Answer: 2 and 3
Explanation:II and III
Which of the following best describes Avogadro's number?*
A) An equation that can be used to calculate how many atoms are in one mole of
anything
B) A variable that represents the value of the atomic mass relative to one mole of an
element
C) A constant that states how many atoms/molecules are in one mole of anything
D)An expression in scientific notation that represents the average atomic mass of an
element
Answer:
C) A constant that states how many atoms/molecules are in one mole of anything
Explanation:
Avogadro's number like the name suggests is a constant that states how many atoms/molecules are in one mole of anything.
What does a bi-directional arrow tell you about a chemical reaction?
in tsotsi who is petah
Answer: Petah is the leader of the gang. They take him in, feed him, and allow him to sleep in the pipes by the river ith them. As he learns to fend for himself he leaves the pain of the past behind even ridding himself of his forer name, deeming himself Tsotsi-gangster.
Explanation:
a mixture is separated using the apparatus shown
what is the mixture
A aqueous copper chloride and copper
B aqueous copper chloride and sodium chloride
C ethane and methane
D ethanol and water
Predict the total pressure in Container C if the initial pressure in
Container A was tripled and Container B was reduced by one-third then
mixed together in Container C.
SHOW ALL WORK
Answer:
[tex]98 \times x6x \geqslant {36461 { {3 \frac{ \sqrt[ |?| ]{?} }{?} }^{2} }^{?} }^{2} [/tex]
okay
Which of the following is NOT an advantage that can only be gained by the use of digital data transmission instead of analog transmission?
A. Has less static
B. Carries more information
C. Takes up less bandwidth
D. Provides higher resolution images
Answer:
D. Provides higher resolution images
Explanation:
The advantages gained by the use of digital data transmission instead of analog transmission are;
1) Noise do not damage digital signal transmission but they impact on analog signals. Digital signals are therefore more secure than analog signals
2) The bandwidth required for digital signal transmission is much less than the bandwidth required for analog
3) Digital signal allow data transmission to very long distance
4) The rate of transmission with digital signals is higher with digital signals
5) Digital signals allow easy and cost effective methods by which they are replicated
The resolution of an image is a measure of the amount of pixels displayed per inch of the image, such that a high resolution image has more pixel per inch of the image. It is therefore a factor determined at the source of the image based on how much detail is required in an image before transmission
A scientist plans the react 9.0x10^-2 L NO held at a pressure of 200.0kPa and a temperature of 20.0 C with excess hydrogen. How many moles of nitrogen gas will be produced
Answer:
[tex]n_{N_2}=0.00369molN_2[/tex]
Explanation:
Hello there!
In this case, by firstly setting up the described chemical reaction, we are able to write:
[tex]2NO(g)+2H_2(g)\rightarrow N_2(g)+2H_2O(g)[/tex]
Thus, given the pressure (convert to atm), volume and temperature (convert to K) we can calculate the moles of NO:
[tex]n=\frac{PV}{RT}\\\\n=\frac{200.00/101.325atm*0.090L}{0.08206\frac{atm*L}{mol*K}*(20.0+273.15)K} \\\\n=0.00738molNO[/tex]
Next, we use the 2:1 mole ratio of NO to N2 to obtain the moles of nitrogen gas that will be produced:
[tex]n_{N_2}=0.00738molNO *\frac{1molN_2}{2molNO} \\\\n_{N_2}=0.00369molN_2[/tex]
Regards!
(2-2) Looking at the chemical formula CaF2 (calcium fluoride), what do you think this substance is made of? (Choose ALL that apply
Metal
Metalloid
Non-metal
Answer:
Metal
Non-metal
Explanation:
Ionic compounds are said to be formed when metals donate electrons to non metals.
The metals become positively charged while the nonmetals become negatively charged.
CaF2 is composed of Ca^2+ and F^-. Calcium is a metal of group 2 in the periodic table while F is a nonmetal of group 17 in the periodic table.
Hence CaF2 is composed of a metal and a nonmetal.
Balance the equation !!!
Answer:
https://www.webqc.org/balance.php
Explanation:
this is the website i used to balance all my chem equations
i promise its not a scam its a legit website lol it works rly well
What reacts with the hydrocarbon fuel in a combustion reaction? small words, please
Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.
#small words#Why study science?
Lmk ASAP
Write a chemical equation for the following reaction. (Type your answer using format CH4 for CH4.) In water, iron(III) chloride reacts with sodium hydroxide, producing solid iron(III) hydroxide and sodium chloride.
Answer:
FeCl3(aq) -
3NaOH(aq) 0 Fe(OH)3(s) -
3NaCl(aq)
Explanation:
FeCl3(aq) -
3NaOH(aq) 0 Fe(OH)3(s) -
3NaCl(aq)
The volume of gas in a balloon is 1.90L at 21.0°C.The balloon is heated, causing it to expand to a volume of 5.70L. what is the new temperature of the gas inside the balloon?
Answer: The new temperature is [tex]63^{o}C[/tex].
Explanation:
Given: [tex]V_{1}[/tex] = 1.90 L, [tex]T_{1} = 21.0^{o}C[/tex]
[tex]V_{2}[/tex] = 5.70 L, [tex]T_{2} = ?\\[/tex]
Formula used to calculate new temperature is as follows.
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{1.90 L}{21.0^{o}C} = \frac{5.70 L}{T_{2}}\\T_{2} = 63^{o}C[/tex]
Thus, we can conclude that the new temperature is [tex]63^{o}C[/tex].
28. Which of the following reactions at equilibrium would NOT be affected by volume
changes at constant temperature?
a. 2 CO(g) + O2(e) < > 2 CO2(g)
b. 2 NO2(g) → N2048)
c. 2 NO(g) + 3 F2(g) → 2 F3NO(e)
d. O3(e) + NO(g) + > NOzle) +
e. None of the above.
Ozig)
Answer:
Explanation:
is the
How many elements in a periodic table?
Balance the equation
H2C2O2 + KOH——>K2C2O4 + H2O
Answer:
H2C2O2 + 2KOH ----- K2C2O4 + 2H2O
When using a calorimeter, the initial temperature of a metal is 70.4C. The initial temperature of the water is 23.6C. At the end of the experiment, the final equilibrium temperature of the water is 29.8C.
Answer:
temperature of a metal is29.8
temp. of water is 6.2
temp. change of metal -40.6
Explanation:
10 ejemplos de disoluciones identificando el soluto y el solvente y el tipo de disolucion que corresponde
Answer:
iqjapsgvöaöqpwüsbwjwj
A block of aluminum weighing 200 g is cooled from 100C to 50°C with the release of 1080 joules of heat. From this data, calculate the specific heat of aluminum.
Answer:
0.108
Explanation:
You use the formula Q =mco
M is mass
Q is th heat release
C is specific heat
O is the temperature change
Substitute what you have and what you get in the information in the equation then you will get your answers
An electric current is produced when ______________________ move continuously batteries magnets electric charges wires
Answer:
electric charges.
Explanation:
Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction.
An electron can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
An electric current is produced when electric charges (electrons) move continuously and it's measured in Amperes through the use of an ammeter.
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = IR[/tex]
Where;
V represents voltage measured in voltage.
I represents current measured in amperes.
R represents resistance measured in ohms.
PLEASE ANSWER I GIVE BRAINLIEST AND MAX POINTS
Answer:
I believe the answer is A (changes in air temperature result in differences in air pressure which causes wind). Hope this helps
Explanation:
Is this an alpha or beta decay?
how many moles are in 29.8grams of CaCl2?
Answer:
110.984 ?
i apologize if i'm wrong, you can report it if im wrong
have a good day/ night
Explanation:
PlEASE HELP ME QUICK PLEASE!!!
Answer:
first is c and second is a
The Center for Disease Control publishes articles explaining the causes of seasonal West Nile virus. Research proves mosquitoes in freshwater ecosystems spread the disease to humans and other organisms. How do mosquitoes transmit the West Nile virus to other organisms? Question 9 options: Mosquitoes transmit the virus as parasites which feed on the blood of host organisms and inject the virus during feeding. Mosquitoes transmit the virus as hosts who feed on the blood of organisms and inject the virus during feeding. Mosquitoes transmit the virus when they land on the skin of an organism. Mosquitoes transmit the virus by preying on organisms and spreading the virus on contact.
Answer:
The correct answer is - Mosquitoes transmit the virus as parasites which feed on the blood of host organisms and inject the virus during feeding.
Explanation:
According to the CDC, the seasonal West Nile virus is caused by the mosquitoes of freshwater transmit this disease to humans and others. These mosquitoes are feed on the birds and pick these viruses.
These viruses stick on mosquitoes and when they feed on the blood of humans they transmit these viruses by injecting viruses into the blood of humans.
if a half life is 2.5 hours, how long is 2 half life's
Answer:
Im not really sure what a half life is, but two of them would be 5.0 hours
Answer:
5 hours
Explanation:
cause if half life is 2.5hours we just multiply it by two and get 5 hours
A sample of chlorine gas is stored at a temperature of -25oC. If the chlorine gas's temperature is raised to 52oC, its volume increases to 2.60 L. What is the initial volume of the gas?
Answer:
whats ur answer options
Explanation:
...
its b
How many grams of magnesium are in sample containing 9.12+ 10 ^23atoms
Answer: There are 1.51 moles present in [tex]9.12 \times 10^{23}[/tex] atoms.
Explanation:
According to the mole concept, there are [tex]6.022 \times 10^{23}[/tex] atoms present in one mole of every substance.
Hence, moles present in [tex]9.12 \times 10^{23}[/tex] atoms are calculated as follows.
[tex]Moles = \frac{9.12 \times 10^{23}}{6.022 \times 10^{23}}\\= 1.51 mol[/tex]
Thus, we can conclude that there are 1.51 moles present in [tex]9.12 \times 10^{23}[/tex] atoms.
does neutrons have a orbit outside the atom
Answer:
No because it's located inside the nucleus of the atom
hope this helps
have a good day :)
Explanation:
2. How many atoms of each element does a mole of Aspartame contain?
Answer:
The molecular formula for aspartame is C14H18N2O5, and its molar mass is about 294 g/mol. 1.2 g / 294 g/mol = 4.08 X 10-3 moles aspartame. Since each mole of aspartame has 2 moles of nitrogen, you have 8.16 X 10-3 moles of N in your 1.2 grams of aspartame.
Explanation: