Hi can u help me with this?

Answer:

4.2 gigagrams

Explanation:

kilo = 1,000

giga = 1,000,000,000

milli = .001

Answer:

carbon dioxide

Explanation:

because we breath in oxygen and breath out Carbon

Answer:

i think b

Explanation:

Answer: W + BgCz2 arrow WCz + Bg

2 W + BgCz2 arrow  2 WCz + Bg

Explanation:

Cz has 2 so you balcne the other side of WCz.

Since you Balcanes the Cz you changed the W and you Balcanes the other W on the left side.

Answer:

Tall, Res, Dom

short, RES, RES

Explanation:

Removing B from the system

- Decreases the rate of the reaction. Backward reaction (formation of reactants) is favoured.

Crushing A into a powder

- Increases the rate of reaction. This is because of the increased surface area of A.

Warming the system

- Increases the rate of the reaction. Temperature is proportional to rate of reaction.

Adding more A to the system

- Increases the rate of reaction. Forward reaction (formation of products) is favoured.

Putting the system into an ice bath

- Decreases the rate of reaction. Temperature is proportional to rate of reaction.

Decreasing the pressure of the system

- Decreases the rate of the reaction.

Answer:

5.81×10²² molecules of oxygen.

Explanation:

This a reaction of decomposition:

2KClO₃ →  2KCl + 3O₂

2 moles of potassium chlorate can produce 2 moles of potassium chloride and 3 moles of oxygen.

We determine the amount of salt.

7.89 g. 1mol /122.55g = 0.0644 moles.

If 2 moles of salt, can produce 3 moles of oxygen.

0.0644 moles of salt may produce (0.0644 . 3) /2 = 0.0966 moles.

Let's count the molecules.

1 mol oxygen contains 6.02×10²³ molecules

Then, 0.0966 moles may contain (0.0966 . NA) = 5.81×10²² molecules

H2 and 02​ are the products of this chemical reaction because of the splitting of water molecule.

The products of this chemical reaction are H2 and 02​ because when the water molecule dissociates or splits hydrogen and oxygen molecules are formed. We know that water is produced from the combination of hydrogen and oxygen.

So we can conclude that H2 and 02​ are the products of this chemical reaction because of the splitting of water molecule.

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Answer:

The correct answer is - option C. mechanical work, such as contracting muscles.

Explanation:

Cells perform three major work that can be categorized in chemical work, mechanical work, and transport work. Production of the large molecules is an example of chemical work.

The transport work includes transporting substances across the membrane such as moving the ions across a plasma membrane. Contraction of the muscles and the movements of cilia is mechanical work.

Answer:

The volume of the gas is 89.60

Explanation:

When converting from moles to volume, you would multiply by 22.4 because 1 mole equals 22.4 liters at STP.

So...

4.0 moles * 22.4 liters =

89.60 liters

Answer:

[tex]\boxed {\boxed {\sf 89.6 \ liters}}[/tex]

Explanation:

At STP (standard temperature and pressure), all gases have a volume of 22.4 liters per mole.

[tex]\frac {22.4 \ L }{1 \ mol }[/tex]

Multiply by the given number of moles, 4.0

[tex]4.0 \ mol *\frac {22.4 \ L }{1 \ mol }[/tex]

The moles will cancel out. The 1 in the denominator can be ignored, so this becomes a simple multiplication problem.

[tex]4.0 * {22.4 \ L }=89.6 \ L[/tex]

4.0 moles of a gas at STP have a volume of 89.6 liters.

Answer:

1. 2 H2 1 O2 and 2 H2O

2. 2 THEN 2

3 1 THEN 2

4. 2 THEN 7 THEN 4 THEN 6

5. 1 THEN 1 THEN 1 THEN 2

Explanation:

Answer:

HCI and KOH

Explanation:

HCI + KOH >> H2O + KCI

Answer:

C6H12O6

Explanation:

I attached the method for solving above.

Answer:

Single replacement reaction

Explanation:

It's already balanced so it would just be Mg + H2SO4 --> H2 + MgSO4

The formula for a single replacement reaction is

A + BC --> B + AC

A=Mg

B=H2

C=SO4

Answer:

Yes it is a chemical reaction

Explanation:

The spoiling of the food is a chemical reaction becouse once the food is spoilt it cannot become it's original form again

Answer:

exo means energy is released when delta h is + it is endo and when energy is on the reactants side that is energy introduced so endo as well so when energy shows up on the product side that is the exo one

so it is C as that E is listed as a product therefore released

Explanation:

Answer:

option B is correct

Energy flows between the trophic levels of different food chain

hope it helps

Energy flows between the trophic levels of the different food chains. So the correct option is B.

The trophic level is a step in a nutritive series also called a food chain which is an integral part of an ecosystem. The organisms that are part of a food chain are classified into these energy levels. This classification is on the basis of their feeding behavior.

The first and the lowest level is designated for producers which are the green plants. These plants or the products produced by these plants are consumed by second-level organisms the herbivores, or plant eaters.

They are called primary consumers. At the third level, there are the primary carnivores, which are the meat eaters. These organisms feed on herbivores. They are called secondary consumers. At the fourth level, secondary carnivores are eaten by the primary carnivores.

These categories of levels are not rigid in their definition, as there are many organisms that feed on several trophic levels. For example, some carnivores also feed on plant materials or carrion and are called omnivores, and some herbivores can occasionally eat animal matter.

There is a separate trophic level for the decomposers or the transformers which consist of organisms like bacteria and fungi. These break down dead organisms and waste materials into nutrients usable by the producers.

Therefore the correct option is B.

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Answer:

when the pH increases suddenly in the flask

Explanation:

I think it's right. :)

When the pH increases suddenly in the flask at that point is a base no longer added during a titration.

Titration is a typical quantitative chemical analysis procedure used in laboratories to quantify the concentration of a specified analyte. The titrant or titrator is a reagent that is produced as a standard solution with a known concentration as well as volume.

The pH scale, which originally stood for "potential of hydrogen," is used to describe the acidity as well as basicity of aqueous solutions. The pH of acidic solutions is lower than that of basic as well as alkaline solutions.

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According to the forces of attraction, temperature increase causes number of collisions with enough energy to react increases.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

Its located on North America

Explanation:

The balanced equation of the reaction is given as;

Mg(OH)2 (s) + 2 HBr (aq) → MgBr2 (aq) + 2 H2O (l)

1. How many grams of MgBr2 will be produced from 18.3 grams of HBr?

From the reaction;

2 mol of HBr produces 1 mol of  MgBr2

Converting to masses using;

Mass = Number of moles * Molar mass

Molar mass of HBr = 80.91 g/mol

Molar mass of MgBr2 = 184.113 g/mol

This means;

(2 * 80.91 = 161.82g) of HBr produces (1 * 184.113 = 184.113g) MgBr2

18.3g would produce x

161.82 = 184.113

18.3 = x

x = (184.113 * 18.3 ) / 161.82 = 20.8 g

2. How many moles of H2O will be produced from 18.3 grams of HBr?

Converting the mass to mol;

Number of moles = Mass / Molar mass = 18.3 / 80.91 = 0.226 mol

From the reaction;

2 mol of HBr produces 2 mol of H2O

0.226 mol would produce x

2 =2

0.226 = x

x = 0.226 * 2 / 2 = 0.226 mol

3. How many grams of Mg(OH)2 are needed to completely react with 18.3 grams of HBr?

From the reaction;

2 mol of HBr reacts with 1 mol of Mg(OH)2

18.3g of HBr =  0.226 mol

2 = 1

0.226 = x

x = 0.226 * 1 /2

x = 0.113 mol

total pressure

=77 mmHg+87 mmHg

=164 mmHg

Answer: 164 mm Hg

Explanation: 7 mmHg+87 mmHg

=164 mmHg