Explanation:
2HCl+2Zn----> 2ZnCl+H2
Explanation:
HCL + Zn= zncl2 + H2
plz mark my answer as brainlist if you find it useful.
What is the freezing point of a solution of 498mL of water (solute) dissolved in 2.50 L of ethanol (solvent), C2H5OH? The density of C2H5OH is 0.789g/cm3. (Remember that water has a density of 1.0 g/cm3.)
Answer:
Freezing T° of solution is -142.4°C
Explanation:
This excersise is about colligative properties, in this case freezing point depression,
ΔT = Kf . m . i
Where ΔT = Freezing T° of solvent - Freezing T° of solution
Kf = Cryoscopic constant
m = mol/kg (molality)
i = Number of ions dissolved.
Water is not ionic, so i = 1
Let's find out m.
We determine mass of water, by density
498ml . 1 g/mL = 498 g
We convert the mass of water to moles → 498 g . 1mol/18g = 27.6 moles
We determine mass of solvent by density
2500 mL . 0.789 g/mL = 1972.5 g
Notice, we had to convert L to mL to cancel units.
1 cm³ = 1 mL
We convert the mass from g to kg → 1972.5 g . 1kg /1000g = 1.97kg
We determine m = mol/kg → 27.6mol / 1.97kg = 13.9 m
Kf for ethanol is: 1.99 °C/m
Freezing T° for ethanol is: -114.6°C
We replace at formula: - 114.6°C - Freezing T° solution = 1.99 °C/m . 13.9 m . 1
- 114.6°C - Freezing T° solution = 27.8 °C
- Freezing T° solution = 27.8°C + 114.6°C
Freezing T° Solution = - 142.4 °C
Al +CI = Al CI3
how do i solve this
is there a relationship between the relative age of stars in the number/identity of element is found within them
Yes. Stars use fusion to create nuclear energy, which is what makes them "alive". The older they are, the "bigger" the element in them is. Hydrogen turns into Helium, and when hydrogen is used up, the helium starts fusing into bigger elements. it stops at iron however. Once stars start fusing silicon to iron, it is doomed because it takes more energy than it gives off.
Which of the following is a property of a non-metal.
luster
ductile
malleable
does not conduct heat and electricity
Answer:
luster
:/:/:/:/:::/:::
What is the mass of a liquid that has a density of 124 g/mL and takes up a volume of 18 mL. What mass should the liquid have? (round you answer to the nearest hundredth)
Predict: In each "Climate type" box, Highlight the condition you think will lead to the fastest weathering for the given weathering type.
Weathering type
Climate type
Frost wedging
Hot
Cold
Wet
Dry
Clay formation
Hot
Cold
Wet
Dry
Dissolving
Hot
Cold
Wet
Dry
Answer:
Frost Wedging - Hot and dry
Clay Formation - Cold and Wet
Dissolving - Cold, and dry
Explanation:
The frost wedging happen when the climatic condition is hot and dry. The dry weather compensates the heat and the rock wedging happens quickly. For clay formation the weather has to be cold and wet. The cold weather will make the sand indulge with rock particles resulting in the clay formation.
true or false the membrane of rer is continuous with the outer layer of the mithochondrial membrane
Answer:
false
Explanation:
18.The Halogen family of elements all have 7 valence electrons. Which column would they be in?
a.01 (IA)
b.02 (IIA)
c.4 (IVA) or 14
d.7 (VIIA) or 17
what is biopolymer ?
Answer:
Biopolymers are natural polymers produced by the cells of living organisms. Biopolymers consist of monomeric units that are covalently bonded to form larger molecules. There are three main classes of biopolymers, classified according to the monomers used and the structure of the biopolymer formed: polynucleotides, polypeptides, and polysaccharides.
Explanation:
A thermochemical equation indicates the absorption or release of heat in addition to the reactants and products involved in the chemical reaction. The amount of energy available for conversion into heat is represented by a triangle H does this term stand for?
Answer:
A. Enthalpy of the reaction
Explanation:
A Thermochemical equation is a balanced stoichiometric chemical equation that indicates the absorption or release of heat in addition to the reactants and products involved in the chemical reaction. The amount of energy available for conversion into heat is represented by ΔH, a this term which stands for the enthalpy change, ΔH.
The Enthalpy of Reaction or Heat of Reaction is the amount of energy in the form of heat transferred during a chemical reaction that occurs at a constant pressure. It is useful for calculating the amount of energy per mole either released or produced in a reaction, therefore is unit is kJ/mol.
In a reaction where energy is absorbed by the reactants during the formation of products, ΔH is positive. On the other hand, in a reaction where energy is released by the reactants during the formation of products, ΔH is negative.
The enthalpy change, ΔH of reactions are determined experimentally under standard conditions of 1 atm and 25 °C (298.15K). Enthalpy can be measured experimentally through the use of a calorimeter. A calorimeter is an isolated system which has a constant pressure and in which heat loss to the surroundings is minimal.
Question 8
Which one of the following salts does not contain water of crystallisation?
Answer:
pb
Explanation:
dosn't contain water of crystallization
Predict the approximate molecular geometry of a formaldehyde molecule:
Answer:
trigonal planar geometry
Explanation:
The molecule, formaldehyde , has three regions of electron density around the molecule. The carbon atom is the central atom in the molecule of formaldehyde.
Recall that each bond around the central carbon atom in formaldehyde- both single and double are counted as a single region of electron density. Molecules having three regions of electron density around the central atom have a trigonal planar geometry.
What is the VSEPR shape of BHI2?
a.) bent
b.) trigonal planar
c.) trigonal pyramidal
d.) tetrahedral
e.) linear
Answer:
The answer is B
Explanation:
honestly do
Now molecules: Choose... molecules of H 2 + Choose... molecules of O 2 → Choose... molecules of H 2 O
Answer:
2 H2 + 1 O2 → 2 H2O
Explanation:
How many moles of water are contained in 3.58 x 10^24 molecules? 6.022
x 10^23 molecules = 1 mole
O 5.94 moles
0 10.0 moles
0 022 x 10^23 moles
0 3.00 moles
Answer:
Try everything
O 5.94 moles
0 10.0 moles
0 022 x 10^23 moles
0 3.00 moles
Explanation:
how did the periodic table get its name?
a. the periodic table got its name from the way the elements are arranged in periods called groups.
b. the periodic table got its name from the way the elements are arranged in rows which are called periods.
c. the periodic table got its name from the way the elements are arranged in rows which are called periodic groups.
d. the periodic table got its name from the way the elements are arranged in rows which are called groups.
Answer:
no te engiendo mi panahellow
Answer:
b
Explanation:
b. the periodic table got its name from the way the elements are arranged in rows which are called periods.
20 POINTS!!
__________ aid the immune system in mounting attacks against cancer cells by targeting antigens only found on the surface of cancer cells.
A. Monoclonal antibodies
B. Interferons
C. CRISPR
D. Vaccines
E. Interleukins
Answer:
B. Interferon
Explanation:
interferon targets any lingering melanoma cells and prevents them from spreading and growing.
What is the proper name for the chemical formula Cl4O5?
Answer:
Carbon tetraiodide
Explanation:
let me know if it works
Solid sodium combines with solution of magnesium fluoride to form sodium fluoride solution and magnesium metal.
Solid sodium combines with solution of magnesium fluoride to form sodium fluoride solution and magnesium metal is adding hydrochloric acid into form magnesium chloride solution and hydrogen gas. A solution could be copper oxide is combined with solid carbon. This forms copper metal and carbon dioxide gas.
Find the mass of a person walking west at a speed of 0.8 m/s with momentum of 52.0 kg*m/s west.
Answer:
12 preguntas y no te sabes ni una sola valla el mundo se está acabando
Answer:
65 kg
Explanation:
m = p ÷ v
m= 52 ÷ 0.8
m = 65 kg
Which situation is does NOT occur during a chemical reaction?
bonds are formed
bonds are broken
mass is conserved
atoms are destroyed
Thermal expansion occurs when particles of matter move farther apart as temperature increase. True or false ?
Answer:
true
Explanation:
28 grams of Al react with 30 Oxygen gas (O2) to produce Al Oxide (Al2O3). How many grams of Al Oxide will be produced
Answer:
58
Explanation:
Due to conservation of energy, the sum of the reactants = the sum of the products. So 28 + 30 = 58g
BRAINLIEST IF YOU GET IT!! 5 STARS & A THANK YOU!!
Which of the following is a distinguishing difference between rocks and minerals?
A. Minerals are aggregates of different rocks and elements.
B. Minerals have specific chemical compositions, but rocks do not.
C. Crystals are a type of rock and granite is a type of mineral.
D. Minerals are made of rocks combined in different combinations.
Answer:
B.
Explanation:
Minerals are formed due to chemical composition by rocks are pressured into their formed from dirt and naturally hard things.
The statement that represents a distinguishing difference between rocks and minerals is as follows:
Minerals have specific chemical compositions, but rocks do not.Thus, the correct option for this question is B.
What is the difference between rocks and minerals?A mineral is a naturally occurring substance with distinctive chemical and physical properties, composition, and atomic structure. Rocks are generally made up of two or more minerals, mixed up through geological processes.
Minerals are definitely formed due to chemical composition by rocks being pressured into their formation from dirt and naturally hard things. A rock is an inorganic and a solid naturally-formed substance without any chemical composition or atomic structure.
A mineral is also a solid, inorganic, substance as that like a rock which has a definite crystalline structure as well as chemical composition. Rocks form, break down and move through the rock cycle.
Therefore, the correct option for this question is B.
To learn more about the Rock and minerals, refer to the link:
https://brainly.com/question/15844293
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What is the difference between fumarate and fumaric acid?
Answer:
the difference is fumaric acid the carboxylic acid groups are trans (E) and in maleic acid they are cis (Z)
Explanation:
and Fumarate is an intermediate in the citric acid cycle used by cells to produce energy in the form of adenosine triphosphate (ATP) from food
What is the formula for CNHO
Answer:
this is basically structure of iso cyanic acid
which element has a smaller atomic radius than strontium (Sr)?
it is tecnically magnesium,
Answer:
barium is the answer
Can someone help me please. chem.
Answer:
linar
Explanation:
HELP ASAP PLS AHHH ty
Answer: a for the first one , d for the second one, b for the third one.
Explanation:
Answer:
A: Main sequence star.
B: White Dwarf.
C: Black hole.
Explanation:
Brainliest please.
what might be a formula for calculating distance
Answer:
Distance = speed * Time
hope it helps
Answer:
Distance formula (x2 - a1) ° + (y2 - Yı)?
d - d = distance
(x1, Y1) coordinates of the first point
(x2, Y2) = coordinates of the second point