4. One of Dr. Birdley's boxes has a volume
of 240 cm^3 and a density of 15 g/cm^3.

The mass of the box is
a) 225 g
b) 265 g
c)3600 g
d) 32 g

Answer:

- The conjugate base of a weak acid is a strong base.

-  The conjugate base of a strong acid is a very weak base

Explanation:

The conjugate base of a strong acid is a very weak base, and the conjugate base of a weak acid is a strong base. These two statements are true.

It is a substance with the capacity to take a proton out of an extremely weak acid. In water, they can also entirely separate into its ions. Examples include sodium hydroxide and potassium hydroxide (KOH) (NaOH).

The stronger the acid and the weaker its conjugate base are, the higher the Ka. Similar to this, the stronger a material is as a base and the weaker its conjugate acid's acidity, the higher the Kb.

Bases provide a similar problem: a strong base is one that is completely ionized in solution. A weak base is one that is less than 100% ionized in solution. There aren't many strong bases, and any base that isn't on the list is.

Thus, The conjugate base of a strong acid is a very weak base, and the conjugate base of a weak acid is a strong base.

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Answer:

k = -0.006.

T₀ = 15 °C

Explanation:

Hola.

En este caso, considerando la gráfica mostrada en el archivo adjunto, podemos evidenciar que los datos dados se comportan de manera lineal, por lo que basado en la ecuación, T=k*h+To, podemos calcular la pendiente que basicamente es igual a k, tomando dos puntos en la gráfica:

[tex]k=\frac{12-13.5}{750-500}=-0.0006[/tex]

Además, el valor de la temperatura inicial se puede extraer de la tabla, dado que esta es cuando la altura es 0 m, es decir 15 °C.

¡Saludos!

Answer:

Cells have many structures inside of them called organelles. These organelles are like the organs in a human and they help the cell stay alive. ... Mitochondria are the power house of the cell and provide the cell with energy. Both plant and animal cells have mitochondria.

Explanation:

Answer:

Rutherford concluded from his metal foil experiments that most of an atom is empty space with a tiny, dense, positively charged nucleus at the center that contains most of the mass of the atom. He also concluded that the electrons orbit the nucleus like the planets orbit the sun

Explanation:

Answer:

A solid has mass and takes up space

Explanation:

[tex]19.87mol \times \frac{22.4lit}{1mol} = 445.088lit \: [/tex]

Answer:

The bottommost layer in core sample 1 and the topmost layer in core sample 2.

Explanation:

Correct me if im wrong :)

Answer:

I believe it is Gasoline

Explanation:

The best example of a chemical reaction that has a gas as a product is baking soda in vinegar.

A chemical reaction is one that involves the formation of a new product and is irreversible.

This means that a chemical reaction is characterized by the following:

The reaction between vinegar and baking soda will lead to the formation of gaseous products, hence, it is an example of chemical reaction.

Therefore, the best example of a chemical reaction that has a gas as a product is baking soda in vinegar.

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Answer:

yes because wet is water

Answer: Being a liquid, water is not itself wet, but can make other solid materials wet. Wetness is the ability of a liquid to adhere to the surface of a solid, so when we say that something is wet, we mean that the liquid is sticking to the surface of a material.

Answer:

Its density becomes greater.

Explanation:

If the mass of the object stays the same but the volume of the object decreases then its density becomes greater. ... If the volume of the object stays the same but the mass of the object increases then its density becomes greater.

By definition of density,  the density of an object if the volume increases, but the mass stays the same, will decrease.

You have to know that density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

In other words, the density of a material, be it liquid, chemical, or gaseous, is the ratio of its mass to its volume.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

And the higher the volume occupied by a given mass, the smaller the density.

Finally, the density of an object if the volume increases, but the mass stays the same, will decrease.

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Answer:

4. fact

5.fact

I think this is all fact no evidence

Answer:

C, organelles can all be different in an animal

Explanation:

Organelles DO perform a certain function for a cell,

Organelles ARE membrane enclosed structures,

and Organelles ARE separated from other parts of the cell

Answer:

Physical Properties of Metals :

Metals are lustrous, malleable, ductile, good conductors of heat and electricity. Other properties include: State: Metals are solids at room temperature with the exception of mercury, which is liquid at room temperature (Gallium is liquid on hot days).

Hope this helps! :D

Answer:

Photons of light from source X carry more energy than photons of light from source Y

Explanation:

According to Einstein's photoelectric equation, the kinetic energy of the emitted photoelectron depends on the energy of the incident photon and the work function of the metal.

For photoelectrons to be ejected from a metal surface, the energy of incident photon must be greater than the work function of the metal. If not, no electron is ejected.

The energy of photon X must be greater than the work function of the metal while the energy of photon Y is less than the work function of the metal. This brings us to the conclusion that the energy of photon X must be greater than that of photon Y.

Answer:

c

Explanation:

i got it right on edg2020

The specific heat of the metal with a mass of 100g that absorbed 2500 joules of energy is 0.33J/g°C

The specific heat capacity of a metal can be calculated by using the following expression:

Q = m × c × ∆T

Where;

c = Q ÷ m∆T

c = 2500 ÷ (100 × 74.8)

c = 2500 ÷ 7480

c = 0.33J/g°C

Therefore, the specific heat of the metal with a mass of 100g that absorbed 2500 joules of energy is 0.33J/g°C.

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Answer:

refigeration,coolant for nuclear reactants

Explanation:

used for cooling properties since it's boiling point being close to absolute zero.

The molarity of the Isopropanol solution is 1.68 M.

Molarity of any solution can be calculated as:

M = n/V, where

n = no. of moles

V = volume = 1,250mL = 1.250L

For this first we have to calculate the moles of Isopropanol (C₃H₈O), and it can be calculated as:

n = W/M, where

W = mass of C₃H₈O = 127 grams

M = molar mass of C₃H₈O = 60.1 g/mol

Moles of C₃H₈O = 127g / 60.1 g/mol = 2.1 moles

Now, we calculate the molarity of solution by using the above formula and by putting values as:

M = 2.1/1.250 = 1.68 M

Hence, 1.68 M is the molarity of the solution.

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Answer:

all u have to do is multiply

|| ▼ Answer ▼ ||

Option D. All the way to the left

|| ✪ Solution ✪ ||

Visible light sits in the region with ultraviolet (UV) to the left of the spectrum.

see the picture below :

The picture shows exactly where the visible light is located in the electromagnetic spectrum .

that is to the left of the ultraviolet radiation, and to the right of infrared (IR).

Hope this Helps! =)

If you have any queries please ask.

Explanation:

Let's consider sulphate radical, the chemical formula is given by SO42−. Here we can see there is a -2 charge on SO4, which means it has -2 valency. Now look at the option (a), phosphate can be written as PO43−. There is -3 charge on PO4, that means it has -3 valency.

Explanation:

molecular formula of sulphate ion is SO₄²⁻

and

the valency of sulphate ion is 2.

Answer:

Salt water

Explanation:

A. The mass of the oxygen gas collected is 0.317 g

B. The mass of potassium chlorate that decomposed is 0.81 g

The number of mole can be obtained as by using the ideal gas equation as illustrated below:

n = PV / RT

n = (0.973 × 0.25) / (0.0821 × 299)

n = 0.0099 mole

Thus the mass of oxygen collected can be obtained as follow:

Mass of oxygen = mole × molar mass

Mass of oxygen = 0.0099 × 32

Mass of oxygen = 0.317 g

Balanced equation

2KClO₃ —> 2KCl + 3O₂

From the balanced equation above,

3 moles of O₂ were obtained from 2 moles of KClO₃

Therefore

0.0099 mole of O₂ will be obtained from = (0.0099 × 2) / 3 = 0.0066 moles of KClO₃

Thus, the mass of KClO₃ that decomposed can be obtained as follow:

Mass = mole × molar mass

Mass of KClO₃ = 0.0066 × 122.5

Mass of KClO₃ = 0.81 g

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Answer:

100 Degrees C

Explanation:

Answer:

Photolysis and hydrolysis. These are two methods that can be used to break down a compound into simpler substances and smaller units.

Explanation:

Answer:

In a chemical reaction, equilibrium is achieved when the forward and reverse reactions occur at the same rate.

Equilibrium is influenced by the following:

1) pressure

2) temperature

3) concentration

Bear in mind that CATALYST HAS NO IMPACT ON THE EQUILIBRIUM; IT ONLY INCREASES THE RATE.

PRESSURE:

Only if the reaction's left side contains a greater number of molecules can the pressure be increased in order to boost yield. [tex]{e.g:N}_2+3H_2\rlhar2NH_3[/tex]

Thus, because the left side has four molecules and the right side has two, you should increase pressure to increase yield.

TEMPERATURE:

In order to increase yield, raise the temperature only in ENDOTHERMIC FORWARD reactions.

CONCERNTRATION:

Removing the formed product increases yield.

I hope this helps you

:)

In neutralization reactions involving acids and bases, the reactions are mostly double-replacement reactions.

Reactions involving acids and bases are known as neutralization reactions.

In these reactions, acids and bases exchange ions to form new products.

The exchange of ions is known as a double replacement reaction.

For example:

HCl + NaOH ------------. NaCl + H2O

In the above reaction, HCl and NaOH exchanged ions to become H2O and NaCl respectively.

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