ILTS Field #203 Middle Level Science Questions And Answers With Complete Updates
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Course
ILTS 203
Institution
ILTS 203
ILTS Field #203 Middle Level Science Questions And Answers With Complete Updates
Which of the following describes the process skill of concluding?
a. Explaining or interpreting observations
b. Making a determination based on the results of a controlled experiment
c. Reading an instrument during...
ILTS Field #203 Middle Level Science Questions And
Answers With Complete Updates
Which of the following describes the process skill of concluding?
a. Explaining or interpreting observations
b. Making a determination based on the results of a controlled experiment
c. Reading an instrument during an experiment
d. Listing similarities and differences between two objects ANS b. correct
a-inferring
c-quantitative observation
d-comparing
*A chemistry experiment is performed to determine the effect of a nonvolatile solute on the boiling
point of water. Three trials are performed in which 10mg, 20mg, and 30mg of salt are added to 500
mL of distilled water. Each solution is heated in a hot plate, and the elevated boiling points are
recorded. Which of the following correctly identifies the independent and dependent variables?
a. The independent is the amount of salt, and the dependent is the temperature
b. The independent is the amount of water, and the dependent is temperature
c. The independent is temperature, the dependent is the amount of salt
d. The independent is the amount of salt, and the dependent is the amount of water ANS a-correct
dependent is tested and measured where independent is changed or controlled. Salt varies and boiling
point is measured
*Which of the following is NOT true concerning forming and testing hypotheses?
a. A controlled exp. should have only one independent variable
b. A controlled exp. may have several constants.
c. A good hypothesis should take all of the available background material on the topis into
consideration
d. A good hypothesis will not be disproved by testing. ANS d. correct
must be testable (meaning proved and disproved by using a controlled exp. which has one dependent
variable)
,Which is the correct scientific notation for 0.0034050?
a. 34.050 x 10^-3
b. 3.4050 x 10^-2
c. 3.4050 x 10^-3
d. 3.4050 x 10^3 ANS c. correct
has to be lower than 10 and decimal is moving to the left to be correct so negative
*Which has 4 sig-figs?
a. 3,020.5
b. 0.003020
c. 3.2005
d. 0.0325 ANS b. correct
all leading 0s do not count, sandwiched 0s count, trailing 0s in decimals count
a-5
c-5
d-3
What is the correct expression of 91,000 x 87,000 using scientific notation and sig-figs?
a. 7.91 x 10^9
b. 7.9 x 10^9
c. 79.2 x 10^8
d. 79 x 10^8 ANS b. correct
=7,917,000,000
*Students experimentally determine that the specific heat of copper is 0.410 J/g*C. If the known
value of the specific heat of copper is 0.385 J/g*C, what is the percent error?
a. 6.10%
b. 16.4%
,c. 6.49%
d. 15.4% ANS c- correct
percent error= (exp. - theoretical)/ theo x100%
(.410-.385)/.385 x100%= 6.49%
*Two balances in a classroom lab are used to determine the mass of an object. The actual mass of the
object is 15.374 grams. The triple beam balances are 15.38,39,37,38 whereas the digital balances are
15.375,376,376,375
Which of the following statements is true concerning the accuracy and precision of the two?
a. triple is both more accurate and precise
b. triple more accurate but digital more precise
c. digital more accurate but triple more precise
d. digital more precise and accurate ANS d. correct
accuracy= finding the differences between the measures and actual, the smaller the difference the
greater the accuracy .004-.016 vs .001-.002
precision= finding the difference between the highest and lowest reading, smaller difference means
greater precision .02 vs .001
Which of the following subskills best fits the process skill of observing?
a. Using the five senses to collect evidence and write descriptions
b. Grouping objects based in similarities, differences, and interrelationships
c. Explaining or interpreting collected evidence
d. Reporting to others what has been found by experimentation ANS a-correct
b-classifying
c-inferring
d-communication
Which of the following sets are equal?
a. 2,310mg and 2.310g
b. 2.310g and 231.0mg
, c. 2.310kg and 213.0g
d. 2.310fk and 231,00mg ANS a-correct
1g = 1,000mg
*Which of the foll0wing best describes the relationship of this data set?
points are going upwards (to the right) but not highly concentrated, all positives.
a. high positive correlation
b. low positive correlation
c. low negative correlation
d. no correlation ANS b-correct
rising does mean positive BUT since they are not concentrated in a straight line it is low positive
Which of the following is NOT true concerning correlation?
a. it can show the relationship between variables
b. it can show cause and effect
c. it can show linear relationships
d. it can show nonlinear relationships ANS b. correct
may be + or - or linear or nonlinear but does not determine cause and effect
Which of the following is NOT recommended storage practice for laboratory chemicals?
a. should be stored at the appropriate temp and humidity
b. should be dated when received and when opened
c. may be routinely stored on bench tops
d. should be stored on shelves with raised outer edges ANS c-correct
don't be dumb with chemicals....
Which of the following is the best prediction for the solubility at 150 degrees C?
a. 260g NaClO3 per 100g H20
b. 250g KNO3 per 100g H20
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