Answer:
C
Explanation:
just took the test
Which of the following is NOT a skill scientists use to learn about the world? a. Predicting c. Inferring b. Observing d. Scientists use all of the above skills Please select the best answer from the choices provided A B C D
help pls
plspspslslslsl
Answer:
see below
Explanation:
K.E. = 1/2 * m * v^2
= 1/2 * 2 * 5^2 j
Prepare 100. ml of 0.1 N H2SO4 by diluting from original H2SO4.
Eq. wt. of H,SO4 = 98/2=49 .
d H2SO4= 1.08
Purity =98%
Density for 98% = 1.84 g/mL
V M = # mol
0.1 L x 1 M = 0.1 mol
0.1 mol x 98 g/mol = 9.8 g
m =%CDV
9.8 g = 0.98 x 1.84V
V = 5.43 mL
take this volume and carefully (acid to ater) dilute till 100 mL
how many o2 molecules are present in 0.470 of oxygen gas
Answer:
The number of molecules in 16 grams of oxygen gas is 3.01*10^23, equal to half of Avogadro's number
Explanation:
Which is an example of an instinct?
Answer:
An innate, typically fixed pattern of behavior in animals in response to certain stimuli.
The question is in the photo
The required moles of AgBr precipitate produced by given moles of silver nitrate is 0.0123.
How do we calculate moles from molarity?Molarity of any solution is define as the moles of solute present in per liter of the solution and it will be represented as:
M = n/V
Given that, molarity of AgNO₃ = 0.250M
Volume of AgNO₃ = 49.5mL = 0.0495L
Moles of AgNO₃ = (0.25)(0.0495) = 0.0123mol
Given chemical reaction is:
2AgNO₃(aq) + CaBr(aq) → 2AgBr(s) + Ca(NO₃)₂(aq)
As it is mention that CaBr is present in excess quantity and AgNO₃ is the limiting reagent so the formation of precipitate will depend on the AgNO₃.
From the stoichiometry of the reaction, it is clear that:
2 moles of AgNO₃ = produces 2 moles of AgBr
0.0123 moles of AgNO₃ = produces 2/2×0.0123=0.0123 moles of AgBr
Hence 0.0123 is the required moles of precipitate.
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How many Hydrogen atoms are in 4HN₃?
Bonding with intermolecular forces:
1.) is CH3CI a hydrogen bonding? yes or no?
2.) is CH3CI dipole-dipole interactions? Yes or no?
3.) is CH3CI a london dispersion forces? Yes or no?
Answer:
1. yes
2. yes
3. No
Hope this helps!!
Arrange these elements according to atomic radius.
Largest radius
Smallest radius
Answer Bank
K
Ca
Mg
Be
Rb
Answer:
straight to the point:
Explanation:
atomic radius of :
k = 280 pm
Ca = 231 pm
Mg = 173 pm
Be = 153 pm
Rb = 248 pm
pm means "picometers".
so knowing this we will have :(largest to smallest),
k
Rb
Ca
Mg and
Be.
hope this helps .
Is it true you can make Napalm with diesel and styrofoam?
Answer:
Yes. Diesel works the best.
Explanation:
Homemade Napalm can be made using the following procedures; Using an enormous container, fill it about halfway with gasoline. Which means Diesel works the best. Break the special soap, Styrofoam(polystyrene), plate into small pieces.
What volume of 1/5 M and 1/8 M HCl solution must be mixed to obtain 3 L of 1/7 M HCl?
0.72 L and 2.28 L of 1/5 M and 1/8 M HCl solution are required respectively to obtain 3 L of 1/7 M HCl.
What is the concentration of a solution?The concentration of a solution is the amount of substance a given volume of the solution of that substance.
The final concentration and volume of the mixture is 3 L of 1/7 M HCl.
Let the volume of 1/5 M and 1/8 M HCl solution required be X and Y respectively.
X + Y = 3 L
Liters of y = 3 -
[.0.2 X + 0.125 * (3-X)] / 3 = 1/7
(0.2X + 0.375 - 0.125X) / 3 = 1/7
(0.075 X / 3) = 1/7 - 0.375/3
(0.075X / 3) = 0.018
Multiplying both sides by 3
0.075 X = 0.054
X = 0.72 L
Y = 2.28 L
Therefore, 0.72 L and 2.28 L of 1/5 M and 1/8 M HCl solution are required respectively.
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5. Most frogs live both in water and on land, leading to a variety of characteristics. How does a frog us
its lungs to survive in one of these environments? (SC.5.L. 17.1)
A. They allow the frog to breathe underwater.
B. They allow the frog to breathe on land.
C. They allow the frog to maintain a constant body temperature.
. They allow the frog to use less energy when jumping long distances.
How many milliliters of this solution are required to prepare 1.00 L of 0.130 M K2Cr2O7 ?
Answer:
First you'll need to divide the mass of K2Cr2O7 by its molar mass and volume which should be easy but I'll do some of it to help you out
Explanation:
[tex]K_{2}Cr_{2}O_{7}[/tex]
[tex]2K = 39.098 = 2(39.098) = 78.196[/tex]
[tex]2Cr = 51.996 = 2(51.996) = 103.992[/tex]
and
[tex]7O = 15.999 = 7(15.999) = 111.993[/tex]
[tex]78.196 + 103.992 + 111.993 = 294.181[/tex]
so that's the mass of K2Cr2O7 and then you divide it by the molar mass and volume.
Hopefully you can do that on your own! Hope I helped a bit atleast and I have a good feeling about 0.438 but I don't want you to just guess
Please I need the answer asap
The specific heat of water is 4.184 J/g·K. How much energy must be added to 100.0 g of water to raise the temperature of water from 22.0 ºC to 90.0 ºC?
a. 2.84 kJ
b. 136 J
c. 28.4 kJ
d. 6800 J
The energy needed to raise the temperature of water from 22.0ºC to 90.0ºC is c. 28.4 kJ.
What is specific heat?The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.
By the formula [tex]Q = mc\Delta T[/tex]
Q is the heat
m is the mass
c is the specific heat
Now, c = 4.184 J/g.K
The change in temperature is 22.0 ºC to 90.0 ºC
Putting the value in the equation
[tex]Q = 100 \times 4.184 \times (90.0 - 22.0)\\\\Q = 4.184 \times 68.0\\ \\Q= 284.5 \;J[/tex]
Thus, the energy needed to raise the temperature of water from 22.0ºC to 90.0ºC is 28.4 kJ
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Give an example of another metal
Answer:
Examples of metals are aluminium, copper, iron, tin, gold, lead, silver, titanium, uranium, and zinc.
Explanation: This is was makes a metal a metal: it needs to be:
high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light.
would you prefer to live your dream forever or sacrifice you living your dream to let everyone else live their dream forever (brainliest)
I would perfer to prefer to live my dream forever because I wouldn't let someone be stuck with my dream forever because I would rather tourture my self other than to toutour everybody else.
I would rather let everyone else live their dream, because living a dream forever after a certain point would get boring, no matter how fun it seems. Additionally, just because I sacrifice me having my dream doesn't mean I wouldn't be able to enjoy life. It just means that I wouldn't be able to live out my best scenario.
What type of system is associated with weather that has lots of clouds and thunderstorms with the possibility of tornadoes?
A.
low pressure system
B.
arctic system
C.
circulatory system
D.
high pressure system
Answer:
A. Low pressure system
Explanation:
A low pressure system allows for more cloud development. I think of it as in, since the clouds have low pressure on them they can do whatever they want but if the clouds have a high pressure on them, they tend to not do much and most of the time not even form.
I hope this helps, good luck :)
The formula relating mass and weight is W=
Answer:
The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg.
Explanation:
W=F=M x GThe measurement of the effect of gravity on an object's mass is called weight. While mass m is a measurement of the object's amount of matter. W=mg provides the weight.
What is the formula relating to mass and weight?The formula W (weight) = m (mass) times g (gravity, on Earth typically measured at 9.8 N/kg) allows you to determine something's weight from its mass and vice versa.
The common weight calculation formula is W = mg (N/kg). Here, "g" stands for the acceleration brought on by gravity. The value of g on earth is 9.8 m/s2. Other names for it include the gravitational constant.
A body's mass, which is a measurement of how much matter it contains, is equal to its weight when multiplied by the acceleration caused by gravity. The SI unit of weight is the Newton, and the SI unit of mass is the kilogramme (kg) (N).
Thus,The formula relating mass and weight is W=mg.
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carbon reacts with oxygen to produce carbon dioxide (CO2(g),deltaHf=-393.5kl/mol)according to the equation below
The heat required to form 1 mole of carbon dioxide from carbon and oxygen is 393.5 kJ/mol.
What is the enthalpy of formation?Enthalpy of formation of a substance is the heat required to form 1 mole of a substance from its reactants.
Carbon reacts with oxygen to produce carbon dioxide.
The enthalpy of formation of carbon dioxide is -393.5 kJ/mol.
Therefore, the heat required to form 1 mole of carbon dioxide from carbon and oxygen is 393.5 kJ/mol.
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Drag each label to the correct location on the chart.
Classify the natural resources as renewable or nonrenewable.
Water, Natural Gas, Sunlight, Wind, Wood, Coal, Oil, Uranium, Metal ores
Natural resources are the resources that are generated and found in nature. Water, wood, sunlight, and wind are renewable sources of energy.
What is renewable and non-renewable energy?Renewable sources of energy are the resources that replenish after depletion over time and are not limited in amount. They get reloaded through the natural process over finite time.
Wind or the air, sunlight from the sun, water, and wood from trees are some examples of renewable sources of energy.
Non-renewable sources of energy are the resources that cannot be easily replenished by natural means after overconsumption as the process of the formation takes hundreds of billions of years.
Oil, natural gases, coal, uranium, and metal ores are nonrenewable sources of energy.
Therefore, natural resources can be renewable or non-renewable.
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What type of weather front would be responsible for the following forecast: "a period of heavy rain within the next 24 hours followed by warmer temperatures. Thunderstorms and possibly thundershowers from the period of 24 to 30 hours from now with temperatures dropping by 20-25 degrees F and barometric pressure dropping by 15-20mb. Snow beginning 30-36 hours from now, accumulation of 10-13 inches possible. Cooler temperatures and clear skies in 2 days."
The kind of weather front that would be responsible for the forecast given above is:
"Cooler temperatures and clear skies in 2 days."
A weather front in Meteorology refers to the zone where transition occurs between two different air masses a the surface of the earth. That is, you have warm air (which usually results in low pressures, and of course rain) and cold air.
Warm air creates rain because a warm mass of air will hold moisture collected from a large geographical space. This air cools as it rises, then eventually transits into precipitation - rain.
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Sugar is easily soluble in water and has a molar mass of 342.30 g/mol. What is the molar concentration of a 246.8 mL aqueous solution prepared with 72.1 g of sugar?
Answer:
.853 M
Explanation:
(72.1 g / 342.3 g/mole) / (246.8 ml /1000 ml/l )= .853 M
If the magnetic energy stored by a 0.50 H inductor is 3.6 J, what is the current through it?
A. 0.13 A
B. 0.90 A
C. 1.8 A
D. 3.8 A
E. 5.4 A
The current passing through the inductor is 3.8 A. The correct option is D. 3.8 A
Energy stored in a magnetic fieldFrom the question, we are to determine the current passing through the inductor.
From the formula, for the energy stored in a magnetic field
E = 1/2LI²
Where E is the energy
L is the inductance
and I is the current
From the given information,
E = 3.6 J
L = 0.50 H
Putting the parameters into the formula, we get
3.6 = 1/2 × 0.50 × I²
3.6 = 0.25 × I²
I² = 3.6 ÷ 0.25
I² = 14.4
I = √14.4
I = 3.7947
I ≅ 3.8 A
Hence, the current passing through the inductor is 3.8 A. The correct option is D. 3.8 A
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What kinda worm is sometimes used to prevent blood clots
Answer:
Leeches
Explanation:
leeches secrete peptides and proteins that work to prevent blood clots
Answer:
Leeches
Explanation:
They aren't as commonly used as they may have been in places such as ancient Rome or Egypt. But leeches are still used today, even in procedures such as microsurgery. Leeches secrete polypeptides and enzymes that work to prevent blood clots. So they can be useful when it's crucially necessary to avoid bloodclots during a procedure.
What happens if you ignite flint and steel around obsidian?
Answer:
Nothing.
Explanation:
Onsidians reaction point is 1,830'f.
Explain why the ionic radii for S^-2 is larger than O^-2?
Answer:
When comparing two ions, gaining the same electrons, atomic radii, you can follow the same general rule as regular ionic radius.
Explanation:
In general, Sulfur has a larger atomic radius than Oxygen, as it is lower on the periodic table. Since they both are gaining the same amount of electrons, the trend still applies
HELPPPPPPP A certain reaction is endothermic in the forward direction. The reaction has less moles of gas on the product side. Which of the following stresses would increase the yield of the products (shift right)? (5 points)
Group of answer choices
Increasing the pressure
Decreasing the temperature
Increasing the volume
Decreasing the reactant concentration
Answer: Option A
Explanation:
Increase in temperature will increase the yield of the product and cause a shift to the right.
What is an Endothermic reaction?
This is the type of reaction in which reactants absorb heat energy from the surroundings to form products.
This depicts that an increase in temperature will increase the yield of products thereby making option A the most appropriate choice.
state three chemical properties of hydrochloric acid
Explanation:
Hcl is the one of the strongest acids as it disassociates almost everything. Its Chemical formula is HClIt has a unique pungent smell. it is commonly used in laboratories used for both in its aqueous and gaseous formHope it helps...
Answer:
H2o,hydrogen,carbonoxide
Bonding with intermolecular forces:
1.) is CH3Br a hydrogen bonding? yes or no?
2.) is CH3Br dipole-dipole interactions? Yes or no?
3.) is CH3Br a london dispersion forces? Yes or no?
Answer:
1. yes
2. yes
3. no
sorry if wrong but hope this helps
Which of these data points is the most reliable?
Answer:
third point
Explanation:
omniscient because it gives info about every character instead of one
hope this helps