Answer:
3 significant figures
Explanation:
Zeros that come before any non-zero digits are never significant.Zeros that are in between any non-zero digits are always significant.Zeros that come after any non-zero digit are ONLY significant if a decimal point is present somewhere in the number. (In this case there is a decimal point.)I underlined the significant figures in this number:
0 . 0 0 1 3 0
What is the temperature of 0.500 moles of helium that occupies a volume of 15.0 L at a pressure of 1.6 atm?
Answer:
600K
Explanation:
PV=nRT
T=PV/nR
= 1.6atm* 15.0L/ 0.5mol*0.0821LatmK^-1mol^-1
=600K
2. Sulfur dioxide (SO2) gets blasted out of volcanoes and reacts with oxygen (O2) in our
atmosphere to produce sulfur trioxide (SO3). If 128 grams of sulfur dioxide reacts with
oxygen in the atmosphere and 160 grams of sulfur trioxide (SO3) is produced, how many
grams of oxygen originally reacted?
SO2 + O2= SO3
Which statement describes the formation of metamorphic rocks?
Rocks beneath the surface melt.
Rocks above the surface are eroded.
Rocks beneath the surface are forced toward the mantle.
Rock layers near the surface decrease pressure on layers beneath them.
Answer:
rocks beneath the surface melt seems like the answer that makes the most sense
Answer:
Rocks beneath the surface melt
Explanation:
If an atom has 29 electrons and a mass of 64, and it is neutral, what is the name of the atom?
Explanation:
Copper has an atomic number of 29, so it contains 29 protons and 29 electrons. ... The atomic weight of copper is 64; it has 29 protons and 35 neutrons.
A company employs several high school students in its food-packaging factory. All the students are below 17 years of age. Which act prohibits
the employment of such persons?
OA. Occupational Safety and Health Act
OB. Fair Labor Standards Act
OC. Perishable Agricultural Commodities Act
OD. Homeland Security Presidential Directives
Answer:
Fair Labor Standards Act
Explanation:
It is correct. I just took the test on Clever
Answer:
I would say it’s B
Explanation:
Balancing
equations
• Check that the Synthesis reaction is selected and
that all coefficients are set to one. (The
coefficients are the numbers in the boxes.)
Introduction: The equation H, + O, H,O is unbalanced because there are two oxygen atoms
on the reactants side of the equation, and only one on the products side of the equation. To
balance the equation, you cannot change the structure of any of the molecules, but you can
change the number of molecules that are used.
Question: How are chemical equations balanced?
1. Balance: Tum on Show histograms. The equation is balanced when there are equal
numbers of each type of atom represented on each side of the equation.
In the Gizmo, use the up and down arrows to adjust the numbers of hydrogen, oxygen, and
water molecules until the equation is balanced. When you are done, turn on Show
summary to check your answer.
Write the balanced equation here:
H2+
Н,0
to see other
Synthesis of reaction can be done by adding two or more reactants to form a product.
The chemical equation are balanced according to the law of conservation of mass. It means that the mass of products on the right side should be equal to the mass of reactants on the left.When the number of the product and reactants are equal on both the sides than the equation is said to be balanced.Equation for the water can be balanced as follow:
[tex]2H_{2} + O_{2} = 2H_{2}O[/tex]
The atoms of hydrogen are balanced on both the sides, also the oxygen are balanced.
To learn more about balancing the equation follow the given link:
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True or false? the outermost electrons in a metal atom are free to move throughout the whole structure of the metal?
Which statment correctly decribes a law?
can be changed or replaced
is a factual statment
is not based on observations
2) Which one
more active in between
Li and Na and why ?
IS
Answer:
sodium(Na) is more active between Li and Na because is larger in size. Outermost electrons are less tightly held in sodium than in lithium. As a result, sodium loses its outermost electron more easily than lithium.
.Which term best describes the important pieces of information that scientists gather and record during an experiment?
conclusions
data
research
supplies
Answer: Data
Explanation:
The answer is data because data is important pieces of evidence that is collected in a table or a graph.
Answer:
B. Data
Explanation:
Cuz is said so duh
Any ions with a charge (3+ ) has?
Answer:
protons
Explanation:
The electrolyte that is used to make Hypochlorous Acid is made from Sodium Chloride (NaCl). the bottle says that the electrolyte solution contains 25% sodium chloride. If 2.4 ounces of the solution is added to the half gallon to prepare for the reaction. How many total grams of sodium chloride are used in the reaction. If the reaction produces 1100 PPM of HOCl (hypocholorus acid) how many grams of Hypocholrous are made? Do you think all the NaCl was converted to HOCl? or we can brew one more time and get more HOCl. If all of the NaCl converts to HOCl what would be the maximum possible PPM of the disinfectant
Answer:
63.9 grams. Yes, the Nacl was converted. Maximum possible ppm is 540ppm.
Explanation:
I this is college level chemistry not regular high school chem.
Answer:2
Explanation:
it is it do not ask questions
How many moles are in a sample of 32.6732 g of lead ?
Answer:
0.157689 moles
Explanation:
Carbon-14
What is the name of this element?
What is the mass number of this element?
What is the atomic number of this element?
How many;
Protons?
Neutrons?
Electrons?
what is boiling point.
Answer:
"the temperature at which a liquid boils and turns to vapor." - Google Dictionary
formula that represents a substance that is a mixture
]Answer:
[tex] H_2O + Mg [/tex]
Explanation:
A mixture is made up of two or more substances or constituents, which combine physically and can be easily separated. In a mixture, each constituent still maintains its identity and property in the combination.
Among the options given, the formula [tex] H_2O + Mg [/tex] represents a mixture of Water and Magnesium. This is a typical example of a substance that consists of 2 different substances that are combined physically.
Density = 2 g/ml
Volume = 20 ml
What is the mass?
Answer:
The answer is 40 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 20 mL
density = 2 g/mL
The mass is
mass = 20 × 2
We have the final answer as
40 gHope this helps you
When 1.20 moles of MgO reacts as completely as possible with 0.900 moles of NaCl, the total number of moles of reaction products is:
MgO (s) + 2 NaCl (aq) → MgCl2 (aq) + Na2O (aq)
Answer:
Explanation:
limiting reactant is NaCl it is consumed completely)
calculate n for each product
n NaCl (mole ) n MgCl2(mole )
2 1
0.9 x
x = 0.45 mole
n NaCl n Na2O
2 1
0.900 x
x = 0.45 mole
the total number of moles of reaction products is: 0.45 + 0.45= 0.9mol
Water and salt are compounds made of the combination of more than one type of atom. Which statement is false?
Answer:
This statement is correct
Explanation:
Water is made up of 2 hydrogen atoms and 1 oxygen atom while salt is made up of 1 atom of sodium and 1 atom of chloride
:)
Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus.
Sodium’s electron affinity value is more negative than the electron affinity value of phosphorus.
Phosphorus’ electron affinity value is more negative than the electron affinity value of sodium.
This information cannot be determined using the periodic table.
Answer:
Phosphorus’ electron affinity value is more negative than the electron affinity value of sodium.
Explanation:
I got it correct
Answer:
Phosphorus’ electron affinity value is more negative than the electron affinity value of sodium
Explanation:
i got it right
How do I solve Convert 496 cm to meters
Answer:
4,96 m
Explanation:
100 cm =1m
496 cm =4, 96 m
Which statement best explains why water has a higher boiling point than ethane?
Ethane molecules are smaller than water and can move faster.
Water molecules need relatively less heat energy to move.
Water molecules form hydrogen bonds, which cannot be broken by heating water.
Ethane molecules have no hydrogen bonds and need less energy to separate.
Answer:
Ethane molecules have no hydrogen bonds and need less energy to separate.
Explanation:
Ethane: has no hydrogen bonding, it has low melting, boiling points, and is a gas at room temperature.
Water: has strong hydrogen bonding between H and O, has relatively high melting and boiling points.
Statement that explains the relationship between boiling point of water and ethane and how the boiling point of water is higher than ethane is D:Ethane molecules have no hydrogen bonds and need less energy to separate.
The boiling point of water is usually high compare to that of ethane because of the hydrogen bonds present in water which is a electromagnetic attraction between hydrogen atom electronegative atom of Oxygen.And which this requires so much energy to break unlike ethane that doesn't contain any hydrogen bond.
Therefore, option D is correct.
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Potassium (K) and calcium fluoride (CaF2) can both be classified as
(Please help)
Which of the following is NOT one of the 6 basic elements of life?
A. Oxygen
O B. Potassium
C. Carbon
D. Hydrogen
Answer:
B
Pottasium is very good for your body, but for humans to live, we necessarily do not really need potassium. Answer should be B.
0.5 gm of mixture of NH4Cl and NaCl was boiled with 25 ml of 0.95 N NaOH in a vessel till all the ammonia is expelled.The residual solution is cooled and then made up to 100 ml.It was found that 10 ml of the diluted residual solution neutralised by 16 ml of 0.1 N (F=1.06)H2SO4. Calculate the % of pure NH4Cl in the mixture.
Ans:72.66%
Answer:
72.66%
Explanation:
NH₄Cl reacts in presence of NaOH producing ammonia, NH₃, as follows:
NH₄Cl + NaOH → NaCl + NH₃ + H₂O
The residual NaOH reacts with H₂SO₄ as follows:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O.
The equivalent-gram of H₂SO₄ are:
16mL * 0.1N * 1.06 = 1.696mEq.
As the complete residual solution is 100mL but the neutralization was made only with 10mL, the mEq you need to neutralize the residual NaOH is:
1.696mEq * (100mL / 10mL) = 16.96mEq.
The mEq of NaOH you add in the first are:
25mL * 0.95mEq = 23.75mEq
That means the NaOH that reacts = moles of NH₄Cl is:
23.75mEq - 16.96mEq = 6.79mEq = 6.79mmoles NH₄Cl =
6.79x10⁻³ moles NH₄Cl
In grams (Using molar mass NH₄Cl = 53.5g/mol):
6.79x10⁻³ moles NH₄Cl * (53.5g / mol) =
0.3633g of NH₄Cl are in the original mixture.
% is:
0.3633g/ 0.5g * 100 = 72.66%
The percentage of pure NH₄Cl in the mixture = 72.66%
Given data :
0.5 gm of mixture of NH₄Cl and NaCI
25 ml of 0.95 N NaOH
Determine the % of pure NH₄Cl in the mixture
Given that the reaction equation of the mixture is ;
NH₄Cl + NaOH ----> NaCl + NH₃ + H₂O
And the residual solution reaction with H₂SO₄ is
2NaOH + H₂SO₄ ----> Na₂SO₄ + 2H₂O.
∴ H₂SO₄ ( equivalent gram ) = 16mL * 0.1N * 1.06 = 1.696
but the equivalent gram of H₂SO₄ required to neutralize NaOH = 1.696 * ( 100 mL / 10 mL ) = 16.96
NaOH⁻ = 25mL * 0.95 = 23.75mEq ( from the first reaction equation )
next step : Determine the number of moles of NH₄Cl
moles of NH₄Cl = 23.75- 16.96 = 6.79 * 10⁻³
Final step : Calculate the % of pure NH₄CI in the mixture
moles of NH₄Cl = 6.79 * 10⁻³
molar mass of NH₄Cl = 53.5g/mol
∴ mass of NH₄Cl = 6.79 * 10⁻³ * 53.5 = 0.3633g
% of pure NH₄CI in the mixture = ( 0.3633 / 0.5 ) * 100 = 72.66%
Hence we can conclude that The percentage of pure NH₄Cl in the mixture is 72.66%
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Two samples of matter differ in temperature by 20°C. Describe
the difference in temperature of these two samples using the
Kelvin scale.
Given :
Two samples of matter differ in temperature by 20°C.
To Find :
The difference in temperature of these two samples using the Kelvin scale.
Solution :
Let , initial and final temperature is [tex]T_i[/tex] and [tex]T_f[/tex] .
So , [tex]T_f-T_i=20^oC[/tex] .
Now , temperature in kelvin is given by [tex](T_i+273)[/tex] and [tex](T_f+273)[/tex] .
So , difference between them is :
[tex]=(T_f+273)-(T_i+273)\\\\=T_f-T_i\\\\=20\ K[/tex]
The difference in temperature of these two samples using the Kelvin scale is 20 K .
Therefore , the magnitude of difference in kelvin and Celsius is same .
Hence , this is the required solution .
*BRAINLEST* is a solution an element, compound, homogenous mixture, or heterogeneous mixture?
Which ions produce similar colors in the flame tests?
Answer:
Two ions that produced similar colors in the flame test were Ca+2 and Sr+2. 3.
Explanation:
The colors are produced when an electron jumps to a higher level and then jump back down.
Ba2+ and Cu2+ and Sr2+ and Li+ were the pair with the similar color. Sr and Li displayed red colors, while Ba and Cu had mild greenish yellowish hues.
Why do some ions in the flame test generate colors that are similar?
The precise sizes of the potential energy jumps differ from metal to metal. As a result, the flame color of each metal will differ due to its unique spectral line pattern. The movement of the electrons in the metal ions contained in the compounds results in the hues of the flame.
The energy released by each electron when it returns to its initial condition determines the hue of the light that is produced.
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#SPJ2
If 175 undecayed nuclei remained from a sample of 2800 nuclei, how many half-lives has passed? *
Answer:
209
Explanation:
Answer:
Four half lives
Explanation:
if I fertilize my plants they will grow taller is a certain conclusion data-analysis hypothesis or scientific observation
