1.3 How Science Works - Notes
What is science?

volume of carbon dioxide is produced in the first minute 0.56 L of CO₂

Salt, carbon dioxide, and water are produced when metal carbonate and an acid react. In order to create calcium chloride (CaCl2), carbon dioxide (CO2), and water, calcium carbonate (CaCO3) combines with hydrochloric acid (HCl) (H2O). We are aware that 22.4 L is the volume occupied by 1 mole of any gas at 0° C and 1 atm pressure.

Thus, 100 g of CaCO₃ produces 22.4 L of CO₂

So, 2.5 g CaCO₃ will form, which equals 100.

56 L of CO (2.5*22.4/100)

= 0.56 L of CO₂

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Answer:

main sequence

Explanation:

now nae nae

The sun, like 80 to 90 percent of stars, is in main sequence stage of life.

The main sequence stars fuse hydrogen atoms to form helium atoms in their cores.

The main sequence is a band of stars that appears on plots of the Hertzsprung–Russell diagram

The Hertzsprung–Russell diagram puts each star on a graph according the star's brightness against its temperature.

About 90 percent of the stars in the universe are main sequence stars.

Nuclear reaction is in the inner core of the Sun and hydrogen is conveted into helium.

The inner core is the central region of the Sun and all solar energy is produced in the core by nuclear fusion.

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After 24 days, you will have 1/2 kg

It's a common occurrence for radioactive isotopes to spontaneously decay over time, shedding their radioactive atoms. The period of time it takes for any sample of an element to be reduced to half its initial amount is known as the half-life of a radioactive isotope. The differential equation

dNdt=kN(t)

describes the decay of such radioactive isotopes, where N(t) is the number of radioactive atoms of the element that are still present at time t and k is the decay constant.

The solution to the aforementioned differential equation is N(t) = N (0)ekt, where N (0) is the initial sample's initial number of atoms.

Keep in mind that the natural logarithm has the identity

a ln n=a ln n.

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When the force become stronger, the acceleration becomes larger and the velocity changes by a wider margin.

We know that the force is that which makes motion to occur. In other words, an object would continue in its state of rest or uniform motion unless it is acted upon by an external force.

We know that the stronger the force the greater the acceleration since force is directly proportional to the acceleration of a body. Given this statement, it is important to also know that acceleration is the change of velocity with time.

When the force become stronger, the acceleration becomes larger and the velocity changes by a wider margin.

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One chemical that could be used for the neutralization of HCl is sodium hydroxide.

Neutralization is a reaction that occurs between an acid and a base to yield salt and water only. In this type of reaction the acid is rendered less harmful than it was when it poured on the bench.

One chemical that could be used for the neutralization of HCl is sodium hydroxide. It must be know that a base has to be used for the neutralization and it has to be a strong base such as sodium hydroxide.

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A is 14.03 in the given equation y = Ax + (Bx^2)/2, if we substitute y = 23.2, x = 1.40 and B = 3.63.

This is an algebraic equation with two variables of order 2. The values of x, y and the coefficient of x^2 is given here.

The given equation y = Ax + (Bx^2)/2 has the variables A, x, y, and B.

By substituting the variables y, x, and B, we can get A from the equation.

y = 23.2

x = 1.40

B = 3.63

Substituting these values,

23.2 = A*1.40 + (3.63*1.4^2)/2

23.2 = 1.4A + 3.63*1.96/2

23.2 = 1.4A + 7.1148/2

23.2 - 3.5574 = 1.4A

1.4A = 19.6426

A = 19.6426/1.4

A = 14.03

Therefore, A = 14.03

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Answer: One

Explanation: All elements have just one proton and one neutron

129 pounds of gasoline will it hold if the gasoline has a density of 0.737 g/ml.

Stoichiometry helps us use the balanced chemical equation to measures quantitative relationships and it is to calculate the amount of products and reactants that are given in a reaction.

Density is defined as mass per unit volume. S.I unit if density is kg/m³.

It is expressed as

Density = [tex]\frac{\text{Mass}}{\text{Volume}}[/tex]  or [tex]d = \frac{m}{V}[/tex]

Now,

= [tex]21.0\ \text{gallon} \times \frac{3.785\ L}{1\text{gallon}} \times \frac{1000\ mL}{1\ L} \times \frac{0.737\ g}{1\ mL} \times \frac{1\ kg}{1000\ g} \times \frac{2.2046\ \text{pounds}}{1\ kg}[/tex]

= [tex]\frac{21.0 \times 3.785 \times 1000 \times 0.737 \times 2.2046}{1 \times 1 \times 1000 \times 1}\ \text{pounds}[/tex]

= 129 pounds.

Thus from the above conclusion we can say that 129 pounds of gasoline will it hold if the gasoline has a density of 0.737 g/ml.

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Some element have parentheses around atomic mass because it form subgroup of atom within a molecule. the number in parentheses is the mass no of most stable isotopes of that element

Parentheses means in a particular structure are repeated in molecule called parentheses. parentheses is used because to help identity that there  is more than one polyatomic ion present. parentheses are useless in chemical formula if they don't have a subscript.

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K₂CO₃ has three element and name of element is potassium, carbon, oxygen and total number of atom is six and the three atom is of oxygen

K₂CO₃ is an inorganic compound with chemical name potassium carbonate and it is also called carbonate of potash, or dipotassium carbonate or Pearl ash and it is a dipotassium salt of carbonic acid and it is widely used in the production of glass and soap

Here given compound is K₂CO₃ which has three element and name of element is potassium, carbon, oxygen and total number of atom is six means 2 potassium one carbon and three oxygen atom and the three atom is of oxygen and subscript and coefficient means number of element which is present in the compound

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From the options provided for the element, a gas is a property that neon may have based on its location in the periodic table.

Neon is an inert gas. The elements of group 8 A are the inert gases. They are - Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Rn). Inert gases are stable and they are not reactive chemically.. Inert gases are also called as noble gases.

Neon element is a gas which cannot be shiny or dull. It is clear and colorless. So, it cannot have this property.

Neon element is an inert gas. They have complete valence shells and do not have any free electrons. Therefore, they are poor conductors of electricity.

Neon element belongs to the group 8, which is inert gas. Therefore, it has property of gas.

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Answer:

element

Explanation:

its the only substance type of antom called the element so yeah

Answer:  KE: 3.43 J

Explanation:

Kinetic energy is represented by the equation [tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex], with 'm' representing mass and 'v' representing velocity.  In this problem, the mass is 3.5 kg, and the velocity is 1.4m/s. Once you do the math, you get:

KE: 3.43 J

Note: J represents joules, the unit of measure used when writing the number for kinetic energy, as well as other things.

True, there should be a balance maintained between consumers, producers and Decomposers. An increase or decrease in either of them would lead to an imbalance in the ecosystem.

Answer:false

Explanation:

8 x 10^12 kg C yr^-1  of C were placed in the atmosphere each year.

kg of C yr-^1  = (8 Pg C yr^-1)(10^15 g C/1 Pg C)(1 kg C/1000 g C)

kg of C yr^-1  = 8 x 10^12 kg C yr^-1

Petagrams is unit of mass equal to 1,000,000,000,000,000 (10^15) grams. Symbol: Pg

Sometimes used in Carbon Dioxide numbers, it is equivalent to Metric Gigatons (Giga) 10^9 x (Ton) 10^3 x (kg) 10^3 = 10^15

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Answer:

There are 1.0 * 10^9 seconds in 32 years.

Explanation:

To solve this problem, we will use dimensional analysis, or multiplying by fractions equivalent to 1.

We are starting with a value in years. Since we know that there are 365 days in 1 year, we can multiply the given value (in years) by 365 days/1 year to cancel out the units of years and convert to days:

32 years * 365 days/1 year = 11,680 days

Next, we can use the same idea to convert from days to hours:

11,680 days * 24 hours/1 day = 280,320 hours

And then again for hours to minutes and minutes to seconds:

280,320 hours * 60 minutes/1 hour * 60 seconds/1 minute

= 1009152000 seconds

This answer is quite large, so we will convert to scientific notation to make the value more manageable.

1009152000 seconds = 1.0 * 10^9 seconds

Therefore your answer is 1.0 * 10^9 seconds.

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A substance is held in an open container its particles move fast one another at random speeds but do not leave the container then When enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them

When more gas particles enter a container, there is less space for the particles to spread out, and they become compressed and the particles exert more force on the interior volume of the container and this force is called pressure and in gases the particles move rapidly in all directions, frequently colliding with each other and the side of the container with an increase in temperature, the particles gain kinetic energy and move faster and that's why in the open container particles moves fast one another and when enough heat is removed then the particles no longer have enough speed to overcome the weak attractive forces between them

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The increasing order of basicity, putting least basic nitrogen atom first are as follow:

N2 < N1 < N3.

The basicity of the atom is inversely proportional to the resonance.

Resonance is also termed as mesomerism, is defined as a way of telling the bonding in certain polyatomic ions or molecules by the combination of varies contributing structures into the resonance hybrid in the valence bond theory.

Since, in N2 due to the presence of lone pair of electron and it not even donate these lone pair of electron. On the other hand they take part in resonance, therefore the basicity of the N2 is least.

In N3 the lone pair of electron is present and it able to donate these lone pair of electron to the sp3 hybridization, therefore the basicity of the N3 is more than N2.

Thus, we concluded that increasing order of basicity, putting least basic nitrogen atom first are N2 < N1 < N3.

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Answer:

Explanation:

P.S - Get a good lighting when taking the pictures because you kinda gave me a hard time reading the questions. Thank you.

The diatomic gas is Fluorine

Given:

mass of diatomic gas = 4.37-g

volume of diatomic gas = 3 l

temperature = 45°c = 318 K

R in Lt-atm scale 0.08205736(14) L-atm/K-mol

~ 0.082

To Find:

identify this gas

Solution: Working equation: PV = nRT (Ideal gas law)

n (no of moles) = m(mass)/M (Molecular wt.)

3.1 = (4.37/M) x 0.082 x 318

M = 37.985

Now the only diatomic gas which has closest molecular mass is Fluorine (F2) (37.997). The difference in value is probably coming from approximation.

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Answer: 1 spoon

Explanation:

Amount needed= 5 grams or 5000 mg

The spoon holds 5000 gm

So, One spoon of baking soda is needed for the experiment.

The mass of Fe2O3 is 8.839 x 10^-14 g

The first step is to determine the number of moles of Iron (III) Oxide that contains a billion O atoms.

1 x 10^9 O atoms*1 mol O/6.022 x 10^23 atoms*1 mol Fe2O3/3 mol O = 5.535 x 10^-16 mol Fe2O3

By using the molar mass of Iron (III) Oxide, we arrive with the mass in grams that contains a billion O atoms.

5.535 x 10^-16 mol Fe2O3*159.69 gram/1 mol Fe2O3

= 8.839 x 10^-14 g Fe2O3

Hence, mass of Fe2O3 is 8.839 x 10^-14 g

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The procedure that cannot be performed on a hot plate, requiring a bunsen burner instead include A. Heating a crucible to remove water from a hydrate.

The procedure that can be performed on a hot plate are:

a. Heating a solvent to help a solute dissolve.

b. Heating an isolated solid to dry it.

c. Heating water to boiling for a water bath.

It should be emphasized that heating a crucible in order to extract water from a hydrate cannot be done using a hot plate. Anyone should avoid heating any ceramic or silica items on a hot plate.

The ideal solution is to heat a crucible to extract the water from a hydrate.

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The amount made from removing 68.1 kilograms of old copper tubing is $375.34.

The amount made from removing 68.1 kilograms of old copper tubing is calculated as follows;

A = mass x cost per mass

mass = 68.1 kg = 150.1348 lb

Amount = $2.5/lb x 150.1348 lb

Amount =  $375.34

Thus, the amount made from removing 68.1 kilograms of old copper tubing is $375.34.

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Answer: https://homework.study.com/explanation/if-the-pk-a-values-for-phosphoric-acid-are-2-15-6-82-and-12-38-at-what-ph-would-one-observe-equal-amounts-of-h-2-po-4-and-hpo-4-2.html

Explanation:

website to the answer lol

Answer:  3

Explanation:   your protons are your atomic number and the atomic mass is the proton and neutrons totaled

Cells from the air would have fallen into the sterilized growth medium in the flask and grown there if Pasteur had broken off the swan neck of the flask one week after boiling the nutrient broth to sterilize the flask.

He was referred to as a microbiologist who was responsible for many advances in science through experiments and an example is the one which was done using broth.

He heated the flask after it was sealed to kill microbes present in it and the result was nothing grew in the sample. However, if he had broken off the swan neck of the flask one week after boiling, cells from the air would have fallen into the sterilized growth medium in the flask and grown there.

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The total number of atoms present in the carbon

atom ¹³C is 2.32 × 10²³ atoms. And the number of electrons present in 2.32 × 10²³ is 1.392 × 10²⁴ electrons.

Carbon is a non-metallic element. It is the element of group 14 of the periodic table. It is tetravalent. It is presented by the symbol 'C'. The atomic number of carbon is 6. And the atomic mass of carbon is 12.011 u. Carbon has four valence electrons.

Total number of atoms present in the carbon atom

[tex] ^{13} C = 2.32 \times 10^{23} \: atoms[/tex]

Total number of electrons present in the carbon atom

[tex] ^{13} C = 1.39 \times 10 ^{24} \: electrons[/tex]

The atomic number of carbon atom

[tex] ^{13} _{6}C = 6[/tex]

The number of electrons present in carbon is,

The atomic number of carbon = the number of electrons

Atomic number = 6

Number of electrons = 6

[tex]The \: number \: of \: electrons \: present \: [/tex]

[tex]in \:2.32 \times 10^{23} \: atoms \: of \: carbon,[/tex]

= Number of electrons present in one carbon atom ×

[tex]2.32 \times 10 ^{23} [/tex]

[tex] = 6 \times 2.32 \times 10 ^{23} [/tex]

[tex] = 1.392 \times 10 ^{24} [/tex]

Therefore, the total number of atoms present in the carbon atom ¹³C is 2.32 × 10²³ atoms. And the number of electrons present in 2.32 × 10²³ is 1.392 × 10²⁴ electrons.

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