2. Express the number 500 cm so it is clear that there are only two significant figures.

Q: A chemistry student needs 25.0 mL of ethanolamine for an experiment. By consulting the CRC Handbook…

A: The objective of this question is to calculate the mass of ethanolamine that the student should…

Q: What is the volume of a balloon, in cm³, with a circumference of 37.8 cm? Report your answer to…

A: The objective of this question is to calculate the volume of a balloon given its circumference. The…

Q: Perform these operations in scientific notation with the appropriate number of significant figures.…

A:

Q: A flask containing 11.7 mL of a liquid weighs 132.8 g with the liquid in the flask and 124.1 g when…

A: Density = mass of liquid (gm) / volume of liquid.(ml)   ….(1) Volume of liquid = 11.7 ml     …….(2)…

Q: significant figures

A:

Q: A cylindrical tube 10.2 cm high and 1.20 cm in diameter is used to collect blood samples. How many…

A: Height of cylindrical tube, h=10.2 cm Diameter, d=1.20 cm Radius, r=1.20/2=0.60 cm Volume =?

Q: Calculate the mass in grams of 92.6 ml of diethyl ether, an anesthetic that has a density of 0.713…

A: Density is defined as mass per unit volume of a substance. It is an intensive property which depends…

Q: Carry out the following conversions. Report your answers to the correct number of significant…

A: One measurement can be converted from one unit to the other unit by conversion factor. It will be…

Q: The density of gold is 19.3 g/cm3. Johan van der Smoot determines the mass of an irregularly shaped…

A:

Q: A flask containing 7.56 mL of a liquid weighs 164.7 g with the liquid in the flask and 156.5 g when…

A: The density of any substance is the ratio of its mass to its volume. therefore ,

Q: Evaluate the expression and report the answer to the proper number of significant figures. log (9.9…

A:

Q: Perform the following calculation and input the answer expressed to the correct number of…

A: Since, When multiplying or dividing, the final answer is rounded to the same number of significant…

Q: A cheetah ran 1000.0 meters in 33.27 seconds, how fast is it running in miles per hour (MPH)? Note:…

A: Given information: 1 miles = 1.609 km              = 1609 m 1 hour = 3600 sec

Q: Carry out the following operations provide the answer with the correct number of significant…

A: Answer  Significant figures - Significant figures of a number in positional notation are digits in…

Q: A rectangular block of iron was found to be 19.00 cm wide, 0.31500 m high, and 720.026 mm deep. Iron…

A:

Q: Complete the following problems.  Show the correct number of significant figures and units in your…

A: As, we know that: 1 cm3 =1 g. This concept we have to apply on this question ,including significant…

Q: The density of copper is 8.97 g/cm^3. What is the volume, in mL, of a 1.00 kilogram mass of pure…

A: 1.00 kg of copper is equal to 1000.0 g of copper. And 1 mL is equal to 1 cm3.

Q: Carry out each calculation and give the answer using the proper number of significant figures.   a.…

A: The calculations given are, a) 0.20635136 b) 220075.9

Q: A piece of cardboard is 12.0 cm long and 6.3 cm wide. What is the area of this piece of cardboard in…

A: Given,A piece of cardboard is 12.0 cm long and 6.3 cm wide.

Q: What is the volume of iodine if it has a mass of 2.5kg and a density of 4.93/cm to the 3rd power?…

A: Answer of this question :-

Q: How many significant figures are in the number 9.80 x 104?

A: Significant figures: The number that makes it easy to read or write in simple form is called…

Q: How should he record his answer, to the correct number of significant figures?

A: In multiplication rounding off the answer to the least number of significant digits given in the…

Q: Lithium is the least dense metal known (density = 0.53 g/cm3). What is the volume (in L) occupied by…

A: Given,the mass of lithium ( Li ) metal = 2.30 x 103 gdensity of lithium ( Li ) metal = 0.53 g/cm3

Q: To the correct number of significant figures calculate log(4.399x104).

A: Significant figures are the digits of a number that have meaning in terms of accuracy or precision.

Q: [(284.1 x 105) - (1.300 × 10³)] × 2.8988 Express your answer to the appropriate number of…

A: The equation given is, => [(284.1 X 105 ) - (1.300 X 103)] X 2.8988

Q: Do the following calculations to the correct number of significant figures: MUST follow the rules…

A: “Since you have posted a question with multiple sub-parts, we will solve the first three subparts…

Q: Perform the following calculations and express each answer to the correct number of significant…

A: The solution is as follows :

Q: The number 4.0 × 105 has significant figures.

A: Number of significant figure in 4.0 ×105?

Q: 1 sig fig 2 sig figs 3 sig figs 4 sig figs 5 sig figs Answer Bank 0.006 0.030 890020 140 4.050 11020…

A: Significant figures:- preceding zero after decimal doesn’t count. For example 0.008 can be written…

Q: 1.  A 22.65-g sample of a solid is placed in a flask. Ethanol is added to the same flask having the…

A: Given that -  Mass of sample of a solid = 22.65 g  Volume of ethanol + solid = 45.00 mL  Mass of…

Q: A physical chemist measures the temperature T inside a vacuum chamber. Here is the result. T=-21.8…

A: Given, Temperature, T = -21.8 °C The temperature value in S.I units is :

Q: A cyclist rides at an average speed of 26 miles per hour, If she wants to bike 180 km, how long (in…

A: Please find your solution below : Speed is defined as the distance travelled per unit time. In other…

Q: The density of tungsten metal is 19.35 g/cm3g/cm3. Part A What is the density of tungsten in pounds…

A:

Q: If you are walking at a speed of 2.5 miles an hour how fast are you moving in kilometers a min.…

A: The speed in kilometers (km) per minutes, it is to be determined. Given: speed = 2.5 miles/hr 1 mile…

Q: 6. A bicycle has a 56 cm frame. What is this frame size equal to in inches? (1.00 in = 2.54 cm. Note…

A:

Q: Answering to the correct number of significant figures, what is 5.80 x 120? A) 696 B) 700 C) 7.0 x…

A: The given equation is, 5.80 × 120 = 696

Q: How can the number 642,000 g be written to indicate that there are 4 significant figures?

A: The number 642000 has three significant figures.

Q: Carry out the following operations and express the answer with the appropriate number of significant…

A: For multiplication and division: Check the LEAST number of significant figures. For addition and…

Q: A 20.0 % by mass solution of phosphoric acid (H3PO4) in water has a density of 1.114 g/mL at 20°C.…

A: Molarity is calculated by using formula : molarity = moles of solute / volume of solution ( L)  So,…

Q: I think I did a calculation wrong but I am having trouble understanding significant figures. In…

A: Significant figures: These are the digits of a number that are useful in terms of accuracy and…

Q: Perform the following calculations: a) 14.86 ml + 15.0 ml + 14.980 ml = b) (42.927 g/ml)(9.00 ml)…

A: According to the rule for significant digits in addition and subtraction, the number of significant…

Q: If I have these values and need to calculate percentage, what are the significant figures I need?…

A:

Q: You measure the distance between to cities to be 42.0 miles. You need to send this data to Brazil…

A: Convert 42.0 miles to km ?

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.