Answers
Answer:
The threshold frequency for a photosensitive metal is 3.3 x 1014 Hz. If light of frequency 8.2 x 1014 Hz is incident on this metal,
Explanation:8.2x1014Hz
Related Questions
Which arrow would most likely represent the phase change that occurs when silver is poured into a mold and cools to become a solid bar?
Answers
Answer:
5
Explanation:
took test edge 2020
D. 5
got it correct on test <3
Plz help!
It takes a car going 40 mph 3 seconds to come to a stop. What is the acceleration?
Answers
Answer:
6 second???
Explanation:
Im so sorry if thats wrong!!!!
what is magnesium? why does your body need it? how much do you need (per day)? What happens if you have too much or too little of it? Which foods do you find in it? What are some facts about magnesium?
Answers
Magnesium is a nutrient that the body needs to stay healthy. if you dont get enough magnesium in your body then you could get magnesium deficiency. Symptoms of magnesium deficiency include loss of appetite, nausea, vomiting, fatigue, and weakness. Extreme magnesium deficiency can cause numbness, tingling, muscle cramps, seizures, personality changes, and an abnormal heart rhythm. The RDA for magnesium is 310–420 mg for adults depending on age and gender. Sources of magnesium are greens, nuts, seeds, dry beans, whole grains and low-fat dairy products.
random facts:
A magnesium ion is present in the chlorophyll molecule of every living green plant.
Magnesium is critically important for the human metabolic system's functioning.
Which traits are polygenic? Select three options.
Answers
Answer:
is there an answier choice u have to choose from or no
Explanation:
Answer:
Hair color
Eye color
Birth weight
Explanation:
Would rust be considered a chemical or physical change? (I know the answer) Answer this first, and you will receive 20pts regardless, and will receive the "Most Brainiest." (I'm just testing you). I will correct any wrong answers. Any answer afterwards, will be for fun. :)
Answers
Answer:
pretty sure it's chemical
Answer:
Its a chemical
Explanation:
Which of the following is NOT an element? Nickel Potassium Carbon dioxide Aluminum
Answers
Answer:
carbon dioxide
Explanation:
carbon dioxide is a compound
Which action causes breakers?
Answers
Answer:
hope it helps..
Explanation:
The answer is when the waves meet the shore and cause the crest to spill over the trough. This activity creates a back and forth movement of the sand which causes them to settle at a certain area under below the water.
is titanium softer than gold i need this ASAPPPP
Answers
32.0 g SO2
Calculate the number of moles
Answers
500 moles
Explanation:
Given mass of SO2 = 32
Molar mass of SO2 =64
So, 32x10^8/64=500
Stoichiometry: Calculate the moles of H2 produced by .042 g Mg in the equation Mg + 2HCl > MgCl2 + H2
Answers
Answer:
Mg (s) + 2HCI2 (aq) → MgCI2 (aq) + H2 (g)
I think this is the correct answer I not a 100% sure if it is correct.
Explanation:
Guessing
Which of the following minerals scratches
fluorite mineral?
a. talc
b. diamond
c. gypsum
d. calcite
Answers
Answer:
b. diamond
Explanation:
Diamond is the hardest known naturally occurring substance. And it will scratch any other minerals below it on the moh's scale of hardness.
Fluorite is below diamond in the scale of hardness and it will readily scratch it. Talc, is the softest mineral, it will not scratch fluoriteBoth gypsum and calcite also below fluorite. They will not scratch this mineral.Pure water boils at 100°C.
What happens to the water particles when water boils?
A They gain energy and move further apart.
B They gain energy and stay close together.
CThey lose energy and move further apart.
DThey lose energy and stay close together.
choose one answer correctly!
Answers
The boiling of pure water has been resulted in the particles gaining energy and moving away from each other. Thus, option A is correct.
The boiling can be described as the conversion of the liquid state to the gaseous state. The molecules in the gaseous space are apart from each other and have no fixed shape.
The pure water has been transferred to the gaseous state at the temperature of 100 degrees celsius. The boiling has been introduced with the addition of the energy.
The water molecules gain energy and start to vibrate. The vibrations have resulted in the change in the change in phase of the liquid with evaporation.
Thus, when pure water boils, the water particles gain energy and move away from each other. Thus option A is correct.
For more information about boiling pure water, refer to the link:
https://brainly.com/question/11372663
ILL GIVE BRAINLIST IF YOU GET IT RIGHT Which of the following is an example of gravitational potential energy?
Question 9 options:
A battery powering a radio
A flag waving in the wind
A glass jar sitting on a shelf
A ball rolling along a sidewalk
Answers
If the shelf gets tipped the jar will slide off and convert to kinetic energy as gravity pulls it to land on the next level/floor
Which molecule contains only single covalent bonds?
A CL
B CO2
C CN2
D 02
Answers
CO2 i think if you understand so mark me as brainliest please.
Answer:
a
Explanation:
because that is a clorune that compose of a single covalent bonds
on platooooo
What does the law of conservation of energy state?
A.
Energy can be created from nothing.
B.
Energy cannot be destroyed.
C.
Energy cannot change forms.
D.
The total amount of energy in a system changes continuously.
Answers
Answer:
Your answer is B. Energy cannot be destroyed
Explanation:
The total amount of energy remains constant in an isolated system. It states that energy can neither be created nor destroyed, but it can change from one form to another.
Explanation: energy can’t be destroyed you can only store it
The given diagram shows the structure of an electrolytic cell.
Ella wants to construct an electrolytic cell using equipments found at home.
Give examples of materials (found at home )she can use for :
1. Anode (+Ve)
2. Cathode (-Ve)
3. Electrolyte ( Ella plans to use salty water. Will it work ? )
4. External Circuit (Battery) How powerful must it be
5.Bulb ( What kind ?)
Answers
Answer:
1. she requires the anode and cathode
3. the electrolyte : the increase amount of salty water she uses will determine the transfer in of electron needed to power the bulb
4. the battery she uses must be able to power a torch
5. the bulb could be a torch bulb or a bulb lesser than 25 watts
14. How do mushrooms create their
own microclimates?
Answers
Adenosine triphosphate is the:
A. energy molecule
B. mitochondria
C. cellular respiration
D. chloroplast
Answers
Answer:
A
Explanation:
It is the energy molecule.
how is the atomic radius calculated?
Answers
Explanation:
Divide the distance between the nuclei of the atoms by two if the bond is covalent
what is the amount of matter in an object.
A mass
B volume
C Density
Answers
Answer:
Option A
Explanation:
The answer is "mass" or option A. It's not option B because volume is the amount of space in a object which is not what the question is asking for. It's also not option C because density goes hand in hand with volume measuring how much space a object takes up, and also density is mass per volume. Leaving only option A, therefore it is your answer.
Hope this helps.
When the volume of the gas is 8L what is the pressure being exerted upon it?
Answers
Answer:
54
Explanation:
Please hurry I'm in a test!!!
Consider the following intermediate chemical equations.
2 equations. First: 2 upper N a (s) plus upper C l subscript 2 (g) right arrow 2 upper N a upper C l (s). Second: 2 upper N a subscript 2 upper O (s) right arrow 4 upper N a (s) plus upper O subscript 2 (g).
In the final chemical equation, NaCl and O subscript 2 are the products that are formed through the reaction between Na subscript 2 O and Cl subscript 2. Before you can add these intermediate chemical equations, you need to alter them by
A.) multiplying the second equation by 2.
B.) multiplying the first equation by 2.
C.) multiplying the first equation by (1/2).
D.) multiplying the second equation by (1/4).
Answers
Answer:
OMG Why has nobody answered this FREE 40 POINTS!!!!
For your ConVenIence Sir!
I shall provide thine with the answer, copied from other great sir.
B.) multiplying the first equation by 2.
Explanation:
Here is an image for Thine HappyNess!!!!!!!!!!!!! :D :D :D :D
Before adding the intermediate chemical equations to get the final products first we have to multiplying the first equation by 2.
What is the stoichiometry?Stoiciometry of any chemical reaction gives idea about the amount of species present before and after the completion of the reaction.
Given first intermediate chemical equation is:
2Na(s) + Cl₂ → 2NaCl(s)
Second intermediate chemical equation is:
2Na₂O(s) → 4Na(s) + O₂(g)
Final products of the given chemical reactions are NaCl and O₂ which are formed by the below given balanced chemical reaction:
2Na₂O + Cl₂ → 4NaCl + O₂
To get the desire balance chemical equation before adding the given intermediate equation, first we have to multiply the first equation by 2.
Hence option (B) is correct.
To know more about stoichiometry, visit the below link:
https://brainly.com/question/16060199
Which statement best describes a source of new genetic variations in a species? A. Asexual reproduction produces many offspring with a successful set of genes.
B. Sexual reproduction results in offspring that each have a unique set of genes.
C. Lifelong leaming helps offspring with the same parents have different skills.
D. Limited resources cause some offspring to survive longer than others,
Answers
Answer:
B. Sexual reproduction results in offspring that each have a unique set of genes.
Explanation:
New genetic variation arises in a species as a result of sexual reproduction which results in offspring having a unique set of genes.
Genetic variation is the differences in the genetic make up of organisms within a population. During sexual reproduction, there is an exchange of materials between sexes and the new combination produces a varied form of the original genetic materials. The main source of genetic variation is mutation.Answer:
B
Explanation:
What does the size of the atom & their electron structure (called electron configuration) determine?
Answers
Answer:
In atomic physics and quantum chemistry, the electron configuration is the arrangement of electrons in an atom, molecule, or other physical structure (e.g., a crystal). ... The concept is also useful for describing the chemical bonds that hold atoms together.
Explanation:
hope this helps :)
You pull a sled with a package on t across a snow-covered fiat lawn. If you
apply a force of 46.8N to the sled, I accelerates at 0.75 m/s2 What is the
combined mass of the package and the sied? (Assume there is no friction
Answers
Answer:
Explanation:
Answer:
62.40kg
Explanation:
Recall that atoms gain or lose electrons to become ions. So, an ion has a different number of electrons than its corresponding neutral atom. Positive ions have lost electrons, and negative ions have gained electrons. The table includes the electron configuration of several ions. Complete the rows for magnesium and oxygen (oxide) ions by identifying the correct ion charge, electron configuration, and neutral atom with the same configuration as the ion. You may need to use online resources or the periodic table to determine the correct ion charges. Select the correct answer from each drop-down menu to complete the table.
Answers
Answer:
2+/1s2 2s2 2p6/neon
2−/1s2 2s2 2p6/neon
Explanation:
Explanation:
A magnesium atom that loses two electrons to become a magnesium cation has the same electron configuration as neon. An oxygen atom that gains two electrons to become an oxygen anion also has the same electron configuration as neon.
Ion Ion Charge Electron ConfiguratIon Neutral Atom with Similar
Electron ConfiguratIon
sodium 1+ 1s2 2s2 2p6 neon
magnesium 2+ 1s2 2s2 2p6 neon
aluminum 3+ 1s2 2s2 2p6 neon
potassium 1+ 1s2 2s2 2p6 3s2 3p6 argon
calcium 2+ 1s2 2s2 2p6 3s2 3p6 argon
nitrogen (nitride) 3− 1s2 2s2 2p6 neon
oxygen (oxide) 2− 1s2 2s2 2p6 neon
fluorine (fluoride) 1− 1s2 2s2 2p6 neon
sulfur (sulfide) 2− 1s2 2s2 2p6 3s2 3p6 argon
chlorine (chloride) 1− 1s2 2s2 2p6 3s2 3p6 argon
Answer:
Below
Explanation:
Second image
According to the picture above, which layer contains :
Answers
Answer:
a) layer 4
b) layer 1
Explanation:
Older the layer=older the fossils
Newer the layer=newer the fossilss
PLS HELP ASAP!!!!!! WILL GIVE BRAINLIEST!!!!!!!!!!
Write a summary paragraph for each part discussing this experiment and the results. Use the following questions and topics to help guide the content of your paragraph. Part 1 What was your hypothesis? According to your data, do you think your hypothesis was correct? (Be sure to refer to your data when answering this question.) Summarize any difficulties or problems you had in performing the experiment that might have affected the results. Describe how you might change the procedure to avoid these problems. Be sure to submit your data along with your paragraph. Part 2 What effect did the temperature have on the viscosity of the honey? (Be sure to refer to your data when answering this question.) Give at least two practical examples where knowledge of viscosity is important.
Answers
Answer:
Explanation:
Dang which subject is this history or science
What would the name be for Lead (Pb) and Phosphorus (P) bonded together?
Answers
Answer:
Lead Phosphate
Explanation:
What mass of sodium hydroxide is needed to make 0.500 L of 2.50 M NaOH ?
Answers
Answer:
50 g NaOH
General Formulas and Concepts:
Chemistry - Solutions
Reading a Periodic TableUsing Dimensional AnalysisMolarity = moles of solute / liters of solutionExplanation:
Step 1: Define
0.500 L
2.50 M NaOH
x moles of solute
Step 2: Define conversions
Molar Mass of Na - 22.99 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of NaOH - 22.99 + 16.00 + 1.01 = 40 g/mol
Step 3: Find moles of solute
2.50 M NaOH = x moles NaOH / 0.500 L
x = 1.25 moles NaOH
Step 4: Convert
[tex]1.25 \ mol \ NaOH(\frac{40 \ g \ NaOH}{1 \ mol \ NaOH} )[/tex] = 50 g NaOH
Step 5: Check
We are given 3 sig figs. Since our final answer has 2 sigs, there is no need to round.