please help me i would greatly appreciate it.. 50 points and will mark brainliest

It is important to consider shedding when assessing the potential risks associated with biohazard experiments involving research animals, and to take appropriate precautions to minimize the risk of exposure to these hazards.True.

Shedding of biohazards from research animals is an important factor to consider when evaluating the risk of conducting experiments involving these animals.

Biohazards are infectious agents or biological materials that can pose a threat to human health, animal health, or the environment. The risk of exposure to biohazards can be influenced by a variety of factors, including the route of transmission and the amount of the infectious agent or biological material present.

Shedding refers to the release of infectious agents or biological materials from animals into the environment, which can increase the risk of exposure to these hazards.

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The largest atom will be the one with the greatest number of protons and neutrons. To know which one of them is, we have to compare molecular masses and the greatest one will be the one of the largest atom.

From the given, iodine is the element with the greatest molecular mass, it means that this is the element with the largest neutral atom.

The answer is iodine.

Answer:

Reproducible by other scientists

The personal opinion of the scientist

Using vanable conditions for each test

Explanation:

I think it is

K2SO4?

Answer:

1 And 2 are soluble in water

The balanced titration reaction for the given reaction involving 0.0100 M Sn2+ in 1 M HCl with 0.0500 M Tl3+ is as follows:

2 Sn2+ (aq) + 3 Tl3+ (aq) → 2 Sn4+ (aq) + 3 Tl+ (aq)

The balanced titration reaction for the titration of 20.00 ml of 0.0100 m Sn2 in 1 m HCl with 0.0500 m Tl3 resulting in the formation of Sn4 and Tl can be written as:

2 Sn2+ + 2 Tl3+ + 2 H+ → 2 Sn4+ + 2 Tl+ + H2

The Pt indicator electrode and the saturated Ag|AgCl reference electrode are used to monitor the titration process.

1. Identify the reactants: Sn2+ and Tl3+
2. Identify the products: Sn4+ and Tl+
3. Balance the charges: 2 Sn2+ ions have a total charge of +4, while 3 Tl3+ ions have a total charge of +9. To balance the charges, multiply Sn2+ by 2 and Tl3+ by 3.
4. Write the balanced equation: 2 Sn2+ (aq) + 3 Tl3+ (aq) → 2 Sn4+ (aq) + 3 Tl+ (aq)

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Water can wear down the earth's surface at scales that are large and small in size or short and long in duration by carrying away bits of soil and sand and slowly wash away the sediment.

Weathering is referred to as the breaking or wearing down of rocks as a result of certain factors such as rain, glacier etc. They also form cracks in the rocks after which disintegration sets in after a while.

Water as an important factor has the ability to wear down the earth's surface at scales that are large and small in size or short and long in duration which is known as erosion. It involves carrying away bits of soil and sand and slowly washing away the sediment which are therefore the ways in which it occurs and is the correct choice.

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Answer:

Explanation:

rift valleys are created when two tectonic plates diverge or move away from each other

mountians are created when two tectonic plates converge or move towards each other therefore the answer is rift valley

Answer: The frequency is 7.047 Hz. It comes under ultraviolet radiation

Explanation:

We know that v = λ x f ................. (1)

where v ⇒ velocity of the wave

f ⇒ frequency of the wave

λ ⇒ wavelength of the wave

Since we know that the given wave is electromagnetic radiation,

v = 3 x 10⁸ m/s

λ = 4.257 x 10^-9 m (Given)

Substituting in (1), we get

f = v / λ

f = 3 x 10^8 / 4.257 x 10^-9

f = 7.047 x 10^16 Hz

Since the frequency is in the order of 16, the given radiation is ultraviolet radiation

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A solution is defined as a mixture of two or more substances, usually, a solute and a solvent, and the difference between these two are in quantity, solute represents the smallest amount and solvent will represent the highest amount, and while you can have more than one solute, you can only have one solvent for a solution. Therefore the statement is true

The electronic configuration is used to explain the orbitals of an atom and it helps to determine the physical and chemical properties of the elements. The electronic configuration of zinc is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰. The correct option is C.

The distribution of electrons in the atomic orbitals is given by the electronic configuration. It is a standard notation in which all the electrons holding atomic subshells are arranged in a sequence. Each element has a unique electronic configuration.

The electronic configuration of an element can be written in two ways, in standard notation, and in condensed form. In the case of elements with larger atomic numbers, the electronic configuration becomes lengthy in standard notation. So in such cases condensed form is generally used.

In condensed form electronic configuration of zinc is [Ar] 3d¹⁰4s² and in standard form it is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰.

Thus the correct option is C.

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Dimethylhydrazine (CH₃)₂NNH₂ is a fuel used for the Apollo Lunar Descent Module, and N₂O₄ is the oxidant. During the reaction, H₂O, N₂, and CO₂ are produced.

The fuel and oxidizer were stored separately to prevent any accidental reaction before use. Once the engines were ignited, the dimethylhydrazine and N₂O₄ mixed and reacted, producing energy and the products mentioned above.

The fuel used in Apollo Lunar Descent Module was dimethylhydrazine (CH₃)₂NNH₂, whereas the oxidant was N₂O₄. The two substances were stored separately, and the reaction was initiated only when they were mixed. The reaction between the fuel and oxidant produced H₂O, N₂, and CO₂.

The reaction between dimethylhydrazine and nitrogen tetroxide was exothermic and highly energetic.The reason why dimethylhydrazine was chosen as the fuel is that it is highly flammable and can quickly produce large amounts of heat and energy when mixed with an oxidant.

This makes it an ideal fuel for rocket engines, especially those used in space exploration, where high-performance and efficiency are critical.

The reaction between dimethylhydrazine and nitrogen tetroxide is also highly stable and controllable, making it suitable for use in the Apollo Lunar Descent Module.

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Answer: Butane and benzene are both compounds. They contain multiple elements bonded together in a specific ratio. Kerosene and gasoline are mixtures because they are combinations of several compounds. Oxygen is an element because it is made up of only one type of atom.

Explanation: im doin edge 2020

Butane and benzene both are compounds. Gasoline and kerosene both are mixture and oxygen are an element.

A substance can not be broken into simple components by any chemical reaction is called elements.

A substance is from a combination of two or more different chemical elements is called compound.

Butane (C4H10) and benzene(C6H6) are both compounds. They contain multiple elements like carbon and hydrogen bonded together in a certain ratio.

Kerosene is a combination of hydrocarbons and basically it is made up of aromatic hydrocarbon and gasoline is a mixture of hydrocarbons, additives and blending agent so kerosene and gasoline both are mixtures.

Oxygen is an element because it is made up of only one type of atom.

Butane and benzene both are compounds. Gasoline and kerosene both are mixture and oxygen are an element.

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Answer:

explain question please

Explanation:

Answer:

The sum of the kinetic energies and potential energies of all of the molecules in a substance is called the thermal energy of the substance.

A glacier moving a boulder is an example of  erosion.

There are two basic ways that glaciers generate erosion: pulling and abrasion. A glacier picks up boulders and other sediments through the process of plucking. They sink to the glacier's base and are swept away by the moving ice. A glacier scrapes the underlying rock through the process of abrasion.

The process of a glacier scraping underlying rock is called abrasion. A glacier's sides and bottom include silt and boulders that have been frozen in the ice and function as sandpaper. They destroy the rock. They might also leave dings and grooves that indicate the glacier's motion.

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Answer:

A

Explanation:

The given chemical reactions include decomposition and double displacement reactions.

A decomposition reaction is characterized by a single reactant breaking down into two or more components. In the first reaction, 2NH3 H2SO4, the reactant ammonia (NH3) and sulfuric acid (H2SO4) decompose to form ammonium sulfate ((NH4)2SO4). This reaction fits the definition of a decomposition reaction because the reactant breaks down into two different compounds.

Similarly, in the second reaction, 3Pb2H3PO4 ⟶ 3H2 Pb3(PO4)2, the reactant lead(II) hydrogen phosphate (Pb2H3PO4) decomposes to form water (H2) and lead(II) phosphate (Pb3(PO4)2). Again, this reaction qualifies as a decomposition reaction as the reactant breaks down into two different compounds.

In the third reaction, 2 NO2 ⟶ 2O2 N2, the reactant nitrogen dioxide (NO2) decomposes to form oxygen gas (O2) and nitrogen gas (N2). This reaction follows the definition of a decomposition reaction, as the reactant breaks down into two different compounds.

Lastly, the fourth reaction, 2NaBr Ca(OH)2 ⟶ CaBr2 2NaOH, is a double displacement reaction. In this reaction, the sodium bromide (NaBr) and calcium hydroxide (Ca(OH)2) react to form calcium bromide (CaBr2) and sodium hydroxide (NaOH). This reaction involves the exchange of ions between the reactants, leading to the formation of two different compounds. It does not fall under the category of a decomposition reaction.

Among the given chemical reactions, the first three reactions are examples of decomposition reactions. These reactions involve a single reactant breaking down into two or more components, resulting in the formation of different compounds. The fourth reaction is a double displacement reaction, where the reactants exchange ions to form two different compounds.

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Assume that every gas in the list will act perfectly. Using the mole fraction of O2 and the specified pressure, the partial pressure of O2 may be computed (P).

What is specified?

The following diagram illustrates the mathematical link between partial pressure of oxygen (P1) and oxygen mole fraction (X1):

P₁=X₁P

By dividing the total number of moles of gases (0.76 + 0.18 + 0.031 + 0.026) by the number of moles of O2 (0.18 mol), it is possible to determine the mole fraction of O2 as follows:

X₁= 0.18 / (0.76+0.18+0.031+0.026)= 0.1805

In this manner, the partial pressure of O2 (P1) is determined:

P1=0.1805x739mmHg, or 133.4mmHg

According to the estimate above, the partial pressure of oxygen is almost equal to 130 mm Hg. As a result, option C is the best one.

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Answer:

B) The liquid solution changed color.

Explanation:

It would be B because, first of all, it makes the most sense. Also, with all the chemicals, it's most likely the liquid would change color.

Answer:

B) the liquid solution changed color

Explanation:

I did the test.

2.40 ×10²⁴ molecules are there in 4.00 moles of glucose, C₆H₁₂O₆. A molecule is a collection of at least two atoms.

According on the context, the word can or cannot encompass ions that meet this requirement. A molecule is a collection of at least two atoms bound together by the attractive forces called as chemical bonds.

When speaking of polyatomic ions, the difference between them and ions is frequently ignored in the fields of quantum theory, organic chemistry, especially biochemistry.

number of molecule = number of moles ×  6.022×10²³

                                  = 4×  6.022×10²³

                                 = 2.40 ×10²⁴ molecules

Therefore, 2.40 ×10²⁴ molecules are there in 4.00 moles of glucose, C₆H₁₂O₆.

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To determine the amount of water and methane needed, we can set up a system of equations based on the desired composition of the mixture. you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

Let's assume x represents the number of gallons of water and y represents the number of gallons of methane. We have the following information: The total volume of the mixture is 90 gallons: x + y = 90. The mixture should be 60% methane: (y / (x + y)) * 100 = 60. Simplifying the second equation: y / (x + y) = 0.6. Now we can solve the system of equations: From equation 1, we can express x in terms of y: x = 90 - y. Substituting this into equation 2: y / ((90 - y) + y) = 0.6. Simplifying further: y / 90 = 0.6. Solving for y: y = 0.6 * 90. y = 54. Now we can find x using equation 1: x = 90 - y. x = 90 - 54. x = 36. Therefore, you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

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Answer:

Venus

Explanation:

From the sun outwards is   Mercury   Venus  Earth  and then Mars

The net ionic equation for the reaction between aqueous solutions of NaCl and AgNO3 is:

NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s)

The above reaction is double displacement reaction. Ag⁺ ions from AgNO3 react with Cl⁻ ions from NaCl to form a precipitate of AgCl. On the other hand, Na⁺ ions from NaCl combine with NO3⁻ ions from AgNO3 to produce the soluble salt NaNO3(aq).

The balanced chemical equation for the given double displacement reaction is as follows:

NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s)

The ionic equation for the reaction as follows : Na⁺(aq) + Cl⁻(aq) + Ag⁺(aq) + NO3⁻(aq) → Na⁺(aq) + NO3⁻(aq) + AgCl(s). The net ionic equation for the given reaction can be obtained by eliminating spectator ions from the ionic equation. Spectator ions are those ions which are present on both sides of the equation and don't participate in the reaction.

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Answer:

313.2 g of \({K_{2} }S O_{4}\)  must be added to 1.20 liters of water to produce a 1.50 molar solution.

Explanation:

What is molarity?

According to the given question,

Solution :

∴ Number of moles of solute, here, \({K_{2} }S O_{4}\)

= molarity x volume of the solution

= 1.20 x  1.50 = 1.8

∴ Mass of 1.8 moles of \({K_{2} }S O_{4}\) = 1.8 x molar mass of   \({K_{2} }S O_{4}\)  

Now the molar mass of \(K_{2} SO_{4}\)

= (Gram atomic mass of K x 2) + (Gram atomic mass of S) + (Gram atomic mass of O x 4)

= (39x2) + 32 + (16 x 4) g

= 174 g.

∴ Mass of 1.5 moles of \({K_{2} }S O_{4}\)

= 1.8 x molar mass of   \({K_{2} }S O_{4}\)  

= 1.8 x 174 g

= 313.2 g.

Thus, 313.2 g of \({K_{2} }S O_{4}\)  must be added to 1.20 liters of water to produce a 1.50 M solution.

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The liquid with a total mass of 88.30 grams and a volume of 165.0 milliliters has a density of: 0.5351 g/ml

To solve this problem the formula and the procedure that we have to use  is:

d = m/v

Where:

Information about the problem:

Applying the density  formula we get:

d = m/v

d = 88.30 g/165.0 ml

d = 0.5351 g/ml

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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Answer: The eight phases are, in order, new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter and waning crescent.

Explanation:

Answer:

new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter and waning crescent.