Answers
Related Questions
In the first 21.0 s of this reaction, the concentration of HBr dropped from 0.550 M to 0.506 M . Calculate the average rate of the reaction in this time interval.
Answers
Answer:
1.048x10⁻³M/s is the rate of reaction
Explanation:
Based on the reaction:
2HBr → H₂ + Br₂
The rate of reaction is defined as:
1/2 Δ[HBr] / Δt
1/2 because the reaction is consuming 2 times HBr per mole of reaction
Where Δ[HBr] is 0.550M - 0.506M = 0.044M
And Δt is 21.0s. The average rate of reaction is:
1/2 0.044M / 21.0s =
1.048x10⁻³M/s is the rate of reactionA forest area is being used for a new housing development. Most of the trees have been removed to make room for the
new houses, Predict the impact that this will have on the birds in the area.
Answers
Answer:
The correct answer would be - lose their native habitats are forced to migrate into new areas in search of shelter and food.
Explanation:
The removal of trees or deforestation to build a housing or city planning or development impact the birds and other animals of that area. Cutting most of the trees from the area will result in a decrease in available food, shelter, and breeding habitat.
It causes complete removal of bird species and forced them to migrate to a new place in search of places that will provide a source of shelter and food for birds.
What is the number of electrons in an atom that
has 3 protons and 4 neutrons?
(1) 1
(3) 3
(2) 7
(4) 4
Answers
Answer:
(2)
Explanation:
Answer:
7 is answer.
Explanation:
therefore, the mass number of an atom with 3 protons,4 neutrons,and 3 electrons is 7.
I hope it's helpful!
Why is the earth atmosphere located above earth crust
Answers
Answer:
The atmosphere is the thin envelope of gas molecules surrounding the Earth; it is held down by Earth's gravitational pull. The atmosphere is concentrated at the Earth's surface and rapidly thins as you move upward, blending with space at about 100 miles above sea level
Explanation: science
Answer:
Öncelikle burda soru Why is the earth atmosphere located above earth crust yani Türkçe olarak Dünya atmosferi neden yer kabuğunun üzerinde yer alıyor diyor
A cupcake recipe designed to produce 18 cupcakes calls for 260 grams of
flour. Determine the quantity of flour that would be required to make 22
cupcakes. (Round the final answer to four decimal place.)
Answers
Answer:
317.7778 g
Explanation:
Given data:
Flour required for 18 cup cakes = 260 g
Flour required for 22 cup cakes = ?
Solution:
We will calculate the flour required for 1 cup cake.
260 g /18 = 14.4444 g
Fluor required for 22 cupcakes,
22× 14.4444 g = 317.7778 g
In short,
22 cupcake/18 cup cake×260 g = 317.7778 g
The Xs show the location of beanbags a student tossed at a target. The
student was aiming for the center circle. Which words best describe the
student's results?
A. Low precision, low accuracy
O B. High precision, low accuracy
O C. High precision, high accuracy
O D. Low precision, high accuracy
Answers
Answer:
It is D low precision, high accuracy
Explanation:
I got it correct
The Xs show the location of beanbags a student tossed at a target. The student was aiming for the center circle. Low precision, high accuracy best describe the student's results. Therefore, option D is correct.
What is precision ?There are two ways to assess observational error: accuracy and precision. Precision measures how closely two measurements are to one another, whereas accuracy measures how close a group of measurements is to its actual value. In other words, precision is a measure of statistical variability and a description of random errors.
The proximity of two or more measurements to one another is referred to as precision. Using the aforementioned example, your measurement is extremely accurate if you weigh a certain substance five times and obtain 3.2 kg each time. Accuracy is not necessary for precision.
Regardless of whether or whether two or more measurements are correct, precision is described as "the property of being exact" and relates to how close two or more measurements are to one another.
Thus, option D is correct.
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7.08 moles of ammonia (NH3) is formed in the following reaction. How many grams of
hydrogen reacted?
3H2 + N2 + 2NH3
Answers
Answer:
Mass = 21.24 g
Explanation:
Given data:
Number of moles of ammonia = 7.08 mol
Mass of hydrogen reacted = ?
Solution:
Chemical equation:
3H₂ + N₂ → 2NH₃
Now we will compare the moles of ammonia and hydrogen.
NH₃ : H₂
2 : 3
7.08 : 3/2×7.08 = 10.62
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 10.62 mol × 2 g/mol
Mass = 21.24 g
A compound is found to contain 64.80 % carbon, 13.62 % hydrogen, and 21.58 % oxygen by weight. What is the empirical formula for this compound
Answers
Answer:
Empirical formula is C₄H₁₀O
Explanation:
Values for C, H and O are determined as centesimal composition.
64.80 g of C in 100g of compound
13.62g of H in 100 g of compound
21.58 g of O in 100 g of compound.
We convert the mass to moles:
64.80 g . 1mol/ 12g = 5.4 moles of C
13.62 g . 1 mol /1g = 13.62 moles of H
21.58 g . 1 mol/16g = 1.35 moles of O
We pick the lowest value and we divide:
5.4 moles of C / 1.35 = 4 C
13.62 moles of H / 1.35 = 10 H
1.35 moles of O / 1.35 = 1 O
Empirical formula is C₄H₁₀O, it can be the diethyl ether.
We confirm, the excersise is well done.
Molar mass = 74g/mol
74 g of compound we have (12 . 4)g of C
In 100 g of compound we may have (100 . 48) / 74 = 64.8 g
Water is one of the most important resources for humans. Some areas are known to have no water shortages, where other areas are now suffering the scarcity of water. List some factors that change the distribution of water abundance.
(written response)
Answers
Answer:
The factors are various, although there are main and accessories.
The main factor is the climate of the area, that is, if it is a rainier climate, there will be more water masses in the lands where this climate abounds (usually it is wet).
Other factors are: geographical features, flows, the path of rivers, lakes or lagoons, the presence or absence of ports, the number of trees and the distribution of rocks.
Explanation:
Another important factor is the height of the land, the higher the level of the earth, the more difficult it will be to accumulate water, this is how low areas are also flooded.
How many grams are in 4.63 x 1024
molecules of CCl4?
Answers
Answer:
[tex]m=1,182.8g[/tex]
Explanation:
Hello!
In this case, since the relationship between molecules and mass is first analyzed via the Avogadro's number to compute the moles in the given molecules:
[tex]mol=4.63x10^{24}molec*\frac{1mol}{6.022x10^{23}molec}=7.69mol[/tex]
We now use the molar mass of carbon tetrachloride (153.81 g/mol) to obtain the required grams:
[tex]m=7.69mol*\frac{153.81g}{1mol} \\\\m=1,182.8g[/tex]
Best regards!
A chemist adds of a M calcium sulfate solution to a reaction flask. Calculate the mass in grams of calcium sulfate the chemist has added to the flask
Answers
Answer:
1.23 g
Explanation:
A chemist adds 1.55 L of a 0.00582 M calcium sulfate solution to a reaction flask. Calculate the mass in grams of calcium sulfate the chemist has added to the flask.
Step 1: Given data
Volume of the solution (V): 1.55 LMolar concentration of the solution (C): 0.00582 M (0.00582 mol/L)Step 2: Calculate the moles (n) of calcium sulfate added
We will use the following expression.
n = C × V
n = 0.00582 mol/L × 1.55 L
n = 0.00902 mol
Step 3: Calculate the mass corresponding to 0.00902 moles of calcium sulfate
The molar mass of calcium sulfate is 136.14 g/mol.
0.00902 mol × 136.14 g/mol = 1.23 g
A sheet of aluminum foil has a volume of 0.555 cm3. If the foil measures 10.0 cm by 10.0 cm, what is the thickness of the foil?
Answers
Answer: B) 0.005 55 cm
Hope you have a blessed day!
which is the formula of nitrogen (I) oxide?
Answers
Answer:
Oxides of nitrogen are a mixture of gases that are composed of nitrogen and oxygen. Two of the most toxicologically significant compounds are nitric oxide (NO) and nitrogen dioxide (NO2). Other gases belonging to this group are nitrogen monoxide (or nitrous oxide, N2O), and nitrogen pentoxide (NO5).
Explanation:
A cube of tin that is 112 mm on each side has a mass of 8.21 grams. A single tin atom has a mass of 118.7 amu. How many tin atoms are in the cube? Report your answer in scientific notation with 3 sig figs. Use e for scientific notation, for example 100. would be written as 1.00e+2
Answers
Answer:
4.17e+22 atoms of tin are present in the cube
Explanation:
We don't require the size of the cube. With the mass and the molar mass of tin = 118.7 amu we can find moles of Tin. As 1 mol = 6.022x10²³ atoms we can find the number of atoms:
Moles Tin:
8.21g * (1mol / 118.7g) = 0.0692 moles Tin
Atoms Tin:
0.0692 moles Tin * (6.022x10²³ atoms / mol) =
4.17e+22 atoms of tin are present in the cube8. A moving truck is loading heavy furniture using a long ramp. Why does this simple machine make the work easier?
The ramp makes the furniture weigh less.
It takes less force to move the furniture up the long ramp.
The ramp acts like a lever to make the work easier.
The furniture fits on the ramp.
Answers
Ammonium phosphate is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid with ammonia . What mass of ammonium phosphate is produced by the reaction of of phosphoric acid
Answers
Answer:
4.3 g
Explanation:
Ammonium phosphate is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid with ammonia . What mass of ammonium phosphate is produced by the reaction of 2.8 g of phosphoric acid?
Step 1: Write the balanced equation
3 NH₃ + H₃PO₄ ⇒ (NH₄)₃PO₄
Step 2: Calculate the moles corresponding to 2.8 g of H₃PO₄
The molar mass of H₃PO₄ is 97.99 g/mol.
2.8 g × 1 mol/97.99 g = 0.029 mol
Step 3: Calculate the moles of (NH₄)₃PO₄ produced from 0.029 moles of H₃PO₄
The molar ratio of H₃PO₄ to (NH₄)₃PO₄ is 1:1. The moles of (NH₄)₃PO₄ produced are 1/1 × 0.029 mol = 0.029 mol.
Step 4: Calculate the mass corresponding to 0.029 moles of (NH₄)₃PO₄
The molar mass of (NH₄)₃PO₄ is 149.09 g/mol.
0.029 mol × 149.09 g/mol = 4.3 g
16.
Mg(OH)2 +
H.PO.-> ||||Mg(PO2 +
H2O
2,3,6,1
3, 3, 1,6
3, 2, 1,6
2,3,1,3
17. Cr+Fe(NO.)2 ->
Fe +_ Cr(NO3)2
4,6,6,2
0 2,3,2,3
0 1,3,3,1
02.3, 1.2
0 2,3,3,2
these are two questions separated but I would REALLY appreciate if someone could do them it’s for a test
Answers
Answer:
3,2,1,6
2,3,3,2
Explanation:
HOPE THIS HELPED
A person lifts a 10 N box 1 m off the ground in 1 s. How much power does she use? P = W/t
A. 100 W
B. 20 W
O C. 10 w
O D. 12 W
Answers
Answer:
C. 10 W.
Explanation:
Hello!
In this case, since the power the person uses to lift the 10-N load is computed by using the formula:
[tex]P=\frac{W}{t}[/tex]
Whereas W is the work and t the time; we can compute the work by multiplying the force applied in 1 m:
[tex]W=10N*1m=10J[/tex]
Now, we divide it by the time to obtain:
[tex]P=\frac{10J}{1s}=10W[/tex]
Since joules over seconds are watts.
Best regards!
What is the madd in grams of 0.40 moles of sodium borohydride, NaBH4
Answers
Answer:
Mass = 15.1 g
Explanation:
Given data:
Number of moles of NaBH₄ = 0.40 mol
Mass in gram = ?
Solution:
Formula:
Mass = number of moles × molar mass
Molar mass of NaBH₄ = 37.83 g/mol
By putting values,
Mass = 0.40 mol × 37.83 g/mol
Mass = 15.1 g
a. A container has a volume of 20 m3 and initially it contains 25 kg of methane at a pressure of 10 bar. Determine the specific volume in m3/kg. b. Add 5 kg of Ethane to the tank. What is the specific volume of the mixture in m3/kg
Answers
Answer:
a. 0.80 m³/kg
b. 0.67 m³/kg
Explanation:
a.
Step 1: Given data
Volume of the container (V): 20 m³
Mass of methane (m): 25 kg
Step 2: Calculate the specific volume (v) of methane
Specific volume is defined as the number of cubic meters occupied by one kilogram of matter.
v = V/m
v = 20 m³/25 kg = 0.80 m³/kg
b.
Step 1: Calculate the mass of the mixture
m = m(methane) + m(ethane)
m = 25 kg + 5 kg = 30 kg
Step 2: Calculate the specific volume (v) of the mixture
v = V/m
v = 20 m³/30 kg = 0.67 m³/kg
. When a person weighs himself in pounds, which system of measurement is he using?
Answers
Answer:
answer: Weight is a 'force' and in the imperial system, it is measured in pounds-force (lbf or lbf). You might hear this term used together with the term 'slug'. A slug has a mass of 32.174049 lb. Explanation:
Explanation:
The unit pound is a unit of mass which is from the British imperial units of measurements. Pound is not included in CGS or SI units of mass.
What is mass?Mass of a substance is its total amount which can be expressed in any units such as g, Kg etc. Our mass is affected by the gravity and thus the total weight of a body is mass multiplied by gravity.
There are different system for units and each units of a measurement is interrelated. Units are very significant in measurements and to identify the variables.
The most commonly used unit system is international system of units called the SI system. Where the mass length and time are in Kg, m and seconds. In CGS system it is gram, meter and seconds.
Pound is unit of mass from imperial unit system of britain. One pound = 0.4533 Kg.
To find more about unit systems, refer the link below;
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Atoms are the same thing as molecules
Question 2 options:
True
False
Answers
An atom can form a molecule but isn't a molecle.
explanation - atoms are a single neutral particles . molecules are neutral particles made of 2 or more atoms bonded together
what is smaller than atoms and bigger than molecule
Answers
Most favourable conditions for electrovalency are
(a) Low charge on ions, large cation and small anion
(b) High charge on ions, small cation and large anion.
(c)X High charge on ions, large cation and small anion
(d) Low charge on ions, small cation and large anion
bila da
Answers
Answer:
A: Low charge on ions, large cation and small anion
Explanation:
Electrovalency is defined as process of transfer of electrons from its valence shell from one atom to another to form ions in such a manner that both elements will achieve stable electronic configuration.
Now cations are positively charged ions and therefore the bigger the cation, the more electrons it looses and thus the more it favors Electrovalency.
While an ions are negative and the lesser they are the more they favor Electrovalency.
Thus, the correct answer is option A
PLS HELP ASAP THIS IS DUE IN 10 MINUTES I NEED NUMBER 3, 4 AND 5!
Answers
Answer:
1. B
2. A
3. E
4. D
5. C
Explanation:
*
Gravity affects the mass of a brick.
True
False
Answers
Answer:
True
Explanation:
Because anything that has mass also has gravity
2 3 5 6 7 Which best describes the reactants and products of photosynthesis? Reactants are formed inside the plant, and products are taken in from the environment by the plant. Reactants are taken in from the environment by the plant, and products are formed inside the plant. Reactants and products are formed inside the plant. Reactants and products are taken in from lite environment by the plant.
Answers
Answer:
reactants are taken in from the environment by the plant,and products are formed inside the plant.
Explanation:
Which body system or systems are affected by asthma?
Answers
Answer:
The lungs
Explanation:
Asthma is a disease that affects the airways of your lungs. With asthma, your airways' lining tends to always be in a hypersensitive state characterized by redness and swelling. Causing the airways to swell and, in severe cases, close completely off.
hope this helps, this should also probably be in biology:)
The cold water from deep in the ocean contains
Answers
Answer:
water... OH AND FISH
Explanation:
Answer:
Deep ocean water makes up about 90% of the volume of the oceans. Deep ocean water has a very uniform temperature, around 0-3 °C, and a salinity of about 3.5% or as oceanographers state as 35 ppt (parts per thousand).
Explanation:
Kp for the following reaction is 0.16 at 25 degree C. 2 NOBr(g) 2 NO(g) Br_2(g) The enthalpy change for the reaction at standard conditions is
Answers
Answer:
Explanation:
Given that:
[tex]2 NOBr_{(g)} \iff 2 NO_{(g)} + Br_{2(g)}[/tex]
From above:
[tex]K_p = 0.16 = \dfrac{(P_{NO})^2 (P_{Br})}{(P_{NOBr})^2}[/tex]
To predict the effect of the addition of Br₂(g);
The addition of Br₂(g) will favor the equilibrium to shift to the left i.e. formation of NOBr
The removal of some NOBr will cause the equilibrium position to shift to the left side. This is because concentration on the left side is decreased and the concentration on the right side will be increased. Thus, the equilibrium will shift towards where the concentration is reduced which is the left side.
