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kirza4 [7]
4 years ago
14

Ann propped up a graham cracker in a shallow bowl. She then set up an electric fan to blow on the graham cracker at three differ

ent speeds. what is anns dependent variable in this experiment?
Chemistry
2 answers:
neonofarm [45]4 years ago
6 0
The dependent variable is the graham cracker.
Citrus2011 [14]4 years ago
6 0

Answer: Graham cracker

Explanation:

An independent variable can be changed, altered and manipulated in an experiment to determine the effect of this on the dependent variable. The dependent variable or experimental variable undergoes changes due to the effective changes in the independent variable.

In the given situation, the electric fan three different speeds is the independent variable whose effect is to be determined on the graham cracker, which is a dependent variable.  

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The ΔHvap of a certain compound is 47.45 kJ·mol−1 and its ΔSvap is 59.15 J·mol−1·K−1. What is the boiling point of this compound
podryga [215]

Answer:

802.2 K

Explanation:

To solve this problem we can use the formula:

  • Tb = ΔHvap / ΔSvap

Where Tb is the boiling point (in K).

We already know the values of both ΔHvap and ΔSvap, so we calculate Tb:

  • ΔHvap = 47.45 kJ·mol⁻¹ = 47.45x10³J·mol⁻¹

Tb = 47.45x10³J·mol⁻¹/59.15 J·mol⁻¹·K⁻¹

  • Tb = 802.2 K

So the boiling point of the compound is 802.2 K (or 529 °C)

7 0
3 years ago
Number is equal to 6022 x 10^23
Juliette [100K]

Answer:

The Avogadro's number

Explanation:

the number is 6.02214x10 to the 23 power

8 0
3 years ago
Which technique can be used to remove air bubbles from a syringe? a) Hold the syringe downward, shake vigorously for 10 seconds,
swat32

hold the syringe downward,shake vigorously for sometime,and expel the bubbles through the needle using the syringe plunger. hold the syringe upright, provide a firm tap or flick to the barrel

3 0
2 years ago
Name:
EleoNora [17]

Answer:

Explanation:

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6 0
3 years ago
An antacid tablet was dissolved in water and 10mL of 0.16M HCl was added. After the acid had reacted with the tablet it required
Mnenie [13.5K]

Answer:

0.0008 mole of HCl

Explanation:

From the balanced equation between HCl and NaOH:

HCl + NaOH --> NaCl + H_2O

1 mole of acid requires 1 mole of base for neutralization.

mole = molarity x volume

mole of NaOH = 0.02 x 0.04 = 0.0008 mole

mole HCl = 0.16 x 0.01 = 0.0016 mole

Since 1 mole of NaOH requires 1 mole of HCl for neutralization, it means that 0.0008 mole of NaOH will require 0.0008 mole of HCl. The remaining mole of HCl must have been neutralized by the antiacid:

0.0016 - 0.0008 = 0.0008 mole.

Therefore, 0.0008 mole of HCl must have been neutralized by the antiacid.

7 0
4 years ago
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