Answer:
They cause boys' and girls' bodies to develop
Which substance can be identified as a homogeneous mixture?
chocolate milk
pepperoni pizza
chocolate chip cookie
peanut butter sandwich
Answer:
A) Chocolate Milk
Explanation:
A homogeneous mixture is one that is made of one substance. Technically, none of these are, but chocolate milk would be the closest. Pizza has cheese, pepperoni, and crust. Chocolate chip cookies have chips and the cookie. Peanut butter sandwiches have peanut butter and bread. Therefore, chocolate milk is right, as it has no other parts.
Name one trend observable in a periodic table
Answer:
Major periodic trends include: electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character.
Explanation:
These six are the major trends.
Which statement best describes thermodynamics?
A. The study of how energy changes and moves
B. The study of physical laws acting on matter
C. The study of electricity at low temperatures
D. The study of intermolecular forces in liquids
Answer:
a
Explanation:
A reaction that produces great heat for welding and incendiary bombs
is the "thermite" reaction, Fe2O3 (s) + 2Al(s) Al2O3 (s) + 2Fe (s)
How many moles of iron form by the complete reaction of
7.1 9 of iron (III) oxide ?
Answer:
7.19 g of Fe2O3 will produce 0.092 mole of iron
Explanation:
One mole of Fe2O3 reacts with 2 mole of Aluminum to produce one mole of Al2O3 and 2 mole of iron.
Mass of one mole of Fe2O3 = 159.69 g/mol
Thus, 159.69 g/mol of Fe2O3 produces two mole of Fe
7.19 g of Fe2O3 will produce
[tex]\frac{2}{156.9} * 7.19\\= 0.092[/tex]moles of iron
Use the scenario to answer the following question. A group of students working in a chemistry lab are planning a procedure to neutralize 10.0mL of 5.0 M hydrochloric acid (strong acid) with 5.0 M potassium hydroxide (strong base). In their procedure they plan on adding an equal volume of the base to the acid. What would be the expected outcome of carrying out this step as planned?
a- The resulting pH will be less than 7 because potassium hydroxide is less concentrated than the hydrochloric acid.
b- The resulting pH will not be able to be determined because the concentrations of the acid and base are not the same.
c- The resulting pH will be greater than 7 because potassium hydroxide is less concentrated than the hydrochloric acid.
d- The resulting pH will be equal to 7 because a strong base will neutralize a strong acid.
Answer:
d- The resulting pH will be equal to 7 because a strong base will neutralize a strong acid.
Explanation:
The reaction between potassium hydroxide and hydrochloric acid of equal volume and equal concentration yields a solution of pH 7 at equivalence point. We must note that KOH is a strong base while HCl is a strong acid. This fact influences the pH of the system at equivalence point.
Owing to the fact that the acid is exactly neutralized by the base; at the equivalence point of such titration, it is expected that hydrogen ions(H+) and hydroxide ions (OH-) must have reacted to form water, this leads to a final pH of 7.
Sea turtles use the earths geomagnetic filed to navigate their way home. What is the reason earth has a geomagnetic filed?
Answer:
Due to the iron inside the earth.
Explanation:
Imagine a sphere of Iron, as big as two-third the size of the moon and as hot as 5700 Kelvin. That is the Earth’s core.
The iron core isn't in its liquid form even at that temperature because it is crushed under immense gravity. This core is surrounded by 2000 km of other metals like iron and nickel which are in their molten state.
The temperature is not the same at every point in this molten layer. The hotter and less dense matter rises up, and the warm denser matter sinks. This causes convectional currents in the interior of the Earth.
Because of the Earth’s spin, there is a force that is established called the Coriolis force which causes swirling whirlpools here too.
This flow of molten metals produces electric currents which generate self-sustaining magnetic fields. And as a result of the Coriolis force, all these combined effects add up to produce one big magnetic field engulfing the Earth aligned in one direction.
The goal of this lesson is to answer the lesson
question, "What does half-life 'look like' for a
radioactive substance?" Fill in the blanks to
complete the hypothesis.
Hypothesis: If an element is radioactive, then the
fraction of radioactive atoms v remaining after
n half-life cycles should be approximately n
because...
Answer:
The half life for radioactive can be calculated as:
N /N0 = (1 /2) ^ n
n = T /T half
According to question there are n number of half life are present which would result in remaining amount of element as n.
Explanation:
Sorry if wrong
Answer:
1. atom
2. 0.5n
Explanation:
Because half of the atom's nuclei will decay during each cycle.
If the molar heat of vaporization for water is 40.7 kJ/mol. What is the molar heat of condensation? HELP ME PLEASE!!!
Answer:
not sure hope you have a good day
If the molar heat of vaporization for water is 40.7 kJ/mol. -40.7 kJ/mol is the molar heat of condensation.
What is condensation?Condensation, which is the opposite of vaporization, is the transformation of matter from its gaseous state into its liquid state. The water cycle is the most frequent use of the phrase. Another way to describe it is as the transformation of water vapor into liquid water when it comes into touch with a solid, liquid, or cloud condensation nucleus in the atmosphere.
Deposition is the term for the change that occurs when the gaseous phase directly transitions into the solid phase. Condensation is started when atomic or molecule clusters of such a species form within their gaseous volume, similar to how raindrops or snowflakes form within clouds, or when their gaseous phase comes into contact with a liquid and solid surface.
molar heat of vaporization = 40.7 kJ/mol
molar heat of condensation = -40.7 kJ/mol
Therefore, if the molar heat of vaporization for water is 40.7 kJ/mol. -40.7 kJ/mol is the molar heat of condensation.
To know more about condensation, here:
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Which choice describes the function of the pancreas gland?
A. It secretes hormones that regulate blood sugar levels.
B. It secretes adrenaline to help the body respond to fear.
C. It secretes hormones that regulate water concentration levels.
D. It secretes thyroxine, which is involved in growth.
Answer:
A. It secretes hormones that regulate blood sugar levels.
Explanation:
The pancreas is the organ that helps in the process of digestion of the food. The location of the pancreas is in the abdomen. It helps in the process of digestion of the food and regulating the blood sugar level in the body. It helps in regulating and controlling the glucose level in the body during the process of digestion. Pancreas produces enzymes that are useful in the process of digestion.
Answer:
A
Explanation:
Hi, what are you doing?
Answer:
i am dancing and you ok hom
Definition: These are the layers of rock or soil that are distinguishable from other layers that have been
laid down upon one another over the history of the earth.
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Term: Type term here
Strata are the layers of rock or soil that are distinguishable from other layers that have been laid down upon one another over the history of the earth.
What is a Strata?A strata is the horizontal layer of rocks or sedimentary rocks that are laid upon another or arranged one on top of another that is separated by adjacent beds planes or layers.
Therefore, Strata are the layers of rock or soil that are distinguishable from other layers that have beenlaid down upon one another over the history of the earth.
Learn more about strata below.
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True or False When one side of a molecule is electronegative (δ-) and the other side of the
molecule is electropositive (δ+), it is said to have a dipole moment. Water has
a dipole moment.
Answer:
True; When one side of a molecule is electronegative (δ-) and the other side of the
molecule is electropositive (δ+), it is said to have a dipole moment.
Explanation:
A dipole moment exists in a molecule as a result of differences in the electronegativity values between the atoms of the elements involved in the chemical bonding.
When a strogly electronegative atom such as oxygen or chlorine is chemically bonded to a less electronegative or an electropositive atom such as hydrogen, there is an uneven sharing of the electrons involved in the bonding. The more electronegative atoms tends to draw the shared electrons mostly to themselves. This induces a partially negative charge (δ-) on them while leaving the electropositive atoms with a partially positive charge (δ+).
Water is an example of a molecule having a dipole moment. The oxygen atoms are more electronegative than hydrogen and as such draw the shared electrons to themselves more, inducing a partial positive charge (δ+) on the hydrogen atoms while they themselves develop a partial negative charge (δ-).
2L of hydrogen has an initial pressure of 750 mmHg, what is the final pressure in mmHg if the volume increases to 20 L with a constant temperature of 37 degrees C?
Answer: The final pressure is 75 mm Hg.
Explanation:
According to Boyle's law, at constant temperature the pressure of a gas in inversely proportional to volume.
Since, it is given that the temperature is constant. Hence, formula used is as follows.
[tex]P_{1}V_{1} = P_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]P_{1}V_{1} = P_{2}V_{2}\\750 mm Hg \times 2 L = P_{2} \times 20 L\\P_{2} = \frac{750 mm Hg \times 2 L}{20 L}\\= 75 mm Hg[/tex]
Thus, we can conclude that the final pressure is 75 mm Hg.
A solution is prepared by mixing 2.50g of CaCl2 with 50.0g H2O, what is the mass percent of CaCl2?
A. 3.76%
B. 4.76%
C. 5.76%
D. 6.76%
A sample of ideal gas at room temperature occupies a volume of 10.0 L at a pressure of 302 torr. If the pressure changes to 1510 torr
with no change in the temperature or moles of gas, what is the new volume, V2?
Explanation:
boyles law; P1V1=P2V2
302×10=1510×V2
V2=2L
What type of reaction is illustrated?
C3H8 +502 + 3C02 + 4H2O
А
B
decomposition
combustion
single
replacement
Answer:
Combustion
Explanation:
the correct order of increasing ionisation energy of Na,Al,Si and Mg elements is?
Removal of an electron from stable, fully filled orbital requires more energy than removal of electron from partially filled orbital. Thus, ionisation enthalpy for Mg is greater than ionisation enthalpy for Al. So, the correct order of first ionization enthalpies is: Na<Mg>Al<Si.
b. What three products are necessary in order for a hydrocarbon combustion reaction to take place?
Explanation:
Description. Regardless of the type of hydrocarbon, combustion with oxygen produces 3 products: carbon dioxide, water and heat, as shown in the general reaction below.
All of the following are advantages of nuclear power EXCEPT: uranium mines cause less environmental damage than coal mines because less uranium is needed to generate power. nuclear power plants generate no nitrogen oxides and sulfur dioxide. uranium generates far greater amounts of energy than coal by weight or volume. the power-generating process is emission-free. nuclear wastes can be safely disposed of.
Answer:
nuclear wastes can be safely disposed of
Explanation:
In comparing fossil fuel power plants with nuclear power plants, it is obvious that fossil fuel power plants lead to a large volume of emission of oxides of carbon and sulphur.
Also, a larger volume of coal needs to be burnt to generate energy compared to a minute amount of uranium fuel that can sustain a nuclear power plant for a long period of time thereby reducing the environmental damage associated with mining of the fuel.
However, the problem of nuclear waste disposal have remained a thorn in the flesh. It is often difficult to safely dispose of spent uranium fuel. This is a major disadvantage of the use of nuclear power.
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How many moles are in 60.05 g of carbon
Answer:
moles =60.05/12
moles=5.0041
moles=5(approx)
A mountaineer is climbing a very tall mountain. She has bottled oxygen (oxygen gas in a rigid, metal cylinder) with her, and she breathes the oxygen on the ascent. At the summit, she stops breathing the bottled oxygen and descends safely to the base of the mountain. The temperature on the summit is –15°C, and the temperature at the base is 20°C. Describe how the change in temperature and the change in the amount of gas in the oxygen cylinder affect the pressure of the gas inside the cylinder during the ascent and descent of the mountain
Answer:
When the temperature and the amount of gas decrease, the pressure decreases.
Explanation:
At the base of the mountain, the temperature is 20 °C (293 K) and as she climbs, the temperature on the summit decreases to -15 °C (258 K). We can see the effect of the temperature on the pressure using Gay-Lussac's law.
P/T = k
P = k × T
As we can see, there is a direct relationship between P and T. So, when the temperature decreases, the kinetic energy of the gas does as well, and consequently, the pressure decreases.
Also, as the mountaineer consumes oxygen, the number of moles (n) of oxygen decreases. We can appreciate the effect on the pressure using the gas ideal equation.
P × V = n × R × T
P = n × R × T / V
There is also a direct relationship between n and P. When the amount of gas decreases, so does the pressure.
A cylinder of gas with a pressure of 8.0 atm is heated from 300. K to 600. K. What will the new pressure of the gas be?
Answer:
[tex]P_2=16atm[/tex]
Explanation:
Hello there!
In this case, according to the given information, we can infer we need to use the Gay-Lussac's equation it order to understand this pressure-temperature relationship as shown below:
[tex]\frac{P_1}{V_1}=\frac{P_2}{V_2}[/tex]
Thus, we solve for P2 and plug in P1, T1 and T2, to obtain:
[tex]P_2=\frac{P_1T_2}{T_1}\\\\P_2=\frac{8atm*600K}{300K}\\\\P_2=16atm[/tex]
Regards!
When considering the equilibrium between copper(I) carbonate and its aqueous ions, what could be added to solution to promote the precipitation of copper(I) carbonate
Answer:
potassium carbonate
Explanation:
Let us consider the equilibrium for the dissociation of copper I carbonate;
Cu2CO3(s)------>2Cu^+(aq) + CO3^2-(aq)
Now we need to add a substance that has a common ion with the solute. The addition of this substance will decrease the solubility of the solute thereby increasing the concentration of the promote the precipitation of copper(I) carbonate precipitate in the system.
Hence, addition of potassium carbonate promotes the precipitation of copper(I) carbonate.
Which equation represents a transmutation?
Answer:
A
Explanation:
edge21
A quantity of gas was cooled from 323 K to 273 K. Express this temperature
difference in degrees Celsius and Kelvins. What do these temperatures
represent about the gas particles? Which temperature scale is a more accurate
depiction of this representation? Explain briefly.
Answer:
give more details
Explanation:
What are some of the common characteristics for the elements in a group? Use examples to support your explanation.
Answer:
The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements
Explanation:
Elements are the simplest complete chemical substances. Each element corresponds to a single entry on the periodic table. An element is a material that consists of a single type of atom. Each atom type contains the same number of protons.
When does surface water become
groundwater?
Answer:
When it rains or snows. Basically as soon as it hits the ground.
Explanation:
Groundwater begins as rain or snow that falls to the ground. This is called precipitation but only a small portion of this precipitation will become groundwater
mplete the following Charles' Law calculations. If the current temperature is 25 degrees C and you have a 2L balloon, identify the new volume of the balloon if you increase the temperature to 30 degrees C. Remember to change Celsius to Kelvin: K= C + 273.
Answer:
New volume = 2.03 L
Explanation:
Given that
Initial temperature, T₁ = 25°C = 298 K
Initial volume, V₁ = 2L
Final temperature, T₂ = 30°C = 303 K
We need to find the final volume. The mathematical form of Charle's law is given by :
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\\V_2=\dfrac{V_1T_2}{T_1}[/tex]
Put all the values,
[tex]V_2=\dfrac{2\times 303}{298}\\\\V_2=2.03\ L[/tex]
so, the new volume is equal to 2.03 L.
Which chemical equation is balanced as written?
PLS ANSWER FAST
Answer:
THERE ANSWER IS C
Explanation: