Pls answer rn due tmr pls pls fast

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.

Answer:

1. the nail which is kept immersed in Sodium Chloride solution

2.

Explanation:

Using thermodynamics

[tex]\\ \sf\longmapsto Q=mc∆T[/tex]

[tex]\\ \sf\longmapsto Q=0.015(328)(4184)[/tex]

[tex]\\ \sf\longmapsto Q=20585.28J[/tex]

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

Answer:

D

Explanation:

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

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:

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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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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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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:

it because of cold weather

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:

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

Explanation:

Answer:

20.03g

Explanation:

This is the formula for percentage yield:

Percentage yield = Actual Yield / Theoretical yield

Rearrange it to get the Actual yield, which would be:

Actual yield = Percentage yield (in decimal form) x Theoretical yield

We know that 75% of CO2 is produced as the percentage yield in a reaction and the theoretical yield for the mass we're supposed to find is 26.7 grams.

Percentage yield in decimal form: 0.75

Theoretical yield: 26.7g

Plug it in the equation

Actual yield = 0.75 x 26.7g

Actual yield = 20.03g

Answer: The number of protons

Explanation:

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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Taking into account the room temperature and pressure, there are 0.4167 moles in 10 dm³ of sulfur dioxide gas.

RTP refers to Room Temperature and Pressure. Pressure is 1 atm and Temperature is 298K. In this case, one mole of any gas has a volume of 24 dm³ or 24,000 cm³. This volume is called the molar volume of a gas.

In other words, the molar volume (the amount of space occupied by one mole) of any gas is 24dm³ (1 mol of gas molecules occupies 24.0 dm³).

Therefore, the amount of volume occupied by any gas can be calculated by multiplying the number of moles of gas by 24dm³:

Volume = Moles of gas× 24 dm³

So, the number of moles can be calculated as:

Moles of gas= Volume÷ 24 dm³

In this case, you know that volume if sulfur dioxide gas is 10 dm³. So, replacing:

Moles of gas= 10 dm³ ÷ 24 dm³

Solving:

Moles of gas= 0.4167

Finally, there are 0.4167 moles in 10 dm³ of sulfur dioxide gas.

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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:

A)

Explanation:

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:

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:

Because they do not naturally react with other elements

Explanation:

Since noble gases do have a fulfilled valence shell, they do not react with other elements because they're already stable by the themselves.

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:

Answer:

the sun is directly behind your head

Explanation:

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

Answer:

An elastic collision.

Explanation:

When a ball is dropped to the ground, one of four things may happen: It may rebound with exactly the same speed as the speed at which it hit the ground. This is an elastic collision.

Answer: 5.5 7.5 102

Explanation: using the equation above you can get these %s

Answer:

Coffee Filter.

Tea-bags.

Water Filters.

Sand Filtration.

HEPA Air Filters.

Automotive Filters.

Belt Filters.

Dialysis.

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:

3... uhm I'm not sure it could 2

Answer:

Answer is below with the steps in order

Explanation:

4) Blood picks up carbon dioxide from the body

7) Heart pumps carbon dioxide rich blood to the lungs

8) Inhale

9) Nose traps germs in air

10) Air moves down the trachea

3) Air moves through bronchi into the bronchioles

6) Alveoli receive oxygen pass to blood

9) Oxygen passes into the blood

11) Alveoli receives carbon dioxide from the blood

12) Oxygen-rcih blood flows to the heart

3) Carbon Dioxide moves from bonchioles to bronchi

13)Carbon dioxide flows up

1) Heart pumps oxygen-rich blood to the body

The last four of five steps could be switched up a little bit since it all happens synchronously, but this is the most accurate interpretation.

The statements in the correct order are:

The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.

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