Answer:
3.99 × 10 ^-28
Explanation:
In the equation of E = hc/λ, the h = 6.626 × 10^−34 J and c = 3 × 10^8 m/s
E = 6.626 × 10^−34 × 3 × 10^8 divided by 498
E = 3.99 × 10 ^-28
i need help with this
Answer:
1. The graph is showing the monthly rainfall between April to July.
2. The month is on the X axis.
3. The inches of the monthly rainfall is on the Y axis.
Adding the number of protons to the number of neutrons determines what about the atom?
A
the atomic number
B
the atomic mass
(Hint: protons + neutrons = ?)
Drag the appropriate answer to the correct location on the concept map below.
WHATS H2O??????????????
Answer:
Explanation:
water
H. 2. O is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms
which elements are liquid in the periodic table?
MAY SOMEONE HELP ME PLZZ
A tire company wants to determine what kind of rubber will last the longest for their tires. What are some variables that the researchers will want to make controlled variables?
Answer: Rubber source, temperature, thinkness, thread design, driving pattenrs, weather, etc.
Explanation: There are many variables. Here are a few I would include in a tire lifetime study:
1. Type of rubber, including source
2. Thickness of tire
3. Design of tire thread
4. Life as a function of average speed and road surface
5. Expected outside temperature and wet conditions
6. Driving conditions of speed and both acceleration and deceleration parameters (e.g., tire life when slamming on the brakes or accelerating quickly)
Is it correct or wrong
Answer:
i think correct
Explanation:
i am not sure but i hope it will help you
How are elements arranged on the periodic table?
a. they are arranged to highlight similarities between elements
b. they are arranged to highlight different elements with similar isotopes
c. they are arranged in order from most abundant to very rare and unstable
d. they are arranged in order of the date of discovery
Answer:
the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom.In a periodic table arranged in order of increasing atomic number, elements having similar chemical properties naturally line up in the same column.
The elements on the periodic table are arranged on the basis of highlighting similarities between elements. Thus, the correct option for this question is A.
How elements are arranged on the periodic table?The elements on the periodic table are basically arranged on the basis of increasing their atomic number. These atomic number is represented by the number of protons in the nucleus of an element.
According to the question, the elements possessing identical chemical properties are arranged in the same group. For example, group 17 is known as the halogen group. Among this group, the elements bear one electron short to fulfill their octet.
The whole periodic table comprises of 18 groups and 7 periods.
Therefore, the elements on the periodic table are arranged on the basis of highlighting similarities between elements. Thus, the correct option for this question is A.
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1 Write the correct symbol, with both superscript and subscript,
for each of the following. Use the list of elements in the front
inside cover as needed: (a) the isotope of platinum that contains
118 neutrons, (b) the isotope of krypton with mass number 84,
(c) the isotope of arsenic with mass number 75, (d) the isotope of
magnesium that has an equal number of protons and neutrons.
Answer:
+27 66 514 3800
Explanation:
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Tyrone and Valerie wanted to determine what feature of a paper airplane would cause it to fly the farthest. Tyrone made his airplane with longer wings than Valerie's airplane. Valerie's airplane had shorter wings than Tyrone's. After testing the two airplanes several times, the data shows that wider wings help airplanes fly farther than shorter wings.
Which characteristic of science is missing from this experiment?
The question is not testable because paper airplanes are always changing.
The phenomenon is not observable because air resistance changes.
The experiment is not replicable because controlled variables are not included.
The results are not reliable because the airplanes were only tested one time.
The characteristic of science that is missing from this experiment is that "the results are not reliable because the airplanes were only tested one time".
Some of the characteristics of science include objectivity, verifiability , reliability, accuracy, observable, precision etc.
Based on the question asked, the results of the experiment are not reliable due to the fact that the the airplanes were only tested one time. The airplanes should have been tested multiple times to show that they are reliable.
In conclusion, the correct option is D.
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Answer:
D
Explanation:
The density of a substance is 1.63 grams per milliliter. What is the mass of 0.25 liters of the substance in grams?
Answer:
407.5 g
Explanation:
Hope it helps.
Iron is a type of metal that has a shiny surface. However, iron can rust easily. Explain
Answer:
Iron, as well as iron alloys, rusts because of a chemical reaction known as oxidation. When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide. ... Both oxygen and moisture are catalysts for rusting.
Answer:
Iron rusts because of of a chemical reaction known as oxidation. During the chemical reaction iron is converted to iron oxide, if it is left unaddressed, the iron oxide will spread, thereby jeopardizing the physical integrity of the iron.
How do double replacement reactions relate to Combustion reactions
Explanation:
A single-replacement reaction replaces one element for another in a compound.
A double-replacement reaction exchanges the cations (or the anions) of two ionic compounds.
A precipitation reaction is a double-replacement reaction in which one product is a solid precipitate.
Solubility rules are used to predict whether some double-replacement reactions will occur.
Write the symbol of atoms as per John Dalton.
please tell fast
Answer:
In his 1805 work, "A New System of Chemical Philosophy," Dalton propounded the tenets of his atomic theory: The chemical elements are made of atoms. The atoms of an element are identical in mass. Atoms of different elements have different masses.
Hope it helps.... If yes mark me as brilliants
What is the process in which matter changes from the liquid to the solid state?
A. melting
B. freezing
C. boiling
D. vaporizing
Answer:
freezing
Explanation:
hope it is helpful
Answer:
freezing. b.
Explanation:
How long does S waves travel through earths crust
Answer:
For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.
IF HELPED MARK AS BRAINLIEST
Answer:
For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.
20 point for right answer
Answer:The below file contains the answer
Explanation:
Water and carbon dioxide being converted to glucose
a
Chemical Change
b
Physical Change
Answer:
Chemical change
Explanation:
1. The compound 2NaCl consists of A.2 atoms of sodium element B. 1 atom of
chlorine element C. 3 atoms of sodium element D. 1 atom of sodium element
2. The valency of iron in iron (III) sulphate is A.3 B.2
C.4
D.5
3.The systematic name of the compound Cuso, is A. Copper (I) sulphate B.Copper
(II) tetraoxosulphate C.Copper (II) tetraoxosulphate (IV) D.Copper (II)
tetraoxosulphate (VI)
Answer:
1. The compound 2NaCl consists of:
» B. 1 atom of chlorine element.
» D. 1 atom of sodium element.
2. The valency of iron in iron (III) sulphate is:
» A. 3 [ valency of only iron ]
» B. 2 [ valency of only sulphate ion ]
3.The systematic name of the compound CuSO4:
» B. Copper (II) sulphate
Explanation:
[tex].[/tex]
Answer:
1) A.
2) A.
3) A.
i really need help please
Answer: its blank???
Explanation:
2. All organisms obtain and use
In order to live.
Answer:
Energy . ......
Hope this helps you!
Earth and Jupiter are shown next to each other. Earth is much smaller than Jupiter.
Why is Jupiter so much larger than Earth? Check all that apply.
Inner planets were created at higher velocities.
Outer planets have less gravity than inner ones.
Outer planets attracted helium, hydrogen, and other gasses.
Inner planets formed where temperatures were cooler.
Gases escaped from inner planets and not from outer ones.
Answer:
A, C, and E. I hope you have a good day.
Explanation:
Answer:
1, 3, and 5
Explanation:
A catalyst that has a different phase than the reactants is a(n) _______. A. exergonic catalyst B. endergonic catalyst C. homogeneous catalyst D. heterogeneous catalyst E. autocatalyst
Answer: Heterogeneous Catalyst
Explanation: The word heterogeneous means "different phases" or insoluble in science.
Help me,I’m so confused ..and explain pls
Answer:
1. is 50...
75/1.5 = 50
2. is 600...
300/5 is 600
3.
Part A: 45 minutes= 0.75 hours
Part B: 5.3
Explanation:
Don't agree? The calculator says other wise....
i checked it its correct.
Use you observation to determine which polymorph is in the customer’s returned chocolate sample.
Answer:
Cocoa butter, the fat in chocolate, can crystallize in any one of 6 different forms (polymorphs, as they are called). Unfortunately, only one of these, the beta crystal (or Form V), hardens into the firm, shiny chocolate that cooks want. Form VI is also a stable hard crystal, but only small amounts of it form from the good beta (Form V) crystals upon lengthy standing. When you buy commercial chocolate it is in the form of beta crystals.
When you melt chocolate and get it above 94° F, you melt these much desired beta crystals and other types of crystals can set up. If you simply let melted chocolate cool, it will set up in a dull, soft, splotchy, disgusting-looking form. Even the taste is different. Fine chocolate has a snap when you break it and a totally different mouthfeel from the other cocoa butter forms.
Answer:
When you melt chocolate and get it above 94° F, you melt these much desired beta crystals and other types of crystals can set up. If you simply let melted chocolate cool, it will set up in a dull, soft, splotchy, disgusting-looking form. Even the taste is different. Fine chocolate has a snap when you break it and a totally different mouthfeel from the other cocoa butter forms.
Explanation:
hope it's help you......!!!!!!!
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1. Is the reaction between magnesium and oxygen in the air spontaneous?
Answer:
Once ignited, a ribbon of magnesium metal burns freely in air to form solid magnesium oxide in the form of a white powder. The reaction is plainly spontaneous even though ΔS is negative.
Give reasons. mass is called a physical quantity.
Answer:
Mass is a Physical quantity
Explanation:
It is a fundamental physical quantity because it cannot be derived from other physical quantities.
.
.
.
Hope it helps
2. What evidence is there that green ink is a mixture?
Answer:
The fact that the green ink separated from the rubbing alcohol proves that it is indeed a mixture.
Calculate the no. of moles in 25gm of calcium phosphate
Plz Fast Urgent
Answer:
0.162 mol
Explanation:
n=m/M
M= 20*3 + 15*2 + 8*4*2
M=154 g/mol
n=25g/154g/mol
n=0.162 mol
The number of moles in 25 grams of calcium phosphate is 0.162 mol.
What are moles?Mole is a SI unit that is used to measure the quantity of any substance in a specific amount. To calculate the moles, we will divide the mass of the substance by the molar mass of that substance.
n = m/M
Calcium phosphate is a chemical compound that contains calcium and phosphorus or phosphoric acid, and it is used to treat the low calcium in the body and thyroid and parathyroid.
The molar mass of calcium sulfate is 154 g/mol
The mass of calcium sulfate is 25 grams
Putting the value in the equation
n = m/M
n = 25g / 154 g/mol = 0.162 mol
Thus, the moles of calcium sulfate are 0.162 mol.
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calculate the mass of iron (iii) carbonate that will be formed when 15.0 mL of 0.15 M iron (iii) chloride solution are reacted with 20.0 mL of 0.15 M sodium carbonate. Be sure to write the balanced metathesis reaction that is occuring.
Answer:
The molar mass of a substance is calculated as the mass of a given chemical compound or substance, which is then divided by the amount of the substance. The mass is calculated in grams and the amount of the substance is calculated in mol. Thus, the standard unit for molar mass is g/mol.
Explanation:
According to the given question, the reaction between iron chloride and sodium carbonate will be given as:
[tex]\text {3Na_{2}CO_{3}\text} \;\[+\] \;\text{ 2FeCl_{3} \text}\; \rightarrow\; \text {6NaCl}\; \[+\] \;\text { Fe_{2} (CO_3)_{3} \text}[/tex]
Now, to calculate the mass of iron carbonate formed in the above chemical reaction, it will be given as:
[tex]{ \text Moles\;of}\text \;\text {FeCl_{3} \text} \[=\dfrac{0.15 \;\text {moles} \times 0.015\; \text L}{1.0 { \;\text L}\text}[/tex]
[tex]=\;0.00225\; \text {moles}\text[/tex]
Similarly, for sodium carbonate
[tex]\text Moles\; of\; Na_{2}CO_{3}}\te \[=\]\dfrac{0.15 \;\text {moles} \times 0.020\; \text L}{1.0 { \;\text L}\text}\\[/tex]
[tex]\[=\]\;0.0003\; {\text moles \text}[/tex]
Limiting reactant is [tex]\text {FeCl_{3} \text}[/tex]
Now, calculating iron chloride mass:
[tex]=\dfrac{0.00225 \times 1\;\text{moles}\;\text{Fe}_2 {(\text{CO}_3)}}{2\;\rm{moles\;of\;}Fecl_3}[/tex]
[tex]=0.001125 \;\text {moles }[/tex]
Now, molar mass of the [tex]\text{Fe}_{2}\text{CO}_{3}[/tex] will be [tex]=291.71679\;\text{g/ mol}[/tex]
[tex]\begin{aligned}\text{Mass}&=\frac{\text{Moles}}{\text{Molar mass}}\\\\&=\frac{0.001125\;\text{moles}}{291.71679\; \text{g/mol}} \\\\&=3.85648\times10^{-6} \end{aligned}[/tex]