Answer:
c. energy from splitting energy
Explanation:
12.Put this equation into word form.
Rb + P + Rb3P
rubidium and phosphorus react to form rubidium phosphide
rubidium and potassium react to form rubidium potasside
rubidium plus potassium forms rubidium potasside
rubidium combined with potassium forms rubidium phosphide
Answer:
A. Rubidium and phosphorus react to form rubidium phosphide
Explanation:
P is not potassuim. It is phosporous. So A is the only correct choice.
dk how to do this help please
Explanation:
hello
the answer is b
O or oxygen has 16 molar mass and C or carbon has 12
so CO2 or carbon dioxide=(2×O)+C=(2×16)+12=46
dk how to do this :)
Answer:
2Mg, 2 02, MgO
What is the formula for calculating pH?
O A. pOH= [H*]
————
[OH -]
B. pH = -log[OH-]
C. pH = -log[H+]
D. pH = log[ht]
Answer:
c. pH=-log[H+]
Explanation:
pH=-log10[H+]
calculate the pressure in atmospheres of 1.92 moles of helium gas in a 10.0L container at 25C
The pressure in atmospheres of the given mole and volume of helium gas is 4.7atm.
Given the data in the question;
Amount of helium; [tex]n = 1.92mol[/tex]Volume of the gas; [tex]V = 10.0L[/tex]Temperature; [tex]T = 25^0C = 298.15K[/tex]Pressure in atmosphere; [tex]P = \ ?[/tex]
Ideal Gas LawThe Ideal gas law emphasizes on the behavior of a hypothetical ideal gas. It states that pressure P multiply by volume V is equal to moles times temperature and the universal gas constant.
It is expressed;
[tex]PV = nRT[/tex]
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant.( [tex]R = 0.08206Latm/molK[/tex] ).
To determine the pressure in atmosphere, we substitute our values into the expression above.
[tex]PV = nRT\\\\P = \frac{nRT}{V} \\\\P = \frac{1.92mol\ *\ 0.08206Latm/molK\ *\ 298.15K}{10.0L} \\\\P = \frac{46.975Latm}{10.0L}\\\\P = 4.7atm[/tex]
Therefore, the pressure in atmospheres of the given mole and volume of helium gas is 4.7atm.
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why is accurate body measurement important in dressmaking
Answer:
Without taking body measurements, the fabric material can run out of supply if the tailor uses it too much. And more material is required to fix small dresses or suits. So when body measurements are taken accurately, the tailor will know the exact amount of material to be used.
Explanation:
A student boils water in an electric kettle for 20 minutes. Using the same mains supply, he wants to reduce the boiling time of water. To do so, should he increase or decrease the length of the heating element? Justify your answer.
Answer:
The student needs to increase the length of the heating element
Explanation:
Increasing the length of the heating elements helps to increase the surface area of the heating elements which allows for more water to come in contact with the heating element
2. Which substance has definite volume and weight, but not a definite
shape?
B
A. ice
wood
C. gasoline
D. steam
Answer:
A solid has definite volume and shape, a liquid has a definite volume but no definite shape, and a gas has neither a definite volume nor shape. The change from solid to liquid usually does not significantly change the volume of a substance
Explanation:
no explanation
hard water contains calcium and magnesium ions. one way to soften water is to add sodium phosphate. Write complete and net ionic equations for the reaction of these two alkaline earth metals with aqueous sodium phosphate
Explanation:
The photo is the net ionic equation for the Calcium ions
The net ionic equation for the reaction is [tex]3Ca^{+2} + 2PO^{-3}_2----- > Ca_3(PO_4)_2[/tex]
What is chemical reaction?A chemical reaction is the chemical transformation of one set of chemical substances into another.
When chemical bonds between the atoms are formed or broken, chemical reactions occur.
The substances that initiate a chemical reaction are known as reactants, and the substances that result from the reaction are known as products.
Plants grow, start producing fruit, and decompose to become compost for new plants through chemical reactions.
The reaction for the given scenario is,
[tex]3Ca^{+2} + 2PO^{-3}_2----- > Ca_3(PO_4)_2[/tex]
Thus, above mentioned is the chemical reaction.
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Explain your reasoning for your formula prediction for Ba+2 and S-2. A neutral molecule requires equal numbers of cations and anions. Atoms will not combine unless their ions have an equal but opposite charge. The total charge of cations plus anions must equal zero. all of the above
Answer:
BaS would be a stable neutral molecule!
Reason:- All of the above.
Explanation:
In order to form a neutral molecule it's necessary to balance their charge first, The given components i.e. Ba2+(cation) and S2-(anion) have equal and opposite charges, when they combine they form predominantly ionic compound i.e. Sulphur partly shares it's 2 electrons with Barium and forms Barium sulphide.
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Water is a _____ molecule, which gives it many of its unique properties, including its ability as a universal solvent.
Answer:
The answer is Polar.
Explanation:
Because polar has many unique properties.
When potassium and chlorine form a chemical compound, the atoms
a. become less stable, and covalent bonds are
formed
b. become more stable, and covalent bonds are
formed
c. become less stable, and ionic bonds are
formed
d. become more stable, and ionic bonds are
formed
Answer:
D
Explanation:
Potassium metal and chlorine gas combine to form potassium chloride. The balanced equation is 2K (s) + Cl2 (g)→2KCl (s) There are two chlorine atoms on the left-hand side (LHS) and one chlorine atom on the right-hand side (RHS).
HCl(?) + H2O(?) → H3O+(?) + Cl-(?)
What is the phase label on Cl-?
Answer:
H30,+ion is known as Hydroniom Ion
Explanation:
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everyday
brainless this answer is correct
What are the extensive and intensive properties described in this experiment? Which properties would change and which would stay the same if you ran the experiment sing 7.5-ounce cans instead of 12- ounce cans?
Intensive properties do not change as the size of an object changes but Extensive properties change as the size of an object changes; here the properties can not change because the amount of the water stays the same
What are the difference between Extensive property and Intensive Property ?The physical properties of matter can be divided into intensive and extensive properties and the terms are introduced in 1917 by Richard C Tolman.
Intensive properties are independent of the presence of number of substance and they are bulk properties, here the Characteristic doesn’t change.
The size of intensive properties cannot change, examples are Density, temperature, pressure etc. It can not depend on the amount of matter and also intensive properties are fixed, countable.
Extensive properties are dependent on the presence of number of substance, easily identified, Size of Extensive properties changes and It can be computed.
extensive properties depend on the amount of matter, often changes and are not countable; For example Volume, size, mass, length, weight
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The reaction Na3PO4 + 3HCl → 3NaCl + H3PO4 produces 42.7 g of NaCl. How many grams of Na3PO4 are needed?
Answer:
14.23
Steps given below in the picture
I hope my answer helps you.
find the molarity of 131 g Ba(NO3)2 dissolved in 750.0 water
Answer:
6.68 x 10^-4
Explanation:
131g ÷ 261.337g/mol = 0.5012685 moles
0.5012685 moles ÷ 750.0 liters =
0.5012685÷ 750.0=0.000668358
6.68 x 10^-4
How can you tell that Mercury is not a gas giant?
A.
because it is dense and rocky
B.
because of where it orbits the sun
C.
because it has only one moon
D.
because it has no ring system
Answer:
The answer to this question is A.
hope it helps :)
When salt is added to water, what happens to the molecules?
The water molecules remain together. The salt molecules break apart.
Water and salt molecules remain together.
The water molecules break apart. The salt molecules remain together.
Water and salt molecules break apart.
Answer:
The the salt dissolves
Explanation:
The salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules.
Bonding with intermolecular forces:
1.) is CH3F a hydrogen bonding? yes or no?
2.) is CH3F dipole-dipole interactions? Yes or no?
3.) is CH3F a london dispersion forces? Yes or no?
Explanation:
1.) is CH3F a hydrogen bonding? yes or no? = No, CH3F is not a hydrogen bonding beacuse the molecule lacks hydrogen atoms bonded to nitrogen, oxygen, or fluorine; ruling out hydrogen bonding.2.) is CH3F dipole-dipole interactions? Yes or no? = Yes, CH3F is a dipole-dipole interactions beacuse in it's molecule, there are no metal atoms to form ionic bonds3.) is CH3F a london dispersion forces? Yes or no?= Yes, CH3F is a london dispersion forces because in it's molecule, there are no metal atoms to form ionic bonds .The intermolecular forces present in the bonding of CH₃F are dipole-dipole interactions and London dispersion forces.
1.) No, CH₃F does not exhibit hydrogen bonding. Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom such as fluorine, oxygen, or nitrogen. In CH₃F, the hydrogen atom is bonded to carbon, which is not highly electronegative.
2.) Yes, CH₃F exhibits dipole-dipole interactions. Dipole-dipole interactions occur between molecules that have permanent dipoles due to the electronegativity difference between the atoms. In CH₃F, the fluorine atom is more electronegative than the carbon and hydrogen atoms, resulting in a polar molecule with a permanent dipole moment.
3.) Yes, CH₃F exhibits London dispersion forces. London's dispersion forces, also known as Van der Waals forces, are present in all molecules and arise from temporary fluctuations in electron distribution. Although CH₃F has dipole-dipole interactions, it also experiences London dispersion forces due to the temporary shifts in electron density.
Hence, the bonding in CH₃F was explained above.
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HELPPPPP
54.5 g of Ca(NO3)2 was used to create a 1.5 M solution. What is the volume of the solution in ml?
We have already been introduced to solutions. Several chapters ago molarity (M) was introduced. Molarity is measured in moles per liter, or mol/L. A 0.30 M NaCl solution means that there is 0.30 mol NaCl in every liter of solution.
Often chemists have to make solutions; so, doing the calculations necessary to make a certain amount of solution become second nature.
For example:
Make 250 mL of a 0.30 M NaCl solution.
To make the solution we need to calculate the amount of NaCl to dissolve to make 250 mL of solution.
start with 250 mL
The solution is made by adding 4.38 g NaCl to a 250-mL volumetric flask. About 100 mL of water are added and when all the NaCl dissolves water is added up to the line on the volumetric flask.
But molarity is not the only unit we use; so, we need to be able to convert between different units...
Common units of concentration include
<==> <==><==>
% wt.
% vol
molarity (M)
molality (m)
mol fraction
That is, the mol fraction of "a" is the number of moles of "a" present divided by the total number of moles of material in the solution (including the solvent).
There is no simple formula for converting from one concentration unit to the next. In general the first step is to pick a convenient sample size. Then work to change each part of the concentration unit to the new unit. Do not try to do the conversion all at once.
For example,
HCl comes in bottles marked 37 % HCl by weight. The density of the solution is 1.200 g/cm-1. What is the molarity of the solution?
A conveneint sample size is 100 g of solution; convenient because 100 g x 37% = 37 g HCl.
This is the key...you must know the definitions for all the concentration terms
First, convert number of grams of HCl in your sample to number of moles in your sample (the 100 g of solution).
Second, convert g of solution to L of solution.
Third, divide moles by liters and you have molarity.
What is the molality of this solution?
Going from M to m. Since the concentration is in M a convenient sample size is 1 L.
OK, so the first conversion is not a conversion...there are 12 mol HCl present in 1 L of solution.
The second conversion is not as easy as it first appears. Let's use the density of the solution to perform a conversion from volume to mass.
This is NOT the mass that is used in molality. We just determined the mass of the solution; molality uses the mass of the SOLVENT!
The solution is made of a solvent and a solute. So, the mass of solvent can be found by subtracting the mass of the solute from the mass of the solution.
6.
Which of the following is NOT an example of a chemical change?
A. burning wood
B. the production of simple sugars through photosynthesis
C. fermentation of sugars into alcohol
D. grinding wood into sawdust
Answer:
D
Explanation:
Which of the following is not an example of a modified silicate?
Ceramics
Glass
Cement
Quartz
Quartz is not regarded as an example of a modified silicate.
What is Quartz?This is defined as a hard, crystalline mineral composed of silica with a tetrahedral shape. Silica is also referred to as Silicon dioxide(SiO₂).
This type of mineral is a naturally occurring crystal and isn't a modified silicate but the rest can be modified using their respective constituents thereby making option D the most appropriate choice.
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10) What volume of oxygen at STP must react with 5.8 L of hydrogen to form water?
(Hint: write and balance the reaction first)
The answer is 2.9L (I NEED THE STEPS)
2.9 L of oxygen are required to react with 5.8 L of hydrogen at STP to form water.
What is the balanced equation of the formation of water?Hydrogen gas and oxygen gas combines in a molar volume ratio of 2 : 1 to form water.
The equation of the reaction is given as follows:
2 H2O + O2 ----> 2 H2OThus, twice the volume of hydrogen is required with a given volume of oxygen to form water.
If 5.8 L of hydrogen is available for reaction at STP, the volume of oxygen required all be half of 5.8 L.
Volume of oxygen required = 5.8 / 2 = 2.9 L
Therefore, 2.9 L of oxygen are required to react with 5.8 L of hydrogen at STP to form water.
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Please Help Me Answer Numbers 7, 9, 10, and 11!
Write a net ionic equation for the reaction that occurs when magnesium carbonate (s) and excess hydrochloric acid (aq) are combined.
Answer:
2HBr(aq) + MgS(s) → MgBr2(aq) + H2S(g)
excess
Sulfide ion in solution exists as HS-. Adding additional H+ forces it to H2S gas.
H2S(g) <=> H+(aq) + HS-(aq)
A complete ionic equation also contains the spectator ions, whereas a net ionic equation just displays the chemical species that are involved in a reaction. when MgCO₃ (s) and excess HCl (aq) are combined, the equation becomes MgCO₃ (s) + 2H⁺ (aq) → Mg²⁺ (aq) + H₂O (l) + CO₂ (g).
The chemical species that change chemically are identified by the net ionic equation. The ions that show up on both sides of the equation are stable and are therefore referred to be spectator ions.
Spectator ions are ions that are present on both sides of chemical reactions but do not take part in the reaction itself. The spectator ions on both sides of the equation are canceled in the net chemical reaction.
The complete ionic equation is:
MgCO₃ (s) + 2H⁺ (aq) + 2Cl⁻ (aq) → Mg²⁺ (aq) + 2Cl⁻ (aq) + H₂O (l) + CO₂ (g)
The net ionic equation is:
MgCO₃ (s) + 2H⁺ (aq) → Mg²⁺ (aq) + H₂O (l) + CO₂ (g)
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Determine the type of reaction: AgNO3 + Cu --> Cu(NO3)2 + Ag
a. Double displacement
b. single displacement
c. Decomposition
d. Synthesis
Answer:
b. single displacement
Determine the hybridization about O in CH3oh
Answer:
c
Explanation:
lol
A sample of neon gas has a volume of 5.0 mL at a pressure of 1.50 atm. What is the pressure exerted by the gas if the volume is increased to 10.0 mL, at constant temperature?
A. 1.5 atm
B. 9.0 atm
C. 0.25 atm
D. 7.5 atm
E. 0.75 atm
Answer:
p2 = .75 atm
Explanation:
p1 v1 = p2 v2
5 * 1.5 = p2 10
What is the definition of specific heat?
A. The heat needed to raise the temperature of 1 g of a substance
1°C
B. The temperature change between the melting and boiling points of
a substance
C. The heat required to break the molecular bonds within a
substance
OD. The total amount of energy contained within 1 mole of a
substance
SUBMIT
Answer:
A: The heat needed to raise the temperature of 1 g of a substance1°C
Explanation:
Specific heat is the temperature required to raise the temperature of the unit mass of a given substance. With that being said, of all options A: protrays the definition perfectly.
Side Note: I hope this helps feel free to let me know if you have any other questions.
How many moles of water are produced from the decomposition of 3.4g of hydrogen peroxide, H2O2
Answer:
0.1 moles
Explanation:
3.4 g * (1 mol/34 g) = 0.1 moles
