What is hypotheses
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Answer: 1.466 g/mL

Explanation:

[tex]\frac{0.6305 \text{kg}}{0.430 \text{L}} \cdot \frac{1000 \text{g}}{1 \text{kg}} \cdot \frac{1 \text{L}}{1000 \text{mL}} = 1.466 \,\frac{\text{g}}{\text{mL}}[/tex]

Complete Question :

Which of the following describes scientists?

A. People with similar personalities

B. People from different backgrounds

C. People with perfect understanding of science

D. People with only one perspective

Answer :

Scientists can be described as People with perfect understanding of science. Hence, Option (C) is correct answer

A scientist is a person who conducts scientific research to advance knowledge in an area of interest.

Scientists are motivated to work in several ways. Many have a desire to understand why the world is as we see it and how it came to be. They exhibit a strong curiosity about reality.

Therefore, Scientists can be described as People with perfect understanding of science. Hence, Option (C) is correct.

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Answer:

H2(hydrogen gas)

Explanation:

The reaction between magnesium and hydrochloric acid combine to form a salt (magnesium chloride) and release gas (hydrogen).

Answer:

saturared alkane

because of its single bonded

Answer:

keeping things above 40 degrees Celsius as that can fasten the rot process of fruits and vegetables

Light, oxygen, heat, humidity, temperature and spoilage bacteria can contribute to food spoilage

Tiny living things called microorganisms like bacteria, molds, and yeasts can get into our food and make it go bad. They can become larger in size and increase in number, causing the food to feel different, look different, smell different, and taste different.

Enzymes in food can speed up spoilage. Enzymes can break apart the nutrients in food, which can cause the food to change and become less fresh.

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The one that does not demonstrates the law of conservation of matter would be the third option: [tex]2NO_2 + H_2O -- > HNO_3 + HNO_2[/tex]

It is a law that explains that matters are conserved during the course of chemical reactions. They can neither be destroyed nor created.

Thus, the number of moles of the species in a reaction remains the same before and after the reaction.

Thus, an equation that demonstrates the law of conservation of matter will be balanced in terms of the number of moles of species.

The only equation, in this case, is [tex]2NO_2 + H_2O -- > HNO_3 + HNO_2[/tex]

There are 3 oxygen species on the reactant while 5 are present on the product side.

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Taking into account the definition of calorimetry, the mass of the sample is 159.85 grams.

In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

In this way, between heat and temperature there is a direct proportional relationship (Two magnitudes are directly proportional when there is a constant so that when one of the magnitudes increases, the other also decreases; and the same happens when either of the two decreases .).

The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat by the mass of the body.

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case:

Replacing in the expression to calculate heat exchanges:

3750 J= 1.02 [tex]\frac{J}{gC}[/tex]× m× 23 C

Solving:

m= 3750 J ÷ (1.02 [tex]\frac{J}{gC}[/tex]× 23 C)

m= 159.85 grams

In summary, the mass of the sample is 159.85 grams.

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Explanation:

Metano: CH₄; Etano: C₂H₆; Propano: C₃H₈; Butano: C₄H₁₀; Pentano: C₅H₁₂; Hexano: C₆H₁₄; Heptano: C₇H₁₆; Octano: C₈H₁₈; Nonano: C₉H₂₀; Decano

Answer:

52.6 g C₆H₆O₂

Explanation:

Unfortunately, the problem does not specify which of the reactants is the limiting reagent. This means you must convert both starting amounts into the product to identify the final answer.

To find the mass of hydroquinone (C₆H₆O₂) produced, you need to (1) calculate the molar masses of the reactants and product, then (2) convert grams of the reactants to grams of the product (via the molar masses and the mole-to-mole ratio from equation coefficients), and then (3) determine the limiting reagent and the actual answer.

(Step 1)

Molar Mass (C₆H₅OH): 6(12.011 g/mol) + 6(1.008 g/mol) + 15.998 g/mol

Molar Mass (C₆H₅OH): 94.112 g/mol

Molar Mass (H₂O₂): 2(1.008 g/mol) + 2(15.998 g/mol)

Molar Mass (H₂O₂): 34.012 g/mol

Molar Mass (C₆H₆O₂): 6(12.011 g/mol) + 6(1.008 g/mol) + 2(15.998 g/mol)

Molar Mass (C₆H₆O₂): 110.11 g/mol

(Step 2)

It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to reflect the sig figs of the given values.

45.0 g C₆H₅OH             1 g              1 mole C₆H₆O₂             110.11 g
------------------------  x  --------------  x  -------------------------  x  -----------------  =
                                  94.112 g         1 mole C₆H₅OH            1 mole

=  52.6 g C₆H₆O₂

20.0 g H₂O₂           1 mole             1 mole C₆H₆O₂           110.11 g
-------------------  x  -----------------  x  -------------------------  x  ---------------  =
                              34.012 g              1 mole H₂O₂            1 mole

=  64.7 g H₂O₂

(Step 3)

The limiting reagent of the reaction is C₆H₅OH because it is not able to produce as much product as H₂O₂. As such, product stops being made as C₆H₅OH runs out, making the final amount 52.6 g C₆H₆O₂.

Answer:

See below

Explanation:

Mole weight of C6H5OH  = 94 gm/mole       (approx)

   45 gm / 94 gm/mole = .479 Moles of phenol

Mole wt of H2O2  = 34        (approx)

    20 gm / 34 gm /mole = .588 moles of hydrogen peroxide

From the equation.....it takes equal moles of these to react to produce the same number of moles of hydroquinone.....

  there isn't enough phenol to match the peroxide....so phenol is limiting reactant and you will only get .479 moles of hydroquinone

hydroquinone mole weight = 110 gm / mole       (approx)

    .479 mole * 110 gm/mole = 52.69 gm produced

Some of the methods that can be used to prevent diseases and health problems are:

This refers to the proactive measures that are taken in order to stop a disease from ever occurring.

Hence, we can see that disease prevention is important as it helps to keep a person healthy and he can do this by engaging in healthy practices such as washing of hands, etc.

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The half-life of polonium-210, given that it decays from 98.3 micrograms to 12.3 micrograms in 414 days is 138 days

2ⁿ = N₀ / N

2ⁿ = 98.3 / 12.3

2ⁿ = 8

2ⁿ = 2³

n = 3

t½ = t / n

t½ = 414 / 3

t½ = 138 days

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The half life of the polonium-210 is 138 days.

The half-life is the time taken for half the sample to decay.

It takes 414 days for 98.3 g of to decay from 98.3 micrograms to 12.3 micrograms.

The fraction of 98.3 that is 12.3 g = 98.3/12.3 = 1/8

The sample has undergone 3 half-lives.

The half-life = 414/3 = 138 days.

In conclusion, it takes 138 days for half the sample to decay.

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Answer:

Amount of water- constant

reaction rate- variable

temperature- constant

initial amount of tablet- constant

particle size- variable

Explanation:

The rate of increase of NH3 is 0.22M/s.

The balanced equation of the reaction is given below:

The rate of decrease of N2 is half the rate of increase of NH3.

Rate of decrease of N2 = -0.11 M/s

Rate of increase of NH3 = 2 × +0.11 M/s = 0.22M/s.

In conclusion, the rate of formation of products is dependent on the rate of disappearance of reactants.

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Answer:

- Nucleus Function - Controls and regulates the activity of the cell.

- Ribosome builds proteins.

- A vesicle structure is kinda like a sac filled with a fluid of sorts.

- Rough ER has ribosomes attached to the cytoplasmic side of the membrane.

- Golgi apparatus kinda looks like a "stack of peta bread"

- Golgi apparatus functions as a factory in which proteins received from the ER are further processed and sorted for transport to their eventual destinations

The cytoskeleton of a cell is made up of microtubules, actin filaments, and intermediate filaments.

- The smooth endoplasmic reticulum functions in many metabolic processes. It synthesizes lipids, phospholipids as in plasma membranes, and steroids.

- The mitochondria produced energy/ATP

- Mitochondria have a double membrane arrangement that separates the organelle into four distinct compartments

- The cytosol contains an organized framework of fibrous molecules that constitute the cytoskeleton

Answer:

no

Every wave has a specific wavelength

Explanation:

Two interfering waves have the same wavelength

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byjus

From the  stoichiometry of the reaction, 1.4 * 10^-3 g is produced.

The equation of the reaction is written as; CO2 + 2LiOH → Li2CO3 + H2O. This can help us to apply the principle of stoichiometry here.

Thus;

Number of moles of CO2 = 0.00345 g/44 g/mol = 7.8 * 10^-5 moles

If 1 mole of CO2 produced 1 mole of water

7.8 * 10^-5 moles of CO2 produced  7.8 * 10^-5 moles of water

Mass of water produced =  7.8 * 10^-5 moles * 18 g/mol = 1.4 * 10^-3 g

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The disease prevention methods are as follows:

Disease prevention refers to the steps taken to protect oneself from developing a particular disease.

The disease prevention methods for the given diseases is as follows:

In conclusion, disease prevention is the best policy in health care.

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An atom's mass is determined by its protons and neutrons.

An atom's charge is determined by its number of protons minus it number of electrons.

Atoms become cations, or positively charged when they lose an electron, and since electrons have a negative charge, they become anions, or negatively charged.

Water is a universal solvent.

Carbohydrates (carbs) are used by the body for energy.

Steroids and triglycerides are lipids.

Proteins that catalyze chemical reactions are called enzymes.

The correct answers are triple point, Carbonic acid, Antibody production, endocytosis of a virus by a phagocyte lymphocyte. E. T lymphocyte activation and clonal expansion, Corpus luteum and Aorta.

In a phase diagram, triple point is the term used for a substance held at a temperature and pressure where the solid ,liquid and gaseous states of substance exist simultaneously.

Carbonic acid is a substance that is responsible for donating H+ ions to act as a buffer when blood pH rises.

Antibody production, endocytosis of a virus by a phagocyte lymphocyte. E. T lymphocyte activation and clonal expansion are specific immune responses.

Corpus luteum is a mass within the ovary that secrets hormones to maintain the uterine lining during pregnancy.

A myocardial infarction affects Aorta blood vessels of the heart.

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The bromide concentration in this solution of calcium bromide dissolved in enough water to give 469.1 mL is 1.75 × 10-⁵M.

The concentration of a solution can be calculated by dividing the number of moles of the substance by its volume.

No of moles of calcium bromide is calculated as follows:

moles = 1.642 ÷ 199.89 = 8.215 × 10-³moles

Molarity = 8.215 × 10-³moles ÷ 469.1mL = 1.75 × 10-⁵M

Therefore, the bromide concentration in this solution of calcium bromide dissolved in enough water to give 469.1 mL is 1.75 × 10-⁵M.

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M HCl = 11.7 M = 11.7 mol/L = 0.0117 mol/ml

mass HCl = 36.5 g/mol x 0.0117 mol/ml =0.427 g/ml  

% mass = mass HCl : density

% mass = 0.427 : 1.65 = 0.259 = 25.9%

or formula:

M = (%mass x ρ x 10) : MM

% mass = (M x MM) : (ρ x 10)

% mass = (11.7 x 36.5) : (1.65 x 10)

% mass = 25.9

Answer: 11.66g

Explanation:

Number of mole= Mass/Molar Mass

Molar Mass of Na2CO3 = (23*2)+12+(16*3)
                                         = 106g/mol
0.11moles = Mass/(106g/mol)
Mass= 0.11*106
Mass= 11.66g

Molar mass

Mass:-

Precision refers to solute value, sensitivity is the ability to sense a change in solution, whereas accuracy and selectivity refer to the ability to detect the solute.

Potentiometric titration refers to a chemistry analytical strategy used to identify a particular substance, which may be a solute in the solution.

A potentiometric analysis is based on the use of electrodes capable of recording different values of the titrant substance, which enables the determination of the concentration of a given solute.

In conclusion, precision refers to solute value, sensitivity is the ability to sense a change in solution and accuracy and selectivity refer to the ability to detect the solute.

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Answer:

C

Explanation:

This is a chemical reaction because the materials that were mixed have different solubilities than the materials that were made.

Answer:

C

Explanation:

When a chemical reaction occurs, new materials form. Different materials each have unique physical properties, such as solubility.

When olive oil and sodium hydroxide were mixed together, soap and glycerol were made. The table shows that olive oil and sodium hydroxide have solubilities that are different than soap and glycerol. This means that olive oil and sodium hydroxide are different materials than soap and glycerol. Therefore, this is a chemical reaction because the materials that were mixed have different solubilities than the materials that were made.

Water stores energy more efficiently than air under equal conditions.

It requires more energy to heat water than it does to heat air because water has a significantly larger heat capacity and specific heat than air. Compared to air, which has a specific heat of 1.005 J/g degreesC, water has a specific heat of 4.186 J/g degreesC.

Specific heat:

The amount of heat required to raise the temperature per unit mass is known as specific heat capacity. The heat in Joules required to increase the temperature of 1 gram of sample by 1 Kelvin or degree Celsius is often stated. Water is an excellent temperature regulator since it has a very high specific heat capacity.

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The sub-levels in order of the number of electrons they can hold will be s, p, d, and f.

There are 4 sub-levels, namely; s, p, d, and f.

Each level represents an orbital with some orbitals having multiple degenerates.

Thus, the ascending order in terms of the number of electrons each sublevel can hold will be s, p, d, and f.

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Answer:

E

Explanation:

100 minutes is   5 half lives  ( 100 min/20 min/half life)

         = (1/2 )^5

1 x 10^20    *    (1/2)^5 =   3.125 x10^18   molecules

The simulated value of the number of atoms are as follows:

A = 27, B = 16, C = 9, D = 4, E = 2, F = 2, G = 0 and H = 0.

The half-life is the time taken for half the number of atoms in a given sample of the element to disintegrate or decay.

The expected amount of the sample left after a given number of half-lives is given in the table.

The simulated value of the amounts are found to be:

A = 27, B = 16, C = 9, D = 4, E = 2, F = 2, G = 0 and H = 0.

In conclusion, the expected number of atoms and the simulated values of the number of atoms differed slightly.

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