Plz, Help :/ you can choose any question you want or all of it if you pleased.

Answer:

false

Explanation:

According to the laws of reflection, the speed of light is slowed down by denser media, hence the statement is false.

Reflection of light is defined as a property of light ray that when it strikes a smooth surface it bounces back .Objects can be seen due to this property of light.Reflection is produced by all types of waves namely sound waves, light waves, electromagnetic waves.

Reflection of light is governed by laws of reflection which are also called as Snell's laws. According to laws of reflection, angle of incidence and angle of reflection are equal.The incident ray , reflected ray and normal all lie on the same side of the plane.Light travels in a straight line before, after and during the process of reflection.There are 3 types of reflection which are diffuse reflection,specular reflection and glossy reflection.

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Answer:

C.

Explanation:

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.

Answer:

C, since matter cannot be created or destroyed the same number of particles must be present on both sides of the equation. Hence why all chemical reactions must be balanced.

Explanation:

Answer:

the answer is burning a match

Explanation:

when you break glass, the  properties of glass is still the same, melting ice and boiling water are both phyisical changes since they are chnages in state.

woo burning is a type of combustion reaction and when we light a match, matches include different chemicals that help to ignite it with friction so its A, burning a match

Answer:

A. burning a match on edge 2021

Answer:

3.2-2.5 = 0.7 pretty small difference

Explanation:

im his bruda

Answer:

5 g/cm^3

Explanation:

density = mass/volume

20/4 = 5

Answer:

inner core

Explanation:

Answer:

The outer core.

Explanation:

There is liquid metal, like iron, which creates electric currents going through the ground. When the Earth rotates on it's axis, it creates a magnetic field.

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The oil slick thick = 1.256 x 10⁻⁴ cm

Volume is a derivative quantity derived from the length of the principal

The unit of volume can be expressed in liters or milliliters or cubic meters

The conversion is

1 cc = 1 cm3

1 dm = 1 Liter

1 L = 1.06 quart

so for 1 quart = 0.943 L

[tex]\tt 0.943~L=0.943\times 10^{-3}m^3[/tex]

Volume of oil dumped = volume of swimming pool

[tex]\tt 0.943\times 10^{-3}~m^3=25\times 30\times h(h=thick)\\\\h=\dfrac{0.943\times 10^{-3}}{750~m^2}=1.257\times 10^{-6}~m=\boxed{\bold{1.256\times 10^{-4}~cm}}[/tex]

Answer:

heat is added making it a chemical change

Explanation:

Answer:

With pancakes, the chemical reaction is between a leavening agent – such as baking soda & baking powder – & an acidic ingredient – such as buttermilk – producing tiny bubbles of carbon dioxide gas. These bubble form throughout the pancake, and are trapped as the batter cooks and solidifies

Explanation:

since there is a chemical reaction the pancakes cant be changed back into the ingredients after done.

Explanation:

In solids, the particles are tightly packed together. In liquids, the particles have more movement, while in gases, they are spread out. Particles in chemistry can be atoms, ions or molecules. It is important to understand the particle nature of matter.

Answer:

They are found the same way but use different symbols when found.

Explanation:

Answer: if your quiz has these options to choose from - A: baking a cake B: grinding pepper C: lighting up a grill D: toasting bread, then it would be B: grinding pepper

Explanation: i took a quiz that had this question and i got it correct

Physical change of a substance include the phase change of the substance. Melting is an example of physical change where, a solid melts to form its liquid.

The change in state or phase of a substance is called physical change such as, melting, boiling, crystallization etc. Whereas, the change that involves bond making or bond breaking is called a chemical change.

Nuclear decay is an example of chemical change a heavy unstable atom breaks into two stable nuclei by emitting certain radiation. Forming or breaking of chemical bonds are chemical changes.

Melting of a substances is its change from solid to liquid state. At this temperature, the solid state and liquid state of a substance comes in equilibrium.

This process does not involve any bond making or breaking hence, it is a physical change. Therefore, D is correct.

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Your question is incomplete. But your complete question probably was:

which option is an example of a physical change??

A breaking chemical bonds

B forming chemical bonds

C nuclear decay

D melting a substance

Answer:

false false false false false

Answer:

melting

Explanation:

Stirring affects how quickly a solute dissolves in a solvent, but has no effect on how much solute will dissolve. The amount of solute that will dissolve is affected by temperature - more will dissolve at higher temperatures. This is called the solubility of the solute

Answer:

B. Hypothese

Explanation:

Answer:

B.Hypothese

Explanation:

i don't know but that's first came in my mind

The greenhouse effect is a process in which gases in the atmosphere keep heat near earth and prevent it from radiating into space.

Greenhouse effect can be described as the process by which radiations from the sun are absorbed by greenhouse gases and do not travel back into space. This prevents the surface of the earth from freezing.

The sun heats up the earth’s atmosphere during the day and the earth cools down at night by radiating heat back into the atmosphere. The heat is absorbed by the greenhouse gases and makes the surface of the earth warmer, which makes the survival of living beings on earth possible.

But because of the increased levels of greenhouse gases, the temperature of the earth has considerably increased. The major contributors to greenhouse gases are automobiles, deforestation,  factories, etc. which increases the amount of these gases in the atmosphere.

The greenhouse gases do not allow radiation or heat to escape from the earth and increasing the surface temperature of the earth and leading to global warming.

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Answer:

9.62 × 10² J

Explanation:

In this problem, we need to convert 230 calories to joules. For this, we must know the conversion from calories to joules.

1 Calorie = 4.184 Joules

To find Joules in 230 calories, multiply 4.184 by 23. So,

230 Calorie = (230 × 4.184) Joules

= 962.32 Joules

or

230 Calories = 9.62 × 10² J

So, the correct option is (A).

Answer:

an ice cube and paper cube with the same dimensions

Explanation:

an example is an ice cube and a cube with the same dimensions made of paper. these have the same volume, but different masses because the particles are packed differently and in different amounts.

Statement 1 is false because heat is the movement of molecules.

Statement 2 is true because matter is composed of elementary particles which are VERY small.

Statement 3 is false because the kinetic energy of a particle determines its heat and it is impossible for a particle to be completely motionless.

Statement 4 is false because neutrons do not have a charge and make up a large portion of all matter.  

Answer:

1. B

2. C

3. A

4. C

5. A

6. B

Explanation:

1. Mary discovered that the cell membrane of a bacteria acts like a fence because it keeps some things in and other things out: this is an analogy because there's a comparison between the cell of a bacteria and a fence.

2. Mary walked into her room where her little son was playing, found a broken window, and thought immediately that her son had broken it: this is an inference because she immediately thought her son broke it.

3. Mary noticed that her counter top was warm to the touch: this is an observation which was based on an evidence of touch.

4. Mary noticed that the side walk was wet and thought that it may have been that the sprinklers had been on recently: this is an inference because it was based on her thoughts.

5. Mary counted and recorded 20 heart beats in 10 seconds: this is an observation because she actually counted her heart beats.

6. The lecturer compared the human eye to a camera lens: this is an analogy because it was a comparison between a human eye and a camera lens.

Answer: You can use Boyle's law, which states that pressure is inversely related to volume when other variables are held constant. If the final pressure of a gas is half of the initial, the volume must double if temperature is to remain the same.

Explanation:

Answer:

Energia solar: é proveniente de uma fonte inesgotável: o Sol. Os painéis solares possuem células fotoelétricas que transformam a energia proveniente dos raios solares em energia elétrica. Tem a vantagem de não produzir danos ao meio ambiente.

Energia nuclear: energia térmica transformada em energia elétrica, é produzida nas usinas nucleares por meio de processos físico-químicos.

Energia eólica (ar em movimento): ela já foi utilizada para produzir energia mecânica nos moinhos. Atualmente é usada com o auxílio de turbinas, para produzir energia elétrica. É atraente por não causar danos ambientais e ter custo de produção baixo em relação a outras fontes alternativas de energia.

A energia elétrica também pode se transformar em outros tipos de energia ao chegar às residências ou em indústrias. Exemplos:

Energia térmica: quando vamos passar roupas, a energia elétrica é transformada em energia térmica através do ferro de passar.

Energia sonora e energia luminosa: recebemos iluminação em casa pela transformação da energia elétrica que, ao passar por uma lâmpada, torna-se incandescente, e o televisor nos permite receber a energia sonora.

Energia mecânica: usada nas indústrias automobilísticas para trabalhos pesados.

Answer:

λ= 4.99 * 10^-17

Explanation:

C= F * λ

F= frequency(Hz)

λ= wavelength(m)

C= 3.0 * 10^8

F= 6.01 * 10^24

λ= ?

3.0 * 10^8= (6.01 * 10^24) λ

***Simplify

λ= 4.99 * 10^-17

Answer:

to make sure that you change one factor at a time while keeping all other conditions the same.

Explanation:

Answer:

A test with the same control variable

Explanation:

Say you're testing mentos and coke, you have to use the same type of mentos and coke to keep it fair. the only thing you change is the independent variable which would be the number of mentos in this case.

Answer:

Shape?

Explanation:

that's the only thing that would make sense

Answer:

Shape  

is the answer