URGENT which statement describes a chemical property of hydorgen gas

1. Hydrogen gas is colorless
2. Hydrogen gas burns in the air
3.Hydrogen gas has a density of .00000009 gcm3
4. Hydrogen gas has a boiling point of 20k at standard pressure

Answer:

Explanation:

           2C₈H₁₈ + 25O₂    →  16CO₂   +  18H₂O

The reaction above is a typical combustion reaction which are very common with hydrocarbons. Combustion occurs in the presence of oxygen to product carbon dioxide and water. The purpose of this reaction is to transform chemical energy into useful heat energy. Most times, the oxygen used is always in excess of the hydrocarbon reacting with it.

The balanced equation 2C8H18 + 25O2 → 16CO2 + 18H2O represents a combustion reaction where the octane fuel reacts with oxygen to produce carbon dioxide and water.

The type of chemical reaction given by the balanced equation 2C8H18 + 25O2 → 16CO2 + 18H2O is a combustion reaction.

In a combustion reaction, a substance combines with oxygen to produce carbon dioxide and water vapor. In this case, the octane fuel (C8H18) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The balanced equation shows the stoichiometric ratio of all the reactants and products.

This type of reaction is commonly seen in the burning of fossil fuels, such as gasoline, where a hydrocarbon combines with oxygen to release energy.

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Page 1  

1: The grass

2: The grasshopper

3: The frog

4: The snake

5: The eagle

Page: 2

The answer is the 2nd one

Page: 3

The owl would because its at the end it would have almost no more sun energy left in whatever it eats.

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Grass, Grass Hopper, Frog, Snake, then Hawk.

For the food web question, it would be the third option because most organisms eat more than one thing.

The original source of energy in most ecosystems is the sun.

The owl would receive the least amount of energy because each level of the food chain only gains 10% of the organisms energy.

Answer : A chemical formula usually represents the chemical species involved in a chemical reaction. It gives a clear information about the chemical proportions of atoms present in an chemical compound.

This chemical formula usually employs the use of chemical element symbols, numbers, etc.

Also, sometimes other symbols are also used like parentheses, dashes, brackets, commas and plus (+) or minus (−) signs.

In the given question [tex]2H_{2}O[/tex] where 2 represents the number of hydrogen atoms present in that chemical species (water molecule), The number of oxygen atom is one because it doesn't  has any number before it.

The subscript [tex]H_{2}[/tex] represents the valency of hydrogen, which is 2 here. In all if we have to calculate the total number of hydrogen in this water molecule which is 4 because 2 X 2=4; this is because 2 hydrogen is multiplied with 2 valency of hydrogen.

The answer is:

Coefficient; how many water molecules there are.

The answer is; D,

Because these rocks cool slowly, the rocks are able to form large crystals hence giving the rock a coarse texture. These crystals are big enough to be viewed with the unaided eye. The opposite is extrusive rocks that form on the surface of the earth. These cool rapidly and form fine-grained textured rocks because of the small crystals formed during the rapid cooling process.

Final answer:

Large masses of magma that cool very slowly beneath Earth's surface form igneous rocks with a coarse-grained texture, known as intrusive or plutonic rocks, such as granite.

Explanation:

When large masses of magma solidify very slowly far below Earth's surface, they form igneous rocks that have a coarse-grained texture. This slow cooling process allows large mineral crystals to grow, making them visible to the eye. These rocks are known as intrusive or plutonic igneous rocks, such as granite, which is characterized by a proliferation of light-colored minerals in a coarse-grained matrix. In contrast, rapid cooling of magma at or near the surface leads to fine-grained or glassy textures, typical of volcanic or extrusive igneous rocks, like basalt and obsidian.

In summary, the relationship between cooling rates and the grain size of minerals within igneous rocks is a key factor in their classification and subsequent geological interpretation. The development of these textures, whether coarse or fine, reflects the cooling history and mineral composition of the magma from which they are formed. Option D

Answer: 1,360.776 grams

Explanation: given that a recipe/batch

requires 1 pound of butter

3 pounds would require x

Crosss multiplying we have

X=3 pounds

Converting pound to grams

1 pound =453.592grams

3pound =x grams

Xgrams =453.592*3

X=1,360.776 grams

Hey there!:

The reaction is as follows:

N2(g)+ 3 H2(g) ⇌ 2 NH3(g)

At equilibrium, the concentrations of the different species are as follows.:

[NH3] = 0.105 M

[N2] = 1.1 M

[H2] = 1.50 M

The equilibrium constant for the reaction is given as follows:

Keq = [NH3]² / [N2] [H2]³

Keq = (0.105)² / [1.1] [1.50]³

Keq = 0.00296 or 0.0030

The equilibrium constant for the reaction at this temperature is 0.0030.

Hope that helps!

Answer:

A

Explanation:

Answer:

The correct answer is forms droplets

Hey there!

weak acid = HA

is titrated with NaOH

then :

V = 23.25 mL of weak acid

V = 50 mL base, M = 0.1 M base

pH= 10.50

find original solution of acid :

mmol of base initially = MV = 0.1*50 = 5

mmol of acid added = let it be "x"

After addition  :

mmol of base left = 5-x

from pH  :

pOH = 14-pH = 14-10.50 = 3.5

[OH-] = 10^-pOH = 10^-3.5 = 0.0003162 M left

V total = 23.25 + 50 =  73.25mL

mmol of OH- left = MV = 73.25*0.0003162 = 0.023161

Then  :

mmol of acid added = (5-0.023161) = 4.976839

mmol of acid added was = 4.976839

[HA] = mmol of aid/Vadded

= 4.976839 / 23.25 = 0.21405 M

[ HA ] = 0.21405 M

Hope that helps!

The likely irreversible effect on the ecosystem from cutting down sections of the forest to build new homes is a decline in the deer population.

If humans cut down a few sections in the middle of the forest to build new homes, the likely effect on the ecosystem that could be irreversible is that there will be fewer deer. When their habitat is destroyed, deer may lose their food sources and shelter, leading to a decline in their population. This can have cascading effects on the entire ecosystem, affecting other organisms that depend on deer for food or as predators.

Final answer:

The irreversible effect of cutting down sections of forest for home construction is likely the extinction of certain species, such as wolves, due to habitat fragmentation and loss.(Option B)

Explanation:

If humans cut down a few sections in the middle of the forest to build new homes, a likely irreversible effect on the ecosystem could be that the wolves could die out. Deforestation leads to habitat loss, which not only impacts individual species such as wolves, who may lose their prey and shelter but also triggers a cascade of effects on the biodiversity and the food web.

The drastic reduction in the population of a species, like certain species of deer due to hunting, can have far-reaching consequences on the ecosystem, altering predator-prey relationships and leading to potential species extinction. Large predators such as wolves are particularly vulnerable when their territories and prey populations become fragmented and diminished. Furthermore, habitat destruction is a primary driver of biodiversity loss worldwide, and when it occurs, the changes can be profound and permanent, given that ecosystems take centuries or longer to naturally restore themselves, if at all.

Erosion is the process in which rocks are transported from one location to another. Not to be confused with weathering.

firstly we need to calculate the number of moles of 34.0 g CO.

mole = mass/relative molecular mass = 34/(12+16) = 1.214 mol

CO : CO2 = 2 : 2 = 1 : 1

so that number of moles of CO2 = number of moles of CO = 1.21 mol

then use the number of moles to calculate the mass

mass = mole * relative molecular mass = 1.21 * 44 = 53.4 g

so choose A

The stoichiometric principle allows us to convert the given grams of CO into grams of CO2 using the balanced equation and molar masses. This conversion process yields 53.2 grams CO2. The closest answer according to the choices given is 53.4 g CO2 (option a).

This problem is a stoichiometry problem in Chemistry. The balanced equation gives us a molar ratio of 2:2 (CO to CO2). First, let's convert the grams of CO to moles using the molar mass of CO (CO = 28 g/mol). Then, we multiply the moles of CO by the molar ratio to get moles of CO2. Last, we convert the moles of CO2 to grams of CO2 using the molar mass of CO2 (CO2 = 44 g/mol).

The final answer is 53.2 g CO2, but since the numbers in the answer choices are nor exactly accurate, the closest answer will be 53.4 g CO2 (Option a).

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Explanation:

Funding from the government greatly affects the scientific research as a research can take number of years to complete. During this time period lot of financial support is required as there might be lot of expensive chemicals or substance that the scientist requires for his research.

So, for an individual it is not possible to continue his research without any financial support or huge bank balance.

Also, government can provide better labs and other resources like good equipments, costly or rarely available chemicals or compounds etc.

There are so many diseases for whom there are no medicines. So, with the help of government funding lots of other medicines can be discovered for the benefit of people and development of nation.  

Answer:

Scientists have to follow governmental rules made to protect people.

Explanation:

Answer:

The correct answer is in the presence of a base.

Explanation:

Phenolphthalein is a pH indicator, which is generally colorless, however, it changes from pink to purple when encounters with the alkaline solutions. The compound phenolphthalein functions in a distinct way as it is colorless naturally, however, it turns from pink to dark pinkish color in alkaline solutions. Throughout the range of acidic pH levels, the compound stays colorless, however, it starts to turn pink at the pH of 8.2, that is, basic, and goes towards the bright purple color in stronger alkalines.

A 20 L sample of the gas contains 8.3 mol N₂.

According to Avogadro’s Law, if p and T are constant

V₂/V₁ = n₂/n₁

n₂ = n₁ × V₂/V₁

___________

n₁ = 0.5 mol; V₁ = 1.2 L

n₂ = ?;           V₂ = 20 L

∴n₂ = 0.5 mol × (20 L/1.2 L) = 8.3 mol

Answer:- Iron block final temperature is 64 degree C and copper block final temperature is 76 degree C.

Solution:- These problems are based on the formula:

[tex]q=mC_s\Delta T[/tex]

where, q is the heat energy, m is mass, [tex]C_s[/tex] is specific heat and [tex]\Delta T[/tex] is the change in temperature.

mass of iron is given as 1.1 kg. We need to convert it to grams:

[tex]1.1kg(\frac{1000g}{1kg})[/tex]  = 1100 g

q is 13 kJ, let's convert it to J:

[tex]13kJ(\frac{1000J}{1kJ})[/tex]  = 13000 J

[tex]C_s[/tex] of iron is [tex]\frac{0.450J}{g.^0C}[/tex]

Let's calculate change in temperature for iron.

[tex]\Delta T=\frac{13000J}{1100g*\frac{0.450J}{g.^0C}}[/tex]

[tex]\Delta T=26 ^0C[/tex]

Since, [tex]\Delta T[/tex] = final temperature - initial temperature

26 = final temperature - 38

final temperature = 26 + 38 = 64 degree C

So, The final temperature of iron block would be 64 degree C.

Let's do the same calculations for copper block, it's mass is 890 g and specific heat is [tex]\frac{0.385J}{g.^0C}[/tex] .

[tex]\Delta T=\frac{13000J}{890g*\frac{0.385J}{g.^0C}}[/tex]

[tex]\Delta T=38 ^0C[/tex]

Now, calculations for final temperature:

[tex]\Delta T[/tex] = final temperature - initial temperature

38 = final temperature - 38

final temperature = 38 + 38 = 76 degree C

So, the final temperature of copper block is 76 degree C.

The final temperature of the iron block will be 64.1 °C,  

The final temperature of the copper pellet will be 76.0 °C after 13 kJ of heat is transferred to each.

This assumes no heat loss to the surroundings.

To solve this, we use the formula:

q = m * Cs * ΔT

Where q is the heat transferred, m is the mass, Cs is the specific heat capacity, and ΔT is the change in temperature.

For the iron block:

Rearranging the formula to solve for ΔT:

ΔT = q / (m * Cs)

ΔT = 13,000 J / (1100 g * 0.450 J/g°C) ≈ 26.1 °C

The initial temperature is 38 °C, so the final temperature will be:

38 °C + 26.1 °C = 64.1 °C

For the copper pellet:

Similarly, solving for ΔT:

ΔT = q / (m * Cs)

ΔT = 13,000 J / (890 g * 0.385 J/g°C) ≈ 38.0 °C

The initial temperature is 38 °C, so the final temperature will be:

38 °C + 38.0 °C = 76.0 °C

physical properties for a bar of soap: hardness and color

physical properties for a book: texture and size

physical properties for tooth past: cohesiveness and taste

Answer: The correct answer is:

1. Metal pot: Hardness, fusibility

2. Glass cup: Transparent, resistant

3. Sheet of paper: White, porous

Explanation:

A physical property is one that is based primarily on the structure of the object, substance or matter, which is visible and measurable.

We can define the physical properties of an object through observation and measurement. For example, the physical properties of a wooden cube would be: dense, solid, square, wooden, organic, non-malleable, etc.

Each type of electromagnetic radiation have been matched to their descriptions as follows:

Ultraviolet light A) Given off by very hot objects, such as the sun

Gamma rays B) Given off by radioactive substances  

Microwaves C) Used in radar and to heat food

X‒rays D) Used in the medical field to see bone structure

Gamma rays - B) Given off by radioactive substances

Microwaves - C) Used in radar and to heat food

Ultraviolet light - A) Given off by very hot objects, such as the sun

X-rays - D) Used in the medical field to see bone structure

Gamma rays are a type of electromagnetic radiation emitted by radioactive substances. They have high energy and can penetrate deep into materials, making them useful in various applications such as medical imaging, cancer treatment, and industrial inspections.

Microwaves are a type of electromagnetic radiation used in radar systems for communication and navigation. They are also used in household microwave ovens to heat food by causing water molecules in the food to vibrate and generate heat.

Ultraviolet light is electromagnetic radiation with higher energy and shorter wavelengths than visible light. It is emitted by very hot objects, such as the sun. Ultraviolet light has various effects on living organisms and can cause tanning, sunburn, and vitamin D production in humans.

X-rays are a type of electromagnetic radiation with higher energy and shorter wavelengths than ultraviolet light. They are commonly used in the medical field for imaging and diagnostics, allowing doctors to see the internal structures of the body, including bones and soft tissues.

Each type of electromagnetic radiation has unique properties and applications, making them valuable in different fields of science, technology, and medicine. Understanding these different types of radiation is essential for their safe and effective use in various applications.

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Final answer:

The inflationary model proposes that the universe underwent rapid expansion, known as inflation, shortly after the Big Bang, explaining its flatness and uniformity. The model accounts for the uniform CMB temperature and expounds on the formation of structures within the early universe, including galaxies from concentrated regions of matter.

Explanation:

The Inflationary Hypothesis

Physicists have developed a theory known as the inflationary model to explain certain characteristics of the universe, such as its flatness and uniformity. This hypothesis suggests that shortly after the Big Bang, before the emission of the Cosmic Microwave Background (CMB), the universe underwent a period of incredibly rapid expansion. This period, known as inflation, lasted between about 10-35 and 10-33 seconds after the Big Bang, during which the scale of the universe increased exponentially by a factor of about 1050. These inflationary models adjust for the uniform temperature observed across the CMB and the density of the universe being so close to the critical density. They also help explain how the early hot, dense state of the universe resulted in the large-scale structures we see today, where the concentrated matter eventually formed galaxies.

Formation of Structure in the Early Universe

Theorists suggest that in the early universe, a uniform hot 'soup' of particles vibrated, much like sound waves. These vibrations could have created regions of higher density, which, upon cooling, resulted in the 'frozen in' concentrations of matter from which galaxies eventually formed. The Big Bang model is supported by the isotropic nature and the expansion of the universe, along with CMB evidence. Overall, the model of an inflationary universe fills in the gaps left by the traditional Big Bang model and provides a unified picture of how the early universe evolved, guided by the principles of grand unified theories (GUTs).

The rows are the one line of elements that goes from left to right horizontally. A column is a line of elements that goes vertically.

1. I think its B but im not sure imma check again

2. Its D fo sho

One

Let's start by stating what we know is wrong. Equilibrium is achieved when the reactants and products have a stable concentration. That makes D incorrect. Equilibrium is not established until about the 6th or 7th second.

The fact that you get any products at all means that the reactants will become products.  Just who is favored has to be looked at very carefully. The products start very near 0. They go up until their concentration at equilibrium. When the reach equilibrium, the products have increased to 17. The reactants have dropped from 40 to 27. By a narrow margin, I would say the products are favored.

C is incorrect. There are still reactants left.  

E is incorrect. the reactants started out with a concentration of 40. The reaction is not instantaneous.  The concentration was highest at 40 or right at the beginning. This assumes that the reactants were mixed and the products were produced and the water/liquid amount has not changed.

B is incorrect. The concentration of the reactants is higher at equilibrium.

A is wrong. It is product favored.

I'm getting none of the above.

Problem Two

AgBr is insoluble (very). You'd have to work very hard to get them to separate into their elemental form. Just putting AgBr in water isn't enough. Lots of heat and lots of electricity are needed to get the elemental form.

I suppose you should pick B. Mass must be preserved. But if you balanced the equation, it would work with heat and electricity.

Answer:

if the object is denser then the substance, it will sink, the less dense the object is then it will float

Explanation:

i got it right in my test. :) have a good day

Answer:

c fluorine

Explanation:

the answer is A......

it is supported by practical evidence and examples. this is the answer because he tried and tested many different ways to see what would happen so he is happy with the conclusion that what he tested is what he gets.

The correct answer is A.

In precision farming, solutions or alternate actions are determined by the Decision Support System (DSS) principle of data-driven decision making, using real-time data from sensors and other sources to optimize farming practices.

In precision farming, the Decision Support System (DSS) principle that determines solutions or alternative actions is mainly guided by the principle of data-driven decision making. This involves the collection, analysis, and interpretation of real-time data gathered from various sources such as sensors, satellite images, and drones. The goal is to make informed decisions that optimize resources, maximize yields, and reduce environmental impact.

Data analytics and algorithms help farmers predict outcomes based on current conditions. For instance, a DSS might suggest the optimal amount of water and fertilizer needed for a specific crop, considering the weather forecasts, soil conditions, and plant health. By integrating with Geographic Information Systems (GIS), the DSS helps to create variable-rate application maps that facilitate the precise distribution of inputs in the farm field.

Overall, the principle of leveraging accurate and up-to-date information to inform farming practices is central to precision agriculture and empowers farmers to tailor their strategies to the specific needs of each area within their fields.

[tex]\boxed{\text{C. 1-hexene}}[/tex] is an unsaturated hydrocarbon.

Further Explanation:

Hydrocarbons:

The organic compounds consisting of hydrogen and carbon atoms alone are called hydrocarbons. Such compounds can be aromatic, aliphatic, linear, branched or cyclic. Aromatic hydrocarbons, alkanes, cycloalkanes are different types of hydrocarbons.

Types of hydrocarbons:

(I) Saturated hydrocarbons

These are variety of hydrocarbons that contain only single bonds in them and are the simplest hydrocarbons. Saturated hydrocarbons have the general formula of [tex]\text{C}_{\text{n}}\text{H}_{\text{2n+2}}[/tex]  in which n indicates the number of carbon atoms present in it. Examples of saturated hydrocarbons are methane, ethane, butane and propane.

(II) Unsaturated hydrocarbons

The type of hydrocarbons that has multiple bonds in them are known as unsaturated hydrocarbons. Multiple bonds can be either double or triple bonds. Alkenes are those unsaturated hydrocarbons consisting of double bonds in them. For example, ethene, propene, and pentene are alkenes. Alkynes refer to unsaturated hydrocarbons with triple bonds in them. Ethyne and propyne are examples of alkynes. Alkenes are represented by general formula,  [tex]\text{C}_{\text{n}}\text{H}_{\text{2n}}[/tex] while alkynes are represented by general formula of [tex]\text{C}_{\text{n}}\text{H}_{\text{2n-2}}[/tex] .

Alkanes use ‘ane’ as suffix in their naming. Alkenes use ‘ene’ as suffix while ‘yne’ is used in naming of alkynes.

Since 2-methylheptane, 3-ethylpentane and cyclopentane have suffix ‘ane’ in their names and are tered as saturated class of hydrocarbons called alkanes. But 1-hexene has suffix ‘ene’, indicating that it belongs to unsaturated hydrocarbons called alkenes. Therefore 1-hexene is an unsaturated hydrocarbon.

Learn more:

1. What is the empirical formula of the compound? https://brainly.com/question/6126420

2. Write the name of the hydrocarbon: https://brainly.com/question/3551546

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Hydrocarbons

Keywords: hydrocarbons, saturated, unsaturated, alkene, alkyne, CnH2n+2, CnH2n, CnH2n-2, double bonds, triple bonds, single bonds, 1-hexene, cyclopentane, 2-methylheptane, 3-ethylpentane.

The compound which is an unsaturated hydrocarbon is 1-hexene.The correct option is C.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.

Organic compounds have single,double or triple bonds due to which the single organic compounds  are saturated while the other two are unsaturated hydrocarbons with suffix '-ene' or '-yne'.

Thus, the correct option is C.

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beryllium, iron,gold most brittle to least :) hop this helped

Answer:

The answer is option 1, Beryllium.

Explanation: