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4. Which of the following is not a characteristic of igneous rocks? (1 point)
Igneous rocks are formed when molten rock cools and hardens.
Igneous rocks have crystal grains.
Igneous rocks are larger in size because the rock cooled more slowly after the hot lava came out from the ground.
Igneous rocks have distinct layers that represent the time period when sediments were being deposited in them.

Answer:

[tex]\huge\boxed{\sf Mass = 726.96\ g}[/tex]

Explanation:

In the reaction:

For 2 moles of Na, 1 mol of H₂ is produced

At STP,

1 mol of H₂ = 22.4 L/mol molar value

Converting 354 L to moles:

= volume / molar value

= 354 / 22.4

= 15.8 moles

We already know that:

1 mol of H₂ ↔ 2 moles of Na

So,

15.8 moles of H₂ ↔ 15.8 × 2 moles of Na

15.8 moles of H₂ ↔ 31.6 moles of Na

So, to produce 15.8 moles of H₂ (354 L), we need 31.6 moles of Na.

Converting 31.6 moles of Na into mass:

Mass = moles × molar mass

Mass = 31.6 × 23

Mass = 726.96 g

[tex]\rule[225]{225}{2}[/tex]

The percent yield of the given reaction when substance r reacts with compound xy to produce 47.0 g of compound rx is 83.9%.

Percent yield of any reaction will tells about the loss in the production of the propduct in terms of percentage by comparing the standard yield.

Percent yield will be calculated as:

% yield = (actual yield / theoretical yield) × 100

Given actual yield = 47g

Given theoretical yield = 56g

On putting tese values on the above equation, we get

% yield = (47/56) × 100 = 83.9%

Hence, correct option is (3) i.e. 83.9%.

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Answer:

83.9%

Explanation:

Which device is designed to produce mechanical energy?

Well, mechanical energy is the sum of potential and kinetic energy. Kinetic energy is a unit of energy in which is the reason why an object does movement, while potential energy is another unit of energy in which is the reason why an object doesn't move, or stops. While you can stop a fan or a lamp, it isn't automatic. It's manually. So the answer is (4) an oven because mechanical energy happens automatically, not manually, or for a greater reason.

Yes. All matter is made of atoms in some way. Even the smallest crumbs are made of quadrillions of atoms. The number of atoms is simply mind boggling.

1 quadrillion = 1,000,000,000,000,000

There are 15 zeros in that number. It might be better to express it as

1 quadrillion = 1.0 * 10^15

Scientific notation compacts large numbers such as this to make it more readable, and allow for faster writing.

Answer:5 causes of diseases or infectious disease is

1.bacteria

2.indirect/direct contact with a sick person or contaminated item

3.viruses

4.food contamination

5.not washing hands with soap or water/ not getting vaccinated/not getting certain vaccines

(hope this is helpful)

Explanation:

Answer: I think you did it the right way-I think

Explanation:

Hope that helps!

Name: King

Answer:

10. Embryology is the branch of biology and medicine concerned with the study of embryos and their development.

11. I think the answer is, Both humans and whale embryos have a tail and a backbone (I'm not sure).

12. Basilosaurid, any member of the family Basilosauridae, an early group of whales that lived from the middle Eocene to the late Oligocene Epoch (about 41 million to 23 million years ago).

13.  Protocetids had long snouts, large eyes, and their nasal opening was farther caudally than in earlier archaeocetes.

14. Two ways we know that Maiacetus was a whale re:

1) Their skeletons have all been found among fossils of sea-creatures which suggests they lived in the sea.

2) Their hip bones were strong enough to walk on land, but their short legs combined with long flat fingers and toes suggest they would have had difficulty walking.

15. The name Maiacetus means Mother Whale. Maiacetus is significant because of how well the skeletons were preserved.

Hope this helps! :D

Answer:

Which of these sentence is NOT true regarding heating a substance?

Your answer is D.The mass increases

Answer:

High pressure and low temperature, because particles are forced closer together and moving slower, so the volume of the particles is less significant

Answer:

A gas at very low volumes, when gas particles are very close together

A gas at very low temperatures, when gas particles have very little kinetic energy

A gas with highly polar molecules that have very strong inter-molecular forces

Explanation:

According to kinetic molecular theory:

a) Ideal gases have large number of particles which were considered to be hard spherical objects.

b) these gas particles move randomly in a straight line.

c) the path of gas particles change when they collide with each other or walls of vessel.

d) there is no or negligible inter molecular interactions between the gas particles.

e) the inter molecular distances is much higher than the size of particles.

f) the gas particles occupy negligible volume of the vessel.

g) during collision of gas particles is perfectly elastic.

h) the average kinetic energy of particles is constant at a constant temperature. It varies directly with the temperature.

Answer:

a) compound

b)element

c)mixture

d)compound

Explanation:

Answer: beakers A and D

Explanation:

These two beakers have the lowest temperatures, meaning the particles move slower than the other two beakers.

Answer:

A and D

Explanation:

Answer:

1 mole of pencil = 6.02X1023 number of pencils

Explanation:

Answer:

10

Explanation:

because 4 for 2 is 8 and the one invisible in p for 2 is 2, adding the 2+ 8 Is 10 are the atoms of Magnesium.

The moles of diiodine is formed from the nitrogen triiodide is 0.0212 moles.

Relation between the moles and mass of any substance will be represented as:

n = W/M, where

n = moles

W = given mass

M = molar mass

Given chemical reaction is:

2NI₃ → N₂ + 3I₂

Moles of 5.58g of NI₃ will be calculated as:
n = 5.58g / 394.71g/mol = 0.0141 mole

From the stoichiometry of the reaction, it is clear that:
2 moles of NI₃ = produce 3 moles of I₂

0.0141 moles of NI₃ = produce 3/2×0.0141=0.02115 = 0.0212 moles of I₂

Hence option (4) is correct i.e. 0.0212 moles.

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Answer:

C

Explanation:

Right on edge 2022

Chemistry

Equation: Fe+CuCl2>FeCl2+Cu

PV=nRT

Explanation:

P- pressure

V- volume

n-moles

R- constant gas

T- temperature

Answer:

MgO

Answer: when the solar system settled into its current layout about 4.5 billion years ago, earth formed when gravity pulled swirling gas & dust in to become the third planet from the sun. like its fellow terrestrial planets, earth has a central core, a rocky mantle, & a solid crust.

Answer:

neutron, and the way I remember that is because NEUTron is NEUTral

Explanation:

proton are positive (both start with a 'p') and electrons are negative

Answer:

Hello! I am very sorry I do not know the exact answer to this but here is some information that may help!

Surface tension in water owes to the fact that water molecules attract one another, as each molecule forms a bond with the ones in its vicinity. This inward net force causes the molecules on the surface to contract and to resist being stretched or broken.

Explanation:

Again I am very sorry I could not give you the answer you were looking for. I hope the information above has helped you even a little! I am very sorry if this is not what you were looking for. Have a great rest of your day or night and good luck on your work!

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Answer:

B

Explanation:

Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.

Answer:

the answer might be 250g for the this question hope this helps

Explanation:

Since the solute is dissolved in ether, which has a freezing point of -116.3 °C, the freezing point of the solution will be:  -116.3 °C - 5.24 °C = -121.5 °C.

To solve this problem, we need to use the formula for freezing point depression:

ΔTf = Kf · m

where ΔTf is the change in freezing point, Kf is the freezing point depression constant of the solvent, and m is the molality of the solution.

Since the solute is a non-electrolyte, it does not dissociate in the solvent, so the number of particles in solution is the same as the number of moles of solute:

molality = moles of solute / mass of solvent (in kg)

First, we need to calculate the mass of ether in kg:

mass of ether = 500 g = 0.5 kg

Next, we can calculate the molality of the solution:

molality = 0.500 mol / 0.5 kg = 1.00 mol/kg

The freezing point depression constant for ether is 5.24 °C·kg/mol. We can now use this value and the molality to calculate the change in freezing point:

ΔTf = Kf · m = 5.24 °C·kg/mol · 1.00 mol/kg = 5.24 °C

Since the solute is dissolved in ether, which has a freezing point of -116.3 °C, the freezing point of the solution will be:

freezing point of solution = -116.3 °C - 5.24 °C = -121.5 °C

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Option C, mass would be same. Only the gravitational pull will be different

Answer:

There is no deacceleration.

Explanation:

Let's check relation between velocity and acceleration

[tex]\\ \rm\Rrightarrow a=\dfrac{dv}{dt}[/tex]

[tex]\\ \rm\Rrightarrow a\propto dv[/tex]

So as velocity graph is going up acceleration is going up

Those flat lines on graph shows constant acceleration .

Curve lines up shows instantaneous acceleration.

If the graph is going down then it can be deacceleration .

Note :-No F is present in graph

Answer:

Explanation:

The car decelerates steadily to a stop so the line showing the deceleration will be a straight line from point D.

D is at 60s so 10s from D will be 70s. The car stops so velocity will be zero.

Based on the above, the line should look something like in the attached picture.

Answer:

Explanation:

a )

5 gram of sulfuric acid in 100 gram of solution

volume of 100 gram of solution = 100 / 1.03 ml

= 97.08 ml = .097 L

5 gram of sulfuric acid = 5 / 98 moles = .051 moles

.051 moles in .097 L solution

molarity = .051 / .097 = .525 M .

b ) 55 gallon = 3.7854 x 55  L = 208 L

rate of flow = 82 L / min

time taken to fill the drum = 208 / 82 min = 2.536 min .

volume of sulfuric acid = 208 L

mass = volume x density = 208 x 1000 x 1.03 gram = 214.24 kg

214.24 kg = 214.24 x 2.2 lb = 471.33 lb

c )

cross sectional area = 3.14 x 3² = 28.26 cm²

rate of flow = 82 L / min = 82 x 1000 cm³ / min

= 82000 / 60  cm³ / sec = 1366.67 cm³ / s

velocity = 82 x 1000 / 1366.67 = 60 cm / s  = .6 m / s

length of pipe = 45 m

time taken = 45 / .6 = 75 s

Answer:  It is exhibiting retrogade motion.