help pls i need help and i’m tired i took 15 test today-

Answer:

2300J

Explanation:

1 kilojoule is 1000joules so to get how much is 2.3 multiply it with 1000

Answer:

0.305556 m / s

Explanation:

Speed = distance / time

2 metres = 0.002 km

6.5 sec = 0.00180556 hrs

Therefore,

Speed = 0.002 / 0.00180556

           =  1.1 km / hr

           = 0.305556 m / s

≈ 0.31 m/s

v = d/t

= 2m/6.5s

= 0.3079 m/s

≈ 0.31 m/s

Answer:

Liquid A is a homogeneous mixture and Liquid B is a heterogeneous mixture

Explanation:

'Liquid' is characterized as 'a substance that is flowing and does not carry a defined shape due to the gap between its molecules.'

As per the details provided, the inference that can be deduced would be:

"Liquid A is a homogeneous mixture and Liquid B is a heterogeneous mixture."

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Answer:

d

................. ....

Answer:

Explanation:

24hours ×21 days=

you will get the answeer

Explanation:

he has no controlled variables

Answer : The volume of liquid is 420 mL.

Explanation :

Density : The mass per unit volume of a substance is known as density.

Formula used:

[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}}[/tex]

As we are given:

Density of mercury = 13.5 g/mL

Mass = 12.5 pounds

First we have to convert mass of sample from pound to gram.

Conversion used:

As, 1 pound = 453.6 g

So, 12.5 pounds = 453.6 × 12.5 g = 5670 g

Now we have to calculate the volume of liquid.

[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}}[/tex]

Now putting all the given values in this formula, we get:

[tex]13.5g/mL=\frac{5670g}{\text{Volume}}[/tex]

Volume = 420 mL

Therefore, the volume of liquid is 420 mL.

physical changes are those changes which can be reversed in their previous form like ice to water

chemical changes are those changes which cannot be reversed in their previous form

1. the change which are reversable are known as physical change

2.no new substance are formed

3.no change in chemical nature of the substance

4. example: • melting of ice

• tearing of paper etc.

1.this are irreversible this can't be reverse

2.new substance are formed

3.it results form a chemical reaction

4. example: • burning of wood

• rusting of iron etc.

hope it helps you :)

Answer:

Number 6

Explanation:

A reflex action is an involuntary action and nearly instantaneous movement in response to a stimulus.

Answer:

2. Nerves helps to send impulses or information from one place to another and it also carries sensory and motor fibres and most however are mixed nerves carrying both sensory and motor fibres.

3.The brain has many functions and the brain has different regions that deals with different functions in the body.

6.Reflex actions are automatic responses to stimuli.They do not involve the conscious (voluntary) or higher centres of the brain and so are also known as involuntary actions.

10.Loop of Henle,Bowman's Capsule, Glomerulus, Proximal Capsule.

13.Urter is part of the reproductive organ in an human being.

14.We should drink enough water and we should not store our urine,we should always empty our bowels when we feel like using the toilet.

15.Water is good for urinary system because it help for easy digestion and for easy work in the system.

12.The urine is stored in the bladder.

11.Kidneys remove nitrogenous wastes and also control the amount of water,salts and acids - the osmoregulatory function.

5.Nerves that carries the sensory fibre and nerves that carries the motor fibre.

1. Brain and the spinal cord or the central nervous system and the peripheral nervous system.

4.They carry informations from one part of the body to another and they also help in the coordination of the body.....

I think some of the answers are correct...Thank you for the questions.....

Answer: The concentration of the sulfuric acid is 0.09 M

Explanation:

Molarity is defined as the number of moles of solute dissolved per liter of the solution.

According to neutralization law,

[tex]n_1M_1V_1=n_2M_2V_2[/tex]

where,

[tex]n_1[/tex] = basicity of sulphuric acid [tex](H_2SO_4)[/tex] = 2

[tex]M_1[/tex] = Molarity of sulphuric acid [tex](H_2SO_4)[/tex]solution = ?

[tex]V_1[/tex] = volume of sulphuric acid [tex](H_2SO_4)[/tex]solution = 25.0 ml

[tex]n_2[/tex] = acidity of sodium hydroxide [tex](NaOH)[/tex] = 1

[tex]M_2[/tex] = Molarity of sodium hydroxide [tex](NaOH)[/tex]  = 0.150 M

[tex]V_2[/tex] = volume of sodium hydroxide [tex](NaOH)[/tex] = 30.0 ml

[tex]2\times M_1\times 25.0=1\times 0.150\times 30.0[/tex]

[tex]M_1=0.09M[/tex]

Thus  the concentration of the sulfuric acid is 0.09 M

Answer:

7.5g/mL

Explanation:

Density = Mass/Volume

             = 150.0g/20.0mL

             = 7.5g/mL

Answer:

5m/s

Explanation:

3600m ÷ 720s

= 5m/s

Steam is a gas. ... The difference between a liquid and the other states of matter is that liquid molicules are more spread apart than solid molicules but less spread apart than gas molicues. Water is the base for both ice and steam.on:

The main difference between  ice, liquid water, and steam is that ice is a solid, liquid water is a liquid, and steam is a gas.

The first difference between ice, liquid water, and steam is that ice is solid, liquid water is liquid, and steam is gas.

The second difference between ice, liquid water, and steam is that ice is solid so the molecule of solid are closely packed and intermolecular space is negligible, liquid water is a liquid so the molecule are little far with each other and intermolecular space between molecules are more as compare to solid, and steam is gas so the molecule s are scattered freely and intermolecular space is very high as compare to solid and liquid.

The third difference between ice, liquid water, and steam is that 32°F is the freezing point of water, when temperature arises from 32°F water starts melting and converted from solid to liquid.

Therefore, the main difference between  ice, liquid water, and steam is that ice is a solid, liquid water is a liquid, and steam is a gas.

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Answer:

Density = Mass / Volume

V = 1.00 * 4.00 * 2.50 = 10 cm³

22.57 g/cm³ = Mass / 10 cm³

M = 22.57 g/cm³ * 10 cm³

M = 225.7 g

Answer: The mass of the block of osmium is 225.7 g.

Explanation:

Thanks to:

HomertheGenius

The density of the osmium is 22.57 g/cm^3 the volume would be occupied by 1.50 kg of osmium will be 33.85 ml.

The density of a substance is the division of mass of the given substance and the volume of the given substance and its unit will be centimeter cube and it cannot be effect by the temperature.

The density can be calculated by the formula

                       Density = mass of substance / volume of substance in liter

                        Density = 22.57 g/cm³

                        mass = 1.50 kg

Substituting the value in the equation,

          22.57 g/cm³ =  1.50 kg / volume

          Volume = 22.75 g/cm³ × 1.50 kg

           volume = 33.85 ml

Therefore, density of the osmium is 22.57 g/cm^3 the volume would be occupied by 1.50 kg of osmium will be 33.85 ml.

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Answer:

I think the answer could be 13 i hope this helps

Answer:

Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change

Answer:

We could improve modern day smart phones by adding more storage, increasing it's speed, having more feature and changing the design of the phones to make them look more better.

Hope this helps!

Answer: They can look on the cell phone ringtone?-

Explanation:

Answer:

In the blue area, people live closely because of its 1.Indutrialised area 2. The land is costly. 3.urbanisation In lighter color areas its farther because 1.Village 2.Farming area 3.Less popular rural area

Explanation:

In the blue area, people live closely because of its 1.Indutrialised area 2. The land is costly. 3.urbanisation In lighter color areas its farther because 1.Village 2.Farming area 3.Less popular rural area    ΔΔΔΔΔβαααααααααααααααααααωωωωωωωωωωωω㏒㏒㏒

After one half life, the sample gets reduced to its half of the initial amount. The 400 g will reduces to 200 g after one half life. Thus, after three half life, it will reduces to 50 g.

Half life of  a radioactive sample is the time taken to decay its half amount. The radioactive isotopes undergo decay by the emission of charged particles. The radioactive decay is a first order reaction.

Uranium is a radioactive element which undergo alpha decay to form stable nuclei with the release of tremendous energy. Given that the half life of U-238 is 4.47 years.

Afterone half life 400 g of U-238 reduces to its half that is 200 g.  For the second half life, 200 reduces to 100 g and for the next half life that is after three half lives it reduces to 50g.

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Answer:

Element

Explanation:

An element is substance that is composed of only one kind of atom and can not be separated into simpler substances or converted into another substance by chemical processes.

Chemical elements are found in the periodic table. Examples of chemical elements include; sodium potassium, phosphorus, hydrogen etc.

Answer:

Explanation:

because in air the particles are moving very fast and jar of coffee has hot particles which kinetic energy is also more so that's why it's particles move faster and gets mixed with air and smell is coming from far away

Answer: D

Explanation: You move the decimal back 4 times.

Answer:

The answer is

Explanation:

The denisty of a substance can be found by using the formula

Making volume the subject we have

From the question

mass = 4.62 g

Density = 13.5 g/cm³

Substitute the values into the above formula and solve for the volume

That's

= 0.34222……

We have the final answer as

Hope this helps you

Answer:

22,680

Explanation:

you multiply the time value by 10080

Answer:

.91 ng

Explanation:

So for the first one the conversion factor which is the first blank in your first question is (1/100) and the second blank which would be (74)(1/100) is 0.0174

The second one would have two conversion factors where the first blank would convert to grams, so the conversion factor for the first blank is (1000/1), then converting from grams to nano grams, whose conversion factor is (1,000,000,000/1).

So in general the second one is 9.1 x 10^-13 (1000/1) x (1,000,000,000/1) = .91 ng

Hope my explanation is easy to understand.- Ryan Brown indy

9.1 x 10-¹³ kg is equal to 0.91 nanograms (ng).

CONVERT MASS IN kg TO g

1000 grams = 1 kilogram

= 9.1 x 10^(-13+3)

= 9.1 × 10-¹⁰ grams.

CONVERT MASS IN g TO ng

1gram = 1000000000 (10⁹) nanograms

= 9.1 × 10^(-10 + 9)

= 9.1 × 10-¹

= 0.91 nanograms (ng).

Therefore, 9.1 x 10-¹³ kg is equal to 0.91 nanograms (ng).

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Answer:

Density, [tex]d=19.3\ g/cm^3[/tex]

Explanation:

Given that,

Mass of gold is 38.6 g

Volume, V = 2 cm³

We need to find the density of gold cube. The density of an object is defined as how much mass it has divided by its volume. So,

[tex]d=\dfrac{38.6\ g}{2\ cm^3}\\\\d=19.3\ g/cm^3[/tex]

So, the density of the cube of gold is [tex]19.3\ g/cm^3[/tex].

Answer:

Diatomic, or two atoms per molecule, hydrogen can be isolated by electrically separating distilled water. This process is known as electrolysis and creates oxygen gas as well. It is by far the easiest and safest way to collect and store hydrogen gas

Explanation:

im not sure this the correct answer but here u go

Answer:

How can gas become a liquard

Explanation:

air filter

Explanation:

Sugar will readily dissolve in water but doesn't form cations and anions in solution. That is, there are no charge carriers formed. Substances that only partially ionize into ions when dissolved in water are called weak electrolytes.

I hope it help:)

Answer:

Dissolving sugar is a physical change. It is not a chemical change. So, ions will not be formed.