Answer:
f = 3.53×10⁵ s⁻¹
Explanation:
Given data:
Energy of photon = 2.34×10⁻²⁸ J
Frequency = ?
Solution:
h = 6.63 ×10⁻³⁴
Formula:
E = hf
2.34×10⁻²⁸ J = 6.63 ×10⁻³⁴ × f
f = 2.34×10⁻²⁸ J / 6.63 ×10⁻³⁴ Js
f = 0.353×10⁶ s⁻¹
f = 3.53×10⁵ s⁻¹
I'm a bit stupid, that's why I'm going to ask for help, can you be nice and help me? Thank you
Explanation:
ion
valence electrons
isotope
covalence
ionic
Tigers and crocodiles are more closely related than tigers and sharks. Which statement about shared characteristics best supports this statement?
Answer: Crocodiles and tigers both have four legs
Explanation: Even when sharks and tigers are both meat eaters, the question is about similarities between tigers and crocodiles, so D is out. A is about crocodiles and sharks, so it's out also. B suits for sharks too, so it's out too. C is the most suitable answer, because both animals have four legs, which means that they belong to the group of quadrupede animals.
Answer:
Crocodiles and tigers both have four legs
Explanation:
PLEASE HELPPP
A(n) _________is a
group of atom. joined by chemical bonds.
THIS IS SCIENCE NOT CHEMISTRY
Answer; molecule
Explanation:
Mention any three ways of making salt. (please help me Asap)
2. Mrs. Matthews went to Edisto beach with her husband and two children. She forgot the
sunscreen and the UV Index was extremely high at a level 10. Her whole family got very sunburnt.
Which energy transfer caused the sunburn?
(20 Points)
Radiation
Conduction
O Convection
Kinetic Energy
Answer:
A; radiation
Explanation:
also, please dont use brainly to copy and paste every answer to get them right, use it when u need help
A student is attempting to identify an unknown liquid. She places 10 mL of the liquid in a test tube and begins heating it over a burner. She checks and records the temp every minute until it begins to boil. What is the independent variable?
Answer:
The time of heating
Explanation:
Let us analyse the experiment closely; the temperature of the liquid increases as the time of heating increases. This implies that the temperature of the liquid is dependent on the time of heating of the liquid. The longer the time of heating, the greater the increase in temperature until the boiling temperature is eventually attained.
Hence, the temperature of the liquid is the dependent variable, the time of heating is the independent variable when the heating rate is held constant.
state the iupac name for CH₃(CH2)₃C(CH₃)₃
Answer:
CH3CH2COCl consists of three carbon atoms in the parent chain and chloroformyl group(-COCl). Therefore the name of the compound is Propanoyl chloride.
Help please! Tell me which one goes where.
Answer:
human-F
chicken-D
rabbit-E
tortoise-C
salamander-B
fish-A
Explanation:
hope this helped!!
I tried my best!!
please mark me as brainliest
HAVE A GREAT DAY <3
Answer:
D Tortoise
B Salamander
A Fish
C Chicken
F Human
E Rabbits
Explanation:
I Really have an Explanation
For the following problems, identify the substance as either an element, a compound, or a mixture. Write E for Element, C for compound, and M for mixture. 34. Silicon ___E__ 35. Salad dressing __M___ 36. Table Salt (NaCl) __C___ 37. Oatmeal with apples and raisins_____ 38. Lithium _____ 39. Copper Sulfate (CuSO4) _____
Answer:
Explanation:
34. E
35. M
36. C
37. M
38. E
39. C
Which is the molecular shape of water, H20, according to the VSEPR theory?
A. Bent
B. Tetrahedral
C. trigonal pyramidal
D. Trigonal planar
Answer:
the answer is A
Explanation:
What is one danger associated with the use of hydrogen gas
Answer:
Topping the list of concerns is hydrogen burns. In the presence of an oxidizer -- oxygen is a good one -- hydrogen can catch fire, sometimes explosively, and it burns more easily than gasoline does.
Answer:
hydrogen burns
hope it helps
WILL GIVE BRAINLIEST Pam and Caroline determined the mass and volume of a piece of metal to be 34.16 g and 11.3 mL respectively. Determine the density of the metal. (Please show work and use significant figures.
Answer:
0.303kg/m
Explanation:
Density=m/v where m is mass
and v is volume
we then convert m in grams to kg
= 34.16/1000
=0.0342kg
converting ml to m
=11.3/100
=0.113m
then density=0.0342/0.113
=0.303kg/m
Carl makes the table below to determine the number of atoms of each element in the chemical formula 4Ca(ClO3)2.
A table with 3 columns and 2 rows. The first column labeled element has entries calcium, chlorine, oxygen. The second column labeled calculation has entries 1 times 4 , 1 times 2, 3 times 2. The third column labeled total atoms has entries 4, 2, 6.
What mistake did Carl make?
Answer:
calcium chloride oxide
Answer:
He did not multiply the chlorine and oxygen atoms by the coefficient 4
Explanation:
I just took the quiz
i need help on these questions please!!!
the link for the vid will be in the comments
what is the chem formula for chromium (V) chloride?
Match the term with the definition.
Condensation
Evaporation
Sublimation
Freezing
A) A phase change from a gas to a liquid
B) A phase change from a solid to a gas
C) A phase change from a liquid to a gas
D) A phase change from a liquid to a solid
[Please Hellp!]
how would one convert 36 yd to centimeters?
Answer:
3291.84 cm
Explanation:
you would multiply the amount of yards you have by 91.44, since that's how many centimeters there are in 1 yd.
Answer: it’s D
Explanation:
Which characteristic is related to kinetic energy but not potential energy
Answer:
kinectic is movement and potential is still
Explanation:
While kinetic energy of an object is relative to the state of other objects in its environment, potential energy is completely independent of its environment. Hence the acceleration of an object is not evident in the movement of one object, where other objects in the same environment are also in motion.
Answer:an object’s speed
Explanation:
what are the similarities and differences between the crocodile , sheep , and gorilla digestive system?
Answer: Crocodile is a reptile whereas sheep and gorilla are the mammals.
Explanation:
Crocodile, sheep, and gorilla have alimentary canal in their digestive system. The urea is the common excretory waste.
Mouth is typically large in case of crocodile and comparatively small in sheep and gorilla.
In crocodile more sharp teeth are present as compared to sheep and gorilla for mastication of food and capturing the prey like fish or large animals like zebra.
The crocodile palate is more stronger than sheep and gorilla because it enable it to chew the bones of the prey.
BRAINLIEST! Please help me answer the following questions:
1) How do you find the valency of an element?
2) How do you determine if an element is nuetral/an isotope/ or an ion?
If you could help with 1 or both questions I would really appreciate it :)
Explanation:
1) from the periodic table for example if u looking for K it is from the group 1A so the valancey = +1 that is mean it loses one electron to reach a stable state. and this applied for the 1A , 2A, 3A groups.
if u looking for N it is from group 5A so its valency is -3
so it gain 3 electrons to reach a stable state to complete its orbital to 8 electrons. this applied to 5A, 6A,7A
for the transition metals and simimetals other rules.
2) neutral if the element does not hold any charge like
H2, O2, N2, Fe, Au, Cu ...
isotope : if the 2 elements have same symbol and atomic number but they differ in the mass number because the have different numbers of neutrons.
if the element is charged then it is considered as an ion ex: Fe2+ then it is iron cation ( +ion)
F- then it is fluoride anion (-ion)
if u have any doubt just writ a comment ( ;
The _____ law of thermodynamics states that when two objects of different temperature are in contact, heat energy will flow from the hotter to the cooler object.
Answer:
Second.
Explanation:
There are four types or kinds of the laws of thermodynamics, but in this question we are actually considering the second law of thermodynamics.
The second law of thermodynamics, in a simple sense means that energies can flow in an equilibrate manner. It can also be stated as the total entropy of the universe. The second law is normal refer to as Law concerning Entropy.
Thus, filling the gap in the Question above. Note that the word written in capital letters is the missing word.
"The SECOND law of thermodynamics states that when two objects of different temperature are in contact, heat energy will flow from the hotter to the cooler object."
Calculate the gravitational force between two objects when they are 0.75m apart each object has a mass of 5.00kg
Answer:
0.000000000666863
Explanation:
F = GMm/R²
What is Constituent Element?
Answer:
hope it helps...
Explanation:
a constituent element, material, etc.; component. a person who authorizes another to act in his or her behalf, as a voter in a district represented by an elected official. Grammar. an element considered as part of a construction. Compare immediate constituent, ultimate constituent.
If this helped please comment...
I WILL GIVE A LOT OF EXTRA POINTS. PLEASE ANSWER ALL OF THEM
75 for all
Explanation:
Answer:
Explanation: Li= Lithium, Na= Sodium, K= Pottasium, Rb= Rubdium Cs= Cesiuna, Fr= Fransium
6. Energy levels increases as if you move down a group during the number of electrons increases again.
7. A charge with higher and effective nuclear charge makes greater attractions to the electrons, pulling the electrons cloud closer to the nucleus makes it in a smaller atomic radius.
8. Ge= Germanium, He= Helium, O=Oxygen, Barium
Which of the following best defines a basic solution?
Which compound is
ionic?
Answer:
chemistry
Explanation: