Answer:
a) melting point
Which of the following changes will lead to an increase in the rate of dissolving.
a. increasing the surface area of the solute
b. stirring the solution
c. increasing the temperature of the solution
d. All of the above
In an ideal gas, entropy is a measure of the
Answer:
Entropy is a measure of the degree of spreading and sharing of thermal energy within a system. For an ideal gas that expands at a constant temperature (meaning that it absorbs heat from the surroundings to compensate for the work it does during the expansion), the increase in entropy is given by ΔS= R1n (V2/V1)
Explanation:
hope this helps!
Summer happens in Vermont when the sun's rays hit it less or more directly than any other time of year .
Answer:
More directly.
Explanation:
Summer happens in Vermont when the sun's rays hit it more directly than any other time of year because this direct angle causes more warm environment. In the winter season, the angle of sun is about 45° due to which the place receives less solar radiation and the environment is cold while on the other hand, in the summer season the angle of the sun is about 90° due to which direct sunlight occurs on the region that causes warm and hot environment.
Two hydrogen atoms covalently bond to form a hydrogen molecule.
What is true about the hydrogen molecule?
A-The hydrogen molecule can have more or less energy than the hydrogen atoms.
B-The hydrogen molecule has less energy than the two atoms.
C-The hydrogen molecule has the same energy as the two atoms.
Answer:
B
Explanation:
the energy of two separate hydrogen atoms decreases as they approach each other, and the single electrons on each atom are shared to form a covalent bond.
distinguish between electron and neutron
Answer:
Explanation:
Electrons are a type of subatomic particle with a negative charge
Neutrons are a type of subatomic particle with no charge (they are neutral)
What number represents a mole?
5
1
4
14
8
6
19
The diagram shows the electron configuration of an atom of an element for the electrons in the s and p orbitals.
What is the group number of the element in the periodic table?
A) 1
B) 2
C) 13
D) 15
Answer:
The answer would be 15, letter D.
Explanation:
Since it has 5 electrons in its outermost shell, it will be located in group 15 in the periodic table.
The electron configuration of an atom of an element for the electrons in the s and p orbitals 15th group number of the element in the periodic table option D is correct.
What is electronic configuration of 15th group?Tha common electronic configuration of 15th group elements in ns2 np3, Group 15 elements in the modern periodic table are known as the pnictogens which means suffocation in Greek language.
This group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb) and bismuth (Bi).
The group 15 elements consist of five valence electrons. Due to this the elements can either lose five electrons or gain three electrons in order to attain the stable configuration. The general electronic configuration of nitrogen family is ns 2 np 3.
therefore , because of ns2 np3 option D is correct.
Learn more about electronic configuration , here :
https://brainly.com/question/13497372
#SPJ2
WILL MARK BRAINLEST
Which of the following are sources of greenhouse gasses? Select all that apply
a
Bike Riding
b
Cow Farts
c
Growing Trees
d
Burning Coal
e
Car Exhaust
Answer:
b and c
Explanation:
sorry if i'm wrong
Answer:
b, c, d, e
Explanation:
How many formula units are in 2.0 moles of Fe(NO3)2?
Answer:
1.2 x 10>24 (2.0)(6.022 x 10>23)
Explanation:
How many formula units are in 2.0 moles of Fe(NO3)2?
Mole measure the number of elementary entities of a given substance that are present in a given sample. 12.044×10²³ formula units are in 2 moles of Fe(NO₃)₂.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Mole is inversely proportional to molar mass.
Mathematically,
Mole of Fe(NO₃)₂. =given number of atoms of Fe(NO₃)₂.÷ 6.022×10²³(Avogadro number)
mole of Fe(NO₃)₂= 2moles
Substituting the values
2=number of atoms of Fe(NO₃)₂.÷ 6.022×10²³
Number of atoms of Fe(NO₃)₂.=2×6.022×10²³
Number of atoms of Fe(NO₃)₂.=12.044×10²³
Therefore, 12.044×10²³ formula units are in 2 moles of Fe(NO₃)₂.
To know more about mole, here:
https://brainly.com/question/15209553
#SPJ3
Given this balanced equation: CS2 + 3 O2 CO2 + 2 SO2
Calculate how many moles of SO2 can be produced with when given 4 moles of CS2.
58.67 g
Now calculate how many moles of SO2 can be produced with when given 4 moles of O2.
Which one is the limiting reactant (4 moles CS2 or 4 moles of O2)? How do you know?
Answer: The FitnessGram PACER Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The test is used to measure a student's aerobic capacity as part of the FitnessGram assessment. Students run back and forth as many times as they can, each lap signaled by a beep sound.
Explanation:
Nitric acid+ calcium oxide gives what
Answer:
HNO3 + Ca(OH)2 ====> H2O + Ca(NO3)2
it gives water and Calcium nitrate
Hope to helpfull.
Answer:
HNO3 + Ca(OH)2 ====> H2O + Ca(NO3)2
A 220.0 mL sample of helium gas is in a cylinder with a movable piston at 105 kPa and 275 K. The piston is
pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310 K. What is the new
pressure of the sample?
274 kPa
216 kPa
Piston
243 kPa
51.1 kPa
Answer:
Explanation:
what did you get?
Is the following chemical equation balanced? 1 C2H6+ 102 - 3 H2O + 2
CO2 *
Answer:
No
Explanation:
Answer: smallest whole numbers are 2, 7, 4 and 6
Explanation: C2H6 + 3.5 O2. ⇒ 2. CO2 + 3 H2O
10 How does no-till farming help the environment?
A It decreases soil erosion.
C It increases fertilizer use.
B It increases soil removal.
D It decreases crop yield.
Answer: Answer is A it will decrease soil erosion
Explanation:it just will trust me
Answer:
A.
Explanation:
the soil will not loosen when u till it
A container has a volume of 5.85 L and a pressure of 4.25 atm. What will the volume be
If the containers pressure is changed to 2.75 atm?
Answer:
9.04 LExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we're finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
We have
[tex]V_2 = \frac{4.25 \times 5.85}{2.75} = \frac{24.8625}{2.75} \\ = 9.0409...[/tex]
We have the final answer as
9.04 LHope this helps you
Use the kinetic energy equation to explain why speed has a greater impact on kinetic energy than mass.
Answer: Hopefully this helps! sorry if not. :))
Speed has a greater impact on mass because its increases in velocity have an exponentially greater impact on translational kinetic energy because kinetic energy is proportional to velocity squared. Doubling an object's mass would only double its kinetic energy, however doubling its momentum would quadruple its velocity.
Which of these is a learned behavior of a dog?
1.Begging for food
2.Drinking water
3.Panting on a hot day
4.Chewing on a bone
24
Select the correct answer.
Which statement is correct?
A.
When the concentration of the reactant decreases, the cell potential increases.
B.
When the concentration of the reactant decreases, the cell potential does not change.
C.
When the concentration of the reactant increases, the cell potential decreases.
D.
When the concentration of the reactant increases, the cell potential increases.
E.
When the concentration of the reactant increases, the cell potential does not change.
Answer:
the answer is b
Explanation:
Waves that we cannot actually see (unlike ripples in water) and that DO NOT need a medium to travel through belong to which category of waves?
Answer:
electromagnetic waves
Explanation:
The waves that do not need a medium to travel through are known as electromagnetic waves.
What are electromagnetic waves?These waves do not need any medium for their propagation or traveling. The waves have different wavelength and energy factors depending upon their rate of propagation. EMR waves travel from the sun to the earth in space.
Examples of electromagnetic waves are Xrays, gamma rays, radio waves, and more.
Find more information about electromagnetic waves here:
brainly.com/question/25847009
some plz help me make mnemonic to helpme remember the oder of the planets
Answer:
My - Mercury
Very- Venus
Excited- Earth
Mother- Mars
Just- Jupiter
Served- Saturn
Us- Uranus
Nachos- Neptune
Explanation:
Mark me Brainliest?
Answer:
My very encouraging made just us nachos
Explanation:
My stands for Mercury
Very stands for venus
Encouraging- Earth
made- Mars
just- Jupiter
Us- Uranus
Nachos- Neptune
Si tenemos una solución de ácido láctico 0.025M con un pH = 2.75. ¿Cuál es la constante de equilibrio Ka?
Answer:
La constante de equilibrio Ka del ácido láctico es 1.38x10⁻⁴.
Explanation:
El ácido láctico es un ácido débil cuya reacción de disociación es la siguiente:
CH₃CHOHCOOH + H₂O ⇄ CH₃CHOHCOO⁻ + H₃O⁺ (1)
0.025M - x x x
La constante de acidez del ácido es:
[tex] Ka = \frac{[CH_{3}CHOHCOOH^{-}][H_{3}O^{+}]}{[CH_{3}CHOHCOOH]} [/tex]
Sabemos que la concentración del ácido inicial es:
[CH₃CHOHCOOH] = 0.025 M
Y que a partir del pH podemos hallar [H₃O⁺]:
[tex] pH = -log[H_{3}O^{+}] [/tex]
[tex] [H_{3}O^{+}] = 10^{-pH} = 10^{-2.75} = 1.78 \cdo 10^{-3} M [/tex]
Debido a que el ácido se disocia en agua para producir los iones CH₃CHOHCOO⁻ y H₃O⁺ de igual manera (según la reacción (1)), tenemos:
[CH₃CHOHCOO⁻] = [H₃O⁺] = 1.78x10⁻³ M
Y por esa misma disociación, la concentración del ácido en el equilibrio es:
[tex] [CH_{3}CHOHCOOH^{-}] = 0.025 M - 1.78 \cdo 10^{-3} M = 0.023 M [/tex]
Entonces, la constante de equilibrio Ka del ácido láctico es:
[tex] Ka = \frac{[CH_{3}CHOHCOOH^{-}][H_{3}O^{+}]}{[CH_{3}CHOHCOOH]} = \frac{(1.78 \cdo 10^{-3})^{2}}{0.023} = 1.38 \cdot 10^{-4} [/tex]
Espero que te sea de utilidad!
If the prescribed dosage of milk of magnesia Mg(OH)2 is 3.5 moles, how many grams
would you need to take? Round to the nearest tenth (one digit after the decimal).
A. 92.1 g
B. 204.2g
C. 157.2 g
D. None of the above
Answer:
B
Explanation:
1 mole is equal to 58.31968 grams.
so 3.5 moles equal to answer choice B
If you put 100g of NaOH in cube form and 200g of NaOH in powered form which will react with HCl at a faster rate? Explain why
Answer:
200g of NaOH in powered form will react with HCl at a faster rate
Explanation:
200g of NaOH in powered form will react with HCl at a faster rate because it is in powdered form and it will have high surface area to volume ration and hence high reactivity and rate of reaction as compared to the cube NaOH.
how many daughter cells would be produced if 32 cells undergo meiosis
Answer:
The meiosis process can for up to 4 daughter cells
Science 3 questions with brainliest
Answer:
#1 is c #2 is d and #3 isd
Explanation:
6. Soap contains 76.5% C, 11.3% O, and 12.2% H and the MW = 847, what is the
molecular formula?
Answer:
the molecular formula of the soap is C₅₄H₁₀₂O₆
Explanation:
Given;
composition of carbon, C = 76.5%
composition of oxygen, O = 11.3%
Composition of hydrogen, H = 12.2%
The empirical formula is calculated as follows;
C: 76.5% / 12 O: 11.3% / 16 H: 12.2% / 1
= 6.375 = 0.706 = 12.2
Divide through by the least number (0.706);
= 6.375/0.706 = 0.706 / 0.706 = 12.2 / 0.706
= 9 = 1 = 17
The empirical formula = C₉H₁₇O
The molecular formula is calculated as follows;
(C₉H₁₇O)n = 847
(9 x 12 + 17 x 1 + 16 x 1)n = 847
(108 + 17 + 16)n = 847
141n = 847
n = 847/141
n = 6
The molecular is (C₉H₁₇O)6 = C₅₄H₁₀₂O₆
Therefore, the molecular formula of the soap is C₅₄H₁₀₂O₆
2 Al + 3 Br2 --> 2 AlBr3
If 15.0 grams of AlBr3 are produced, how many grams of aluminum are needed?
Round your answer to two decimals.
Please i need this asap
Since AlBr3 is the sole product, we can use its coefficient to determine its molar ratio with Al. Conveniently, that ratio is 2:2 or, simplified, 1:1, which means that the number of moles of AlBr3 produced is equivalent to the number of moles of aluminum consumed in the reaction.
We must determine the number of moles of AlBr3 produced; we are given the mass of AlBr3 produced, so we divide the mass by the molar mass of AlBr3:
(15.0 g)/(266.694 g/mol) = 0.05624 mol AlBr3
Since the molar ratio of AlBr3:Al is 1:1, that means 0.05624 moles of Al were reacted. Now, all that is left is to convert the number of moles of Al to grams. We multiply the number of moles by the molar mass of Al:
(0.05624 mol)(26.982 g/mol) = 1.52 grams Al.
So, if 15.0 grams of AlBr3 are produced in this reaction, 1.52 grams of Al are needed.
TRUE OR FALSE
All of the elements on Earth, except for hydrogen, were formed in the interiors of stars.
Answer:
True
Explanation:
I checked several websites to double check for you.
Answer:
Except for hydrogen and some helium created in the Big Bang, all of the stuff we, and the Earth around us, are made of, was generated in stars, through sustained fusion or in supernova explosions i thank its true :) hope this helps
HELP PLS THANK YA!!!
Answer:
there is the answers. hope this helps
A sample of 1.00 moles of oxygen at 50°C and 98.6 kPa, occupies what volume?
Answer:
27.22 dm³
Explanation:
Given parameters:
number of moles = 1 mole
temperature= 50°C, in K gives 50+ 273 = 323K
Pressure= 98.6kpa in ATM, gives 0.973 ATM
Solution:
Since the unknown is the volume of gas, applying the ideal gas law will be appropriate in solving this problem.
The ideal gas law is mathematically expressed as,
Pv=nRT
where P is the pressure of the gas
V is the volume
n is the number of moles
R is the gas constant
T is the temperature
Input the parameters and solve for V,
0.973 x V = 1 x 0.082 x 323
V= 27.22 dm³