Answer: 0.13 moles
Explanation:
PLEASE HELP ME ANSWER
Answer:
570
Explanation:
a centigram is a gram times 100
So you do 5.7 times 10 and you get 570
Cobalt-62 is a radionuclide with a half life of 1.5 minutes. What fraction of
an initial sample of cobalt-62 will remain after 6 minutes? Explain your
answer.
Answer:
1/16 is the answer.........
What is the mass of .89 moles of calcium chloride, used as an ice-melter
Answer:
98.76 g
Explanation:
Use the formula mass=moles x MM :)
The mass of .89 moles of calcium chloride, used as an ice-melter is 98.76g.
What is mass ?A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics, it was widely considered to be tied to the amount of matter in a physical body.
The amount of matter that makes up every object or body is the greatest way to understand mass. Everything that we can see has mass. Examples of objects with mass include a table, a chair, your bed, a football, a glass, and even air. The mass of a thing determines whether it is light or heavy.
Simply put, mass is a measurement of a body's amount of matter. Matter is everything that has both volume and mass. Although mass cannot be seen, it can be measured or quantified.
mass = moles x MM
= 0.89 × 110. 98 g⋅mol
= 98.76 g
Thus, The mass of .89 moles of calcium chloride, used as an ice-melter is 98.76g.
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What type of reaction has occurred in the following equation? 2 Na3P O4 + 3 CaCl2 → 6 NaCl + Ca3( PO4) 2
Answer:
it's double displacement reaction
Answer:
Double displacement reaction ( Metathesis)
(03.06 LC)
Which of the following which techniques can be used to separate a homogeneous mixture into its component parts?
Apply pressure
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Answer:
Pressure should be used to seperate the mixture.
Explanation:
The technique that can be used to separate a homogeneous mixture into its component parts is by applying pressure. The correct option is A.
What is homogenous mixture?A homogeneous mixture is a mixture of compounds that has been thoroughly blended to the point where individual substances cannot be seen.
Each sample of the mixture will contain the same proportions of each substance. Homogeneous mixtures can consist of solids, liquids, gases, or plasmas.
A heterogeneous mixture is made up of distinct substances or phases.
Applying pressure is one method for separating a homogeneous mixture into its constituent parts.
The most common method for separating homogeneous fluid mixtures is distillation. Separation takes advantage of differences in boiling points or volatility between the components of a mixture.
Thus, the correct option is A.
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Morocco is separated into different territories of land with tribes often fighting for power to this day.
Answer:
umm whats the question??
Explanation:
Please help me fast, I will give brainliest if correct!
Answer:
C. 24 mol
Explanation:
To say it quickly, 6 moles of C3H8 times 4 moles of HCl is 24. 32 moles of Cl2 times 4/4 moles HCl is 32. Therefore 24 is the correct answer.
Why is Cesium more reactive than Lithium??? Please help
Answer: Cesium is more reactive toward water than lithium because the ionization energy decreases down the group reactivity increases down the group.
Explanation: Please mark me as brainliest and i hope that helped!
How many moles of hydrogen gas(H2) are needed to react with 15 moles of chlorine gas
Answer:
15 moles of hydrogen gas are needed to react with 15 moles of chlorine gas.
Explanation:
The balanced reaction is:
H₂ (g) + Cl₂ (g) → 2 HCl (g)
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of the compounds participate in the reaction:
H₂: 1 moleCl₂: 1 moleHCl: 2 molesThen you can apply the following rule of three: If 1 mole of Cl₂ reacts with 1 mole of H₂, 15 moles of Cl₂ with how many moles of H₂ does it react?
[tex]moles of H_{2} =\frac{15 moles of Cl_{2} *1mole of H_{2}}{1moles of Cl_{2}}[/tex]
moles of H₂= 15
15 moles of hydrogen gas are needed to react with 15 moles of chlorine gas.
In an endothermic reaction which bonds are stronger? The reactants or products? Explain
reactants because it had other chemicals, when more are mixed it will be more stronger.
It is the correct answer
15.0 mL of 0.200 M barium chloride solution is mixed with a silver nitrate solution. What mass of silver chloride will be formed?
HELP ME QUICKLY!!
Use the portion of the periodic table shown below to answer the questions. (10 points)
A portion of the first three columns of the periodic table is shown. Column one from top to bottom reads 11 sodium 22.990, 19 potassium 39.098, and 37 rubidium 85.468. Column two reads 12 magnesium 24.305, 20 calcium 40.078, and 38 strontium 87.62. Column three reads 21 scandium 44.956 and 39 yttrium 88.906.
Part 1: Name two elements that have the same properties as potassium (K). (4 points)
Part 2: Determine the number of protons, electrons, and neutrons present in an atom of magnesium (Mg). Explain how you determined your answer using complete sentences. (6 points)
Your answer:
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, elements belonging to the same group have same physical and chemical properties.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
Elements belonging to same column have same physical and chemical properties. 2 elements with same properties as K are rubidium and sodium.
Atomic number of magnesium is 12, means magnesium has 12 electrons, 12 protons. Mass number of Mg is 24. So, to find the number of neutrons we have to subtract 12 from 24, which is 12 neutrons.
Therefore, elements belonging to the same group have same physical and chemical properties.
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if liquid water ___ energy it will become ice
1 loses
2 gains
3 neither loses nor gains
Answer:
the answer is 1- loses
Explanation:
When water freezes it gives up some of the water's energy.
What is the percent by mass of Water in CaSO4•2H20?
Answer:
20.93%
Explanation:
The percent by mass (%mass) of water in the following compound can be calculated thus:
%mass of H2O = mass of 2H2O/mass of compound × 100
Where;
Ca = 40
S = 32
O = 16
H = 1
Hence, the molar mass of CaSO4•2H20 = 40 + 32 + 16(4) + 2{ 1(2) + 16}
= 40 + 32 + 64+ 2{18}
= 172g/mol
Molar mass of 2H2O = 2{2 + 16}
2(18)
= 36g/lol
Therefore, the percent by mass of 2H2O in CaSO4•2H20 is as follows:
36/172 × 100
= 0.2093 × 100
= 20.93%
30 POINTS
do you think snow is an ionic compound or a covalent compound? explain
Answer:
Compounds containing two elements (so called binary compounds) can either have ionic or covalent bonding. If a compound is made from a metal and a non-metal, its bonding will be ionic. If a compound is made from two non-metals, its bonding will be covalent.
Explanation:
Can u mark brainliest please luvss!!
Which is the molar mass of NH₄MnO₄?
Answer:
Molar Mass, Molecular Weight and Elemental Composition Calculator Enter a chemical formula to calculate its molar mass and elemental composition: Molar mass of NH4MnO4 is 136.9741 g/mol
Explanation:
What process in in equilibrium with boiling?
Answer:
Explanation:
evaporation
A student heats 4g of a blue compound, which reacts completely to produce 2.56 g of a white compound and an unknown amount of colorless gas. What is the mass of the gas?(you’ll get points and get marked as brainleist i think)
Answer:
1.44 g
Explanation:
We can solve this problem if we keep in mind the law of conservation of mass, which states that if 4 grams of a compound reacted completely, then the sum of the products has to be 4 grams as well.
(Reactants) 4 g = 2.56 g + x g (Products)We solve for x:
x= 4 - 2.56 = 1.44So the answer is 1.44 g.
Freezing point and boiling point of a substance P is -220 0 c and – 185 0c. A t which of the following range of the temperatures will P exist as liquid state.
Between -175oc to – 210o c
Between – 190oc to – 225oc
Between -200oc to – 160o c
Between -195oc to -215oc
Answer:
Between -195°C to -215°C
Explanation:
We begin from this data:
P under -220°C will be solid, because -220°C is the freezing point.
Above -220°C, P will be at liquid state.
Then -185°C is the boling point, so above that temperature we have P as a gas.
Between -175°C to -210°C
Above -185°C we said that P is gas, so at -175°C P is not liquid. This state is F.
Between – 190°C to -225°C
At -190°C, we can have P as liquid, but -225°C is under -220°C, where P changes from liquid to solid. Then, this state is also F.
Between -200°C to -160°C
Above -185°C we said that P is gas, so at -160°C P is not liquid. This state is also F. The same, as the first situation.
Between -195°C to -215°C
-195°C is a lower temperature than -185°C. P is still liquid, we did not get the boiling point yet. -215°C is higher than -220°C, P is also liquid. There are still 5°C until P completely freezes. This is the correct choice.
Which lists the carbohydrates in order of increasing chemical energy?
a.monosaccharides, polysaccharides, disaccharides
b.disaccharides, monosaccharides, polysaccharides
c.polysaccharides, disaccharides, monosaccharides
d.monosaccharides, disaccharides, polysaccharides
Answer:
d ;)
Explanation:
Answer: D.monosaccharides, disaccharides, polysaccharides
Explanation:
HELP! WILL MARK BRAINLIEST
Answer:
No
Explanation:
A compound is when two different elements join. The model only shows two similar elements, which form a molecule, not a compound.
Is it balanced? How do you know?
Answer:
ok
Explanation:
Answer:
Yes it is balanced
Explanation:
You can check by finding the total of each element on both sides so:
Left Hand Side :
Carbons: 6
Oxygens: 6x2 (carbon dioxide) and 6 (water) so there are 18
Hydrogens: 6x2 (carbon dioxide) so 12
Right Hand Side:
Carbons: 6
Oxygens: 6 (glucose) then 6x2 (oxygen) so there are 18
Hydrogens: 12
Animal cells do NOT
have cell walls. Why do
you think this is an
advantage?
Answer:
Because they don't need them , cell wall which are found in cell, maintain cell shape almost as if each cell has it's own exoskeleton ame this them to stand upright without the need for bones .
Explanation:
Answer step by step please
The concentration of solution : 0.2 M
Further explanationGiven
5.6 g Potassium hydroxide(KOH)
500 ml of solution = 0.5 L
Required
The concentration
Solution
Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
MW KOH = 39+16+1=56 g/mol
mol solute(KOH) :
= mass : MW KOH
= 5.6 : 56 g/mol
= 0.1
Molarity :
= 0.1 : 0.5
= 0.2 M
With which temperature scale is temperature directly proportional to average kinetic energy? Celsius
Kelvin
centigrade
Fahrenheit
Answer:
The Kelvin temperature scale is the scale that is based on molecular motion and so absolute zero is also called 0K.
Explanation: The Kelvin temperature of a substance is directly proportional to the average kinetic energy of the particles of the substance.
Which of the following is NOT a property of ionic compounds
Select one:
a.Forms a crystal lattice structure
b.High melting point
c.Elements in the compound shares electrons
d.Conducts electric when dissolved in water (electrolyte)
Answer:
c.Elements in the compound shares electrons
Explanation:
Because in ionic compounds element lose or gain electrons only
Sharing of electrons is the property of covlant compounds.
HELP FAST 10 POINTS
Steel wool is mostly made of iron. It is a very fine material used as an abrasive. This material oxidizes (rusts) readily in the presence of water and oxygen. Iron nails rust as well. How would the rate of rusting of a piece of steel wool compare with that of an iron nail? Defend your answer.
HELP 10 POINTS
Steel wool rusts faster because more Surface Area is exposed in a steel wool compared to the iron nail and more surface area means faster rusting rates
have a nice day! (^o^)
differentiate between atoms and their ions on the basis of their stability.
Answer:
The difference between an atom and an ion has to do with net electrical charge. An ion is a particle or collection of particles with a net positive or negative charge. ... A stable atom contains the same number of electrons as protons and no net charge. When electrons are added or removed, the stable atom becomes an ion.Apr 12, 2015
Explanation:
hope this helps ✌️
can you help me with this pls
Answer:
B: Covalent Bond
Explanation:
A covalent bond is the sharing of electron pairs between atoms.
Answer:
D, Ionic Bond
Explanation:
What is the density of an object with a mass of 34g and a volume of 13 cm3?
Answer:
d = 2.62 g/cm³
Explanation:
Given data:
Density of object = ?
Mass of object = 34 g
Volume of object = 13 cm³
Solution:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
By putting values,
d = 34 g/ 13 cm³
d = 2.62 g/cm³
