Answer:
B. The reaction rate decreases
Explanation:
I just took the pre test and got a 100
PLS HELPP!!!
i’ll mark brainliest + 15 points!!
If 2.5 grams of calcium bromide reacted with excess lithium oxide, how many grams of bromide product would be formed?
8. How many milligrams of iron are delivered from a 250. mg tablet of FeSO4.7H20
Answer:
[tex]molar \: mass \: of \: FeSO _{4}.7H _{2}0 = (56 + 32 + (16 \times 4) + (7 \times 18)) \\ = 278 \: g \\ \\ (278 \times 1000) \: mg \: of \: FeSO _{4}.7H _{2}0 \: contains \: (56 \times 1000) \: mg \: of \: Fe \\ 250 \: mg \: of \: FeSO _{4}.7H _{2}0 \: contain \: ( \frac{250 \times 56 \times 1000}{278 \times 1000} ) \\ = 50.35 \: mg \: of \: Fe[/tex]
The mass of Fe delivered by 250 mg Iron sulfate heptahydrate has been 50.35 mg.
The molar mass of the compound has been the sum of the mass of each element present in the compound. The given compound is iron sulfate heptahydrate. The compound has molar mass 278 grams.
1 mole of compound has been consisting of 1mole of iron.
278 grams Iron sulfate = 56 grams Fe
278,000 mg Iron sulfate = 56,000 mg Fe.
The mass of iron in 250 mg compound can be given as:
278,000 mg Iron sulfate = 56,000 mg Fe
[tex]\rm 250\;mg \;Iron\;sulfate\;=\;\dfrac{56,000}{278,000}\;\times\;250[/tex]
250 mg Iron sulfate tablet = 50.35 mg Fe.
The mass of Fe delivered by 250 mg Iron sulfate heptahydrate has been 50.35 mg.
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The figure below demonstrates what happens to white light when it passes through a prism. Which colors of lights has the highest energy? Red Yellow Greens Blues
Answer:
Blues
Explanation:
Colors of Rainbow => ROYGBIV
Red Orange Yellow Green Blue Indigo Violet
low energy => => => => => => => => => => high energy
low frequency => => => => => => => => => high frequency
long wavelengths => => => => => => => => short wavelengths
Note: All L's on the Left => low, low, long; other end are opposites.
Describe how the composition of the upper mantle is different from the lower mantle?
a. The upper mantle is made of solid rocks and lower mantle is made of melted rocks and minerals
b. The upper mantle is made of melted rocks and minerals and lower mantle is made of solid rocks
c.The upper mantle is made of lava and the lower mantle is made of magma
Answer:
b
Explanation:
Answer:
it is B hope I helped
=
Explanation:
1.What element is located at period 3, group 13?
2.Element at group 4, period 5?
Consider the chemical equations shown here.
2H2(g) + O2(g) → 2H2O(g) AH, = -483.6 kJ = 2 =-241.8 kJ/mol
302(9) ► 203(9) AH2 = 284.6 kJ = 2 = 142.3 kJ/mol
What is the overall enthalpy of reaction for the equation shown below?
3H2(g) + O2(g) → 3H20 (g)
____kJ
Answer:
-867.7kJ
Explanation:
3H2(g)+O3(g)—>3H2O(g)=
-867.7kJ
1. To calculate the molarity of a solution, you need to know the moles of solute and the
O volume of the solvents
O mass of the solution
O volume of the solution
volume of the solute
Answer:
O volume of the solution
Explanation:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / volume of solution in L
For example:
if we dissolve the 1 mole of NaCl to make the solution of volume 2 L. The molarity of solution is,
M = 1 mol / 2 L
M = 0.5 M
Democritius thought that
are the smallest particles of matter.
Please give 1 answer.
A.
Electrons
B.
Protons
C.
Neutrons
D.
Atoms
Hello! Does anyone know how the structural formula of 2, 2 dimethyl butane is? Please help!
Answer:
I have it.
Explanation:
The power has gone out and you find a flashlight that uses batteries. When you turn on the flashlight, you are transforming:
Why are electromagnetic Waves important society today?
Answer Electromagnetic waves are used to transmit long/short/FM wavelength radio waves, and TV/telephone/wireless signals or energies. They are also responsible for transmitting energy in the form of microwaves, infrared radiation (IR), visible light (VIS), ultraviolet light (UV), X-rays, and gamma rays.
Explanation:
Electromagnetic waves are important in society today because they are used to "transmit long/short/FM wavelength radio waves, and TV/telephone/wireless signals or energies. They are also responsible for transmitting energy in the form of microwaves, infrared radiation (IR), visible light (VIS), ultraviolet light (UV), X-rays, and gamma rays."
When 125g zinc carbonate is heated, 81g zinc oxide is produced.
Calculate the mass of carbon dioxide produced.
Mass of carbon dioxide=___g
Answer:
Mass of carbon dioxide= 44 g
Explanation:
Zinc carbonate → Zinc oxide + carbon dioxide
125 g = 81 g + X
X = 125 g-81 g
X = 44 g
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
What time of the year can you see Scorpius
Answer:
In the northern hemisphere I believe, Scorpius is most visible by looking to the south during July and August around 10:00 PM. The constellation remains visible until mid-September. In the southern hemisphere, Scorpio appears very high in the northern part of the sky until close to the end of September.
Answer:
October 23 to November 21
Explanation:
Not entirely sure what you are asking. . .
If we're talking Scorpius as in:
Scorpius is one of the constellations of the zodiac and is located in the Southern celestial hemisphere. Its name is Latin for scorpion, and its symbol is. (Unicode ♏).
A student bought a 1.55-ounce chocolate bar and left it in a car on a hot day.
How many ounces of chocolate are in the melted bar?

A.
Exactly 1.55 ounces

B.
An unknown number of ounces

C.
At least 1.55 ounces

D.
Less than 1.55 ounces
Answer:
A. Exactly 1.55 ounces
You use a battery to power a small hand-held fan to keep cool in the summer what way is the energy transformed?
Answer:
Chemical to electrical to kinetic energy
Explanation:
In a battery-operated fan, first, the chemical energy stored in the battery is converted to electrical energy within the fan and then the electrical energy, in turn, is converted to kinetic energy which makes the blades of the fan rotate. The rotation of the fan creates a breeze that forces the evaporation of sweat molecules from the surface of the skin and causes cooling in return.
Screen of monitors and televisions are made by ?
A- red dots
B- red , yellow and green dots .
C- red , green and blue dots
D- white dots
Answer:
C
Explanation:
This is a correct answer i think soo
what the correct answer
Answer:
sulfer has 6 energy levels/orbits and 16 valence electrons
Which characteristic do euglenoids and algae share?
Both are fungus-like protists.
Both can be autotrophic.
Both have whip-like tails.
Both are decomposers.
To solve this we must be knowing each and every concept related to autotroph. Therefore, eugenides and algae, both can be autotrophic. The correct option is option B.
What is autotroph?An creature that can make its own sustenance out of inorganic materials is known as an autotroph. Contrarily, heterotrophs are species that can't make their own nutrition and must eat other organisms in order to survive.
In contrast to autotrophs, heterotrophs are unable to manufacture their own nourishment. Heterotrophs need to consume organic material in order to produce the nutrients needed for life, not inorganic. Eugenides and algae, both can be autotrophic.
Therefore, Eugenides and algae, both can be autotrophic. The correct option is option B among all the given options.
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Which shows the general structure of an ether?
Answer:
r-o-r
Explanation:
B I'm not sure but good luck
The general structure of ether follows the R-O-R' pattern.
What is the general structure of ethers?The general structure of ether is given by:
R - O - R'Where R and R' represent alkyl or aryl groups.
In other words, ethers contain a central oxygen atom and two alkyls or aryls at the extreme ends.
Thus, the correct general structure from the options would be B.
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An object has a mass of 26.94 grams and a volume of 2.568 cubic centimeters. What material is it likely to be
made of?
Substance iron gold silver copper
Density (g/cm) 7.874 19.32 10.49 8.92
a. Silver
c. Iron
b. Gold
d. Copper
Answer:
a) silver
Explanation:
Given data:
Mass of object = 26.94 g
Volume of object = 2.568 cm³
Which subject is this = ?
Solution:
Formula:
d = m/v
by putting values
d = 26.94 g/ 2.568 cm³
d = 10.49 g/cm³
Densities of objects: g/cm³
iron = 7.874
gold = 19.32
silver = 10.49
copper = 8.92
Thus, given object is silver.
At about what temperature does the sample change phase? Justify your
answer based on the cooling curve shown above.
A student states, “When the alcohol sample was at a temperature of 500 K, all the particles were moving faster than any of the particles were moving at
400 K" Do you agree or disagree with this student's statement? Justify your
answer.
Quick Help 10 points
If the reactants of a reaction have one S and four O atoms, what will the
products have?
A. Four S atoms and four O atoms
B. One S atom and one 0 atom
O C. Four Satoms and one o atom
O D.One S atom and four O atoms
Answer:
The products will have one S and four O atoms.
How is hydroelectric power used to generate energy? (Add a real world example) !I WILL GIVE BRAINLIEST!
Answer:
an example is a dam
Explanation:
dams generate electricity, the water that flows through the dam have propellers that when turned send up energy to the generators which create power.
When Jorge looks at the Moon from Earth, he sees different phases of the Moon depending on the time of the month he observes the Moon. Why does the Moon have different phases during the month?
Answer:
Because of the revolution of the moon about the earth.
Explanation:
The moon is the natural satellite of the earth; which rotates about its axes and orbits around the earth. As the moon orbits the earth with respect to time, it would complete a revolution in 27.3 days.
During revolution, different phases of the moon can be observed by someone on the earth. This is due to its location at different time during the process. Therefore, Jorge was able to see different phases of the moon because of its revolution about the earth.
I'm very confused please help
Answer:
the food chain you mean
Explanation:
pollution than mosquitoes then alligators
If you discover a new element, how would you know where it should go on the periodic table
Answer:
the atomic number
Explanation:
it would be in the upper corner
Why is there a leap year every four years?
Answer:
Because we are not perfect
Explanation:
This day is added to the calendar as a corrective measure, because the Earth does not orbit the sun in precisely 365 days.
What common kitchen appliance uses radiation to heat food ?
Answer:
microwave
Explanation:
Answer:
Toaster ovens & Microwave
Explanation:
On the periodic table, all of the elements in Group 1 are ____________
a) considered pure.
b) do not form chemical bonds.
c) have the same number of valence electrons.
How many grams of Aluminum Oxide are produced when 3.64 g of Aluminum reacts with an excess of Oxygen?
4Al + 3O2 → 2Al2O3
_ grams of Al2O3 (round to 3 sig figs)
Answer:
6.877649 or 6.88 grams of Aluminum OxideExplanation:
- If there are 4 moles of Al that equals 107.926156 grams of 4Al.
- If there is 2 moles of Al2O3 that equals 203.9226 grams.
So...
If 107.926156 grams of 4Al equals 203.9226 grams of 2Al2O3 then, 3.64g of Al equals x.
When 6.8776g of aluminium reacts with an excess of oxygen, 6.8776g of aluminium oxide are produced.
What is aluminium?Aluminium is a silvery-white metal with atomic number 13 in the periodic table.
What is aluminium oxide?Aluminium oxide is a chemical compound of aluminium and oxygen with the chemical formula Al₂O₃. It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium(III) oxide.
The synthesis of Aluminium oxide can be done by heating aluminium in the presence of oxygen. In this reaction, 4 moles of aluminium react with 3 moles of oxygen leading to the formation of 2 moles of aluminium oxide.
4Al + 3O2 → 2Al2O3
If there are 4 moles of Al that equals 107.926156 grams of 4Al
If there are 2 moles of Al2O3 that equals 203.9226g
If 107.9261 grams of 4Al equals 203.9226 grams of 2Al2O3 then, 3.64g of Al equals x
107.9261 / 3.64 = 203.9226 / x
(107.9261) x = (203.9226) 3.64
107.9261 x = 742.2782
dividing both LHS and RHS by 107.9261,
107.9261/107.9261x = 742.2782/107.9261
x = 6.8776g
Hence, 6.8776g of aluminium oxide are produced.
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