## Which Of The Following Is A Pure Substance

Which Of The Following Is A Pure Substance – 2 It’s your turn! Coffee is a homogeneous mixture. When you add sugar and soluble sugar… coffee becomes a heterogeneous mixture. The coffee is still a homogeneous mixture. Coffee, once a pure mixture, is no longer a pure mixture. Coffee, once an element, is no longer an element. Sugar reacts with water to form new compounds. Answer: B

If bleached, some colored substances can change the color of grape juice left in open, unrefrigerated containers, acidify when heated strongly, and turn sugar dark brown D. In cold weather, water can condense on individual windows. The inner surface of the grid E When lit with a match in open air, paper burns Answer: D

## Which Of The Following Is A Pure Substance

Freeze water into ice cubes Dry ice evaporates at room temperature Inhale a slice of bread Dissolve sugar in hot coffee Destroy an aluminum can Answer: C

## Question Video: Identifying Which Substance Is Chemically Pure

Squeeze oranges to make orange juice Popcorn melts butter Separate sand from gravel Hydrogen peroxide breaks down into water and oxygen Ozone becomes a gas at room temperature Answer: D

Which of the following is not a feature of reinforcement that describes an unknown sample? It is solid at 25 °C. Its density is 1.38 g/cm3. It melts at 62.0°C. The volume is 0.52 cm3. It is shiny. Answer: D

10 Convert °C to K and °F Find the equation that relates a given quantity to the quantity you want to find. and calculate K = °C K = K = K Find the equation that relates the given quantity to the quantity you want to find Given: Find: Equation: 40.00 °C °F Solve the equation for the quantity you want to find Substitute and calculate.

Temperatures in Death Valley can rise above 120° F. What is the temperature in Kelvin? 393 K -153 K 322 K 234 K Answer: C

## Classification Of Matter Answer Key Pdf

All non-zero numbers are significant. For example, there are 4 signals. As shown. Zero between significant non-zero numbers. For example, 20,089 or × 104 has 5 sig. If the number has a decimal point, such as 500. or 5.00 × 102 with 3 terms, zero-tailed figs are always considered significant digits. Figure 12

The last zero in a number without a decimal point is unimportant, for example 104, 956, 000 or × 108 has 6 sig. As shown. For example, the last zero to the right of the significant decimal point has 3 sig. As shown. For example, a leading zero to the left of the first zero is never considered valid, or 1.2 × 10-4 has 2 signals. As shown.

14 Learning check How many significant figures are there in each of the following numbers? Scientific notation # Sig. As shown. 413.97 0.0006 161,000 3600. × 102 5 6 × 10–4 1 7 1.61 × 105 3 3.600 × 103 4

A student measured the mass of pennies four times and recorded the following data. If the actual mass of a penny is g, what can the data say? Test No. Mass, g 1 2.5104 2 2.5106 3 2.5102 4 2.5109 The data are accurate and precise. The data is imprecise and inaccurate. The data is accurate but not exact. The data is imprecise but accurate. Answer: D

### Mixture Or Pure Substance? Worksheet

19 Learning check Circle each of the following in three significant figures. Use scientific notation when necessary. 37.459 7.665 37.5 or 3.75 × 101 5.43 × 106 133 or 1.33 × 102 8.77 × 10–4 7.66

20 It’s your turn! Round to four significant figures and expressions in scientific notation. 5.64  10-2 5,000  10-3 5,645  10-4 5,645  10-3 Answer: E

Number of significant digits in the multiplication and division answer = number of significant digits in the least precise measure, for example × 31.4 × 4 sig. As shown. × 3 signal. As shown. × 5 signal. As shown. = 3 signals. As shown. For example, ÷ 0.008 4 sig. As shown. ÷ 1 signal. As shown. = 1 signal. As shown. = 5620 = 5.62×103 = 700 = 7×102

22 It’s your turn! Give the following calculations for the correct number of significant figures. 1.212 1.2 1 answer: D

#### What Are Examples Of Pure Substances?

Addition and subtraction answers have the same number of decimal places as the least number of decimal places. For example 319.5 4 decimal places 1 decimal place 3 decimal places 336.9 397 – 0 decimal places 2 decimal places 0 decimal places 124

24 Learning checks For each calculation, give the answer to the correct number of significant figures. 10.0 g g g = °C – °C = 327.5 m × 4.52 m = g ÷ ml = 11.3 g or 1.13 × 101 g 0.004 °C or 4 × 10–3 °C 1.48 × 103 m g/mL or 6.627 × 6.627

– Evaluation, the result must be shown to: tenth digit 100,000 digit 100,000 digit 100,000 Answer: C

27 Learning Checks For the calculation below, answer to the correct number of significant figures = 2 × 10–4 m/s2 = cm3/s

## Which Of The The Following Statements Are True For Pure Substance ? (i) Pure Substance Contain Only One Kind Of Particles (ii) Pure Substance May Be Compounds Or Mixtures (ii) Pure Substance

28 Exact numbers Exact numbers have unlimited digits. A number whose value is completely determined is an exact count of discrete objects… Atom For example, an integer that is part of an equation. Radius = Diameter/2.0000… Some quantities (… cm = 1.000… m) Some conversion factors are defined as quantities, while others are not. In the example on this slide, the number is deterministic and therefore has an infinite number.

Express the following answer with the correct number of significant figures: 3 ft 3.0 ft 3.00 ft 3000 ft ft 36.00 There are four figures. As shown. Conversion is live. So the answer has four signals. As shown. Answer: D

30 It’s your turn! For the calculations below, give the answer to the correct number of significant figures. 179 cm2 1.18 cm 151.2 cm 151 cm cm2 Answer: D

Read the water level to the correct number of significant figures. Read the length of the metal strip with the correct numbers. answers. _____________ A) 5 mL B) 5.3 mL C) 5.32 mL D) mL E) mL A) 20 cm B) 15 cm C) 15.0 cm D) cm E) cm Read the temperature with the correct number of significant figures . A) 87°C B) 87.2°C) 87.20°C D) °C E) °C 5.3; 15.00; 87.20; 15.0 Read the length of the metal strip with the correct number of significant figures.

#### Solved:classify Each Of The Following As A Mixture Or A Pure Substance. A. Water B. Blood C. The Oceans D. Iron E. Brass F. Uranium G. Wine H. Leather I. Table Salt

Example: Change m to mm. The relation is 1 mm = 1 × 10–3 m. Two conversion factors can be made because the one on the left is used to go from m to mm. = 97 cm

Start with the basic equation 1 cm = 0.01 m Now cubes on both sides Units and counts (1 cm)3 = (0.01 m)3 1 cm3 = 1 × 10–6 m3 Two conversion factors can be made or 3.5 × 106 cm3

37 It’s your turn! The Honda Insight Hybrid Electric is rated at 56 miles per gallon. Is this rating expressed in kilometers per litre? 1 gal = L 1 mile = km 1.3 × 102 km L-1 24 km L-1 15 km L-1 3.4 × 102 km L-1 9.2 km L-1 Answer: B

38 It’s your turn! The basketball has a volume of 3. Convert it to mm3. 1.101  10-2 mm3 7.104  106 mm3 7.104  104 mm3 1.101  104 mm3 1.101  106 mm3 Answer: B

### Solved 7. Classify The Following Substances As Pure

What is the density of a solution with a mass of 13.5 g and a volume of 15.8 mL? 1.17 g/ml 0.213 g/ml 4.69 g/ml 0.854 g/ml Answer: D

A student considers a piece of gold whose volume is cm3. He found that it weighed 212 grams. What is the density of gold? 19.3 g/cm3 Another student has a gold piece with a volume of 1.00 cm3. What weight does it have? 19.3 g What if the volume is 2.00 cm3? 38.6 g

A substance with a mass of 10.0 g and a volume L A substance with a mass of 5.00 g and a volume of cm3 A substance that sinks in ethanol but floats in water Answer: C

Determine whether a 3.15 g mass 3.15 g ring displacing cm3 of water is platinum. This has to do with the quantity given the quantity you are looking for. Solve the equation for the quantity you are looking for, look for the correct units, substitute and calculate. Compare that to the accepted value for the dense property Platinum Density = 21.4 g/cm3 so not platinum

#### Classify The Following Materials Into Pure Substances And Mixtures,airironwatersoillemonadegoldoxygen​

43 Learning to check 1. The density of glass is 2.2 g/cm3. How much volume can a 35g glass hold? 2. What is the weight of 400.cm3 of glass? 16. g 8.8  102 cc

44 It’s your turn! Titanium is a metal used to make artificial joints. Yes