Both trials of 1.2 g and 1.6 g will have the same mass percent of water because the ratio of the salt to the water of hydration is always constant for any hydrated salt.
Water of hydrationFor every hydrated salt, the ratio of the salt to the water of hydration remains constant irrespective of the amount of salt taken for experimental analysis.
For example, assuming the mass percent of water in 10g of a hydrated salt is 40%, if 100g of the same salt is taken, the mass percent will remain 40%.
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Which of the following is a pure substance?
O A. Milk
O B. Salt
O C. Blood
O D. Candy bar
Answer:
A. Milk
Explanation:
Cause is basics. It's proved by scientific I watched on TV and my teacher told me. I am a 100% sure.Go ask to your mother how many litres you drink her milk per day.
Explain ferromagnetism. Include what is happening to the electron in the atoms
In Ferromagnetism, materials are changed into permanent magnets.
What is Ferromagnetism?Ferromagnetism is a process in which specific materials are turned into permanent magnets. The spins of electrons are shifted and electrons become more aligned and sequence with the direction of the field.
So we can conclude that in Ferromagnetism, materials are changed into permanent magnets.
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Al2O3(s)+3CO(g)→2Al(s)+3CO2(g) Express your answer in kilojoules to one decimal place.
Based on the standard heat of formation of aluminium oxide, the heat of the reaction of the decomposition of aluminium oxide is +3339.6 kJ
What is the heat of reaction?The heat or enthalpy of a reaction is the amount of heat evolved or absorbed when reactant molecules when reactants form products.
Considering the given reaction:
2 Al2O3(s) -> 2 Al(s) + 3 O2(g)The heat of formation of aluminum oxide is -1669.8 kJ/mol.
The heat of the reaction of the decomposition of aluminium oxide is calculated as follows:
Heat of reaction = Heat of formation of products - Heat of formation of reactants
Heat of reaction = {3 × ΔHf°O2 (g) + 2 × ΔHf° Al(s)} - 2 × ΔHf° Al2O3 (s)
Since the standard enthalpy of formation,ΔHf°, of an element in its most stable form is equal to zero.
ΔH°rxn = (3 × 0 + 2 × 0) - 2 × -1669.8 kJ/
ΔH°rxn = +3339.6 kJ
Therefore, the heat of the reaction of the decomposition of aluminium oxide is +3339.6 kJ
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A gas mixture contains the following gases with the mole fractions indicated:
water (0.164), hydrogen (0.278), oxygen (0.455), and carbon dioxide (0.101). The
mixture also contains carbon monoxide. What is the mole fraction of carbon
monoxide? PLEASE HELP!
Hi there!
To find the mole fraction for the remaining compound (Carbon monoxide), we must remember that mole fractions add up to ONE.
We can subtract the mole fractions of all of the other gases from one to solve for the mole fraction of carbon monoxide.
1 - 0.164 - 0.278 - 0.455 - 0.101 = 0.002
What is the molarity of a solution formed when you add 200. Ml of water to 50. Ml of 5. 0 m hcl
The molarity of a solution formed when you add 200 mL of water to 50 mL of 5. 0 M HCl is 1.25M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
M1V1 = M2V2
Where;
M1 = molarity of a baseM2 = molarity of acidV1 = volume of baseV2 = volume of acidM1 × 200 = 50 × 5
200M1 = 250
M1 = 250/200
M1 = 1.25M
Therefore, the molarity of a solution formed when you add 200 mL of water to 50 mL of 5. 0 M HCl is 1.25M.
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Name an element in the third period (row) of the periodic table with a total of 4 3p electrons
Answer:
sulfur
Explanation:
sulfur has 4p electrons.
phosphorus has 3p electrons.
The question is asking which one has 4
The element in the third period (row) of the periodic table with a total of 4 3p electrons is sulfur (S).
What is sulfur?Sulfur is a chemical element that is present in the third of the periodic table.
Its atomic number is 16.
The electronic configuration of sulfur is [tex]\rm [Ne]\; 3S_2\; 3P_4[/tex]
So, sulfur contains 4 electrons in its last orbital.
Thus, the element in the third period (row) of the periodic table with a total of 4 3p electrons is sulfur (S).
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Nitrogen is contained in which of the following?
a. adenine.
b. cytosine.
c. guanine.
d. thymine. d. uracil.
Answer:
DNA contains four nitrogen bases: adenine, thiamine, guanine and cytosine. Adenine and thymine pair, and guanine and cytosine pair.
Explanation:
In combination, nitrogen is found in the rain and soil as ammonia and ammonium salts and in seawater as ammonium (NH4+), nitrite (NO2−), and nitrate (NO3−) ions...
Which statement best describes the use of a chemical indicator in a titration? It must be measured to the nearest 0. 01 mL. It must be colored in the acid solution. It must measure pH directly at all pH values. It must change color near the equivalence point.
The statement that best describes the use of a chemical indicator in a titration is it must change color near the equivalence point.
What are indicators?Indicators are those compounds which are used in the titration process to estimate the presence of chemical entities in it.
In the titration process, indicator is added in the titration solution which changes its color when the reaction mixture goes towards the equivalence point and becomes disappear at that point.
Hence option (4) is correct.
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How many more atoms are there in 48g of C compared with 48.6g of Mg? Explain your answer.
Answer:
The number of carbon atoms is twice the number of magnesium atoms
Which units are used for weight? Give the full name, not the abbreviation.
Answer:
Gram, Kilogram, and Tonne
Explanation:
Answer:
The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton. For example, an object with a mass of one kilogram has a weight of about 9.8 newtons on the surface of the Earth, and about one-sixth as much on the Moon.
Explanation:
What increases the rate a solute dissolves in a solvent.
Answer:
Stirring
Explanation:
Stirring a solute into a solvent speeds up the rate of dissolving because it helps distribute the solute particles throughout the solvent. For example, when you add sugar to iced tea and then stir the tea, the sugar will dissolve faster.
Answer:
crushing particles of solute
Explanation:
Consider the equation for the formation of water. 2h2 o2 right arrow. 2h2o what is the theoretical yield of h2o if 130 g of h2o is produced from 18 g of h2 and an excess of o2? 18 g 81 g 130 g 160 g
The theoretical yield is the reaction yield that measures the product of the reaction from the conversion of the limiting reagent. The theoretical yield is 160 gm.
What is mass?Mass or the theoretical yield is the result of the multiplication of mole and the molar mass of the compound.
The reaction between hydrogen and oxygen is shown as,
[tex]\rm 2H_{2} + O_{2} \rightarrow 2H_{2}O[/tex]
Moles of water is calculated as:
[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{18}{2}\\\\&= 9\;\rm moles\end{aligned}[/tex]
The theoretical yield of water is calculated as:
[tex]\begin{aligned}\rm \text{weight of water} &= \rm moles \times molar \; mass\\\\&= 9 \times 18\\\\&= 162 \;\rm gm\end{aligned}[/tex]
Therefore, option D. 160 gm is the theoretical yield of water.
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Why are flood plains desirable farm land in spite of the fact that they are prone to flooding?.
Flood plains are desirable farm land in spite of the fact that they are prone to flooding because of its high fertility.
Why are floodplains desirable farm land?Floodplains are very fertile agricultural areas because the floods carry nutrient-rich silt and sediment and deposited it that plains. Floodplains are flat which make easier farming.
So we can conclude that flood plains are desirable farm land because of its high fertility.
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The periodic table is arranged in order by which classification?.
Answer:
Atomic weight and valence electrons
Explanation:
These variables allow Mendeleev to place each element in a certain row and column. The table comprises 7 rows and 18 columns.
Which shows that friction is undesirable?
a. Pushing furniture
b. Lighting a matchstick
c. Walking on wet floors
d. Approaching a spotlight
C. Walking on wet floors shows that Friction is undesirable
In an exothermic reaction, which condition will be true?
A.) Activation energy will be less than the energy of the reactants.
B.) Activation energy minus energy of the products will be greater than activation energy minus energy of reactants.
C.) Activation energy minus energy of the products will be less than activation energy minus energy of reactants.
D.) Activation energy will be less than the energy of the products.
Activation energy will be less than the energy of the products in an exothermic reaction. Therefore, option (D) is correct.
What is exothermic reaction?In this type of reaction, the energy of the products is lower than the energy of the reactants. As a result, the difference in energy is released as heat or light, which can be detected by measuring the temperature or observing the light emitted during the reaction.
Exothermic reactions occur spontaneously, meaning they do not require an external energy source to start the reaction. Common examples of exothermic reactions include combustion, oxidation, and neutralization. These reactions often involve the formation of stronger bonds between atoms or molecules, which releases energy in the form of heat or light.
Exothermic reactions play an important role in many natural and industrial processes, including respiration, photosynthesis, and the production of electricity in power plants.
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Burning fossil fuels creates the ___________ gas carbon dioxide which increases global temperatures.
Question 4 options:
greenhouse
fossil
inert
poisonous
Answer:
green house gas
Explanation:
Describe how to express the rate of a chemical reaction
Answer: A “rate” is a measure of the speed of any change that occurs within an interval of time In chemistry, reaction rate is expressed as the amount of reactant changing per unit time. Example: 3 moles/year, or 5 grams/second
Explanation: A “rate” is a measure of the speed of any change that occurs within an interval of time In chemistry, reaction rate is expressed as the amount of reactant changing per unit time. Example: 3 moles/year, or 5 grams/second
Answer:
Chemical reaction rates are usually expressed as the concentration of reactant consumed or, the concentration of product formed per unit time.
Explanation:
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zz. Compound A is crystalline, has a high melting point, and is more conductive when dissolved. Compound B is highly conductive and can be hammered into different shapes. Compound
Cis not highly conductive and is a gas. Which of these compounds is covalent?
compound A
compounds
compound
Nane at these compounds is covalent
Answer:
Compound C is covalent.
Explanation:
Among the properties of a covalent compound is that it has poor conductivity and could possibly be a gas at room temperature.
When the carbonator adds CO 2 to the solution, a ________ is added to the reaction, which pushes the reaction in the
________ direction.
a. product, forward
b. product, reverse
c. reactant, forward
d. reactant, reverse
(CO2 is added to H2CO3)
When the product is added to the solution, it will shift the reaction forward.
What is Carbonation?Carbonation is a form of chemical reaction in which carbon dioxide is added to a solution to give carbonates, bicarbonates, and carbonic acid. In chemistry, the term is used in place of carboxylation to form carboxylic acids
When a product is added to a system, the equilibrium will shift to the left, so as to produce more reactants but if the reactants is remove from the system, equilibrium will also be shifted to the left.
Therefore, When the product is added to the solution, it will shift the reaction forward.
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10 A fixed quantity of gas is placed inside a container of fixed volume at a temperature of
27°C. The gas has a pressure, P.
Which expression shows the pressure of the gas at 57°C?
A P2=(27/57) P
B
P2=(57/27) P
P2=(300/330) P
с
D
P2=(330/300) P
A gas has a pressure P at 27 °C. To calculate its pressure at 57°C we use an expression derived from Gay-Lussac's law:
C) P2 = (300/330) P
What does Gay-Lussac's law state?Gay-Lussac's law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas when the volume is kept constant.
Mathematically, it can be written as:
P/T = k
A gas has a pressure P at 27 °C and we want to find the expression to calculate its pressure at 57°C.
Step 1: Convert the temperatures to the Kelvin scale.We do so by summing 273.15.
K = 27 + 273.15 = 300 K
K = 57 + 273.15 = 330 K
Step 2: Apply Gay-Lussac's law.P2/330 = P/300
P2 = (300/330) P
A gas has a pressure P at 27 °C. To calculate its pressure at 57°C we use an expression derived from Gay-Lussac's law:
C) P2 = (300/330) P
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when the concentration of NADH increases while the concentration of NAD+ decreases, will the electrochemical potential increase, decrease, or remain the same
When the concentration of NADH increases while the concentration of NAD+ decreases, the electrochemical potential however will increase
What is electrochemical potential?Electrochemical potential can be defined as a measure of the difference between the average energy of the outermost electrons of the molecule or element in its two valence states.
What is NADP?NADP is a coenzyme and simply has it full meaning as Nicotinamide Adenine Dinucleotide Phosphate
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Zinc reacts with iron (iii) chloride yielding zinc chloride plus iron
Answer:
I don't see a specific question, so I'll make a few comments and hope that answers the reason for the post.
Explanation:
Zinc(Zn) does react with iron chloride, since zinc is a more reactive metal than the iron.
When Zn is introduced to an iron (III) chloride solution, the Zn disoplaces the Fe atom in a displacement reaction.
The chemical equation of the reaction:
Zn + Fe(III)Cl3 → ZnCl3 + Fe
Energy is often realeased in this type of reaction, since the resulting chemical products have a lower energy that the reactants.
There are several metals more reactive than iron. One of the more interesting examples of a highly exothermic reaction with iron chloride (rust) is the reaction of aluminum with iron chloride. `This is highly exothermic and is labelled a thermite reaction. It provides a spectacular flame that is not enough to weld railroad tracks together.
Round the mmHg readings to the nearest whole number. Round the kPa readings to the nearest tenth. Round the atm readings to the nearest hundredth. Convert a pressure of 1.76 atm to _____ torr.
i love jesus and i love my mommy
Based on the graph what is the approximate half-life of the reaction shown below
In a molecule of water (H2O), two hydrogen atoms are each bonded to one oxygen atom. What forms each of the two bonds?
Write balanced chemical equations for dissociation of the following weak acids and identify their conjugate bases: phosphoric acid (H3PO4), formic acid (HCO2H), and boric acid (H3BO3).
The conjugate base of an acid is the negative ion that it forms in solution. The conjugate base of each of the following acids are indicated below;
1) H3PO4(aq) ⇄ H^+(aq) + H2PO4^-(aq)(conjugate base)
2) HCO2H(aq) ⇄ H^+(aq) + HCO2^-(aq) (conjugate base)
3) H3BO3(aq) ⇄ H^+(aq) + H2BO3^- (aq) (conjugate base)
What is a conjugate base?When an acid is dissolved in water it is dissociated into ions. The conugate base of the acid is the negative ion that it forms in solution. Let us now see the conjugate base of each of the ions formed;
1) H3PO4(aq) ⇄ H^+(aq) + H2PO4^-(aq)(conjugate base)
2) HCO2H(aq) ⇄ H^+(aq) + HCO2^-(aq) (conjugate base)
3) H3BO3(aq) ⇄ H^+(aq) + H2BO3^- (aq) (conjugate base)
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What is the percent composition of hydrogen in beryllium hydride, if 69.6g of beryllium with 15.6g of hydrogen to produce 85.2g of BeH2?
The percent composition of hydrogen is 18.3%.
What is percent composition?
The term percent composition refers to the percentage of a particular component in a compound. It is contained as the ratio of the mass of that component to the total mass multiplied by 100.
From the law of conservation of mass, total mass of beryllium hydride(BeH2) = 85.2 g
Mass of hydrogen = 15.6 g
Percent composition of hydrogen = 15.6 g/ 85.2 g × 100/1 = 18.3%
Do the halogens tend to gain or lose electrons in chemical reactions? how many?
Explanation:
Halogens tend to gain one electron so that they can get a full outer level and be stable.
Isotopes are:
A. found in the nuclear reactions in
stars but not on Earth.
B. are only theoretical.
C. found in nature.
D. only formed in laboratories.
Isotopes are only formed in laboratories and is denoted as option D.
What are Isotopes?This refers to an element which has the same atomic number but different mass number due to difference in number of neutrons.
They are also usually formed in laboratories through series of chemical reactions.
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