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
erma4kov [3.2K]
2 years ago
7

This leaf is green is A. an observation, B. a hypothesis. C. a theory As Corporation. All Rights Reseruar​

Chemistry
1 answer:
Trava [24]2 years ago
7 0

Answer:

A. an observation

Explanation:

Because by saying that the leaf is green that is an observation on the leaf to tell what color it is.

Have a nice day/night :)

You might be interested in
42. Proton and electuron.
Sauron [17]

Answer:

Protons:

- positive

- aka cation

- in the nucleus along with the neutrons

Electrons:

- negative

- aka anion

- situated in the orbital shells/configuration levels (there are many names)

7 0
2 years ago
When coal burns, the reaction
katovenus [111]
Answer is B. Releases heat and is exothermic
4 0
2 years ago
8. A party-supply store sells a helium-gas
MatroZZZ [7]

Answer:

P₂= 116.7 atm

Explanation:

Here apply the Boyle's law equations that states :at constant temperature the volume of a dry mass of a gas is inversely proportional to its pressure.

This is simplified as;

P₁V₁=P₂V₂ where P is pressure and V is volume

Given that;

P₁=1

V₁=1.81 m³

P₂=?

V₂=1.55*10^-2 m³

Apply the formula

1*1.81 =P₂*1.55*10^-2 m³

1.81/1.55*10^-2  =P₂

P₂= 116.7 atm

7 0
3 years ago
A substance floats or sinks in another because of its relative
mart [117]
A substance floats or sinks in another because of its relative density. Take ice floating in water for example. Water is more dense than ice so ice floats.

Mass is incorrect as the buoyancy or ability of an object to float depends on the mass per volume, which is equivalent to density.
6 0
3 years ago
The bonds of oxygen molecules are broken by sunlight. The minimum energy required to break the oxygen-oxygen bond is 495 kJ/mol
olga_2 [115]

Answer:

The wavelength of sunlight is required to break the bond in one oxygen molecule is 242 nm.

Explanation:

Energy required to break the 1 mol oxygen-oxygen bond:

=495 kJ=495000J

1 mol = 6.022\times 10^{23} molecules

Energy required to break 1 molecule of oxygen molecule= E

= E=\frac{495000 J}{6.022\times 10^{23}}=8.219\times 10^{-19} J

The energy required to break the  1 molecule of oxygen is equal to enrgy of one photon of a sunlight.

E=\frac{h\times c}{\lambda}

where,

\lambda = wavelength of the light

E = energy of the photon

h = Planck's constant = 6.63\times 10^{-34}Js

c = speed of light = 3\times 10^8m/s

\lambda=\frac{h\times c}{E}

\lambda =\frac{6.63\times 10^{-34}Js \times 3\times 10^8m/s}{8.219\times 10^{-19} J}=2.42\times 10^{-7} m=242 nm

The wavelength of sunlight is required to break the bond in one oxygen molecule is 242 nm.

4 0
3 years ago
Other questions:
  • Water that is returned to the environment after secondary treatment is known as
    13·2 answers
  • Which aldehyde is an intermediate in the reduction of ethyl benzoate with lithium aluminum hydride?
    10·1 answer
  • How many protons does an atom of Iodine (I), #53, have if it has an atomic mass of 127?
    7·1 answer
  • A base is a substance that accepts protons. true or false?
    8·2 answers
  • A gas that exerts a pressure of 2.15 atm in a container with a volume of 0.0900 L will exert a pressure of ___ atm when transfer
    15·1 answer
  • View Lab
    10·2 answers
  • I need help I'll mark you as Brainliest ​
    8·1 answer
  • Imagine that you helped to discover a new element; A=302;Z=119. How many protons, electrons, and neutrons are in each atom it th
    6·1 answer
  • Si un átomo gana electrones se convierte en un.?
    7·1 answer
  • What is the best definition of the enthalpy change Hr
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!