Answer:
The specific heat capacity of the unknown metal is 0.223 [tex]\frac{J}{g*C}[/tex]
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q= 418.6 J c= ? m= 75 g ΔT= 25 CReplacing:
418.6 J= c* 75 g* 25 C
Solving:
[tex]c=\frac{418.6 J}{75 g*25 C}[/tex]
c= 0.223 [tex]\frac{J}{g*C}[/tex]
The specific heat capacity of the unknown metal is 0.223 [tex]\frac{J}{g*C}[/tex]
in which group in the periodic table do we not find metal A.Group 1 B.Group 2 C.Group 3 D.Group 5
Answer:
Group 5
Explanation:
Using method of elimination:
A. Group 1
Also known as the Alkali metals group. It contains metals such as lithium and sodium. This option is incorrect.
B. Group 2
Also known as the Alkali Earth metals group. It contains metals such as Magnesium and calcium. This option is incorrect.
C. Group 3
It contains metals such as Aluminium and scandium. This option is incorrect.
D. Group 5
This is the correct option. The elements in these group are non metals. Examples include Nitrogen.
need the names for these asap please
Answer:
3_ethylpentane
4_ethylheptane
1_pentene
3_hexene
If a star is 300 light years away from Earth, how long does it take light from that star to reach Earth?
A. 300 days
B. 300 hours
C. 300 years
D. 300 light years
which of the following solids would not decompose on heating
Answer:
Anhydrous sodium carbonate is stable to heat and does not decompose even when it is heated to redness. This is because sodium carbonate salt on heating with acids react to release carbon dioxide.
For the reaction, ?N2 + ?H2 → ? NH3,
What is the maximum amount of NH3 which could be formed from 12.26 mol of N2 and 2.11 mol of H2? Answer in units of mol.
Explanation:
➢number of moles. Moles and Chemical Reactions. Chapter 4. 3 H2. + N2. →. 2 NH3 ... How many grams of NH3 would form if 2.11 moles of N2 reacted with ...
A double replacement reaction has two compounds as reactants.
True or false
Answer:
yes, A double replacement reaction has two compounds as reactants.
hence it's true.......
Answer:
it's true...
Explanation:
What is the chemical formula for propane?
C38H
3C8H
C3H8
3CH8
Answer:
C38H
Thank You! :)
Mixing salt with sugar is a chemical change true or false?
Answer:
False unless you add something else with the like the common sugar ice and salt science project.
Explanation:
Answer:
No
Explanation:
No, mixing salt and sugar is not a chemical reaction. Chemical reactions result in the change of chemical composition of one or more substances(it is no longer able to be turned back to normal
How much heat is needed to raise the temperature of 20.0g of H2O by 10.6oC?
Answer:
ΔH = 8.87 x 10₅
Explanation:
q = mcΔT = 20g x 1.00 cal/g°C x 10.6°C = 212 cals x 4.184 j/cals = 8.87 x 10⁵ joules
9. What does C12 (g) represents?
A. Chlorine ions
B. Chlorine liquid
C. Chlorine gas
D. Chlorine atom
Answer:
chlorine gas since it exists as a diatomic molecule
What is the mass percent of carbon in glucose, C6H1206?
Answer:
40%
Explanation:
hope this helps!!!!
Yes
OO
No
Balanced or Not Balanced? *
2 NaCl + 2 F2 → 2 NaF + 1 C12
Yes
No
Answer:
No, not well balanced
Explanation:
2Nacl+F2=2Naf+Cl2
Two grams of sodium chloride (table salt) were completely dissolved in a glass of water. How would you classify the resulting material?
Group of answer choices
As a mixture.
As a salt compound
As a pure substance
As an element
Answer:
This is a mixture.
Explanation:
While you can no longer see the salt when it's dissolved, it's still there! It's just in tiny, tiny, invisible to the eye molecules. It's now a mixture of H20 molecules and NaCl molecules in a solution :)
The water doesn't bond to the salt, so it's not a compound.
It's not just one element, it's a mixture of many!
It's not a pure substance since it's NaCl AND H2O.
how many grams of iorn reacts with 71 grams of chlorine to produce 117 grams of sodium chloride
Answer:
The answer to your question is: 71 g of Chlorine
Explanation:
Na = 46 g
Cl = ?
NaCl = 117 g
Equation
2 Na + Cl₂ ⇒ 2 NaCl
46g X 117g
If we consider the law of conservation of matter, we know that the mass of the reactants equals the mass of the products, then
mass Na + mass Cl₂ = mass NaCl
46 g + X = 117
X = 117 - 46
x = 71 g of Chlorine
*specific heat of tin: 230 | specific heat of carbon: 709*
Which will provide more thermal energy and why?
2 kg of tin at 50 C
or
2 kg of carbon at 50 C
Answer:
tin
Explanation:
since it takes less heat to change it will warm up and produce thermal energy sooner than carbon
2 kg of carbon at 50°C will provide more thermal energy than 2 kg of tin at the same temperature.
To determine which substance will provide more thermal energy, we need to calculate the thermal energy for both scenarios using the formula:
Thermal energy = mass * specific heat * temperature change
For 2 kg of tin at 50°C:
Thermal energy = 2 kg * 230 J/kg°C * (50°C - 0°C) = 23,000 J
For 2 kg of carbon at 50°C:
Thermal energy = 2 kg * 709 J/kg°C * (50°C - 0°C) = 70,900 J
Therefore, 2 kg of carbon at 50°C will provide more thermal energy than 2 kg of tin at the same temperature. This is because carbon has a higher specific heat (709 J/kg°C) compared to tin (230 J/kg°C), meaning it requires more energy to raise the temperature of carbon compared to tin. As a result, carbon can store and release more thermal energy than tin at the same temperature and mass.
To know more about thermal energy, here
brainly.com/question/3022807
#SPJ2
which statement best explains why so many fossils look different from the millions of species currently living on Earth?
A. The rock that makes up the fossils has broken down over time
B. Most species that have lived on Earth are now extinct
C. The fossil record is filled with inaccuracies
D. Organisms are becoming simpler over time through evolution
Answer:
B.
Explanation:
Most species that have lived on Earth are now extinct
<><><><><><><><><><><><><><><><><><><><><><><><>
A P E X
The statement that best explains why so many fossils look different from the millions of species currently living on Earth is: B. Most species that have lived on earth are now extinct.
What are fossils ?
The fossil record is evidence that life on Earth has changed over time, with new species evolving and old ones going extinct. It shows the wide range of life that existed throughout Earth's history, including many species that no longer exist today.
The diversity of fossils is primarily due to the extensive range of species that have lived and gone extinct throughout the history of life on Earth.
Although some fossils may have changed over time or contain inaccuracies, they are still crucial for understanding the evolutionary relationships among different species.
Hence, option B is correct.
Find more on fossils:
https://brainly.com/question/6867325
#SPJ3
Match “the same” or “different” to each sentence.
Answer:
different , same, same, same
What is the mass of 0.25 moles of sulphur dioxide
Answer:
this is the answer okkkkkkkkkkkkkkkk
Which compounds will most likely dissociate when dissolved in water? Select all that apply.
Answer:
A) barium hydroxide
B) ethanol
C) glucose
D) silver nitrate
E) dichloromethane
F) postassium chloride
The other compounds ethanol and glucose are also soluble in water but do not dissociate when dissolved in water.
Explanation:
Please mark this Brainilest.
These compounds will dissociate in water:
A) barium hydroxide
D) silver nitrate
F) potassium chloride
What are ionic compounds?Many compounds do separate when they are dissolved in water. Ionic substances break apart into a positive ion and a negative ion when placed in water, a process known as electrolytic or ionic dissociation. Ionization is the name given to this kind of dissociation reaction.When dissolved in water, many substances do dissociate. It is claimed that substances that dissolve in water form electrolytes, which are ions.Electrolytes can disintegrate into cations and anions after being dissolved, or they may be ionic substances that chemically react with water to produce ions.learn more about dissociation here: https://brainly.com/question/305470
#SPJ2
For the reaction ?H2 + ?O2 → ?H2O,
What is the maximum amount of H2O which could be formed from 15.52 mol of H2 and 17.95 mol of O2? Answer in units of g.
Explanation:
H2O, what is the maximum amount of H2O which could be formed from 10.9 g of H2 and 16.03 g ofO2? Answer in units of g. ... 0.500 mol O2 x 2 mol H2O / 1 mol O2 x 18 g H2O/mol H2O = answer in ..
A mixture of large, dispersed particles.
Answer:
Colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid, liquid, or gaseous medium.
Answer:
Colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid, liquid, or gaseous medium.
Explanation:
I got the answer first
the following punnett square shows a cross between two hybrid flowers. if the flowers show incomplete dominance, what fraction are pure red? I NEED HELP PLZ!
Answer:
1/4
Explanation:
Incomplete dominance is when the dominant ("R") gene is not completely dominant and cannot fully mask or cover the recessive ("r") gene. This means that it will result in both genes expressing and a mix of traits appearing. In the case of a flower with "R" genes for red and "r" genes for white, the following possibly combinations exist:
RR = all red, no white "r" gene
Rr = pink, as both the "R" and "r" genes are expressed
rr = white, no red "R" gene
The Punnett Square shows that only one of the four phenotypes is RR and red.
What are the general trends in first ionization energy across a period (LR) within the
periodic table? From bottom to top within a group?
How many electrons are in the nucleus of an atom with 2 protons and 3 neutrons
Answer:
there'd be 2 electrons
Explanation:
number of electrons= number of protons
how many molecules are present in a sample of carbon dioxide, CO2 with a mass of 168.2g?
Answer:
2.3 X 10^24 atoms CO2
Explanation:
Answer:
2.30 x10²⁴ molecules CO2
Explanation:
Convert mass of CO2 to moles
Convert moles of CO2 to molecules using Avogadro's number.
168.2 g CO2 x 1 mole CO2 / 44 g CO2 x 6.022 x10²³ molecules CO2 / 1 mole CO2
= 2.30 x10²⁴ molecules CO2
Science activity 1.4.2
A baker has two identical cakes except that one cake is hot, and the other cake is room temperature. He places both cakes on an ice-cold
plate. What happens? (Mark the one best answer.)
Both cakes transfer energy to the plate.
The plate transfers energy to the room temperature cake.
Neither cake transfers energy to the plate
Only the hot cake transfers energy to the plate.
Answer:
the plate gets warmer and the cake gets colder
Explanation:
my brain
How do nuclear reactions
produce energy?
nuclear energy originates from the splitting of urinal atoms a process called fish and degeneracy to produce steam which is used by a turbine generator to generate electricity.
what is an isotope
Answer:
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
Explanation:
Diamonds have a density of 3.26 g/mL. What would be the mass of a diamond with a volume
of 0.350 mL?