Answer:
About 7.0 × 10³ J or 7.0 kJ
Explanation:
We want to determine the amount of energy needed to raise the temperature of 67 grams of water from 20°C to 45°C.
We can use the heat equation:
[tex]\displaystyle q = mC\Delta T[/tex]
Where C is the specific heat of water.
Substitute and evaluate:
[tex]\displaystyle \begin{aligned} q & = (67\text{ g})\left(\frac{4.2\text{ J}}{\text{g-$^\circ$C}}\right)\left(45^\circ \text{ C}- 20.^\circ\text{ C}\right) \\ \\ & = (67\text{ g})\left(\frac{4.2\text{ J}}{\text{g-$^\circ$C}}\right)(25^\circ \text{ C}) \\ \\ & = 7.0\times 10^3 \text{ J}\end{aligned}[/tex]
Recall that there are 1000 J in a kJ. Hence:
[tex]\displaystyle \begin{aligned} q & = 7.0\times 10^3 \text{ J} \cdot \frac{1\text{ kJ}}{1000\text{ J}} \\ \\ & = 7.0 \text{ kJ}\end{aligned}[/tex]
In conclusion, it will take about 7.0 × 10³ J or 7.0 kJ of energy to raise the temperature of 67 grams of water from 20 °C to 45 °C.
Darren looks up at night and sees a bright object with a tail moving quickly across the sky. What is the most likely object that Darren saw? A. an asteroid B. a meteor C. a comet . D. a cupid
Answer:
A
Explanation:
asteroids most often leave trails due to the large amount of friction that occurs.
The bright spatial object with a tail moving fastly across the sky is called a comet. Comets are made of rock, dust and ices.
What are comets?Comets are orbiting snowballs around sun made of frozen gases, rock, and dust. They enlarge to the size of a sizable town when frozen. A comet heats up and ejects dust and gases into a huge, blazing head that is larger than most planets when its orbit puts it near to the Sun.
Millions of kilometers away from the sun, the dust and gas combine to form a tail. The Kuiper Belt and much further Oort cloud are presumably home to billions of comets that orbit our sun.
Some of their ice begins to melt and boil off as the comet approaches the sun, along with some dust. The coma, which is created by these particles and gases, surrounds the nucleus.
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How many valence electrons does the following isotope have?
Answer:
I have solution to your question
Nitrogen is 7th element in periodic table. It contains 7 electrons in which are 2 are inner electrons and 5 are outer electrons. Here N is in -3 oxidation state. Thus, it is having 8 valence electrons.
What is an isotopes?Isotopes of are atoms with same atomic number and different mass numbers. Almost every elements have isotopes but some of them are unstable in nature.
Atoms forms ions when they lose or gain electrons. Wen they lose electrons, they form positive ions called cations. When they gain electrons they form negative ions or anions.
Nitrogen is 7th element in periodic table. It has 7 electrons out which 2 are inner electrons and 5 are valence electrons. N needs 3 more electrons to attain octet. Thus it gains 3 electrons and forms its 3 - oxidation state.
Thus N in -3 oxidation state have 8 valence electrons.
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A mixture contains 220 mmHg of CO, 350 mmHg of Ne and 840 mmHg of He. What is the total pressure of the mixture
a
1.86 at
b
1.59 atm
c
1.46 atm
d
none of these
Considering the Dalton's partial pressure, the correct answer is option a.: the total pressure of the mixture is 1.86 atm.
The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
[tex]P_{T} =P_{1} +P_{2} +...+P_{n}[/tex]
where n is the amount of gases present in the sample.
This relationship is due to the assumption that there are no attractive forces between the gases.
In this case, a mixture contains 220 mmHg of CO, 350 mmHg of Ne and 840 mmHg of He. The total pressure of the mixture can be calculated as:
[tex]P_{T} =P_{CO} +P_{Ne} +P_{He}[/tex]
[tex]P_{T} =220 mmHg +350 mmHg+840 mmHg[/tex]
Solving:
[tex]P_{T}[/tex]= 1410 mmHg
Being 760 mmHg=1 atm, then:
[tex]P_{T}=1410 mmHgx\frac{1 atm}{760 mmHg}[/tex]
Solving:
[tex]P_{T}[/tex]= 1.86 atm
Finally, the correct answer is option a.: the total pressure of the mixture is 1.86 atm.
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brainly.com/question/14239096?referrer=searchResults brainly.com/question/25181467?referrer=searchResults brainly.com/question/14119417Covalent compounds are generally not very hard. Justify the statement.
Covalent compounds are generally not very hard because they are formed by two or more nonmetallic atoms.
COVALENT COMPOUNDS:Covalent compounds are compounds whose constituent elements are joined together by covalent bonds.
Covalent bonding occurs when two or more nonmetallic atoms of an element share valence electrons. This means that covalent compounds will not be physically hard since they constitute non-metals.
Examples of covalent compounds are:
H2 - hydrogenH2O - waterHCl - hydrogen chlorideCH4 - methaneLearn more about covalent compounds at: https://brainly.com/question/21505413
Heart, 5 stars, and Brainiest to first right answer!
Which climate condition is typically found in the tropics due to the interaction of the atmosphere and hydrosphere?
A.Dry with low humidity
B.Dry with high humidity
C.Wet with high humidity
D.Stormy with low humidity
Answer:
A- Dry with low humidity
Explanation:
The hydrosphere includes the water which is on the surface of the earth, below the ground and in the air.
On analyzing the climatic conditions in the tropics due to the interaction of the atmosphere and hydrosphere, the presence of water droplets in tropics is less resulting in less humidity and, thus the climatic condition is dry.
Therefore the climatic condition that is typically found in tropics due to interaction of the atmosphere and hydrosphere is dry with low humidity.
Hope this helps!
PLEASE HELP WILL GIVE BRAINLIEST
Answer:
55 centimeters
Explanation:
20+15+25
WHICH ONE?????????????????? Brainlest
Answer:
I believe it would be C, The number of atoms in the reactants is equal to the number of atoms composing the products
Explanation:
hope this helps! :D
have a miraculous day!! <3
Answer:
The number of atoms in the reactants is equal to the number of atoms composing the products
Select True or False: Consider the reaction N2(g) 3H2(g) 2NH3(g). The production of ammonia is an exothermic reaction. When heat is added to the equilibrium system it will shift to increase the amount of ammonia produced.
Answer:
False
Explanation:
As I like to think of it, equilibrium will shift either 'forwards' (to increase products) or 'backwards' (to increase reactants) to oppose any change in system;
If heat is added, the equilibrium will shift in the direction that reduces heat within the system;
In other words, it will shift in favour of the endothermic reaction, i.e. the reaction where heat is gained by the molecules/atoms and therefore taken out from the system;
If the 'forwards' reaction, producing NH₃, is exothermic (i.e. energy is released in the reaction), then the 'backwards' reaction is endothermic;
So the equilibrium will shift in this direction, which is the reaction of 2 NH₃ molecules producing N₂ and 3 H₂
1. Which of the following shows the process of freezing?'
A.candle wax cooling on the table
B.pouring cola over ice
C.heating a cup of water
D.particles are speeding-up and colliding more
Help asap plzzzzz!!!!!!!!!!!!!
Answer:
Water will generally require more energy for a phase change compared to a similar substance without hydrogen bonds.
Explanation:
In times of hot, dry, weather, some cities ban the use of garden sprinklers. Why is there such a rule
Answer:
These weather conditions are consistent with droughts, often characterized by hot, dry, weather. When this is the case, it is important to conserve water and use it only for necessities. Garden sprinklers are not essential, so their use can be sacrificed in order to provide more crucial services, such as drinking water. This rule has been put in place in order to avoid water shortages and energy crises, events that would be even more damaging during an emergency.
All of the following compounds are soluble in water EXCEPT
a
MgSO4
b
Ca(NO3)2
с
Agi
d
K2CO3
Answer:
Anser is C Agl
Explanation:
Agl does not dissolve in water.
All of the following compounds are soluble in water except AgI because of very high value of lattice energy. Therefore, the correct option is option C.
The capacity of a material, the solute, to combine with a different material, the solvent, is known as solubility in chemistry. Insolubility, or the solute's inability to create such a solution, is the opposite attribute. The concentration for the solute within a saturated solution—a solution where no more of the substance can be dissolved—is typically used to gauge the degree of a substance's solubility in a particular solvent. The two compounds are considered to be at the point of solubility equilibrium at this time. All of the following compounds are soluble in water except AgI because of very high value of lattice energy.
Therefore, the correct option is option C.
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why is extra vitamin C excreted in urine from the body but vitamin A in excess is retained in the body
Answer:
Vitamin C is water-soluble and not stored in your body
In contrast to fat-soluble vitamins, water-soluble vitamins do not get stored within the body. Instead, the vitamin C that you consume gets transported to your tissues via body fluids, and any extra gets excreted in urine ( 1 ).
Answer:
The reason vitamin C isn't stored well is because your body can't make it, and vitamin C is a water-soluble vitamin. This means it dissolves in water, and what your body doesn't use right away is excreted through urine. Thus, it is not stored in our body to a significant extent.
Explanation:
If you add the same amount of heat to two different substances, will they both change phase?
Answer:
It depends on their melting and/or their boiling points, because the heat provides the particles with kinetic energy to break the electrosatic bonds in the substances, which can differ in strength
Explanation:
Determine the structure for a compound Z with formula C10H803.
i think it's a simple covalent structure
1.
Light is a(n) _______wave.
Group of answer choices
A. longitudinal
B. large
C. ocean
D. transverse
Answer: D. transverse
Explanation:
Light is a transverse wave, while sound is a longitudinal wave.
explain how materials are suited for different uses based on their physical and chemical properties?
-- --- .-. ... . / -.-. --- -.. . / .. ... -. .----. - / - .... .- - / ..-. ..- -. / .- -. -.. / .. .----. -- / ..- ... .. -. --. / .- / - .-. .- -. ... .-.. .- - --- .-. / - --- --- / ... --- what did I say in Morse code?
Answer:
MORSE CODE ISN'T THAT FUN AND I'M USING A TRANSLATOR TOO SO
Explanation:
That is what is says in morse code.
Answer:
MORSE CODE ISN'T THAT FUN AND I'M USING A TRANSLATOR TOO SO
Explanation:
Electrolysis Is One of the Modern Technologies in Architecture’ Prepare an Investigatory Report That Supports the Statement”.
Electrolysis is a technique that separates natural elements. It is commercially used to obtain important materials (e.g., pure metals) for construction.
Electrolysis refers to the use of an electric current to trigger non-spontaneous chemical reactions.
This technology (electrolysis) is commercially important in industry, construction and therefore also in architecture in order to extract metals and minerals from the ground.
Electrolysis uses particular electrolytic cells in order to extract highly pure metals from ores.
Learn more about electrolysis here:
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Answer: Electrolysis is a technique that separates natural elements. It is commercially used to obtain important materials (e.g., pure metals) for construction.
Electrolysis refers to the use of an electric current to trigger non-spontaneous chemical reactions.
This technology (electrolysis) is commercially important in industry, construction and therefore also in architecture in order to extract metals and minerals from the ground.
Electrolysis uses particular electrolytic cells in order to extract highly pure metals from ores.
Learn more about electrolysis here:
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Calculate the wavelength of X-rays of frequency 5.00 x 100 Hz (Hz=Hertz=cycles/sec).
a) 1.20 nm
b) 0.398 nm
C) 0.600 m
d) 1.20 m
e) 0.600 nm
Answer:
no correct answer please mention other answers.
wavelength=30000000/frequency
In the chemical stockroom, there is a 0.500 L bottle filled with 2.30 M CuSO4 solution. How many moles of CuSO4 are in the bottle?
A. 0.217 moles
B. 4.60 moles
C. 01.15 moles
D. 1.80 moles
The number of moles of the solute in the solution is the product of its volume and molarity. The number of moles of copper sulphate in 0.500 L of 2.30 M solution is 1.15 moles.
What is molarity?Molarity of a solution is the common term used to represent the concentration of a solution. It is the ratio of its number of moles of solute to the volume of solution in liters.
Molarity = no.of moles/volume in L.
Molarity is a temperature dependant quantity.
The given solution has a volume of 0.500 L.
molarity of copper sulphate solution = 2.30 M
Thus, number of moles of copper sulphate solute dissolved in 0.50 L of water is calculated by multiplying the volume with molarity.
No. of. moles of copper sulphate = molarity × volume
= 0.500 L × 2.30 M = 1.15 moles.
Therefore, there will be 1.15 moles of copper sulphate in the solution.
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4) If an object is traveling at a speed of 400 m/s, how long (in hours) will it take to reach 950.5 km?
A) 3.96 x 10-2
B) 1.43 x 105
C) 6.34
D) 39.6
E) 7.01 x 10-6
Answer:
Answer: 0.66 hours
Explanation:
[tex]{ \rm{time = \frac{distance}{speed} }} \\ \\ { \rm{time = \frac{(950.5 \times 1000) \: m}{400 \: m {s}^{ - 1} } }} \\ \\ { \rm{time = {2376.25 \: s}}}[/tex]
• Remember 1 second accounts for 1/3600 hours
[tex]{ \rm{time = \frac{2376.25}{3600} }} \\ \\ { \rm{time = 0.66 \: hours}}[/tex]
The time taken by object traveling at a speed of 400 m/s to reach 950.5 km distance is 0.66 hr or 39.6 min.
What is average velocity ?
Average velocity is given by the total distance covered by the object in total given time. SI unit of velocity is m/s.
Here in this question it is given that the object is travelling with speed v of 400 m/s and it is to find the time t to reach 950.5 km distance d.
it is known that 1 km = 1000 m
that is 950.5 km = 950500 m
Now, using the relation of speed-distance to find time t to reach 950.5 km distance :
[tex]\begin{aligned}v&=\frac{d}{t}\\t&=\frac{d}{v}\\&=\frac{950500}{400}\\&=2376.25 \text{ s}\end{aligned}[/tex]
Now converting 2376.25 sec into hrs by dividing it by 3600 we get :
2376.25/3600 = 0.66 hr or 39.6 min.
Therefore, the time taken by object to reach 950.5 km distance is 0.66 hr or 39.6 min.
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Determine the number of moles in 4.9*10 raise to the power of 24 of Ag
Answer:
4.5425806678891E+22mol
Explanation:
Which population will increase?
Answer: World 5,306,425,000 6,895,889,000 7,503,828,180
1 China 1,139,060,000 1,341,335,000 1,384,688,986
2 India 873,785,000 1,224,614,000 1,296,834,042
3 United States 253,339,000 310,384,000 329,256,465
Explanation:
A student wants to determine the melting point of water as part of an investigation into the strength of electrostatic forces. The student considers determining the freezing point of water instead. Is this a valid option?
According to the forces of attraction freezing point and boiling point of water are different and are not related to strength of electrostatic forces.
What are forces of attraction?
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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- 5. Venus is like Earth because A. They both have oceans, air, and plant life. B. They both have people living on them. C. They are about the same size and have about the same amount of gravity.
Answer:
C
Explanation:
Answer:
c
Explanation:
Venus and Earth are often called twins because they are similar in size, mass, density, composition and gravity. Venus is actually only a little bit smaller than our home planet, with a mass about 80% of Earth's.
1) Convert the following:
900g to kg
2.87L to uL
Answer:
0.9 kg
2870000 uL
there is a conversion calculator online
4. The new element Plainsmenium (Pe) was discovered in 2005 by Monte E. Rey
(who will receive his Nobel Prize in Chemistry in the year 2012). It has
three isotopes: Pe-184 (24.60%), Pe-185 (11.20%), and Pe-188 (64.20%).
What is its average atomic mass?
This is my answer
Explanation:
p=m/v
where:. p=density
m=mass
v=volume
p=F/A = Lim ∆F / ∆A
1 ATM=14.7 psi
= 1.013x10⁶ d/cm²
1 bar=10⁶ d/cm²
=10⁵ N/m2
Hope it helps to you goodluck
I'm not sure but that's the answer of my notebook like my answer please
How much heat must be added to a 8.21 g sample of gold to increase its temperature from the tempe
75.3°C to 83.1°C? The specific heat of gold is 0.13 J/gºC
Answer:
Q= ms∆T
Where, m is mass of substance
S is specific heat
∆T is temperature change
As in question , m=8.21 ,s=0.13 ,∆T =6.2
So, Q = 8.21×0.13×6.2=6.61 J
How many theoretical plates produce a chromatography peak eluting at 12.83 min with a width at half-height of 8.7 s