Answer:
color
Explanation:
The effective temperature is directly related to the color of the star: the higher the temperature, the bluer the light emitted by the star.
Consider the southeast coast of north america and the northwest coast of africa. According to the current theory of plate tectonics, these two regions were once very close together. However, the coasts do not quite fit together like puzzle pieces, as one might expect. This can be explained by the fact that the southeast edge of north america's ________ actually does fit nicely with the northwest edge of africa's __________ even if the coasts do not
Answer:
Both are continental shelf's.
Explanation:
A continental shelf is the shallow underwater extension of land surrounding a continent. It makes up the edge of a landmass, even though it is under water. At some points in the Earth's past, many underwater continental shelves were once a part of dry land.
Give two physical properties of ionic compounds
Explanation:
Hope it helps you!!Waves that move through matter are called waves. Waves that move through space are called waves
Answer
Electromagnetic waves.
Explanation: Waves that Move through matter only are called Mechanical waves. Waves that move through space only are called electromagnetic waves.
Which food provides more energy for your body, tortilla chips or marshmallows? How do we determine how good provides energy to our body? Explain
Explain in terms of atomic structure why barium has lower first ionization energy than magnesium
Answer:
Barium is lower in group 2 than magnesium, so number of shells increase. The valence electron is further from the nucleus making it easier to lose electrons.
Explanation:
Barium has more electrons shells than calcium, so the nuclear shielding is stronger, and the outmost electrons are further away from the nucleus. This results in a weaker attractive force between the electron and the nucleus, so a smaller energy is required to remove it.
Answer:
Barium has a greater radius than magnesium
Explanation:
Barium and magnesium are two elements which belong to the same group, group 2A. This means that the two elements have two valence electrons in their outer shell.
The difference is, however, since barium
is lower in group than magnesium, it has
more electron shells than magnesium and,
therefore, its radlus is greater. The attraction
force between the nucleus and the valence
electrons in barium is lower as a result, as force
is inversely proportional to distance. Hence, a
lower amount of energy is required to remove
the valence electrons from barium.
Explanation:
pls mark me brainlest
if 66.38 g of potassium chloride reacts with fluorine and produces potassium fluoride and chlorine how many moles of chlorine can you get?
Taking into account the reaction stoichiometry, f 66.38 g of potassium chloride reacts with fluorine and produces potassium fluoride and chlorine, 0.4452 moles of chlorine is produced.
Reaction stoichiometryIn first place, the balanced reaction is:
2 KCl + F₂ → 2 KF + Cl₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
KCl: 2 moles F₂: 1 moleKF: 2 moles Cl₂: 1 moleThe molar mass of the compounds is:
KCl: 74.55 g/mole F₂: 38 g/moleKF: 58.1 g/moleCl₂: 70.9 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
KCl: 2 moles ×74.55 g/mole= 149.1 grams F₂: 1 mole ×38 g/mole= 38 gramsKF: 2 moles ×58.1 g/mole= 116.2 gramsCl₂: 1 mole ×70.9 g/mole= 70.9 gramsMoles of Cl₂ formedThe following rule of three can be applied: if by reaction stoichiometry 149.1 grams of KCl form 1 mole of Cl₂, 66.38 grams of KCl form how many moles of Cl₂?
[tex]amount of moles of Cl_{2} =\frac{66.38 grams of KClx1 mole of Cl_{2}}{149.1 grams of KCl}[/tex]
amount of moles of Cl₂= 0.4452 moles
Then, if 66.38 g of potassium chloride reacts with fluorine and produces potassium fluoride and chlorine, 0.4452 moles of chlorine is produced.
Learn more about the reaction stoichiometry:
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A current of 3.46 A is passed through a Sn(NO3)2 solution for 1.40 h . How much tin is plated out of the solution?
Answer:
About 10.7 grams.
Explanation:
The reduction reaction is represented by:
[tex]\displaystyle \text{Sn}^{2+}_\text{(aq)} + 2e^- \longrightarrow \text{Sn}_\text{(s)}[/tex]
A current of 3.46 amperes (C/s) is passed through the solution for 1.40 hours. The total amount of charge is hence:
[tex]\displaystyle 1.40\text{ hour} \cdot \frac{3600\text{ s}}{1\text{ hour}}\cdot \frac{3.46\text{ C}}{1\text{ s}} = 1.74\times 10^4\text{ C}[/tex]
One mole of solid Sn is transferred per two moles of electrons. Hence, using Faraday's constant:
[tex]\displaystyle 1.74\times 10^4\text{ C} \cdot \frac{1\text{ mol e$^-$}}{96485\text{ C}} \cdot \frac{1\text{ Sn}}{2\text{ mol e$^-$}}\cdot \frac{118.71\text{ g Sn}}{1\text{ mol Sn}} = 10.7\text{ g Sn}[/tex]
In conclusion, about 10.7 grams of tin is plated out of the solution.
If 25.0 g of NH₃ and 45.0 g of O₂ react in the following reaction, what is the mass in grams of NO that will be formed?
4 NH₃ (g) + 5 O₂ (g) → 4 NO (g) + 6 H₂O (g)
Answer:
44.2 g NO
Explanation:
Question is posted elsewhere, be sure to search before posting to save yourself some time :)
A hydrocarbon with this formula C4H6 is what?
a. indeterminate
b. s unstable
c. is somewhat reactive
d. is chemically inert
Let's check
C_4H_6[tex]\\ \rm\Rrightarrow C_4H_{2(4)-2}[/tex]
[tex]\\ \rm\Rrightarrow C_4H_{8-2}[/tex]
[tex]\\ \rm\Rrightarrow C_4H_6[/tex]
It has tripple bondIt follows rule C_nH_2n-2Belongs to alkyne groupSo
It's unstableOption B
It required 25.0 mL of 0.333 M NaOH solution to completely neutralize 15.0 11 mL of HCl solution. What was the molarity of the HCI? *
0.555 M
0.200 M
1.11 M
0.277 M
Answer:
A
Explanation:
HCl and NaOH is a strong acid and strong base, respectively, and hence dissociates completely and reacts to form water:
[tex]\displaystyle \text{H}_\text{(aq)}^+ + \text{OH}_\text{(aq)}^- \longrightarrow \text{H$_2$O}_\text{($\ell$)}[/tex]
We are given that 25.0 mL of 0.333 M NaOH was used to neutralize 15.0 mL of HCl.
Convert from moles of NaOH used to moles of HCl reacted:
[tex]\displaystyle \begin{aligned} 25.0\text{ mL} & \cdot \frac{0.333\text{ mol NaOH}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} \cdot \frac{1\text{ mol OH}^-}{1\text{ mol NaOH}}\cdot \\ \\ & \cdot\frac{1\text{ mol H}^+}{1\text{ mol OH}^-} \cdot \frac{1\text{ mol HCl}}{1\text{ mol H}^+}\\ \\ & = 8.33\times 10^{-3}\text{ mol HCl}\end{aligned}[/tex]
Therefore, the molarity of the original HCl solution is:
[tex]\displaystyle \begin{aligned} \ [\text{HCl}] & = \frac{\text{ mol HCl}}{\text{L soln.}} \\ \\ & =\frac{8.33\times 10^{-3}\text{ mol HCl}}{15.0\text{ mL}} \cdot \frac{1000\text{ mL}}{1\text{ L}} \\ \\ & = 0.555\text{ M}\end{aligned}[/tex]
In conclusion, our answer is A.
Is 18 karat gold a homogeneous mixture or heterogeneous mixture?
Answer:
Gold is an element. That means that it is the same all the way through and in an ideal state of purity contains nothing but gold atoms. Therefore it is not a mixture. In such a case it is as close to a uniform solid solution as may be, so it will be an homogeneous mixture.
Explanation:
really hope this helps :)
Which of the following happens when a reaction reaches dynamic equilibrium in a closed system?
The concentrations of the reactants and products increase.
The concentrations of the reactants and products decrease.
The rate of the forward reaction equals the rate of the reverse reaction.
The rate of the forward reaction is slower than the rate of the reverse reaction.
Answer:
Option C
Explanation:
At equilibrium the reaction remains constantThe rate of forward reaction equals rate if backward reactionConcentration of products and reactants remains sameAnswer:
The rate of the forward reaction equals the rate of the reverse reaction.
Explanation:
What is the temperature, in kelvin, of 4.15 moles of a gas at a pressure of 7.30 atmospheres in a 21.7 liter container?
P
V
=
n
R
T
R = 0.0821
a
t
m
⋅
L
m
o
l
⋅
K
Answer:
461.91 Kelvin
Explanation:
P = 7.30 atm
V = 21.7 liters
n = 4.15 moles
R = 0.0821 atm
T = ?
PV = nRT
(7.30) (21.7) = (4.15) (0.0821) (T)
158.41 = 0.34 (T)
T = 465.91 Kelvin
Which of the following lists describes characteristics of a base? (3 points) Bitter taste, high pH, and caustic Bitter taste, low pH, and slippery Sour taste, high pH, and dissolves metals
Bitter taste, high pH, and caustic Bitter are the characteristics of base.
What are the characteristics of base?Bases have bitter taste, soapy feel, turn red litmus paper blue. Bases are substances that contain metal oxides or hydroxides. Its pH is higher than 7 up to 14.
So we can conclude that bitter taste, high pH, and caustic Bitter are the characteristics of base.
Learn more about base here: https://brainly.com/question/3948796
Answer:
Bitter taste, high pH, and caustic
Explanation:
I took the test :)
If 25 mL of a 1 M HI solution is added to 25 mL of a 1 M KOH solution, the resulting solution would be
The reaction equation is:
HI(aq) + KOH(aq) → KI(aq) + H2O
1 mol HI reacts with 1 mol KOH
In your problem you have:
Mol HI in 10 mL of 1M solution = 10mL/ 1000 mL/L * 1 mol /L = 0.01 mol HI
Mol KOH in 5 mL of 1 M solution = 5 mL / 1000 mL/L * 1 mol /L = 0.005 mol HI
The 0.005 mol of KOH will neutralise 0.005 mol of HI - leaving 0.005 mol HI unreacted in 15 mL solution
This solution will be acidic
I guess that that answers your question - But you may be interested in calculating the pH of the solution
Have a great day!
Which type of intermolecular forces is present in all substances regardless of polarity?.
Answer:
Dispersion forces are present between all molecules, whether they are polar or nonpolar. Larger and heavier atoms and molecules exhibit stronger dispersion forces than smaller and lighter ones.
Explanation:
hope this helps
As ocean water salt concentration increases, the _____.
Question 1 options:
water density increases and rises to the top of the sea.
water density increases and sinks to the bottom of the sea.
water density decreases and rises to the top of the sea.
water density decreases and sinks to the bottom of the sea.
Answer:
B water density increases and rises to the top of the sea
Explanation:
i took a test and got it correct lol
Given bh3, o3, co2, and nh3, which of these compound is an exception to the octet rules?.
Answer:
a. BH₃
Explanation:
According to the octet rules, atoms reach stability when are surrounded by eight electrons in their valence shell when they combine to form a chemical compound.
From the options, the only compound in which the central atom does not meet the octet rules is BH₃. The central atom is boron (B), which has 3 electrons in its valence shell. When B is combined with hydrogen (H), 3 electrons from the 3 atoms of H are added. The total amount of electrons is 6, fewer than 8 electrons needed to meet the rule.
hope this helps
Complete the following calculations regarding acid/base titrations
If 25.5 mL of a 0.1 M base solution was required to ti trate 60 mal of an unknown acid solution,what is the molarity of the acid solution?
Based on the information provided and the assumption that the mole ratio of the acid to the base is 1:1, the molarity of the acid would be 0.0425 M
Acid/base TitrationUsing the equation:
CaVa = CbVb
This is based on the assumption that the stoichiometric mole ratio of the acid to the base is 1:1.
Ca = CbVb/Va
0.1 x 25.5/60 = 0.0425 M
More on acid/base titration can be found here: https://brainly.com/question/2728613
What is the origin of fahrenheit and centigrade temperature scales?.
Answer:
The 18th-century German physicist Daniel Gabriel Fahrenheit originally took as the zero of his scale the temperature of an equal ice-salt mixture
Explanation:
Why is the number of hydrogen atoms and oxygen atoms the same in both the reactants and the products?
Answer:
The law of conservation of matter says that matter cannot be created or destroyed.
Explanation:
Answer:
Atoms don’t appear or disappear during the reaction. Instead, they get rearranged.
Explanation:
Edmentum answer
REEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
Answer:
c. sun, radiation
Explanation:
A scientist obtains a flask of oxygen gas with a temperature of 314 K and a volume of
exactly 100 liters. If the flask contains 88 moles of gas, what is the pressure?
Answer:
22.11 atm
Explanation:
Use the ideal gas law PV=nRT
P(100)=88(.08)(314)
100P=2210.56
P=22.11 atm
Which of these involves the formation of a new chemical substance?
Select one:
a. evaporation of gasoline
b. mixing salt and pepper
C. dissolving sugar in tea
d. rusting of an iron chain
Which of these involves the formation of a new chemical substance?
a. evaporation of gasoline
b. mixing salt and pepper
c. dissolving sugar in tea
d. rusting of an iron chain
[tex] \\ [/tex]
Answer:D. Rusting of an iron chain[tex]__________[/tex]
A. Evaporation of gasoline
It does not form any chemical substance. Evaporation, is part of a physical change. Physical change only changes in its physical characteristics. Evaporation changes from liquid, to gas. Therefore, it is a physical change.B. Mixing salt and pepper
No new substance formed. It does not form any chemical substance nor chemical change. When you mix salt and pepper, it only is a mixture wherein no new material can be form. Therefore, this is physical change as well.C. Dissolving sugar in tea
When you dissolve sugar in your tea, it only changes the taste of the tea to sweet. Taste is part of the characteristic of physical change. It does not form any chemical substance nor chemical change. Therefore, this is physical change.D. Rusting of an iron chain
Rusting is one of the common examples of chemical change in our daily lives. Rust is the new substance formed. However, this is considered as chemical change because this is irreversible or cannot be returned to its original substance/material. Finally, rusting of an iron chain involves the formation of new chemical substance.Hence, the answer is D. Rusting of an iron chain.
What is the boiling point of milk in degrees celsius?.
Answer:
Milk's boiling temperature is nearly identical to that of water, 100 degrees Celsius (212 degrees Fahrenheit)
Explanation:
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: ()zn ()hcl → ()zncl2 ()h2
Based on the chemical equation, to balance the equation we use 2 as a coefficients of HCl on left hand side of reaction.
What is balanced equation?Balanced chemical equations are those equation in which each entities are present in same amount on left side as well as on the right side of the chemical reaction.
Given chemical reaction is:
Zn + HCl → ZnCl₂ + H₂
Above reaction is not balanced equation as number of chlorine and hydrogen atoms are not same, so balanced equation will be:
Zn + 2HCl → ZnCl₂ + H₂
Hence we add 2 as a coefficient of HCl to balance the equation.
To know more about balance equation, visit the below link:
https://brainly.com/question/26694427
Answer:
1 2 1 1
Explanation:
im yes hi okay no bye
One way to identify the type of radioactive decay produced in a reaction is to pass the emission through an electric field Describe the type of radioactive emission produced from the decay of uranium- 238 to thorium-234 and its reaction to the electric field
A) Radioactive gamma decay is produced by the reaction. This neutral electromagnetic radiation are not attracted to the electric field
B) Beta particles are released during the radioactive decay. These negative particles are attracted to the positive plate in the electric field.
C) During the radioactive decay, alpha particles are released. These positive particles are attracted to the negative plate in the electric field.
D) Both types of radioactive emissions, particles and electromagnetic radiation are produced during this decay. None of these are attracted to the electric field
Decay of Uranium-238 produces gamma radiaton whereas decay of thorium-234 releases beta radiation.
What type of radiation is produced?In the decay of U-238, two gamma rays of different energies are emitted in addition to the alpha particle while on the other hand, in the decay of thorium-234 , beta rays are emitted.
So we can conclude that decay of Uranium-238 produces gamma radiaton whereas decay of thorium-234 releases beta radiation.
Learn more about decay here: brainly.com/question/25537936
Answer:
Yes its
C. During the radioactive decay, alpha particles are released. These positive particles are attracted to the negative plate in the electric field.
Explanation:
Just got it right on USATP
You are asked to make 500 mL of a 0. 250 M sodium chloride (NaCl) solution.
a. How many moles of NaCl would you need?
b. How many grams of NaCl would you need? (gfm = 58 g/mol)
Answer:
a. .125 mol b. 7.25g
Explanation:
a. To get the moles multiply the volume by the molarity.
.5L*.25M=.125mol NaCl
b. The molar mass is provided so multiply the moles by the molar mass to get the amount of grams of nacl.
.125mol*58molar mass=7.25g nacl to make the solution
Mosquitoes are responsible for transmitting the zika virus. In this case, the mosquitoes are
the disease.
asymptomatic transmitters.
biological vectors.
pathogens.
active carriers.
Answer:
active carriers
Explanation:
Mosquitoes are responsible for transmitting the zika virus. In this case, the mosquitoes are active carriers
Answer:
E -- active carriers
Explanation:
the mosquitos would be active carriers...
Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Also remember to rate answers to help other students, While leaving thanks to answers that help you. Have a great day!
Describe the different seasonal changes of the weasel in Florida and the weasel in Wyoming during the
winter season.Science
Answer:
molting allows for this adaptaion.
its fur slowly changes color
thanks!
Explanation:
Answer:
The differences between the Florida's weasel and in Wyoming's is that I can see that in Wyoming it has a lot of snow so Wyoming's weasel fur is more thicker than Florida's weasel.
Explanation:
Overmore, in Florida's weasel the weasel's fur is much more less then Wyoming's weasel's fur. Subsequently, their fur color is very different. In Wyoming's weasel fur, it's white fur help them blend in the snow. In Florida's weasel fur, it's brown and help blend in the grass(soil).