Answer: 18
Explanation:
i took a test and reviewed it and it said 18
On the periodic table, group IA has the most metallic elements.
What is Periodic table?All identified chemical elements are arranged in rows (referred to as periods) and columns (referred to as groups) in the periodic table of chemical elements, also known as the periodic table, in ascending order of atomic number.Groups are the names given to the periodic table's columns. In the table, individuals who belong to the same group make bonds of the same kind and have an equal number of electrons in their atoms' outermost shells. The periods refer to the horizontal rows.Elements in the periodic table can be divided into groups and eras. The periodic table is organized into horizontal rows for periods and vertical columns for groupings. As you advance, the atomic number grows.To learn more about Periodic table refer to:
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HELP MEEE PLEASEEEEEEEEEEEEEE
I think its the sea cucumber and sea urchin
but it could be the star too
This is agree or disagree I need help ASAP!!
Answer:
disagree
sometimes they attract
Explanation:
Answer:
Explanation:
2. Agree
3. Agree
4. Agree
5. agree
6. disagree
If im wrong its because im tired lol
A greenhouse is filled with air that cotains more carbon dixoide than normal air has. How might phothsyphness and plant growth be affeacted
Answer:
See explanation
Explanation:
We know that photosynthesis involves the combination of carbon dioxide and water in the presence of sunlight to yield glucose.
If the atmosphere is rich in carbon dioxide such as in a green house where air is filled with carbon dioxide, the rate of photosynthesis is increased.
As the rate of photosynthesis is increased, the growth of plants is also increased.
Hence, in a greenhouse where the air contains more carbon dioxide, the rate of plant growth increases.
Drag the item to the corresponding match PLSS help me!!!
Answer:
I can't see picture sorry
i. Write the dissolution reaction of BaF2, including all states. (0.5 points)
BaF2←>Ba2+(aq)+2F-(aq)
ii. Write the expression for Ksp for BaF2. (0.5 points)
iii. Write the Ksp expression as an algebraic equation, using the variable x to represent concentrations. (1 point)
iv. Find the solubility of BaF2 by solving the equation you wrote in part iii. (0.5 points)
Answer:
See Explanation
Explanation:
i) The equation of the dissolution of BF2 is;
BaF2(s)⇄Ba2+(aq)+2F-(aq)
ii) Ksp =[Ba2+] [2F-]^2
iii) Let the concentration/solubility of [Ba2+] and [2F-] be x
Ksp = [x] [2x]^2
Ksp = 4x^3
iv) x =∛Ksp/4
Use the drop-down menus to identify the experimental group with additional nutrients and the control group without additional nutrients. The experimental group consists of quadrats numbered? The control group consists of quadrats numbered?
The comparison of the results obtained from the experimental and the control groups validates the conclusions of the experiment.
What are experimental and control groups?The question is incomplete but I will, try to help you the much I can. The term experimental groups refer to the group that recieves the treatment while the control group is the group that did not receieve the treatment.
Hence, the comparison of the results obtained from the experimental and the control groups validates the conclusions of the experiment.
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Answer:
The experimental group consists of quadrats numbered
✔ 1 to 16 or A
.
The control group consists of quadrats numbered
✔ 17 to 32 or B
.
Explanation:
Which of the following is NOT an example of a chemical reaction?
a. sodium and chlorine forming salt
b. a candle burning forming carbon dioxide
c. a marshmallow releasing carbon when burned
d. ice turning into water
A) Sodium and chlorine forming salt, in this reaction salt is a new product with different properties than sodium or chlorine
Therefore it is a chemical reaction
B) A candle burning to form carbon dioxide, in this reaction carbon dioxide is a new product with different properties than the candles wax
Therefore it is a chemical reaction
C) Marshmallow releasing carbon is similar to the above one
Therefore it is a chemical reaction
D) Ice turning into water, in this reaction the water can be transformed into ice by freezing it
Therefore it is not a chemical reaction
The answer to your question is D) Ice turning into water
Happy to help :)
If you need anymore help, feel free to ask
A 2.50 L sample of butane gas (C4H10), measured at 22.0
oC and 1.20 atm pressure, is combusted completely and
the carbon dioxide gas collected at the same pressure and
temperature. What volume of CO2 is produced?
Answer:
Same i guess hdjekfhkshfjfkr
The resultant volume of the carbon dioxide gas which is produced by the combustion of butane is 14.4L.
How do we calculate the moles of gas?Moles of any gas will be calculated by using the ideal gas equation as:
PV = nRT, where according to qustion for butane gas
P = pressure = 1.20 atm
V = volume = 2.50L
n = moles = ?
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature = 22 degree celsius = 295.15 K
On putting values we get
n = (1.20)(2.50) / (0.082)(295.15) = 0.124 moles
Given chemical equation is:
C₄H₁₀ + 13/2O₂ → 4CO₂ + 5H₂O
From the stoichiometry of the reaction, it is clear that,
1 mole of C₄H₁₀ = produces 4 moles of CO₂
0.124 mole of C₄H₁₀ = produces 4×0.124=0.496 moles of CO₂
Now we calculate the volume for the carbon dioxide gas at the given pressure and temperature as:
V = (0.496)(0.082)(295.15) / (1.20) = 14.4 L
Hence required volume of CO₂ is 14.4 L.
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Each element has its own set of characteristic absorption lines because Each element has its own set of characteristic absorption lines because the temperature of each element can varies. electron energy levels differ for each element. elements can exist in different forms of matter. absorption lines depend upon the speed of the object. each element has a different mass.
Answer:
Question is unclear
Explanation:
Answer:
what ru asking dear??? write question properly ??? Write the correct question from next time.
Can anyone help me out?
Which is the formula for a binary ionic compound composed of
iodine and sodium?
a Ina
b Either INa or Nal is acceptable.
С
lodine and sodium do not form a binary ionic
compound.
d Nal
Answer:
D. Nal
Explanation:
Took a K12 test and it was correct! :3 Hope this helps!
HELPPPPPPP PLEASEEEE
Answer:
Plant and Animal
Explanation:
The others are not accurate
I need help on this and the first person who answer correctly gets a BRANLIST..
I dont know if I pick the right answer so thats why I need help!!
Answer:
1 oxygen
Explanation:
cause H2O= two hydrogen + one oxyge
During the chemical reaction given below 21.71 grams of each reagent were allowed to react. Determine how many grams of the excess reagent are left over after the reaction is complete. 2SO2()+O2()⟶2SO3()
Answer: 16.32 g of [tex]O_2[/tex] as excess reagent are left.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} SO_2=\frac{21.71g}{64g/mol}=0.34mol[/tex]
[tex]\text{Moles of} O_2=\frac{21.71g}{32g/mol}=0.68mol[/tex]
[tex]2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)[/tex]
According to stoichiometry :
2 moles of [tex]SO_2[/tex] require = 1 mole of [tex]O_2[/tex]
Thus 0.34 moles of [tex]SO_2[/tex] will require=[tex]\frac{1}{2}\times 0.34=0.17moles[/tex] of [tex]O_2[/tex]
Thus [tex]SO_2[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess reagent.
Moles of [tex]O_2[/tex] left = (0.68-0.17) mol = 0.51 mol
Mass of [tex]O_2=moles\times {\text {Molar mass}}=0.51moles\times 32g/mol=16.32g[/tex]
Thus 16.32 g of [tex]O_2[/tex] as excess reagent are left.
You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2?
Answer:
79.14%
Explanation:
Given the equation : 2Fe2O3 + 3C 4Fe + 3C02
The theoretical yield of CO2 ; is 102.6g
Actual yield = 81.2 gram
Percentage yield = (actual yield / theoretical yield) * 100%
Percentage yield = (81.2 / 102.6) * 100%
Percentage yield = 0.7914230 * 100%
Percentage yield = 79.14%
Hence, tbe percentage yield of CO2 is 79.14%
what is the advantage of rusting
Answer:
Provide more strength
Explanation:
Rust is metal that has been oxidised . Oxides are usually more fragile and porous than their crystals metal equivalents. Some oxides, such as Aluminum oxide, are useful because they have a thin, strong shell that protects the metal from further corrosion.
Neon occupies a volume of 6 L at 200 K. What volume will it occupy at 300 K
Answer: 9L
Explanation:
(6 x 300) = 1800 / 200 = 9
How many grams are in 2.4mol sulfur, S?
A.)77g
B.)6.2x10^2g
C.) 0.075g
Answer:
77.0 grams S
What is the mass in grams of 4.4 moles of the element tungesten, W?
Answer:
806.96 g
Explanation:
From the question,
Using,
No. of mole = reacting mass/molar mass.
n = R.m/m.m....................... Equation 1
make R.m the subject of the equation
R.m = molar mass of tungsten × number of mole of tungsten.................. Equation 2
Given: number of mole of tungsten = 4.4 moles
Constant: Molar mass of tungsten = 183.8 g/mol
Substitute these values into equation 2
Therefore,
mass of tungsten = 4.4×183.4
mass of tungsten = 806.96 g
809.6g is your answer
Answer:
1 mole of tungsten =184 g
4.4 mole of tungsten =184×4.4=809.6g
What does oxygen hitch a ride on to move from the lungs to the blood and eventually the heart? Your answer
What is the molar mass of Mn2Se7 ?
A.) 601.34 g/mol
B.) 542.50 g/mol
C.) 662.60 g/mol
Answer:
C. 662.60
Explanation:
the mass of Mn is about 54 grams/mol, (multiply that by 2 since there are 2 Mn's).
the mass of Se is about 79 grams/mol, so multiply that by 7
if you add them, you get 662.60 (approxamitly)
Answer:
C) 662.60
Explanation:
~~55*2 + 79*7 = 110 + 553 = 663 (~~662.60)
What volume of 7.68 M NaOH (aq) will neutralize 1.15 L of 2.35 M H2SO4 (aq) ?
A)1.38 L
B)0.704 L
C)0.276 L
D)1.90 L
E)1.75 L
If a star is 300 light years away from Earth, how long does it take light from that star to reach Earth?
A. 300 days
B. 300 hours
C. 300 years
D. 300 light years
Answer: It would take 300 light years to reach Earth.
Explanation:
How many molecules are in 9.40 moles of AICI3?
A sample of gas has a volume of 12.0 L and a pressure of 2.00 ATM. If the pressure of gas is increased to6.00 ATM, what is the new volume of the gas
Answer:
4L
Explanation:
Where did scientists find most of the nitrogen that the rats ate?
Answer:
They found the rats near or in a lake or river, due to high concentration of nitrogen in their body.
An open glass of water is placed on the table. After a while, the temperature and volume of the water are both altered. What kind of system does this describe?
Answer: Open system
Explanation:
I guessed and I got the right answer
80.0 grams of NaOH is dissolved in water to make a 6.00 L
solution. What is the molarity of the solution? (Molar mass of NaOH
= 40.0 g/mol)
M М.
Answer:
0.333 M
Explanation:
Divide the mass of NaOH by the molar mass and then divide by the volume.
80.0 g / 40.0 g/mol = 2.00 mol NaOH
2.00 mol NaOH / 6.00 L = 0.333 M NaOH
Which of the following describes a solution equilibrium? *
Solution equilibrium is the physical state in which the opposing processes of dissolution and crystallization of a solute occur at equal rates.
the internal energy of a substance Is called
Answer:
The internal energy is the total amount of kinetic energy and potential energy of all the particles in the system. ... When the substance melts or boils, energy is put in to breaking the bonds that are holding particles together, which increases the potential energy.
Explanation: