14. A gas in a 400 ml flask exerts pressure of 81.0 kPa at 25.0°C. If the gas
was in a 250 ml container at a pressure of 101 kPa, the temperature would be
a) - 124 °C
b) - 41.2°C
c) 20.0°C
d) 232 °C

Answer:

human migration

Explanation:

Answer:

I think its D

Explanation:

Answer:

D: Na

Explanation:

Hope this helps!

Have a nice day!!

:D

Answer:

true

Explanation:

from Newton's second law of motion ,we can understand that acceleration of a body is directly proportional to the force applied on it and inversely proportional to its mass ,so as the force applied increase,the acceleration also increases

Answer:

pro ca help defeat diseases, con the stem cell might cause harm

Explanation:

The stem cells are used in regenerative medicine to reproduce the body organs and replace the damaged orangs. The disadvantage of stem cells is that it is difficult to culture the stem cells, and they can be transformed into cancerous cells.

Embryonic stem cells can be described as pluripotent stem cells derived from the inner cell mass of a blastocyst. Human embryos can reach the blastocyst stage 4 to 5 days post fertilization, at which time they contain 50 to 150 cells.

Isolating the inner cell mass using immunosurgery results in the destruction of the blastocyst, a process that raises ethical issues,  at the pre-implantation stage have the same moral considerations as embryos in the post-implantation stage of development.

Potential uses of stem cells include the treatment of diabetes and heart disease. The cells are being analyzed or studied to be used in clinical therapies, genetic disorders, and cellular/DNA repair. However, adverse effects in the research processes and clinical processes such as tumors and unwanted responses have been reported.

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Non-metals will never replace metals or vice versa, they'll only replace itself or the only type of reaction that it is or element that it is.

Answer:

Molecularity is the number of ions or molecules that take part in the rate determining step

Order of reaction is the number of molecules of reactant whose concentration changes during the chemical change

Answer:

the answer is A

Explanation:

in 60 seconds there is 1 minute and in 60 minutes there is one hour

Answer:

Mass, volume, width, height, etc.

Explanation:

Extensive properties depend on the amount of material where intensive properties (color, luster, taste, odor, density, temperature, melting/boiling point) don't.

Answer:

1st blank : Atoms

2nd blank : Reactants

I'm still trying to find the 3rd blank. I'll put it in comments if I find it

Explanation:

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The empirical formula of a compound that consists of 0.039 moles of iron atoms combined with 0.052 moles of oxygen atoms is FeO[tex]\rmFeO_{2}[/tex].

The simplest whole number ratio of atoms in a compound is the empirical formula of a chemical compound in chemistry. Sulfur monoxide's empirical formula, SO, and disulfur dioxide's empirical formula are two straightforward examples of this idea.

The simplest whole number ratio of each type of atom in a compound is its empirical formula. It can be determined from data on the mass of each component in a compound or from the composition's proportion.

calculation:

Fe = 56/0.039 = 150

O = 16/0.052 = 300

in simplest term ratio is 1:2

Thus, empirical formula is FeO[tex]\rmFeO_{2}[/tex].

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The part that contains the information that a plant cell uses for growth and activities is known as Chromosome. Thus, the correct option for this question is C.

Chromosomes may be defined as thread-like structures that appear during cell division. These structures are present in the nucleus of the cell and are made up of DNA, RNA, histones, and some non-histone proteins.

Chromosomes were first discovered by E. Strasburger in 1875. But the term chromosome was given by Waldeyer in 1888. Ultimately, the nucleus of the cell contains all sorts of genetic information which are essential for the growth and activities of organisms.

The Nucleus contains DNA which is known as the genetic material of most organisms including plants.

Therefore, a chromosome is a part that contains the information that a plant cell uses for growth and activities. Thus, the correct option for this question is C.

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Answer:

its c  I truly believe that it is c

Explanation:

Answer:

6

Explanation

every p sublevel holds up to 6 electrons

so the 4p sublevel  must hold up to 6 electonsr

The wave B has wavelength of 415 nm. The value for c is 3.00 x 10 8 m/s. The frequency is 7.22 x 10¹¹ Hz.

Frequency is defined as the number of waves passing through a fixed point in a given amount of time.

The frequency can also be defined as a repeated event is the number of occurrences per unit of time.

Frequency can be expressed as

f = c / ∧

Where c = 3.00 x 10⁸ m/s

           ∧ = 415 nm

So, f = 3.00 x 10⁸ m/s x 415 nm

      f = 7.22 x 10¹¹ Hz.

Thus, the wave B has wavelength of 415 nm. The value for c is 3.00 x 10 8 m/s. The frequency is 7.22 x 10¹¹ Hz.

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Answer:

In Iron (II) oxide, ratio is 1:1

In iron (III) oxide, ratio is 4:2

[tex].[/tex]

In Iron (II) oxide, ratio is 1:1

Iron oxides are very important components in most soils as they have major influence on chemical, physical, and microbial properties of soils. Because of their nanoparticulate size (usually 5-200 nm), iron oxides possess large specific surface area.

Generally, iron oxides are prevalent, widely used as they are inexpensive, and play an imperative role in many biological and geological processes. They are also extensively used by humans, eg, as iron ores in thermite, catalysts, durable pigments.

When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide. The iron oxide typically has a reddish, flaky appearance that becomes progressively worse over time.

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Answer:

1 colonists

2 England

3 slaves

4 the House of Burgesses

Answer:

:)

Explanation:

Answer:

An object's thermal energy is dependent upon its temperature and mass. The higher the temperature of a given quantity of a substance, more is its thermal energy. Similarly, for the same temperature, higher mass of a substance will contain more thermal energy

Considering the reaction stoichiometry, the quantity of moles of H₂O produced is 3.02 moles.

The balanced reaction is:

CuO + H₂ → Cu + H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:  

The molar mass of the compounds present in the reaction is:

Then, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:  

Then, it is possible to determine the moles of H₂O necessary by the following rule of three:  If by reaction stoichiometry 79.55 grams of CuO produces 1 mole of H₂O, 240 grams of CuO produces how many moles of H₂O?

[tex]molesofH_{2} O=\frac{240 grams of CuOx 1 mole ofH_{2} O }{79.55 grams of CuO}[/tex]

moles of H₂O= 3.02 moles

Finally, the quantity of moles of H₂O produced is 3.02 moles.

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Remember these followings :-

Acid + Base = salt + water

Acid + metal = salt + hydrogen

Acid + carbonates = salt + water + carbon dioxide

Base + ammonium salt = salt + ammonia + water

Base + acidic oxide = salt + water

I hope that you will be clear via these formulas.

Answer:

in the periodic table we can see that the ions of Cl is greater than the ions in Na

Cl- ion is bigger than Na+ ion because of the presence of more number of electrons.

The atomic number of sodium+ ion is 10 means it has 10 number of electrons which can accommodate into 2 shells or orbits while on the hand, chlorine- ion has atomic number 18 means it has 18 number of electrons which can be accommodate into 3 shells or orbit.

So there is one shell more in chlorine ion as compared to sodium ion which make the size of chlorine ion large so we can conclude that chlorine ion is bigger than sodium ion.

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Answer:

Plate tetonics theory is the idea that different tectonic plates, are constantly moving and changing the surface of our Earth. They can move in three ways, convergent, divergent, and transform. Seafloor Spreading is like an example of divergent movement. When the plates diverge from each other it can create various changes such as creating a new sea floor. You can use seafloor spreading as an example of the plate tetonics theory.

Explanation:

Answer: The condensation is the process which causes distance.

Answer:

Copper = Cu

Gold = Ag

Iron = Fe

Potassium = K

The compound formed is the quaternary ammonium salt N,N,N-trimethyl-1-phenylmethanaminium iodide.

Quaternary ammonium salts are formed when methyl iodide reacts with an amine. The quaternary ammonium salt is an ionic substance which often has a high melting point. Remember that the melting point of a substance can be used to identify the substance.

In this case, a student reacted 40 drops of an unknown amine with 20 drops of iodomethane in 2 ml of a suitable solvent mixture. after 15 minutes of reaction, a white precipitate formed. the precipitate was isolated and its melting point was recorded to be 178 °c. This precipitate must be N,N,N-trimethyl-1-phenylmethanaminium iodide (Benzyltrimethylammonium iodide) because it is a quaternary ammonium salt whose melting point is 178 °c.

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Answer:

whatttttttttttttttttttttttt

Answer:

Breaking glass - chemical change

popsicle - physical

milk - chemical

bread - physical

roasting - chemical

egg - chemical

fireworks - chemical

mixing something with water - chemical

popcorn - chemical

colouring hair - physical

melting chocolate - physical

crumpled paper - physical

rusted nails - chemical

crushed can - physical

cooked egg - chemical

bending metal - physical

melting ice - physical

bleaching clothes - chemical

If u want to differentiate between chemcial and physical change u need to remember this-

physical change - no new substance is formed (Even for melting of ice it's still water) and it can be reversible, except for some cases like tearing of paper

chemical change - a new substance is formed

Answer:

1.20 atm

Explanation:

A container contains three gases. If the partial pressure of carbon dioxide is 0.50 atm, the partial pressure of nitrogen is 0.30 atm, and the partial pressure of methane is 0.40 atm, what’s the total pressure inside the container?

Do not let chemistry questions SCARE you!  The TOTAL means

ADD THEM UP.

You can do this without a scientific calculator :-)

0.50 +0.30 + 0.40 = 1.20 atm

Answer:

i have no clue

Explanation:

umm cause i have no clue sorry lol but good luck

Answer:

The gain in mass by the negative electrode is the same as the loss in mass by the positive electrode. So the copper deposited on the negative electrode must be the same copper ions that are lost from the positive electrode.

Answer:

Below

Explanation:

The reaction is a Substitution SN1 mechanism