Science investigation skills

(I need to have 5 answers )


Answer 1.

Predict



Answer 2.

Use variable


Answer 3.

Plan and conduct investigations

Answer 4.
Draw conclusions


Answer 5.

Hypothesize


Answer 6.

Measure


Answer 7.

Classify and order




Answer 8.

Record and display data


Answer 9.

Use time and space relationships




Answer 10.

Use numbers

No atoms are lost or made during the chemical reaction so the total mass of the products is equal to the total mass of the reactants. In an atom, protons and neutrons contribute to the mass and since the number of them doesn’t change, the mass doesn’t either.

Answer:

The less valence electrons an atom has, the least likely it will gain electrons. Electron affinity decreases down the groups and from right to left across the periods on the periodic table because the electrons are placed in a higher energy level far

Explanation:

Answer:

Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons. Remember that greater the distance, the less of an attraction; thus, less energy is released when an electron is added to the outside orbital. In addition, the more valence electrons an element has, the more likely it is to gain electrons to form a stable octet. The less valence electrons an atom has, the least likely it will gain electrons.

Electron affinity decreases down the groups and from right to left across the periods on the periodic table because the electrons are placed in a higher energy level far from the nucleus, thus a decrease from its pull. However, one might think that since the number of valence electrons increase going down the group, the element should be more stable and have higher electron affinity. One fails to account for the shielding affect. As one goes down the period, the shielding effect increases, thus repulsion occurs between the electrons. This is why the attraction between the electron and the nucleus decreases as one goes down the group in the periodic table. hope i helped

Explanation:

Answer:

1kg= 1000 grams hope it helps

Answer:

Subatomic particles

Explanation:

I hope it helped

Answer:

mol is a measurement of large amounts so big

To multiply the numbers and round the answer to the correct number of significant figures, follow these steps: Multiply the numbers, and Determine the number of significant figures in the original numbers.       3.293 X 0.82 = 2.7 (rounded to 2 significant figures).

To multiply the numbers and round the answer to the correct number of significant figures, follow these steps:

Step 1: Multiply the numbers: 3.293 x 0.82 = 2.69726.

Step 2: Determine the number of significant figures in the original numbers. In this case, 3.293 has 4 significant figures, and 0.82 has 2 significant figures.

Step 3: Round the result to the least number of significant figures among the original numbers, which is 2 significant figures in this case.

Step 4: Round the result to 2 significant figures: 2.7.

Therefore, \(3.293 X 0.82 = 2.7\)  (rounded to 2 significant figures).

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The given statement "Heat is not a measure of the ability of a substance to take in or give up heat" is false. . Heat is actually the energy transferred from one body or system to another due to a difference in temperature.

Heat can be thought of as a flow of energy from hotter to cooler objects, and it is measured in joules (J) or calories (cal). The ability of a substance to take in or give up heat is actually described by its specific heat capacity.

Specific heat is defined as the amount of heat energy required to raise the temperature of one unit of mass of a substance by one degree Celsius. Therefore, a substance with a high specific heat can take in or give up more heat energy than a substance with a low specific heat for the same change in temperature.

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The approximate resistance value at 45 degrees Celsius is around 5.8 ohms.

To calculate the value of the resistance temperature coefficient at 45 degrees Celsius using linear approximation, we can use the formula:

R(T) = R0 + α(T - T0),

where R(T) is the resistance at temperature T, R0 is the resistance at a reference temperature T0, α is the resistance temperature coefficient, and (T - T0) is the temperature difference.

Given that the resistance at 25 degrees Celsius is 5 ohms (R0 = 5) and the resistance at 50 degrees Celsius is 6 ohms (R(T) = 6), we can calculate the value of α.

6 = 5 + α(50 - 25),

Simplifying the equation:

1 = 25α,

Therefore, α = 1/25 = 0.04 ohm/degree Celsius.

Using the linear approximation, we can approximate the value of the resistance at 45 degrees Celsius:

R(45) = 5 + 0.04(45 - 25) = 5 + 0.04(20) = 5 + 0.8 = 5.8 ohms.

Therefore, the value of the resistance at 45 degrees Celsius is approximately 5.8 ohms.

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Answer:

7.7g CaCo3

Explanation:

The chemical formula that shows the actual number and kinds of atoms present in one molecule of a compound is called the molecular formula.

The subscripts in a chemical formula have significant meaning in determining the actual number and kinds of atoms present in one molecule of a compound. The subscripts represent the ratio of each type of atom in the compound. For example, in the formula H2O, the subscript 2 indicates that there are two hydrogen atoms and the subscript 1 indicates that there is one oxygen atom in each molecule of water. The subscripts are crucial in determining the chemical and physical properties of the compound, such as its molecular weight, reactivity, and boiling and melting points. Understanding the significance of the subscripts in a chemical formula helps to better understand the composition and behavior of a compound.

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The controversy surrounding beryllium's atomic mass arose from differing assumptions about its valence and resulting formula of its oxide. Berzelius believed it was trivalent (Be3+), while Mendeleev thought it was divalent (Be2+). A. Combes later reacted beryllium with an anion and measured the density of the gaseous product to determine its atomic mass, obtaining data in two different experiments.

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No, the volume of water in a beaker is not an extensive property.

Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.

In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.

Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.

It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.

In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.

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Answer:

4 moles CO₂ = 4 moles O₂

Explanation:

The reaction equation is given as;

         2C₂H₅OH + 7O₂ →  4CO₂  + 6H₂O

The incorrect mole ratio from the relationships shown is;

       4 moles CO₂ = 4 moles O₂

Number of moles of CO₂ = 4

Number of moles of O₂ = 7

 So, the right expression is;

               4 moles CO₂ = 7 moles O₂  

Answer:

P

1

V

1

T

1

=

P

2

V

2

T

2

Explanation:

P

1

V

1

T

1

=

P

2

V

2

T

2

, given a constant quantity of gas.

And thus,  

P

1

×

V

1

×

T

2

V

2

×

T

1

=

P

2

, even given this format, we can see the problem is dimensionally sound. We do need to use  

absolute temperature.

P

2

=

1.00

⋅

a

t

m

×

250

⋅

m

L

×

313

⋅

K

500

⋅

m

L

×

293

⋅

K

≅

1

2

⋅

a

t

m

.

Explanation:

a. The breakdown voltage of air is a function of pressure and air gap spacing.

b. The minimum breakdown voltage occurs when the applied voltage reaches a critical value, which depends on the pressure and air gap spacing.

c. The minimum breakdown voltage occurs at atmospheric pressure (1 atm).

d. The minimum breakdown voltage occurs when the air gap spacing is 1 mm.

e. Gaseous insulation is preferred over liquid or solid insulation because it is more reliable, has higher dielectric strength, and is less likely to become contaminated or corroded. Additionally, gaseous insulation can be used in a wider range of operating temperatures.

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Answer:

16.67 grams  of  H₂ is generated from the electrolysis of 150 grams of H₂O

Explanation:

Electrolysis is the decomposition of a chemical element under the effect of an electric current. So, electrolysis of water is the process of decomposing the H₂O molecule into separate oxygen and hydrogen gases due to an electric current passing through the water.

The balanced equation of electrolysis of water is:

2 H₂O → O₂ + 2H₂

Being:

then the molar mass of the compounds that participate in the reaction is:

If the following amounts in moles are reacted by stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction):

the amount of mass, by stoichiometry, that reacts and is produced is:

Then you can apply the following rule of three: if by stoichiometry 36 g of H₂O generate 4 g of H₂, 150 g of H₂O how much mass of H₂ will it generate?

\(massofH_{2} =\frac{150 grams of H_{2}O*4 grams ofH_{2} }{36 grams of H_{2}O}\)

mass of H₂= 16.67 grams

16.67 grams  of  H₂ is generated from the electrolysis of 150 grams of H₂O

\(\text{Hello there! :)}\)

\(\large\boxed{V = 800cm^{3} }\)

\(\text{Formula for the volume of a rectangular prism:}\\\\V = l * w * h\\\\\text{In this instance:}\\\\l = 40 cm\\w = 20 cm\\h = 10cm\\\\\text{Use the formula to solve for the volume:}\\V = 40 * 10 * 2\\\\V = 800cm^{3}\)

Answer: The main difference between the two is their fat content. Heavy cream has slightly more fat than whipping cream. Otherwise, they are nutritionally very similar. You can use them interchangeably in recipes without affecting the taste, although they may lead to different consistencies.

Explanation:

Water and toluene are not miscible. Among the following (d) C₆H₅CH₃ is most likely the formula of toluene.

Toluene is a substituted aromatic hydrocarbon that is also known by the term toluol. It is an odourless liquid that is insoluble in water and has the characteristic odour of paint thinners. It is a mono-substituted benzene derivative that consists of a methyl group (CH3) that is connected to a phenyl group. Benzene is the parent compound. As a consequence of this, the name given to it by the IUPAC is methylbenzene. Toluene is utilised mostly in the industrial sector as both a feedstock and a solvent.

So the right option is option D, while others are soluble due to their polarity and functional group pressure.

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Answer:

3.495

Explanation:

pH = -log of H⁺ concentration, so the answer is 3.495

The gas law that applies to this scenario is the Ideal Gas Law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature in Kelvin.

Rearranging the Ideal Gas Law to solve for pressure (P), we get:

P = nRT/V

Substituting the given values, we get:

P = (36.0 mol)(0.0821 L•atm/K•mol)(25.0 + 273 K) / 12.4 L

P = 98.9 atm

Therefore, the hydrogen gas must be compressed to a pressure of 98.9 atm.

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Answer:

It would be B)

Explanation:

It wont be C because nothing is happening its just being released, but in B its being changed by the UV rays. So this is a chemical change or looks like the best answer out of all these

Complete Question

What is the most dense a marble(2.56), quartz (2.64), or diamond (3.52).

Answer:

Diamond with a density of 3.52

Explanation:

When we say an object is dense, this means how heavy a substance or object can be.

Density can be defined as the mass per unit volume of an object of an object or a substance.

In the above question, we were given 3 substances or compounds with their respective densities:

marble(2.56)

quartz (2.64)

diamond (3.52).

We are asked to find the one that is most dense. This means we are to find the one with the highest density.

From amongst the three compounds, the most dense is Diamond with a density of 3.52.

Based on the given options, the compound that will display two triplets and a singlet in the 1H NMR spectrum is CH3OCH2CH(OH)CH3.

This compound has a methoxy group (CH3O-) attached to a methylene group (CH2), which is further connected to a CH group bearing a hydroxyl group (OH).

The presence of these three distinct proton environments (CH3, CH2, and CH) gives rise to two triplets and a singlet in the 1H NMR spectrum.

The methoxy and methylene protons will each appear as a triplet due to their neighboring protons, while the CH proton will appear as a singlet since it is not coupled to any neighboring protons.

The other compounds in the options do not meet the criteria of having two triplets and a singlet in their 1H NMR spectra.

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The rate of the reaction is directly proportional to the stability of the carbocation intermediate, and any changes in the solvent will affect the rate of the reaction.

In an SN1 reaction, the rate-determining step is the formation of a carbocation intermediate. The stability of the carbocation intermediate affects the rate of the reaction.

In this case, if 2-propanol (isopropanol) was used instead of 2-methyl-2-propanol (t-butanol), the rate of the reaction would decrease. This is because the carbocation intermediate formed in 2-propanol is less stable compared to the one formed in t-butanol.

The carbocation intermediate formed in t-butanol is tertiary, which is more stable than the one formed in isopropanol, which is secondary. This means that the reaction will be slower in isopropanol due to the less stable carbocation intermediate.

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List 1 is the best choice of materials because it has a balance between biotic decomposers and abiotic factors needed for the worms and composting.

Composting is the process whereby remains of organic matter are keep in a favorable environment and conditions in order to allow for decomposition.

Compost consists of the right mix of biotic factors suchas worms and fungi as well as abioticfactors such as water and sun.

Therefore, based in the materials provided, List 1, because it has a balance between biotic decomposers and abiotic factors needed for the worms and composting.

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