Complete:
If two or more elements or chemical compounds come into contact with one another and there is enough ________________present, a chemical change may take place.

a. When a substance undergoes a chemical change, the chemical ______________of the substance is altered.
b. A chemical change can also be called a chemical _______________.

Answer:

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

Explanation:

Orbitals:

Types:

There are 4 types of main orbitals.

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

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.

Answer: Vanadium

Explanation:

[tex]w = \text{Number of mols} \times \text{Molar mass}=4.8 \times 58.5=280.8~ g[/tex]

We know,

Molar Mass of Sodium= 23 and,

Molar Mass of Chlorine= 35.45

[tex] \therefore \text{Molar Mass of Sodium chloride= 58.44 }\text{g/mol}[/tex]

So, The Molar Mass in Grams=

[tex]58.44 \frac{\text{g}}{ \cancel\text {mol}} \times 4.80 \: \cancel\text{mol} \\ \\ \text{Mass of NaCl }= 280.51\: \text {gram}[/tex]

Answer:

25.7 g

Explanation:

I don't know what to put here hahaha, I hope my answer helps you ^^

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:

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:

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:

trimethyl nonane

Explanation:

Answer:

Chemicals

Explanation:

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

I hope it helps! Have a great day!

Anygays-

Answer:

Chemicals

Explanation:

Different ATCG makes different chemicals.

I hope it helps! Have a great day!

Muffin °-°

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

For a volume of 27,000 L to a pressure of 0.82 atm at 25 °C, the amount of N2 is required  is mathematically given as

n=1.1*10^{-3}mole

Generally, the equation for the ideal gas  is mathematically given as

PV=nRT

Therefore

[tex]n=\frac{PV}{RT}\\\\n=\frac{0.980*2700}{0.0821*298}[/tex]

n=1.1*10^{-3}mole

In conclusion, the amount of N2 is required is

n=1.1*10^{-3}mole

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Answer:

1.5 mol/L

Explanation:

molarity = moles/litres

NaOH = 23 + 16 + 1 = 40 g/mol

[tex] ? \: mol \: naoh \: = 30 \: g \: naoh \: \times \\ \\ \frac{1 \: mol \: naoh}{40 \: g \: naoh} = 0.75 \: mol \: naoh[/tex]

molarity = 0.75 mol NaOH ÷ 0.5 L = 1.5 mol/L NaOH

Answer:

B.fin position

C.colour of stripes

The number of moles of silver oxide (I) needed to produce 4 moles of silver is 2 moles

From the question, we are to determine the number of moles of silver oxide (I) needed to produce 4 moles of silver

First, we will write the balaced chemical equation for the decomposition of silver oxide (I)

2Ag₂O(s) → 4Ag(s) + O₂(g)

This means, 2 moles of silver oxide (I) [Ag₂O] decomposes to give 4 moles of silver and 1 mole of oxygen gas.

From the balanced chemical equation, it is easy to deduce the number of moles of silver oxide (I) that would give 4 moles of silver.

Hence, the number of moles of silver oxide (I) needed to produce 4 moles of silver is 2 moles

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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:

Physical :)

Explanation:

Skin works as a shield to the outside elements and does a good job of keeping the bad stuff out. :)

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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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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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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!

Answer:

the chemical formula of benzaldehyde is C₇H₆O

In the Lewis symbol for a fluorine atom, there are 4 paired and 1 unpaired electrons.

However, paired electrons simply means are 2 electrons occupying the same orbital in an atom or molecule of a substance

On the other end, unpaired electron is a single electron that occupies an orbital of an atom.

An atom is the smallest part of an element which can take part in a chemical reaction.

Some atoms of elements are:

In conclusion, in the Lewis symbol for a fluorine atom, there are 4 paired and 1 unpaired electrons.

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Answer: 6, 1

Explanation:

Answer:

snow, or freezing rain?

Explanation:

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

1129.9 grams of rock salt, NaCl should be added to a 3.78 kg of ice to get the temperature to drop to -19 °C.

The mass of rock salt required to lower the temperature of ice by 19 °C is determined using the Blagden's Law given below:

where;

The van't hoff factor for NaCl, i = 2

Kf for water/ice = 1.86 °C kg/mol

molalityof NaCl = (mass/molar massl) / kg of ice

The mass of NaCl is derived as follows:

molar mass of NaCl = 58.5

mass of ice = 3.78 kg

Let molality of NaCl = X

ΔT = 19 °C

Inputting the values above in the equation of Blagden law:

19 = 2 x 1.86 °C kg/mol x X

X = 5.11 mol/kg

Then, the mass of NaCl will be;

mass of NaCl = 5.11 × 3.78 × 58.5

mass of NaCl = 1129.9 g

Therefore, 1129.9 grams of rock salt, NaCl should be added to a 3.78 kg of ice to get the temperature to drop to -19 °C.

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Answer:

i think 50C

Explanation:

It only makes since cause if its 4.43 and u want the volume to be 3.13 it has to me 50C

Use Charles law

[tex]\\ \rm\rightarrowtail V_1T_2=V_2T_1[/tex]

[tex]\\ \rm\rightarrowtail 4.43T_2=(70)(3.13)[/tex]

[tex]\\ \rm\rightarrowtail 4.43T_2=219.1[/tex]

[tex]\\ \rm\rightarrowtail T_2=49.4°C[/tex]

Answer:

Molarity=number of moles÷volume(L)