Please help
Which of the statement is false
What is the mass of 8.98 x 10^24 particles of CaCl2?
Answer:
1656.12grams
Explanation:
To calculate the mass of a substance in a particle, we need to calculate the number of moles (n).
n = nA × 6.02 × 10^23
nA = 8.98 x 10^24 particles
number of moles = 8.98 x 10^24 ÷ 6.02 × 10^23
n = 8.98/6.02 × 10^ (24 - 23)
n = 1.492 × 10^1
n = 14.92moles of CaCl2
Molar Mass of CaCl2 where Ca = 40g/mol, Cl = 35.5g/mol
CaCl2 = 40 + 35.5(2)
= 40 + 71
= 111g/mol
Using mole = mass/molar mass
mass = molar mass × mole
mass = 111 × 14.92
mass = 1656.12grams.
What is Environment Secretary ?!
Answer:
Environment Secretary can refer to:
Cabinet Secretary for Rural Affairs and the Environment, Scotland
Secretary for the Environment, Transport and Works, Hong Kong
Secretary of State for Environment, Food and Rural Affairs, United Kingdom
Secretary of the Environment (Mexico)
There are two suspects in a shooting investigation. Bullets are recovered from the crime scene. Both suspects own guns, and these guns have been seized by the police. How will the investigators check to see if one of these guns fired the found bullets?
Answer:
They can check if one of the bullets is gone if the gun was fully loaded or they can see if there is any particles of gun powder on the gun. I may be wrong.
have you ever seen a double
rainbow
Answer:
yes
Explanation:
what phase is carbon dioxide in at 5 atm pressure and -20 C
Answer:
When a solid turns directly to a gas this is called sublimation. From the graph it can be seen if the pressure is raised to ~5 atm as the CO2 warms up, it will pass through its triple point.
Explanation:
Answer:If the pressure is raised to ~5 atm as the CO2 warms up, it will pass through its triple point.
Explanation:
How much power is necessary to do 50 joules of work in 5 seconds?
Answer:
10 watts
Explanation:
Power = Work / time
Power = 50 J / 5 s
Power = 10 watts
The power that is necessary to do 50 joules of work in 5 seconds is 10 watts
What is power?Power is the amount of transfer of energy or converted per unit of time. Power is equal to energy divided by time. The SI unit of power is the watt. The three equations of power are:
P = Et.
P = Wt.
P = V2R.
Work is the transfer of energy from one body by the application of force. Work can be calculated by dividing force into displacement. Joule is the quantity by which work is calculated. The third equation will be used to calculate power.
There are different types of power that are used in doing work. They are legitimate, expert, reward, etc.
Given, 50 joules of work
Time is 5 seconds
Power = Work / time
Power = 50 J / 5 s
Power = 10 watts
Thus, the power is 10 watts.
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are aliens real? why or why not
Answer:
Yes
Explanation:
"a foreigner, especially one who is not a naturalized citizen of the country where they are living" is what we define as an alien
So we can say to ants we are aliens because we aren't a naturalized citizen in their country.
Answer:Yes aliens are real because the reason why i think this is because In the good old days, the arrival of UFOs on the front page of America’s paper of record might have seemed like a loose-thread tear right through the fabric of reality — the closest that secular, space-race America could have gotten to a Second Coming. Two decades ago, or three, or six, we would’ve also felt we knew the script in advance, thanks to the endless variations pop culture had played for us already: civilizational conflicts to mirror the real-world ones Americans had been imagining in terror since the beginning of the Cold War. And this is why i think aliens are real.
Explanation:Hope this helped also may i plz have brainlist?
In plant cells, how are chloroplasts and mitochondria related?
Answer:
Mitochondria are the "powerhouses" of the cell, breaking down fuel molecules and capturing energy in cellular respiration. Chloroplasts are found in plants and algae. They're responsible for capturing light energy to make sugars in photosynthesis.
PLS PLS HELP FAST When a pure substance is heated from 35.0°C to 50.0°C, it absorbs 5,200 J of energy. (50 g) What is the specific heat of the substance? You must show your work for full credit.
Answer:
6.93 J/g C
Explanation:
5200=50 g (15 C)x
5200=750x
Also I just took the test
How many grams are needed to prepare 750. mL of a 0.35 M solution of NaOH?
Answer:
10.5grams
Explanation:
Molarity = number of moles (n)/ volume (V)
According to this question;
Volume = 750 mL = 750/1000 = 0.75L
Molarity = 0.35M
number of moles (n) = molarity × volume
n = 0.35 × 0.75
n = 0.2625mol
Using mole = mass/molar mass
Molar Mass of NaOH = 23 + 16 + 1
= 40g/mol
mole = mass/molar mass
0.2625 = mass/40
mass = 10.5grams
10.5 grams are needed to prepare 0.75L of a 0.35 M solution of NaOH.
what volume is needed to make a 2.45 M solution of KCl using 0.50 mol of KCl
The molarity of a substance is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:
[tex]Molarity = \frac{mole}{volume }[/tex]
From the question given above, the following data were obtained:
Molarity of KCl = 2.45 M
Mole of KCl = 0.5 mole
Volume =?The volume of KCl needed can be obtained as follow:
[tex]Molarity = \frac{mole}{volume }\\\\2.45 = \frac{0.5}{Volume }[/tex]
Cross multiply
2.45 × Volume = 0.5
Divide both side by 2.45
[tex]Volume = \frac{0.5}{2.45}\\[/tex]
Volume = 0.20 LTherefore, 0.20 L is needed to make the solution.
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Which squirrel do you think is better suited for the environment, the gray one or the white one? and why
Answer:
The grey squirrel.
Explanation:
This is your answer because the white one would have a harder time to blend in with the tree's and the environment, whilst the grey one is better suited for its environment better due to the fact that it can blend in with the trees, and hide better.
A. How many bonds are between hydrogen and chlorine?
Explanation:
yes, chlorine and hydrogen form a polar covalent bond. Chlorine has a quantity of 7 electrons and hydrogen has only 1 electron, for this reason an unequal bond will form, that is, it will be uneven in distribution.
✧◝(⁰▿⁰)◜✧
What geologic process could have formed the channel on Mars?
Answer:
How can we decide which geologic process formed the channel on Mars? Students figure out: The channel on Mars was probably formed by water. The rover Curiosity found rocks near the channel that were made up of many smaller rocks.
Explanation:
Hope it helps! Correct me if I am wrong :>
Can you please mark me as brainlest?
Answer:Water
Explanation:
Water could have formed the channel on Mars because some of the rocks that scientists studied from the earth looks similar to the rocks on Mars.
2CO + O2 --> 2CO2
What is the coefficient of carbon dioxide?
Answer:
2 is the coefficient of CO₂Explanation:
The coefficient is the number in front of a substance that indicates how many molecules or atoms are. For example, when we see 5He, it shows that there are 5 atoms of helium. When we see 5H₂O, it indicates that there are 5 molecules of water, each having 2 atoms of hydrogen and 1 atom of oxygen, so a total of 10 hydrogen atoms and 5 oxygen atoms.
When cooling a gas, what type of physical change will occur?(2 points)
It will boil.
It will condense.
It will freeze.
It will melt.
Answer:
It will condense.
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5.08 moles of an ideal gas are contained in a 3000-mL container at a temperature of 25 °C. What pressure does the gas exert, in mm Hg, on the container?
Answer:
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeiiiiiieeeeeemmmmmmmmiemeeeeeiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiimiiiimmmmmmmmmmmmmmmmmmmiimmiimiiiiiiiimiiiiiimmii
Explanation:
HELPPPPPPPPPPPPPP
If 300 rats are each given an LD50 dose of 3 000mg, what do you expect to happen
Answer:
LD50 is the amount of a material, given all at once, which causes the death of 50% ... LD100 Lethal dose for 100% of the animal test population ... Researchers can do the test with any animal species but they use rats or mice ... quoted as parts per million (ppm) or milligrams per cubic metre
Explanation: hope this helps :)
Which gas would have the fastest rate of diffusion, assuming all of the gases are at the same temperature?
-Ar
-Ne
-He
-Kr
Answer:
Its Neon
Explanation:
Why ? Because Neon is the fastest it can go to 435 m/s and thats one of the fastest element there.
Helium would have the fastest rate of diffusion. Therefore, option (C) is correct.
What is Graham's law?Graham’s law states that the rate of diffusion of a gas is inversely proportional to the square root of the molecular weight of that gas.
According to Graham’s Law, molecules of gas with lower molecular mass at constant pressure and temperature will diffuse faster than the higher molecular mass molecules. This formula is commonly utilized to compare the rates of diffusion of two different gases at the same pressures and temperatures.
[tex]\frac{Rate_1}{Rate_2} =\sqrt{\frac{M_2}{M_1} }[/tex]
Where M₁ is the molar mass of gas 1 while M₂ is the molar mass of gas 2.
The atomic mass of He, Ne, Ar, and Ke is 4, 20, 40, and 83 g/mol. The helium gas has the lowest atomic mass so it has the highest rate of diffusion while Krypton has the lowest rate of diffusion.
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HELP ME ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Digestive
Explanation:
Which of the following is true of a limiting reagent? I. It is a reactant II. It limits the amount of product formed III. It determines the maximum amount of product formed.
Answer:
In other words, the hot dog buns limit the number of complete hot dogs we can produce. ... The amount of a product that is formed when the limiting reactant is fully ... the limiting reactant and calculate the theoretical yield for an actual chemical reaction. ... Method 1: For the first method, we'll determine the limiting reactant by ...
Explanation:
Regarding the limiting reagent, it is true that:
I. It is a reactant.II. It limits the amount of product formed.III. It determines the maximum amount of product formed. What are the limiting reagent and the excess reagent?The limiting reagent in a chemical reaction is the reactant that will be consumed completely.The excess reagent is the reactant that could keep reacting if the other had not been consumed.Which of the following is true of a limiting reagent?
I. It is a reactant. True. The limiting reagent is always a reactant. II. It limits the amount of product formed. True. Once the limiting reagent is consumed, the reaction stops. III. It determines the maximum amount of product formed. True. Once it is consumed, no more product is formed.Regarding the limiting reagent, it is true that:
I. It is a reactant.II. It limits the amount of product formed.III. It determines the maximum amount of product formed.Learn more about the limiting reagent here: https://brainly.com/question/24945784
how many kg of solvent would contain 130 grams of ZnBr2 if the solution was 0.950 grams
Answer:
0.00731 kg
Explanation:
Given that solution is a product of solute and solvent.
Hence, solution = solute * solvent
In this case, the solution is given as 0.950 grams = 0.00095 kilograms
solute is given as 130 grams = 0.13 kilograms
Hence to get the amount of solvent in kilograms, we have
Solution ÷ Solute => 0.00095 ÷ 0.13
= 0.0073076923
=> 0.00731 kilograms
Would the primary consumers, secondary consumers, or tertiary consumers have more total mass?
Answer:
primary
Explanation:
Which of the following does not describe DNA?
Answer:
D
Explanation:
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89. What is the pressure of a fixed volume of a gas at 30.0C if it has a pressure of 1.11atm at 15C?
0.555 atm is the pressure of a fixed volume of a gas at 30.0C if it has a pressure of 1.11atm at 15C.
What is an ideal gas equation?The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas.
According to Ideal Gas Equation,
PV = nRT
Therefore, P ∝ T
P₁T₂ = P₂T₁
Given :
P₁ = ?
P₂ = 1.11 atm
T₁ = 30.0 C
T₂ = 15 C
Solving :
P₁ x 30 = 1.11 x 15
P₂ = 0.555 atm
Hence, 0.555 atm is the pressure of a fixed volume of a gas at 30.0C if it has a pressure of 1.11atm at 15C.
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If a chemical reaction occurs, the properties of substances before and after the substances interact must be
Answer:
different
Explanation:
A chemical reaction may be defined as the process or method by which a substance undergo a change in their structure chemically when reacting with some other substance and acquiring the property of both or sometimes forms a new substance. It leads to the chemical transformation of the chemical substance to some another substance.
The properties of the new substance formed is different form the parent substance before the reaction.
Thus, when chemical reaction occurs, the properties of the substances before the reaction and after the reaction takes place is different.
Which mass is made up of 6.02x10^23 atoms? none of these 23 g sodium 42 g krypton 24 g carbon 78 g potassium
Answer:
23 g sodium
Explanation:
In chemistry, one mol (1mol) of a substance equals Avagadro's number or constant (6.02 × 10^23 atoms/particles/molecules).
According to this question in which the mass of different elements were given, the mass of the element that equals 6.02 × 10^23
Using the formula; mole = mass/molar mass
- Sodium = 23g/23g/mol = 1mol
- Krypton = 42g/84g/mol = 0.5mol
- Carbon = 24g/12g/mol = 2mol
- Pottasium = 78g/39g/mol = 2mol
Therefore, from the above illustration, it can be observed that only 23g of sodium contains 1 mol, hence, 23g sodium contains 6.02 × 10^23 atoms.
plz answer quick it had to be done before 12!! (What planet has the hottest average temperature? A. Venus, B. Earth, C. Neptune, D Jupiter)
Answer:
A, Venus.
Explanation:
Temperatures reach up to 460° C on a regular basis.
How did mitochondria
become part of the cell?
Answer: The mitochondria, as bacteria, only wanted to rob the host cells of their energy and then leave them to die. But the bacteria soon realized the benefit of working together with simple cells. The simple cells provide them with antioxidants to protect them from free radicals and toxic reactive oxygen species that the mitochondria generate as a byproduct of energy production.
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