Which of the following is true about tissues and organs?


A. When tissues are combined they make organs.
B. Tissues and organs are the same thing.
C. Organs combine to make tissues.
D. Different tissues can make up the same organ

In order to work safely with volatile chemicals, a Class II Biological Safety Cabinet (BSC) should have the following component:

Chemical-Resistant Construction: The BSC should be constructed with materials that are resistant to the chemicals being used. Commonly, stainless steel or other chemically resistant materials are used to ensure durability and prevent damage from the volatile chemicals.

Additionally, it is important to ensure that the BSC is properly designed and certified to meet the necessary safety standards. This includes factors such as airflow velocity, containment, and appropriate exhaust systems to handle the volatile chemicals effectively.

It is crucial to consult with experts and professionals familiar with the specific volatile chemicals being used, as well as applicable regulations and guidelines, to ensure that the BSC is appropriately equipped and maintained for safe handling of volatile chemicals.

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Answer:

3.10g

Explanation:

Please see the attached picture for the full solution.

Answer:

Definetly Nitrogen

Explanation:

Nitrogen is the most electronegative

Answer:

D would be the best answer

Explanation:

Among the given options example of force acting between two objects is gravity by which an object attracts other objects into its center of mass.

Force is an external agent acting on a body to change it state or motion or rest or to deform it. There are different kinds of forces such as, gravitational force, frictional force, nuclear , magnetic force etc.

Gravitational force is the force by which an object attracts other objects into its center of mass. Earth attracts every objects on its surface into it. This effect is called gravity.

Force of gravitation depends on the mass of both objects and distance between them. Greater the mass, greater will be the force of gravity exerted on it. Thus, option D is correct.

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Answer:

800.3 Kelvin

Explanation:

127°C = 400.15 Kelvin   (because 127 + 273.15)

Charles Law:

\(\frac{V1}{T1} = \frac{V2}{T2}\)   Thus, \(\frac{10.0 L}{400.15 K} = \frac{20.0 L}{T2}\)

Then, work out the math algebraically.  

T2 = 20.0 / (10.0/400.15)

= 20.0 / 0.02499...

= 800.3 Kelvin

This is assuming the pressure remains constant.

Empirical formula = C : H : O = moles of carbon / smallest number of moles : moles of hydrogen / smallest number of moles : moles of oxygen / smallest number of moles

The empirical formula of a compound can be determined by analyzing the masses of the elements in the compound. In this case, we are given that the combustion of 3.69 g of the compound yields 5.40 g of CO2 and 2.22 g of H2O.

To determine the empirical formula, we need to find the moles of carbon (C), hydrogen (H), and oxygen (O) in the given masses of CO2 and H2O.

First, let's find the moles of carbon in 5.40 g of \(CO_{2}\)
Molar mass of \(CO_{2}\) = 12.01 g/mol (C) + 2(16.00 g/mol) (O)

                                 = 44.01 g/mol
Moles of carbon = mass of CO2 / molar mass of \(CO_{2}\) = 5.40 g / 44.01 g/mol = 0.1227 mol

Next, let's find the moles of hydrogen in 2.22 g of \(H_{2}O\)
Molar mass of \(H_{2}O\) = 2(1.01 g/mol) (H) + 16.00 g/mol (O) = 18.02 g/mol
Moles of hydrogen = mass of \(H_{2}O\) / molar mass of \(H_{2}O\) = 2.22 g / 18.02 g/mol = 0.1231 mol

Now, we can determine the moles of oxygen in the compound by subtracting the sum of the moles of carbon and hydrogen from the moles of oxygen:
Moles of oxygen = 3.69 g / molar mass of compound - (moles of carbon + moles of hydrogen)

Lastly, we can determine the empirical formula by dividing the number of moles of each element by the smallest number of moles obtained:
Empirical formula = C : H : O = moles of carbon / smallest number of moles : moles of hydrogen / smallest number of moles : moles of oxygen / smallest number of moles

Please note that without the actual masses of each element in the compound, we cannot determine the exact empirical formula. However, the steps mentioned above will help you determine the ratio of the elements in the compound.

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Every diatomic molecule is having a linear geometry. The shape of dioxygen is linear with double bond between the oxygen atoms.

Molecules are formed by the combination of atoms. There are diatomic , triatomic  or tetratomic molecules or simply polyatomic molecules. Molecule are the basic units of compounds.

Oxygen is an electronegative element and is normally exists as diatomic molecules in atmosphere. Oxygen have 6 valence electrons and need two more electrons to achieve stability.

Thus, one oxygen combines with other by sharing two electrons each and forms a double bond between. Thus the oxygen molecules exhibit a linear geometry.

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The interesting observations you made about the chicken wing is the sphenoid bone and the direction of motion.

This is referred to as a point where two or more bones meet and are usually lined with cartilages so as to reduce the effect of friction as it causes wear and tear of the skeletal structures which are important for our movement.

The chicken has a structure called wing as its hands and has the sphenoid bone which has the same degree of movement as that of the elbow which is found in humans thereby making it correct.

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Protons, neutrons and electrons that carbon-14 have if it has a neutral charge is 6 electrons, 8 neutron, and 6 proton.

The total of an element's protons plus neutrons is that element's mass number. One atomic mass unit, or amu, roughly equals the weight of neutrons and protons. While atomic number equal to proton and electron.

The proton can be calculate as follows:

C−14 has atomic no = 6 and mass no = 14.

so

No of electrons = No of protons = atomic no = 6

No of neutron = mass no-atomic no = 14−6=8

Therefore,  Protons, neutrons, and electrons that carbon-14 have if it has a neutral charge is 6 electrons, 8 neutron, and 6 proton.

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Answer:

the food chain you mean

Explanation:

pollution than mosquitoes then alligators

Answer: The correct option is 1 mole of acetic acid was required for 2 moles of sodium bicarbonate

Explanation:

We are given:

Average number of drops of sodium bicarbonate = 142

The chemical equation for the reaction of sodium bicarbonate and acetic acid in vinegar follows:

\(NaHCO_3+CH_3COOH\rightarrow CH_3COONa+H_2CO_3\)

From the stoichiometry of the reaction:

1 mole of sodium carbonate reacts with 1 mole of acetic acid in vinegar.

Hence, the correct option is 1 mole of acetic acid was required for 2 moles of sodium bicarbonate

Explanation:

The claim that hydrogen chloride (HCl) would be much stronger than nitric acid (HNO3) due to opposing dipole forces is incorrect.

Both HCl and HNO3 are strong acids, meaning that they dissociate completely in water to produce H+ ions. The strength of an acid is determined by the degree to which it dissociates in water. In other words, the stronger the acid, the more H+ ions it produces in water.

The dissociation of HCl and HNO3 in water can be represented as follows:

HCl + H2O → H+ + Cl-

HNO3 + H2O → H+ + NO3-

As we can see, both HCl and HNO3 produce H+ ions in water. Therefore, the strength of an acid cannot be solely determined by its dipole forces.

In addition, it's important to note that HCl is a much more volatile and corrosive acid than HNO3. It can cause severe respiratory and skin irritation when it is inhaled or comes into contact with skin. Therefore, switching HNO3 for HCl could be dangerous and should not be done without proper precautions and expert knowledge

The statement "oxides of group 1a and 2a metals are basic (exception: beo is amphoteric)." is True.

Oxides of group 1a and 2a metals are generally basic, meaning they react with water to form solutions with a pH greater than 7. This is because these metal oxides have a tendency to donate electrons to water molecules, forming hydroxide ions (OH-) and cations of the metal. The resulting solution is basic due to the presence of hydroxide ions.

Beryllium oxide (BeO) is an exception because it is amphoteric, meaning it can react with both acids and bases. It can react with acids to form salts and with bases to form beryllate salts.

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Answer:

omgggggggg

Explanation:

help

Among the given options, asphalt has the least number of carbon atoms/molecules.

Asphalt is a dense and solid material composed mainly of large hydrocarbon molecules, primarily made up of carbon and hydrogen atoms. It contains a high proportion of carbon atoms but does not have as many individual molecules compared to the other options.

On the other hand, natural gas, gasoline, and jet fuel are all fuels derived from petroleum and consist of various hydrocarbon compounds. These fuels typically have a higher number of carbon atoms/molecules compared to asphalt.

Therefore, the correct answer is d. asphalt.

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Answer:

See the answer below

Explanation:

When a solution of iodine is mixed with a solution of tetrachloromethane, the mixture turns purple due to the formation of \(I_2(CCl_4)\).

Iodine solution dissolves in carbon tetrachloride solution (another name for tetrachloromethane) due to the fact that both solutions are similarly non polar in nature. The equation of the reaction is as shown below:

            \(I_2 + CCl_4 --> I_2(CCl_4)\)

The hydronium ion concentration of a solution with a pOH of 8.30 is 1.99 × 10−6 M.

The hydronium ion concentration of a solution with a pOH of 8.30 is 1.99 × 10−6 M. A pH scale measures the concentration of hydrogen ions in a solution. The pOH scale measures the concentration of hydroxide ions in a solution.The formula for calculating pOH is:

pOH = -log[OH-]pH + pOH = 14.00

In the given question, the pOH is 8.30, which means the pH is:

pH + pOH = 14.00pH

= 14.00 - 8.30

= 5.70

The concentration of H+ ions in a solution with a pH of 5.70 is given by:

pH = -log[H+]5.70

= -log[H+]H+

= 10⁻⁵.70H+

= 1.99 × 10⁻⁶

The concentration of hydronium ions is the same as the concentration of hydrogen ions in an aqueous solution; thus, the hydronium ion concentration of a solution with a pOH of 8.30 is 1.99 × 10−6 M. Answer: b. 1.99 × 10−6

The hydronium ion concentration of a solution with a pOH of 8.30 is 1.99 × 10−6 M.

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pOH of a solution is used to indicate the acidity of the solution, where lower values indicate higher acidity. If the pOH of a solution is known, it is easy to calculate the hydronium ion concentration using the formula given below.

The formula for calculating hydronium ion concentration from pOH is as follows:$$[H_3O^+]=10^{-pOH}$$Where,$$pOH=-\log[OH^-]$$$$[OH^-]=10^{-pOH}$$Therefore,$$[H_3O^+]=10^{-pOH}$$Given that the pOH of a solution is 8.30. So,$$[OH^-]=10^{-pOH}=10^{-8.3}=5.01×10^{-9}M$$Therefore, $$[H_3O^+]=\dfrac{K_w}{[OH^-]}=\dfrac{10^{-14}}{5.01×10^{-9}}=1.99×10^{-6}M$$So, the answer is b. 1.99 × 10−6 M.

Therefore, option B is the correct answer.

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Answer:

A

Explanation:

hope this helps you have a good day

Answer:

The concentration of hydrogen peroxide decomposes over time.

Explanation:

The concentration of hydrogen peroxide decomposes over time.

It is a chemical compound whose formula is \(\rm H_2O_2\)

It is a liquid with pale blue and viscous composition.

The uses of hydrogen peroxide are sanitizing, disinfectant, etc.

It decomposes into water and oxygen, by breaking oxygen-oxygen bonding.

Thus, the concentration of hydrogen peroxide decomposes over time.

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Answer:

To determine the classification of the second solution, we need to compare the amount of solid dissolved in it to the amount that can be dissolved in water at that temperature.

From the first solution, we know that 36.8 g of the solid can dissolve in 200 mL of water. To convert this to g/mL, we divide 36.8 g by 200 mL to get 0.184 g/mL.

Using this value, we can calculate the maximum amount of solid that can dissolve in 100 mL of water:

0.184 g/mL x 100 mL = 18.4 g

Since the second solution was made by dissolving 19.1 g of the solid in 100 mL of water, it is a supersaturated solution.

Answer:

A

Explanation:

You can see the top part looks kinda like methane, and the bottom part looks like hexane.

Answer:

A is correctvia A P E x

Explanation:

The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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Answer:

D.Metallic

Explanation:

The metallic model is often characterized as a "sea of electrons". This is because the electrons delocalize from the ion's orbitals, allowing them to roam freely around the substance. This is what the model is showing.

If this helped, a brainliest would be greatly appreciated!

Answer:

yes it does

Explanation:

because the ratios on the reactants and products are equal

The reaction 2Na(s) + Cl₂(g) → 2NaCl(s) obeys the law of conservation of mass.

Yes, this reaction obeys the law of conservation of mass. The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is only rearranged.

In the given reaction, we have 2 sodium atoms (Na) on the left side and 2 sodium atoms (Na) on the right side. Similarly, we have 2 chlorine molecules (Cl₂) on the left side and 2 chlorine atoms (Cl) on the right side. Therefore, the number of atoms of each element is balanced on both sides of the reaction.

Additionally, the total mass of the reactants (2Na + Cl₂) is equal to the total mass of the product (2NaCl). The coefficients in the balanced equation represent the stoichiometric ratios, ensuring that the mass is conserved.

Hence, the reaction 2Na(s) + Cl₂(g) → 2NaCl(s) obeys the law of conservation of mass.

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The gravitational potential energy (GPE) of a 1 kg fish positioned 0.5 meters above the ground is 4.9 joules (J).

What is Gravity?

Gravity is a fundamental force of nature that causes objects with mass or energy to be attracted to one another. It is the force that gives weight to physical objects and determines how objects interact with each other due to their mass. Gravity is responsible for the motion of celestial bodies, such as planets, stars, and galaxies, and it plays a crucial role in the structure and evolution of the universe.

GPE = mgh

where:

Given the information provided:

Mass of the fish (m) = 1 kg

Height above ground (h) = 0.5 meters

Acceleration due to gravity (g) = 9.8 m/\(s^{2}\)

Plugging these values into the formula, we get:

GPE = (1 kg) x (9.8 m/\(s^{2}\)) x (0.5 m)

GPE = 4.9 J

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Answer:

Explanatiojhuojn

Answer:

B) A person activates a cold pack by hitting it against a surface.

C) A rechargeable battery is plugged in to charge.

D) Heat is used to separate a compound into its elements.

Explanation:

Chemical reactions that absorb energy are called endothermic reactions. Endothermic reactions absorb energy in the form of heat, light, or electricity, which causes the temperature of the system to decrease.

A) Plants use sunlight and atmospheric gases to make food through photosynthesis, which is an endothermic reaction that absorbs energy in the form of light.

B) A person activates a cold pack by hitting it against a surface, which triggers an endothermic reaction that absorbs heat from the surroundings, causing the cold pack to become cold.

C) A rechargeable battery is plugged in to charge, which involves an endothermic reaction that absorbs electrical energy, converting it into chemical energy that is stored in the battery.

D) Heat is used to separate a compound into its elements through heating, which is an endothermic reaction that absorbs heat from the surroundings, causing the temperature of the system to decrease.


ALLEN

Answer:

A.electric

Explanation:

electric is very useful in ingines

Answer: A.

Explanation: