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
Helen [10]
4 years ago
15

Why is it necessary to wait 10 minutes before adding iki solution to the test tubes?

Chemistry
1 answer:
Alenkasestr [34]4 years ago
3 0
The investigation was carried out to explore the effect of amylase on the starch that is present in a substance. The IKI solution reacts with starch to give a dark blue color.

We wait 10 minutes before adding the IKI solution to give the amylase sufficient time to act on the starch present, so that a false negative for the presence of starch is not obtained.
You might be interested in
Please number 12 and 13
nika2105 [10]
12.) 15 : 10 Times Each One By 0.3

15*0.3= 4.5
15-4.5 = 10.5

10*0.3= 3
10-3=7

The Scale Factor Is 10.5:7
6 0
3 years ago
7.
BlackZzzverrR [31]

Answer:

210 grams should be correct

Explanation:

hope this helps

4 0
3 years ago
Read 2 more answers
What is Saponification!?
Tom [10]

Answer:

<h3>Saponification is a process that involves conversion of fat, oil or lipid into soap and alcohol by the action of heat in the presence of aqueous alkali. Soaps are salts of fatty acids and fatty acids are monocarboxylic acids that have long carbon chains e.g. sodium palmitate.</h3>
8 0
4 years ago
How much hear must be obsorberd by 375.0 grams of water to raise its temperature from 10.0c to 35.0c? The specific heat capacity
inysia [295]

Answer:

The heat absorbed by water is 39243.75 J.

Explanation:

Given data:

Mass of water = 375.0 g

Heat absorbed by water= ?

Initial temperature = 10.0°C

Final temperature = 35.0 °C

The specific heat capacity of water = 4.186 j/g.°C

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1

ΔT = 35°C - 10°C

ΔT = 25°C

Q = m.c. ΔT

Q = 375.0 g× 4.186 j/g °C × 25°C

Q = 39243.75 J

The heat absorbed by water is 39243.75 J.

3 0
3 years ago
sodium combines with water to produce a sodium hydroxide and hydrogen gas. which word equation respresents this violent reaction
Crank

Answer:

Na(s) + H₂O (l) → NaOH(aq) + H₂(g).

Explanation:

answer is this thank you I hope it helps you pls like

3 0
3 years ago
Other questions:
  • 100 Points!!!!!!!!
    7·2 answers
  • The formula mass of a compound is the A) sum of the atomic masses of its atoms B) sum of the atomic numbers of its atoms C) prod
    9·1 answer
  • Hydrogen ions _____.
    10·1 answer
  • What other means of qualitative analysis are used to identify metals
    9·2 answers
  • What is the basic unit of all matter? A. Neutron B. Atom C. Electron D. Proton E. Nucleus
    5·2 answers
  • An exothermic reaction occurs spontaneously ,why?​
    15·1 answer
  • Which sentence describes a tropical rainforest ?
    5·1 answer
  • What is the coefficient of oxygen (O_2) in the balanced equation for the reaction written below?
    9·1 answer
  • Which is a more recent, more elaborate type of Japanese opera?
    13·2 answers
  • Which shows a correct association between a structure and one of its functions?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!