Answer:
D) clapping handsExplanation:
hope it's helpful
Explain the difference between solid liquid and gaseous states using the theoritical
Answer:
solid is the substance which is hard
liquid is the substance which we get in liquid form for example water milk etc
gases are those substance which we cannot touch and see
Calculate the volume in Liters of 15 moles of Neon gas (at STP)
What is the mole fraction of ethanol when 23.2 g of ethanol(C2H5OH) are mixed with 73.1 g of water(H2O)?
(atomic mass of C= 12, H = 1, O = 16,)
Answer:
0.111
Explanation:
Step 1: Calculate the moles corresponding to 23.2 g of ethanol
The molar mass of C₂H₅OH is 46 g/mol.
23.2 g × 1 mol/46 g = 0.504 mol
Step 2: Calculate the moles corresponding to 73.1 g of water
The molar mass of H₂O is 18 g/mol.
73.1 g × 1 mol/18 g = 4.06 mol
Step 3: Calculate the total number of moles
n = nC₂H₅OH + nH₂O = 0.504 mol + 4.06 mol = 4.56 mol
Step 4: Calculate the mole fraction of ethanol
We will use the following expression.
Χ(C₂H₅OH) = nC₂H₅OH / n
Χ(C₂H₅OH) = 0.504 mol / 4.56 mol = 0.111
Press the yellow reset button at the bottom of the simulation screen. Under Constant Parameter, select Volume. Again,
pump the pump handle once to introduce 40 to 50 gas molecules. Record the pressure in the data table.
Use the heat control to heat the gas to each of the other temperatures in the data table, and record the new pressure.
В І о
x
X
Font Sizes
A -A-3 E 3
Temperature (K)
Pressure (atm)
300
600
900
1200
1500
Answer:
300 0.24
600 0.46
900 0.70
1200 0.95
1500 1.20
Explanation: correct on behavior gasses tutorial
Add 250.0mL to 5.00mL and round off the answer
Answer:
255mL
Explanation:
(250.0 + 5.00)mL = 255.00mL
255mL
If potassium is a soft reactive metal at room temperature, name one other element you would expect to also be a soft reactive metal at room temperature? How do you know?
Explanation:
Lithium
Sodium
group one elements are highly reactive
Which yield comes from measurements obtained during a real experiment?
A) actual yield
B) theoretical yield
C) percent yield
Answer:
A) actual yield
Explanation:
Actual yield is the amount of product that is actually produced in a chemical reaction.
Theoretical yield is the amount of product expected based on stoichiometry.
Per cent yield is the actual yield over the theoretical yield.
the food we eat can be classified into three groups called
A 11.0g sample of a compound containing only oxygen and carbon produce 3.0g carbon and 8.0g oxygen. Determined the empirical formula of the compound?
Answer:
Empirical formula: CO₂
Explanation:
The empirical formula is defined as the simplest ratio of atoms present in a molecule. We must convert the mass of carbon and oxygen to moles as follows:
Carbon -Molar mass: 12.01g/mol-
3.0g * (1mol / 12.01g) = 0.250 moles C
Oxygen -Molar mass: 16g/mol-
8.0g * (1mol / 16g) = 0.50 moles O
The ratio of O:C is:
0.50mol / 0.250mol = 2
That means the empirical formula is:
CO₂What must happen to the atoms before they are accelerated in the mass spectrometer?
Answer:
Atoms and molecules can be deflected by magnetic fields - provided the atom or molecule is first turned into an ion. Electrically charged particles are affected by a magnetic field although electrically neutral ones aren't. The atom or molecule is ionised by knocking one or more electrons off to give a positive ion.
Explanation:
Please Mark me brainliest
The atom must first be ionized.
The mass spectrometer is an important analytical tool in chemistry. It is used to identify atoms and molecules.
However, the atom or molecule to be analysed must first be converted into an ion.
This happens when the instrument imparts an electrical charge to the molecule or atom then the electrically charged ions are read as electrical current. The ion is accelerated towards a detector which analyses the deflected ions.
https://brainly.com/question/4780013
In which direction does the electric field point a position directly south of a positive charge?
Answer: Outward
Explanation: :The direction of electric field is radially outward for a positive charge and radially inward for a negative charge. Thus, for the electric field points toward south at a position directly south of a positive charge.
where is distillation used
Answer:
During separation of substances with different boiling points, fractional distillation is used.
During separation of substances in an eutectic mixture or azeotropic mixture, steam distillation is used.
63) How many moles of CaBr
2
are in 5.0 grams of CaBr
2
2.
4.0 x 101 mol
2.5 x 10-2 mol
4.2 x 10-2 mol
1.0 x 10'mol
Answer:
I think it will be the answer
2.5 x 10-2 mol
I hope it help you
2. Give a "water-wise" alternative to each
activity below.
(a) hosing off a driveway to
clean it
(b) watering outdoor plants with a hose
(c) letting the tap run to get cold water
i’m feeling good today you’ll get 30 points for the questions
Answer:
1. sweep it instead
2.use a wateringcan with a percise nossole to water your plants efectivly 3.keep a jug of water in your frisge
Explanation:
number of moles of sodium azide
Answer:
0.015382279644614 mole.
Answer:
yes this is the answer for that quaz
Which gas would effuse more slowly:
Xe
CO2
CH4
N2
N2 should be the gas to effuse more slowly
9. What is the total number of grams of NaOH (formula mass = 40.) needed to make 1.0 liter of a 0.20 M solution?
(1) 20. g (2) 2.0 g (3) 80. g (4) 8.0 g
Answer:
8 gram
Explanation:
in case of NaOH, normality=molarity
so normality=molarity×acidity or basicity(in case of NaOH it's 1)
then
weight of NaOH required = volume in ml × equivalent weight × normality / 1000
so
1000× 40× 0.2/1000
=8 gram
The total mass of sodium hydroxide (NaOH) needed to make the solution is 8 g (Option 4)
How to determine the mole of NaOH Volume = 1 L Molarity = 0.2 MMole of NaOH =?Molarity = mole / Volume
0.2 = mole of NaOH / 1
Mole of NaOH = 0.2 mole
How to determine the mass of NaOH Mole of NaOH = 0.2 mole Molar mass of NaOH = 40 g/mol Mass of NaOH =?Mass = mole × molar mass
Mass of NaOH = 0.2 × 40
Mass of NaOH = 8 g
Learn more about molarity:
https://brainly.com/question/15370276
why couple use a method of birth control
Answer:
because it will control the birth of a child which can happen alot being overpopulated in the country or world. It also can mange their life and create a small and happy and healthy family.Also the child can get more love and support from their parents if they have less children and it wont be a taruma for the couple as well. because growing a child can be expensive time costly and really hard.
plz mark me as a brainlest a and thanks my answer
Explanation:
and btw i think the subject should be biology not chemestry
the name for the following formula C9H18 should be
O octane
O octene
O nonane
O nonene
To determine whether Gd-daa3 is selective for Zn2 , researchers compared relaxivity measurements of Gd-daa3 in the presence of different cations. Varying amounts of XCl2 (where X is Zn, Ca, or Mg) were added to a 0.1 mM solution of Gd-daa3 plus 10 mM KCl/10 mM HEPES buffer at pH 7.4. What is the most appropriate control for this experiment
Most strong electrolyte solutions are not ideal so that the measured value of the van't Hoff factor i is _____ than expected from the formula of the compound. This is because ions in solution are not totally isolated from each other, but remain clustered together to form an ionic atmosphere. This _____ the effective concentration of particles and therefore the measured value of i.
Answer: Van't Hoff factor, i is less than expected from the formula of the compound and this decreases the effective concentration of particles.
Explanation:
Strong electrolytes are defined as the solutions which completely dissociate into their ions.
But, most of the strong electrolytes do not dissociate completely (act ideally) but remain partially undissociated into the ions. Thus, giving a lesser number of ions in the solution than expected.
This means that the Van't Hoff factor, i which denotes the number of ions is less than expected.
As fewer ions are released in the solution, the concentration of the solution is expected to decrease.
Hence, van't Hoff factor, i is less than expected from the formula of the compound and this decreases the effective concentration of particles.
what is photosynthesis?
Answer:
the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
Explanation:
Hope it helps
[tex]\bf{\underline{\underline{PHOTOSYNTHESIS }} }[/tex]
Photosynthesis is a chemical reaction that takes place inside a plant, producing food for the plant to survive.Carbon dioxide, water and light are all needed for photosynthesis to take place.Photosynthesis happens in the leaves of a plant.Substances that have a pH
7 are considered acidic.
Answer:
False because pH value below 7 are considered acidic.
Answer:
Any solution that has a pH of less than 7 is considered acidic, and anything above a pH of 7 is basic .
Explanation:
As the waves travel across the pan, matter is transported and hits the side of the pan
true or false?
Identify the principle of separation.
i. raw rice and lentils
ii. sulphur and iron filings
ii. sand and sawdust
iv. oil and water
v. ammonium chloride, salt and sand
Explanation:
I. husking
ii. use magnet
III. husking
iv. floatation
v. Fractional distillation
A. Acid rainfall will cause a decrease in oceanic surface temperatures.
O B. Increased atmospheric carbon dioxide will cause increased ocean surface temperatures.
O C. Any measurable increase in ocean surface temperatures must be caused by human activites.
OD. Saturation of nitrogen in the atmosphere will cause a wide range of ocean surface temperatures.
(PLEASE HELP ME)
Answer:
Increased atmospheric carbon dioxide will cause increased ocean surface temperatures.
Explanation:
Greenhouse gases of which CO2 is a typical example are known to cause a gradual and steady increase in the surface temperature of the earth by trapping infrared rays close to the surface of the earth.
As the surface temperature of the earth rises, the surface temperature of the oceans rises also leading to the tendency towards hurricanes.
Hurricanes are violent storms which are known to form near the equator over warm ocean waters.
Hence, increased atmospheric carbon dioxide will cause increased ocean surface temperature which in turn increases the chances of the occurrence of hurricanes.
For the reaction, Cl2 + 2KBr --> 2KCl + Br2, how many moles of potassium chloride, KCl, are produced from 102g of potassium bromide, KBr (MM: 119.002 g/mol)?(answer has 3 decimal places)
Solution :
From the balanced chemical equation, we can say that 1 moles of KBr will produce 1 moles of KCl .
Moles of KBr in 102 g of potassium bromide.
n = 102/119.002
n = 0.86 mole.
So, number of miles of KCl produced are also 0.86 mole.
Mass of KCl produced :
[tex]m = 0.86 \times Molar \ mass \ of \ KCl\\\\m = 0.86 \times 74.5 \ gram \\\\m = 64.07\ gram[/tex]
Hence, this is the required solution.
Describe the trends in properties of chlorides across period 3 .Their formula .Their state .Their volatility .Their structure .The ph of aqueous chloride solution
Answer:
See explanation
Explanation:
Period 3 elements include; Na, Mg, Al, Si, P,S,Cl and Ar
Across the period, the chlorides of the elements change from solid to gas. The chlorides of metals are solid while the chlorides of non metals are gaseous.
Also, the chlorides become more volatile across the period. The formulas of the chlorides change from MCl to MCl2 to MCl3 to MCl4, MCl5 and MCl6 respectively across the period where M is a period 3 element.
The pH of the solutions of chlorides of period 3 elements change from neutral to acidic across the period. The pH of the chlorides of metals are neutral while the chlorides of the nonmetals usually yield acid solutions.
metals and their ore
Answer:
Zinc
Zinc blende
(ZnS)
-----------------
Lead
Galena
(PbS)
-----------------
Mercury
Cinnabar
(HgS)
----------------
Copper
Copper glance
(Cu2S)
-------------------
Explanation:
Had to learn this for a test
Also, I plead the 5th
Which of these takes place when a chemical change occurs?
A. Bonds connecting atoms in products and reactants form.
B. Bonds connecting atoms in products and reactants break.
C. Bonds connecting atoms in reactants break, and bonds connecting atoms in products form.
D. Bonds connecting atoms in reactants form, and bonds connecting atoms in products break.
Answer:
In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.
Explanation: