Answer:
d. The correct answer for your questions is Sr<Ca<Be
Answer:
Answer:- choice d is correct. Sr<Ca<Be .
Explanations:- Br, Ca, and Sr are all elements of same group as they all have 2 valence electrons. As we move down in a group, a new shell is being added that increases the size of the atom. As the size of an atom increases, it is easy to remove the electron from it's outer most shell in it's gaseous state. Since, Be is above Ca and Ca is above Sr. The size increases in the order, Be < Ca < Sr. It means Be is the smallest one of them and so it's hard to remove from it's outer most shell and hence it's ionization energy is higher.
Sr is largest one in these three elements and so it's easy to remove outer most electron from it that means the ionization energy is least. Ca is between Be and Sr.
So, an increasing order of ionization energy is Sr<Ca<Be . Choice D is correct.
Al + Fe2O3 --> Al2O3 + Fe
How many grams of Al2O3 would be produced when 10.0 grams of Al is reacted with an excess supply of Fe2O3? You must show work to get full credit.
Answer:
18.88 grams of Al2O3
Explanation:
Here's my work
10g Al l 1 mol Al l 1 mol Al2O3 l 102g Al2O3
l 27g Al l 2 mol Al l 1 mol Al2O3
Balanced equation: 2Al +Fe2O3 --> Al2O3 + 2Fe
So pretend it's in a chart, you fill it out starting from the top left corner and then moving diagonally down and then straight up and then diagonally down and the straight up, etc. You start with 10 grams of Al, so the first thing you want to do is convert it into moles. So you find the mass of Al(which is 27) and then you have 1 mol of Al on top. So the next thing you have to do is to change it to Al2O3 since that is what the question is asking for. This is where it's important you balanced the equation correctly because you're going to compare the mol ratios. To do this, you have to look at the coefficients in front of Al, which is a 2. so you write 2 mol Al on the second bottom section. and then on top you look at the balanced equation again and look at the coefficient in front of Al2O3, which there is none so it's a 1. Then all you have to do is convert back to grams because the question wants it in grams. so you put 1 mol on the bottom and then you look at your periodic table to figure out the mass of Al2O3. Al= 27, O= 16. (27x 2) + (16 x 3) = 102. Finally you just multiply all the numbers on the top row and then multiple all the numbers on the bottom row and then divide what you get on the top by the bottom.
What can be inferred from the graph?
do the yoga boi TUT yooooooooooooooooooooo9ooooooooot
The following equation illustrates the chemical reaction that occurs in a plant.
Water + carbon dioxide + light energy → sugar + oxygen.
Based on the law of conservation of energy, what happened to the light energy in the reaction?
A) It was produced by the plant.
B) It was destroyed
C) It was changed into oxygen gas
D) It was converted into chemical energy stored in the sugar.
it was produced by a plant
Does an increase in temperature always indicate that a chemical change has occurred?
I need a yes or no answer with a simple explanation, please...
20 points to whoever can answer these 3 questions correctly
Pt. 3
Answer:
Explanation:
You can't award 20 points once you have awarded 5.
One
2K + Cl2 ==> 2KCl
It's True
There are 2 Ks and Cl2 has 2 atoms making up on the left.
On the right, 1 molecule of KCl has 1 Potassium and 1 Cl. But there are 2 molecules so between the two of them, there's 2 Potassiums and 2 Cl
Two
The reactant side is the Left side. Cl2 means there are 2 Cl atoms making Cl2. Answer B
Three
False: There are 2 but read below.
I really don't know how to answer that. It's not qualified enough. There are a total of 2 Chlorines on the right hand side when there are 2 molecules. I think you are intended to answer False, but don't be surprised if you get it wrong.
How many moles are present in 2.6 g of CO2?
Answer:
0.059 moles are present in 2.6 g of CO₂
Explanation:
Molar mass is the mass of one mole of a substance, which can be an element or a compound. That is, it is the amount of mass that a substance contains in one mole.
In this case, the mass of each element being:
C: 12 g/moleO: 16 g/molethen the molar mass of the compound is:
CO₂= 12 g/mole + 2*16 g/mole= 44 g/mole
Then you can apply the following rule of three: if by definition of molar mass 44 grams of CO₂ are present in 1 mole, 2.6 grams will be present in how many moles?
[tex]amount of moles=\frac{2.6 grams*1 mole}{44 grams}[/tex]
amount of moles= 0.059 moles
0.059 moles are present in 2.6 g of CO₂
How does Cancer Begin?
Answer:
Cancer is a disease caused when cells divide uncontrollably and spread into surrounding tissues.
Explanation: Cancer is caused by changes to DNA. Most cancer-causing DNA changes occur in sections of DNA called genes. These changes are also called genetic changes.
-Hope this helped
I WILL MARK THE BRAINLYEST AND GIVE YOU 100 POINTS
PLEASE HELP ME!!!!!!!!! I DONT UNDERSTAND THIS! :(
CONVERT 65 GRAMS OF OXYGEN TO MOLES.
IM CONFUSED !
IF YOU ANSWER THIS I NEED THE STEP OF HOW YOU FOUND IT TOO!!! AND WHY THAT IS THE ANSWER TOO!!!!!
Answer:
4.0625
Explanation:
1 grams Oxygen to mol = 0.0625 mol
0.0625 x 65 =4.0625
Answer:
what the other guy said
Explanation:
What will happen when iodine solution is added to a solution of potassium bromide?
A)No reaction
B)Solid iodine is produced
C)Bromine is produced
Answer:
C) Bromine is produced
Explanation:
When iodine chemically reacts with potassium bromide then it will lead to the formation of potassium iodide and bromine. This reaction is actually a single displacement reaction in which bromine from potassium bromide is displaced by iodine atom.
When iodine solution is added to potassium bromide solution ,bromine is produced. It is an example of displacement reaction.
What are displacement reactions ?
Displacement reactions are chemical reactions in which one element present in a compound is replaced by another element.The reaction generally takes place between a molecule and a compound.
During the reaction, the anion of compound is replaced by the molecule and the anion of the compound is transformed into a molecule.When iodine molecule in form of solution is reacted with solution of potassium bromide solution of potassium iodide is obtained.
During this reaction anion of potassium bromide that is bromine is replaced by iodine forming solution of potassium iodide and molecule of bromine is liberated in the form of gas.
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I need help pls...Thanks
Answer:
4. 125°C
Explanation:
I hope this helps you :D
Answer:
Explanation:can you take a pic of it a little up so i can see the h please??
Mention the reason why aquatic plants have air filled tissues.
Answer:
Aquatic plants have aur filled tissues to make them easy to float.....
Explanation:
It provides buoyancy
Which electromagnetic wave has the longest
wavelength? Describe the energy level and
frequency of this wave.
Answer:
radio waves
Explanation:
which has the longest wavelength and lowest frequency and energy. Ultraviolet light (UV) is divided into three regions: UV A, wavelength = 400 - 320 nm UV B, wavelength = 320 - 280 nm
i/3 of 12 = 2/3 of
please help at 11 o'clock am it needs to be done
Answer:
6
Explanation:
This question is seeking for an equivalent of one expression. The first expression says 1/3 of 12, which means 1/3 × 12 = 4. To find 2/3 of a number that will give us 4, we say
Since; 1/3 of 12 is 4
Then, 4 = 2/3 of x, where x is the number, which when multiplied by two-third (2/3) will result to 4.
4 = 2/3 × x
4 = 2x/3
Cross multiply
2x = 3 × 4
2x = 12
x = 12/2
x = 6.
This means that; 1/3 of 12 = 2/3 of 6
Select the correct answer.
What is the chemical name of the covalent compound SF6?
A.
monosulfur hexafluoride
B.
monosulfide hexafluorine
C.
sulfur hexafluoride
D.
hexasulfur fluoride
Answer:
sulfur hexafluoride....
Answer:
c. Sulfur hexafluorideExplanation:
Sulfur hexafluoride (SF6) or sulphur hexafluoride (British spelling), is an extremely potent and persistent greenhouse gas that is primarily utilized as an electrical insulator and arc suppressant. It is inorganic, colorless, odorless, non-flammable, and non-toxic. SF.
MARK ME BRAINLISTPLZ FOLLOW MEwhat is the percent of just the oreo(out of 100%) from the total mass of these 3 cookies combined
Answer:
Percent mass of oreo = 35.11%
Explanation:
Given:
Mass of oreo = 17.1
Mass of 1st cookie = 16.2
Mass of 3rd cookie = 15.4
Find:
Percent mass of oreo
Computation:
Total mass = Mass of oreo + Mass of 1st cookie + Mass of 3rd cookie
Total mass = 17.1 + 16.2 + 15.4
Total mass = 48.7
Percent mass of oreo = [Mass of oreo/Total mass]100
Percent mass of oreo = [17.1 / 48.7]100
Percent mass of oreo = 35.11%
what is law of conservation of mass
Answer:
Mass in an isolated system can neither be destroyed nor created.
Explanation:
In a chemical reaction, mass can neither be created nor be destroyed.
Which coefficient placed before HCl will balance the following
equation? Zn+HCI ZnCl2 + H2
Explanation:
Given chemical equation
Zn + HCL ➡ ZnCl2 + H2
Now balancing
Zn + 2HCL ➡ ZnCl2 + H2
Hope it will help :)❤
The coefficient placed before HCl which makes the equation to be balanced is 2.
To know which coefficient will be placed before HCl to balance the equation, we shall simply balance the equation given from the question.
Zn + HCl —> ZnCl₂ + H₂
The above equation can be balance as illustrated below:
There are 2 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 2 before HCl as shown below:
Zn + 2HCl —> ZnCl₂ + H₂
Now, the equation is balanced.
From the balanced equation above, the coefficient written before HCl which makes the equation to be balance is 2.
Learn more: https://brainly.com/question/13025541
What happens to the air temperature if you add extra CO2?
Answer:
Adding more CO2 to the atmosphere will cause surface temperatures to continue to increase. However, more energy is absorbed in the weaker bands and in the wings of the strong band, causing the surface and lower atmosphere to warm further.
2 Write a word equation and
a symbol equation for the
reaction of solid zinc oxide
(ZnO) with sulfuric acid.
Answer:
Zinc oxide is react with sulphuric acid to give zinc sulphate and water.
zinc oxide +sulphuric acid ⇒ zinc sulphate + water
Zno +H2So4 ⇒ZnSo4 + H2O
SULPHURIC ACID = H2SO4
ZINC SULPHATE =ZnO
Explanation:
Powdered sodium carbonate reacts with a solution of sulphuric acid (H2SO4) to make a solution of sodium sulphate and water
carbon dixide is given
off.
Answer:
yes
Explanation:
Na2CO3 + H2SO4 --> Na2SO4 + H2O + CO2
NEED ASAP!! WILL GIVE BRAINLIEST!! Only have 10 minutes left please help.
3. (50 points) What is the mass of 80.0L of Oxygen gas (02) at 2 atm and 50 ° C in temperature? Mass should be in units of grams.
Show work!
Answer:
i just feel rlly bad that you need it now, i cant help but all i can say is you got this mate
A behavioral adaptation when an animal becomes inactive in the winter is _____.
A. hibernation
B. camouflage
C. migration
D.sleeping
Answer:
A. hibernation
Answer:
Hibernation.
Explanation:
What types of chemical
reactions can change a toxic
chemical into one that is less
toxic
Answer:
Very toxic materials are substances that may cause significant harm or even death to an individual if even very small amounts enter the body.There are a number of very toxic materials that may be used in workplaces. Some examples include carbon monoxide, hydrogen sulfide, chlorine and sodium cyanide
Explanation:
here are generally four types of toxic entities; chemical, biological, physical and radiation: Chemical toxicants include inorganic substances such as, lead, mercury, hydrofluoric acid, and chlorine gas, and organic compounds such as methyl alcohol, most medications, and toxins.
The highly toxic chemical compounds can be changed to less toxic one by suitable substitution reactions where, a functional group which less hazardous but having the same biochemical properties are substituted for the new product.
What is toxicity?Toxicity of a chemical is its ability to cause serious health risks which can strike a single cell. Exposure to toxic chemicals may even lead to death. The dose of toxicity depends on the structure and reactivity of the chemicals.
Also the adverse effect of each toxic chemicals depends on the way of exposure, and the amount of exposed chemical. There are some methods to detoxify a living body if any toxic is intaken. Suitable antidotes are given for them.
The toxicity generated in a chemical might be originated from a certain structure or group. Thus, by altering that group for instance substituting a ring or removing them ir substituting a functional group that is responsible for the toxicity will make the chemical less toxic.
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Of the following choices, which is the best way to help Earth's water supply
last for future generations?
A. Build thermal power plants.
B. Reduce residential water use.
C. Promote private swimming pool construction.
D. Avoid drip irrigation systems on farms.
The best way for helping the earth water supply that should be last for future generations should be considered option b. where it decrease the residential water usage.
What is residential water?The average American family should be used for more than 300 gallons of the water per day at home. Approximately 70% of the use should arise indoors,
Moreover, outdoor water should be accounted for 30% of household that should be high in drier parts for the country and it should be more water intensive landscape.
Therefore, the option b is correct.
Learn more about water here: https://brainly.com/question/20229458
2) Where is Earth, exactly? Use this image to find our location. Earth is
Located in the
A) Norma arm
B) Outer arm
C) Orion spur.
D) Galactic bar
Answer:
C) Orion spur.
The Orion Arm is a minor spiral arm of the Milky Way Galaxy that is 3,500 light-years across and approximately 10,000 light-years in length, containing the Solar System, including Earth.
How many grams are in 1.11 molecules of N2?
Answer:
15.547437000000029
Explanation:
Name a non-metal used to make electrode in the cell.
Answer:
graphite
Explanation:
graphite is also good conductor of electricity
4 Al + 3 O2 -> 2 Al2O3 How much aluminum would be needed to completely react with 45 grams of Oz?
Answer:
50.6g Al would be needed
Explanation:
Based on the reaction:
4Al + 3O₂ → 2Al₂O₃
4 moles of aluminium react with 3 moles of oxygen to produce 2 moles of Al₂O₃
To solve this question we need to find the moles of 45g of O₂. Then using the chemical equation find the moles of Al and its mass:
Moles O₂ -Molar mass: 32g/mol-:
45g O₂ * (1mol / 32g) = 1.41 moles O₂
Moles Al:
1.41 moles O₂ * (4mol Al / 3mol O₂) = 1.875 moles Al
Mass Al -Molar mass: 26.98g/mol-:
1.875 moles Al * (26.98g / mol) =
50.6g Al would be needed
The amount of aluminum that would be required to completely react with 45 grams of O2 would be 50.59 grams.
From the balanced equation of the reaction:
[tex]4 Al + 3 O_2 ---> 2 Al_2O_3[/tex]
The mole ratio of Al to O2 is 4:3.
Mole of 45 grams of O2 = mass/molar mass
= 45/32
= 1.4063 moles
Equivalent mole of Al: 4 x 1.4063/3
= 1.875 moles
mass of Al = mole x molar mass
= 1.875 x 26.98
= 50.59 grams
More on stoichiometry calculations can be found here: https://brainly.com/question/22288091?referrer=searchResults
What type of nonvisible light has a longer wavelength than the color red?
Answer:
i believe its blue
Explanation:
Vitamin C has an empirical formula of C3H4O3 and a molecular mass of 176 amu. What is the molecular formula of vitamin C?
Answer:
(C3H4O3) x 2 = C6H8O6, the molecular formula for Vitamin C.
