Hey There!
At neutralisation moles of H⁺ from HCl = moles of OH⁻ from Ca(OH)2 so :
0.204 * 42.8 / 1000 => 0.0087312 moles
Moles of Ca(OH)2 :
2 HCl + Ca(OH)2 = CaCl2 + 2 H2O
0.0087312 / 2 => 0.0043656 moles ( since each Ca(OH)2 ives 2 OH⁻ ions )
Therefore:
Molar mass Ca(OH)2 = 74.1 g/mol
mass = moles of Ca(OH)2 * molar mass
mass = 0.0043656 * 74.1
mass = 0.32 g of Ca(OH)2
Hope that helps!
Which is a raw material necessary for photosythisies.
water and carbon dioxide
Hello can somone help me ?
Copper has an atomic number of 29.
That means that there are 29 protons in the nucleus of each copper atom. That's what the atomic number is; the number of protons in an atom of a certain element.
if one copper atom contains 29 protons, how many ELECTIONS are there in in 4 atoms of copper?
There are 116 electrons in four atoms of Cu.
A Cu atom contains 29 protons, so it also contains 29 electrons.
[tex]\text{No. of electrons } = \text{ 4 Cu atoms } \times \frac{\text{29 electrons}}{\text{1 Cu atom }} = \text{ 116 electrons }\\[/tex]
Wheen 56j of heat are added to 11g of liquid, its temperature rises from 10.4 degrees celsius to 12 degrees celsius. What is the heat capacity of the liquid
[tex]c = 3.2 \; \text{J} \cdot \text{kg}^{-1} \cdot \text{K}^{-1}[/tex]
Energy change [tex]Q = 56 \; \text{J}[/tex]Mass being heated [tex]m = 11 \; \text{g}[/tex]Temperature change [tex]\Delta T = 12 - 10.4 = 1.6\;^{\text{o}}\text{C}[/tex] which is the same as [tex]1.6 \;\text{K}[/tex].Heat capacity measures the energy required to raise the temperature of a unit mass of a substance by a unit degree. Therefore
[tex]c = Q / (m \cdot \Delta T) = 56/(11 \times (12 - 10.4)) = 3.2 \; \text{J} \cdot \text{kg}^{-1} \cdot \text{K}^{-1}[/tex]
Answer : The heat capacity of liquid will be, [tex]3.18J/g^oC[/tex]
Explanation :
Formula used :
[tex]Q=m\times c\times \Delta T\\\\Q=m\times c\times (T_2-T_1)[/tex]
where,
Q = heat absorb = 56 J
m = mass of liquid = 11 g
c = specific heat of liquid = ?
[tex]\Delta T[/tex] = change in temperature
[tex]T_1[/tex] = initial temperature = [tex]10.4^oC[/tex]
[tex]T_2[/tex] = final temperature = [tex]12^oC[/tex]
Now put all the given value in the above formula, we get:
[tex]56J=11g\times c\times (12-10.4)^oC[/tex]
[tex]c=3.18J/g^oC[/tex]
Therefore, the heat capacity of liquid will be, [tex]3.18J/g^oC[/tex]
What element is most likely to form a diatomic molecule?
A.
Cr
B.
K
C.
Br
D.
Ga
Which characteristics make Mercury different from Earth? Check all that apply. Rings no moon slow revolution hot surface temperatures atmosphere of carbon dioxide
Mercury is different from the Earth for the following reasons:
Mercury has no moon and hot surface temperatures.
Mercury is the smallest planet and the first planet from the sun. Mercury has no atmosphere. The surface temperature of Mercury is incredibly hot, the side of the planet facing the sun has a temperature of 800 degrees F.
Mercury and the earth are the planets of the solar system. Mercury has no moon and has a hot surface temperature. Thus, options b and d are correct.
What is a planet?A planet is a celestial body that revolves around the sun and rotates on its axis in its orbitals. They are different from fixed stars like the sun and moon in having movements. Mercury is the first and the closest planet to the sun.
Being closest to the sun it has more surface temperature than earth and is very small. It lacks an atmosphere as compared to earth and has no natural satellite like the moon that revolves around it.
Therefore, mercury lacks a moon and has a high surface temperature.
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An isotope of mercury has 80 protons and 120 neutrons. What is the mass number of this isotope.
The mass number of an isotope is calculated by adding the number of protons and neutrons. In this case, an isotope of mercury has a mass number of 200 (80 protons + 120 neutrons).
Explanation:The subject of your question is an isotope of mercury, which according to the information you provided, has 80 protons and 120 neutrons. In terms of nuclear structure, an isotope's mass number is the sum of its protons and neutrons. As such, if we add the number of protons (80) to the number of neutrons (120), we find that this isotope of mercury has a mass number of 200.
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Select all that apply to physical and chemical properties. The various components of a mixture do not combine chemically. Chemical properties can only be observed during a chemical reaction. The rusting of iron is a chemical reaction. Melting and boiling points are physical properties. Mass and volume are chemical properties.
Explanation:
A property that does no change the chemical composition of a substance are known as physical properties.
For example, mass, volume, size etc are all physical properties.
Whereas a property that changes the chemical composition of a substance are known as chemical properties.
For example, reactivity, toxicity etc are all chemical properties.
Therefore, identifying the given statements as follows.
The various components of a mixture do not combine chemically - physical property.Chemical properties can only be observed during a chemical reaction - chemical property.The rusting of iron is a chemical reaction - chemical property.Melting and boiling points are physical properties - physical property.Answer:
The various components of a mixture do not combine chemically - physical property.
Chemical properties can only be observed during a chemical reaction - chemical property.
The rusting of iron is a chemical reaction - chemical property.
Melting and boiling points are physical properties - physical property.
Explanation:
For the reaction C3H8 + O2 CO2 + H2O, match the proper coefficient to the chemical substance it goes with for a balanced reaction. A. 1 CO2 B. 5 O2 C. 3 C3H8 D. 4 H2O
Answer:
1: C3H8
5: O2
3: CO2
4: H2O
Explanation:
The balanced equation for the given reaction is C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] → 3CO[tex]_2[/tex]+4H[tex]_2[/tex]O. In other words, both mass and charge on the both side of the reaction are balanced.
What is balanced equation ?A balanced equation indeed a chemical reaction equation in which the overall charge and the amount of atoms for every element inside the reaction are the same for both the products and reactants. In other words, both mass and charge on the both side of the reaction are balanced.
An imbalanced chemical equation describes the products and reactants of a chemical reaction however does not include the quantities needed to meet mass conservation. The balanced equation for the given reaction is C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] → 3CO[tex]_2[/tex]+4H[tex]_2[/tex]O.
Therefore, the balanced equation for the given reaction is C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] → 3CO[tex]_2[/tex]+4H[tex]_2[/tex]O.
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A certain compound is made up of one carbon (c) atom, two fluorine (f) atoms, and one oxygen (o) atom. What is the chemical formula of this compound?
The chemical formula is CF₂O.
Answer:
The chemical formula is [tex]CF_2O[/tex]
Explanation:
To determine how the molecule will be conformed you need to have in mind the valence number of each element present:
F= -1 O= -2 C= +4Now, as the only one positive, the C will be the central atom with a doble bond to the O and a single bond to each F.
In that way all atoms completed the octet and achive stability
As you pass a magnet over a blackish-yellow powder on a glass plate, black particles separate from the powder and become attached to the magnet. After a few passes of the magnet over the powder nothing but a yellow powder remains in the glass plate. The original blackish-yellow powder was:
AS given that we have started with a solid powder on a glass plate which appears to be blackish yellow, on passing magnet the black particles separated.
so the black particles are magentic in nature. however the yellow portion of powder is not magnetic or diamagnetic
so its clear that we are able to separate the black and yellow portions by simple physical methods.
If we are able to separate any two substances by simple physical methods then it means that the powder is a mixture and not a compount
How can affluence help us to solve environmental problems?
3. Classify each of the following materials as a pure substance or mixture. If it is a pure substance, indicate if it is an element or a compound. If it is a mixture, indicate if it is a homogeneous mixture or heterogeneous. (2 points each)
Questions
1.
The copper in a copper wire
2.
Gatorade
3.
Chocolate chip ice cream
4.
Sugar (C12H22O11)
5.
Glitter nail polish
6.
Diamond (C)
7.
Salt (NaCl)
8.
Air
9.
Helium gas
10.
Carbon dioxide gas
11.
Coffee
12.
Caffeine (C8H10N4O2)
13.
Tomato soup
14.
Chicken noodle soup
15.
Brass
16.
Pure water
17.
Pure iron
18.
Sweat
19.
Baking soda (NaHCO3)
Classify each of the following materials as a pure substance or mixture. If it is a pure substance, indicate if it is an element or a compound. If it is a mixture, indicate if it is a homogeneous mixture or heterogeneous. (2 points each)
Questions
1.
The copper in a copper wire pure
2.
Gatorade heterogeneous
3.
Chocolate chip ice cream heterogeneous
4.
Sugar (C12H22O11) pure
5.
Glitter nail polish heterogeneous
6.
Diamond (C) pure
7.
Salt (NaCl) pure
8.
Air homo
9.
Helium gas pure
10.
Carbon dioxide gas pure
11.
Coffee depends on being black and unsaturated
12.
Caffeine (C8H10N4O2) pure
13.
Tomato soup heterogeneous
14.
Chicken noodle soup heterogeneous
15.
Brass homo
16.
Pure water pure
17.
Pure iron pure
18.
Sweat homo
19.
Baking soda (NaHCO3) pure
Final answer:
Detailed classification of substances as pure substances or mixtures, elements or compounds, and homogeneous or heterogeneous mixtures.
Explanation:
A pure substance either consists of a single type of atom, an element, or of molecules made from atoms of two or more types bound together, known as compounds. Mixtures can be either homogeneous, where the composition is consistent throughout, or heterogeneous, where the substances that make up the mixture are not evenly distributed. The items can be classified as -
1. The copper in a copper wire: Pure substance - Element
2. Gatorade: Mixture - Homogeneous
3. Chocolate chip ice cream: Mixture - Heterogeneous
4. Sugar (C12H22O11): Pure substance - Compound
5. Glitter nail polish: Mixture - Heterogeneous
6. Diamond (C): Pure substance - Element
7. Salt (NaCl): Pure substance - Compound
8. Air: Mixture - Homogeneous
9. Helium gas: Pure substance - Element
10. Carbon dioxide gas: Pure substance - Compound
11. Coffee: Mixture - Homogeneous
12. Caffeine (C8H10N4O2): Pure substance - Compound
13. Tomato soup: Mixture - Homogeneous
14. Chicken noodle soup: Mixture - Heterogeneous
15. Brass: Mixture - Homogeneous
16. Pure water: Pure substance - Compound
17. Pure iron: Pure substance - Element
18. Sweat: Mixture - Homogeneous
19. Baking soda (NaHCO3): Pure substance - Compound
WILL MARK BRAINLIEST!!!
Which of the following is the electron configuration of an electrically neutral alkaline earth metal
A. 1s2 2s1
B. 1s2 2s2 2p2
C. 1s2 2s2 2p6 3s1
D. 1s2 2s2 2p6 3s2 3p6 4s2
I feel like the answer is D, but I’m not sure.
A) 1s2 2s1
The alkali metals have one lone outer S electron, because of this we can clearly see that the answer is 1s2 2s1
Answer:
1s2 2s2 2p6 3s2 3p6 4s2
how are ionic bonds formed? a. by the disintegration of one or more electronsb. by the sharing of one or more electrons between two atomsc. by the transfer of one or more electrons from one atom to anotherd. by the disintegration of one or more protons
The correct answer is: by the transfer of one or more electrons from one atom to another.
Which antibody does the body release when it identifies a bacterium or virus?
When the body identifies a bacterium or a virus, it releases the antibody ____.
Explanation:
Immunoglobulin M is the first antibody produced on initial exposure to an antigen. It is also known as IgM.
It occurs as a primary response to the antigens against a particular baterium or virus. It is pentavalent in nature and has ten binding sites for antigens.
Therefore, it is concluded that when the body identifies a bacterium or a virus, it releases the antibody IgM.
Answer:
The first immunoglobulin to arrive is M, IgM
Explanation:
Immunoglobulins are the molecules that intervene in defense against microorganisms, foreign cells and against substances that can cause allergies. They are also known as antibodies. IgM is specific and is the first antibody that appears in primary infections, so its value and quantity is very important to diagnose an infection.
Give an example of role of luck in bottenheims research
"You may find what you seek, or you might not" Is an excellent quote that might help.
"You may find what you seek, or you might not" Is an excellent quote that might help.
What is the molarity of 820 ml of kl solution that contains 36.52 g of kl
The formula is molarity (M) = moles / liters
molarity (M) = ?
1/ mass = 36.52 g of KCl (you need to find the mole)
mole = mass / Molar mass
Molar mass of KCl:
K = 39.10 g/mol
Cl = 35.45 g/mol
Add K and Cl together: 39.10 + 35.45 = 74.55 g/mol
mole = 36.52 g of KCl / 74.55 g/mol
mole = 0.489 mol of KCl
2/ Volume = 820 mL ( you need to convert to L)
820 / 1000 = 0.82 L
=> M = mol / L
M = 0.489 mol / 0.82 L
M = 0.59 mol/L
Hope this help!
Answer: 0.27 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{36.52g}{166g/mol}=0.22moles[/tex]
[tex]V_s[/tex] =volume of solution in ml
Molarity =[tex]\frac{0.22\times 1000}{820ml}=0.27M[/tex]
The molarity of the solution is 0.27 M.
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Answer File Below!
Which of these four liquids is a mixture, made up of parts, some of which can be separated by flirtation? a. Salt water b. Skimmed milk c. Orange juice with pulp d. Distilled water
Orange juice with pulp is the correct answer because it is a heterogeneous mixture with suspended particles that can be separated by filtration.
Explanation:The question asks to identify which of the four liquids listed is a mixture that can be separated by filtration. Among the options provided:
Salt water is a homogeneous mixture, known as a solution, where the salt is completely dissolved in the water and cannot be separated by filtration.Skimmed milk is a colloid where the particles are larger than those in a solution but remain dispersed and do not settle, and thus also cannot be easily separated by filtration.Orange juice with pulp is a heterogeneous mixture that has suspended particles (pulp) which can be separated through filtration.Distilled water is not a mixture at all but a pure substance with a uniform and definite compositionTherefore, the liquid that is a mixture and can have some of its parts separated by filtration is orange juice with pulp.
A scientist discovers a new type of polymer. What must be true about this polymer?
A.
It contains carbon atoms arranged in a ring structure.
B.
It has double bonds between all the carbon atoms.
C.
It contains molecules of many different types.
D.
It is made of large molecules with repeating units.
This polymer must D. be made of large molecules with repeating units.
A polymer consists of long chains of smaller repeating units called monomers.
For example, polyethylene consists of long chains of ethylene (CH₂=CH₂) units joined together end to end.
The formula for polyethylene is -CH₂CH₂-(CH₂CH₂)ₙ-CH₂CH₂-, where n is usually a number between 500 and 10 000.
What is the energy of a photon of green light whose frequency is 6.85 X 1014/seC?
I would be very thankful if I can receive the answer fast
Frequency of photon = is 6.85 X 10¹⁴ sec⁻¹
Energy of photon , E = hv
where h is Planck's constant, v is the frequency of photon
E = 6.63 × 10⁻³⁴ J.s x 6.85 X 10¹⁴ s⁻¹
E = 4.54 x 10⁻¹⁹ J
Therefore, the energy of a photon of green light is 4.54 x 10⁻¹⁹ J.
50 points!!! Based on your observations in the virtual lab, fill in the data table below.
Question 2 options:
Separated using a filter; magnetism
Separated using a magnet; malleability
Separated using filtration; conductivity
Separated using a magnet; magnetism
Hi Khal75,
Experiment: How to seperate iron fillings
Iron fillings is a substance that attracts to magnets.
Answer - Separated using a magnet; magnetism
If you move a magnet around different solids with the iron fillings in it, it wil attract the iron to be able to seperate it.
Which of the following acronyms does not represent a managed care plan? a. HMO b. PPO c. POS d. SOR
The answer would be SOR.
A managed care plan is a type of insurance for health and there are three types: HMO; PPO; and POS.
HMO stands for Health Maintenance Organizations. This type of plan pays for the care provided within the network.
PPO stands for Preferred Provider Organizations. Typically, pays bigger if within the network, but also pays out even if care was provided outside the network.
POS stands for Point of Service lets you choose between HMO or PPO for every time you need health services/care.
Answer:
The answer would be SOR
Explanation:
Which of the following correctly explains how air exerts pressure on us?
The molecules in the air located above us are pulled down towards the Earth by gravity, causing a downward pressure on objects below.
The normal force produced by the Earth against our bodies causes the air to be pressurized.
The difference in the amount of air outside and the amount inside of our bodies creates air pressure.
The strength of molecular bonds between air molecules is greater than the strength of bonds between molecules in our bodies, creating pressure.
The correct explanation of how air exerts pressure on us is:
The molecules in the air located above us are pulled down towards the Earth by gravity, causing a downward pressure on objects below.
Numerous molecules that make up air are constantly moving. These air molecules are drawn downward toward the Earth's surface by the gravity of the planet. Because of this, the air above us has a weight that presses down on everything below it, including our bodies. Atmospheric pressure is the name given to this occurrence.
The other possibilities are not accurate ways to explain how air presses on us. The Earth's natural force acting on our bodies does not immediately pressurize the air. Our bodies' internal pressure regulation, not the air's outward pressure, is what determines how much air is present outside and inside of us. Moreover, the strength of the chemical connections that connect air molecules to our body's molecules is not directly relevant to how air pressure is exerted on us.
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If a decrease in temperature accompanies a reaction, what occurred?
Question 1 options:
Energy was released.
Energy was destroyed.
Energy was created.
Energy was absorbed.
If a decrease in temperature accompanies a reaction, Energy was absorbed.
So the forth option is correct option.
Explanation:If decrease in temperature occurs during a reaction, it indicates that the reaction is endothermic reaction.Endothermic process describes the process or reaction in which the system absorbs energy from its surroundings, usually in the form of heat.So energy in form of heat is absorbed.Out of the following, which element has properties of both metal and nonmetal?
A.
Ce
B.
Be
C.
Te
D.
Ne
The atomic mass of 13C is 13.003355. Multiply the atomic mass of 13C by its abundance. Report the number to 8 significant digits.
The abundance of carbon-13 is needed to solve this problem, which involves multiplying the atomic mass of carbon-13 by its abundance. Without knowing the abundance, we can't do this operation.
Explanation:The implicit part of this problem is the information on the abundance of carbon-13 (13C). Unfortunately, without this information, we can't execute this operation. Typically, abundance percentages are given for isotopes while referring to atomic mass or atomic masses in relation to relative abundance. You would multiply the atomic mass of 13C, which is 13.003355, by its abundance (expressed as a decimal and not a percentage) to get the intended result. For instance, if the abundance of carbon-13 was 10%, it would be represented as 0.10, and the multiplication operation would be 13.003355 * 0.10.
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It is difficult to break the ionic bonds in a compound because of the...
A. Good conductivity between ions.
B. Small distance between the ions.
C. Strong attraction between ions.
Ionic compounds are solid at room temperature because they have...
A. High melting points
B. Ion with similar charges
C. No valence electrons
The answer to the first one is C. Strong attraction between ions
The answer to the second one is A. High melting points
Hope this helps :)
Answer: 1) C. Strong attraction between ions.
2) A. High melting points
Explanation: Ionic compounds are formed by combination of positively charged ions called cations formed by less electronegative metals and negatively charged ions called anions formed by more electronegative nonmetals.
The cations and anions with opposite charges are bonded through strong coloumbic forces and thus are difficult to break and have high melting points and thus exist as solids at room temperature.
[tex]Na:11:[Ne]3s^1[/tex]
[tex]Na^+:10:[Ne][/tex]
[tex]Cl:17:[Ne]3s^23p^5[/tex]
[tex]Cl^-:18:[Ne]3s^23p^6[/tex]
[tex]Na^++Cl^-\rightarrow NaCl[/tex]
which of the following is a physical property?
a) letting milk turn sour
b) allowing silver to tarnish
c) burning wood
d) melting ice
plz explain why too so i can actually learn it!!
What reaction type is depicted by the following equation? 2C2H2 + 5O2 4CO2 + 2H2O decomposition combination combustion single-replacement double-replacement
combustion is when you burn something in presence e of oxygen and the products will be mainly the CO2 and H2O
Answer: The given reaction represents a combustion reaction.
Explanation:
Decomposition reaction is defined as the chemical reaction in which a single substance breaks down into two or more simpler substances.
[tex]AB\rightarrow A+B[/tex]
Combination reaction is defined as the reaction in which two or more smaller substances combine to form a single large substance.
[tex]A+B\rightarrow AB[/tex]
Combustion reaction is defined as the reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide and water.
[tex]C_xH_y+O_2\rightarrow CO_2+H_2O[/tex]
A double displacement reaction is defined as the reaction in which exchange of ions takes place.
[tex]AB+CD\rightarrow AD+CB[/tex]
A single displacement reaction is defined as the reaction in which a more reactive element displaces a less reactive element from its chemical reaction. The reactivity of metal is determined by a series known as reactivity series.
[tex]AB+C\rightarrow CB+A[/tex]
Metal C is more reactive than metal A.
For the given chemical reaction:
[tex]2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O[/tex]
This is considered as a combustion reaction because ethene reacts with oxygen gas to produce carbon dioxide and water molecule.