Answer:
Selenium
Explanation:
The mole fraction of NaCl in an
aqueous solution is 0.132. How
many moles of NaCl are present in
1 mole of this solution?
Answer: .132
Explanation:
If we add 20g of salt to 150g of water, what is the concentration by mass of the solution?
Answer:
11.76% by weight in salt
Explanation:
concentration = mass of solute / mass of solute + mass of solvent
mass of solute = 20 grams
mass of solvent = 150 grams
mass of solute + mass of solvent = 20g + 150g = 170g
concentration (weight %) = (20g / 170g)100% = 11.76% by weight in salt.
Identify the reaction that would possibly make a good
airbag inflator.
a. Fe (s) + S (s) - Fes (s)
b.CH, (g) + 20 (g) - CO, (g) + 2H,0 (
c. Cao (s) + H20 (1) - Ca(OH), (s)
d. 2KCIO, (s) - 2KCl(s) + 30 (9)
Answer:
D
Explanation:
Cuz i got it wrong and this was the right answer : )
The best reaction that would possibly make a good airbag inflator is the reaction in which CO2 is produced.
An airbag refers to certain objects that are put into vehicles to ensure that the occupants of the vehicle do not bump against objects that are within or outside the vehicle when there is a collision.
Since a good airbag must contain substances that quickly react to produce a non-combustible gas that fills up the airbag in order to cushion the effect of a collision, the best reaction that would possibly make a good airbag inflator is the reaction in which CO2 is produced.
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I NEED THIS ASAP!! Select all that apply.
Air pollution particles may be removed by _____.
oceans
natural cycles
soil
rain
snow
wind
Answer:
Natural Cycles
Explanation:
Most sulfur oxides are produced by burning: coal
Air pollution particles may be removed by _____. rain snow wind natural cycles
The three primary sources of air pollution are _____. factories cars electric power plants
The two basic types of air pollutants are _____. gases particulates
May I get brainliest please?
CaC12 * 3H20 is correctly named
a.
Calcium chloride trihydrate
b.
Calcium Dichloride tri water
Calcium chloride trihydrogen dioxide
d.
none of the above
Answer:
calcium chloride deihydrate
From the balanced reaction:
B2H6 + 3O2 ⇒ 2HBO2 + 2H2O
How many moles of O2 will be needed to burn 36.1 g of B2H6?
Answer:
The mass of O₂ that will be needed to burn 36.1 g B₂H₆ is 125.29 g.
What is the rate of acceleration caused by gravity?
Answer:
The numerical value for the acceleration of gravity is most accurately known as 9.8 m/s/s.
If we add 150mL of ammonia to 150mL of water, what is the concentration by volume?
Answer:
buffer solution
Explanation:
Explain:Will the bag of dog food be easier to lift?
Answer: Registered. My 65 pound dog and my 20 pound dog share an 18 pound bag of 4Health and it lasts them 3 and 1/2 weeks.
Explanation:
Answer:
Well it depends how much the bag weighs in LB and your strength.
Explanation:
How many total atoms are in 12 NaBr?
You bought a balloon for a birthday party in January. It was so cold outside that you ran into the house and forgot the balloon in the car. You go out to the car a few hours later and get the balloon. You noticed that the balloon was a little deflated. Once you brought the balloon into the house, after about 20 minutes, the balloon was back to normal.
Part A: Explain what happened to cause the balloon to deflate and then inflate. Be sure to use unit vocabulary and specific details to support your answer.
Part B: Using the information you provided in Part A, explain what would happen if you left an inflated balloon in the car on a very hot summer day.
Answer:
Part A: When air is left in specific environments, it can either expand or contract depending in the given environment, so, if left in a cold car for a few hours, the air inside said balloon will contract.
Part B: If left in said car on a very hot summer day, the air in said balloon will expand, and if left in said car long enough, said balloon will explode due to the air inside expanding
Hope this helped!
If 2.2 moles of calcium oxide are decomposed, how many moles of oxygen are produced?
2CaO --> 2Ca + O2
Answer: Since the reaction is 2Ca(NO3)2 = 2CaO + 4NO2 + O2
1) - given the stoichiometric coefficients, we know that 2 moles of Ca(NO3)2 will produce 4 moles of NO2, hence, 1 mole will produce 2 moles of NO2
2) - 328 g produces 22.4 L, since One mole of any gas at S.T.P. occupies the same volume which is 22.4 L.
Hence, 65.6 g produces (65.6*22.4)/328 = 4.48 L
3) - 328 g produces 112 g CaO. Therefore, 65.6 g produces = (65.6*112)/328 = 22.4 g CaO.
4) - Given the stoichiometric coefficients, we know 5 moles of gaseous products are already being produces ( 4+1) by 2 moles of reactant.
5) - 44.8 L at STP = 2 moles of NO2, since One mole of any gas at S.T.P. occupies the same volume which is 22.4 L.
Hence, to produce 2 moles of NO2, we need 1 mole of reactant = 164 g
Hope this helps :)
Explanation:
is the charge of a nucleus positive ,negative or neutral ?what about the charge of an atom ?
Answer:
it is positive
Explanation:
due to that is how it is
Answer:
The nucleus is a positively charged region at the centre of an atom . The particles are protons , which have a positive electric charge , an neutrons, which are neutral in electric charge.
An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons . The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral . The nucleus of an atom contains protons and electron .
Plants and animals depend on glucose (C6H12O6) as an energy source. Calculate the number of moles of each element in 1.25 mol C6H12O6.
Answer:
15 mol.
Explanation:
trust
Mole measure the number of elementary entities of a given substance that are present in a given sample. Thereofre, the number of moles of each element in 1.25 mol C6H12O6. 1.25 mol of carbon, 1.25 mol of hydrogen and 1.25 mol of oxygen.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
1.25 mol C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_6[/tex], contains 1.25 mol of carbon, 1.25 mol of hydrogen and 1.25 mol of oxygen. So, total sum of mol of each element is equal to 4.5 mol.
Therefore, the number of moles of each element in 1.25 mol C6H12O6. 1.25 mol of carbon, 1.25 mol of hydrogen and 1.25 mol of oxygen.
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Look at the periodic table below. Which of the following lists of elements forms a group on the periodic table?
periodic table
Group of answer choices
Sc, Ti, V, C
Answer:
I'm not totally sure but I think that it is C-carbon
Explanation:
because its in the area of +1+2+3 4 -3 -2 -1
A student puts some cooking oil and some water in a boiling tube and shakes it.
She then examines it carefully.
The oil and water separate out, with the oil floating on top of the water.
Shaking it harder produces the same result.
Explain what this experiment shows.
Answer:
The experiment shows that oil is less dense than water
Explanation:
If an object is less dense than water, it will float when placed in water, if an object is denser than water it will sink when placed in water.
The experiment shows that oil is less dense than water and so, the oil and water separate, with the oil floating on top of the water as a student puts some cooking oil and some water in a boiling tube and shakes it.
he chemical formula for lithium hydride is LiH A chemist determined by measurements that 0.0800 moles of lithium hydride participate in a chemical reaction. Calculate the mass of lithium hydride that participates. Be sure your answer has the correct number of significant digits.
CAN SOMEONE HELP PLEASE
The mass of lithium hydride that participates in the chemical reaction is 6.35 grams.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles by its molar mass as follows:
mass (g) = no of moles (mol) × molar mass (g/mol)
According to this question, the chemical formula for lithium hydride is LiH. A chemist determined by measurements that 0.0800 moles of lithium hydride participate in a chemical reaction.
Molar mass of LiH = 6.941 + 1 = 7.94g/mol
mass = 0.8mol × 7.94g/mol = 6.35grams
Therefore, 6.35g is the mass of the lithium hydride.
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Find the amount of heat (Q) needed to raise the temperature of 5.00 g of a substance from 20.0 C to 30.0C if
the specific heat of the substance is 2.01 J/gC.
Answer:
100.5 J
Explanation:
What is the solution to the following equation? Your answer
should use the correct number of significant figures.
(1.239 + 2.36 + 6.7800) -3.25 =
Answer:
7.129
Explanation:
1.239+2.36.6.7800
how does lanthanide contraction influence the density of period 6 transition element
Answer:
For example, the atomic radius of the metal zirconium, Zr, (a period-5 transition element) is 155 pm (empirical value) and that of hafnium, Hf, (the corresponding period-6 element) is 159 pm. ... The increase in mass and the unchanged radii lead to a steep increase in density from 6.51 to 13.35 g/cm3.
Explanation:
what is the importance of knowing how to identify structural formula of a compound?
Answer:
Structural formulas are helpful because they explain the properties and structure of the compound which empirical and molecular formulas cannot always represent.
Explanation:
HOPE ITS HELPFUL FOR U
Rutherford's alpha particle scattering experiment was responsible for the discovery of
Answer:
Atomic Nucleus
Explanation:
Atomic Nucleus
How much of the total mass of the solar system is contained in the Sun?
27.3%
55.7%
75.2%
99.8%
Answer:
99.8%
Explanation:
Answer: 99.8%
Explanation:
Sun Facts. The Sun is the largest object within our solar system, comprising 99.8% of the system's mass. The Sun is located at the center of our solar system, and Earth orbits 93 million miles away from it. Also the sun is the hottest star in the ENTIRE galaxy :)
im completely finish why is it at 99.5 instead of 100??
Answer:
because u need one more assianment before it becomes 100
Explanation:
10.Give an example of an adaptation in birds, where shape of beak is related to the eating habits of that bird.
Answer:
It isn't only for the eating habits but also for building nests, hunting small insects, birds, other creatures including defence. Birds have a narrow small throat so the beak helps ripping off small peices of a big animal l(small bird) and for insects they crush and swallow it, they se their beak for feeding their children by grinding food in their beak and transferring it to the youngsters mouth
Someone please answer this in like 40 minutes
Before it’s due. Explain the answer too
Answer:
kkkwkisa
Explanation:
wulaoaiq8qiIq8qiaik
Complete the calculation to find the mass of 1 mole of water (H2O). Use the atomic weights given in the periodic table. Select the correct option from each drop-down menu.
Answer:
2x( 1.008 g/mol) +1 x (15.999 g/mol) = 18.015 g/mol
Explanation:
The mass of 1 mole of water (H2O) is 2x( 1.008 g/mol) +1 x (15.999 g/mol) = 18.015 g/mol
What is the mole of one mole of water?
One mole of water is about 18 milliliters.
This is the volume of a few drops of water, 3.65 teaspoons, 1.2 tablespoons, or 0.018 liters. It's not a large volume, yet it contains 6.022 x 1023 water molecules! You can use the same steps to find the mass and volume of any other substance.
How many grams are there in 1 mole of water?18.02 g
So, one mole of water (6.022 x 10 23 molecules) has a mass of 18.02 g. One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.
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In 1976, what happened at Big Thompson Canyon in Colorado? *
Answer:
Flash Flood
Explanation:
On July 31, 1976, during the celebration of Colorado's centennial, the Big Thompson Canyon was the site of a devastating flash flood that swept down the steep and narrow canyon, claiming the lives of 143 people, 5 of whom were never found.
Which of the above most likely represents Thomson's model of the atom?
which of the following is unbalanced
A. SnO2 + H2 → Sn + 2 H2O
B. 2Na + 2H2O → 2NaOH + H2
C. N2O5 + H2O → HNO3
D. 2Fe + 3Cl2 → 2FeCl3
Answer:
The unbalanced chemical equation is;
C. N₂O₅ + H₂O → HNO₃
Explanation:
In balancing a chemical reaction equation, only the coefficients of the terms of the reactants and/or the products are adjusted (and not the subscripts to the atoms in the compounds) to ensure that the total number of each element is the same on either side of the arrow for the chemical reaction
A coefficient term is the number multiplier of the compounds and elements in a chemical reaction
Therefore, the balanced chemical equation is obtained by changing the coefficient of the product from the implied '1' to a '2' as follows;
N₂O₅ + H₂O → 2HNO₃
