Read the description and find the vocabulary term that matches it.
Description
15.
16.
17.
18.
19.
20.
21.
22.
23.
study of processes that take place in
living organisms
systematic approach to solving a
scientific problem
variable that you change during an
experiment
the study of matter and how it reacts
deals with mechanism, rate, and
energy transfer
proposed explanation for an observation
well-tested explanation for a broad set
of observations.
concise statement summarizing results
of many experiments
variable that is observed during an
Vocabulary Term
a. theory
b. chemistry
c. scientific law
d. dependent or responding variable
e. scientific method
f. biochemistry
g. physical chemistry
h. independent or manipulated variable
i. hypohthesis

Answer:

First of all take separatory funnel.

Add the mixture of compounds into it.

Pour Water into it.

Add NaOH base. This will result in following reaction.

           CH₃CH₂CH₂COOH + NaOH  → CH₃CH₂CH₂COONa + H₂O

The resulting salt (CH₃CH₂CH₂COONa) is is soluble in water.

The water is the bottom layer (more density) and contains sodium butyrate.

Pour out the water from separatory funnel.

The organic layer (hexane) is left behind.

Now, take the aquous layer and neutralize it using HCl.

Once, neutralized remove the water.

Answer:

540% according to an article I read on BBC

Explanation:

A molecule of ethanol (C2H6O) is composed of 9 atoms.

Breaking down the molecular formula: C2H6O

There are 2 carbon atoms (C2).

There are 6 hydrogen atoms (H6).

There is 1 oxygen atom (O).

In total, the molecule of ethanol contains 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom, summing up to a total of 9 atoms.

A molecule of ethanol (C2H6O) consists of 2 carbon atoms (C), 6 hydrogen atoms (H), and 1 oxygen atom (O). Therefore, there are a total of 2 + 6 + 1 = 9 atoms in a molecule of ethanol.

Adding up the individual atoms, we get a total of 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom, which sum up to 9 atoms in total.

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Answer:

light

Explanation:

Have a nice day

Answer:

light

Explanation:

Isotopes undergo radioactive decay because thermodynamics generally governs the situation. Every atom strives to have the greatest degree of stability. When the number of protons and neutrons in the atomic nucleus is out of balance, instability results in radioactive decay. In essence, the nucleus contains too much energy to keep all the nucleons together.

Radioactive decay a the spontaneous process through which an unstable atomic nucleus breaks into smaller, more stable fragments.

Three Types of Radioactive Decay:

Alpha Decay:

       When an alpha particle basically a helium nucleus with two protons and two neutrons is ejected, the parent's atomic number and mass number are reduced by two and four, respectively.

Beta Decay:

      A stream of electrons from the parent, known as beta particles, is released during beta decay, and a neutron in the nucleus is changed into a proton. The new nucleus has the same mass number, but an additional atomic number of one.

Gamma Decay:

        The atomic nucleus releases extra energy during gamma decay in the form of high-energy photons (electromagnetic radiation). The resultant nucleus takes on a more stable energy state while maintaining the same atomic number and mass number.

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Answer:

To calculate the mass of the sample, we can use the formula:

mass = density x volume

Given that the density of pure silicon is 2.34 g/cm^3 and the volume is 450 mL, we can plug in these values:

mass = 2.34 g/cm^3 x 450 mL

Before we can multiply, we need to convert mL to cm^3 since the units need to match:

1 mL = 1 cm^3

So:

mass = 2.34 g/cm^3 x 450 cm^3

Now we can multiply:

mass = 1053 g

Therefore, the mass of the sample of pure silicon is 1.053 x 10^3 g, or 1.053 kg, with three significant figures.

Explanation:

6H2 + P4 → 4PH3, is a balanced chemical reaction. The sum of the coefficients is 11.

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The volume of bromine that is required to react with 165 liters of chlorine gas is 49.8 L.

(1) volume of chlorine=33.8 liters

Given reaction equation: Br2(g)+Cl2(g) -> 2BCl(g)

In case of gases, molar ratio can be expressed in terms of volume occupied by each gas at constant temperature and pressure.(volume is directly proportional to number of moles of gas).

According to the balanced reaction, moles of bromine =moles of chlorine=33.8 L

Hence volume of bromine required = 33.8 litres

(2)according to given reaction:

2BrF3 (g) -> Br2(g)+3F2(g)

total moles of product =4

reactant=2

Hence ratio of moles of reactant: product=2:4 i.e., 1:2.

so, total volume of product = 2 * volume of reactant(BrF3)=2*24.9L = 49.8 liters

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Answer:

This is not a redox reaction.

Explanation:

A redox reaction is a reaction that involves reduction and oxidation processes. The best way to identify a redox reaction. Changes in the oxidation number f the species indicates that it is a redox reaction.

Na+

Reactant side = +1, Product Side = +1; No change

Cl-

Reactant side = -1, Product Side = -1; No change

Ag+

Reactant side = +1, Product Side = +1; No change

N

Reactant side = +5, Product Side = +5; No change

O

Reactant side = -2, Product Side = -2; No change

There is no change in any of the oxidation numbers, Hence this is not a redox reaction.

Explanation:

The main gases dissolved in purified water are oxygen and nitrogen, carbon dioxide, plus traces of inert gases, all in equilibrium with ambient air.

Answer:

Explanation:

I am sorry but the graph is not given

To calculate the molarity of a solution, we need to divide the moles of solute by the volume of the solution in liters. Here's how we can calculate it step by step:

Convert the mass of Na2CrO4 to moles:

  The molar mass of Na2CrO4 can be calculated by adding the atomic masses of each element:

  Na: 22.99 g/mol x 2 = 45.98 g/mol

  Cr: 52.00 g/mol

  O: 16.00 g/mol x 4 = 64.00 g/mol

  Total molar mass = 45.98 g/mol + 52.00 g/mol + 64.00 g/mol = 161.98 g/mol

  Now, we can calculate the moles of Na2CrO4 by dividing the given mass by the molar mass:

  Moles of Na2CrO4 = 12.9 g / 161.98 g/mol ≈ 0.0795 mol

Convert the volume of the solution to liters:

  The given volume is 720 mL. We need to convert it to liters by dividing by 1000:

  Volume of solution = 720 mL / 1000 mL/L = 0.720 L

Calculate the molarity:

  Molarity (M) = Moles of solute / Volume of solution in liters

  Molarity = 0.0795 mol / 0.720 L ≈ 0.11 M

Therefore, the molarity of the solution prepared by dissolving 12.9 g of Na2CrO4 in enough water to produce a solution with a volume of 720 mL is approximately 0.11 M.

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The most likely cause of earthquakes that occur in the area shown on the map is due to fault lines in the earth's crust.

Earthquakes are natural phenomena characterized by the shaking or trembling of the Earth's surface.

They occur due to the sudden release of energy in the Earth's crust along fault lines, which creates seismic waves that propagate through the Earth.

The Earth's crust is composed of several large tectonic plates that float on the semi-fluid layer of the Earth's mantle.

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Answer:

4g of hydrogen

Explanation:

4g of hydrogen (molar mass 2) corresponds to 2 moles of molecules or 4N number of atoms where N is the Avogadro's number (6.023×10

23)

Answer:

6.02 × 10^23 molecules = 1 mole

5.27 × 10^45 molecules = x

x = 5.27 × 10^45/ 6.02 × 10^23 × 1

= 8.754 × 10^21 mol

I don't know if it's correct but based on the question that was the only way I saw how to work it out

The question is incomplete; the complete question is;

In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty with space with-

Protons orbiting a dense nucleus made of electrons and neutrons

Electrons orbiting a dense nucleus made of protons and neutrons

Neutrons and protons orbiting a cloud of electrons

Electrons and protons orbiting a cloud of neutrons

Answer:

Electrons orbiting a dense nucleus made of protons and neutrons

Explanation:

Rutherford established the nuclear theory of the atom by his famous experiment. In his experiment, alpha particles were used to bombard a thin gold foil and the movement of the particles was observed on a moveable zinc sulphide screen.

It was discovered from the experiment that the atom was mostly made up of empty space. The electrons orbit a dense nucleus comprising of protons and neutrons.

Answer:

The correct answer is the third option.

Explanation:

\(2NBr_3 + 3NaOH\rightarrow N_2 + 3NaBr + 3HOBr\)

Moles of nitrogen tribromide = 40 mol

Moles of sodium hydroxide = 48 mol

According to reaction, 2 moles of nitrogen tribromide reacts with 3 moles of sodium hydroxide, then 40 mol of nitrogen tribromide will react with:

\(=\frac{3}{2}\times 40 mol=60 \text{mol of NaOH}\)

This means that in order to completely react with 40 moles of nitrogen tribromide we will need 60 moles of sodium hydroxide.

But according to the question we only have 48 moles of sodium hydroxide which is less than the 60 moles of sodium hydroxide which indicates that sodium hydroxide is present in a limited amount and nitrogen tribromide is present in an excess amount.

So, the limiting reagent is sodium hydroxide, hence the correct answer is the third option.

(a) Carbon monoxide (CO) emissions from internal combustion engines increase in colder climates. Thus, the environmental damage from CO emissions is worse in the winter months than in the summer months.

Nonetheless, air quality control authorities use a standard for CO that is uniform throughout the year with no allowance for seasonal effects. Suppose you are in charge of setting a policy for CO emissions. The marginal damages cost (MD) in the winter is 3E and in the summer is 2E. The MAC of CO emissions in both winter and summer is 60-E. To ensure an allocatively efficient outcome across the two seasons, the marginal damage cost (MD) and the marginal abatement cost (MAC) should be equal. At the point where MD=MAC, social welfare will be maximized. Therefore, equating marginal damage cost (MD) and marginal abatement cost (MAC) in both winter and summer gives: 3E = 60 - E2E = 60 - EE = 20. Thus, the government should set a uniform CO emission standard for winter and summer seasons at 20 to ensure an allocatively efficient outcome across the two seasons.

(b) If the government sets a policy that says emission level for winter and summer will be equiproportion, i.e., E = 15, determine the change in net benefit or welfare loss associated with this policy. MD of CO emission in winter = 3E = 3(15) = 45MD of CO emission in summer = 2E = 2(15) = 30 MAC of CO emission in both winter and summer = 60 - E = 60 - 15 = 45. For a policy that says emission level for winter and summer will be equiproportion, the level of CO emission will be E = 15. The corresponding net benefit can be found as: NB = MB - MC = (MD - MAC) * E = (45 - 45) * 15 = 0. Therefore, the net benefit or welfare loss associated with this policy is zero.

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Answer:

Explanation:

The percent composition of carbon in acetic acid is 40.002%.

Answer:Ionic bonds usually occur between metal and nonmetal ions.

Explanation:

Petroleum but also crude oil are used to make gasoline, a type of fuel. It has a liter measurement and contains liquid. 114 liters of fuel make up a tank containing 30 gallons in it.

The density of the mass that occupies space is generally measured by its volume. Having the mass but instead density of the substance will allow you to compute the volume of the matter.

It is given that,

1 gallon = 3.8 L

30 gallon = 30 × 3.8 = 114 L.

Therefore, the volume of the gasoline will be 114 L.

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Answer:

number one

Explanation:

hope I helped

The mass number is the atomic mass rounded to a whole number.

The mass number, can be regarded as the atomic mass number or nucleon number, which can be seen as the total number of protons  as well as neutrons in an atomic nucleus however if it is  approximated , it can be considered to be equal to the atomic mass of the atom expressed in atomic mass units.

It should be noted that the mass number is established by rounding the atomic weight to the nearest whole number.

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Answer:

Which has the longest wavelength?

✔ microwaves

x infrared

x visible

x X-rays

Which has the highest frequency?

✔ X-rays

x infrared

x microwaves

x visible

Explanation:

I apologize if this was a late answer or if this doesn't answer your original question, but hope this helps! :)

Answer:

Microwaves then X rays

Explanation:

Answer:

Cu3(PO4)2 + 3Ni → Ni3(PO4)2 + 3Cu is that what you were looking for

Explanation:

Hope this helps

Answer:

convert the 25.13 g of Fe2O3 into moles by dividing by its molar mass (159.69) to get that. When looking at the stoichiometric coefficients, we can see that for every 1 mole of Fe2O3, there needs to be 3 moles of CO.

Explanation: