and interacts with other substances. Examples of this are and changes. 0. Matter can change in 2 different ways: 1. A(n) is a change where no new substances are produced. and Examples of this type of change are is a change where new substances are produced. A(n) and Examples of this type of change are ange is a chemical