Question

1. which property is independent of the amount of a substance?

a) mass
b) volume
c) density
d) weight

1. a metal block has a mass of 300 g and a volume of 75 cm³. what is its density?

a) 2 g/cm³
b) 3 g/cm³
c) 4 g/cm³
d) 5 g/cm³

1. which statement is true about weight and mass?

a) weight is constant everywhere
b) mass changes with location
c) weight depends on gravity, mass does not
d) mass depends on gravity

1. which of the following is an example of a base?

chart of ph scale
a) hcl
b) naoh
c) nacl
d) co₂

1. a solution has a ph of 3. what does this indicate?

a) high hydroxide ion concentration
b) neutral solution
c) high hydronium ion concentration
d) equal hydronium and hydroxide ions

1. how many elements are currently known?

a) 92
b) 100
c) 118
d) 150

1. which statement best describes particle motion in a gas?

image of particle arrangements
chart of phase changes
a) particles vibrate in fixed positions
b) particles slide past each other
c) particles move freely and rapidly in all directions
d) particles do not move

1. which state of matter has a definite volume but no definite shape?

a) solid
b) liquid
c) gas
d) plasma

Explanation:

Question 10

Intensive properties are independent of the amount of substance. Mass, volume, and weight depend on the amount (extensive), while density ($
ho = \frac{m}{V}$) is intensive, so it's independent of the amount.

Step1: Recall density formula

Density ($
ho$) is calculated as mass ($m$) divided by volume ($V$), so $
ho = \frac{m}{V}$.

Step2: Substitute values

Given $m = 300\ \text{g}$ and $V = 75\ \text{cm}^3$, substitute into the formula: $
ho = \frac{300\ \text{g}}{75\ \text{cm}^3}$.

Step3: Calculate

$\frac{300}{75} = 4\ \text{g/cm}^3$? Wait, no, $300\div75 = 4$? Wait, no, 754=300? Wait, 754=300, yes. Wait, but wait, the options: A) 2, B)3, C)4, D)5. Wait, 300/75=4? Wait, no, 754=300, so yes. Wait, but let me check again. 300 divided by 75: 754=300, so $
ho = 4\ \text{g/cm}^3$? Wait, but the option C is 4 g/cm³. Wait, but maybe I made a mistake? Wait, 300/75: 75*4=300, so yes. So the density is 4 g/cm³.

Mass is the amount of matter (constant regardless of location), weight is the force due to gravity ($W = mg$), so weight depends on gravity (location), mass does not. Option A: Weight varies with gravity (e.g., different on Earth vs Moon). Option B: Mass is constant. Option D: Mass is independent of gravity. So option C is correct.

Answer:

C) Density

Question 11