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
nika2105 [10]
3 years ago
10

True or false water and salt are examples of elements

Chemistry
2 answers:
Julli [10]3 years ago
6 0

Answer:

true jdjdhrohrjrhejdhrirhehejfhirhfjdudhdirje

Ludmilka [50]3 years ago
3 0
True lolololololololol
You might be interested in
CHEMISTRY MCQ HELP NEEDED, THANKS!
leonid [27]
D odours
Thats the answer please mark me as brainiest

7 0
3 years ago
Read 2 more answers
Someone help please I don’t know the answer to the question I meeed help
mihalych1998 [28]

Answer: 143.3  

137+115+104+263+98 divided by 5.Which gives us 143.3

5 0
3 years ago
An enzyme with molecular weight of 310 kDa undergoes a change in shape when the substrate binds. This change can be characterize
oee [108]

Answer:

(a) r = 6.26 * 10⁻⁷cm

(b) r₂ = 6.05 * 10⁻⁷cm

Explanation:

Using the sedimentation coefficient formula;

s =  M(1-Vρ) / Nf ; where s is sedimentation coefficient, M is molecular weight, V is specific volume of protein, p is density of the solvent, N is Avogadro number, f if frictional force = 6πnr, n is viscosity of the medium, r is radius of particle

s = M ( 1 - Vρ) / N*6πnr

making r sbjct of formula, r =  M (1 - Vρ) / N*6πnrs

Note: S = 10⁻¹³ sec, 1 KDalton = 1 *10³ g/mol, I cP = 0.01 g/cm/s

r = {(3.1 * 10⁵ g/mol)(1 - (0.732 cm³/g)(1 g/cm³)} / { (6.02 * 10²³)(6π)(0.01 g/cm/s)(11.7 * 10⁻¹³ sec)

r = 6.26 * 10⁻⁷cm

b. Using the formula r₂/r₁ = s₁/s₂

s₂ = 0.035 + 1s₁ = 1.035s₁

making r₂ subject of formula; r₂ = (s₁ * r₁) / s₂ = (s₁ * r₁) / 1.035s₁

r₂ = 6.3 * 10⁻⁷cm / 1.035

r₂ = 6.05 * 10⁻⁷cm

8 0
3 years ago
When we combine two simpler substances into a more complex one, it is known as a reaction.
Nata [24]

Answer:

It would be known as a chemical reaction or a chemical compound.

3 0
3 years ago
Which of the following is a chemical change?
FromTheMoon [43]

<u>Answer:</u>

<em>Silver tarnishing as the silver metal reacts with sulphur is a chemical change.</em>

<u>Explanation:</u>

Tarnishing is the process of chemical change occurring on the surface of objects leading to corrosion or other defects on the surface. The remaining options like dilution, eroding is a physical change where the concentration of salt and rock particles will be decreased, respectively.

Similarly for soil drying also the concentration of water will be decreased leading to a physical change from wetty or dry soil.

But the last option which indicates tarnishing of silver metal on reaction with sulphur is a chemical process as the surface of silver metal will be reacting to sulphur and leads to lose of electrons which leads to corrosion of the surface or tarnishing of silver.

4 0
3 years ago
Read 2 more answers
Other questions:
  • What is adaptive radiation?
    5·2 answers
  • Write two solubility rules that are used in this lab
    15·1 answer
  • The density of benzene at 15 ∘C∘C is 0.8787 g/mL. Calculate the mass of 0.1700 LL of benzene at this temperature. Express your a
    15·1 answer
  • the organ system that allows for movement of the organism as a whole and for internal movement of food through the digestive sys
    15·1 answer
  • In an exothermic reaction, the water will _______ in a calorimeter. A. release heat B. drop in temperature C. drop in volume D.
    6·2 answers
  • Foam cup A has 36 mL of water that contains 2 moles of HCl at 20 degrees Celsius. Foam cup B has 36 mL of water that contains 2
    6·2 answers
  • Can someone please name a project I can do for my science fair for 7th grade I need a easy one
    6·1 answer
  • How do you know that an acid based reaction is completely neutralized?
    5·1 answer
  • Please help with this question!
    5·1 answer
  • Iron metal can be obtained from iron ore, iron (III) oxide. When the iron (III) oxide is reacted with carbon monoxide gas it for
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!