What is the pH of a 4.5 x 10^-3M HI solution?
A) 0.1
B) 4.8
C) 3.2
D) 2.4

Answer:

1 mole of any material contains 6.023×1023 elementary particles. Hence, by ratio and proportion, 5.61mol of diatomic hydrogen gas contains 5.61×6.023×1023 hydrogen molecules =3.3789×1024 H2 molecules.

Explanation:

Answer:

[tex]\huge\boxed{\sf C. \ 6}[/tex]

Explanation:

Orbitals:

Types:

There are 4 types of main orbitals.

[tex]\rule[225]{225}{2}[/tex]

Answer:

snow, or freezing rain?

Explanation:

because freezing rain can occur then, but snow is more common.

the amount of energy absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure, is formed.

According to Avogadro's law 1 mole of any gas occupies 22.4 L (dm3) at room temperature and pressure.

So the amount of energy absorbed:

(kJ)E=131∗240/22.4

=1403.6(kJ)

1403.6 kJ is absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure is formed.

Water will move into the cell because of lower concentration of water inside the cell as compared to outside.

Water has a tendency to move across a membrane from a lower osmolarity to a higher osmolarity which means from higher concentration region to the lower concentrated region.

So we can conclude that water will move into the cell due to lower concentration of water inside the cell as compared to outside.

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Answer:

If you're from study island, the answer is D. Water will move out of the cell.

Explanation:

I got it on study island and this was right.

Answer:

Chemicals

Explanation:

Your answer would be chemicals because of you have different inputs you would also have a different output depending.

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Anygays-

Answer:

Chemicals

Explanation:

Different ATCG makes different chemicals.

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Muffin °-°

Answer:

The answer is C

Explanation:

unsaturated hydrocarbons have multiple carbon bonds

Unsaturated alkene  describes the molecule shown below as the atoms are attached by double bonds.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is  solid,liquid , gas consists of atoms . Each atom has a nucleus which is contains  protons and neutrons and shells in which the electrons revolve.

The protons are positively charged particles  and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged particles and hence the atom as a whole is neutral  particle and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not  change the chemical properties of the substances.

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Answer:

A. The mass of reactants is the same as the mass of products

Answer:

so the order is grass, which gets eaten by the grasshopper, which is eaten by the frog, which gets eaten by the snake. grass wpuld be at top, snake at bottom.

Explanation:

hope this helps

In an ecosystem, the first trophic level is for grass followed by , grasshopper,snake and  then frog.

An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by  action of microbes nutrients are released back in to the soil.

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Answer:

The 3 stressers are 1. Adding or removing reactants or products. 2. Changing the total pressure or volume. 3. changing the tempature of the system.

Explanation:

All three of these are stressers that can be applied.

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-Justin:)

Answer:

Natural sources include decomposition, ocean release and respiration. Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal, oil and natural gas.

Explanation:

The mass of Sodium hydroxide which is needed to make 2.500 L of a 2.000 M NaOH solution is 200 grams.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given that, molarity of NaOH = 2M

Volume of NaOH solution = 2.5L

Moles of NaOH will be calculated by using the below equation as:

M = n/V

n = (2)(2.5) = 5 moles

Now we calculate the mass of NaOH of 5 moles as:

W = (5mol)(40g/mol) = 200g

Hence option (4) is correct.

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Answer:

d

Explanation:

Answer:

O 392 g

Explanation:

39.2 grams of oxygen (O2) can be produced.

The concept stoichiometry is used here to determine the grams of oxygen produced. The amount of oxygen produced from the decomposition of 244 grams of potassium chlorate is 96.0 g . The correct option is C.

The stoichiometry is an important concept in chemistry which helps us to use the balanced chemical equation to calculate the amount of reactants and products. Here we make use of the ratios from the balanced equation. It help us to understand how much substance is needed or present.

Here the balanced reaction is:

2 KCIO₃(s) + 2 KCl(s) + 3 O₂(g)

2 moles of KCIO₃ = 2(39 + 35.5 + 3 × 16) = 245 g

3 moles of O₂ = 3 × 2 × 16 = 96 g

245 g KCIO₃ produces 96 g O₂

Therefore 245 g gives 96 × 244/245 = 95.6 g ≈ 96.0 g

Thus the correct option is C.

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Explanation:

distance = speed x time

distance = 10 x 2

distance = 20miles

hope that helps :)

If a cross country runner travels at a speed of 10 mph and he runs for 2 hours, 20miles he will have run at the end of the 2 hours.

Distance is a description of how far apart two things or points are, either numerically or occasionally qualitatively. Distance can be used to describe a length in physics or to an estimate based on other factors in common usage.

The phrase is widely used metaphorically to refer to a measurement of the degree of distinction between two similar items since spatial intelligence is a rich source of implicatures in human understanding.

distance = speed x time

distance = 10 x 2

distance = 20miles

Therefore,  20miles is the distance.

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Answer:

The answer is A. It must have a medium

Explanation:

With out a medium the wave will not travel at all.

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Answer:

this is because the salt may be acidic and also may have oxygen substituent which can lead to rust

During cold winters, the salt present on the roads reacts with the iron and the dew water and results in the formation of the iron oxide as rust.

The rust has been given as the iron oxide compound, that has been formed with the reaction of the water with the iron in the presence of oxygen.

In the winters, there has been the presence of the water in the salt, and the interaction of the salt with the iron to form the iron oxide that is rust.

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Your answer is A. a neutron

A rod, plate, or tube containing a material such as hafnium, boron, etc., used to control the power of a nuclear reactor. By absorbing neutrons, a control rod prevents the neutrons from causing further fissions.

Answer:

A. a neutron

Explanation:

Boron-10 is commonly used as a neutron absorber due to the high neutron cross section of isotope 10B.

hope this helps!

The pH of a solution of sulphuric acid that has hydronium ion concentration is 4.26.

pH of any solution is define as the negative logarithm of the concentration of H⁺ ion present in any solution, i.e.

pH = -log[H⁺]

In the question, it is given that:

Concentration of hydronium ion or H⁺ ion = 5.45×10⁻⁵ M

So, pH will be:
pH = -log(5.45×10⁻⁵)

pH = -(-4.26)

pH = 4.26

Hence required pH is 4.26.

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Answer:

universal law of gravitation

Explanation:

According to Newton's law of gravitation, every particle in universe attracts every other particles with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between their centres!

Consider two particles having masses m1 and m2 and are apart r units, then the gravitational force acting between them is given by

[tex]F = G \cdot \frac{m1\cdot \: m2}{ {r}^{2} } [/tex]

Where G is universal gravitational constant or proportionality constant!!

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The percent yield shows the extent to which the reactants are converetd into products . The limiting reactant is used up in the reaction.

A limiting reactant is the reactant that is in the least amount in the system.  Now;

Number of moles of Fe =  12.21 g/56 g/mol = 0.22 moles

Number of moles of O2 = 13.54 g/32 g/mol = 0.42 moles

Balanced reaction equation;

3Fe(s) + 2 O2(g) = Fe3O4(s)

If 3 moles of Fe reacts with 2 mole of O2

0.22 moles of Fe reacts with  0.22 moles * 2 mole/3 moles = 0.15 moles

Hence, Fe is the limiting reactant

If 3 mole of Fe produces 1 mole of  Fe3O4(s)

 0.22 moles  of O2   produces   0.22 moles * 1 mole/3 moles of  Fe3O4(s) = 0.1073 moles

Mass of  Fe3O4(s) =0.1073 moles  * 232 g/mol =16.9 g

Number of moles of excess reactant = 0.42 moles - 0.15 moles = 0.27 moles

Mass of excess reactant = 0.27 moles * 32 g/mol = 8.64 g

percent yield = 15.88 g/16.9 g * 100/1

= 93.4%

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Answer:

the chemical formula of benzaldehyde is C₇H₆O

Answer:

0.67

Explanation:

Molality is mols of solute over kilograms of solvent
there are 58/174 mols of solute, and 0.5 kg of solvent
(58/174)/0.5=0.6666...
Round to the nearest hundreth to get 0.67

Answer:

Chemical that can be mixed with another chemical to reduce the dangerous of a specific chemichal

Answer:

1. Boron B 13 2 Non-Metal

2. Aluminium Al 13 3 Metal

3. Tin Sn 14 5 Metal

4. Helium He 18 1 Non- Metal

5. Neon Ne 18 2 Non- Metal

6. Calcium Ca 2 4 Metal

7. Francium Fr 1 7 Metal

8. Gold Au 11 6 Metal

Answer:

The correct answer is coats the pathogen exterior so that it is recognized by the host's phagocytes. :)

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