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Answer: - 1.45 kJ

Explanation:

Using q  = m x C x (ΔT)

Given : m = 3.8 g  , C = 0.900 J/g°C,  = -(450-25)°C = -425°C  (Since final temperature is less than the initial, the sign is negative)

q = (3.8 g) x (0.900 J/goC) x ( -425 °C)

= -1453.5 J

= -1.45 kJ

Note that negative sign of q indicates that this much heat is released, when the metal cools down.

Water will move into the cell because of lower concentration of water inside the cell as compared to outside.

Water has a tendency to move across a membrane from a lower osmolarity to a higher osmolarity which means from higher concentration region to the lower concentrated region.

So we can conclude that water will move into the cell due to lower concentration of water inside the cell as compared to outside.

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Answer:

If you're from study island, the answer is D. Water will move out of the cell.

Explanation:

I got it on study island and this was right.

Answer:

The oceans are the very foundation of human life. life itself arose from the oceans. The oceans are vast, covering about 140 million square miles, some covering 72 percent of the earth's surface.

Explanation:

Answer:

The pathogen might not be recodnised by the host :)

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Answer:

I believe is the correct answer

Explanation:

hydrochloric

Answer:

Molarity=number of moles÷volume(L)

Grey basically is formed by combining black and white colors together.

In this case, one would have to explore other options.

The following color combinations can form grey:

By adjusting the other colors, variations of hue will be observed. It is to be noted that the Gizmo is unaccessible on this platform hence the general answer.

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Answer:

C

Explanation:

okay, you need to look at the structures of the particles of matter in the solid, liquid and gas.

you can refer to your coursebooks :)

correct where wrong please:)

Chemist prefer to use kipp’s apparatus for the production of hydrogen sulphide instead of woulf’s bottle because they produce gas without generating heat.

Kipp's appratus and woulf's bottle both are the laborartory appratus and used in the analytical process of any reactions.

Hydrogen sulphide gas will be produced in the laborartory by using both given appratus but we prefer the use of kipp's apparatus because in this apparatus small amount of gas is produced in the controlled heat condition by the reaction between the liquid sulphuric acid and solid iron sulphide.

Hence we prefer kipp's appratus as it produces gas without heat.

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Answer:

NaOH + HCI

Explanation:

yesssssssssssss

The east to west daily motions of stars, planets, the Moon, and the Sun are caused by the rotation of the Earth on its axis. The Earth and all the planets revolve around the Sun on circular orbits. This produces the change in constellations observed from one time of year to the next.

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Answer:

Ch4-Methane ( 5 atoms )

CO2- Carbon Dioxide ( 3 atoms )

H2O- Water ( 3 atoms )

2O2- Oxygen ( 2 atoms )

Answer:

As per Provided Information

Distance travelled by sound impulse through an aluminium rod is 1500 metres .

We have been asked to determine the time taken by the sound impulse to travel through aluminium rod .

As we know

Speed of sound in aluminium rod is 5100m/s .

Using Formulae

[tex] \boxed{\bf \: Time \: taken_{(Sound \: impulse)} = \cfrac{distance \: travelled \: by \: sound \: impulse}{speed \: of \: sound \: impluse}}[/tex]

Substituting the value and we obtain

[tex] \sf \qquad \longrightarrow \: Time \: taken_{(Sound \: impulse)} = \dfrac{1500}{5100} \\ \\ \\ \sf \qquad \longrightarrow \: Time \: taken_{(Sound \: impulse)} = \cancel\dfrac{1500}{5100} \\ \\ \\ \sf \qquad \longrightarrow \: Time \: taken_{(Sound \: impulse)} = 0.29 \: s[/tex]

Therefore ,

So, your answer is 0.29 s .

Answer:

C

Explanation:

The resulting temperature of a closed container that has a pressure of 2.35atm, and a volume of 1.2L, and contains 76.33g Cl2 is 31.8K.

The temperature of a given gas can be calculated by using the ideal gas law equation:

PV = nRT

Where;

no of moles of Cl2 = 76.33g ÷ 70.91g/mol = 1.08mol

2.35 × 1.2 = 1.08 × 0.0821 × T

2.82 = 0.088T

T = 2.82/0.088

T = 31.8K

Therefore, the resulting temperature of a closed container that has a pressure of 2.35atm, and a volume of 1.2L, and contains 76.33g Cl2 is 31.8K.

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Answer:

the answer for a is 2mol/dm3

Explanation:

n=0.2mol of NaOH

v=100cm3

[tex]v = \frac{100}{1000} \\ v = 0.1 {dm}^{3} \\ concentration = \frac{n}{v} \\ = \frac{0.2}{0.1} \\ = 2mol {dm}^{3} [/tex]

Answer:

In fact, the inhibitor and substrate don't affect one another's binding to the enzyme at all. However, when the inhibitor is bound, the enzyme cannot catalyze its reaction to produce a product. Thus, noncompetitive inhibition acts by reducing the number of functional enzyme molecules that can carry out a reaction.

The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH

Hydrolysis is a chemical reaction which water molecule break down one or more chemical bonds. This is use for substitution, elimination, and solubility.

Hydrolysis depend on the pH, solubility and chemical constituent of the substance.

Therefore, The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH

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Explanation:

because of blood pressure

Based on the research in Study 1, as the wavelength of light increases, the reflectance of Cyanide: C. increases, then decreases.

Wavelength is simply defined as the distance (in meters) between two (2) successive crests or troughs of a wave. Thus, wavelength refers to the horizontal distance between two adjacent crests or troughs of a wave.

Generally, there is a linear relationship between the wavelength of light and reflectance. Thus, as the wavelength of light increases, the reflectance of Cyanide in Study 1 increases, before it then decreases.

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Answer:

Palmas, because more energy is transferred from the sun directly to the surface and then from the surface to the air.

Explanation:

Hope this helps:)....if not then sorry for wasting your time and may God bless you:)

the question isnt clear where are the products ir the reactants like __ = ___ + ___

Answer:

When hydrochloric acid comes into contact with calcium carbonate, the following chemical reaction ensues: CaCO3 + 2HCl → CaCl + CO2 + H2O, which provides acid neutralization alongside the formation of byproducts

Answer:

C) liquid

Explanation:

edge 2023

Answer:

A Winter storm usually does not come with a warm fronthey warm front.

Explanation:

When the front passes over an area it means to change in the weather. Many. Many friends cause weather events such as rain thunderstorms gusty winds tornadoes and hurricanes.

Answer:

True

Explanation:

DNA can be extracted from bite marks, cigarette buds, postage stamps on envelopes, and envelope flaps for DNA analysis.

Answer:

false. a envelope is what the DNA evidence goes in

Explanation:

Answer:

The answer is C

Explanation:

unsaturated hydrocarbons have multiple carbon bonds

Unsaturated alkene  describes the molecule shown below as the atoms are attached by double bonds.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is  solid,liquid , gas consists of atoms . Each atom has a nucleus which is contains  protons and neutrons and shells in which the electrons revolve.

The protons are positively charged particles  and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged particles and hence the atom as a whole is neutral  particle and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not  change the chemical properties of the substances.

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Answer:

CuSO4 + Fe

Explanation:

this is because Cu will displace Fe from it's position

Answer:

The answer is Edema caused by the pathogen raises the body temperature. :)

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Tautomers are isomers composed of the same atoms but with different electronic and molecular structures. The most stable tautomeric form is attached.

Tautomery is a special case of isomery produced by the change in the position of one or more atoms in the molecule. This change in position modifies the molecular electronic distribution, and hence, the molecular structure.

In solution, isomeres called tautomers are in equilibrium, and the constant interconversion is called tautomerization. Both molecules have the same type and quantity of atoms.

In the proposed example, the product has the molecular formula C₁₀H₁₆O₃. Isomeric molecules must have 6C, 16H, and 3O. However, the distribution of these atoms varies, leading to a change in the product molecule structure.

In the attached files you will find an example. You should check if this is the same example as yours.  

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Answer:

emission spectroscope

Explanation:

The flame emission spectroscope is a scientific instrument based on flame testing.