Answer:
KBr
Explanation:
A metal has a very high melting point. Aluminum is a metal.
Ionic solids do not conduct electricity in the solid state. However, when the solids are melted, they conduct electricity.
KBr is an ionic substance, it can only conduct electricity in molten form because the ions are locked up in the solid.
5. When an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of -183°C and the other has a boiling point of -253ºC. Was this event a physical
change or a chemical change?
It was a chemical change.
It was both a chemical and physical change
It was a physical change
It could have been either a physical or chemical change.
Answer:
Change is happening all around us all of the time. Just as chemists have classified elements and compounds, they have also classified types of changes. Changes are classified as either physical or chemical changes. Chemists learn a lot about the nature of matter by studying the changes that matter can undergo. Chemists make a distinction between two different types of changes that they study—physical changes and chemical changes.
HELP ASAP!
Which data value is most likely to be an error in the data shown?
A. The .64 in trial 2
B. The 6.4 in trial 1
O C. The 1.7 in trial 1
D. The 6.3 in trial 3
Answer:
0.64 in trial 2
Explanation:
6- A favorable condition for two elements to form an ionic bond is?
a- both should be electronegative
b- one should have low electron affinity and the other low ionization energy.
C- one should have high electron affinity and the other low ionization energy.
d- both should be highly electronegative
Answer: C- one should have high electron affinity and the other low ionization energy.
Explanation:
Ionization energy is the energy required to remove the electron from an isolated gaseous atom.
Electron affinity is the tendency of an isolated atom to attrcat the electrons towards itsellf.
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and it can donate electron easily if it has low ionization energy.
The element which accepts the electrons is known as electronegative element or non metal and it can easily accept the electron if it has high electron affinity.
How far in advance is weather forecasting most accurate?
one week
one month
multiple years
multiple months
Answer:
One week.
Explanation:
I would think one month because on weather websites you can see a month of weather. But the closer the day your looking at the prediction will be more accurate.
The most accurate range of data for weather forecasting is: A. one week.
What is weather?Weather can be defined as the average atmospheric conditions of a particular area (region) over a short period of time.
The elements of weather.Some examples of the elements of weather include the following:
PrecipitationAtmospheric pressureRelative humidityWind speedTemperatureIn meteorology, the most common forecasted element of weather is temperature (degree of hotness or coldness) and it usually done a weekly basis such as one week.
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draw for all constitutional isomers that have molecular formula C2H6O2
Answer:
Explanation:
Two or more compounds are said to be isomers if they have the same molecular formula but different structures.
Isomers that have the same molecular formula but different connectivity are largely regarded as constitutional isomers.
From below, we can see the different constitutional isomers of C2H6O2.
(a)
[tex]\mathbf{CH_3 - O - O - CH_3}[/tex]
(b)
CH₃ - CH₂ - O - O - H
(c)
[tex]OH\ \ \ \ \ \ \ \ \ \ \ OH[/tex]
| |
CH₂ -- CH₂
(d)
OH
|
CH₃ -- CH
|
OH
(e)
[tex]\mathbf{CH_3- O - CH_2-OH}[/tex]
Explain the difference between atom and element
Answer:
an atom is the smallest part of an element that has the properties of that element
it can't be broken further into smaller substances
an element is the simplest chemical
it consists of one type of atoms
so you can consider atoms as the building block of an element
What are the coefficients that would correctly balanced reaction
Answer: As a consequence, chemical equations must be balanced, meaning that the number and kinds of atoms must be the same on both sides of the reaction arrow. The numbers placed in front of formulas to balance equations are called coefficients, and they multiply all the atoms in a formula.
Will mark brainliest!!!! 15 pts!!!!Please solve these equations
please complete work
Calculate the molar mass of ammonium salfate:(NH4)2SO4
Answer:
132.14 g/mol
Explanation:
Which of the following would be the best thing to do to reverse the impact humans have had on the enviroment?
A. Change the way we approch science
B. Stop growing as a population
C. Change our resource use habits
D. Stop using technology
Which one is the right one? think 40 points for answer : )
Answer:
I think its C
Explanation:
but don't trust me 2 much
The environment provides a vast array of materials and services that people use to live. Often these resources have competing uses and values. In order to conserve environment change our resource use habits. The correct option is C.
What are environmental resources?An environmental resource is any material, service, or information from the environment that is valuable to society. This can refer to anything that people find useful in their environs, or surroundings. Food from plants and animals, wood for cooking, heating, and building, metals, coal , and oil are all environmental resources.
Clean land, air, and water are environmental resources, as are the abilities of land, air, and water to absorb society's waste products. Heat from the sun, transportation and recreation in lakes, rivers, and oceans, a beautiful view, or the discovery of a new species are all environmental resources.
Thus the correct option is C.
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What is the volume of which 0.25 mole of a gas occupied at 0.5 atm and 50°C ?
The volume of the gas : V = 13.243 L
Further explanationGiven
n = 0.25 mole
P = 0.5 atm
T = 50 + 273 = 323 K
Required
The volume
Solution
Ideal gas law
PV=nRT
R = gas constant = 0.082 L.atm/mol K
V = nRT/P
Input the value :
V=0.25 x 0.082 x 323 / 0.5
V = 13.243 L
Arrange the compounds below in decreasing order of the ionic character of the bonds in them.
a. CsF
b. OF2
c. SrF2
d. F2
Answer: [tex]CsF[/tex] > [tex]SrF_2[/tex] > [tex]OF_2[/tex] > [tex]F_2[/tex]
Explanation:
The percent ionic character is used to determine if a bond is more ionic or covalent. More is the percent ionic character, the more ionic the molecule is. If the electronegativity difference between two elements is higher than 1.7 it will be considered as ionic.
The electronegativity difference for CsF is (3.98-0.79) = 3.19
The electronegativity difference for [tex]OF_2[/tex] is = (3.98-3.44) = 0.54
The electronegativity difference for [tex]SrF_2[/tex] is (3.98-0.95) = 3.0
The electronegativity difference for [tex]F_2[/tex] is 0.
Thus decreasing order of ionic character of the bonds is CsF > [tex]SrF_2[/tex] > [tex]OF_2[/tex] > [tex]F_2[/tex]
HELPPP PLEASE
Calculate the mass of beryllium (Be) needed to completely react with 18.9 g nitrogen gas (N2) to produce Bez N2, which is the only product of the reaction.
A. 6.19
B. 12.29
C. 18.29
D. 36.69
Answer:
Mass = 18.29 g
Explanation:
Given data:
Mass of beryllium needed = ?
Mass of nitrogen = 18.9 g
Solution:
Chemical equation:
3Be + N₂ → Be₃N₂
Number of moles of nitrogen:
Number of moles = mass/molar mass
Molar mass of nitrogen = 28 g/mol
Number of moles = 18.9 g/ 28 g/mol
Number of moles = 0.675 mol
Now we will compare the moles of nitrogen and Be.
N₂ : Be
1 : 3
0.675 : 3/1×0.675 = 2.03 mol
Mass of Be:
Mass = number of moles × molar mass
Mass = 2.03 mol × 9.01 g/mol
Mass = 18.29 g
An alkene reacts with a strong protic acid to form a carbocation. In Part 1 draw the curved arrow notation for the reaction between an alkene and HBr. However, an alkene will react with a halogen electrophile to form a cyclic intermediate. In Part 2 draw the curved arrow notation for the reaction between an alkene and Br2.
Answer:
See explanation and image attached
Explanation:
Now, we have chosen the alkene 1-propene in our example.
In the first reaction of 1-propene with HBr, the reaction proceeds by ionic mechanism leading to the formation of 2-bromo propane.
In the second reaction of 1-propene with the bromine molecule, the first step is the formation of the brominium cation which is a cyclic intermidiate followed by the addition of Br^- yielding the 1,2- dibromopropane product
If the density of a certain oil is 0.8gcm3. What is the mass of 10 cm3 sample of this oil?
report your answer with one significant figure.
Taking into account the definition of density, the mass of the sample of oil with a volume of 10 cm³ and a density of 0.8 [tex]\frac{g}{cm^{3} }[/tex] is 8 grams.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Mass of the sample of oilIn this case, you know that:
Density= 0.8 [tex]\frac{g}{cm^{3} }[/tex]Volume= 10 cm³Replacing in the definition of density:
[tex]0.8 \frac{g}{cm^{3} } =\frac{mass}{10 cm^{3} }[/tex]
Solving:
mass= 0.8 [tex]\frac{g}{cm^{3} }[/tex] × 10 cm³
mass= 8 g
In summary, the mass of the sample of oil with a volume of 10 cm³ and a density of 0.8 [tex]\frac{g}{cm^{3} }[/tex] is 8 grams.
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If the wavelength of red light is 650 x 10^-9 meters (or 6.50x10^-7m) and the speed of light (c) is 3.00 x 10^8 m/s , what is its frequency in Hz?(1/sec = Hz) , and c = (wavelength x frequency)
Answer:
f = 4.6 × 10¹⁴ Hz
Explanation:
Given data:
Wavelength of light = 6.50x10^-7m
Speed of light = 3.00 x 10^8 m/s
Frequency of light = ?
Solution:
Formula:
Speed of radiation = frequency × wavelength
by putting values,
3×10⁸ m/s = f × 6.50x10^-7m
f = 3×10⁸ m/s / 6.50x10^-7m
f = 0.46 × 10¹⁵ s⁻¹
f = 0.46 × 10¹⁵ Hz
f = 4.6 × 10¹⁴ Hz
The density of aluminum is 2.70 g/cm^3. A square piece of aluminum foil, 22.86 cm on a side is found to weigh 2.568 g. What is the thickness of the foil, in millimeters?
Answer:
0.00182 cm
Explanation:
Area of the aluminum foil = 22.86 cm ×22.86 cm = 522.58 cm^2
Density = mass/area × thickness
Density × area × thickness = mass
Thickness = mass/ Density × area
Thickness = 2.568 g/2.70 g/cm^3 × 522.58 cm^2
Thickness= 0.00182 cm
Need help asap!
1. Given that the electronegativity of sulfur (S) is 2.5 and that of silicon (Si) is 1.8, which of the following best describes the chemical bonding in silicon monosulfide (SiS)?
A. ionic: transfer of electrons from silicon to sulfur
B. nonpolar covalent: equal sharing of electrons between silicon and sulfur
C. polar covalent: electrons shared between silicon and sulfur but attracted more to the sulfur
D. polar covalent: electrons shared between silicon and sulfur but attracted more to the silicon
2. Which of the following is a molecular compound?
A. Mg3N2
B. NH3
C. AlCl3
D. LiBr
3. Potassium (K) reacts with a certain nonmetallic element (Z) to form a compound with the general formula KZ; where element Z is a diatomic gas at room temperature. What is element Z?
A. Oxygen
B. Fluorine
C. Nitrogen
D. Hydrogen
Answer: 1. C. polar covalent: electrons shared between silicon and sulfur but attracted more to the sulfur
2. B) [tex]NH_3[/tex]
3. B) Fluorine
Explanation:
1. A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms.
Electronegativity difference = electronegativity of sulphur- electronegativity of silicon = 2.5 -1.8 = 0.7
Thus as electronegativity difference is less than 1.7 , the cond is polar covalent and as electronegativity of sulphur is more , the electrons will be more towards sulphur.
2. A molecular compound is usually composed of two or more nonmetal elements. Example: [tex]NH_3[/tex]
Ionic compound is formed by the transfer of electrons from metals to non metals. Example: [tex]Mg_3N_2[/tex] , [tex]AlCl_3[/tex] and [tex]LiBr[/tex]
3. For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here K is having an oxidation state of +1 and as the compound formed is KZ, the oxidation state of non metallic element Z should be -1. Thus the element Z is flourine which exists as diatomic gas [tex]F_2[/tex]
If you have moles and want to convert to liters, which conversion factor would you use
Answer:
When converting from liters to moles or moles to liters, you will use the equality 1 mole=22.4 L for a gas at STP.
If you have moles and want to convert to (Volume) liters, 1 mole = 22.4 L is the conversion factor that can be used.
The area that any three-dimensional solid occupies is known as its volume. These solids can take the form of a cube, cuboid, cone, cylinder, or sphere. Various forms have various volumes. We have studied the several solids and forms that are specified in three dimensions, such as cubes, cuboids, cylinders, cones, etc., in 3D geometry. We will discover how we can determine the volume for each of these shapes. One mole of any gas have 22.4 L at STP.
1 mole = 22.4 L
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(2)
3.
How would you calculate the change in entropy when the pressure of a perfect gas is
changed isothermally from P; to Pr
How would you calculate the change in entropy when the pressure of a perfect gas is changed isothermally from P_i to P_f
Answer:
ΔS = nRIn(P_i/P_f)
Explanation:
Formula for entropy change is;
ΔS = nC_p•In(T_f/T_i) + nRIn(P_i/P_f)
Since the pressure of the perfect gas is changed isothermally, it means that temperature remains the same and as such T_f = T_i
Thus, we now have;
ΔS = nC_p•In(1) + nRIn(P_i/P_f)
In(1) = 0
Thus;
ΔS = nRIn(P_i/P_f)
At what temperature a gas with volume 175 L at 15 oC and 760mmHg will occupy a volume of 198 L at a pressure 640mmHg?
Answer:
To calculate the pressure when temperature and volume has changed, we use the equation given by combined gas law. The equation follows:
\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}
T
1
P
1
V
1
=
T
2
P
2
V
2
where,
P_1,V_1\text{ and }T_1P
1
,V
1
and T
1
are the initial pressure, volume and temperature of the gas
P_2,V_2\text{ and }T_2P
2
,V
2
and T
2
are the final pressure, volume and temperature of the gas
We are given:
\begin{gathered}P_1=760mmHg\\V_1=175L\\T_1=15^oC=[15+273]K=288K\\P_2=640mmHg\\V_2=198L\\T_2=?K\end{gathered}
P
1
=760mmHg
V
1
=175L
T
1
=15
o
C=[15+273]K=288K
P
2
=640mmHg
V
2
=198L
T
2
=?K
Putting values in above equation, we get:
\begin{gathered}\frac{760mmHg\times 175L}{288K}=\frac{640mmHg\times 198L}{T_2}\\\\T_2=274K\end{gathered}
288K
760mmHg×175L
=
T
2
640mmHg×198L
T
2
=274K
Hence, the temperature when the volume and pressure has changed is 274 K
Homogeneous mixtures have components that are unevenly spaced throughout true or false
Answer:
False
Explanation:
Mixtures are impure substances.
There are two types of mixtures based on the number of coexisting phases.
Homogeneous mixtures have their constituents existing in one single phase. The components are evenly spaced.
Heterogeneous mixtures have their constituents existing in at least two different phases. Therefore, they are unevenly spaced due to the phases present within the mixture.
Think of 6 to 10 questions that ask participants how they keep (or kept) their
homes or businesses warm in cold weather and cool in hot weather. Your
questions may ask about the types of devices used, the sources of energy
used to run the devices, the effectiveness of the methods used, or effects on
the environment. worth 100 points!!
Answer:
One could be What kind of insulator do you use in the winter?
Explanation:
A student sets up the following equation to convert a measurement.
(The ? stands for a number the student is
going to calculate.)
Fill in the missing part of this equation.
Note: your answer should be in the form of one or more fractions multiplied together.
gcm
3 kg.m
-2.9 x 10
0x0
.
X Х
5
Answer:
9 . this was not able the first one. it has to go on, I will not sure about
Which of the following is not a natural
way water is stored in the water cycle?
A Stream
B. Pond
C. Iceberg
D. Cup
Answer:
cup...................
In which phase of cellular respiration is oxygen a substrate ?
Answer:
electron transport 11 is the correct answer
help asap pleaseeeeeee
Thermodynamics and Q
How much energy is needed to heat 40.5g of water from 15.6°C to 73.0°C
Answer:
9717.246 J
Explanation:
From the question given above, the following data were obtained:
Mass (m) of water = 40.5 g
Initial temperature (T₁) = 15.6 °C
Final temperature (T₂) = 73 °C
Specific heat capacity (C) of water = 4.18 J/gºC
Heat (Q) =.?
Next, we shall determine the change in the temperature of water. This can be obtained as follow:
Initial temperature (T₁) = 15.6 °C
Final temperature (T₂) = 73 °C
Change in temperature (ΔT) =?
ΔT = T₂ – T₁
ΔT = 73 – 15.6
ΔT = 57.4 °C
Finally, we shall determine the heat energy required. This can be obtained as follow:
Mass (m) of water = 40.5 g
Specific heat capacity (C) of water = 4.18 J/gºC
Change in temperature (ΔT) = 57.4 °C
Heat (Q) =.?
Q = MCΔT
Q = 40.5 × 4.18 × 57.4
Q = 9717.246 J
Thus, the heat energy required is 9717.246 J
Which of the following is an example of chemical weathering?
plant roots splitting rocks
acid dissolving limestone
water breaking rocks
wind breaking down rock
Answer:
Estoy deprimido y odio la vida. Así que sí
The specific heat capacity of methane gas is 2.20 J/g-K. How many joules of heat are needed to raise the
temperature of 5.00 g of methane from LaTeX: 36.0^\circ C36.0 ∘ C to LaTeX: 75.0^\circ C75.0 ∘ C?
Heat needed to raise the temperature : Q = 3432 J
Further explanationGiven
c = The specific heat capacity = 2.20 J/g-K
m = mass = 5 g
Δt = Temperature difference = 75-36 =39 °C=312 K
Required
Heat needed
Solution
Heat can be formulated
Q = m.c.Δt
Input the values :
Q = 5 g x 2.2 J/g-K x 312 K
Q = 3432 J