Answer:
B
Explanation:
because B has a lower bp it needs less time and energy to turn into vapour and is collected into the condenser first
Fe-54 = 5.845%
Fe-56 = 91.754%
Fe-58 = 2.119%
(Please help)
Calculate the average atomic mass/ given their percent abundance
Answer:
55.768
Explanation:
The following information is given in this question:
Fe-54 = 5.845%
Fe-56 = 91.754%
Fe-58 = 2.119%
First, we convert from percentage abundance to decimal abundance
Fe-54 = 5.845% = 0.05845
Fe-56 = 91.754% = 0.91754
Fe-58 = 2.119% = 0.02119
To find the average atomic mass of iron (Fe), we multiply each isotopes' decimal abundance by its mass no and find the sum as follows:
Average atomic mass = (0.05845 × 54) + (0.91754 × 56) + (0.02119 × 58)
Average atomic mass = 3.1563 + 51.38224 + 1.22902
Average atomic mass = 55.768
Stae the change in oxidation state of iron during the reactiong of iron extraction
Answer:
3
Explanation:
The reaction for the extraction of Iron is :-
2Fe2O3(s) + 3C(s) → 4Fe(l) + 3CO2(g)
O.S. of Fe in Fe2O3 is 3 and O.S. of Fe(l) is 0change in oxidation state (O.S.) = higher O.S - lower O.S
= 3 - 0
= 3
the liquid left after crystallization is
Answer:
The liquid left after crystallization is called Residue
What kind of reactions are redox reactions
A reaction in which reduction and oxidation take place simultaneously known as a redox reaction.
Help me and I'll make u Brainly eat and follow u
19. moth balls in the closet and observe after several days.
20. whenever wax or a candle burns it turns from solid to liquid but again at room temperature it turns to solid
21. evaporation, condensation, precipitation
22. it produces new substances
23. vinegar Bubbles when baking soda is added
24. steam
if you have a pop quiz and you get nervous is that unconditioned response? if yes why? if not what kind of response is it
True or false, Henry Moseley discovered through X-Ray crystallography the number of neutrons that were present
in the nucleus of atoms of every element.
Answer:
Im pretty sure its true
Explanation:
Answer:
answer is true .
Explanation:
this may help you
Why does every chemical reaction require a certain amount of activation energy?
Explanation:
Activation energy is the minimum amount of energy required for a chemical reaction to take place.
When a chemical reaction occurs then bonds between the reactants break and bonds between the products are formed. This leads to the formation of an activated complex which is also known as transition state.
So, in order to form the activated complex a minimum amount of energy is necessary and this energy is known as activation energy.
Identify each as measurement for area, volume, density, time, mass temp, length: ns, 12g/ml,
1.8pm, 250m2 ,325K and 5.4mL and 90kg
Answer:
ns - time
12g/ml - density
1.8pm - length
250m2 - area
325K - temperature
5.4mL - volume
90kg - mass
Explanation:
The unit of measurement is used to identify what a measurement is. It is very important to place a specific unit for each measurement made as it distinguishes them from one another. In this question, various measurements were given, which can be identified using their units.
- ns is measurement for time because seconds (s) is its unit
- 12g/ml is measurement for density because grams/milliliters (g/mL) is its unit
- 1.8pm is measurement for length because length can be measured in picometer (pm).
- 250m2 is measurement for area because metre² (m²) is its unit.
- 325K is measurement for temperature because Kelvin is the absolute unit for temperature.
- 5.4mL is measurement for volume because volume can be measured in milliliters (ml).
- 90kg is measurement for Mass because kilograms (s) is its unit.
If you produce 35.7 grams of sodium chloride how many molecules of Chlorine gas were
needed?
2Na + Cl2 --> 2NaCl
(PLS HELP ASAP)
Explanation:
I did it in steps to help u to understand :)
Someone please do a True or false of all of these
Answer:
1. False
2. True
3. False
4. False
5. True
6. False
7. True
8. True
9. True
What are the differences between molecule of an elements and molecules of a compound?
a compound is a pure substance made up of two or more elements chemically combined a molecule is defined as the smallest particle of an element which can exist separately elements are pure substances which can not be split into simple substances by chemical means the atom is defined as the smallest particle of an element which can take part in a chemical change so I think the difference between the molecule of a compound is bigger than the molecule of a compound
State one human activity that increase the amount of carbon dioxide in the atmosphere today.
Answer:
Burning of fossil fuels
Explanation:
Human activities that increase the amount of carbon dioxide in the atmosphere are;
1) Burning of fossil fuels in industrial and internal combustion engines
2) Depletion of the available forest cover, due to the consumption of wood as a raw material
3) Farming expansion that lead to clearing of forests for farming
4) Industrial activities such as the production of cement
5) Deforestation to provide land for development including buildings and infrastructure.
At a recycling plant, old tin cans are melted down and reconstructed. This is an example of a ___________.
A balloon, inflated in an air-conditioned room at 27.0°C, has a volume
of 4.50.L. It is heated to a temperature of 57.0°C. What is the new
volume of the balloon if the pressure remains constant?
Answer:
4.95L
Explanation:
Using Charle's law equation;
V1/T1 = V2/T2
Where;
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the question, the following information was given:
V1 = 4.50L
V2 = ?
T1 = 27°C = 27 + 273 = 300K
T2 = 57°C = 57 + 273 = 330K
Using V1/T1 = V2/T2
4.50/300 = V2/330
Cross multiply
300 × V2 = 4.5 × 330
300V2 = 1485
V2 = 1485 ÷ 300
V2 = 4.95L
WHAT IS PHOTOSYNTHESIS??
Answer:
the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
Answer:
the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
According to kinetic-molecular theory, which of the following would not be considered an ideal gas? Check all that apply.
a gas at very high temperatures, when gas particles are moving very quickly
a gas at very low volumes, when gas particles are very close together
a gas at very low temperatures, when gas particles have very little kinetic energy
a gas at very low pressures, when gas particles are very far apart
a gas with highly polar molecules that have very strong intermolecular forces
Answer:
a gas at very low temperatures, when gas particles have very little kinetic energy
Explanation:
Answer:
B, C, and E!
Explanation:
got it correct on edge! :)
sodium is more reactive than magnesium. Give reason
Answer: According to the reactivity of metals Sodium is the second metal while Magneesium is the fourth metal. The metal in the top of the reactivity serise table are more reactive.
(The series obtained by the arrangement of metals in the decending oder of their reactivity is the REACTIVITY SERIES TABLE)
Explanation:
K
Na
Ca
Mg
Al
Zn
Fe
Sn
Pb
H
Cu
Hg
Ag
Pt
Au
Therefore Sodium is more reactive than Magnesium
Answer:
The alkaline-earth metals tend to lose two electrons to form M 2+ ions (Be2+, Mg2+, Ca2+, and so on). These metals are less reactive than the neighboring alkali metal. Magnesium is less active than sodium; calcium is less active than potassium; and so on. These metals become more active as we go down the column.
CAN SOMEONE PLEASE ANSWER THIS PAGE ILL GIVE YOU ALL MY POINTS
Answer: the equation for the reaction is NH4Cl (s) --> NH3 (g) + HCl (g)
equation for heat reaction:
ΔH25° = (ΔH25° NH3 + ΔH25° HCl) - ΔH25° NH4Cl)
question 2:
the 1st and 3rd reactions are better ontained through refrence sources and the 2nd and 4th are the easiest and safest to measure in the laboratory. The 1st and rd reaction contains noxious gases this is because there is a (g) in both of the reactions. And the 2nd and 4th does NOT contain noxious gases so i assume its the safest to measure out in the lab
can you answer with working out
How much water will the measuring cup have if you poured 1/2 of it out?
An atom with 6 protons and 8 neutrons is an)
Answer: carbon (C)
Explanation:
I am so lost Helppp! step by step would be great and any links would help!
Answer: i dont know
Explanation:
convert 256 ml to kl
Answer:
0.000256
Explanation:
Formula:
Divide the value volume by 1e+6
1 kl equal to 1000000ml
Specific heat capacity is _____.
greater for metal than for wood
the amount of heat required to raise the temperature of 1g of a substance 1 oC
represented by the symbol, Q
all of these
Answer:
all of this
Explanation:
Oxygen is a diatomic element.why give reason.
Answer:
Diatomic molecules contain two atoms that are chemically bonded. If the two atoms are identical, as in, for example, the oxygen molecule (O2), they compose a homonuclear diatomic molecule, while if the atoms are different, as in the carbon monoxide molecule (CO), they make up…
Explanation:
yei hoo arko aaxaina ...
What are the uses of iron and it's reasons.
Answer:
Uses of iron
It is used to manufacture steel and also used in civil engineering like reinforced concrete, girders etc. Iron is used to make alloy steels like carbon steels with additives such as nickel, chromium, vanadium, tungsten, and manganese.
Answer:
iron is used to make water pipes.
used for making machines in industries.
used for making steam engine.
help me please give two example in which physical change take place please help me
Answer:
Boiling, melting
Explanation:
Physical changes affect the form of a chemical substance.
please help. need this asap!!
Answer:
E.....Na2I.,.
Explanation:
Cuz sodium has a Vallency..1......lodide has Vallency 2
help me plz!!!!
a. Calculate the solution concentration for each of the HCl samples. The first one has been done for you.
b. As the concentration of the HCl solution increased, did the speed of the reaction increase or decrease?
c. Therefore, as the concentration of a reactant increases, does the rate of the reaction increase or decrease?
d. Do your predictions previous to this investigation agree with your results?
e. Make a general rule about the effects of concentration of reactants on reaction rates.
Answer:
From this solution, you can do the a number question answer.
