What is A,B and C in the following picture?

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:

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

Chemistry

Equation: Fe+CuCl2>FeCl2+Cu

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:

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:

[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]

Answer:

A location that is humid, would most likely support a marsh ecosystem.

Explanation:

The Florida Everglades are an example of a marsh :)

"Marshes are a type of wetland ecosystem where water covers the ground for long periods of time. Marshes are dominated by herbaceous plants, such as grasses, reeds, and sedges."

Answer:

Melting, or fusion, is a physical process that results in the phase transition of a substance from a solid to a liquid. This occurs when the internal energy of the solid increases, typically by the application of heat or pressure, which increases the substance's temperature to the melting point.

Answer:

1 mole of pencil = 6.02X1023 number of pencils

Explanation:

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

Answer:

True

Explanation:

In a chemical reaction, bonds between atoms in the reactants are broken and the atoms rearrange and form new bonds to make the products.

Answer:

true

Explanation:

chemical reactions use reactants, to form products, and the process involves rearranging atoms :)

Magnesium or metal reacts with oxygen to produce magnesium oxide or metal oxide. The mass of oxygen needed to completely react with magnesium is 64 g.

Mass is the weight or the quantity of the substance that is estimated in grams and kilograms.

The balanced reaction can be given as:

[tex]\rm 2Mg + O_{2} \rightarrow 2MgO[/tex]

From the balanced reaction, 2 moles of magnesium and 1 mole of oxygen are required to produce 2 moles of magnesium oxide.

If 2 mol Mg requires 1 mol oxygen then, 4 mol Mg will need 2 mol of oxygen.

The mass of oxygen can be calculated as:

[tex]\begin{aligned}\rm mass &=\rm molar\; mass \times moles \\\\&= 32 \times 2\\\\&= 64 \;\rm gm\end{aligned}[/tex]

Therefore, option B. 64 gm of oxygen are required.

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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!

<3 <3 <3

Answer:

The substance occupy 961.54 cm³ space.

Explanation:

Given data:

Mass of substance = 750.00 g

Density of substance = 0.78 g/mL

How much space it occupy = ?

Solution:

The space occupy by the substance is equal to its volume. Thus we will calculate the volume by applying density formula. Which is actually the space cover by substance.

d = m/v

d = density

m = mass

v = volume

0.78 g/mL = 750.00 g/ v

v = 750.00 g/ 0.78 g/mL

v = 961.54 mL

1 mL = 1 cm³

v = 961.54 cm³

Thus substance occupy 961.54 cm³ space.

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:

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

Your answer is D.The mass increases

Answer:

a) compound

b)element

c)mixture

d)compound

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.

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: 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.

PV=nRT

Explanation:

P- pressure

V- volume

n-moles

R- constant gas

T- temperature

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: Silicon the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Silicon go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons.

Hope this helps! :)

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.

Answer:Some examples of the force of gravity include;

-The force that holds the gases in the sun.

-he force that causes a ball you throw in the air to come down again.

-The force that causes a glass you drop to fall to the floor.

-The force that keeps the Earth and all of the planets in line in the proper position in their orbits around the sun.

-The force that causes an apple to fall downward from an apple tree.

-he force that keeps you walking on Earth instead of floating away into space.

Answer:  It is exhibiting retrogade motion.