1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
katrin [286]
3 years ago
6

Why is it suggested you use weighing paper or a watch glass instead of filter paper on which to allow a sample to dry? please gi

ve two examples?
Chemistry
1 answer:
snow_lady [41]3 years ago
5 0
The suggestion is to prevent a puddle of the liquid present in the sample from forming or from it leaking on to the surface on which it is placed. For example, if precipitates of a solid are removed from water and then placed on filter paper to dry, the water will soak into the filter paper and then leak on to the counter on which it is placed. If this precipitate were placed in a watch glass or weighing paper, the water would only evaporate and would not contaminate the sample. 
You might be interested in
Recovering the salt from a mixture of salt and water could best be accomplished?
Bumek [7]
Boiling the salt water

3 0
3 years ago
Read 2 more answers
Calculate the standard entropy of vaporization of ethanol at its boiling point, 352 K. The standard molar enthalpy of vaporizati
Korvikt [17]

Answer : The correct option is, (b) +115 J/mol.K

Explanation :

Formula used :

\Delta S=\frac{\Delta H_{vap}}{T_b}

where,

\Delta S = change in entropy

\Delta H_{vap} = change in enthalpy of vaporization = 40.5 kJ/mol

T_b = boiling point temperature = 352 K

Now put all the given values in the above formula, we get:

\Delta S=\frac{\Delta H_{vap}}{T_b}

\Delta S=\frac{40.5kJ/mol}{352K}

\Delta S=115J/mol.K

Therefore, the standard entropy of vaporization of ethanol at its boiling point is +115 J/mol.K

8 0
3 years ago
A 2.3 kg object has 15 ) of kinetic energy. Calculate its speed.
chubhunter [2.5K]

Answer:

<h3>The answer is option D</h3>

Explanation:

To find the speed given the kinetic energy and mass we use the formula

v =  \sqrt{ \frac{2KE}{m} }  \\

where

m is the mass

v is the speed

From the question

KE = 15 J

m = 2.3 kg

We have

v =  \sqrt{ \frac{2 \times 15}{2.3} }  =  \sqrt{ \frac{30}{2.3} }  \\  = 3.61157559...

We have the final answer as

<h3>3.6 m/s</h3>

Hope this helps you

7 0
3 years ago
Identify the oxidizing agent and the reducing agent for 4Li(s) + O_2 (g) to 2Li_2O(s).
wolverine [178]

Answer: Li is the reducing agentg and O is the oxidizing agent.

Explanation:

1) The oxidizing agent is the one that is reduced and the reducing agent is the one that is oxidized.

2) The given reaction is:

4Li(s) + O₂ (g) → 2 Li₂O(s)

3) Determine the oxidation states of each atom:

Li(s): oxidation state = 0 (since it is alone)

O₂ (g): oxidation state = 0 (since it is alone)

Li in Li₂O (s) +1

O in Li₂O -2

That because 2× (+1) - 2 = 0.

4) Determine the changes:

Li went from 0 to + 1, therefore it got oxidized and it is the reducing agent.

O went from 0 to - 2, therefore it got reduced and it is the oxidizing agent.

7 0
3 years ago
Read 2 more answers
Is the combustion of gasoline endothermic or exothermic?
UNO [17]
The reaction would be Exothermic
5 0
2 years ago
Other questions:
  • How many classes for a sample of households groceries?
    5·1 answer
  • Devante buys a helium birthday balloon for his mom at the grocery store, where the temperature is a comfortable 72oF. He takes t
    7·1 answer
  • Each axis on a graph should be:<br> equal<br> O numbered<br> Olabeled<br> vertical
    8·1 answer
  • Put the following in the correct chronological order from what happened first to what happened last.
    13·1 answer
  • Of the reactions below, only ________ is not spontaneous. Mg (s) 2HCl (aq) MgCl2 (aq) H2(g) 2Ag (s) 2HNO3 (aq) 2AgNO3 (aq) H2 (g
    9·2 answers
  • The formation of nitrogen dioxide and oxygen,
    10·1 answer
  • A teacher attaches two slinky springs to a fixed support. The springs are moved, as shown in the image. Wave A wave B What prope
    15·2 answers
  • Which of the following reactions will occur? question 10 options: ag hcl fe zn(no3)2 cu feso4 na hcl
    9·1 answer
  • At which instance contain 1 molecule of substances from following?
    6·1 answer
  • How to tell if a reaction is exothermic.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!