[tex]1) \text{ } \text{CaF}_{2}\\\\2) \text{ } \text{H}_{2}\text{S}\\\\3) \text{ } \text{NH}_{3}\\\\4) \text{ } \text{CCl}_{4}\\\\5) \text{ } \text{Na}_{2}\text{O}[/tex]
Which is the correctly balanced chemical equation for the reaction of KOH and H₂SO4?
OKOH H₂SO4 →K*+50²-
2KOH+H₂SO4 → K₂SO4
2KOH+H₂SO4 → K₂SO4+2H₂O
4
OKOH H₂SO4 → K₂SO4 →H₂O
Answer:
2KOH + H2SO4 > K2SO4 + 2H2O
Explanation:
firstly the order speaks, you can't have something like OKOH so the other two is eliminated. Then check if the remaining reactions balance
The correctly balanced chemical equation for the reaction of KOH and H₂SO₄ is 2 KOH+H₂SO₄ → K₂SO₄+2 H₂O.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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What do scientists and engineers have in common?
Answer:
Engineers and scientists both use methods of science and facts.
Explanation:
They often use Math and computer in calculations.
Answer:
Scientists and engineers both use the facts and methods of science, and both often use MATH and COMPUTERS in their work.
Explanation:
What does a high number on the pH scale say about a solution?
OA. The solution is basic.
OB. The solution is hot.
C. The solution is neutral.
OD. The solution is acidic.
Explanation:
A is cortect answer dsfa
An atom is neutral because it has the same number of electrons as it has???????????????????????????????????????????????????????????
Answer:
protons
Explanation:
the protons and electrons of an element are the same amount however the neutrons are a different amount
Ripening is a _______________ and spoiling is a ______________.
A. Chemical reaction, chemical reaction.
B. Physical reaction, chemical reaction.
C. Physical reaction, physical reaction.
D. Chemical reaction, physical reaction.
Answer:
A
Explanation:
The answer to this question is A. Both ripening and spoiling are chemical reactions.
Spoiling is a chemical reaction because spoiled food has bad smell and taste and it changes colour too.
Ripening of fruits is a chemical change. For example the colour could change as well as the texture.
Answer:
option a) chemical reaction, chemical reaction.
Explanation:
Changes in which new substances with different properties are formed are called chemical changes. Cooking of food, burning of substances are chemical changes as entirely new substances are formed. Burning of a candle wax releases carbon dioxide and water vapour (new substances). in here ripening and spoiling is a change that cannot be reversed which makes it a chemical change.
You might also want to challenge other commonly accepted green ideas or the impact of the various green activities . For example , what is the relative impact of these green measures ? What mass of carbon do these various common activities use up ?
1. Washing clothes at 300 degrees instead of 400 .
2. Shutting your computer down every night .
3. Using low - energy light bulbs instead of regular light bulbs ..
4. Switching off television instead of leaving it on standby .
5. Boiling only 1 cup of water at a time , instead of a whole kettle .
2)A complete desktop uses an average of 200 Watt hours (Wh). This is the sum of the average consumption per hour of the computer itself (171 W), the internet modem (10 W), the printer (5 W) and the loudspeakers (20 W). Assuming that a computer is on for eight hours a day, the annual consumption comes to 600 kWh. That corresponds to CO2 emissions of about 175 kg per year, i.e. 1.75 % of the average annual emission of a Belgian.
According to the phase diagram for H₂O, what happens to the phases of
water at 0°C as the pressure is increased from 0 atm to 10 atm?
Answer:
"A", "water changes from a gas to a solid to a liquid", according to this phase diagram, at at 0°C, as pressure is increased from 0atm to 10atm.
Explanation:
The question asks what happens at 0°C, as pressure is increased from 0atm to 10atm.
According to the question, the temperature is held constant. The pressure changes. In the phase diagram, we find the temperature 0°C on the horizontal axis, and all points where the temperature are 0°C are along that vertical line.
Since the pressure starts at 0atm and increases to 10atm, we start at the bottom, and move upward along that line, to see what phases of matter the substance changes to.
At the bottom, it is initially in a "gas" phase. As it moves up, it transitions to a "solid" phase. Later, as it continues moving up, it changes again into a "liquid" phase.
Thus, the answer would be "A", "water changes from a gas to a solid to a liquid", according to this phase diagram, at at 0°C, as pressure is increased from 0atm to 10atm.
How many calories are in a
banana containing 410 kJ of
energy?
[? ] cal
Number of calories that are in a banana containing 410 kJ of energy are 97619.04 Calories.
What is Energy?The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.
Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.
Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.
1 calorie of energy has 0.0042 Kilo Joules.
97619.04 Calories of energy will be present in 410 KJ.
Therefore, Number of calories that are in a banana containing 410 kJ of energy are 97619.04 Calories.
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15. What will be the volume of a given mass of oxygen at 250C if it occupies 100cm3 at 150C.? (Pressure remain constant)
Answer:
V₂ = 167 cm₃
Explanation:
Because you are only dealing with volume and temperature, you can use Charles' Law to find the missing value. This formula looks like this:
V₁ / T₁ = V₂ / T₂
In this formula, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You have been given values for all of the variables except for final volume. Therefore, by plugging these values into the formula, you can simplify to find your answer.
V₁ = 100 cm³ T₁ = 150 °C
V₂ = ? T₂ = 250 °C
V₁ / T₁ = V₂ / T₂ <---- Charles' Law formula
(100 cm³) / (150 °C) = V₂ / (250 °C) <---- Insert values
(0.667) = V₂ / (250 °C) <---- Simplify left side
(0.667) x (250 °C) = V₂ <---- Rearrange
167 = V₂ <---- Simplify left side
What is the complete ionic equation for NaOH(aq) + HCl(aq) → H₂O()) + NaCl(aq)?
Answer:
OH-(aq)+H+(aq)->H2O(l)
Answer is shown in photo.
Explanation :
APEX
a sample of helium gas has a volume of 1.00 l. what is the final volume if both the pressure and kelvin temperature each double?
Since the helium gas has a volume of 1.00 L, the final volume of the helium gas is 1.00 L
To find the volume, we need to know the general gas law.
What is the general gas law?The general gas law is given by P₁V₁/T₁ = P₂V₂/T₂ where
P₁ = initial pressure of gas, V₁ = initial volume of gas, T₁ = initial temperature of gas in Kelvin, P₂ = final pressure of gas, V₁ = final volume of gas, andT₁ = final temperature of gas in KelvinFinal volume of helium gasSo, making V₂ subject of the formula, we have
V₂ = P₁V₁T₂/T₁P₂
Since the sample of helium gas has a volume of 1.00 L and both the pressure and kelvin temperature each double, we need to find its final volume.
So,
P₂ = 2P₁, T₂ = 2T₁ and V₁ = 1.00 LSo, substituting the values of the variables into the equation, we have
V₂ = P₁V₁T₂/T₁P₂
V₂ = P₁V₁ × 2T₁/T₁ × 2P₁
V₂ = V₁
V₂ = 1.00 L
So, the final volume of the helium gas is 1.00 L
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If a gas occupies 1532.7 mL at standard temperature, what volume does it occupy at 49.4 ºC if the pressure remains constant?
a. 1810
b. 1300
c. 276
d. 3.80e5
Answer:
a. 1810mL
Explanation:
When conditions for a gas change under constant pressure (and the number of molecules doesn't change), it follows Charles' Law:
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex] where the temperatures must be measured in Kelvin
To convert from Celsius to Kelvin, add 273, or use the equation: [tex]T_C+273=T_K[/tex]
For this problem, one must also recall that standard temperature is 0°C (or 273K).
So, [tex]T_1 = 273[K][/tex], and [tex]T_2 = (49.4+273)[K]=322.4[K][/tex].
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
[tex]\dfrac{(1532.7[mL])}{(273[K])}=\dfrac{V_2}{(322.4[K])}[/tex]
[tex]\dfrac{(1532.7[mL])}{(273[K\!\!\!\!\!{-}])}(322.4[K\!\!\!\!\!{-}] )=\dfrac{V_2}{(322.4[K]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}(322.4[K]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})[/tex]
[tex]1810.04571428[mL]=V_2[/tex]
Adjusting for significant figures, this gives [tex]V_2=1810[mL][/tex]
the pressure of a gas depends on the ____ and ____ of the gas.
Answer:
Temperature and Volume
Explanation:
PV = n R T
P = n R T / V pressure depends on the temperature and volume
The pressure of a gas depends on the temperature and volume of the gas.
Ideal gas equationPV = nRT
Where
P is the pressureV is the volumen is the number of moleR is the gas constantT is the temperatureFrom the equation given above, we obtained the following:
PV = nRT
Divide both sides by V
P = nRT / V
R is constant and n = 1
P = T / V
Thus, we can see that the pressure (P) is dependent on the temperature (T) and the volume (V)
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what are the benefits of organic farming
When molten magma rises to the surface it cools ________, forming ________ igneous rocks.
A. slowly, extrusive
B. slowly, intrusive
C. rapidly, intrusive
D. rapidly, extrusive
Answer:
B)Slowly, intrusive
In desperate need of help!!!!!!!
Answer:
The answer will be false.
Explanation:
because it is not balanced.
We know the sun is primarily made from hydrogen and helium on the basis of its:
We know the sun is primarily made from hydrogen and helium on the basis of its spectrum.
What is Sun's spectrum?Sun's spectrum refers to the light of the Sun whose wavelength spectra can be used to identify atomic composition.
Thus spectrum (Sun's spectrum) initiates with the red light (700 nm) and ends with the blue (380 nm).
In conclusion, we know the sun is primarily made from hydrogen and helium on the basis of its spectrum.
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Atoms and the chemical bonds that connect them cannot be observed with your eyes, so it is necessary to use a
a. microscope
b. theory
c. model
d. both (b) and (c)
Answer: d. both (b) and (c)
Explanation:
Atoms are too small to be seen on microscopes, so we model them based on theories.
2. Metals react with water and release hydrogen gas. Explain why non-metals do not release hydrogen gas when reacted with water.
Answer:
Its because non-metals are unable to break the bond between the H and O ion and cannot reduce hydrogen by donating electrons
The empirical formula for a compound shows the symbols of the elements with subscripts indicating the
Select one:
A) actual numbers of atoms in a molecule.
B)numbers of moles of the compound in 100 grams.
C)smallest whole-number ratio of atoms.
D) atomic masses of each element
Answer:
smallest whole number ratios of atoms
Hydrogen and Oxygen will have ______ properties after they bond to become water.
A. only the dominant element’s
B. both of their original
C. the same
D. completely new
Ethanoic acid reacts with ethanol to form an ester and water. How many moles of ethanoic acid are required to produce 0.5 mol of the ester? (A) 0.05 (B) 0.5 (C) 1 (D) 2
0.5 moles of ethanoic acid are required to produce 0.5 mol of the ester , Option B is the right answer.
What is esterification reaction ?The reaction in which a carboxylic acid combine with an alcohol to form ester and water is called esterification reaction.
It is given in the question that
Ethanoic acid reacts with ethanol to form an ester and water
C₂H₅OH + CH₃COOH → CH₃COOH + H₂O
The moles of ethanoic acid required to produce 0.5 mole of ester.
In the following reaction it can be seen that the mole fraction of ethanoic acid to ester is 1: 1
Therefore 0.5 mole of ethanoic acid will be required to produce 0.5 mol of ester.
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How many hydrogen bonds will be found within an alpha helix that is 18 amino acids long?.
An alpha helix which is 18 amino acids long will have 12 hydrogen bonds.
What is alpha helix (α-helix) ?The alpha helix (α-helix) is a common in the secondary structure of proteins and is a right hand-helix conformation in which every backbone N−H group hydrogen bonds to the backbone C=O. group of the amino acid located four residues earlier along the protein sequence.
The alpha helix is stabilized by hydrogen bonds (shown as dashed lines) from the carbonyl oxygen of one amino acid to the amino group of a second amino acid.
Because the amino acids connected by each hydrogen bond are four apart in the primary sequence, these main chain hydrogen bonds are called "n to n+4.
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How does separating CHEMICALS through DISTILLATION harm the environment ?
Explain in your own words
Explanation:
Distillation is the separation of mixture of two liquids which differ in boiling point. Through Distillation vapour that is formed spread thoroughly in our environment
How to convert °c 40 to °f
Answer:
104 f
Explanation:
multiply 40 by 1.8 and then add 32
What does a standard enthalpy change mean?
Standard enthalpy change refers to a change in the amount of energy in a reaction that occurs under standard conditions.
What is standard enthalpy change?It is a property that measures the change in the amount of energy in a reaction involving the formation of substances from pure elements.
Such a reaction must happen under standard conditions which include 1-atmosphere pressure and 298.15 K temperature.
It is designated by ΔH°.
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Which of the following species of fish have cartilaginous skeletons?
Answer:
sharks have cartilaginous skeletons
Explanation:
Sharks are an example
explain the bonding nature in NaCl with diagram
Explanation:
NaCl is the compound that we want to know the Bonding structure of
in chemistry when a metal (Na) combines with a non metal (Cl) it is know as an ionic compounds
the type of bonding in ionic compounds is an ionic bond
What is the equilibrium expression for:
fe3o4(s) + 4h2(g) <=> 3fe(s) + 4h2o(g)
kc =
a)[fe]3 [h2o]4 / [fe3o4] [h2]4
b)[fe3o4] [h2]4 / [fe]3 [h2o]4
c)[h2o]4 / [h2]4
d)[fe] [h2o] / [fe3o4] [h2]
Answer:
c
Explanation:
in kc we only consider gases and aquas not solids and liquids
How many molecules of SF6
are in 25.0 g SF6?
[ ? ]×10⁰²] molecules SF6
SF₆
Molar mass: 146.06 g/mol
mole = 25 : 146.06 = 0.171
molecules:
=0.171 x 6.02 x 10²³
=1.03 x 10²³
