The table above shows data collected on five apples while doing field research outside the laboratory. what type of lab equipment was used to collect the data in the table?
a) microscope
b) thermometer
c) metric ruler
d) gram spring scale
apples / weight, in mass
apple 1 / 154 grams
apple 2 / 178 grams
apple 3 / 151 grams
apple 4 / 163 grams
apple 5 l 170 grams

D) gram spring scale

Explanation:

In this experiment, the property that was measured is mass, we know that because grams are units of mass.

The laboratory equipment that measures mass are scales.

A microscope allows you to see objects that are small, but it doesn't measure mass.

A thermometer measures temperature

A metric ruler measures length.

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol

what is the question?