what is combined gas laws

Answer: to protect giant pandas

Explanation:

If only an element’s atomic number and weight are provided, the number of protons, electrons and neutrons can also be determined.

The atomic number of an element is the number of protons in an atom while the mass number is the sum of the atomic number and the number of neutrons.

An atom has three subatomic particles namely;

The number of protons of an element is the atomic number of that element.

This means that if only an element’s atomic number and weight are provided, the number of protons, electrons and neutrons can also be determined.

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Answer:

(Question) If only an element’s atomic number and weight are provided, what other atomic information can be determined for a neutral atom?

(Answer) the number of protons, electrons and neutrons

(Question) What quality differentiates hydrogen (H) from the other elements in group 1, the alkali metals?

(Answer) It is a non-metal.

(Question) On which atomic property proposed by Henry Moseley is the current periodic table of the elements based?

(Answer) atomic number

(Question) You plan to pass alpha particles through a field that contains a consistent type of particle. Which configuration will result in the largest deflection of alpha particles?

(Answer) low-energy alpha particles passing through a field of high mass-number-particles

(Question) Which statement about metals and nonmetals is correct?

(Answer) Metals can be hammered into thin sheets, and nonmetals are brittle.

(Question) Based on properties of elements in the periodic table, which element is the best conductor of thermal energy?

(Answer) vanadium (V)

(Question) Which element has four valence electrons?

(Answer) silicon (Si)

(Question) Which statement best explains why hydrogen’s atomic number is equal to its mass?

(Answer) Hydrogen does not have any neutrons.

(Question) Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)?

(Answer) Francium has fewer valence electrons, but they are in a higher energy level.

(Question) Why are the noble gases the least reactive elements?

(Answer) They have a full valence electron shell.

(Question) Group 2 elements have two valence electrons. Which kind of bond will they most likely form, and why?

(Answer) An ionic bond is likely because they will want to give away two valence electrons in order to become stable.

(Question) How many electrons can carbon accept from other atoms while bonding?

(Answer) four

(Question) An element has six valence electrons. Which ionic charge will its ion carry?

(Answer) 2-

Questions 14, 15, & 16 are written responses good luck.

Explanation:

Answer:

6.6g

Explanation:

The scientific theory that describes how organisms change through time is known as the Theory of Evolution by Natural Selection. Charles Darwin initially put out the hypothesis in 1859, and it has since gained widespread acceptance among scientists.

The fundamental tenet of the idea is that creatures that have characteristics that are more suited to their environment are more likely to survive and reproduce, passing on their favourable features to their progeny.

Natural selection is the main method through which organisms change over time. In addition to natural selection, other processes like mutation and genetic drift also contribute to the evolution of species. A number of studies have supported the Theory of Evolution by Natural Selection.

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When 16.45 g sample of NaCl is dissolved in enough water to make 1.000 l of solution, the solution has a molarity equal to 0.2815 moles NaCl/L solution.

Molarity, or molar concentration, is defined as the number of moles of solute per liter of solution. It can be calculated using the formula given by:

M = n/v

where M = molarity

n = number of moles of solute

v = volume of solution

If the mass of the solute NaCl is 16.45 g, divide it with the molar mass of NaCl to get the number of moles of solute.

n = m/MM

n = 16.45 g/58.44 g/mol

n = 0.2814852841 moles NaCl

If 0.2814852841 moles NaCl is dissolved in enough water to make 1. 000 l of solution, solve its molarity.

M = n/v

M = 0.2814852841 moles NaCl/1.000 l solution

M = 0.2814852841 moles NaCl/L solution

M = 0.2815 moles NaCl/L solution

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Answer:

Not quite, they are different catagories.

Explanation:

A molecule is two or more atoms connected to each other. An element is an atom with a name. Think of water, a single water molecule is called H2O because it has two hydrogen atoms and one oxygen atom. Hydrogen and oxygen are both elements. Another way to see it is like, there are many kinds of animals(atoms). A specific animal would be a cat or a bird or something(the elements).

TLDR: An element can be part of a molecule, but is not one on its own.

Answer:

hydrogen bonds

Explanation:

the strongest of all bonds

How can you identify the reactant that is restricting a chemical reaction while watching it take place? ”

Building scientific knowledge, or discovering rules and positing ideas that may explain natural or social occurrences, is the aim of scientific study. It is crucial to recognize that this knowledge might be inaccurate or perhaps quite distant from the truth.

A hypothesis, or an anticipation about how a certain process or phenomena operates, is typically the subject of an experiment. However, an experiment may also seek to address a hypothetical issue or support earlier findings without having any preconceived notions about what would be revealed.

In this lab experiment, you will react copper(ll) chloride and aluminum. You will look for clues as to which substance was in excess and which

limited the reaction. Write an investigative question that describes the

scientific goals of this experiment. Make sure that your question applies to any reaction. Investigative Question:

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The osmotic pressure of the sucrose solution is 16.845 atm. To calculate the osmotic pressure of the solution, we first need to determine the molarity of the sucrose solution.

The molarity (M) is the number of moles of solute per liter of solution.

1. Convert the mass of sucrose to moles:
(120.0 g sucrose) / (342.3 g/mol) = 0.3504 moles sucrose

2. Convert the volume of water from milliliters to liters:
551 mL * (1 L / 1000 mL) = 0.551 L

3. Calculate the molarity of the sucrose solution:
M = (0.3504 moles sucrose) / (0.551 L) = 0.636 mol/L

Next, we need to determine the temperature in Kelvin:
T(K) = 52 + 273.15 = 325.15 K

Now we can use the osmotic pressure formula, which is:
Π = n/V * R * T

where Π is the osmotic pressure, n/V is the molarity, R is the ideal gas constant (0.08206 L•atm/K•mol), and T is the temperature in Kelvin.

Π = (0.636 mol/L) * (0.08206 L•atm/K•mol) * (325.15 K) = 16.845 atm

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Answer:

a-it causes friction to increase

Explanation:

Imagine you have a smooth sheet of ice and you slide a smooth box across it. It'll slide petty far because there's not much friction. The two smooth surfaces aren't "grabbing" each other very much.

Now try to slide that same box over gravel. It's not going to go nearly as far. It gets caught by all the little bits of rock sticking up and falls into the divots.

Another example would be to think of sliding two smooth pieces of paper across each other as opposed to trying to slide a set of velcro the same way.

Whenever you have to answer questions about conceptual friction, it helps to picture it big and in real world examples!

Answer:

Changing states of matter and energy

A block of ice is solid water. When heat (a form of energy) is added, the ice melts into liquid water. ... Continue to cool the water (by removing heat), and it becomes solid ice. This is its freezing point.

Answer:

It is the wettest layer of the atmosphere.It extends upto 10km upward from sea level.

Answer:

23.8g

Explanation :

Convert 2.0M into mol using mol= concentration x volume

2.0M x 0.1L (convert 100mL to L since the units for M is mol/L)

= 0.2 mol

We can now find grams by using the molar mass of KBr

=119.023 g/mol (Found online) webqc.org

but can be be calculated by using the molecular weight of K and Br found on the periodic table

We can now calculate the grams by using grams=mol x molar mass

119.023g/mol x 0.2mol

= 23.8046 g

=23.8g (rounded to 1decimal place)

This can be solved according to Le C ha.tellors principle

So

Here to increase NO_2

We need to increase the temperature or increase the concentrations of reactants

The addition of N₂O₄(g) to the system would result in an increase of nitrogen dioxide, NO₂.

The balanced equation provided shows the equilibrium between nitrogen dioxide (NO₂) and dinitrogen tetroxide (N₂O₄). According to Le Chatelier's principle, a change in conditions will cause the system to shift in a way that opposes the change. In this case, if N₂O₄ is added to the system, the equilibrium will shift to the right to consume the added N₂O₄ and produce more NO₂.

Based on the given information, the enthalpy change (AH°) for the reaction is 58 kJ. This indicates that the forward reaction (from N₂O₄ to 2NO₂) is endothermic, meaning it requires heat to proceed. Adding N₂O₄ to the system will provide more reactant molecules, increasing the concentration of N₂O₄ and causing the equilibrium to shift towards the products (more NO₂) to minimize the effect of the added N₂O₄.

Therefore, the addition of N₂O₄ to the system will result in an increase in nitrogen dioxide, NO₂, as the equilibrium shifts to the right to restore equilibrium.

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Answer:

One calorie is equivalent to 4.18joules

Explanation:

\(2.25mol \times \frac{22.4lit}{1mol} = 50.4 lit o2 \)

Answer:

tri-

Explanation:

Examples could be Tri-angle, Tri-cycle, Tri-ceratops

Answer:

tridiminotetracycleonmoon

Answer:

B?

Explanation:

okay so honestly i think its b, but dont get me wrong, im not smart

Answer:

Used as rocket fuel, is a fertilizer ingredient, used in cooking, used to provide lighting, and used in production of other compounds

Explanation:

Hope this helps!!!

Answer:D.

Explanation:

Answer:

Look in explanation.

Explanation:

Mendeleev has ordered the elements based on increasing atomic mass, he has skipped some elements but assumed that they existed and managed to find the atomic mass of the "unknown" elements.

Mendeleev corrected some elements' known atomic masses and used the patterns in his table to anticipate the properties of elements he thought must exist but had yet to be discovered. To depict those unknown elements, he left blank spaces in his chart.

The periodic table is a tabular array of chemical elements organized by atomic number, beginning with hydrogen and progressing to oganesson, which has the highest atomic number.

An element's atomic number is the number of protons in the nucleus of an atom of that element.

Mendeleev adjusted the recognized atomic masses of certain elements and utilized the patterns in his chart to predict the composition of the sample he assumed must reside but that had yet to be unearthed.

He left blank spaces in his chart to represent those unknown elements.

Thus, this way, he predicted their atomic weights and chemical properties.

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Answer:

Molarity=number of moles÷volume(L)

As the first five elements in group 14 are considered in order from top to bottom, there are changes in both the electronegativity values and atomic radii changes.

The columns of the periodic table that contain elements with the same number of valence electrons are referred to as groups. The atomic size of the elements grows as one moves from top to bottom in the 14th group of the periodic table, while electronegativity drops. All elements will have an equal number of electrons in their initial shell and their outermost shell. Thus, changes in atomic radii and electronegativity levels.

Further, The group 14 elements exhibit the periodic table's broadest variation of the chemical behaviour of any group. In general, the electronegativity falls as we advance down the group. Ionization energies drop as atomic radii rise within the group. Down the group, the metallic characteristics also get stronger.

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Williams Field experiences short, chilly summers, lengthy, chilly, snowy, windy winters, with seasonal partial cloudiness. The average annual temperature ranges from -20°F to 32°F, with occasional exceptions when it falls below -32°F or rises beyond 37°F.

Climatic conditions at Williams Field

From November 23 to February 7 is the warm season, which lasts 2.5 months and has an average daily high temperature of more than 24°F. Williams Field experiences its warmest weather in January, with an average high temperature of 31°F and low temperature of 23°F.

The average daily high temperature during the 5.3-month cold season, which runs from April 19 to September 28, is below -2°F. With an average low of -20°F and a high of -10°F, August is the coldest month of the year at Williams Field.

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Answer:

most likely water

Explanation:

most likely it is water, however pressure plays a role, if you are at sea level the boiling point of water is 100°C but if you are on Mt. Everest it is 71°C, assuming she is slightly above sea level it is water.

Carbon cycles through the biosphere through two major processes: photosynthesis and aerobic respiration.

The flow of carbon among living organisms is essential for life on Earth. The two primary mechanisms through which carbon cycles through the biosphere are photosynthesis and aerobic respiration.

Photosynthesis occurs in plants and other autotrophic organisms, allowing them to generate energy from sunlight. They obtain energy from the sun, carbon dioxide (CO2), and water molecules during this process. This results in the creation of glucose and oxygen (O2). This glucose is the building block for other organic materials.

Aerobic respiration, on the other hand, is a process that occurs in plants, animals, and other organisms. During this process, organisms use oxygen (O2) to metabolize organic matter and release carbon dioxide (CO2) as a waste product. This CO2 is then used by plants and other autotrophic organisms to produce glucose through photosynthesis.

The carbon cycle has a vital role in controlling the Earth's temperature, supporting plant growth, and maintaining ecological balance.So, the answer to the question is option E, photosynthesis and aerobic respiration.

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There are approximately 9.03 × 10²³ particles in 1.5 moles of Beryllium (Be).

Beryllium is chemical element with the symbol as Be and atomic number as 4.

Avogadro's number is defined as number of particles (atoms or molecules) in one mole of a substance. It is approximately equal to 6.02 × 10²³.

To find the number of particles in 1.5 moles of Beryllium (Be), we can use  following formula:

Number of particles = moles × Avogadro's number

Number of particles = 1.5 moles × 6.02 × 10²³ particles/mole

Number of particles = 9.03 × 10²³ particles

Therefore, there are approximately 9.03 × 10²³ particles in 1.5 moles of Beryllium (Be).

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Answer:

Yes, that is correct.

Explanation:

The thing to remember about a heterogeneous equilibrium, which as you know involves substances in more than one phase, is that changing the amount of a solid will not affect the position of the equilibrium.

The same can be said for a pure liquid, with the mention here that the solutions in question must be rather dilute to begin with.

For your given equilibrium reaction

NH

4

Cl

(s]

⇌

NH

3(g]

+

HCl

(g]

adding more ammonium chloride,

NH

4

Cl

, will not affect the position of the equilibrium. This is why the concentration of the solid is not included in the expressions for the two equilibrium constants

K

c

and

K

p

, which for this equilibrium will take the form

K

c

=

concentrations



[

NH

3

]

⋅

[

HCl

]

and

K

p

=

partial pressures



(

N

H

3

)

⋅

(

H

C

l

)

Now, without going into detail about this, the reason for why solids do not affect chemical equilibria can be traced back to their chemical activity.

In simple terms, chemical activity is a measure of how the concentration of a substance under some specific conditions compares with the concentration of that substance under standard conditions.

So, if a substance has the same concentration (you'll sometimes see this referred to as molar density) at some given conditions and at standard conditions, then its chemical activity is equal to

1

.

Excluding extreme changes in pressure and temperature, solids will always have the same concentration.

In your example, for a given temperature, the partial pressures and concentrations of the products will not depend on the amount of ammonium chloride present.

Once the equilibrium is established, adding or removing ammonium chloride will not change its chemical activity, i.e. its concentration, so the position of the equilibrium remains unchanged.