if you can’t already tell by the amount of questions i do not understand chemistry lol, giving brainliest

Answer:

False

Explanation:

hi! sodium has one valence electron while magnesium has 2. this is because of their position on the periodic table. sodium is the first in the row, meaning it has one valence electron. magnesium is next to sodium on the periodic table, meaning it is second in the row and has two valence electrons. hope this helps!

Answer:

[tex] \huge{3.783 \times {10}^{ - 19} \: J}[/tex]

Explanation:

The energy of the wave can be found by using the formula

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question we have

E = 6.626 × 10-³⁴ × 5.71 × 10¹³

We have the final answer as

[tex]3.783 \times {10}^{ - 19} \: J[/tex]

Hope this helps you

Answer:

5. False

Explanation:

Drinking contaminated water causes jaundice

Answer:

160 g

Explanation:

5 x 32 = 160g, but if according to the periodic table u provided it would be 5 x 32.06

Answer:

160.3 g S

Explanation:

The part of the chemical reaction that is the Brønsted-Lowry base is BrO.

Bronsted-Lowry definition of a base and acid is as follows:

According to this question, the following chemical reaction is given:

BrO + H2CO3 → HCO3 + BrOH

In the above reaction, BrO is the compound that accepts the hydrogen ion (H+) to become BrOH, hence, BrO is the Bronsted-Lowry base.

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Answer:

Explanation:

Exothermic: the surrounds feel warmer. A wood fire stove is a good example of an exothermic reaction. You can feel the heat on your hands. It's exothermic.

Endothermic is exactly the opposite. The reaction takes place, but the heat comes from the surroundings. When you touch something that goes through an endothermic reaction, it feels much cooler.

This reaction, just by definition is endothermic.

Answer:

Relied on the use of power driven machinery

Explanation:

Its because the machines would increase the mass productivity of goods

[tex]\qquad[/tex][tex] \pink{\bf\longrightarrow { Molar \:mass \:of \:H₂O:-} }[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow 1\times +16[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow 18g[/tex]

[tex]\qquad[/tex]____________________

Let's calculate the number of moles present in 89g of H₂O.

[tex]\qquad[/tex][tex] \purple{\bf\longrightarrow { No \:of \:moles = \dfrac{Given \:mass}{Molar\: mass}}}[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow \dfrac{89}{18}[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow 4.94\: moles[/tex]

We know –

Number of molecules:-

[tex]\qquad[/tex][tex] \purple{\bf \longrightarrow No \: of \: moles \times Avogadro \: number}[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow 4.94×6.022×10²³[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow 2.98 ×10²⁴[/tex]

[tex]\qquad[/tex][tex]\purple{ \bf \longrightarrow 2.98×10²⁴ molecules}[/tex]

[tex]\qquad[/tex]____________________

Answer:

the sun is directly behind your head

Explanation:

The reason why we can see a rainbow is caused by sunlight and atmospheric conditions

Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds. When it bonds only with hydrogen, it forms compounds called hydrocarbons. Carbon can form single, double, or triple covalent bonds with other carbon atoms.

a wrong

b wrong

c right

d wrong

1 mole of water is contained in a sample of water that has a mass of 18.0 g.

HOW TO CALCULATE NUMBER OF MOLES:

The number of moles of a substance can be calculated by dividing the mass of that substance by its molar mass.

no. of moles = mass ÷ molar mass

According to this question, a sample of water has a mass of 18.0g. The number of moles is calculated as follows:

no. of moles of H2O = 18.0g ÷ 18g/mol

no. of moles of H2O = 1mol

Therefore, 1 mole of water is contained in a sample of water that has a mass of 18.0 g.

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Answer:

D

Explanation:

Answer:

Palms and other small trees

The choices which describes an organism found in the under story of a rain forest are bacteria, thick and woody vines.

The understory is a layer of young trees, short species of trees, shrubs, and soft-stemmed plants that lies several meters beneath the canopy's bottom. The understory differs greatly from one rainforest to the next.

The organism that is found in the under story of a rain forest is bacteria and very small plants, thick and woody vines.

Hence organism that is present in the understory are bacteria, thick and woody vines.

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Answer:

Coffee Filter.

Tea-bags.

Water Filters.

Sand Filtration.

HEPA Air Filters.

Automotive Filters.

Belt Filters.

Dialysis.

Explanation:

Answer:

it will be same as before

Answer:

The mass on the balance stays the same

Explanation:

.

Answer:

Chlorine

Explanation:

Chlorine has a valence shell of 7 electrons and chlorine is smaller in size, so it has a stronger pull/attraction on the electrons than Silicon.

Answer:

A polar bond is one where the charge distribution between the two atoms in the bond is unequal. A polar molecule is one where the charge distribution around the molecule is not symmetric. It results from having polar bonds and also a molecular structure where the bond polarities do not cancel.

Explanation:

Explanation:

The Mechanical Hound is a robotic animal that firemen can deploy to hunt and catch fugitives. It can be trained and programmed to hunt its prey very quickly by smell. Once it catches its prey, the Hound injects the person with a sedative; unable to run, the drugged fugitive is easily captured.

Tartaric acid is the white, powdery substance that coats tart candies such as Sour Patch Kids. COmbustion analysis of a 12.01g sample of tartaric aid, which contains carbon, hydrogen and oxygen, produces 14.08g CO2 and 4.32g

H2O.

i would know because i have see what there made of

Answer:

it because of cold weather

Answer:

Matter

Explanation:

Solids, liquids, and gases are the three types of matter that can be found in the world around us today. In solids, all of the particles are close together. They move more in liquids, but they are spread out in gas.

Answer:

B. 1s,2s,2p,3s

Explanation:

Answer:

B. Its particles maintain a constant speed

Explanation:

Just did it :D

The graph shows the change in temperature of a sample of water in a closed system as thermal energy is added over time. 150°C 100°C Temperature (°C) 50°C 0°C -50°C 10 20 30 40 Time (min) 50 60 during changes of state water particles maintain a constant speed. Therefore, option B is correct.

The term thermal energy is defined as the energy contained within a system that is responsible for its temperature.It is formed when the atoms and molecules in a substance vibrate faster due to a increase in temperature.

The examples of thermal energy sources are fossil fuels like natural gas, coal and oil, and solar heat, heat pump electric heat, and geothermal heat.

Thus, during changes of state water particles maintain a constant speed, option B is correct.

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Answer:

10.09 grams

Explanation:

First you need to know the number of moles you are dealing with.

If you know that each mole has 6.022x10²³ of something (in this case of atoms), you can divide 3x10²³ atoms of neons by 6.022x10²³ to obtain the number of moles.

You have 0.5 moles of Neon, so then by the periodic table, you see that the molar mass of neon is 20.18g/mol, so by each mole you have 20.18 grams of neon. Multiply 20.18 grams by 0.5 moles and you got 10.09 grams of Neon

Answer:

Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup." Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.

If Kelli and Jarvis maintain a forward force of 524 N for 1.44 seconds on a 158-kg piano, the acceleration will be 0.671 m/s² and the final velocity will be 0.966 m/s.

Kelli and Jarvis exert a force of 524 N on a 158- kg (m) piano.

The friction force, which opposes this force, is 418 N.

The net force (F) is the difference between both forces.

F = 524 N - 418 N = 106 N

We can calculate the acceleration (a) of the piano using Newton's second law of motion.

Newton's second law of motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force and inversely proportional to the mass of the object.

a = F/m = 106 N/158kg = 0.671 m/s²

The piano start from rest (u = 0 m/s) and moves with an acceleration of 0.671 m/s² for 1.44 s.

We can calculate its final velocity (v) using the following kinematic equation.

v = u + a × t

v = 0 m/s + 0.671 m/s² × 1.44 s = 0.966 m/s

If Kelli and Jarvis maintain a forward force of 524 N for 1.44 seconds on a 158-kg piano, the acceleration will be 0.671 m/s² and the final velocity will be 0.966 m/s.

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an atom because its the smallest thing in the entire world and in all orgnaisms

Grasses can grow where they could not earlier because the soil conditions, water volume, or rate of sunlight have evolved.

Each species of plant requires specific conditions to thrive. These conditions include:

This implies that if the conditions for a specific species are not provided in terms of sunlight, radiation, and water, the plant will not grow in that specific zone. In the same way, if the conditions of a zone change and they are not suitable for a plant species the plant will grow even if this was not possible before.

This key idea is the reason why some plants including grasses can now grow in zones where they did not exist before. Some of the factors that have contributed to this are:

Learn more about grass in: https://brainly.com/question/3671945

Answer:

they are produced by the body in response to the presence of foreign substance

Answer:

The answer of a is 5.45% and b is 3.64%

Explanation:

Density of water = 1 g/mL

∴ Mass of water (solvent) = 500 g

Mass of solute (glucose) = 30 g

Mass of solute (common salt) = 20g

Mass of solution = (30 + 20 + 500) g = 550 g

Mass percentage of solution for glucose

= Mass of solute (gucose)/Mass of solution × 100

= 30/550 x 100

= 5.45 %

Mass percentage of solution for common salt

= Mass of solute (common salt)/Mass of solution × 100

= 20/550 × 100

= 3.64 %

Thus, The answer of a is 5.45% and b is 3.64%

-TheUnknownScientist 72

Answer:

5.45%

and

3.64%

hope it's helpful