Answer:
To find the relative formula mass (M r) of a compound, you add together the relative atomic mass values (A r values) for all the atoms in its formula.
Explanation: Find the M r of carbon monoxide, CO. Find the M r of sodium oxide, Na 2O. The relative formula mass of a substance, shown in grams, is called one mole of that substance.
PLEASE HELP
If I put more air in a car tire, which relationship does it show?
a. pressure and volume
b. temperature and volume
c. amount of gas and pressure
Selected: d. temperature and pressure
Answer:
amount of gas and pressure
Which type of pressure system is located near Seattle? *
Answer:
Seattle is shielded from extreme weather by the Cascade and Olympic mountain regions to the east and west, respectively. Low pressure systems tend to come from the south while high pressure systems tend to come from the north.
Calculate the amount of heat energy is needed to raise the temperature of 5.00 grams of lead from 25.0 to 35.0 degrees Celsius, if the specific heat capacity of lead is 0.129 J/g/C.
Answer: 6.45 Joules
Explanation: I just did it
In order to calculate the number of neutrons you must subtract the what from the what?
Answer:
You take the atomic, or proton number of the element, and you subtract it from the element's mass number.
Answer:
protons
Explanation:
neutrons and protons make up the mass of the atom
which will have a greater inertia the moon or the earth
Describe how you could show that a compound is an acid
Name a substance which will undergo changes from solid to liquid to gas between 0c and 100c
Answer:
WATER
Explanation:
Water melting point 0 c boiling 100c
On the calendar provided below, the full moon is shown happening on the eleventh of the month? What moon would you see around the 25th of the month, shown with the question mark? Question 8 options: A. First Quarter B. New Moon C. Waxing Crescent D. Waning Gibbous
Answer:
The correct answer is - B. New Moon.
Explanation:
The change of moon disc from all black to all light to all dark again is called the lunar cycle. It takes almost 30 days (29.53059 to be precise). The time from all black to all light or all light to all black is almost 15 days. All black moon is termed as the new moon and all light is termed as the full moon.
As given that the full moon is shown happening on the eleventh of the month then what moon would be around 25 which is 14 days later that should be in waxing gibbous phase and almost new moon.
Thus, the correct answer is - B. new moon.
If there are 3 cats but they each die of different diseases one of heart fail, second of Brian tumor and 3rd of experiment gone wrong, which how many cats are left.
Answer:
none
Explanation:
It is given that there are 3 cats.
Each of the cats die with different diseases. One of cats died due to heart failure, the second cats died because of brain tumor and the third cat died due to an experiment gone wrong.
So there are none of the cats left out. All the cats died due to different reasons.
A cylinder is filled with 10.0 L of gas and a piston is put into it. The initial pressure of the gas is measured to be 273. kPa.
The piston is now pulled up, expanding the gas, until the gas has a final volume of 50.0 L. Calculate the final pressure of the gas. Be sure your answer has the
correct number of significant digits.
P2 = 54.6 kPa
Explanation:
Given:
V1 = 10.0 L. V2 = 50.0 L
P1 = 273 kPa. P2 = ?
We can use Boyle's law to solve this problem.
P1V1 = P2V2
Solving for P2,
P2 = (V1/V2)P1
= (10.0 L/50.0 L)(273 kPa)
= 54.6 kPa
How much energy is released when 75g of liquid water is reduced from 65c to 0c and completely freezes?
Answer:
Q = 20377.5 Joules
Explanation:
Given the following data;
Mass = 75g
Initial temperature = 65°C
Final temperature = 0°C
Specific heat capacity of water = 4.18 J/g°C.
To find the quantity of heat released;
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
dt represents the change in temperature.
Substituting into the equation, we have;
[tex] Q = 75 * 4.18 * 65 [/tex]
Q = 20377.5 Joules
If the [H+] in a solution is 1.0 x 10-7M, what is the [OH-] of this solution?
A. Higher than [H+]
B.lower than [H+]
C.same as [H+]
Answer:
C.same as [H+]
Explanation:
Autoionization of water is expressed as H+ * OH- = Kc
The value of Kc is 1*10^-14. Now simply plug thus in and the value of given H+ to solve
(1*10^-7) * OH- = 1*10^-14
OH- = 1*10^-7
Thus, in this scenario, the H+ and OH- ions have same concentration and solution is said to be neutral.
How many calories are absorbed in a process that absorbs 0.128 joules?
A. 0.031 cal
B. 0.536 cal
C. 536 cal
D. 0.310 cal
Given the information in the velocity vs. time graph,
what is the displacement of the object after 1 second?
After 3 seconds?
After 5 seconds?
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how to calculate the mass percent of hydrogen
Answer:
divide the mass of element in 1 mole of the compound by the compound's molar mass and multiply the answer by 100.
Explanation:
take the molar mass of hydrogen in the water molecule, divide by the total molar mass of water, and multiply by 100.
does it help?
Energy is released when the nucleus of an atom splits and two smaller atoms are formed. What is the name of this process?
A. Electricity
B. Nuclear Fusion
C. Positron Particles
D. Nuclear Fission
Explanation:
It's (D), nuclear fission................
(PLEASE HELP) 500 mL of a gas is collected at 745 mmHg. What will the volume be at 1.8 atm?
Answer:
272.22 mLExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we're finding the new volume we have
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
First convert 745 mmHg to atm
760 mmHg = 1 atm
745 mmHg = 745/760 = 0.98 atm
We have
[tex]V_2 = \frac{500 \times 0.98}{1.8} \\ = 272.222...[/tex]
We have the final answer as
272.22 mLHope this helps you
What is cells function of animal cell??
PLZ HELP ME
Answer:
Controls the movement of substances into and out of the cell.
18.) CCC Energy and Matter Photovoltaic power from solar panels and biomass
energy are obviously forms of solar energy, coming from sunlight. Explain why
both wind power and hydroelectric power can also be considered to be forms of
solar energy.
Answer:
See Explanation
Explanation:
Renewable energy sources refers to those energy sources that can never be depleted. This means that they can be used severally without getting exhausted. Solar, biomass, wind and hydroelectric power are all renewable energy sources.
Hence, from the perspective described above, we can say that wind is a form of solar energy because wind is formed when the air is heated by the sun.
Hydroelectric power is driven by the water cycle. This water cycle somehow depends on the sun to run efficiently. So, hydroelectric power can also be considered to be a form of solar energy.
1.16g of methane burns completely with 4.16g of oxygen to form 3.52g of carbon dioxide and
water If the reaction obeys the law of conservation of mass, the weight of water formed is
Answer:
weight of H₂O formed = 2.3 grams H₂O (2 sig. figs.)
Explanation:
Rxn: CH₄(g) + 2O₂(g) => CO₂(g) + 2H₂O(g)
Given: 1.16g 4.16g 3.52g ? (g)
Moles: 1.16g/16g·mol⁻¹ 4.16g/32g·mol⁻¹ 3.52g/44g·mol⁻¹
= 0.0725mol. = 0.13mol. = 0.08mol. => ? (moles)
Limiting Reactant: Divide each mole value by related coefficient of balanced standard equation (that is, balanced with coefficients in lowest whole number ratios). The smaller value is the limiting reactant.
0.0725/1 0.13/2 0.080/1
= 0.0725 = 0.065 = 0.080
Limiting Reactant is O₂(g) => 0.065 is smaller value after dividing each mole value by related coefficient of balanced equation.
NOTE: When working problem, however, one must use the mole value calculated from given amount in grams. That is, in this case 0.13 mole O₂. The 'divide by related coefficient and check smaller value' is ONLY for identifying the limiting reactant. This trick works for ALL general chemistry problems.
Moles H₂O formed: Since the coefficient of the limiting reactant (O₂) equals the coefficient of water (H₂O), then the moles of water formed is 0.065 mole H₂O.
Weight (in grams) of H₂O formed:
Grams H₂O = moles H₂O x formula weight H₂O
= 0.13 mole H₂O x 18 g H₂O/mole H₂O
= 2.34 g H₂O (calculator answer)
= 2.3 g H₂O (final answer should be rounded to 2 sig. figs.) => form of final answer should be based on data in final computation having the least number of sig. figs.
Review: Sequence of calculations
Write and balance equation to smallest whole no. ratio of coefficients.If not in moles, convert given 'measured' data to dimension of moles. => moles = mass (g)/formula wt(g·mol⁻¹) => moles = volume of gas in Liters/Std Molar Volume (= 22.4L·mole⁻¹ at STP) => moles = no. of particles / Avogadro's No. (= 6.02 x 10²³ part's/mole)Determine Limiting Reactant => mole values of each compound given / related coefficient in standard equation => smallest value is L.R.Determine moles of unknown needed/used/formed from limiting reactant in moles and coefficient of unknown compound in standard equation given data values.=> moles of limiting reactant / coefficient of same cpd. in std. equation = unknown (X) / coefficient of same (unknown) cpd. in std. equation
=> cross multiply and solve for unknown (X)
=> L.R.(moles) / eqn. coef. of L.R. = X / eqn. coef. of X
=> (L.R.(calc'd moles)(eqn. coef. of X) = (X)(eqn. coef. of L.R.)
=> X (in moles) = (L.R.(calc'd. moles)(eqn. coef. of X) / (eqn. coef. of L.R.)
Convert X-answer in moles to desired dimension specified in problem.=> grams = moles x formula wt.
=> volume (L) = moles x std. volume (= 22.4L/mole)
=> #particles = moles x Avogadro's Number (= 6.02 x 10²³ parts/mole)
Whoever solves this right will get brainliest :3
Reaction 1 → Al + Zn²⁺ ⟶ Al³⁺ + Zn
Reaction 2 → Al³⁺ + Li ⟶ Al + Li⁺
To Find :-Substance OxidisedSubstance ReducedOxidizing Agent Reducing Agent Answers :-Reaction 1 :-
Substance Oxidised :- Al
Substance Reduced :- Zn²⁺
Oxidizing Agent :- Zn²⁺
Reducing Agent :- Al
Reaction 2 :-
Substance Oxidised :- Li
Substance Reduced :- Al³⁺
Oxidizing Agent :- Al³⁺
Reducing Agent :- Li
____________________Final Answers :-Reaction 1 :-
Al
Zn²⁺
Zn²⁺
Al
Reaction 2 :-
Li
Al³⁺
Al³⁺
Li
____________________Which phrase describes a volcano that is not expected to erupt again?
1 quiet volcano
2 extinct volcano
3 dormant volcano
4 explosive volcano
Answer:
Extinct
Explanation:
Extinct volcanos are not expected to erupt, and have not erupted in a very long time.
If an object is on top of a hill or in a position raised above the ground, it must have __________.
Answer:
The force applied to the object is an external force, from outside the system. When it does positive work it increases the gravitational potential energy of the system. Because gravitational potential energy depends on relative position, we need a reference level at which to set the potential energy equal to 0.
If an object is on top of a hill or in a position raised above the ground, it must have gravitational potential energy.
What is Potential Energy ?
In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors
If an object is lifted, work is done against the force of gravity.
When work is done energy is transferred to the object and it gains gravitational potential energy.
If the object falls from that height, the same amount of work would have to be done by the force of gravity to bring it back to the Earth’s surface.
Due to the Principle of Conservation of Energy we can say that:
Gravitational potential energy at the top = kinetic energy at the bottom
To know more about Potential Energy
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Given the following equation: Na2O + H2O ---> 2 NaOH
How many moles of NaOH are produced from 1.02 moles of Na2O?
Answer:
2.04 moles
Explanation:
Since the ratio of Na2O to NaOH is 1:2, you multiply the number of moles by 2, equaling 2.04 moles.
Zn + 2HCl → ZnCl2 + H2
How many moles of hydrogen are produced from the reaction of
6.0 moles of zinc?
Answer:
6
Explanation:
6.0mol ( 1 mol H2/ 1 mol Zn ) = 6.0 mol of H2
H2 is hydrogen gas (hydrogen in the air).
Given the formula of a compound:
(1) aldehyde
(2) alkene
(3) alkyne
(4) alcohol
Answer:
Number 3 alkyne is the answer
Explanation:
Answer: The answer is Alkyne.
Atoms that have become negatively charged by gaining extra electrons are called
Answer:
CATION
Explanation:
If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.
How many moles of CO2 are there in 2.55E18 molecules of CO2?
Answer: 1.535e42 (or 1.535x10^42) moles of CO2
Explanation: i know this is six days late, but all you have to do for this one is multiply 2.55e18 by the standard mole value, 6.02e23 and your calculator will give you 1.535e42 moles!
What is the pOH in a solution that has pH = 11.397
Answer:
The pOH is 2.603
Explanation:The formula for finding pOH by pH is simply subtracting the pH from 14 pOH=14-11.397pOH=2.603.
Mg + 2HCl → MgCl2 + H2
How many grams of hydrochloric acid (HCI) is needed to produce 200g of H2?
Answer:
7242.1g
Explanation:
The balanced equation for this reaction is as follows:
Mg + 2HCl → MgCl2 + H2
From the above equation, it can be observed that 2 moles of HCl is needed to produce 1 mole of H2.
Using the formula below, we convert the mass of H2 to moles;
Molar mass of H2 = 2.016g/mol
mole = 200/2.016
mole = 99.21mol of H2
Since 2 moles of HCl is needed to produce 1 mole of H2.
Then 99.21 moles of H2 will be produced by 99.21 × 2 = 198.4mol of HCl
Molar mass of HCl = 1 + 35.5
= 36.5g/mol
Mole = mass/molar mass
Mass = molar mass × mole
Mass = 36.5 × 198.4
Mass = 7242.1g