The statement "The total mass of materials is not affected by a chemical change in those materials" is called a(n) - ANS natural law
Which one of the following is a chemical change: - ANS Correct bread rising when baking
Filtration usually involves separating which phases from a mixture? - ANS so...
The statement "The total mass of materials is not affected by a chemical change in
those materials" is called a(n) - ANS natural law
Which one of the following is a chemical change: - ANS Correct bread rising when
baking
Filtration usually involves separating which phases from a mixture? - ANS solid from
liquid
Helium is an example of - ANS an element
True or false? Carbon dioxide can exist only in the gaseous state. - ANS False
The state of matter for an object that has neither definite shape nor definite volume is -
ANS gaseous
Which of the following properties cannot be used to distinguish between FeS and a
mixture of iron and sulfur? - ANS mass
All of the following are examples of chemical change EXCEPT - ANS Correct the
dissolving of sugar in water.
Which term best describes methane, CH4? - ANS Correct chemical compound
Use your calculator to solve the expression below and enter the signed decimal value
with two places to the right of the decimal point in the box.
(49.13-12.67) / (4.23 -1.54) - ANS Correct 13.55 ± 0.01
Express the result of the following calculation in scientific notation: 0.0263 cm2 ÷ 88.2
cm - ANS 2.98*10^-4cm
A cylinder has a radius of 2.38 mm and a height of 175 mm. Calculate the volume of the
cylinder in liters. (Volume = pi r2h) - ANS 3.11 *10^-3L
A linear function plot is shown below. The plot represents a function of the form Y = mX
+ b where m represents the slope of the plot line and b represents the intercept.
Determine m and b from the plot. If Y = 28.9, calculate the value of X and enter it in the
box with one digit to the right of the decimal point. - ANS Correct 51.80 ± 1%
Convert 34.59 cm3 to cubic inches (in3) given that 1 inch = 2.54 cm (exact). - ANS
2.111 in3
How many joules are there in 9.55 kcal? (1 calorie = 4.184 J) - ANS Correct 4.00 ´ 104 J
How many joules are equivalent to 450 calories? - ANS Correct 1.9 ´ 103 J
Use your calculator to solve the expression below and enter the signed decimal value
with two places to the right of the decimal point in the box. Please ignore significant
figure rules.
(6.851.3) - ANS Correct 12.2
A linear function plot is shown below. The plot represents a function of the form Y = mX
+ b where m represents the slope of the plot line and b represents the intercept.
Determine m and b from the plot. If X = 9.5, calculate the value of Y and enter it in the
box with one digit to the right of the decimal point. - ANS 16.0
A linear function plot is shown below. The plot represents a function of the form Y = mX
+ b where m represents the slope of the plot line and b represents the intercept.
Determine m and b from the plot. If X = 11, calculate the value of Y and enter it in the
box with one digit to the right of the decimal point. - ANS Correct 8.5
, UH Chem 1301 HW
The number 0.00246 expressed in exponential notation is - ANS 2.46 × 10-3
Convert 25.0 cm to inches (2.54 cm = 1 in). - ANS 9.84 in
Convert 7.09 kg to pounds (1 lb = 453.6 g). - ANS 15.6 lb
The fundamental unit of mass in the metric system is the - ANS kilogram
How many significant figures are in the measurement 0.2010 g? - ANS 4
How many significant figures are in the number 4.00700 × 1013? - ANS 6
Which of the following volumes are equivalent to 75 mL?
1. 0.75 cm3
2. 7.5 x 10-2 L
3. 0.0075 L - ANS 2 only
Convert: 18.2°C = ____________ °F. - ANS 64.8°F
A piece of an unknown metal weighs 238.8 g and occupies a volume of 72.2 mL. What
is the density of this metal? - ANS 3.31 g/mL
Copper has a density of 8.96 g/cm3. If a cylinder of copper weighing 31.01 g is dropped
into a graduated cylinder containing 20.00 mL of water, what will be the new water
level? - ANS 23.46 mL
The symbol for the element bromine is - ANS Br
Which of the following statements are true?
I. Models are always wrong unless they are proved by a theory.
II. Elements, such as lead, are made of tiny particles that mostly consist of open space.
III. The air you breathe is an example of a heterogeneous mixture.
IV. An isotope of silver-108 has 61 neutrons. - ANS II, IV
How many phosphorus atoms are represented by one formula unit of calcium
phosphate, Ca3(PO4)2? - ANS 2
Which atomic particle determines the chemical behavior of an atom? - ANS electron
How many neutrons are present in a 230-91 Pa nucleus? - ANS 139
An atom with 42 protons has a mass number of 98. The atom is - ANS Mo
Which of the following is not a metalloid? - ANS gallium
Which of the following is an alkaline earth metal? - ANS magnesium
What is the charge on an ion formed by an Sr atom? - ANS +2
What is the charge on an ion formed by an aluminum atom? - ANS Correct4. +3
Which of the following statements is not true of balancing a chemical equation? - ANS
Subscripts in the reactants must be conserved in the products.
Balance the following equation using the lowest possible integer coefficients and give
the coefficient of H2O
Ca3P2 + H2O => Ca(OH)2 + PH3 [Blank1] - ANS 6
When the following equations are balanced using the smallest possible integers, what is
the number in front of the underlined substance in each case?
Pb(s) + AgNO3(aq) → Pb(NO3)2 + Ag(s) - ANS 2
When the following equation is balanced using the smallest possible integers, what is
the coefficent of oxygen gas?
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