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
crimeas [40]
3 years ago
12

Which of the following is an example of a physical change?

Chemistry
2 answers:
dangina [55]3 years ago
5 0
D it is only physical and not chemical
mars1129 [50]3 years ago
4 0

Answer:

D

Explanation:

Because a physical change is affecting the form of a chemical substance, not its chemical composition.

You might be interested in
Which is a characteristic of all ions?
Brut [27]

Answer:

I guess B They have a charge

7 0
3 years ago
What is your dream job or ideal lifestyle?
blondinia [14]
My dream job is to create my own business and become my own boss
7 0
3 years ago
Propanoic acid, ch3ch2cooh, has a pka =4.9. draw the structure of the conjugate base of propanoic acid and give the ph above whi
xenn [34]

Conjugate base of Propanoic acid (CH_{3}CH_{2}COOH is propanoate where -COOH group gets converted to -COO^{1-}. The structure of conjugate base of Propanoic acid is shown in the diagram.

The p^{H} above which 90% of the compound will be in this conjugate base form can be determined using Henderson's equation as propanoic acid is weak acid and it can form buffer solution on reaction with strong base.

p^{H}= p^{k_{a}+ log\frac{[Conjugate base]}{[acid]}=4.9+log\frac{90}{10}=5.85

As 90% conjugate base is present, so propanoic acid present 10%.

8 0
3 years ago
Complete the sentences about heme. Some terms will not be used. The prosthetic group of hemoglobin and myoglobin is . The organi
nevsk [136]

Explanation:

Haemoglobin consists of heme unit which is comprised of an <u>Fe^{2+}</u> and porphyrin ring. The ring has four pyrrole molecules which are linked to the iron ion. In oxyhaemoglobin, the iron has coordinates with four nitrogen atoms and one to the F8 histidine residue and the sixth one to the oxygen. In deoxyhaemoglobin, the ion is displaced out of the ring by 0.4 Å.

The prosthetic group of hemoglobin and myoglobin is - <u>Heme</u>

The organic ring component of heme is - <u>Porphyrin</u>

Under normal conditions, the central atom of heme is - <u>Fe^{2+}</u>

In <u>deoxyhemoglobin</u> , the central iron atom is displaced 0.4 Å out of the plane of the porphyrin ring system.

The central atom has <u>six</u> bonds: <u>four</u> to nitrogen atoms in the porphyrin, one to a <u>histidine</u> residue, and one to oxygen.

7 0
3 years ago
A sample of iron absorbs 67.5 j of heat upon which the temperature of the sample increases from 21.5 °c to 28.5 °c. if the speci
asambeis [7]
Q = mcΔθ

67.5 = m x 0.45 x (28.5 - 21.5)

M = 67.5 / 3.15
= 21.4 g
3 0
3 years ago
Read 2 more answers
Other questions:
  • How can you identify a chloride from an iodide solution using the silver nitrate and sodium thiosulfate test?
    7·1 answer
  • Which is the correct order of material in terms of reflectivity from least to greatest
    10·1 answer
  • Which indicator of a chemical change is shown?
    14·2 answers
  • The cis and trans geometric isomers of a compound have different chemical and physical properties. Draw the structure of the geo
    7·1 answer
  • The great French chemist Antoine Lavoisier discovered the Law of Conservation of Mass in part by doing a famous experiment in 17
    9·1 answer
  • PLS HELP ME IT IS SUPPOSED TO BE DONE IN 10 MINS PLS In a two paragraph (it can be a 2 sentence paragraph) extended response, su
    5·1 answer
  • Gravity increases when:
    7·1 answer
  • What happen when the nitrate of an alkali metal is heatad?<br>​
    9·2 answers
  • Equation for the reaction btn nitric acid and metal X whose valence is 3​
    15·1 answer
  • Which of the following best explain why argon, which is a noble gas, does not react with other elements. Noble gases ________. A
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!