The mass of an object is 500.25g and its volume is 10.05cm³. What is its density?

(10 points)

frutty [35]

hope it helps

limestone layers

3 0

3 years ago

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PLEASE HELP!<br> an element with 8 protons and 10 neutrons

leva [86]

Answer:

oxygen ion O2-

Explanation:

because it has 8 protons and gave gained 2 electron so O2-.

6 0

3 years ago

In a particular experiment, equal moles of H2(g) at 1.00 atm and Br2(g) at 1.00 atm were mixed in a 1.00 L flask at 25°C and all

Inessa [10]

Answer:

∆S = -348.3Jmol^-1 K^-1

K = 4

∆G ~= - 3435.3JK^-1mol^-1

Explanation:

H2 (g) + Br2(g) ----->2HBr(g)

x x 2x. Before eq

Given that ∆H(reaction) =103.8KJ/mol

and that At equilibrium the number of hydrogen molecules found is;

1.10 × 10¹³

Therefore we can say

Number(H2 molecules = Number (Bromine molecules)

And according to the reaction ratio, Number(HBr molecules) = 2 × 1.10 × 10¹³

T= 25°C = 273 + 25 = 298K

∆H = T∆S............(1)

∆S = ∆H/T

∆S =( -103.8KJ/mol/)/298K

∆S = - 0.3483KJmol^-1K^-1

∆S = -348.3Jmol^-1 K^-1

K = [HBr]²/[H2][Br2]

K = [2×1.10 × 10¹³]²/[1.10× 10¹³][1.10×10¹³]

K = (2.20)² ×10^26/[1.21 × 10^26]

K = 4.84/1.21

K = 4

∆G = -RTlnK = -2.303RTlog10(K)

Where R is the universal gas constant; R = 8.314JK^-1mol^-¹

∆G = - 2.303 ×8.314 × 298 × log(4)

∆G ~= - 3435.3JK^-1mol^-1

4 0

3 years ago

A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sleds potential energy

wel

Answer:

$\boxed {\boxed {\sf882 \ Joules}}$

Explanation:

Potential energy can be found by multiplying the mass by the height by the gravitational acceleration.

$PE=mgh$

The mass is 45 kilograms. The height is 2 meters. The gravitational acceleration on Earth is 9.8 meters per seconds squared.

$m=45 \ kg \\h= 2 \ m \\g=9.8 \ m/s^2$

Substitute the values into the formula.

$PE=45 \ kg * 2 \ m * 9.8 m/s^2$

Multiply.

$PE=441 kg*m/s^2*2 \ m$

$PE= 882 \ kg *m/s^2 *m$

1 kg*m/s^² is equal to 1 Newton (N). Substitute N in for kg*m/s²

$PE=882 \ N*m$

1 Newton meter (N*m) is equal to 1 Joule (J). Our current answer is equivalent to 882 Joules.

$PE= 882 \ J$

The sled's potential energy is 882 Joules.

8 0

3 years ago

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Most of our discussion of transition metals has focused around them becoming positively charged ions. However, many of the trans

Katen [24]

Answer:

Explanation:

Copper(II) ion Iron and copper are an examples of transition metals, which are most likely to form anions with a change of -1.

The transition elements are metals that form cations when they react but the situation is a bit more complex. Many transition elements are able to form more than one cation because they have a partially filled d-subshell that is just slightly lower in energy than the outer s subshell. When a transition metal forms a positive ion, it always loses electrons from its outer s subshell first. Once these are gone, any further electron loss takes place from the partially filled d subshell. Iron is a typical example.

Its electron configuration is Fe [Ar]3d⁶4s²

When iron reacts, it loses its 4s electrons fairly easily to give Fe²⁺. But because the 3d subshell is close in energy to the 4s, it is not very difficult to remove still another electron to give Fe³⁺.

Fe³⁺ [Ar]3d⁵

Because so many transition elements are able to form ions in a similar way, the ability to form more than one positive ion is usually cited as one of the characteristic properties of the transition elements. Frequently, one of the ions formed has a 2+ charge, which arises from the loss of the outer two s electrons. Ions with larger positive charges result when additional d electrons are lost.

6 0

3 years ago