How many protons would an astatine atom have after emitting
an
alpha particles?
Answer:
Astatine is of interest as a cancer therapy because it is one of several elements that emit an α particle—a combination of two protons and two neutrons—when it decays.
Explanation:
how many atoms are there in 1g of argon the Avogadro constant is 6.02 x 10^23 per mole relative atomic mass (Ar): AR=40
Answer:
ow many atoms are there in 1g of argon the Avogadro constant is 6.02 x 10^23 per mole relative atomic mass (Ar): AR=40Explanation:
The number of atoms of argon in 1g of argon is 1.5 × 10²² atoms
From the question,
We are to determine the number of atoms present in 1g of argon.
To determine this,
First we will calculate the number of moles of the 1g of argon
From the formula
[tex]Number\ of\ moles = \frac{Mass}{Atomic\ mass}[/tex]
From the given information
Mass of Argon = 1g
Atomic mass of Argon = 40g/mol
∴ Number of moles of Argon = [tex]\frac{1}{40}[/tex]
Number of mole of Argon = 0.025 mole
Now,
For the number of atoms of argon present
Using the formula
Number of atoms = Number of moles × Avogadro's constant
∴ Number of atoms of argon present = 0.025 × 6.022×10²³
Number of atoms of argon present = 1.5055 × 10²² atoms
Number of atoms of argon present ≅ 1.5 × 10²² atoms
Hence, the number of atoms of argon in 1g of argon is 1.5 × 10²² atoms
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Please help due today
What is the chemical name of the compound Cu(NO3)2? Use the list of polyatomic ions and the periodic table to help you answer.
A.
copper nitrate
B.
copper nitride
C.
copper(II) nitrate
D.
copper(IV) nitrate
E.
copper(IV) nitrite
Answer:
Cooper (||) nitrate
Explanation:
I got it right in edmentum
The chemical name of the compound Cu ( NO₃ ) ₂ copper ( II ) nitrate. Therefore, option C is correct.
What is copper nitrate ?Any member of the family of inorganic compounds with the formula Cu ( NO₃ ) ₂ x is referred to as copper(II) nitrate. Blue solids make up the hydrates. At 150–200 °C, anhydrous copper nitrate sublimes into blue–green crystals. Hemipentahydrate and trihydrate are typical hydrates.
A bluish-green, tasteless, crystalline substance that resembles sand is cupric nitrate. It is employed in pyrotechnics, electronics, electroplating, textile dyeing, medicines, electroplating, insecticides, and light-sensitive materials.
Some pyrotechnics contain copper nitrates. Chemical voltaic cell reactions are frequently demonstrated using it in educational laboratories. It is an ingredient in various metal patinas and ceramic glazes.
Thus, option C is correct.
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Name a salt which does not contain water of crystallisation
Answer:
sodium nitrate ,potassium chloride ,potassium nitrate and barium sulphate are the salts which does not contain water of crystallization9.25x10^-8 x6.40x10^3 in scientific equation
Answer:
5.92E-4 or 5.92x10^-4
Explanation:
HELP ME PLEASE !!! I.D.K WHAT TO DO :((( Will mark brainliest please !!
Answer:
bri me jose my new account
Explanation:
HELP PLEASE!!! FIRST PERSON TO ANSWER GETS 90 POINTS AND MARKED BRAINLIEST!
Answer:
MgO has a highest melting point
C5Br has lowesst
Explanation:
It takes a lot of energy to overcome the strong electrostatic forces of attraction between oppositely charged ions, so ionic compounds have high melting and boiling points. ... Magnesium oxide is made from ions with two charges (Mg 2+ and O 2-) and so has a much higher melting point of 2852°C.
what should we use in soap making process:-
a) potassium hydroxide
b) sodium hydroxide (lye)
Explain why it should be used
Answer:
a) potassium hydroxide
Explanation:
Potassium Hydroxide is a type of lye specifically used to make liquid soap.
Sodium hydroxide(lye) is used to unclog drains.
Hope this helps plz hit the crown :D
Mass Number
19
Atomic Number
Elements
Fluorine
Neon
Aluminium
Phosphorus
10
13
15
a. i. Which of the elements would not be capable of forming compounds
Answer:
Explanation:
The atomic number is the number of protons inside the nucleus of an atom. ... 1.1% carbon 13 with 7 neutrons and a mass of 13.00335 u (measured), and a ... The value given is the mass number of the most stable isotope of that element. ... That's because the chemistry of helium is more like neon (Ne), argon (Ar), etc.
What can you find on the periodic table?
A. the chemical formula for salt
B. the number of hydrogen atoms that are in a molecule of water
C. all the compounds that exist in the universe
D. all the elements that have been discovered
Gina made a poster for plastic recycling week and included this information on her poster:
A 2-column table with 3 rows. The first column labeled natural has entries cellulose, rubber tires, D N A. The second column labeled synthetic has entries plastic, starch, nylon.
What corrections should Gina make? Check all that apply.
Gina should put “cellulose” under “Synthetic.”
Gina should put “plastic” under “Natural.”
Gina should put “rubber tires” under “Synthetic.”
Gina should put “starch” under “Natural.”
Answer:
Gina Should Put Rubber Tires Under The Synthetic Category
Gina Should Put Starch Under The Natural Category
Explanation:
Edge 2020
Answer:
Gina Should Put Rubber Tires Under The Synthetic Category...(C)
Gina Should Put Starch Under The Natural Category...(D)
Explanation:
hope this helps. the person above me is also correct
4. Why does liquid water take on the shape of a cup it is poured into, but solid ice cubes do
not?
A. liquid water molecules are softer than solid ice molecules
B. liquid water molecules are smaller than solid ice molecules
C. liquid water molecules are moving but the solid ice molecules are not
D. liquid water molecules can easily move past one another but the
molecules of solid ice cannot
Answer:
D
Explanation:
I just took the final on Biology and got that right.
Which way of preparing food models a physical change that happens to food within the digestive system?
Select one:
Freezing juice in an ice-pop mold
Frying an egg in a skillet
Grinding fruit in a blender
Burning a marshmallow over a flame
Answer:
im pretty sure its Frying an egg in a skillet
im so sry if im wrong have a nice day/night (:
if a bowing ball hits a wall with a force of 6 N, the wall exerts a force of ____ back on the bowing ball
Α. 0N
B. 3N
C. 6N
D. 12N
Answer:
A
Explanation:
good luck
CaO + H2O -> Ca(OH)2
3.50g of Ca(OH)2 was made from 4.20g of CaO? What is the % yield of Ca(OH)2?
The % yield of Ca(OH)₂ : 62.98%
Further eplanationPercent yield is the compare of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
Reaction
CaO + H₂O ⇒ Ca(OH)₂
mass CaO= 4.2 g
mol CaO(MW=56,0774 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{4.2}{56,0774 g/mol}\\\\mol=0.075[/tex]
mol Ca(OH)₂ based on mol CaO
mol ratio CaO : Ca(OH)₂,= 1 : 1, so mol Ca(OH)₂ = 0.075
mass Ca(OH)₂(MW=74,093 g/mol) ⇒ theoretical
[tex]\tt mass=mol\times MW\\\\mass=0.075\times 74,093 g/mol\\\\mass=5.557~g[/tex]
% yield :
[tex]\tt =\dfrac{actual}{theoretical}\times 100\%\\\\=\dfrac{3.5}{5.557}\times 100\%\\\\=62.98\%[/tex]
What is a Conclusion?
A. What you figure out by doing an experiment
B. the group that does not take part in the Experiment
C. The data that you record during an Experiment
D. What you think is going to happen in an Experiment.
Answer:
A
Explanation:
using process of elimination, B would be, and I forget, but I think it's the controlled variable or one type of variable. C would be analysis or just data I guess. and D would be hypothesis
What Phase is water at 120 degrees Celsius?
Gizmo Student Exploration: Periodic Trends
Does anyone have the answer key?
Answer:
No
Explanation:
I dont at least but you may be lucky
To make a balanced equation, 6 H2O + 6 CO2 ---> C6H12O6 + _
Answer:
6O₂
General Formulas and Concepts:
Chemistry/Biology
Photosynthesis Equation: 6H₂O + 6CO₂ → C₆H₁₂O₆ + 6O₂Explanation:
Most of the equation comes from the Photosynthesis Equation. Plants take in water and carbon dioxide and sunlight (energy) to produce glucose and oxygen. When we balance the equation and predict reaction. we should get 6O₂ as our answer.
There was a large population of woodpeckers living in a forest. Some of the woodpeckers had long beaks, some of the woodpeckers had short beaks. During a very rainy year, the bark on most of the trees grew very thick. Only the woodpeckers with the longest, strongest beaks could drill deep enough into the thick bark to find the insects they depend upon for food. Woodpeckers with short beaks could not drill in deep enough to reach the insects. If the rainy weather continues for several years, what do you expect would happen to the woodpecker population because of natural selection?
Answer:
The woodpecker population would start to decrease because of natural selection
Explanation:
In a laboratory demonstration, a balloon filled with methane and oxygen was exposed to a flame. The result was a brief, large flame. The students were asked to formulate an equation for the reaction. One answer is below. (3 points) Is this equation correct? Explain your reasoning.
Answer:
CH4(g) + 2O2(g) -------> CO2(g) + 2H2O(g)
Explanation:
Even though the question is incomplete because the equations are missing. However, one thing that is clear from the question is that the reaction is a combustion reaction.
A combustion reaction is a type of reaction that produces heat and light. The mixture of methane and oxygen yielded a brief, large flame which shows that combustion has taken place according to the equation shown above.
What must occur in order for matter to change states?
A.
A chemical change must occur.
В.
The temperature must change.
C. Heat must be added or removed.
D.
Other substances must be added.
Answer:
C. Heat must be added or removed
Explanation:
When matter changes states it is due to the overall loss or gain of heat. In addition, heat being added or removed is what will cause a temperature change, but a simple temperature change is not enough to change states. For example, a temperature could go from 50 degrees to 51. This will not cause a change in states. So heat must be added or removed in order for matter to change states.
You are asked to write observations about a 100g sample of Nitrogen-16 before it decays, but you’re running late. In order to make observations, you require at least .5g of material. Can you make observations if you are 57 seconds late to the lab?
You can't make observation because the minimum mass is not reached
Further explanationThe atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.
Usually radioactive elements have an unstable atomic nucleus.
The main particles are emitted by radioactive elements so that they generally decay are alpha (α), beta (β) and gamma (γ) particles
General formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]
T = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
Nitrogen-16 has a half-life of 7.1 s, so t1/2 = 7.1 s
T=duration of decay = 57 s
No= initial sample = 100 g
Nt expectes(at least) : 0.5 g
Amount of Nt after 57 s :
[tex]\tt Nt=100.\dfrac{1}{2}^{57/7.1}\\\\Nt=0.383~g[/tex]
So you can't make observation(0.383 < 0.5)
Which statement describes the water gas particles in the air above the cup compared with the water liquid
particles in the cup?
The partides move faster and are closer together
The particles move faster and are far apart
The particles move slower and are closer together
The particles move slower and are far apart
Answer:
The particles move faster and are far apart
Explanation:
A substance may exist in three states of matter; solid, liquid and gas.
In the solid state, there is very strong intermolecular forces between the particles of the substance. They can only vibrate or rotate about their mean positions but can not translate.
In the liquid state, the particles of the substance have a greater degree of freedom than in the solid. The magnitude of intermolecular forces is lower than in solids, the molecules can move at low speeds.
In a gas, the molecules are separated from each other with negligible intermolecular interaction hence they move at very high speed.
Therefore, for the water gas particles in the air above the cup; the particles move faster and are far apart.
reduces frictions creation of thermal energy
A: lubricant
B: electric heater
C: cell phone
Explain why only protons and neutrons are used to calculate mass number
Answer:
The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Together, the number of protons and the number of neutrons determine an element's mass number.
Which type of molecule forms structures in cells and stores energy? I NEED HELP
Answer:
Lipid forms structures in cells and stores energy
Explanation:
help me out pls and thank you
Answer:
4.58×10^2
Explanation:
3.8×10^2 = 380
4.2×10^3 = 4200
4200+380= 4580
What is a variable?
1.The factors that are the same in an experiment.
2.The factor that is different in an experiment.
Answer:
2. The factor that is different in an experiment.
Explanation:
a variable is able to change because it is an element, feature, or factor that is liable to vary or change