The mass of the metal can be determined using the calorimetric equation. The specific heat of the metal is 0.780 J/degree Celsius and heat required is 45 J. Then, mass of the metal sample is 28.8 g.
What is calorimetry ?Calorimetry is analytical tool used to measure the heat energy absorbed or released by a system. The calorimetric equation of heat energy q with mass m, specific heat c and temperature difference ΔT is:
q = m c ΔT
Given ,
q = 45 J
c = 0.780 J/g℃
then, the mass m in grams is calculated as follows:
m = q/c ΔT
m = 45 J/ 0.780 J/g℃ × 2°C = 28.8 g.
Therefore, the mass of the metal with a specific heat of 0.780 J/g℃ requires 45.0 J of heat to raise the temperature by two degrees Celsius is 28.8 g.
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explain why pure water is a compound, but water from a fountain is not.
which noble gas is closet to magnesium, Mg, on the periodic table
Answer:
neon gas is the closest noble gas to magnesium ( mg ) on the periodic table.
Explanation:
hope this answer will help you
which period of the periodic table is completely made up of elements with no known stable ions?
Answer:
I think the answer is period 7
Explanation:
The period in periodic table, in which no stable ions of elements exists is 7th period. They contains actinides.
What are actinides?Actinides are 7th period elements classified to F block of periodic table. A periodic table contains vertical columns called groups and horizontal rows called periods. Each elements are classified into suitable groups based on their similarity in properties with other group elements.
There are four blocks in periodic table which are s, p, d and f block. S block elements are metals and d block contains transition metals and p block have non metals including gases and metalloids.
Actinides are f- block metals. All the elements in the period are radioactive. That's why they don't have a stable isotope or ion. They continuously undergo radioactive decay by the emission of charged particles.
Hence, the period containing unstable elements is 7th one.
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What is the isotopic notation for radon -198
Answer:
All radon isotopes have 86 protons (Z=86). But radon-222 has 136 neutrons (86 + 136 = 222). Whereas radon- 220 has only 134 neutrons (86 + 134 = 220). The chemical symbol for radon is Rn, and the mass number is usually placed either after the symbol (Rn-222) or to the left and above it (222Rn).True of False: When air is dense, its molecules are packed tightly together.
Answer:
That false they are solids so they don't pack
And i love the movie sci-ki the anime series
The statement "When air is dense, its molecules are packed tightly together" is true.
What is air?Air is a mixture of gases. Air is present in the atmosphere and everywhere except in a vacuum. Air is made up of different types of gases. It is necessary for life because it helps in breathing.
The air is also made up of atoms. The atoms are present in different places according to the temperature and pressure of the atmosphere. The atoms come closer when the temperature is low.
This is called density. The atoms become dense when the temperature is low, the molecules become packed tightly together. The air converts into water molecules or the air freezes. When the temperature becomes high, the molecules go far away from each other, which makes it less dense.
Thus, the statement is true.
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Which type of seismic wave can move through solid layers of the earth but not through
the liquid outer core?
Oh
Answer:
S - waves
Explanation:
Secondary s-waves are elastic waves and they are part of the earliest waves that reach are seismic station.
Both P and S -waves are the first set of waves to reach a seismic station after an earthquake event.
P waves are primary waves and they move through any kind of earth materials. They transmitted longitudinally. S - waves are secondary waves. These waves are shear waves and they cannot be propagated through liquids.name a non metal having more density. plss help friend,,I Will Mark as BRAINILLIST
Answer:
Iridium and osmium have the highest densities.
if water were a non-polar
Molecule
Answer:
Water would not be able to transport nutrients -‐-‐ in plants, or in our bodies -‐-‐ nor to dissolve and transport waste products out of our bodies. ... Cohesiveness, adhesiveness, and surface tension: would decrease because without the +/-‐ polarity, water would not form hydrogen bonds between H20 molecules.
10.A certain ion of an atom possesses 16 neutrons, a mass number of 31 and a charge
of-3, this ion then contains:
A. 19 protons
B. 13 electrons C. 12 electrons D. 18 electrons
Answer:
B. 13 electrons
Explanation:
Bcoz protons are the same with electrons and the neutrons too.
Balance the equation below
Fe,
Fe+
02
if 10 moles of solute is dissolved in enough water to make 2 L of solution what is the mmolarity. please help me I don't know how to do this.
Answer:
i believe that the answer is .500mol/ .250 liters =2.0M solution
A Chalcogen and an Alkali metal would come together to form a
compound with a ratio of... Note: the ratio must represent the proper order
in which the elements would combine to form the compound*
Answer:
2:3
Explanation:
pls make me brainliest
Read the passage from Hamlet, Act III, Scene iv.
Gertrude: What wilt thou do? thou wilt not murder me?
Help, help, h!
Polonius: [Behind.] What, h! help! help! help!
Hamlet: [Draws.] How now! a rat? Dead, for a ducat, dead! [Makes a pass through the arras.]
Polonius: [Behind.] O! I am slain.
Gertrude: O me! what hast thou done?
Hamlet: Nay, I know not: is it the king?
Gertrude: O! what a rash and bloody deed is this!
Which element of tragedy does Shakespeare most develop in this passage?
conflict among characters
suspense in the plot
hero overcoming tragedy
unhappy ending for the main character
Answer:
conflict among characters
Explanation:
Answer:
Conflicting among characters
Explanation:
Zinc metal can be obtained from Zinc Oxide by reaction at high temperature with CO. The CO is obtained from burning C in limited oxygen.
a) Write the balanced equation for the above reactions
b)What is the amount of Zn that can be obtained from 75g of zinc oxide and 50g of Carbon
Answer:
(a): 2ZnO(s) -----------> 2Zn(s) + O2(g)
2C(s) + O2(g) ---------> 2CO(g)
(b): ZnO(s) + C(s) ---------> Zn(s) + CO(g)
Volatility and vapor pressure are ________. Volatility and vapor pressure are ________. not related directly proportional to one another both independent of temperature the same thing inversely proportional to one another
Answer:
directly proportional to one another
Explanation:
Volatility refers to how quickly a substance changes from liquid to gas.
If a substance has a high vapour pressure, the substance is highly volatile. Similarly, if a substance has a low vapour pressure, then the substance is much less volatile.
This implies that volatility and vapour pressure gives a direct proportionality.
21. Why are radioactive nuclei unstable?
a. There is not the proper neutron to proton ratio resulting in a stable nucleus
b. There is too much energy stored in the bonds between atoms
C. They need to gain/lose electrons to have a full valence energy level
d. Protons reverse their charges and begin to repel one another
Answer:
a. There is not the proper neutron to proton ratio resulting in a stable nucleus
Explanation:
Radioactive nuclei are unstable because they do not have a proper neutron to proton ration that can result in a stable nucleus for them.
Every atomic nucleus has specific neutron to proton ratio. The ratio ensures the stability of the nucleus. Any nucleus with a neutron/proton combination different from its stability ratio will be unstable and split into one or more other nuclei. This is usually with an attendant emission of small particles of matter and electromagnetic ionizing radiation and energy.How many molecules are in 11.75 moles of water (H2O)?
Answer:
7.07585×10^24 molecules
Explanation:
# of Moles X Avogadro's Number= # of Molecules
According to the concept of Avogadro's number, there are 7.075×10²⁴ molecules in 11.75 moles of water.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number. Number of molecules is calculated as:number of moles×Avogadro's number
∴number of molecules= 11.75×6.022×10²³=7.075×10²⁴ molecules.
Thus, there are 7.075×10²⁴ molecules in 11.75 moles of water .
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Hund's rule states that electrons must spread out within a given subshell before they can pair
up. Explain why Hund's rule is not important to follow for group 13, group 17 (halogens) or
group 18 (noble gas), but it is important for groups 14, 15, and 16.
Answer:
Groups 14, 15, and 16 have 2,3, and 4 electrons in the p sublevel (p sublevel has 3 "spaces" AKA orbitals), because Hunds says one in each orbital before doubling up if you had 2 electrons, group 14, they would both be in the first orbital, with 3 electrons, group 15, two in the first orbital one in the 2nd none in the 3rd. With 4 electrons, group 16, then you would have 2 in the first 2 orbitals and NONE in the 3rd.
Explanation:
If you are in group 13 you only have 1 electron so it can only be in one orbital. with group 17, you have 5 electrons, so 2 in the first 2 in the second and 1 in the 3rd, correct for Hunds rule anyway. Noble gasses, group 18, have 6 elecctrons, so every orbital is full any way you look at it.
A sample of oxygen gas at a pressure of 0.656 atm and a temperature of 27.2 °C, occupies a volume of 10.7 liters. If the gas is allowed to expand at constant temperature to a volume of 13.1 liters, the pressure of the gas sample will be ______ atm.
Fill in the blank.
Answer:
The correct answer is 0.536 atm.
Explanation:
The formula to use to solve the given question is,
P1V1 = P2V2
Based on the given information, the initial pressure (P1) of the oxygen gas is 0.656 atm, the initial volume (V1) is 10.7 L. The new volume (V2) given is 13.1 L, there is a need to find the new pressure of the gas (P2).
Now putting the values in the above equation we get,
0.656 atm * 10.7 L = P2 * 13.1 L
P2 = 0.656 atm*10.7 L/13.1 L
P2 = 0.536 atm
Write the information obtained from solubility curves.
Explanation:
The solubility curve helps us to compare the solubility of difference substances at same temperature. It gives the idea that solubility changes with the temperature. The solubility curve helps us to predict which substance will crystalize out first from hot solution containing two or more solutes.
How do you think engineers use the specific heat of various substances when they are designing new products?
Answer:
engineers use knowledge of heat of reaction to predict how much energy will be produced in a chemical system, which is important for keeping the reactor safe and efficient. Beyond chemical reactions, heat is exchanged for physical reactions, too.
A mixture of amino acids (written as M) was tested against five known amino acids (written as 1 to 5) and the chromatogram was made. Which amino acids are found in the mixture M?
I can’t see the picture
Explanation:
H2o has how many atoms in it? 1,2, or 3?
Which best describes the colors of visible light? Group of answer choices Red light has the longest wavelength and highest energy. Red light has the highest energy, and violet light has the longest wavelength. Violet light has the highest energy, and red light has the longest wavelength. Violet light has the longest wavelength and highest energy.
Answer:
Violet light has the highest energy, and red light has the longest wavelength
Explanation:
The correct answer would be that violet light has the highest energy, and red light has the longest wavelength.
Among the visible light rays, red has the shortest wavelength while violet has the longest. There is an inverse relationship between the energy and the wavelength of a wave. Hence, red light with the longest wavelength would have the lowest energy while violet light with the shortest wavelength would have the highest energy.
A 1.5 M solution of NaOH was made in a laboratory. If the solution made had a volume of 4.5 L, how many grams of NaOH were added?
Answer:
270g
Explanation:
Given parameters:
Concentration of solution = 1.5M
Volume of solution = 4.5L
Unknown:
Mass of NaOH added = ?
Solution:
Concentration is the number of moles of solute found in a solution.
To solve this problem, we need to find the number of moles of NaOH first;
Number of moles = concentration x volume
Number of moles = 1.5 x 4.5 = 6.75moles
Now, to find the mass of NaOH;
Mass of NaOH = number of moles x molar mass
Molar mass of NaOH = 23 + 16 + 1 = 40g
Mass of NaOH = 6.75 x 40 = 270g
HURRY!!!!!
____H2O + ____SO3 → ____H2SO4
Balanced?????
How far could you speed walk in 10 minutes based on the 8m trial
Answer:
The distance covered when speedwalking for 10 minutes based on the 8 meters trial (assuming a speed of 1 m/s) is 600 meters.
Explanation:
The speed of a body is the distance it covers per unit time when it travels. Its formula is given as; speed = distance/time. Its unit is meters per second as distance is measured in meters while time is measured in seconds.
From this formula, the distance covered by a body travelling with a given speed over a specific time can be determined. Distance = speed × time. This formula applies generally in all cases given the speed of the body and the time it travels.
Speed walking means walking as fast as possible without jogging or running. In this experiment, the speed over the 8 meters trial is not given. However, some assumptions can be made.
Assuming the speed while speedwalking is 1 meters per second; time taken = 10 mins or 10 × 60 seconds = 600 seconds. Distance covered = 1 m/s × 600 s = 600 m
Therefore, the distance covered when speedwalking for 10 minutes based on the 8 meters trial (assuming a speed of 1 m/s) is 600 meters.
Can someone help me please I’m giving the brainliest
What effect would lowering the temperature have on this reaction?
3H + N
2NH3 + energy
Answer:
B
Explanation:
Answer: H2 and M2 would react to produce more NH3
Explanation:
write the symbol of each neutral element based
on its Noble Gas Shorthand configuration:
[Ar]4'30
[Hel2s2p
TYPE
| Xolos