Answer: characteristic molar mass of an element is simply the atomic mass in g/mol. However, molar mass can also be calculated by multiplying the atomic mass in amu by the molar mass constant (1 g/mol).
Explanation:
o calculate the molar mass of a compound with multiple atoms, sum all the atomic mass of the constituent atoms. so the answer to your question is B
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Answer: Molecular formula of copper (II) bromide is [tex]CuBr_2[/tex]
Molecular formula of aluminium (III) nitrate is [tex]Al(NO_3)_3[/tex]
Molecular formula of calcium (II) phosphate is [tex]Ca_3(PO_4)_2[/tex]
Molecular formula of iron (III) sulphide is [tex]Fe_2S_3[/tex]
Molecular formula of mercury (II) chloride is [tex]HgCl_2[/tex]
Molecular formula of magnesium (II) acetate is [tex](CH_3COO)_2Mg[/tex]
Explanation:
The name of the ionic compounds is written by writing the name of the cation first followed by its oxidation state in round brackets and then the name of the anion is written without any suffix. Thus the cation is written first followed by the oxidation state and then the anion.
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral compound.
Molecular formula of copper (II) bromide is [tex]CuBr_2[/tex]
Molecular formula of aluminium (III) nitrate is [tex]Al(NO_3)_3[/tex]
Molecular formula of calcium (II) phosphate is [tex]Ca_3(PO_4)_2[/tex]
Molecular formula of iron (III) sulphide is [tex]Fe_2S_3[/tex]
Molecular formula of mercury (II) chloride is [tex]HgCl_2[/tex]
Molecular formula of magnesium (II) acetate is [tex](CH_3COO)_2Mg[/tex]
a hypothesis is tested by ___.
a. proposing a theory
b. conducting an experiment
c. making further observations
d. talking with other scientists
Answer:
A.
Explanation:
because a theory is like a prediction and a prediction is like a hypothesis.
How do you name ethers in chemistry?
Answer:
Common names of ethers simply give the names of the two alkyl groups bonded to oxygen and add the word ether. The current practice is to list the alkyl groups in alphabetical order (t-butyl methyl ether), but older names often list the alkyl groups in increasing order of size (methyl t-butyl ether).
Explanation:
Hope it is helpful.......
HELP!!!! Which of the following substances is a major component in acid rain?
A) KOH
B) NH3
C) SO2
D) NaOH
Answer:
(C) SO2.
SO2 is known as sulfur dioxide.
The below information about acid rain and SO2’s involvement is from epa.gov:
“Acid rain results when sulfur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents. The SO2 and NOX react with water, oxygen and other chemicals to form sulfuric and nitric acids. These then mix with water and other materials before falling to the ground.”
Explanation:
Give the product expected when the following alcohol reacts with pyridinium chlorochromate (PCC). (Assume that PCC is present in excess.) The starting material is a 4 carbon ring where carbon 1 is bonded to O H and C H 3. Carbon 3 is bonded to C H 2 C H 2 O H. This reacts with P C C in C H 2 C L 2 to give the product. Draw the product.
Answer:
Kindly check the explanation section.
Explanation:
Based on the description of the reacting -OH group containing Compound, the drawing of the chemical compound is given in the attached picture.
So, without mincing words let's dive straight into the solution to the question.
The reaction between the OH containing compound and PCC is an oxidation reaction.
Looking at the carbon number 1 which the first OH group and CH3 are attached to. Oxidation can not occur here as tertiary alcohol can not be oxidize.
Hence, the second OH will be oxidized into a carbonyl group, C = O. Kindly note that when alcohol oxidizes it turns into an aldehyde.
The equation for the reaction is also given the the attached picture.
What caused the disappearance of land bridges? O A. Recession of glaciers and ice caps O B. Mountain building O C. Formation of the polar ice caps O D. A meteorite impact
Answer:
A. Recession of glaciers and ice caps
Explanation:
Land bridges began to disappear after the Ice Age ended.
Basically, a rise in sea level.
Hope this helps :D
Answer:
Recession of glaciers and ice cap
Explanation:
because i just took the test
100% sure
explain how liquid can enter the gas phase without reaching its boiling point
How did Dmitri Mendeleev arrange the periodic law?
a. Each set of elements was arranged in special columns based on their mass.
b. Each set of elements was arranged in special columns based on their diameter.
c. Each set of elements was arranged in special periods based on their qualities.
d. Each set of elements was arranged in alphabetical order.
Answer:
a. Each set of elements was arranged in special coloumns based on their mass.
Which of the following compounds are held together by ionic bonds? Select all that apply.
O A. CaCl2
OB. CH4
OC. Naci
D. sodium bromide
E. carbon dioxide
F. FeBr3
Answer:
Explanation:
All of above except carbon dioxide
The compound that is held together by ionic bonds are CaCl₂, NaCl, sodium bromide, and FeBr₃. The correct options are A, C, D, and F.
What are ionic bonds?Ionic bonds are electrovalent bonds. These bonds are formed when two or more atoms lose electrons or gain electrons to form an ion. Ions are opposite charges that attract each other. Ionic bonds are formed in both metals and non-metals.
CaCl₂, calcium chloride, is formed between metals and non-metals. Some more examples are NaOH – Sodium Hydroxide, NaHCO₃—Sodium Hydrogen Carbonate, etc.
An example is NaCl, is sodium has 11 atomic numbers. Chloride has 6 electrons in its outermost shell. They will share electrons with each other to make the noble gas configuration.
Thus, the correct options are A. CaCl₂, C. NaCl, D, sodium bromide, and F. FeBr₃.
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The Rock Cycle moves in a specific order. True or
False
Answer:
it is false
Explanation:
it goes in different ways not in order
There is a 2 percent defect rate at a specific point in a production process. If an inspector is placed at this point, all the defects can be detected and eliminated. The inspector would cost $10 per hour and could inspect units in the process at the current production rate of 48 per hour.
If no inspector is hired and defects are allowed to pass this point, there is a cost of $11 per defective unit to correct the defects later on.
Assume that the line will operate at the same rate (i.e., the current production rate) regardless of whether the inspector is hired or not.
a. If an inspector is hired, what will be the inspection cost per unit? (Round your answer to 3 decimal places.)
Inspection cost per unit _____________$
b. If an inspector is not hired, what will be the defective cost per unit? (Round your answer to 3 decimal places.)
Defective cost per unit _____________$
c. Should an inspector be hired based on costs alone?
Answer:
A) $0.208 per unit
B) $0.220 per unit
C) An inspector should be hired
Explanation:
percentage of defect rate = 2% = 0.02
cost of inspector = $10 per hour
production rate = 48 per hour
cost of not hiring an inspector = $11
A) Determine the inspection cost per unit if an inspector is hired
= cost of inspector / production rate
= 10 / 48 = $0.208 per unit
B) Determine the defective cost per unit if an Inspector is not hired
= cost of not hiring an inspector * percentage of defect rate
= 11 * 0.02
= $0.220 per unit
C) Inspection cost < defective cost i.e. $0.208 < $0.220 hence an inspector should be hired
What causes lightning?
A. Build up of electric charges in the clouds
B. Flow of electric charges among clouds
C. Light energy created in the clouds
D. Reflection of light by the clouds
Answer:
B.
Explanation:
Not sure if this is correct if not sorry.
I would like to get some examples of Newtons 1st,2nd, and 3rd Law
Answer:
Explanation:
Newtons 1st law:
If you slide a hockey puck on ice, eventually it will stop, because of friction on the ice. It might also stop if a hockey player places their stick in front of it.
Newton's 2nd law:
If the mass of an object is 20 kg and it's acceleration is 5 m/s, the force acting upon it is (m*a or 20*5) 100 N.
Another example that proves that force is dependent upon mass is that if you were to move a car and a truck (that were both previously stationary) at the same speed, the car would take less force/effort to move than the truck.
Newton's 3rd law:
If a book on a table, the table is exerting a force on it that is equal and opposite to the force of gravity.
If two soccer balls of the same mass collide, one moving and one stationary, then they would both apply an equal and opposite force onto each other, causing the moving ball to stop and the previously stationary ball to move at the speed of the previously moving ball.
In an experiment, a 88.11 mL sample of unknown silver nitrate solution was treated with 9.753 g of sodium chloride, resulting in 4.576 g of precipitate. Calculate the molarity of the silver nitrate solution
Answer:
[tex]M=0.362M[/tex]
Explanation:
Hello!
In this case, according to the following chemical reaction:
[tex]AgNO_3(aq)+NaCl(aq)\rightarrow AgCl(s)+NaNO_3(aq)[/tex]
It is possible to compute the moles of silver nitrate via stoichiometry that produced 4.576 g of silver chloride as shown below:
[tex]n_{AgNO_3}=4.576gAgCl*\frac{1molAgCl}{143.32gAgCl}*\frac{1molAgNO_3}{1molAgCl}\\\\n_{AgNO_3}=0.03193molAgNO_3[/tex]
Thus, since the molarity is obtained by dividing moles by volume, we obtain:
[tex]M=\frac{0.03193mol}{0.08811L}\\\\M=0.362M[/tex]
Best regards!
ANSWER ASAP!
The sun provides what almost everything on Earth needs to go—energy, or heat. Heat causes liquid and frozen water to evaporate into water vapor gas, which rises high in the sky to form clouds... clouds that move over the globe and drop rain and snow. This process is a large part of the water cycle.
Answer:
whats the question so i can answer?
7. Consider an element with 2
electrons on the 1st shell and 4
electrons on the 2nd shell. What
element is likely to have that Bohr
model?
Answer:
Carbon (C)
Explanation:
The electron configuration of Carbon is 2-4.
3. What is the molar mass of O2? Round to nearest whole number.
8
O
16
32
64
Answer:
Molar mass of O is = 16
Molar mass of O2 = 32
If the volume of a solution is 25.6 L and its molarity is 8.20 M, how many moles of solute are
dissolved?
210 mol
O the molar mass of the solute is required to calculate the moles
O 3.12 mol
O 0.320 mol
Answer:
210 moles
Explanation:
From the question given above, the following data were obtained:
Volume of solution = 25.6 L
Molarity = 8.20 M
Mole of solute =?
Molarity is simply defined as the mole of solute per unit litre of water. Mathematically, it can be expressed as:
Molarity = mole /Volume
With the above formula, the mole of solute dissolved can be obtained as follow:
Volume of solution = 25.6 L
Molarity = 8.20 M
Mole of solute =?
Molarity = mole /Volume
8.20 = mole / 25.6
Cross multiply
Mole = 8.20 × 25.6
Mole = 209.92 ≈ 210 moles
Thus, the mole of solute dissolved in the solution is 210 moles
100 g of milk has the following composition:
4.7 g of carbohydrates, 5 g of minerals, 3.8 g of proteins, and 3.3 g of lipids.
1. Calculate the energy value in Kcal of 100 g of milk.
2. Deduce this energy in Kj.
3. Calculate the energy value in 225 g of milk.
Given:
lg of carbohydrate provides 3.75 Kcal.
ig of lipid provides 9 Kcal.
lg of protein provide 4 Kcal.
Answer:
Explanation:
SADOPOAKAWAASDASWDWSDWAA
What is the equilibrium constant for the reaction
SO2(g) + NO2(9) = SO3(g) + NO(g)?
А. Keq: [S03)(S02]
[NO][NO2]
B. Keq: [SO2)(NO2]
[SO3)(NO]
C. Keq: [SO3)3(NO]
[SO2)2(NO2)2
D. Keq: [SO3)(NO]
[SO2]NO2]
Answer:
D. Keq: [SO3][NO] /[SO2]NO2]
Explanation:
Hello!
In this case, according to the process to set up equilibrium expressions for chemical reactions at equilibrium, we realize we need to write up the concentration of products on top and that of reactants on bottom; thus, for there chemical reaction herein specified, we obtain:
[tex]Keq=\frac{[SO_3][NO]}{[SO_2][NO_2]}[/tex]
Thereby, the answer is D. Keq: [SO3][NO] /[SO2]NO2].
Best regards!
Answer:
D
Explanation:
how many atoms are in 1.7 mols of CHF3
Given :
Number of moles of CHF₃ is 1.7 .
Solution :
We know, 1 mole of any complex contains 6.022 × 10²³ molecules.
Let, 1.7 moles of CHF₃ contains n numbers of molecules.
So, n = 1.7 × 6.022 × 10²³ molecules
n = 10.2374 × 10²³ molecules
n = 1.0237 × 10²³ molecules
Hence, this is the required solution.
What is the normal pH range of a Base?
Answer:
7.35 - 7.45
Explanation:
The pH scale ranges from 0 (strongly acidic) to 14 (strongly basic or alkaline). A pH of 7.0, in the middle of this scale, is neutral. Blood is normally slightly basic, with a normal pH range of about 7.35 to 7.45. Usually, the body maintains the pH of blood close to 7.40.
Hope this helps
Answer:
The normal pH range if a base is more than 7
Explanation:
Basideally the pH range goes from 0-14 in which
Acidic range is :0-7
Neutral :7
Base : 7 - 14
What is the number of nitrogen molecules that reacted with excess hydrogen to make 2x10^10 molecules of ammonia
According to stoichiometry and mole concept,1×10¹⁰ molecules reacted with excess hydrogen to make 2 x 10¹⁰ molecules of ammonia.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is important while balancing chemical equations.
In the given example, as 1 molecule of nitrogen produces 2 molecules of ammonia
∴2 x 10¹⁰ molecules of ammonia will be produced when 2 x 10¹⁰×1/2=1×10¹⁰ molecules .
Thus, 1×10¹⁰ molecules reacted with excess hydrogen to make 2 x 10¹⁰ molecules of ammonia.
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The change from a liquid to a solid is called
Answer:
A cat jk but for real (It's called Freezing and I feel like explaining it)
Explanation:
Freezing is a process where a liquid changes to a solid by cooling.
If water (liquid state) is cooled, it changes to ice (solid-state). This change is called FREEZING. The temperature at which this occurs is called the freezing point (fp) of the substance.
Answer:
Freezing phase transition
Explanation:
Freezing is a phase transition in which a liquid turns into a solid when its temperature is lowered to its freezing point.Freezing, or solidification, is a phase transition in which a liquid turns into a solid when its temperature is lowered to or below its freezing point. All known liquids, except helium, freeze when the temperature is low enough.
(hope this helps can i plz have brainlist :D hehe)
Is CaO binary or polyatomic?
Answer:
It is going to be binary
Explanation:
there is no such thing as a universal solvent- explain? I’ll mark brainiest!!!
Answer:
A true universal solvent does not exist. Although water is considered to be a the "universal solvent" it only dissolves other polar molecules. It does not dissolve nonpolar molecules, including organic compounds such as fats and oils. It is only called so because it can dissolve many more than other liquids.
A sample of metal has a mass of 16.12 g, and a volume of 4.87 mL. What is the density of this metal?
Answer:
3.31 g/cm³
Explanation:
1000cm³ = 1L
4.87mL = 4.87 × 10^-3 × 1000 = 4.87 cm³
density = mass/volume = 16.12/4.87 = 3.31 g/cm³
How to frick a chicken...
Answer:uhhhhh should I be concerned
Explanation:
Answer:
hmmm o_O Maybe you... shouldnt
Please help, and if you could also give me a step by step that would be awesome!!
Answer:
4.4 g
Explanation:
Step 1: Write the balanced equation
Cu + 4 HNO₃ ⇒ Cu(NO₃)₂ + 2 NO₂ + 2 H₂O
Step 2: Calculate the moles corresponding to 3.2 L of NO₂ at STP
At standard temperature and pressure, 1 mole of NO₂ occupies 22.4 L.
3.2 L × 1 mol/22.4 L = 0.14 mol
Step 3: Calculate the moles of Cu needed to produce 0.14 moles of NO₂
The molar ratio of Cu to NO₂ is 1:2. The moles of Cu needed are 1/2 × 0.14 mol = 0.070 mol.
Step 4: Calculate the mass corresponding to 0.070 moles of Cu
The molar mass of Cu is 63.55 g/mol.
0.070 mol × 63.55 g/mol = 4.4 g
5) Calculate the molality of 0.210 mol of KBr dissolved in 0.075kg pure
water?
Answer:
2.8 m
Explanation:
From the question given above, the following data were obtained:
Number of mole KBr = 0.210 mole
Mass of water = 0.075 kg
Molality of KBr =?
Molality is simply defined as the mole of solute per unit kg of water. Mathematically, it can be expressed as follow:
Molality = mole of solute / Kg of water.
With the above formula, we can obtain the molality of the KBr solution. This can be obtained as follow:
Number of mole KBr = 0.210 mole
Mass of water = 0.075 kg
Molality of KBr =?
Molality = mole of solute / Kg of water.
Molality = 0.210 / 0.075
Molality = 2.8 m
Therefore, the molality of the KBr solution is 2.8 m.