Answer:
it would be balanced forces.
Explanation:
Balanced forces acting on an object do not change the objects motion.
A. 207 kJ
B. 4730 kJ
C. 9460 kJ
D. 414 kJ
Answer:
Q = 9460 Kj
Explanation:
Given data:
Mass of copper = 2kg
Latent heat of vaporization = 4730 Kj/Kg
Energy required to vaporize 2kg copper = ?
Solution:
Equation
Q= mLvap
It is given that heat required to vaporize the one kilogram copper is 4730 Kj thus, for 2 kg
by putting values,
Q= 2kg × 4730 Kj/Kg
Q = 9460 Kj
The conversion factor 1 mol/6.02 × 1023 representative particles can be used to find the number of moles when the number of representative particles is known
true or false
relation between atomic number and frequency of radiation
Answer:
This law established a relationship between atomic number of element and frequency of X-rays of that atom. According to this law, the square root of frequency of X-rays imparted by elements is directly proportional to the atomic number of that element.
calculate the number of atoms in 2.5 mol manganese. show the steps and please don’t answer if you don’t know :)
Answer:
15.1 × 10²³ atoms
Explanation:
Given data:
Number of moles of manganese = 2.5 mol
Number of atoms = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.5 mol × 6.022 × 10²³ atoms / 1 mol
15.1 × 10²³ atoms
A hydrated sample of cobalt II chloride has a molar mass of 309.99 g/mol. What is the mole ratio between cobalt II chloride and water?
Explanation:
Let there be 1 mole of CoCl2.
Mass of CoCl2 = 1mol * (129.839g/mol) = 129.839g
Mass of H2O = 309.99g - 129.839g = 180.151g
Moles of H2O = 180.151g / (18g/mol) = 10mol
Hence the mole ratio of CoCl2 to H2O is 1 : 10.
Answer:
[tex]\boxed {\boxed {\sf 1 \ mole \ CoCl_2 \ to \ 10 \ mole \ H_2O}}[/tex]
Explanation:
First, identify the formula of cobalt II chloride: CoCl₂
Next, find the molar mass of CoCl₂. Identify the individual element's mass.
Cobalt (Co): 58.93319 g/molChlorine (Cl): 35.45 g/molSince there is a subscript of 2 after the Cl, we must multiply the molar mass of chlorine by 2
CoCl₂: (58.93319 g/mol) + (2* 35.45 g/mol) = (58.93319 g/mol)+(70.9 g/mol) 129.83319 g/molAssuming the sample is 1 mole, we can subtract the mass we just found from the hydrate sample's mass. This is the mass of the water.
309.99 g - 129.83319 g= 180.15681 gNow, we need to find the number of moles of water. Begin by finding the molar mass of water: H₂O
Hydrogen (H): 1.008 g/mol Oxygen (O): 15.999 g/molSince there is a subscript of 2 after the H, we must multiply the molar mass of hydrogen by 2.
H₂O: (1.008 g/mol *2)+ 15.999 g/mol = (2.016 g/mol)+(15.999 g/mol)=18.006 g/molFinally, divide the mass of the water by the molar mass of water.
180.15681 g / 18.006 g/molNote that the grams or g will cancel.
180.15681 / 18.006 mol = 10.00537654 molThis is roughly 10, so we can round to 10.
≈ 10 mol H₂OSo, the mole ratio is 1 mole CoCl₂ to 10 mole H₂O
explain why the chemical formula below is “balanced”.
2Cu + 02 -> 2CuO
a compound contains 64g of O and 8g of H. what is the empirical formula for this compound
Explanation:
Moles of Oxygen = 64/16 = 4
Moles of Hydrogen = 8/1 = 8
Hence the empirical formula is H2O.
How many Cl atoms are in Zn(ClO3)2?
O A. 2
O B. 1
O c. 3
O D. 6
There are two chlorine band six oxygen atoms in Zn ( ClO₃ )₂ molecule. Therefore, option A is correct.
What is chlorine atom ?With an atomic mass of 35.45 and an atomic number of 17, chlorine has an average of 17 protons, 17 electrons, and 18 neutrons in each of its atoms. Chlorine, which belongs to the halogen family on the Periodic Table, reacts vigorously with metals to produce salts.
Numerous industrial applications exist for chlorine as well. Including the production of plastics like PVC, solvents like tetrachloromethane, chloroform, and dichloromethane, as well as bulk goods like bleached paper products. In addition, it is utilized in the production of paints, textile colors, antiseptics, and pharmaceuticals.
Chlorine is a negative ion because it has a charge of 1, 1 more than protons. Atoms acquire or lose electrons during the formation of ions until their outer energy level is reached.
Thus, option A is correct.
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The gases in a hairspray can are at a temperature of 27 C and a pressure of 30 psi. if the gases can reach a pressure of 90 psi, the can will explode.To what Temperature must the gases be raised in order for the can to explode? You can assume volume remains constant..... please help!!!
The temperature for the can explode : 627 °C
Further explanationGay Lussac's Law
When the volume is not changed, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
T₁=27 C+273=300 K
P₁=30 psi
P₂=90 psi
[tex]\tt T_2=\dfrac{P_2\times T_1}{P_1}\\\\T_2=\dfrac{90\times 300}{30}\\\\T_2=900~K=627^oC[/tex]
Determine the LIMITING reactant in the following balanced equation:
2KBr + CI2 --> 2KCI+ Br2, when 4g of KBr react with 6 g of CI . MM(KBr)=
119 g/mol MM(CI2)=70 g/mol *
Answer:
KBr is limiting reactant.
Explanation:
Given data:
Mass of KBr =4g
Mass of Cl₂ = 6 g
Limiting reactant = ?
Solution:
Chemical equation:
2KBr + Cl₂ → 2KCl + Br₂
Number of moles of KBr:
Number of moles = mass/molar mass
Number of moles = 4 g/ 119 gmol
Number of moles = 0.03 mol
Number of moles of Cl₂:
Number of moles = mass/molar mass
Number of moles = 6 g/ 70 gmol
Number of moles = 0.09 mol
Now we will compare the moles of reactant with product.
KBr : KCl
2 : 2
0.03 : 0.03
KBr : Br₂
2 : 1
0.03 : 1/2×0.03= 0.015
Cl₂ : KCl
1 : 2
0.09 : 2/1×0.09 = 0.18
Cl₂ : Br₂
1 : 1
0.09 : 0.09
Less number of moles of product are formed by the KBr thus it will act as limiting reactant while Cl₂ is present in excess.
A 1500 W hair dyer is used to dry hair for 6 minutes a day for 3 days. How much energy is used?
Answer:
Since a 1W appliance will use 1 joule of energy every second, a 1500W appliance will use 1500 joules of energy every second. Hence, it will use 90000 joules of energy per minute, 540000 joules per 6 minutes (per day), and 1620000 joules of energy across all 3 days.
TL;DR 1620000 joules of energy would be used.
Explanation:
Hope this helped!
Question 10 of 32
Which of the following is an example of how the same chemicals used to
help people can harm the environment?
O A. Phosphates are removed from detergents so they don't end up in
drinking water.
B. Hillsides erode after plants are removed to clear a space for crops.
C. Plants grow back after toxic chemicals are removed from the
surrounding soil.
D. Excess fertilizers run off into rivers and create a dead zone.
SUBMIT
Answer:
D
Explanation:
The correct answer that gives a good example of how the same chemical used to help people can harm the environment would be when excess fertilizers run off into rivers and create a dead zone.
Fertilizers are usually applied to crops as an agricultural practice by farmers to enhance the yield of the crops and boost food or raw materials production. However, excess fertilizer gets washed into nearby water bodies and ends up creating a low-oxygen zone that is incapable of supporting lives within the water body - also known as dead zones.
The correct option is, therefore, D.
The climate in the temperate deciduous forest biome has four changing seasons with rain.
True
False
help me pleaseeee, ty if you doo:))
Answer:
9 is the correct answer
The process of burning a fossil fuel to release energy is called
Answer:combustion
Explanation:
which of the following best describes a decomposition reaction?
a. two substances combine to form a single new substance
b.two substances recombine to form two new substances
c. one element takes place of another in a compound
d. a single substance breaks down
Answer:
d.
Explanation:
because its right :)
The statement among the following which best describes a decomposition reaction is a Single complex substance breaks down in to two or more simpler substances.Hence, Option (D) is correct.
What is Decomposition Reaction ?Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments.
Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis.
Therefore, The statement among the following which best describes a decomposition reaction is a Single complex substance breaks down in to two or more simpler substances.Hence, Option (D) is correct.
Learn more about Decomposition reaction here ;
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The amount of resistance to a change in motion an object demonstrates is a direct function of its:
Answer:
Newton second law maybe?
A person who is recessive for eye color is crossed with a person who is also recessive for eye color.
What is the probability of them having a child who is dominant for eye color?
0%
0%
25%
25%
50%
50%
75%
75%
100%
What type of conservation tillage leaves the greatest amount of soil cover by crop residues? What are the advantages and disadvantages of this system?
Answer:
No-till conservation tillage
Explanation:
No till conservation involves the soil not being touched which gives rise to a large amount of organic matter being left on the surface.
The Advantage of this method is that it helps to prevent erosion such as that of wind and water due to the little or no exposure of the soil surface and helps to provide nutrients to the plants through the organic matter present.
The Disadvantage of this method is its heavy reliance of chemicals such as herbicides in killing the weeds in order to prevent competition for vital compounds with the main plants.
Pla helppp due in 5 minutes!!..
When a neutral atom gains or loses a proton, it becomes a(n)
*
Different Element
Isotope
lon
Neutral Atom
Answer:
Ion
Explanation:
I'm pretty sure yhi
what do you understand by valency electron and valency shell?
Answer:
total no. of electron present in Valency shell is called valency electron ___________________valency shell is that in which last electron is present1. True or false, phosphorus-33 is an isotope
Explanation:
it's answer is false
hope it helps you
3. What determines that an element is a metal?
Answer:
if it forms from positive ions and has types of metallic bonds
Explanation:
why cant school just be poggers for once:(
Answer:
yes the schools should be poghers for once only:)
The simplest structures that can carry out all of the activities characteristic of life are
Answer:
Cells are the simplest structures that can carry out all of the characteristics activities of life.
Explanation:
All living things are made of cells and all cells come from other cells.
Find the product 78.3 times 0.45
Please help :(
Answer:
35.235
Explanation:
I plugged 78.3x0.45 it into a calculator
How many grams are in 56 L of chlorine gas?
Answer:
Since 1 L equals to 1000 microlitres, and 1 microlitre equals to 1 gram, there are 56 * 1000 = 56000 grams of chlorine gas in 56 L of chlorine gas.
Explanation:
Hope this helped!
the correct lewis dot structure for CaO?
Answer:
Here you go.
Explanation:
Hopefully it is not confusing.
what you could get from each meal and what you would need that nutrient for
Answer:
You can get calcium from foods and it helps to build strong bones. You can also get iron from food and it helps with blood health. Vitamin C and D3 are also common and help with immune health and D3 and biotin helps with the growth of hair, nails and skin health.
Explanation: