The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.
W = mg
Weight of object = mass of object × acceleration of gravity
how many mL of 0.1M HCl are required to react completely with 1 g mixture of [tex] Na_{2}CO_{3}[/tex] and [tex] NaHCO_{3} [/tex] containing equimolar amounts of both ?
ty! :)
Answer:
158 mL
158 mL of 0.1 M of HCl is required to react completely with 1 g mixture of Na2CO3 and NaHCO3, containing equimolar amounts of both
Explanation:
hope helpez -,-~
btw masoom bachi copied me~
help me with this one please.
calculate the solubility of AgCl in:
100ml of 4×10^-3M calcium nitrate
(Ksp is = 1.6 ×10^-10)
contribution of chemistry in medicines
Answer:
Chemistry in Medicine
Explanation:
Major contributions to health care have been made by chemistry. The development of new drugs involves chemical analysis and synthesis of new compounds. Many recent television programs advertise the large number of new
drugs produced by chemists.
BRAINLIEST MEEEE PLSS
Calculate the [H+], given the pH is 2.5
a
0.31 M
b
0.25 M
c
0.50 M
d
0.003 M
Answer:
D. 0.003
Explanation:
To find [H+] given pH, you do 10^-[pH]
10^-2.5 = 0.003
A tank (not rigid) contains 2.3L of
helium gas at 25°C. What will be the
volume of the tank after heating it
and its content to 40°C temperature
at constant pressure?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Convert
Temp to Kelvin25°C=298K40°C=313KApply Charles law
V1T2=V2T12.3(313)=298V2719.9=298V2V2=2.4LAnswer:
See below ~
Explanation:
Q1
Given :
V₁ = 2.3LT₁ = 25°C = 298 KT₂ = 40°C = 313 KUnknown :
V₂Formula :
V₁/T₁ = V₂/T₂ (Charles Law)Solution :
2.3/298 = V₂/313V₂ = 313/298 x 2.3V₂ = 1.05 x 2.3V₂ = 2.42 LFinal Answer :
2.42 LQ2
Given :
P₁ = 1.01 atmV₁ = 6 LV₂ = 3 LUnknown :
V₂Formula :
P₁V₁ = P₂V₂Solution :
1.01 x 6 = P₂ x 3P₂ = 1.01 x 2P₂ = 2.02 atmFinal Answer :
2.02 atm
What is the molarity of Na, SO, if you have 5 mol in 2.5 L?
Thermal energy is another name for–
A. sound energy
B. light energy
C. heat energy
D. mechanical energy.
Explanation:
heat energy is another name for thermal energy
Gatorade
Which of the following is NOT a unit used to measure gas pressure? *
O liters (L)
Omillimeters of mercury (mmHg)
Oatmospheres (atm)
Okilopascals (kPa)
Answer:
liter
Explanation:
liter is the unit of liquid
Find the empirical formula of a compound containing 26.56% potassium, 34.51% chromium, and the remainder oxygen.
Answer:
K₂Cr₂O₇
Explanation:
Finding % of O
% O = 100% - % K - % Cr% O = 100% - 26.56% - 34.51%% O = 73.44% - 34.51%% O = 38.93%Steps
Change % of each element into grams.Convert grams of each element into moles by dividing grams by molar mass.Divide all moles by the smallest number of moles.If the moles are all whole numbers, then you’re done and that’s your empirical formula.If not, multiply all moles by number such that everything is a whole number.Solving
We have 26.56g of K, 34.51g of Cr, and 39.93g of O
Moles of K, n(K) = 26.56/39.0983 = 0.68 molesMoles of Cr, n(Cr) = 34.51/51.9961 = 0.66 molesMoles of O, n(O) = 38.93/15.9994 = 2.43 molesK = 0.68/0.66 ≈ 1 x 2 = 2Cr = 0.66/0.66 = 1 x 2 = 2O = 2.43/0.66 = 3.5 x 2 = 7The empirical formula is K₂Cr₂O₇
Which process is necessary for the formation of igneous rocks?
(A) erosion (C) magma solidification
(B) deposition (D) metamorphism
Answer:
C - magma solidification
Explanation:
Igneous rock is created through heating and cooling of magma (lava).
As hot, molten rock rises to the surface, it undergoes changes in temperature and pressure that cause it to cool, solidify, and crystallize.
47. Which of the following statements about the
bonds in the reactants and products is most
accurate?
(A) The sum of the bond enthalpies of the bonds
in the reactant is greater than the sum of the
bond enthalpies of the bonds in the
products.
(B) The sum of the bond enthalpies of the bonds
in the reactant is less than the sum of the
bond enthalpies of the bonds in the
products.
(C) The length of the bond between carbon
and oxygen in CH3OH is shorter than the
length of the bond between carbon and
oxygen in CO.
(D) All of the bonds in the reactant and products
are polar.
Answer:
a
Explanation: because the sum of the bond enthalpies of the bond in the reactant is greater than the sum.
What dynasty came after China's Five Dynasties and Ten Kingdoms?
Answer:
The Five Dynasties and Ten Kingdoms (907-960) is a period of great division in Chinese history, and is also the collective name for the Five Dynasties and the Ten Kingdoms.
The Five Dynasties refer to the five regimes located in the Central Plains that were successively replaced after the fall of the Tang Dynasty, namely Later Liang, Later Tang, Later Jin, Later Han and Later Zhou. At the end of the Tang Dynasty, the Five Dynasties and the beginning of the Northern Song Dynasty, there were many separatist regimes outside the Central Plains, among which more than ten separatist regimes such as the former Shu, the latter Shu, and the Northern Han were collectively referred to as the Ten Kingdoms.
Explanation:
Answer:
Mongol Yuan dynasty.
Explanation:
Jenny tells her teacher that most liquids expand when they freeze into solids because the particles in the liquid gain energy and move farther apart. Is she correct why or why not
Jenny tells her teacher that most liquids expand when they freeze into solids because the particles in the liquid gain energy is False.
What is Freezing?This is the type of matter change which is characterized by a liquid turning into a solid.
The particles lose energy and the molecules move closer to each other which is why False was chosen.
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What type of reaction is the following?
H₂O ---> H₂ + O
[tex] \boxed{ \frak{Answer }}[/tex]
It's decomposition reaction.
[tex] \sf{Explanation}[/tex]
In decomposition reaction, a compound breaks into simpler form on heating.As, we can see in the above reaction, [tex] H_{2} O[/tex] is broken down into [tex] H_{2} [/tex] and [tex] O_{2} [/tex].
Hence it is a decomposition reaction.[tex] \boxed{ \frak{Be \: Brainly}}[/tex]
[tex] \boxed{ \frak{Keep \: Learning}}[/tex]
How many milliliters of a 12% (v/v) propyl alcohol solution would you need to obtain 7.5 mL of propyl alcohol? Answer to the tenth
[tex]\tt \dfrac{7.5}{12}\times 100=62.5~ml[/tex]
Heat flows–
A. from high places to low place.
B. from colder places to hotter places.
C. from hotter places to colder places.
D. from low places to high places
Answer:
A. from high places to low places
What is an average? What is the formula to calculate an average? science
Answer:
A average is a number expressing the central or typical value in a set of data. add up all the numbers, then divide by how many numbers there are.
Explanation:
4. The half-life of F-20 is 11.0 s. If a sample initially
contains 5.00 g of F-20, how much F-20 remains after
44.0 s
The amount of the F–20 that will remain after 44 s given the data from the question is 0.3125 g
Data obtained from the question Half-life (t½) = 11 sOriginal amount (N₀) = 5 gTime (t) = 44 sAmount remaining (N) = ?How to determine the number of half-lives Half-life (t½) = 11 sTime (t) = 44 sNumber of half-lives (n) =?
n = t / t½
n = 44 / 11
n = 4
How to determine the amount remaining Original amount (N₀) = 5 gNumber of half-lives (n) = 4Amount remaining (N) = ?N = N₀ / 2ⁿ
N = 5 / 2⁴
N = 5 / 16
N = 0.3125 g
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How many grams of Copper are in 500grams of Cu2CO3?
Answer:
Explanation:
Calculate the molar mass of Cu2CO3 in grams per mole or search for a chemical formula or substance. Molecular weight of Cu2CO3. ... Copper: Cu: 63.546: 2: 67.927%: Carbon: C: 12.0107: 1: ... it tells us how many grams …
current is created by the movement of what subatomic particle?
Answer:
I believe the answer is electrons.
Explanation:
Protons can't move and neurons don't have a charge so it would be electrons.
What is the percent composition of Cesium and Fluorine in CsF?
Select the correct answer.
Which is an intermediate in this reaction mechanism:
step 1: H202 + 1 - H20 + O
step 2: H202 + or - H20 + O2+1"
A. H202
B.I-
C.OI-
D.O2
Answer:
I^-
Explanation:
Usually in these reactions we use palladium (pd) or platinum (pt) or halogens
Intermediate is the elements which runs the reaction.
Here iodine is doing that.
so option B is correct
differentiate between positive and negative deviation ~
[tex] \\ [/tex]
ty! :)
Answer:
positive deviation from raoults law means when the vapour pressure is higher than the solution is expected to exhibit e.g of one is the mixture of acetone and ethanol
negative deviation means that it is opposed to the total vapour pressure of the solution
Which of the following quantities represents the greatest volume?
A) 300 microliters
B) 3.0x106 nanoliters
C) 3.0x104 deciliters
D) 3.0x10-12 kiloliters
E) 3.0 milliliters
The lowest and largest conversion factors are nanoliters and kiloliters, respectively. Among all the given options, the correct option is option C.
What is volume?A liquid, solid, or gas's volume is the amount of three-dimensional space it occupies. Although there are many different units that may be used to indicate volume, the most common ones are liters, m³, gallons, milliliters, teaspoons, as well as ounces.
Gases have a volume equal to the internal capacity of the container since they fill their containers to the brim. Containers with a designated volume or one whose interior form is known are frequently used to measure liquids. Measuring cups, graded cylinders, flasks, as well as beakers are a few examples of the tools used to quantify liquid volume. 3.0x10⁻¹²kiloliters represents the greatest volume.
Therefore, the correct option is option C.
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Clarence grew three bearded iris plants. He put one in direct sunlight, one in
the shade, and one in the dark. The plant in the sun grew the most quickly and
looked the healthiest. Clarence concluded that bearded iris plants grow best
in the sun.
How would you evaluate Clarence's conclusion?
A. His conclusion is valid because his experiment included a control.
B. His conclusion is flawed because it is based on the appearance of the plants
C. His conclusion is flawed because he did not perform enough trails
D. His conclusion is bailed because he tested only one variable
How many grams of rubidium are in 2.39 x 10^24 atoms of rubidium?
Avogadro's number is the number of the particles in a mole of a substance. There are 339 grams of (Rb) rubidium in the sample.
What are atoms?Atoms are the fundamental of the matter that is unsplittable into fine particles.
We know, that 1 mole = 6.022 x 10²³ atoms
So, moles in 2.39 x 10²⁴ atoms will be calculated and converted into mass by using the molar mass of the substance.
2.39 x 10²⁴ × (1 ÷ 6.022 x 10²³) × 85.468 = 339 g Rb
Therefore, 339 g Rb is present in the sample.
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Which one of the following statements is NOT
applicable to molecular solids?
1. Molecular solids are usually excellent conductors of electric current.
2. Molecular solids have relatively low melting points.
3. Molecular solids are soft compared to covalent solids.
Answer:
1. Molecular solids are usually excellent conductors of electric current.
Explanation:
Molecular solids are actually insulators (prevent electricity).
10. Halothane is a popular inhalation anesthetic. It contains 12.15% carbon, 28.86%
fluorine. .506% hydrogen, 40.5% bromine, and 17.97% chlorine. What is the
empirical formula for this ssubstance?
Answer:
Halothane is a popular inhalation anesthetic. It contains 12.15% carbon, 28.86% fluorine, .506% hydrogen, 40.5% bromine, and 17.97% chlorine.
Explanation:
How much of a 14.0 M HNO3 solution should you use to make 840.0 mL of a 0.300 M HNO3 HNO3 solution?
39200 mL of a 14.0 M [tex]HNO_3[/tex] solution should you use to make 840.0 mL of a 0.300 M [tex]HNO_3[/tex] solution.
What are moles?The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilograms of carbon 12; its symbol is “mol”.
Solution:
[tex]M_1V_1 = M_2V_2[/tex]
In this case, [tex]M_1[/tex] = 840.0 mL, [tex]V_1[/tex]= 14.0 M , [tex]M_2[/tex]= 0.300 M
Substituting the value in the equation:
[tex]V_2[/tex] = [tex]\frac{840.0 X 14.0}{0.300}[/tex]
= 39200 mL
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Which statements describe a mixture? Choose all correct answers. In a mixture, the properties of every substance change. A mixture can be separated by a filter. A mixture produces a completely new substance. In a mixture, molecules can mix, but do not change completely. A mixture can be separated only by chemical means. In a mixture, no chemical changes take place.
a mixture can be separated by a filter