Answer:
2 M
Explanation:
mole weight of CaBr2 = 40 + 2 * 79.9 = 199.8 gm
20 gm is then 20/199.8 =.1 mole
.1 mole / .50 liter = 2 M
Which type of solid is usually the hardest?
• Ionic
• Molecular
• Network
• Metallic
Answer:
metallic is the correct one
Explanation:
Any metal such as iron are usually hard
Metallic type of solid is usually the hardest. Option D is correct.
What is metal?A metal is a solid which is hard in nature shiny and smooth and produce sound when collide with each use to make ornaments, utensils or big machines etc. as there are different metals and hard too.
Some examples are gold, silver, copper, platinum, steel etc. they all are good conductor of electricity mostly copper is used to make wires and steel for making buildings etc. because of strong molecular force they are hard.
Therefore, Metallic type of solid is usually the hardest. Option D is correct.
Learn more about metals, here:
https://brainly.com/question/20602843
#SPJ2
If you made 10.8 moles of AlCl₃, how many moles of Aluminum would you need?
Answer: 10.8 mol
Explanation:
The balanced equation in the image represents the reaction where aluminum chloride is formed from its elements.
From this equation, we know that for every 2 moles of aluminum consumed, 2 moles of aluminum chloride are produced (we can reduce this to conclude that moles of aluminum consumed = moles of aluminum chloride produced)
This means the answer is 10.8 mol.
Bond polarity of Si and H
Answer:
Si 1.90
H 2.20
Explanation:good luck
Part A Only trace amounts of the synthetic element darmstadtium, atomic number 110, have been obtained. The element is so highly unstable that no observations of its properties have been possible. Based on its position in the periodic table, propose three different reasonable valence electron configurations for this element
Darmstadtium based on its position in the periodic table, proposes three different reasonable valence electron configurations for this element is 2.
What is darmstadtium?Darmstadtium was first synthesized by research scientists at the Heavy Ion Research Laboratory in Darmstadt, Germany in 1994. The element was made by bombarding lead-208 atoms with nickel-62 atoms in a heavy-ion accelerator. Four atoms of darmstadtium were produced in the first experiment.
Darmstadtium is a chemical element with the symbol Ds and atomic number 110.
It is an extremely radioactive synthetic element.
Darmstadtium based on its position in the periodic table, proposes three different reasonable valence electron configurations for this element is 2.
Learn more about darmstadtium here:
https://brainly.com/question/18473658
#SPJ1
Can someone help me with this
What is this chemistry form
Answer:
Think it's C16H31FN2O2, but I couldn't find anything else about it.
Explanation:
It's an organic chemistry skeletal structure and it's very difficult to explain how to read. Hopefully this gave you a push in the right direction, I know it wasn't the most complete answer.
how many quartz does 456 ml contain
Answer:
431536.9mL
Explanation:
if the temperature in the gas cylinder shown increases to 30.0°C and the pressure increases to 1.20, will the cylinder's piston move up or down
Answer:
Up
Explanation:
Which statement correctly defines digestion
1.digestion is mixing food with Silva, which is when Mechanical digestion starts.
2.digestion is chewing food, which is a means of chemical digestion.
3.digestion is a reversible process due to mechanical digestion.
4.digestion is the process of breaking down food into smaller molecules
Answer: 4
Explanation: digestion is the process of breaking down food by mechanical and enzymatic action in the alimentary canal into substances that can be used by the body.
Answer:
4.digestion is the process of breaking down food into smaller molecules
Explanation:
How would one convert 15 seconds to hours?
Answer:
A
Explanation:
15 sec * 1 hr/3600 sec (note how 'sec' cancels out and you are left with 'hour' in your answer) = 15/3600 hour
Answer:
answer d
Explanation:
PLEASE HURRY!!!!!!
1. Good health is dependent upon…
Proper food
Exercise
Rest
All of the above
2. Which of the following has the highest tetanus potential?
A cut by barbed wire at a dairy farm
The puncture of a kitchen knife
An infesting by ticks
The bite of a wild animal
3. (Select all that apply) The three general requirements for resisting disease are:
Exercising
Eating food high in calories
Getting plenty of rest
Eating food that will give you proper nutrition
Taking lots of vitamins
4. Which areas have the fastest population growth?
Agriculture
Suburban
Rural
Cities
5. Every nation has something to develop for the world’s benefit.
True
False
6. Hypothermia can be prevented by proper planning.
True
False
7. Not all land on Earth is currently habitable; ________________.
Therefore, there is not enough land left to inhabit.
Therefore, there is not enough land left to support the growing population
Therefore; there is not enough land left to farm
But, there still remains a vast amount of land to e inhabited all over the Earth
8. Tetanus is sometimes referred to as “lockjaw”.
True
False
9. (Select all that apply) The whooping cough and measles can be prevented by:
Washing hands
Mosquito netting
Sharing eating utensils
Checking for ticks
Vaccination
10. Rabies, typhus and malaria are…
Transmitted by animal bites
Disease which have been eradicated
All untreatable
Caused by viruses
11. Which of the following diseases is caused by a virus?
Malaria
Athlete's foot
Smallpox
Cholera
12. The two internal mechanisms that fight disease include white blood cells and _______.
Antibodies
Vaccines
THANK YOU FOR THE ANSWERS AND PLEASE HURRY! AMEN AND BLESS YOUR SOUL AND HEART!!!!
Answer:
1) d. all of the above
2) a. cut from a barbed wire at a dairy farm
3) check 3, 4, 5
4) b. suburban areas
5) true
6) is true
7) d. "but..."
8) true
9) check 1, 2, 5
10) a. animal bites
11) c. smallpox
12. antibodies
How many grams are in 3.45 moles CO2
To Find:-
Grams Present in 3.45 Moles of Carbon.
We Know:-
Molecular Mass of Carbon Dioxide= 44.01 grams/mol or 44 grams/mol
[tex] \text{Moles} = \frac{\text{Mass}}{\text{Molecular mass}}[/tex]
[tex] \implies 3.45 \text{moles} = \frac{ \text{Mass}}{44 \text{g/mol}} \\ \\ \implies \text{Mass} = {44 \text{g/mol}} \times 3.45 \text{moles} \\ \\ \implies \text{Mass} = {44 \text{g/} \cancel\text{ mol}} \times 3.45 \cancel\text{moles} \\ \\ \implies \text{Mass} = 44 \text{g} \times 3.45 \\ \\ \implies \text{Mass} = \red{151.8 \text{g}}[/tex]
[tex]\therefore \text{Mass of 3.45 Moles of Carbon Dioxide is = \red{151.8g}}[/tex]
Hope This Helps!!What does the word inquire with respect to the process scientific inquiry
Answer:
Science is all about learning and understanding something new. Inquiry means to ask for information or investigate something to find out more. So, scientific inquiry is using evidence from observations and investigations to create logical explanations and answer questions.
Please help me im begging
Which of these is a benefit of nuclear fusion?
A. It creates lower temperatures than nuclear fission reactions.
B. There is a lower risk of runaway chain reactions. C. Containment is easier for nuclear fusion.
D. It is less technically challenging than nuclear fission reactions.
Answer:
B. There is a lower risk of runaway chain reactions.
Answer:
b
explanation:
How many particles are in 0.645g of CaCl2
Answer:
~ 3.5 x 10^21
Explanation:
Mole weight of Ca Cl2 ( from periodic table ) = ~~ 111 gm
.645 gm / 111 gm / mole X 6.022 x 10^23 =
what is the correct answer for box c?
yields
products
subscript
coefficient
reactants
How many moles of MgBr2 are 75.24g of MgBr2
Answer:
0.409 mol
Explanation:
The formula to find he number of moles is:
No. of moles = [tex]\frac{mass}{Mr}[/tex]
Mr of MgBr₂ = 24.3 + (79.9 × 2) = 184.1
Mass = 75.25g
So, no. of moles = [tex]\frac{75.24}{184.1}[/tex]
No. of moles = 0.409 mol [to 3 significant figures]
I will mark brainliest
Answer:
a b c are correct and rest of other are incorrect
2Na + 2H20 - 2NaOH + H2
→
For the reaction shown here, predict the number of moles of both products, sodium hydroxide, and hydrogen gas, when ten moles of
sodium and ten moles of water fully react
A
B)
Ten moles of sodium hydroxide and ten moles of hydrogen gas will be
produced
Ten moles of sodium hydroxide and five moles of hydrogen gas will be
produced
Five moles of sodium hydroxide and ten moles of hydrogen gas will be
produced
moride and five moles of hydrogen gas will be
Answer: B) Ten moles of sodium hydroxide and five moles of hydrogen gas will be produced
Explanation: Got it right on USATestPrep
How much energy is required to 100.0 g of ice at -2oc to water at 84.0oc
Answer:
A copper cup with a mass of 100.0 g contains 96.0 g of water. Both. the cup and the water are at 13.0OC. If 70.0 g of a substance at 84.0OC is added to the cup, the temperature increases to 20.0OC. If the specific heat capacities of copper and water are exactly 390 and 4180 respectively, find the specific heat capacity of the substance.
Explanation:
hope this helps
Which is a possible heat capacity for a bomb calorimeter?
A) 11.20 kJ/°C
B) 14.21 kJ/(kg°C)
C) 15.32 kJ/mol
D) 15.75 kJ/g
1. write the formula for the following ionic compound: Calcium Carbonate
Answer:
CaCO3
Explanation:
The molecule is formed by the calcium cation Ca+2 and the carbonate anion CO3−2.
How many particles are in 2.5 mol of water, H2O?
Answer: 1.5×1024 molecules
Convert 34.0 mm to inches. Please use dimensional analysis, I know the answer is 1.34in I just don’t know how to get there.
[tex]34.0mm\ x\ \frac{cm}{10mm}\ x\ \frac{in}{2.54cm}[/tex]
put your equation so that your units cancel. The 'mm' will cancel with each other which will get you 'cm' and then the 'cm' will cancel with each other which will get you 'in'.
34.0 millimeters converted to inches would be 1.3385 inches.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
Any additional quantity of that type can be stated as a multiple of the measurement unit.
Length is one of the most commonly used measurement parameters.
As given in the problem statement we have to convert Convert 34.0 mm to inches by using the dimensional analysis,
As we know that millimeters and inches, both are units of length,
1 millimeter = 0.0393701 inches
34.0 millimeter = 34.0× 0.0393701 inches
= 1.3385 inches
34.0 millimeters converted to inches would be 1.3385 inches.
Thus, 34.0 millimeters converted to inches would be 1.3385 inches.
To learn more about the unit of measurement here, refer to the link;
brainly.com/question/12629581
#SPJ2
Does a precipitate form when you add 32.5 g of NaCl to 131.0 mL of 0.29 M Pb(NO3)2? (Ksp for possible ppt is 1.7 x 10-5)
Precipitate forms when you add 32.5 g of NaCl to 131.0 mL of 0.29 M [tex]Pb(NO_3)_2[/tex]
What is Ksp?
The solubility product constant, Ksp, is the equilibrium constant for a solid substance dissolving in an aqueous solution.
Writing the equation:
NaCl → [tex]Na^+[/tex] + [tex]Cl^-[/tex]
[tex]Pb(NO_3)_2[/tex] → [tex]Pb^2^+[/tex] + [tex]2NO^3^-[/tex]
[tex]Pb^2^+[/tex] + 2[tex]Cl^-[/tex] ↔ [tex]PbCl_2[/tex]
I.P = [ [tex]Pb^2^+[/tex]] * [ [tex]Cl^-[/tex] ]
Ksp [tex]PbCl_2[/tex] =[ [tex]Cl^-[/tex] ] * [[tex]Pb^2^+[/tex] ]
1.7 x [tex]10^-^5[/tex]= [ [tex]Cl^-[/tex] ] * [ [tex]Pb^2^+[/tex] ]
Molarity of NaCl = 4.24 M
Molarity of [tex]Pb(NO_3)_2[/tex] = 0.29 M
Ksp [tex]PbCl_2[/tex] =[ Cl- ] * [[tex]Pb^2^+[/tex] ]
Ksp << IP ⇒ precipitate formation will not take place.
Hence, the precipitate formation will not take place.
Learn more about Ksp here:
https://brainly.com/question/4736767
#SPJ1
What compound releases chlorine or bromine in the stratosphere, threatening the ozone layer?
Answer:
Halocarbons.
Explanation:
Atmospheric measurements have clearly corroborated theoretical studies showing that chlorine and bromine released from halocarbons in the stratosphere react with and destroy ozone.
URGENT PLEASEEEE, WILL GIVE 100 POINTS
Laughing gas, N2O can be turned into smog NO2 by heating the laughing gas in the presence of oxygen. _____N2O + _____O2 -->_____NO2
If 9.00 grams of laughing gas react. How many moles of oxygen react?
If 7.50 grams of oxygen react, how many grams of smog are produced?
Let's balance
2N_2O+3O_2---->4NO_2Moles of laughing gas
9/440.2mol2 moles need 3 mol O_2
1 mol needs= 1.5mol O_2
moles of O_2.
1.5(0.2)0.3mol#2
3 molO_2 produces 4 mol smog 1 mol produces 4/3=1.3mol smogMoles Of O_2
7.5/320.2molMoles of smog
1.3(0.2)=0.26molMass
0.26(46)11.96g2N₂O + 3O₂ ⇒ 4NO₂
mol N₂O = 9 g : 44 g/mol = 0.205
mol O₂ = 3/2 x 0.205 = 0.3075
mass O₂ = 0.3075 x 32 g/mol = 9.84 g
=================================
mol O₂ = 7.5 g : 32 g/mol = 0.234
mol NO₂ (smog) = 4/3 x 0.234 = 0.312
mass NO₂ = 0.312 x 46 g/mol = 14.352 g
2H2O2(aq) → 2H2(l) +O2(g) +196.4 kJ. What is the ∆H for a reaction in which 125 mL of 0.90 M H2O2 is completely decomposed?
Answer: When completely decomposed it will be -11 kJ
About how long does it take for the moon to cycle through all its different observable shapes? (2 points)
Group of answer choices
A day
A month
A year
An hour
Answer:
A month
Explanation:
1. Which creates a potential difference in an electric circuit
a voltage source
electric charges
a current source
a difference in height
Plese help me I need the answer right now
Answer:
voltage source
Explanation:
establishes an electric potential difference across the two ends of the external circuit and thus causes the charge to flow. The voltage source is the numerical value of this electric potential difference.
