Uncertainty is at least +1/10 of smallest interval.

Slides:

Advertisements

Similar presentations

Celsius-to-Fahrenheit: F = 1.8C + 32

Advertisements

At what temperature are the Celsius and Fahrenheit readings equal?

D = (48.0 g) / (6.0 mL) = 8 g/mL  8.0 g/mL

QUESTION: A 25.0 gram sample of a compound is found to be 24% chlorine by mass. What is the percentage of chlorine in a 50.0 g sample of the compound?

Bohr assumed electrons move around the nucleus in circular orbits.

QUESTION: Which of the following elements is a post-transition metal? A. silicon, B. lead, C. sodium, D. chromium SCRIPT: Which of the following.

A mole of atoms contains exactly 6.02x1023 atoms.

QUESTION: How many ways can the magnetism generated by the orbital motion of an electron in a 3p orbital be oriented? A. 1, B. 3, C. 5, D. 7 Magnetism.

QUESTION: Which of the following elements is a transition metal? A. silicon, B. lead, C. sodium, D. chromium SCRIPT: Which of the following elements.

SO3: one Sulfur atom: 16 protons

Uncertainty of g: tenths place

A. 2.40x103 km min-1, B. 6.67x10-1 km min-1 C km min-1

Which of these is the formula of a reactant in this reaction?

General strategy for converting units:

Ions are formed by loss or gain of electrons.

To convert Celsius reading to Fahrenheit: F = 1.8C + 32

Uncertainty of 2500 mL: hundreds place [Larger]

A measurement of 2.50 mm is equivalent to ...

QUESTION: Which of the following is a metalloid? A. Potassium, B. Silicon, C. Iron, D. Helium SCRIPT: Which of the following is a metalloid? A.

In nature, substances are typically mixed.

Mass of proton or neutron: 1.0 u Mass of electron: u

Trends in atomic size: opposite of trend in ionization energy

CLICK Here are some possible molecular formulas When x=1, we have NO2.

QUESTION: Which of the following elements is the best electrical conductor? A. carbon, B. germanium, C. manganese, D. iodine SCRIPT: A. carbon,

A. 0.8 g/mL, B g/mL, C g/mL, D. 1.3 g/mL

To construct the ground state electron configuration,

There are 3 orbitals in a p subshell (ml = -1, 0, or +1).

A. unsaturated, B. still saturated, C. supersaturated

Ions are formed by loss or gain of electrons.

QUESTION: The volume of a sphere of radius r is given by the formula: V = (4/3) ()(r3) The radius of a sphere is measured to be 5.00 cm. What is.

A. 1.29x10-3 mg/mL, B mg/mL, C. 1.29x10-6 mg/mL

Here’s a general strategy for determining empirical formulas.

QUESTION: Which type of element has the lowest electronegativity? A. a metal, B. a nonmetal, C. a metalloid Electronegativity is a measure of the.

Mathematically, this implies that the ratio of the amount of element

Estimated uncertainty: + (½) (Range)

How many neutrons does an O-18 atom have? A. 8, B. 10, C. 16, D. 18

PAUSE CLICK Let’s examine choice A.

QUESTION: How should the result of the following calculation be reported, assuming that 1.8 and 32 are exact numbers? 32 + (1.8)(2.37) A. 36,

Steric number of C in the structure is 3.

What is the Kelvin temperature equivalent to 50.00oF?

HIGHLIGHT carbon in legend

2. A molecule with no polar bonds is nonpolar.

QUESTION: Assume circles and squares in the figures below represent atoms. According Dalton’s atomic theory, which of the figures below best represents.

The oxygen-to-carbon ratio in that sample is x over 36.0 HIGHLIGHT

What is the Kelvin temperature equivalent to 25.00oC?

To convert Celsius reading to Kelvin: K = C

We can look up isotopic abundance for Mg and find:

Allowed values of principal quantum number (n): positive integers

Which figure below best represents an aqueous solution of CaCl2?

Oxoanions have names ending in “ate” or “ite”

Therefore, the correct answer is A.

QUESTION: Consider the reaction: N2 + 3 H2  2 NH3 How much NH3 is produced if mol H2 is consumed? A mol, B mol, C mol Consider.

The area of a circle is found to be 2.4 cm2. What is the area in m2?

QUESTION: Consider the reaction: N2 + 3 H2  2 NH3 Suppose mol of N2 is used up in this reaction. How much NH3 is produced? A g, B

QUESTION: A sample of matter is heated and found to start melting at 75.0oC. While melting, the sample temperature continues to rise to about 85.0oC.

Ions are formed by loss or gain of electrons.

QUESTION: How should the result of the following calculation be reported? (0.0050)(39.0) A. 0.20, B. 0.21, C , D

For which pair of molecules does dipole-dipole interaction occur?

give us something that is light blue, not yellow.

CLICK PAUSE END RECORDING

A. an element and two compounds, B. two elements and a compound,

Here’s a general strategy for determining empirical formulas.

X-78: mass=78.0 u, abundance = 30.0%

0.800 m has three significant digits

What do molecules and polyatomic ions have in common?

How many moles of CH4 are in 4.00 g of CH4?

What is the mass of 2.00 mol NH3? A g, B g, C g

80.00 g has four significant digits

Mole is a group count (just like dozen).

Which of the following is not a balanced chemical equation?

Presentation transcript:

Uncertainty is at least +1/10 of smallest interval. QUESTION: What is the proper way of reporting the temperature shown on the thermometer scale (Celsius) below? A. 30oC, B. 30.0oC, C. 30.00oC D. 3.0x101 oC Uncertainty is at least +1/10 of smallest interval. Smallest interval: 0.1oC What is the proper way of reporting the temperature shown on the thermometer scale shown here.? Assume that the scale is in degrees Celsius. A. 30oC, B. 30.0oC, C. 30.00oC D. 3.0x101 oC PAUSE 3 seconds. THe way a measurement is reported should imply the uncertainty in the measurement. CLICK For an analog scale, the uncertainty is generally assumed to be at least 1/10 of the smallest interval. CLICK The smallest interval shown on this scale is 0.1 degrees celsius. For example, this is the 30.1 degree mark. and the next mark... CLICK is the 30.2 degree mark CLICK Therefore, the uncertainty of any reading made from this scale is at least 1/0 of the 0.1 degrees. 1/10 of 0.1 is one one-hundredth HIGHLIGHT 0.01oC Therefore, the last significant digit of any reading from this scale should be the digit in the hundredth’s place. Therefore, the correct answer is Choice C, 30.00 degrees celsius. PAUSE CLICK PAUSE END RECORDING Therefore, uncertainty is + (1/10 of 0.1oC), or +0.01oC Therefore, last sig.fig. should be in hundredths place.

Video ID: 1A-3-2 © 2008, Project VALUE (Video Assessment Library for Undergraduate Education), Department of Physical Sciences Nicholls State University Author: Glenn V. Lo Narrator: Funded by Louisiana Board of Regents Contract No. LA-DL-SELECT-13-07/08