____________________ viewed thin slices of cork and called them cells

Answers

Answer 1

Answer: Robert Hooke - is the answer

Related Questions

Which choice below would affect the rate of reaction in the opposite way from the other four? a. Cool the reaction down b. Add a catalyst c. Decrease the pressure d. Use larger pieces of solid reactants e. Decrease the concentration of the reactants
Atoms of Group 6 of the Periodic Table are most likely to form ions with
A chemical reaction has two elements as reactants. Which type of reaction might occur?
Given the balanced equation:AgNO3(aq) + NaCl(aq) → NaNO3(aq) + AgCl(s) This reaction is classified as
Which equation represents a decomposition reaction?(1) CaCO3(s) ==>CaO(s) + CO2(g) (2) Cu(s) + 2AgNO3(aq) ==>2Ag(s) + Cu(NO3)2(aq) (3) 2H2(g) + O2(g) ==>2H2O(l) (4) KOH(aq) + HCl(aq) ==>KCl(aq) + H2O(l)

Which atom in the ground state requires the least amount of energy to remove its valence electron?(1) lithium atom (2) potassium atom (3) rubidium atom (4) sodium atom

Answers

Answer:

Rubidium (Rb)

Explanation:

Ionization Energy is defined as, "the minimum energy required to knock out or remove the valence electron from valence shell of an atom".

Trends in Periodic table:

Along Periods:

Ionization Energy increases from left to right along the periods because moving from left to right in the same period the number of protons (atomic number) increases but the number of shells remain constant hence, resulting in strong nuclear interactions and electrons are more attracted to nucleus hence, requires more energy to knock them out.

Along Groups:

Ionization energy decreases from top to bottom along the groups because the number of shells increases and the distance between nucleus and valence electrons also increases along with increase in shielding effect provided by core electrons. Therefore, the valence electrons experience less nuclear attraction and are easily removed.

Conclusion:

Given elements belong to same group hence, Rubidium present at the bottom of remaining elements will have least ionization energy due to facts explained in trends of groups above.

A gas in a rigid container at 25°C has a pressure of 0.96 atm. A change in temperature causes the pressure to increase to 1.25 atm. What is the new temperature of the gas?a...–44.2°C

b....32.6°C

c....115°C

d...388°C

Answers

Gay-Lussacs law states that pressure of a gas is directly proportional to temperature when the volume is kept constant

P / T = k

where P - pressure , T - temperature in kelvin and k - constant

$(P1)/(T1) = (P2)/(T2)$

where parameters for the first instance are on the left side of the equation and parameters for the second instance are on the right side of the equation

T1 - 25 °C + 273 = 298 K

substituting the values in the equation

$(0.96 atm)/(298 K)= (1.25 atm)/(T2)$

T2 = 388 K

temperature in celcius - 388 K - 273 = 115 °C

answer is C. 115 °C

Question: A gas in a rigid container at 25Â°C has a pressure of 0.96 atm. A change in temperature causes the pressure to increase to 1.25 atm. What is the new temperature of the gas? a...â€“44.2Â°C b....32.6Â°C c....115Â°C d...388Â°C Answer: Answer is c....115Â°C.

Enter the the ksp expression for the solid ab2 in terms of the molar solubility x.

Answers

The Ksp Expression for the given solid in molar solubility terms is; Ksp = 4x³

What is the expression of Molar Solubility?

Ksp is simply defined as solubility product constant and it is the equilibrium expression for the dissolving of a solid.

Now, the solid ab₂ dissolved as shown in the formula;

ab₂(s) → a(aq) + 2b(aq)

Thus, the equilibrium constant is;

Ksp = ([a][b]²)/[ab₂]

Now, since the solids are not put into the equation as a result of not having enough concentration, it can be simplified to;

Ksp = [a][b]².

Now, Molar solubility another term for molarity and as such it means we will say; x = a

Since b = 2x, there is twice the amount of b than a and as such we can write a and b in terms of x to get;

Ksp = [x][2x]² = 4x³

Read more about Molar Solubility at; brainly.com/question/9732001

Ksp is the equilibrium expression for the dissolving of a solid. The solid ab2 dissolved with the formula ab2(s)-->a(aq)+2b(aq) so the equilibrium comstant is K=([a][b]^2)/[ab2] and since solids are not put into the equation due to the fact that solids don't really have a concentration, it simplifies to K=[a][b]^2. Since Ksp is is how much solute can dissolve at equilibrium Ksp=[a][b]^2. Molar solubility is just another way of saying molarity so if you make x=a you know that b=2x since there is twice the amount of b than a. With those values for a and b in terms of x you can make Ksp=[x][2x]^2 which means that Ksp=4x^3. I hope that helps. Let me know if anything is unclear.

Assuming constant pressure and temperature, how many moles of gas have been added to the initial 3 moles of gas when the volume increases from 2.0 to 4.0 liters?1.5 moles

2 moles

3 moles

6 moles

Answers

Answer:

Moles of gas added = 3 moles

Explanation:

Given:

Initial volume of gas, V1 = 2.0 L

Initial moles of gas, n1 = 3 moles

Final volume, V2 = 4.0 L

To determine:

The moles of gas added to bring the final volume to 4.0 L

Explanation:

Based on the ideal gas equation

$PV = nRT$

where P = pressure, V = volume ; n = moles of gas

R = gas constant, T = temperature

At constant P and T, the above equation becomes:

V/n = constant

This is the Avogadro's law

Therefore:

$(V1)/(n1) = (V2)/(n2) \n\nn2 = (V2)/(V1) * n1 = (4.0 L)/(2.0L) * 3 = 6 moles$

The final number of moles of gas = 6

Thus, moles added = Final - Initial = n2 - n1 = 6-3 = 3 moles

We first assume that the gas is ideal which is a safe assumption to approximate the answer to the problem. Then we need to know the ideal gas equation and that is:

PV=nRT
where
P- pressure
V- volume
n-number of moles-
R- ideal gas constant
T-temperature.

Since we know that P, T and V are constant, rearranging the equation would lead to:

P/TR = n/V or the ratio of the moles of gas and volume is constant.

(3moles)/2L = (3+x)/4L
where
x is the additional moles.

Solving for x = 3 moles.

Ammonia is an important ingredient in many fertilizers. The main process by which ammonia is made is the Haber process. In this process, nitrogen gas and hydrogen gas are reacted to form ammonia at high temperatures. Which of the following most likely explains why this reaction is carried out at high temperature?Ammonia is unstable at room temperature.
High temperatures increase the activation energy of the reaction.
High temperatures make the gas molecules move more quickly.
The reaction becomes exothermic at high temperatures.

Answers

The best answer is "High temperatures increase the activation energy of the reaction."

The Haber process is an exothermic reaction at room temperature. This means that the reaction actually favors the reverse reaction, especially when the temperature is increased. So why increase the reaction temperature?

The reason for this is that nitrogen is a very stable element. Therefore, more energy is needed to overcome the slow rate of reaction. So the reaction temperature must be low enough to favor a forward reaction, but high enough to speed up the reaction.

this is wrong do not put this if your with FLVS

the correct answer is C i got 100% on it

Can someone pls help indicate the number of significant figures with these numbers: 34g, 564 l, 19.3 mm, 23.45 mg, 101 km, and 3400 g

Answers

The concept of significant figures are mainly used by scientist and engineer to know the significance of digits in a measurement. Therefore, significant figures gives an idea about the digits that are necessary to indicate the experimental value.