Answer:
1.24
Explanation:
According to the concept of significant figures, rounding off to 3 significant figures gives 1.24.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
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colloidal solution show tyndall effect but true solution do not explain
Answer:
Scattering of light through a solution when light passes through it is called Tyndall effect.
In a colloidal solution, the particle size is between 1 nm to 100 nm, when light rays fall on colloidal solution, these particles sizes allow scattering of light ray.
But in true solution the size of particles is smaller than 1nm and unable to scatter the light and do not show tyndall effect.
Hence, colloidal solution shows tyndall effect but true solution do not.
Where is aggregate generally found?
Answer:
They are generally found in mines
On which side of the periodic table are there alkaline metals?
Please help! I will give brainliest!
Answer:
left/center
Explanation:
Metals including, alkali metals, alkaline earth metals, and transition metals are all located on the left/center.
hope I helped!
Which part or parts of the paragraph indicate the relationship between public support and the enforcement of environmental policies?
A new manufacturing company was the brainchild of five engineers. They created a device that controls a company’s carbon footprints. To spread awareness for their own benefit, they proposed a legislative bill related to tracking and controlling carbon footprints. They constantly followed up with congressional representatives and found a sponsor and several co-sponsors for the bill.
Answer:
It is.. To spread awareness for their own benefit, they proposed a legislative bill related to tracking and controlling carbon footprints.
They constantly followed up with congressional representatives and found a sponsor and several co-sponsors for the bill.
Explanation:
The paragraph that indicates the relationship between public support and the enforcement of environmental policies are:
C. To spread awareness for their own benefit, they proposed a legislative bill related to tracking and controlling carbon footprints.
D. They constantly followed up with congressional representatives and found a sponsor and several co-sponsors for the bill.
What are environmental policies?Environmental policies are the policies made by the government to save the environment and animals from hunters, and predators. Environmental policies include preventive areas and rules for humans to behave in natural resources.
Thus, the correct options are C and D.
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Question 12
2 pts
A gas is initially at STP. When heated to 25°C what will the pressure be in atmospheres
assuming constant volume and moles?
Answer:
Pressure initially is 760 torr.
Temperature is at 273.15
Temperature is increased to 298.15
Pressure increases by a factor of 298.15 / 273.15 = 1.0915248032
760 * 1.0915248032 = 829.558850432 torr
Explanation:
If 10.0 liters of h2(g) at STP is heated to a temperature of 546 K, pressure remaining constant, the new volume of the gas will be
Answer:
20L
Explanation:
The following data were obtained from the question:
Initial volume (V1) = 10L
Initial Temperature (T1) = stp = 273K
Final temperature (T2) = 546K
Final volume (V2) =..?
The new volume of the gas can be obtained by using the Charles' law equation as shown below:
V1/T1 = V2/T2
10/273 = V2/546
Cross multiply to express in linear form
273 x V2 = 10 x 546
Divide both side by 273
V2 = (10 x 546) / 273
V2 = 20L
Therefore, the new volume of the gas is 20L.
How your life would be affected if there was no more electricity?
Answer:
Lots of bad things would happen
Explanation:
People would lose their jobs
People would fall out of contact (no phones)
It would be pretty dark (no streetlights)
You would have to learn everything by book or asking someone
ect.
Answer: My life would change drastically.
Explanation:
This is because electricity is used in my everyday life . If I no longer had electricity then i would have to change my whole life and how I did things . I would have to adapt to my new environment without electricity.
A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60.0 mL of a 0.100 M NaOH solution. The equation for the reaction is given below. HCl + NaOH Right arrow. NaCl + H2O What was the original concentration of the HCl solution? 0.040 M 0.25 M 1.50 M 2.50 M
Answer:
0.040M
Explanation:
The following data were obtained from the question:
Volume of acid (Va) = 150mL
Volume of base (Vb) = 60mL
Molarity of base (Mb) = 0.1M
Molarity of acid (Ma) =..?
Next, the balanced equation for the reaction. This is given below:
HCl + NaOH —> NaCl + H2O
From the balanced equation above,
The mole ratio of the acid (nA) = 1
The mole ratio of the base (nB) = 1
Finally, we shall determine the concentration of the acid, HCl as follow:
MaVa / MbVb = nA/nB
Ma x 150 / 0.1 x 60 = 1/1
Cross multiply to express in linear form
Ma x 150 = 0.1 x 60
Divide both side by 150
Ma = 0.1 x 60 / 150
Ma = 0.04M
Therefore, the concentration of the acid is 0.04M
Answer:
0.040M
Explanation:
just took the review
Which sentence describes energy?
O A. It measures changes in the temperature of an object.
B. It measures the speed at which an object is moving.
O C. It measures the capacity to do work.
D. It measures the amount of mass an object has.
Answer:
C
Explanation:
energy is measures the capacity to do work.
Answer:
C
Explanation:
APEX
Consider the nuclear equation below. 239/94 Pu—-> X+ 4/2 He. What is X?
Answer:
X = U (Uranium)
Explanation:
Pu-->235/92 U + 4/2 He
The element X which is involved in the given nuclear reaction is ²³⁵₉₂U.
What is radio active decay?Radio active decay is a process in which an unstable nuclei will emit some particles from the nuclei in the form of energy to get stability.
In the given chemical reaction, parent nuclei (²³⁹₉₄Pu) will emit the alpha particle (⁴₂He) which has a atomic number 2 and atomic mass of 4 as a result of which we get a daughter nuclei Uranium which will get the atomic number 92 and atomic mass of 235.
²³⁹₉₄Pu → ⁴₂He + ²³⁵₉₂U
Hence the element X is uranium (²³⁵₉₂U).
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21) Amines, amides, and amino acids are categories of *
1 pol
isomers
isotopes
organic compounds
inorganic compounds
Answer:
Organic compounds
Explanation:
I just did this question and apparently it’s that. (:
The correct answer is organic compounds.
Are amines, amides, and amino acids are organic compounds?Amines are organic molecules made up of a lone pair of nitrogen atoms.An amide is an organic functional group that has a carbonyl linked to a nitrogen, as well as any product that has this functional group.An amino acid is an organic compound composed of a basic amino group (NH2), an acidic carboxyl group (COOH), and a unique organic R group (or side chain).Learn more about organic compounds here:-
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PLEASE HELP!!
Describe the specific numbers measured and calculated. Restate the hypothesis and explain whether it was supported by
the data. Provide an example from the lab.
Answer:
To get from DNA, written in one chemical language, to protein, written in another, requires two major stages, transcription and translation.
Explanation:
I hope This Helps ^^!!! あなたの歓迎
why our clothes dry quickly when there is a breeze?
Explanation:
When the water evaporates from your clothes, it will "hang around" around it. If there is little or no air movement, this means that the air surrounding the fabric is saturated with moisture, which means it will not evaporate more. The breeze will move the moisture-saturated air away from the fabric, until more water evaporates.
Oxidation number of sulphur in H2SO4
Answer
let the oxidation of sulphur is x
2(+1)+x+4(-2)=0
+2+x-8=0
+2-8+x=0
-6+x=0
x=6
Explanation:
i hope this will help you:)
What is the molality of a solution that has 4 mol of KCI in 0.800 kg of water
Answer:
Option A. 4mol/0.800Kg
Explanation:
Data obtained from the question include:
Mole of solute = 4 moles
Mass of water = 0.800Kg
Molality =.?
Molality of a solution is simply defined as the mole of solute per unit kilogram of solvent. Mathematically, it is expressed as:
Molarity = mole of solute / Kg of solvent
With the above formula, we can obtain the molality of KCl solution as follow:
Molality = 4mol/0.800Kg
Answer: A
Explanation:
The number of particles in a mole is known as
If you spilled nails in a sand box what separation tool/method could you use to clean out the sandbox so it would be safe for children to play with it's:filter,screen,magnet,Evaporation
Answer: Magnet
Explanation:Using a magnet is the best separating technique to be deployed in this case. The nails are easily picked out by just holding a magnet over the sandbox.
What is the lowest energy level that contains d orbitals?
O A. 4
O B. 1
O c. 3
O D. 2
Answer: C. 3
Explanation: 3 is the lowest energy level that contains d orbitals.
The parts that are either directly or indirectly related to each other in a system are known as what?
A) the flow
B) the boundary
C) the components
D) the input
Answer:
C) the components
Explanation:
The term component is referred to as the distinctively recognizable part, piece, of a system that is required to complete a function, in that particular system. Moreover, it carries out a distinguishable and necessary function in the operation of a specific system. For example, a computer has a number of components that make it whole, and the most essential of them is the Central Processing Unit.
Answer:
c) the components
Explanation:
I took the quiz
Briefly define weather,season and Climate.
Answer:
this is an answer to your question in explanation
Explanation:
Weather is the atmospheric conditions, including the temperature, wind, snow, rain, or anything else happening outside
season is one of the four division in a calendar year
Climate is the longstanding average weather of an area.
Weather, state of the atmosphere at a particular place during a short period of time.
A season is a division of the year marked by changes in weather, ecology, and the amount of daylight.
Climate is defined as an area's long-term weather patterns.
How many grams of H2S is needed to produce 18.00g of PbS if the H2S is reacted with an excess (unlimited) supply of Pb(CH3COO)2?
Answer:
2.56g of H₂S
Explanation:
The reaction of H₂S with Pb(CH₃COO)₂ is:
H₂S + Pb(CH₃COO)₂ → 2 CH₃COOH + PbS
Where 1 mole of H₂S produce 1 mole of PbS
18.00g of PbS (Molar mass: 239.3g/mol):
18.00g of PbS ₓ (1mol / 239.3g) = 0.0752 moles of PbS
As 1 mole of PbS is produced from 1 mole of H₂S, moles needed of H₂S are 0.0752
As molar mass of H₂S is 34.1g/mol, mass in 0.0752moles is:
0.0752 mol H₂S ₓ (34.1g / mol) = 2.56g of H₂S
Dry petals of a base x when kept in open absorbs moisture and turns sticky . The compound is also formed by chlor-alkali process . Write the chemical name of x
Answer: Sodium Hydroxide (NaOH)
Explanation: Sodium Hydroxide also known as Cautious Soda is a compound comprising of Sodium cations and Hydroxide anions.
It is white and in form of opaque crystals.
It is anhydrous and completely soluble in water.
It is also a Hygroscopic compound which explains its absorption of water from the air.
Sodium Hydroxide is also formed by a chlor alkali process which is an industrial processes used for the electrolysis of sodium chloride solutions.
This process produces sodium hydroxide and chlorine.
See simple equation below;
2NaCl + H2O ---> 2NaOH + Cl2
In an electron dot diagram what is the maximum number of dot surrounding a symbol. A. 8 B.4 C. 2 D.10
Answer:
A. 8
Explanation:
8 valence electrons means you have a full shell.
3) List two other names for P-waves and for S-waves.
4) How many earthquake recording stations are needed to locate an earthquake
epicenter? What would happen if you only had two stations? Explain and
illustrate the difference.
What mass of hydrogen is produced from the reaction of 50.0 g of Mg and 75.0 g of HCl? How much of the excess reagent is left over?
Mg + 2HCl → MgCl2 + H2
What is the name for a nuclear particle that has about the same mass as a neutron, but with a positive charge?
nuclide
proton
electron
isotope.
proton is the name for a nuclear particle that has about the same mass as a neutron, but with a positive charge.
If I were to draw an electron configuration for a bromine (Br) atom, what is the highest energy level I would reach?
3s
3p
4s
4p
Answer:
4p
Explanation:
3s < 3p < 4s < 4p
This arrangement is in order of increasing energy.
This explains that, 4p is the highest energy level you can reach.
Which element would you expect to behave the most like carbon (C)?
O A. Germanium (Ge)
O B. Phosphorus (P)
O C. Nitrogen (N)
O D. Oxygen (0)
Which element would you expect to behave the most like carbon ( C ) ?
● A. Germanium (Ge) ✔
O B. Phosphorus (P)
O C. Nitrogen (N)
O D. Oxygen (0)
The statement for the element would expect to behave the most like carbon (C) is "Germanium (Ge)."
What is an element?An element is a substance that cannot be divided into smaller components through normal chemical processes. All matter is composed of elements, which are the basic building blocks.
Carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), and flerovium (F) are the six chemical elements that make up Group 14 (IVa) of the periodic table (Fl). That is, germanium and carbon belong to the same family.
Therefore, Germanium (Ge) element expect to behave the most like carbon (C).
Hence the correct answer is A.
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A student caries out an experiment and dissolves 10.0 g of sodium bromide. NaBr, in 200g of water. What is the molality of the solution?
Answer:
0.485mol/kg
Explanation:
Molality is defined as the ratio of the number of moles of a solute to the kilogram of a solvent which is usually water.
Mass of NaBr = 10g
Molar mass of NaBr= 23+80=103g/mol
Mole of NaBr = mass / molar mass=10g/103g/mol= 0.097mol
Molality= Mole of a solute/ mass of solvent in kg
Mole of a solute( NaBr)= 0.097mol; mass of solvent( water in kg)= 200g. To convert to kg: 200g/1000g= 0.2kg
Molality = 0.097mol/0.2kg = 0.485mol/kg
A 13.5g sample of gold is heated, then placed in a calorimeter containing 60g of water. The temperature of water increases from 19oC to 20oC. The specific heat of gold is 0.13J/goC. What was the initial temperature of the gold metal sample?
Answer:
[tex]T_i~=163.1[/tex] ºC
Explanation:
We have to start with the variables of the problem:
Mass of water = 60 g
Mass of gold = 13.5 g
Initial temperature of water= 19 ºC
Final temperature of water= 20 ºC
Initial temperature of gold= Unknow
Final temperature of gold= 20 ºC
Specific heat of gold = 0.13J/gºC
Specific heat of water = 4.186 J/g°C
Now if we remember the heat equation:
[tex]Q_H_2_O=m_H_2_O*Cp_H_2_O*deltaT[/tex]
[tex]Q_A_u=m_A_u*Cp_A_u*deltaT[/tex]
We can relate these equations if we take into account that all heat of gold is transfer to the water, so:
[tex]m_H_2_O*Cp_H_2_O*deltaT=~-~m_A_u*Cp_A_u*deltaT[/tex]
Now we can put the values into the equation:
[tex]60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C=-(13.5~g*0.13~J/g{\circ}C*(20-T_i)~{\circ}C)[/tex]
Now we can solve for the initial temperature of gold, so:
[tex]T_i~=(\frac{60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C}{13.5~g*0.13~J/g{\circ}C})+20[/tex]
[tex]T_i~=163.1[/tex] ºC
I hope it helps!
Taking into account the definition of calorimetry, the initial temperature of the gold metal sample is 163.36 °C.
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
For gold:Mass of gold = 13.5 gInitial temperature of gold= Unknown Final temperature of gold= 20 ºC Specific heat of gold = 0.13 [tex]\frac{J}{gC}[/tex]For water:Mass of water = 60 g Initial temperature of water= 19 ºC Final temperature of water= 20 ºC Specific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
For gold: Qgold= 0.13 [tex]\frac{J}{gC}[/tex]× 13.5 g× (20 C - Initial temperature of gold)
For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× 60 g× (20 C - 19 C)
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qgold = + Qwater
- 0.13 [tex]\frac{J}{gC}[/tex]× 13.5 g× (20 C - Initial temperature of gold)= 4.186 [tex]\frac{J}{gC}[/tex]× 60 g× (20 C - 19 C)
Solving:
- 1.755 [tex]\frac{J}{C}[/tex]× (20 C - Initial temperature of gold)= 251.16 J
- 1.755 [tex]\frac{J}{C}[/tex]× 20 C - (- 1.755 [tex]\frac{J}{C}[/tex])× Initial temperature of gold= 251.16 J
- 35.1 J +1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold= 251.16 J
1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold= 251.16 J + 35.1 J
1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold=286.7 J
Initial temperature of gold=286.7 J÷ 1.755 [tex]\frac{J}{C}[/tex]
Initial temperature of gold= 163.36 °C
Finally, the initial temperature of the gold metal sample is 163.36 °C.
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