Chemistry, 21.01.2021 04:30 jjgccc

When making observations using two different instruments, it is important to keep in mind which tool will allow you to be the most accurate. The value with more significant digits othen gives a more accurate reading. The following activity allows you to find the diameter of a circle using two rulers with different markings.
Click on the image to explore this activity depicting the level of precision available for measurements taken using different scales.
Click "Start"and measure the diameter of the blue circle by dragging it to one of the
rulers. Enter the diameter using an appropriate number of significant figures and click
"S
Suan
le
0.000
Shr
Ruler A
Click to launch activity
Ruler B
II ليييييييييييييييييلييييلييييلييييلي يييلييليييي
After opening the activity, click the Start button, and then drag the circle over one of the rulers to find its diameter
To count the number of significant figures in a value, use the following rules:
1. Nonzero integers are always significant.
2. Zeros between nonzero integers are always significant
3. Zeros that precede a decimal point are not significant
4. Zeros that follow a decimal point are not significant it and only if the number before the decimal point is zero. For example, in the number 0.01, neither zero is significant
5. Zeros after a nonzero digit are known to be significant it and only if the number contains a decimal point. If the number does not contain a decimal point, the zeros are either not significant or are ambiguous. For
example, the number 500. has three significant figures

Answers: 2

Show answers

Another question on Chemistry

Chemistry, 22.06.2019 04:00

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

Answers: 2

Answer

Chemistry, 22.06.2019 05:50

Calculate the number of molecules present in 0.750 mol of mgo.

Answers: 3

Answer

Chemistry, 22.06.2019 19:20

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

Answers: 1

Answer

Chemistry, 22.06.2019 21:20

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .

Answers: 2

Answer

You know the right answer?

When making observations using two different instruments, it is important to keep in mind which tool...

Questions