Answer:
1. Molecular solids are usually excellent conductors of electric current.
Explanation:
Molecular solids are actually insulators (prevent electricity).
How many liters of 4.000 M sodium bromide solution are needed to
make 0.250 L of 0.200 M sodium bromide?
What mass of H₂ is required to produce 2 moles of NH3?
Answer: RATIOS IN TERMS OF MOLES
Solution: Solution According to the balanced equation, 2 moles of NH3 are produced when 3 moles of H2 react.
Below is a symbol block from the periodic table. What does the number 6 indicate?
Answer:
Carbon And the number of protons
Okay which is the answer
Answer:
KOH
Explanation:
When ionic compounds (a metal and a nonmetal) dissolve, they are good conductors of electricity, and would result in the brightest light. Weak bases and covalent compounds do not dissolve, so KOH, a strong base and ionic compound, would dissolve and conduct electricity.
Meaning of metamerism and give an example
Answer:
In colorimetry, metamerism is a perceived matching of colors with different (nonmatching) spectral power distributions. Colors that match this way are called metamers.
Explanation:
In colorimetry, metamerism is a perceived matching of colors with different (nonmatching) spectral power distributions. Colors that match this way are called metamers.
examples
diethyl ether and methyl propyl ethers are metamers.
What is the change in temperature of 150 grams of water when gains 500 Joules of energy?. The Cp for
water is 4.18 J/gxC
The change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C
What is Heat Transfer ?Heat transfer is defined as the process in which the molecules are moved from the region of higher temperature to lower temperature.
The heat transfer can be calculated by the formula
[tex]Q=m \times c \times \Delta T[/tex]
Here, Q is the heat supplied to the system,
m is the mass of the system,
c is the specific heat capacity of the system and
Δ T is the change in temperature of the system.
Substituting the values in the equation
m = 150g
Q=500 Joules
[tex]\rm c_{p}[/tex] = 4.18 J/gxC
500 = 150 * 4.18* Δ T
Δ T = 0.797 °C
Therefore the change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C .
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Calculate the volume of 450g of gold (density=19.3 g/cm^3)
use dimensional analysis and set up your equation like so:
[tex]450g\ x\ \frac{cm^3}{19.3g}[/tex]
if you do the calculations, the 'g' should cancel out which leaves you with the unit 'cm³'
[tex]cm^3=\frac{450g}{19.3g}[/tex]
[tex]cm^3=23.31606218...[/tex]
= 23.3 cm³
[tex]\text{Density,}~ \\\\~~~~~~~\rho = \dfrac{m}{V}\\\\\implies V = \dfrac{m}{\rho}\\\\~~~~~~~~~~=\dfrac{450 ~g}{19.3 ~ g~cm^{-3}}\\\\~~~~~~~~~~=23.3~ cm^3\\\\\text{Hence, the volume of 450g gold is }~23.3 ~cm^3.[/tex]
PLEASE HURRY What is one technology that has contributed to human population growth in the past that could hinder it in the future? How will this happen?
Answer:
Factories because they have helped with producing goods faster but in the meanwhile, our future will slowly get warmer.
Explanation:
Why are prefixes often added to si units
Answer:
b
Explanation:
b
3. How many grams are there in 5.5 mole of Sulfur [S=32].
Answer:
176g
Explanation:
Given :
moles = 5.5
molar mass (sulfur ) = 32u
given mass = ?
Solution:
mole = given mass/molar mass
5.5 = given mass/ 32
5.5×32=given mass
176 g = given mass
A chemist prepares a standard solution in the lab using a 500.0 mL volumetric flask. 4.865 g of NaCl is used. What is the molarity of the NaCl solution?
[tex]\huge \underbrace \mathfrak{Answer}[/tex]
0.17 mol/l
Explanation:
⠀
⠀
⠀⠀⠀⠀▨ Note⠀
What is molarity?Molarity is the amount of moles of component present in certain volume of solution.
⠀
What is mole?Mole is a unit in chemistry i.e. 6.022×10²³ ions, atoms or molecules present in the substance.
⠀
⠀
⠀⠀⠀⠀● Solution⠀
Weight of NaCl(m) = 4.865 grams
Volume(V) = 500ml = 0.5 liters
⠀
1 mole of NaCl = 58g
So 4.865g of NaCl(n)
[tex] = \sf \frac{4.865}{58} = 0.084 \: moles[/tex]
⠀
While
[tex] \frak{molarity = \frac{no \: of \: moles}{volume} } [/tex]
⠀
Substituting the required values
⠀
[tex] \sf \implies molarity = \frac{n}{V} \\ \\ \sf \implies molarity = \frac{0.084}{0.5} \\ \\ \ \boxed{ \tt{ \implies molarity = 0.17 \: mol \: {l}^{ - 1} }}[/tex]
Using the periodic table, which of the elements below would be a poor conductor of electricity, be a gas, and may have a color?
a. Zinc
b. Cobalt
c. Chlorine
d. Calcium
What is an average? What is the formula to calculate an average? science
Answer:
A average is a number expressing the central or typical value in a set of data. add up all the numbers, then divide by how many numbers there are.
Explanation:
Which has a higher metallic character?
A)Lithium
B)calcium
Please explain your answer
Answer:
Lithium
Explanation:
lithium because metallic character decreases down the group and lithium comes before in group then calcium
Using the chemical formula CaO + 2 NaCl → Na2O + CaCl2, calculate how many moles of CaCl2 you would produce if you used up 5.4 moles of CaO?
Answer:
5.4 moles CaO 1 mole CaCl₂ 5.4 mole CaCl₂
1 mole CaO
Explanation:
Help me out Anyone know these Answers ?
What atoms have the most positive overall charge to least positive
overall charge.
Atom B: 24 protons, 18 electrons
Atom P: 7 protons, 10 electrons
Atom X: 104 protons, 102 electrons
Atom Q: 15 protons, 16 electrons
B2
N
Which form of energy is a type of
potential and kinetic energy?.
a) Mechanical
b) Chemical
c) Electrical
d) Nuclear
Answer:
electrical
Explanation:
because since electricity moves thus giving us kinetic energy and it also stores energy giving is potential energy
05.03: SOUND Energy 9PTS!(9 points)
If objects have a lot of room to vibrate they tend to produce low pitches. If objects can only vibrate a little, they tend to vibrate faster and produce higher pitches. This investigation different an ounce of water effect a glass ability to vibrate observing the pitches it produces.
Question
How does the amount of water in a glass effect the pitch of sound
Hypothesis
complete the hypothesis statement by filling in blank.
If the amount of water in a glass is ________. then the sound pitch will be _______
Variables
What is the test Variable?
__________________________________________________________________
What is the outcome variable?
__________________________________________________________________
What are the constants in this investigation?
__________________________________________________________________
What would you do to ensure that you have a control for this experiment
________________________________________________________________________________________________________________________________________
The pitch of sound increases with decrease in the air volume.
What is the effect of the space on the pitch of sound?The pitch of sound increases with as decrease in the space available for the vibrating particles to vibrate decreases.
In the experiment with water in a glass and the pitch of sound:
If the amount of water in a glass is increases then the sound pitch will be increased.The test variable is the volume of water in th glass cupThe outcome variable is the pitch of soundThe constants are the glass cup and the sound sourceThe control in the experiment can be designed by ensuring that no external sound source is present.Therefore, it was observed that the pitch of sound increases with decrease in the air volume.
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Choose all the right answers.
factors produce changes in Earth's surface? You can choose multiple, giving 60 points
A. Erosion
B. Folding
C. Faulting
D. Weathering
Answer:
The answer is Erosion, Weathering,
Explanation:
These all seem to be correct but i know for a fact those two are correct.
Which choice is not a physical property of matter?
O boiling point
O melting point
O viscosity
O heat of combustion
Answer: The Correct answer is D.) Heat of combustion
Explanation:
Answer:
D
Explanation:
i took the k-12 test
If 5.81 moles of magnesium (Mg) reacts to completion, how many moles of hydrochloric acid (HCI) are need to react with magnesium.
Which of the following ways can be used to measure reaction rate?
a Measure the rate that a reactant is used up
c.a Measure the side reactions
b. Measure the amount that a product is .
d. Estimate the heat given off
formed
Answer:
the answer is b;
the rate of reaction can be found by measuring the amount of product formed in a certain period of time.
Are cable wires made of thermoplastic? If so why?
(This is just a doubt that just came into my head)
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Cable wires are usually made of of thermoplastics because, current passing through the wire has heating effects as well, due to collision of electrons in the conducting wire. so to avoid the melting of normal wire which can break the circuit, Thermoplastics are used, that doesn't have much effect of heat on them.
How many moles are in 843 grams of MgCl2
Answer:
moles = mass / Molar mass
Mass = 843molar mass = 95.211moles -> 843/95.211 = 8.85 mol
How many grams of Copper are in 500grams of Cu2CO3?
Answer:
Explanation:
Calculate the molar mass of Cu2CO3 in grams per mole or search for a chemical formula or substance. Molecular weight of Cu2CO3. ... Copper: Cu: 63.546: 2: 67.927%: Carbon: C: 12.0107: 1: ... it tells us how many grams …
How many grams of rubidium are in 2.39 x 10^24 atoms of rubidium?
Avogadro's number is the number of the particles in a mole of a substance. There are 339 grams of (Rb) rubidium in the sample.
What are atoms?Atoms are the fundamental of the matter that is unsplittable into fine particles.
We know, that 1 mole = 6.022 x 10²³ atoms
So, moles in 2.39 x 10²⁴ atoms will be calculated and converted into mass by using the molar mass of the substance.
2.39 x 10²⁴ × (1 ÷ 6.022 x 10²³) × 85.468 = 339 g Rb
Therefore, 339 g Rb is present in the sample.
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How many grams of rubidium are in 2.39 x 1024 atoms of rubidium?
Answer:
339 grams Rb
Explanation:
To find the final answer, you need to (1) convert atoms to moles (via Avogadro's number) and then (2) convert moles to grams (via molar mass from periodic table).
Molar Mass (Rb) = 85.468 g/mol
2.39 x 10²⁴ atoms Rb 1 mole 85.468 g
------------------------------- x ----------------------------- x -------------------- = 339 g Rb
6.022 x 10²³ atoms 1 mole
Boyle's Law
A container holds 500 mL of CO2 at 20° C and 742 torr. What will be the volume of the CO2 if the pressure is increased to 795 torr?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Convert vol to L
500mL=0.5LApply Boyles law
P1V1=P2V2742(0.5)=795V2371=795V_2V2=0.467LV2=467mL[tex]\large{\underline{\underline{\pmb{\sf{\pink{Ꮧnswer:-}}}}}}[/tex]
P1=742 torrP2=795 torrV1=500mLV2=?T1=20∘C+273=293KT2=20∘C+273=293KP1V1 = P2V2
V2 =P1V1/P2
=(742×500)/(795) = 467mL CO2
Can someone check my answers?
Balance the following chemical equations.
1. __4_ Fe + _3__ O2 → _2__ Fe2O3
2. __2__ C4H10 + __13__ O2 → __8__ CO2 + ___10_ H2O
3. __2__KClO3 → __2__KCl + __3__O2
4. _4___ NH3 + _5___ O2 → _4___ NO2 + _6___ H2O
5. __4__ FeCr2O7 + __8__ K2CO3 + ____ O2 → __2__ Fe2O3 + _8___ K2CrO4 + __8__ CO2
6. Given the reaction P4 + O2 → P2O5
a. Balance the equation
-P4 + 5O2 → 2P2O5
b. How many moles of P2O5 can be produced from 63.1 moles of O2?
-25.24
7. Mole ←→ Mass Conversions
Convert the following number of moles of chemical into its corresponding mass in grams.
a. 0.436 moles of ammonium chloride
-23.323
b. 2.360 moles of lead (II) oxide
-526.750
c. 0.031 moles of aluminium iodide
-12.639
d. 1.077 moles of magnesium phosphate
-283.095
e. 0.50 moles of calcium nitrate
-82.0439
8. Using the following equation:
2 NaOH + H2SO4 → 2 H2O + Na2SO4
How many grams of sodium sulfate will be formed if you start with 200 grams of sodium
hydroxide and you have an excess of sulfuric acid?
-355.25g
9. Using the following equation:
4 NH3 + 5 O2 → 4 NO + 6 H2O
How many moles and how many grams of oxygen (O2) are needed to react with 56.8
grams of ammonia by this reaction?
-4.18 moles or 133.6 grams
10. The catalytic decomposition of hydrogen peroxide is:
____H2O2 (aq) → ____H2O (l) + ____O2 (g)
a. Balance the reaction.
-2H2O2 → 2H2O + O2
b. How many moles of water and oxygen are produced by the decomposition of 86.0
grams of hydrogen peroxide?
-2.5
11. If 154.0 grams of potassium metal reacts with excess water, then how many grams of
potassium hydroxide and hydrogen gas are formed? What volume of hydrogen gas, in liters,
is formed at STP ? Be sure to balance the reaction first.
-__2_K(s) + __2__H2O(l) → __2__KOH(aq) + ____H2(g)
-220.99 grams of potassium hydroxide, 3.97 grams of hydrogen gas, 44.1 liters
12. The burning of solid sulfur in air produces sulfur dioxide gas.
S + O2 → SO2
Balance the reaction. How many moles of sulfur dioxide does the burning of 3 moles of
sulfur form? Calculate the volume of sulfur dioxide produced at STP.
-3 moles of sulfur dioxide, 0.06 l
13. The combustion of a sample of butane, C4H10 (lighter fluid), produced 2.76 grams of water.
2 C4H10 + 19O2 →
The above give the reactants of a combustion reaction.
a. What are the products?
-CO2 + H2O
b. Balance the equation?
-2 C4H10 + 13 O2 = 8 CO2 + 10 H2O
c. If you start with 9.3 grams of C4H10, how much pure O2 is left, if any?
-33.28 g
14. Convert 4084 grams of 3 kept at −40℃ to Liters at STP. The density as a liquid is
681.9kg/3
and 0.769/3
as a gas.
-5.3107 l as a gas, and 0.00598 l as a liquid
15. 3 decomposes into Nitrogen gas and Iodine. If you start with 0.02 grams of 3,
How many moles of Nitrogen are produced at STP?
-0.00002
Answer:
yea they look good. From what I can tell everything is correct.
Explanation:
