I need help asap, thank you.

Answer:

A and B

Explanation:

please mark me as brainliest

Answer:

4

Explanation:

if the 0 is in the beginning it is not significant.

0 in between are always significant.

the 0 at the end are only significant if theres a decimal.

Answer:

100008

Explanation:

The v/v concentration of 160ml pure acetic acid in 650ml solution is 24.61 %.

There is 160ml of pure acetic acid in the 650 ml solution of acetic acid.

The volume/volume concentration of acetic acid can be calculated as:

Volume/Volume = [tex]\rm \frac{volume\;of\;acetic\;acid}{Volume\;of\;solution}\;\times\;100[/tex]

v/v = [tex]\rm \frac{160}{650}\;\times\;100[/tex]

v/v = 0.2461 [tex]\rm \times[/tex] 100

v/v = 24.61 %

The concentration of pure acetic acid in the 650 ml solution is 24.61 % (v/v).

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Answer:

Bromine

Explanation:

It's the halogen color on the periodic table of elements.

Answer:

Bromine

Explanation:

Answer:Robert Hooke, (born July 18 [July 28, New Style], 1635, Freshwater, Isle of Wight, England—died March 3, 1703, London), English physicist who discovered the law of elasticity, known as Hooke’s law, and who did research in a remarkable variety of fields.

Explanation:

In 1655 Hooke was employed by Robert Boyle to construct the Boylean air pump. Five years later, Hooke discovered his law of elasticity, which states that the stretching of a solid body (e.g., metal, wood) is proportional to the force applied to it. The law laid the basis for studies of stress and strain and for understanding of elastic materials. He applied these studies in his designs for the balance springs of watches. In 1662 he was appointed curator of experiments to the Royal Society of London and was elected a fellow the following year.

One of the first men to build a Gregorianreflecting telescope, Hooke discovered the fifth star in the Trapezium, an asterism in the constellation Orion, in 1664 and first suggested that Jupiter rotates on its axis. His detailed sketches of Mars were used in the 19th century to determine that planet’s rate of rotation.

Answer:

Specific heat of substance  = 0.897 J/g.°C

Explanation:

Given data:

Specific heat of substance = ?

Mass of substance = 25.0 g

Heat absorbed = 493.4 J

Initial temperature = 12.0 °C

Final temperature = 34°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 34°C -12.0°C

ΔT = 22°C

493.4 J  = 25 g ×c× 22°C

493.4 J  = 550 g.°C ×c

c = 493.4 J  / 550 g.°C

c = 0.897 J/g.°C

Answer:

The elements are listed by atomic number (the number of protons in the nucleus), and elements with similar chemical properties are grouped together in columns.

Answer:

Mg(s) | Mg2 + (aq) Au + (aq) | Au(s)

Explanation:

The standard cell notation of a galvanic cell made with magnesium (Mg) and gold (Au) Mg(s) | Mg² + (aq) Au + (aq) | Au(s).

Thus, The cathode is the location of reduction, while the anode is the location of oxidation. The identity of the electrodes in a real cell depends on the direction that the net cell reaction is taking place.

If, during spontaneous operation, electrons move from the left electrode to the right electrode (as shown in the cell notation above), the right electrode's potential will be higher than the left electrode's, and the cell potential will be positive.

The direction of "conventional current flow" goes from positive to negative, which is the reverse of how electrons move. This means that a galvanometer installed in the external circuit would show a positive reading if the electrons are flowing from the left electrode to the right.

Thus, The standard cell notation of a galvanic cell made with magnesium (Mg) and gold (Au) Mg(s) | Mg² (aq) Au + (aq) | Au(s).

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Answer:

The answer is B. The molecules of a solid are close to each other

Answer:

i got c. 57.6 yds

Explanation:

hope u get it right

good luck

Answer:

d = 0.743 g/cm³

Explanation:

Given data:

Mass of cylinder = 65.34 g

Height = 15.60 cm

Radius = 1.34 cm

Density of cylinder = ?

Solution:

Volume of cylinder:

V = πr²h   (π = 22/7)

V = 88 cm³

Density of cylinder:

d  = m/v

d = 65.34 g / 88 cm³

d = 0.743 g/cm³

The statement i.e. true is A. Radiation is the transfer of heat

through electromagnetic waves

The following information should be considered:

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Answer:

The answer would be

crushed tablet

Explanation:

just took the test on edg2020

Answer:

Crushed Tablet

Explanation:

Helium is slightly different because this element only has 2 electrons on it.

I'm not sure though just search it if you want an accurate one.

Answer:

# of protons is 95

# of neutrons is 147

Hope this helps!

Explanation:

Answer:

Protons: 95

Neutrons: 148

- Protons and electrons are equal

- To find the amount of neutrons, subtract the amount of protons/electrons from the atomic number

Answer:

the forth one i think

Explanation:

Answer:

planets,stars and lots more

Answer: Our solar system consists of the stars, the Sun, the planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune), dwarf planets such as Pluto, many moons, and a bunch of asteroids, comets and meteoroids!

Explanation:

Answer:

It's mutualism I am pretty sure

I hope this helps :)

The action modeled by the diagram is; flow of ions ( cations and anions ) in a cell/compound

The diagram is used to represent the flow of control ( flow of ions ) in a system, it is similar to a data flow diagram, because the start, direction and endpoint of an activity diagram is the similar to that of a data flow diagram. Activity diagrams are also used to generally describe the steps in a use case system as seen in the diagram attached in the question.

Hence the diagram ( activity ) represents the flow of ions in a compound

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Answer:

i think its B C and D.........

Answer:

true

Explanation:

the new substances formed as a result of a chemical reaction are called products

When ice at 0°C melts to liquid H2O, it absorbs 334 J per gram. The specific heat of water is 4.184 J g– 1 deg–1.

The final temperature of the water is equal to  2.94 °C.

Heat capacity can be described as the amount of heat needed to change the heat content of one mole of material by 1°C. Specific heat is the amount of heat needed to change the heat content of 1 gram of a material by  1°C.

The heat energy is absorbed by a substance, and its temperature increases. The rise in the temperature for each substance is different for different substances therefore, they have different heat capacities.

Given, the mass of the ice = 49.5 g

the mass of water, m= 0.219 Kg

The specific heat of water,Cp = 4.18 J/(g.°C)

The change in the temperature of the water, ΔT = (T - 21)°C

The heat absorbed by ice = 49.5 × 0.334 KJ = 16.53 KJ

The heat lost by water = 219 × 4.18 × (T - 21)

The heat absorbed by ice = The heat lost by water

-16.53 KJ = 219 × 4.18 × (T - 21) J

- 16530 = 915.42 (T-21)

T-21 = - 18.06

T = 2.94 °C

Therefore, the final temperature of the water is  2.94 °C.

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Answer:

i would say c, magma rising from the seafloor

Answer:

Your answer would be C

Explanation: Props to the guy above he did write it first

The volume of carbon dioxide produced from 11.8 L ethane at STP is 22.4 L.

The STP can be given as the standard temperature and pressure. The standard temperature is 25° C and 1 atm.

It is known that, 22.4 L of gas at STP is equivalent to 1 mole.

Thereby, concentration of ethane is:

22.4 L = 1 mole

11.8 L = 1/22.4 * 11.8 moles

11.8 L = 0.5 moles

From the balanced chemical equation:

2 moles ethane produce = 4 moles carbon dioxide

0.5 moles ethane produce = 4/ 2* 0.5 moles carbon dioxide

0.5 moles ethane produce = 1 moles carbon dioxide

The volume of  1 mole of gas at STP is 22.4 L. Therefore, 11.8 L ethane produces 22.4 L carbon dioxide.

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its electrical energy -------> light and heat

Hope this helps

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Answer:

C

Explanation:

Potential energy is obtained by an object's positioning so the first and last choice cannot be correct.

Of course the electrical energy is not destroyed so that one's not correct either.

The energy conversion that takes place must be electrical energy to light and heat.

Answer:

Mitosis

Explanation:

A cell that contains the same DNA as its parent cell is a product of mitosis.

Answer:

Mitosis

Explanation:

Answer:

ions

Explanation:

When an atom gains or loses an electron, it becomes an ion. Ions formed by the loss of an electron have a positive charge, and those formed by gaining an electron have a negative charge. Positive ions are called cations, and negative ions are called anions. Cations and anions are attracted to each other.

An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. not an atom.

Answer:

ions

Explanation:

it was a easy answer

Answer:

Their weight.

Explanation:

Weight is the measurement of gravity pushing you down, so with less gravity there would be less weight.

The astronauts expect their weight to be different on the Moon

Weight is simply defined as the gravitational pull of the earth on an object. It is measured in Newton.

The weight of an object varies with location because of gravity.

The weight of an object is related to it's mass according to the following equation:

Weight = mass × Acceleration due to gravity

Since the gravity of the Moon is lesser than that of the Eearth, the astronauts certainly knew that their weight will be different on the Moon.

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