Express the answers to the following calculations inscientific notation:(a) 145.75 + (2.3 × 10−1)(b) 79,500 ÷ (2.5 × 102)(c) (7.0 × 10−3 ) − (8.0 × 10−4) (d) (1.0 × 104 ) × (9.9 × 106)

Q: Which of the following items is a physical property?     the combustion of gasoline     the…

A: Whthe following items is a -       the combustion of gasoline - Chemical property   the corrosive…

Q: The radius of a copper (Cu)atom is roughly 1.3 x 10 10 two separate copper atoms? (Assume there are…

A:

Q: Classify the following as physical or chemical change: When a solution of concentrated HCl(aq) is…

A: For question 3, we have to find the whether the addition of concentrated HCl(aq) to water is a…

Q: Electrical energy is usually measured in kilowatt-hours, kWh. A Watt is 1 joule per second. A…

A: Ans.    1 Cal = 4.184 joules   776 Cal =776×4.184 joules                =3246.784 joules      Now…

Q: The diagram on the left represents the result of a process. Which of the diagrams [(i) to…

A: The diagram which represent the starting material if the process were physical, and which could…

Q: The radius of a copper (Cu)atom is roughly 1.3 x 10 10 two separate copper atoms? (Assume there are…

A: Given that: Radius of copper atom=1.3×10−10m

Q: Which of the following objects has the greatest kinetic energy?a 5000 kgtruck moving at 10 km/h (

A: Kinetic energy = ½ mv2 M = 5000 kg, V = velocity = 10 km /h

Q: Suppose that instead of using the cylindrical rod of Example 1-2 to prepare a 1.000 kgmass we were…

A: The volume of a spherical ball will be directly proportional to the cube of the radius of the…

Q: A chemist tries to dissolve a solid ionic compound called "X" in water at 25°C. He adds 100 mL of…

A: Solution is a homogenous mixture of solute and solvent. Solute is the component present in lesser…

Q: If one mixes 50 cm3 of EtOH and 50 cm3 of H2O at room temperature; will the total volume of the…

A: Partial molar volume give the answer for this question. Water H2O Ethanol C2H5OH

Q: 2. As part of the process in the production of a perfume, a certain substance with water is…

A: It follows first order kinetics.  So, ln(a0/at) = kt  Or, k = (1/t)ln(a0/at) .....(1)  Here, a0 = 75…

Q: when you mix 20ml sugar and 50ml water in a 250ml beaker, what is the volume of the sugar and water…

A:

Q: It has been estimated that there is 4 x 10^-4 mg of gold per liter of seawater. At a price of…

A: 1 km3 = 1015 cm3. 1 cm3 = 1 milliliters 1 L = 1000 milliliters 1 L = 1000 cm3 1015 cm3 can be…

Q: 11) Sn,S, is written as SnS, instead by dividing by the common factor of 2 terli ens O

A:

Q: Example :-A solution contains 3.30 gm of Na2CO3.10H2O in each 15 ml. What is its molarity? What is…

A: The concentration of a solution can be expressed as the molarity, (w/v)%, (v/v)%, molality or…

Q: Twenty grams of potassium dichromate (K₂Cr₂O) is dissolved in 150 mL of water What is its normality…

A:

Q: Q2// The four-cylinder engine of a light truck owned by a utility company has been converted to run…

A:

Q: a) State the number of significant figures in the following examples: i) 17.4 x 104 mg ii) 0.00650…

A: Given,

Q: two solvents A (d=0.859 g/mL) and B (d = 1.290 g/mL) are immiscible. When 12.0 mL of solution A is…

A: Density=1.0314g/ml

Q: The temperature of a liquid is 15oC.  What is this in K?

A: Celcius is one of the units of temperature.  The SI unit of temperture if Kelvin.

Q: 7. Which of the following processes are chemical changes? Give reasons. a) Making a Salt Solution.…

A: There are two types of changes that can occur in a process: S.No Physical changes Chemical…

Q: A combination of at least two materials, one of which is a metal whose properties are different from…

A: Alloy is the combination of  two metals or a metal and  non metals to form a new product with…

Q: The process in which adding a chemical compound to another chemical compound and observe physical…

A: Since we are observing physical changes only. Physical properties reflect quality of a substance.…

Q: Will 260 milligrams of calcium carbonate raise the pH of 75.0 milliliters of stomach fluid from a…

A: Calcium carbonate is CaCO3 which is a diacidic base. The balanced equation for the neutralization…

Q: A 0.2121-g sample of pure NazC,O, (134.00 g/mol) was titrated with 43.31 mL of KMNO4. What is the…

A: Given, mass of Na2C2O4 =0.2121 g moles of Na2C2O4 =0.2121 g132 g/mol=1.58 ×10-3 mol Volume of KMnO4=…

Q: What is the symbol for the quantity defined by this expression: - log [H3O+]

A: This expression tells that the blank is the negative logarithm of the hydronium ion concentration.…

Q: A solution of 20.91% by weight H;SO, has a specific gravity of 1.150. What is the normality of this…

A:

Q: Gypsum is the hydrate of calcium sulfate, CaSO4 · 2 H2O.  It is the primary material in sheet rock,…

A: Molar mass of CaSO4.2H2O = Atomic mass of Ca + Atomic mass of S + 4 × Atomic mass of Oxygen + 2 [ 2…

Q: Whilst working in the pharmacy aseptic unit you are asked to prepare 5 litres of a solution…

A: Molarity will be constant through out the solution any time.

Q: what is the mass of calcium carbonate reacted?

A: Given, Mass of marble before reaction 3.0g Mass of marble after reaction 1.8g

Q: H20 KMNO,

A: Given reaction is syn dihydroxylation of alkene with KMnO4(potassium permanganate)

Q: Knowing that 1 calorie = 4.184 joules and 1kWh = 3.6 x 106 Joules, convert the following: 2739…

A: Given: 1 calorie = 4.184 joules 1kWh = 3.6 x 106 Joules Toconvert: 2739 teraWh into nanocalories.

Q: What is the mass of a golf ball traveling at 71.8 ms1? The rest mass of a golf ball is 45.9 g, as…

A: 45.9 g is the answer

Q: Gypsum is the hydrate of calcium sulfate, CaSO4 · 2 H2O.  It is the primary material in sheet rock,…

A:

Q: 1. HNO,„H,SO, 2. СH, CІ, AICI,

A: The first step reaction is the nitration of benzene : Nitration happens when one (or more) of the…

Q: A cylindrical bar was found at the bottom of a storage tank of unknown composition. The material had…

A: We have to calculate the density of material.

Q: The three sets of units for expressing density (or concentration, as in “mass of solute per unit…

A: The density is the mass mass of solute per unit volume of solvent. Therefore, it can be expressed in…

Q: Which of the following statements is FALSE? O The mass percentage of calcium in calcium phosphate is…

A: Answer - The False statement is (e) and (a) The mass percentage of calcium in calcium phosphate is…

Q: substance reacts violently with water. The substance melts at 73.59 oC. The substance was named…

A: 1. Physical properties are used to observe and describe matter. Physical properties include:…

Q: Electrical energy is measured in kilowatt hours, kWH. A watt is 1 joule per second, a kilowatt is…

A: Killowatt hour is an unit of energy . Energy has another unit, calorie.  Different units can be…

Q: 2) For a separate job, you are asked to assemble a number of tricycles by attaching wheels to the…

A: No. Of complete frames=70 No.of rear wheels=123 No. Of front wheels=74 For 1 complete tricycle, no.…

Q: 2) Use the following data to place the fictitious metals Q, R, T, X, A, and E into an activity…

A: The series in which metals are arranged in decreasing order of their reactivity is known as…

Q: Carry out each of the following calculations, paying special attention to significant figures,…

A: Significant figures can be defined as a total number of digits in number including the last digit…

Q: Directions: Match the following terms in column A to the description that matches them in column B.…

A:

Q: Which intensive physical property is observed when the droppings of a person seated inside a closed…

A: Intensive property is the one  does not depend on the amount of substance.

Q: In compounding a prescription, a pharmacist weighed 0.05 g of a substance on a balance insensitive…

A: We have, Weight of the substance measured = 0.050 g Smallest quantity that can be measured = 0.004 g…

Q: What is the force in newtons acting on a 5.2 kg package of nails that falls off a roof and is on its…

A: Since ,          F= m x a  where F= force          m= mass         a = acceleration

Q: Is the concentration of a solution an intensive or an extensive property?

A: The concentration of a solution with defined composition is independent of the size of the system.…

Q: What is the average flow rate in cm3/s of gasoline to the engine of a car traveling at 100 km/h if…

A: Volume of gasoline consumed in 1 hour = 100 km/h10 km/L =100/10 = 10 L/h Average flow rate of…

Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.