Answer:
Approximately [tex]83\%[/tex].
Explanation:
How many moles of [tex]\mathrm{CO_2}[/tex] gas are released?
The volume of each mole of of an ideal gas is approximately [tex]\rm 24\;L[/tex] under room temperature and pressure (r.t.p, [tex]\rm 20\;^{\circ}C[/tex], [tex]\rm 1\; \right. atm[/tex].) That's the same as [tex]\rm 24,000\;cm^{2}[/tex].
Assume that [tex]\mathrm{CO_2}[/tex] acts like an ideal gas.
[tex]\displaystyle n(\mathrm{CO_2}) = \rm \frac{100\; cm^{3}}{24,000\; cm^{3}} \approx 0.00416667\; mol[/tex].
[tex]\rm HCl[/tex] is in excess. How many moles of [tex]\mathrm{CaCO_3}[/tex] formula units will produce that [tex]\rm 0.00416667\; mol[/tex] of [tex]\mathrm{CO_2}[/tex]?
Consider the ratio between the coefficient of [tex]\mathrm{CaCO_3}[/tex] and that of [tex]\mathrm{CO_2}[/tex].
[tex]\displaystyle \frac{n(\mathrm{CaCO_3})}{n(\mathrm{CO_2})}=1[/tex].
In other words,
[tex]\displaystyle n(\mathrm{CaCO_3})= n(\mathrm{CO_2})\cdot \frac{n(\mathrm{CaCO_3})}{n(\mathrm{CO_2})} = \rm 0.00416667\; mol[/tex].
What's the mass of that many [tex]\mathrm{CaCO_3}[/tex]?
Relative atomic mass data from a modern periodic table:
Ca: 40.078;C: 12.011;O: 15.999.Formula mass of [tex]\mathrm{CaCO_3}[/tex]:
[tex]M(\mathrm{CaCO_3}) = 40.078+12.011 + 3\times 15.999 =\rm 100.086\; g\cdot mol^{-1}[/tex].
Mass of that [tex]\rm 0.00416667\; mol[/tex] of [tex]\mathrm{CaCO_3}[/tex]:
[tex]m = n \cdot M = \rm 0.00416667 \times 100.086 = 0.417025\; g[/tex].
Percentage mass of [tex]\mathrm{CaCO_3}[/tex] in this sample of chalk:
[tex]\displaystyle \frac{\text{Mass of }\mathrm{CaCO_3}}{\text{Mass of Chalk}} \times 100\%= \rm \frac{0.417025\; g}{0.5\; g} \times 100\%\approx 83\%[/tex].
Four different objects are placed on a number line at 0. The chart describes the motion of each object. Using the information in the chart, the distance and displacement of each object can be determined. Which object has a distance that is three times as great as its displacement? W X Y Z
Answer: I think that the answer is Z.
The equation below shows the reaction of zinc with hydrochloric acid (HCl).
Zn (s) + 2 HCl (aq) —> ZnCl2 (aq) + H2 (g)
What will happen if the concentration of HCl is decreased?
A. More ZnCl2 will be produced.
B. The reaction rate will slow down.
C. The hydrochloric acid will become more acidic.
D. The reaction will produce water instead of hydrogen gas.
Answer:
B.
Explanation:
If the concentration of acid is decreased the reaction rate will slow down as the hydrogen ion concentration will decrease.
Answer:
B. The reaction rate will slow down.
Explanation:
As concentration increases, rate of the reaction will increase. When there are more particles present in a system, more collision will take place.
As collision increases, rate of the reaction will increase. Concentration makes the molecules to come closer together thus leading to more collisions.
Rate of the reaction is directly proportional to the reactant collisions.
Orientation of the molecule and molecule possessing enough energy will lead to increased number of collisions thereby increasing the rate of the reaction .
So, Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate
During a combustion reaction, 5.00 grams of oxygen reacted with 5.00 grams of CH4.
What is the amount of the leftover reactant?
4.00 grams of methane
3.75 grams of methane
2.25 grams of oxygen
1.75 grams of oxygen
Answer:
3.75 grams of methane
Explanation:
Given parameters:
Mass of oxygen gas = 5g
Mass of CH₄ = 5g
Unknown parameters:
Amount of excess reactant = ?
Solution
In order to find the amount of leftover reactant we need to know the reactant that is in excess and in limited supply. The amount of reactant in short supply will determine the extent of the reaction.
Now, we need to write the balanced reaction equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
We first find the number of moles of the reactants.
Number of moles of methane = [tex]\frac{mass}{molar mass}[/tex]
Number of moles of methane = [tex]\frac{5}{16}[/tex] = 0.3125mole
Number of moles of oxygen = [tex]\frac{5}{32}[/tex] = 0.156mole
From the equation:
1 mole of methane reacts with 2 moles of oxygen gas
x moles of methane reacts with 0.156moles of oxygen gas
2x = 0.156
x = 0.078moles
We see that the methane is in excess and oxygen gas is in short supply in the reaction.
The amount of excess methane = 0.3125 - 0.078 = 0.2345moles
Now we convert it to mass:
Mass = number of moles x molar mass = 0.2345 x 16 = 3.75grams
Answer:
3.75 grams of methane
Explanation:
Got it right on the exam
Which property of an element determines its position in the activity series?
Atomic mass
Atomic radius
Reactivity
Solubility in water
Answer:
Reactivity.
Explanation:
The activity series is used to determine, for example, if a single displacement reaction occurs, and that depends on the activity of the ion of an element.
Hope this helped!
Answer: Option (c) is the correct answer.
Explanation:
An activity series is defined as the series that shows metals arranged in decreasing order according to their reactivity.
Atomic mass is the sum of total number of protons and neutrons present in an atom.
Atomic radius is defined as the distance from the center of the nucleus to the outer most shell. Larger is the size of an atom, greater will be its atomic radius.
Reactivity is the ability of an atom to readily combine or react with a substance in order to gain stability.
Solubility is water means whether a compound or molecule dissociate into ions or not if dissolved in water.
Therefore, we can conclude that reactivity is the property of an element determines its position in the activity series.
Why Can alloys not be described using chemical formulas?
A) alloys are mixtures with undefined proportions
B) alloys are mixtures instead of compounds
C) alloys have a network structure called a crystal lattice
D) Alloys have a structure that lacks covalent bonds
Answer:
A) Alloys are mixtures with undefined proportions.
Explanation:
Alloys are different mixtures or different materials with no exact portion size.
brainliest? :)
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How many moles are in 64 grams of methane, CH4?
A. 4
B. 32
C. 64
D. 13
Answer:
A. 4.
Explanation:
We can use the relation:no. of moles (n) = mass/molar mass.
mass = 64.0 g, molar mass = 16.0 g/mol.
∴ no. of moles (n) = mass/molar mass = (64.0 g)/(16.0 g/mol) = 4 mol.
Final answer:
To find the number of moles of methane in 64 grams, divide the mass by the molar mass of methane, which is 16.05 g/mol. The result is approximately 4 moles of CH₄. Option A
Explanation:
To calculate the number of moles in 64 grams of methane (CH₄), we need to use the molar mass of methane as a conversion factor. Methane has a molar mass of approximately 16.05 g/mol (carbon is 12.01 g/mol and hydrogen is approximately 1.008 g/mol × 4). Therefore, the calculation is as follows:
Number of moles of CH₄ = Mass of CH₄ ÷ Molar mass of CH₄
Number of moles of CH₄ = 64 g ÷ 16.05 g/mol
Number of moles of CH₎ = 3.9875 mol
When rounded to the nearest whole number, the number of moles of methane in 64 grams is approximately 4.
balance the following chemical equations:
Ca(OH)2 + HNO3 -----> Ca(NO3)2 + H2O
CH4 + O2 ------> CO2 + H2O
Answer:
Explanation
=============
One
=============
Ca(OH)2 + 2HNO3 -----> Ca(NO3)2 + H2O
Focus on the NO3. This is an odd problem and you usually do not focus on the complex ion. But this one works easiest if you do.
The problem now is going to be the oxygens. There are 2 with the Calcium and only 1 free one going to the water. (The NO3 has been taken care of in the last step).
Ca(OH)2 + 2HNO3 -----> Ca(NO3)2 + 2H2O
Count the atoms. I think this equation is balanced.
atom Left Right Result
Ca 1 1 Balanced
O 8 8 Balanced
H 2 + 2 2*2 Balanced
N 2 2 Balanced
===========
Two
===========
CH4 + O2====> CO2 + H2O
Start with the hydrogens.
The right side requires a 2
CH4 + O2 ===> CO2 + 2H2O
Now look at the oxygens. There are 4 on the right. and only 2 on the left. You need to multiply O2 by 2
CH4 + 2O2 ===> CO2 + 2H2O
Each side has 1 Carbon 4 hydrogens and 4 oxygens. The equation is balanced.
How many bonds are present in Cl20?
a. 2
b. 4
c. 1
d. 3
Answer:
A. 2 bonds
Explanation:
If you see a charch of ci20 it would easily show the answer.
Which of the following would increase the rate of this chemical reaction N2(g) + 3H2(g) ---> 2NH3(g)
I Reduce the temperature
II Decrease the volume
III Introduce a catalyst
I only
I and II
II and III
III only
Answer:
Decrease in temperature
Addition of catalyst (Fe)
Answer:
III only
Explanation:
The rate of a chemical reaction (when reactant particles are gases) is increased by the following factors
increase in temperatureincrease in pressureaddition of catalystThe only correct option from the question is III
A catalyst increases the rate of chemical reaction by reducing the activation energy of the reaction. Activation energy is the minimum amount of energy required for a reaction to occur. So, when the activation energy is lowered, the time required to complete a reaction reduces, hence the rate of reaction increases.
What does the field of chemistry study?
Answer:
Chemistry is the study of matter and energy and the interactions between them. You could use chemistry in most fields, but it's commonly seen in the sciences and in medicine.Chemists, physicists, biologists, and engineers study chemistry.
Explanation:
Answer:
Chemistry is a branch of study which deals with matter.
Explanation:
All matter is made up of atoms which undergoes chemical reactions.
Chemistry is the study which deals with these chemical reactions.
The physical and chemical properties gives us the information about the nature of the substance.
We get to know the composition and structure of various compounds present in nature.
Analytical chemistry, biochemistry, inorganic chemistry, organic chemistry, physical chemistry, and biophysical chemistry are some of the important branches of chemistry.
Analytical chemistry uses qualitative and quantitative observation to identify and measure the physical and chemical properties of substances
Physical chemistry combines chemistry with physics. Physical chemists study how matter and energy interact.
Organic chemistry is known as the “Chemistry of Life” because all of the molecules that make up living tissue have carbon as part of their makeup.
Inorganic chemistry studies materials such as metals and gases that do not have carbon as part of their makeup.
Biochemistry is the study of chemical processes that occur within living organisms.
Electrolysis hydrocloric acid and both of the electrode uses a platinium electrode... what will happen to both of the electrode?
Answer:
Hydrogen gas is evolved at the cathode and chlorine gas at the anode.
Explanation:
The solution will ionise. Hydrogen ions, H+, will migrate to the negative cathode ( where the current leaves the solution and chloride ions Cl- will migrate the the positive anode.
In the electrolysis of hydrochloric acid using platinum electrodes, the anode will release chlorine gas, and the cathode will release hydrogen gas.
Explanation:In the electrolysis of hydrochloric acid, both electrodes (anode and cathode) will be made of platinum. When current is passed through the hydrochloric acid solution, at the anode, chloride ions (Cl-) will be oxidized to form chlorine gas (Cl2), and at the cathode, hydrogen ions (H+) will be reduced to form hydrogen gas (H2). Therefore, the platinum anode will release chlorine gas, and the platinum cathode will release hydrogen gas.
Which of the following is the best definition of a scientific theory? A predicted experimental outcome A mathematical model (an equation) A prediction of how a natural phenomenon will behave A well tested explanation of a natural phenomenon
Answer:
A well tested explanation of a natural phenomenon
Explanation:
A scientific theory is an explanation of a natural phenomenon which has been drawn from a well tested observation.
Theories are products of repeated scientific experiments. When a hypothesis otherwise known as a "scientific guess" survives a lot of scrutiny, we can elevate it to the status of a theory. Most theories starts off from simple observations. These observations can further spark series of experiments in such a field and a scientific guess proposed. Further testing and experimenting would now lead to a theory.
HELPPPPP MEEEE WITH SCIENCE
. Identify four common properties of covalent compounds.
Four common properties of covalent compounds:
1. Low melting points and boiling points.
2. Lower enthalpies of fusion and vaporization.
3. More flammable.
2. Doesn't conduct electricity.
Which of the following is not an intensive physical property of matter?
temperature
mass
density
concentration
Answer:
Concentration
Explanation:
Amount of substance concentration often called simply concentration, is a quantitative measure of the number of atom s per unit volume in a sample of a matter.
i need help like asap
Answer: different charges but same mass
protons and neutrons determine the mass (electrons are too light)
since atom q and atom r are of the same proton and neutron , they are of the same mass
protons and electrons determine the charge
a proton has a 1+ and electron has a 1- charge
atom q has no charge, the protons and electrons cancel each other out
atom r has a 1- charge as there is one more electron than proton.
Answer : Thecorrect option is, They have different charges and same masses.
Explanation :
As we know that an atom is the smallest unit of a matter that consist of three subatomic particles which are electrons, protons and neutrons.
The protons and the neutrons are located inside the nucleus or center of the nucleus where the mass of the an atom is concentrated and the electrons are located around the nucleus.
The protons are positively charged, the electrons are negatively charged and the neutrons are neutral that means it has no charge.
Atomic number : It is defined as the number of protons or number of electrons.
Atomic number = number of protons = number of electrons
Mass number : It is defined as the sum of number of protons and number of neutrons.
Number of neutrons = Mass number - Number of protons
From the given data we conclude that:
Atom Q has 11 number of protons, electrons and 12 number of neutrons.
Atom R has 11 number of protons, 10 number of electrons and 12 number of neutrons.
Atom Q has no charge but Atom R has (+1) charge due to loss of 1 electron. That means, they have different charges.
Mass of Atom Q = Number of neutrons + Number of protons = 11 + 12 = 23
Mass of Atom R = Number of neutrons + Number of protons = 11 + 12 = 23
Thus, the correct option is, They have different charges and same masses.
How many electrons does a single hydrogen gain or lose in the following reaction? H 2 + O 2 → H 2 O
A. Gain 2
B. Lose 1
C. Gain 1
D. No change
Answer:
option B. Lose 1.Explanation:
To determine the number of electrons that a single hydrogen gains or loses you need to realize that the chemical reaction is an oxidation-reduction (redox) reaction and state the changes in the oxidation states.
The substance that gains electrons is being reduced, reducing its oxidation number, and the substance that lose electrons is being oxidized, increasing its oxidation state.
1) State the oxidation state of hydrogen atoms in the rectant side:
H₂: the oxidation state of any element in its atomic or molecular form is zero. That is indicated as a superscript to the right of the chemical symbol: H₂⁰2) State the oxidation state of the hydrogen atoms in the product side:
H₂O: the rule says that the oxidation state of oxygen, when combined with other elements, except in the case of peroxides, is -2.Hence, in order to the molecule H₂O be neutral, the total charge contributed by the two atoms of hydrogen must be + 2: +2 - 2 = 0.
Since there are two hydrogen atoms, each contributes +2 / 2 = +1 charge.
3) Conclusion:
Every atom of hydrogen changes from a 0 oxidation number to a +1 oxidation number, which, in turn, means that every hydrogen atom loses one electron.
Thus, the answer is, the option B. Lose 1.
Answer:
Lose 1
Explanation:
Answer via Educere/ Founder's Education
In a chemical reaction, 18 grams of hydrochloric acid reacts with 20 grams of sodium hydroxide to produce sodium chloride and water. Which statement is correct?
The mass of water formed is 38 grams.
The mass of sodium chloride formed is 38 grams.
The total mass of sodium chloride and water formed is greater than 35 grams.
The total mass of sodium chloride and water formed is less than 35 grams.
Answer:is it correct
Explanation:
Answer:
C. The total mass of sodium chloride and water formed is greater than 35 grams.
Explanation:
I took the test and got it right
An atom of boron has an atomic number of 5 and an atomic mass of 11. The atom contains
5 protons, 6 electrons, and 5 neutrons.
11 protons, 11 electrons, and 5 neutrons.
5 protons, 5 electrons, and 6 neutrons.
11 protons, 6 electrons, and 6 neutrons.
Answer:
It is C.
Explanation:
The atomic mass = number of protons + number of neutrons
= 5 + 6 = 11. The number of protons = the number of electrons.
Final answer:
A boron atom with an atomic number of 5 and an atomic mass of 11 contains 5 protons, 5 electrons, and 6 neutrons.
Explanation:
An atom of boron has an atomic number of 5 and an atomic mass of 11. The atomic number tells us that there are five protons in the nucleus of a boron atom. Given that the atomic mass is the sum of the protons and neutrons, and the atomic mass of boron is 11, we can deduce that there must be 6 neutrons (11 - 5 = 6). Boron atoms also have an equal number of electrons as protons when they are neutral. Therefore, the correct composition of a neutral boron atom is 5 protons, 5 electrons, and 6 neutrons.
Boron has two naturally occurring isotopes, boron-10 and boron-11, which differ only in their number of neutrons. Isotopes are variants of the same element that have the same number of protons but a different number of neutrons. Boron's average atomic mass is calculated based on the relative abundance of its isotopes: 20% boron-10 (5 protons and 5 neutrons) and 80% boron-11 (5 protons and 6 neutrons).
1. How does wind help in the following activities?
(a) Flying a kite
(b) Moving a sailboat
You are conducting an experiment on how increasing pressure during a deep sea dive affects gases in the blood. Which unit would be appropriate for your measurements?
Answer:
Pascals
Explanation:
Pascals are the unit for pressure
Answer: Pascal
Explanation: Pascal(Pa) is the unit of pressure according to Internataional Standard of units.
One Pascal is equivalent to the one newton(N) of force applied over an area of 1 metre squared(m2).
Thus when we are conducting an experiment on how increasing pressure during a deep sea dive affects gases in the blood, then Pascal is the most appropiate unit of measurement.
Which statement best explains the symbol [NaCl]? moles of water per liter of NaCl moles of water per liter of solution moles of NaCl per liter of solution moles of NaCl per liter of water
Answer:
moles of NaCl per liter of solution.
Explanation:
[NaCl] is an expression of the concentration of NaCl.If the concentration is the molarity;Molarity can be defined as the no. of moles of solute dissolved per a 1.0 L of the solution.
For [NaCl] is a symbol for: moles of NaCl per liter of solution.
Answer: moles of [tex]NaCl[/tex] per liter of solution
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
[tex]Molarity=\frac{n}{V_s}[/tex]
where,
n= moles of solute
[tex]V_s[/tex] = volume of solution in L
Square brackets represents the concentration of a substance i.e. amount of solute dissolved per liter of the solution.
Thus [tex]NaCl[/tex] represents moles of [tex]NaCl[/tex] per liter of solution.
A double replacement reaction can be best described as a reaction in which
Suppose you wish to apply SSA to a triangle, in order to find an angle
measure. Also suppose the given side lengths of a triangle are equal. Which
of the following statements is true?
O
A. There will be infinitely many solutions for the angle.
O
B. There will be two solutions for the angle.
O
C. There will be zero solutions for the angle.
O
D. There will be one solution for the angle.
SUBMIT
There will be only one solution for the angle. So, the correct option is D.
What is meant by SSA triangle ?SSA or side-side-angle, triangle is a combination of triangles, where the length of two of the sides and the non-included angle between the two sides is known.
Here,
In SSA triangle, length of two sides and one angle will be known.
It is given that the length of the two sides is equal. Therefore the angles opposite to these sides will also be equal. Let the angle be x.
If the sides are equal, according to trigonometry, the non-included angle will be equal to 45°.
So, we can write that,
The sum of the angles,
45° + x + x = 180°
2x = 135
Therefore, x = 67.5°
Hence,
There will be only one solution for the angle. So, the correct option is D.
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A double replacement reaction is a reaction in which one element replaces a similar element within a compound.
True
False
6.75 L of carbon dioxide gas are stored at a pressure of 175 atm. If the temperature and number of gas particles do not change, what is the new volume when the pressure is decreased to 110 atm?
4.24 L
10.7 L
0.0931 L
1.59 L
Please answer ASAP!!
The volume of carbon dioxide gas changes from 6.75 L to b) 10.7 L when the pressure is decreased from 175 atm to 110 atm, as per Boyle's Law.
The student asks how the volume of carbon dioxide gas changes when the pressure is decreased from 175 atm to 110 atm, assuming constant temperature and number of gas particles. This is a classic application of Boyle's Law in the study of gas laws, which can be expressed in the equation P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume respectively. Given the initial conditions (P1 = 175 atm and V1 = 6.75 L) and final pressure (P2 = 110 atm), we can solve for the new volume V2.
Using Boyle's Law:
P1V1 = P2V2175 atm * 6.75 L = 110 atm * V2V2 = (175 atm * 6.75 L) / 110 atmV2 = 10.7 LTherefore, the new volume is b) 10.7 L when the pressure is decreased to 110 atm.
How many grams of chromium are needed to react with an excess of CuSO4 to produce 27.0g Cu
14.7 g of chromium are need to produce 27.0 g of copper in the reaction:
2 Cr + 3 CuSO4 → Cr2(SO4)3 + 3 Cu. In this reaction, chromium is the limiting reactant and CuSO4 is the excess reactant.
Further Explanation:
The problem given is an example of a stoichiometry problem. Stoichiometry involves the determination of the amounts of products formed and amount of reactants consumed in a chemical reaction. It uses the ratio of the reactants and products given by the balanced chemical equation.
Limiting reactant is the reactant that determines how much of the product(s) will be obtained. In this problem, chromium is the limiting reactant.
To solve the amount of limiting reactant we use several steps:
Calculate the moles of product (Cu) formed.Use the stoichiometric ratio of the product (Cu) and the limiting reactant (Cr) to get the number of moles of Cr used up.Convert the moles of Cr used up to mass (in grams).STEP 1: Convert mass to moles using the equation below:
[tex]no. \ of \ moles \ = given \ mass \ (\frac{1 \ mole}{molar \ mass})[/tex]
For this problem,
[tex]no. \ of \ moles \ Cu \ = 27.0 \ g \ Cu \ (\frac{1 \ mole \ Cu}{ 63.55 \ g}) \\\boxed {no. \ of \ moles \ Cu \ = 0.4249}[/tex]
STEP 2: Calculate the number of moles of Cr used up using the stoichiometric ratio from the balanced equation: 3 moles Cu: 2 moles Cr
[tex]moles \ of \ Cr \ = given \ moles \ Cu (\frac{2 \ mol \ Cr}{3 \ mol \ Cu})\\moles \ of \ Cr \ = \ 0.4249\ mol\ Cu (\frac{2 \ mol \ Cr}{3 \ mol \ Cu})\\ \\\boxed {moles \ of \ Cr \ = \ 0.2832 }[/tex]
STEP 3: Convert moles of Cr to mass (in grams).
[tex]mass \ = given \ moles \ (\frac{molar \ mass}{1 \ mole})\\[/tex]
To get the mass of Cr,
[tex]mass \ of \ Cr \ = 0.2832 \ mol \ (\frac{52.00 \ g}{1 \ mol})\\\boxed {mass \ of \ Cr \ = 14.7 \ g}[/tex]
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The mass of chromium, Cr needed to react with excess CuSO₄ to produce 27 g of Cu is 14.7 g
Balanced equation2Cr + 3CuSO₄ → Cr₂(SO₄)₃ + 3Cu
Molar mass of Cu = 52 g/mole
Mass of Cr from the balanced equation = 2 × 52 = 104 g
Molar mass of Cu = 63.5 g/mole
Mass of Cu from the balanced equation = 3 × 63.5 = 190.5 g
SUMMARY
From the balanced equation above,
190.5 g of Cu were produced from 104 g of Cr
How to determine the mass of Cr neededFrom the balanced equation above,
190.5 g of Cu were produced from 104 g of Cr
Therefore,
27 g of Cu will be produce by = (27 × 104) / 190.5 = 14.7 g of Cr
Thus, 14.7 g of Cr is needed for the reaction
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2. You are making jelly. After mixing the ingredients you pour the liquid in a bowl, co
tightly, and place it in the fridge. In a short time it becomes a solid. The mass of the
jelly is
a. Greater than the mass of the liquid.
b. The same as the mass of the liquid.
c. Less than the mass of the liquid.
d. There is no way to tell.
b.
Same because, mass doesn’t count liquid or solid
The mass of the jelly is the same as the mass of the liquid as mass is always conserved when the state of matter changes according to law of conservation of mass.
What is law of conservation of mass?Law of conservation of mass states that the mass is neither created nor destroyed rather it is always restored during any chemical or physical change.During a chemical change, the mass of reactants is equal to the mass of products.It implies to the fact that mass does not change with time.
In the process of making jelly only physical changes are involved as there is no chemical change taking place during the process and hence the mass remains the same irrespective of the state of matter.
The law was discovered by Antoine Lavoisier in the year 1789. Concept of conservation of mass is widely used in chemistry,fluid dynamics and mechanics.
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Which of the following elements is a nonmetal? a. selenium (Se) b. yttrium (Y) c. barium (Ba) d. calcium (Ca) e. All of these are metals.
Answer:
The correct answer option is a. Selenium (Se).
Explanation:
From the given answer options, Selenium (Se) is the only element which is a non metal.
It has the atomic number 34 with atomic weight 78.96. It is a member of the sulfur group of the non metallic elements and falls in period 4 of the Periodic table.
Selenium has non metallic properties which are intermediate between the elements that lie above and below it in the Periodic table.
Answer:
a. Selenium
Explanation:
Selenium is a non metal but though rarely, it is considered to be a metalloid.
(Metalloids are elements intermediate between metals and nonmetals and are known to have partly metallic and partly non metallic properties.)
Selenium is in group 16 of the periodic table below sulphur and has average properties of the group elements above and below it in the periodic table..
How are polyatomic ions named when found in ionic compounds?
a. their endings are changed to -ide
b. their endings are changed to -ite
c. their names are the same as the polyatomic's name
d. they do not appear in ionic names
Answer:
the answer is letter d
Polyatomic ions are named similarly to monatomic ions in ionic compounds. No changes are made to the ending of the polyatomic ion. The name of the compound is formed by combining the cation and the anion.
Explanation:Compounds containing polyatomic ions are named similarly to those containing only monatomic ions, except there is no need to change to an -ide ending, since the suffix is already present in the name of the anion. For example, if we have the compound NaNO3, it is named as sodium nitrate. Similarly, CaCO3 is named as calcium carbonate, and NH4Cl is named as ammonium chloride.
In ionic compounds, polyatomic ions are named similarly to monatomic ions. The ending of the polyatomic ion remains unchanged. The name of the compound is formed by combining the cation and the anion.
For example, in the compound sodium nitrate (NaNO3), the polyatomic ion is nitrate (NO3-). The name of the compound is formed by combining the cation (sodium, Na+) and the anion (nitrate, NO3-).
Similarly, in calcium carbonate (CaCO3), the polyatomic ion is carbonate (CO3^2-). The name of the compound is formed by combining the cation (calcium, Ca^2+) and the anion (carbonate, CO3^2-).
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What is the name of this hydrocarbon?
A. 1-methylbutane
B. 2-methylbutane
C. 2-methylpropane
D. 3-methylpropane
Answer:
C. 2-methylpropane
Explanation:
There are rules guiding the naming of hydrocarbons. Some of the rules are:
1.) The longest continuous chain is the parent chain:
The longest chain here is made up of 3-carbon atoms which is a propane compound
2.)The carbon atoms are numbered in the parent chain to indicate where branching or substitution takes place.
Here, it is in the second carbon atom in propane.
The branched group is methyl- which is a methane molecule that has lost a hydrogen atom.
This makes ths name of the compound to be:
2-methylpropane
Answer: C.
Explanation: