Answer:
Every 15 degrees is an hour
Explanation:
What is the time difference in mean solar time between 30° N 75° W and 30° N 90° W?
The radioisotope radon-222 has a half-life of 3.8 days. How much of a 73.9-g sample of radon- (3 222 would be left after approximately 23 days?
Answer:
1.115 g
Explanation:
Applying,
R = R'[tex]2^{n/t}[/tex]................... Equation 1
Where R = original sample of radon-222, R' = sample of radon-222 left after decay, n = Total time, t = half-life.
make R' the subject of the equation
R' = R/([tex]2^{n/t}[/tex])............... Equation 2
From the question,
Given: R = 73.9 g, n = 23 days, t = 3.8 days.
Substitute these values into equation 2
R' = 73.9/([tex]2^{23/3.8}[/tex])
R' = 73.9/[tex]2^{6.05}[/tex]
R' = 1.115 g
What is the organelle that builds the protein molecules using the instructions from the genes?
1 Gene version
2 nucleus
3 ribosomes
4DNA
5 Golgi Bodies
Please! I need help
Describe how water molecules can hydrate various substances.
Answer:
The two hydrogen atoms and one oxygen atom within water molecules (H2O) form polar covalent bonds. ... As a result of water's polarity, each water molecule attracts other water molecules because of the opposite charges between them, forming hydrogen bonds.
Explanation:
Not my work, but I hope this helps!
how does evelyn hear music?
Which of the following terms best describes the oxide of a metal?
Answer:
Zinc oxide is a metal oxide the term best describes the nature of zinc oxide is an amphoteric oxide.
Explanation:
Please Mark me brainlist
After a 4.626g sample of silver oxide is heated, 4.306g of silver metal remains. What is the empirical formula of the compound?
please help me :(
Answer:
The empirical formula is Ag2O.
The empirical formula is Ag2O.Explanation:
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.The ratio of atoms is the same as the ratio of moles. So our job is to calculate the molar ratio of Ag to 2O.
do the steps ...
To get this into an integer ratio, we divide both numbers by the smaller value.
From this point on, I like to summarize the calculations in a table.
ElementAgMass/gXMolesXllRatiomllIntegers
mAgXXXm7.96Xm0.07377Xll2.00mmm2
mlOXXXXl0.59mm0.0369Xml1mmmml1
There are 2 mol of Ag for 1 mol of O.
Answer:
Hello There!!
Explanation:
The answer is↬The empirical formula is Ag2O. It is the simplest whole-number ratio of atoms in a compound.
hope this helps,have a great day!!
~Pinky~
How many atoms of NaCl are present in 11.0 moles?
58 atoms
642 atoms
6.62 x 1024 atoms
3.51 x 1025 atoms
Answer:
6.62 × 10²⁴
Explanation:
wanna have fun?
The number of NaCl present in the 11 moles is equal to 6.62 × 10²⁴ NaCl. Therefore, option (C) is correct.
What is Avogadro's number?Avogadro’s number is used to express the number of entities in one mole of a chemical substance. Generally, these entities can be ions, molecules, atoms, electrons, or protons, which depends upon the type of chemical reaction.
The value of Avogadro’s constant is experimentally found approximately equal to 6.022 × 10²³ mol⁻¹.
Given, the number of moles of the NaCl = 11.0 mol
The molar mass of the NaCl = 23 + 35.5 = 58.5 g/mol
One mole of NaCl has formula units of NaCl = 6.022 × 10²³
Then 11 moles of NaCl have formula units of NaCl = 11 × 6.022 × 10²³
= 6.62 × 10²⁴ NaCl
Therefore,6.62 × 10²⁴ formula units of NaCl are present in 11 moles of NaCl.
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what rule/principle states that electrons fill orbitals from lowest energy to highest enegery?
Answer:
The Aufbau Principle
Explanation:
In the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy level before occupying higher-energy levels.
Answer:
Aufbau principle
Explanation:
edge 2021
Group 1 period 3 on periodic table
Answer:
unable to compute
Explanation:
What can be found in the Asteroid Belt?
Answer:
astrioids can be found at the astrioid belt
Answer:
Composition. Most of the asteroids in the Main Belt are made of rock and stone, but a small portion of them contain iron and nickel metals. The remaining asteroids are made up of a mix of these, along with carbon-rich materials. Some of the more distant asteroids tend to contain more ices
A 25 Ω resistor has a voltage drop of 12 V across it. Calculate the current flowing through the resistor
Answer:
0.48
Explanation:
[tex]i = \frac{v}{r} [/tex]
because we are looking for I which is current we say
I = 12÷25 which is 0.48.
The current flowing through the resistor is 0.48 A.
What is resistor?The resistor is a length of wire which resists the flow of current.
According to Ohm's law, the potential difference is proportional to the current flowing in the circuit.
V =I R where R is the resistance.
Given is the resistance of resistor R = 25Ω and the voltage drop V =12 Volt, then the current through the resistor will be
I =V/R
I = 12/25
I =0.48 A
Thus, the current in resistor is 0.48 Amperes.
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Calculate the mass of hydrogen in 250 grams of C2H6
Answer:
50.28 grams
Explanation:
hope this helps
(PLEASE HELP DUE TODAY!) A gas has a volume of 1000.0 mL at a temperature of 20.OK and a pressure of 1.0 atm. What will be the new volume when the temperature is changed to 40.0K and the pressure is changed to
0.5 atm?
Answer:
4 L or 4000 mL
Explanation:
This question asks for the use of combined gas law:
(P1)(V1) / (T1) = (P2)(V2) / (T2)
...where pressure (P) is in atm, volume (V) is in liters, and temperature (T) is in kelvin.
1000 ml is 1 L, and everything else is already in the right units.
(1 atm)(1 L) / (20 K) = (0.5 atm)(V2) / (40 K)
Just solve the equation for V2, and you get a new volume of 4 liters
(1)(1) / (20) = (.5x) / (40)
1 / 20 = .5x / 40
2 = .5x
x = 4
If the pH = 6.5, what is the [H+]? *
3.16 x 10-7
3.16 x 10-6
O
3.16 x 10-5
Answer:
Key Concepts
The hydrogen ion concentration in a solution, [H+], in mol L-1, can be calculated if the pH of the solution is known.
pH is defined as the negative logarithm (to base 10) of the hydrogen ion concentration in mol L-1 pH = -log10[H+] ...
[H+] in mol L-1 can be calculated using the equation (formula): [H+] = 10-pH
More items...
Explanation:
Answer:
[tex]pH = - log[H {}^{ + } ] \\ 6.5 = - log[H {}^{ + } ] \\ [H {}^{ + } ] = {10}^{ - 6.5} \\ [H {}^{ + } ] = 3.16 \times {10}^{ - 7} \: mol {dm}^{ - 3} [/tex]
A carbon atom that is surrounded by four hydrogen atoms has a _____ molecular geometry. This geometry results from the arrangement of the _____ hybrid orbitals around the carbon atom. They are formed when the s-orbital and ______ -orbitals mix, or hybridize.
Answer:
Tetrahedral, sp3, p
Explanation:
C has 4 bonds and hence its tetrahedral shape with 109.5 degrees. since there are 4 bonds, it is sp3
Answer:
A carbon atom that is surrounded by four hydrogen atoms has a
✔ tetrahedral
molecular geometry.
This geometry results from the arrangement of the
✔ four sp3
hybrid orbitals around the carbon atom.
They are formed when the s-orbital and
✔ three p
-orbitals mix, or hybridize.
Explanation:
HELP PLSS IF ANYONE KNOWS!!
Answer:
B
Explanation:
Because oxidation is lose of electron and fe2+ means it lost 2 electron hope this helps u to understand:)
Suppose that we combined 75 g of magnesium with 45 g of nitrogen and heat them up. Predict the product of
the reaction, determine the limiting reactant, and calculate the theoretical yield.
Answer:
Mg is the limiting reactant
The theoretical yield is 105.2 g of Mg3N2
Explanation:
3Mg(s) + N2(g) -----> Mg3N2(s)
Number of moles of Mg = 75g/24g/mol = 3.125 moles
3 moles of Mg yields 1 mole of Mg3N2
3.125 moles of Mg yields 3.125 × 1/3 = 1.042 moles of Mg3N2
Number of moles of N2 = 45g/28g/mol = 1.607 moles
1 mole of N2 yields 1 mole of Mg3N2
1.607 moles of N2 yields 1.607 moles Mg3N2
Hence, Mg is the limiting reactant
The theoretical yield of Mg3N2 = 1.042 moles of Mg3N2 × 101 g/mol = 105.2 g of Mg3N2
Which of the following correctly ranks the following bonds in order from most to least polar?
C-H, N-H, O-H, F-H
a)
O-H > F-H > N-H > C-H
b)
F-H > N-H > O-H > C-H
c)
C-H > N-H > O-H > F-H
d)
F-H > O-H > N-H > C-H
Answer:
O-H F-H N-Hy
Explanation:
C-H N-H O-H F-H
Which statement about scientific consensus is true?
what are the options?
reply in comments so i can help:)
The true statement about scientific consensus is that; : It represents the beliefs of most scientists.
What is scientific consensus?The term scientific consensus refers to what is generally accepted as fact by scientists.
Hence, the true statement about scientific consensus is that; : It represents the beliefs of most scientists.
Missing parts;
Which statement about scientific consensus is true? A. It represents the beliefs of most scientists. B. It is the only way to prove a theory true. C. It is necessary to form a hypothesis. D. It is an assurance that the interpretations of a study are correct. E. It is necessary before research can be published in a science journal.
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do goldfish get more oxygen in the wild then the tank
Answer: more in the wild
Explanation:
How many significant figures are in this number?
3x10^6
If it's right 30 POINTS !!!!!!!
(True or false) The water molecule can be either an acid or a base. Justify.
Answer:
TRUE!!!!
Explanation:
Water can act as both an acid and a base in solution and undergoes autoionization, where it can be both an acid and a base to itself. When mixed with an acid, water accepts hydrogen ions and acts as a base. However, when water is mixed with a base, it donates hydrogen ions and acts like an acid.
Not my words! I hope this helps :)
what is the slope of the line segment
-3
-1/3
1/3
3
Answer:
slope = 3
Explanation:
[tex]slope = \frac{3 - 0}{1 - 0} \\ = 3[/tex]
Can anyone solve this for me please.
I appreciate anyone that is helping me with these questions
What is Geothermal Energy?
Answer:
Geothermal energy is basically the thermal energy generated and stored in the Earth. It is the energy that determines the temperature of matter.
Explanation:
I hope this helped :)
Answer:
Geothermal energy is heat that's inside of the ground. It is a renewable energy source because heat is constantly being produced inside of the earth.
Explanation: Hope this helps! :)
Which of the following elements can exist in more than one form in the same
state?
neon
iodine
carbon
iron
Answer:
neon
Explanation:
it comes in different colours
PLEASE HELP
A sample of gas is inside a container. Classify each change based on whether it would increase or decrease the pressure inside the container. Assume that variables not mentioned don’t change.
Drag each tile to the correct location.
Decrease
Increase
Increase
Decrease
Increase
Decrease
Hope this helps! :)
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, in above ways we can give information about pressure changes.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically,
PV=nRT
where,
P = pressure
V= volume
n =number of moles
T =temperature
R = Gas constant = 0.0821 L.atm/K.mol
The pressure will decrease on increasing the volume of container.
The pressure will increase on decreasing the volume of container.
The pressure will increase on increasing the temperature of container.
The pressure will decrease on decreasing the temperature of container.
The pressure will increase on adding the gases to the container.
The pressure will increase on increasing the temperature of container.
The pressure will decrease on decreasing the temperature of container.
Therefore, in above ways we can give information about pressure changes.
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How many grams of NaCl are dissolved in 500.0 mL of a 0.050 M solution of NaCl?
Answer: 1.461 g of NaCl is dissolved in the solution.
Explanation:
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L.
The formula used to calculate molarity:
[tex]\text{Molarity of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Given mass of solute}\times \text{Volume of solution (mL)}}[/tex] .....(1)
Given values:
Molarity of solution = 0.050 M
Molar mass of NaCl = 58.44 g/mol
Volume of solution = 500.0 mL
Putting values in equation 1, we get:
[tex]0.050=\frac{\text{Given mass of NaCl}\times 1000}{58.44\times 500}\\\\\text{Given mass of NaCl}=\frac{0.050\times 58.44\times 500}{1000}\\\\\text{Given mass of NaCl}=1.461g[/tex]
Hence, 1.461 g of NaCl is dissolved in the solution.
Which statement describes one way that nuclear fission differs from nuclear fusion?
Answer:
Nuclear fission is used to produce electrical power.
Explanation:
Both types of nuclear reaction require high temperatures
Answer:
D
Explanation:
The volume of a ball was measured at 500.0 cm?, and its mass was measured to be 404.2 g.
What would be the most accurate calculation of density for the ball? Round to the nearest ten thousandths.
g/cm3
Answer:
0.8084g/cm³
Explanation:
Density of a substance is calculated as follows:
Density = mass/volume
According to this question, the volume of a ball was measured at 500.0 cm³ and its mass was measured to be 404.2g. The density is this:
Density (P) = 404.2/500
Density = 0.8084
Density of the ball = 0.8084g/cm³
Answer:
0.8084
Explanation:
404.2 / 500.0
