Answer:
hi
Explanation:
Thus, helium is the smallest element, and francium is the largest.
True or False. The speed of light is sped up by dense media.
Answer:
false
Explanation:
According to the laws of reflection, the speed of light is slowed down by denser media, hence the statement is false.
What is reflection?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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Which option is an example of a physical change?
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.
What is a physical change?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
Theories are built upon testing many ________?
A).laws.
B).Hypothese.
C).Facts.
Answer:
B. Hypothese
Explanation:
Answer:
B.Hypothese
Explanation:
i don't know but that's first came in my mind
Mary discovered that the cell membrane of a bacteria acts like a fence because it keeps some things in and other things out.
A. Observation
B. Analogy
C. Inference
Mary walked into her room where her little son was playing, found a broken window, and thought immediately that her son had broken it.
A. Observation
B. Analogy
C. Inference
Mary noticed that her counter top was warm to the touch.
A. Observation
B. Analogy
C. Inference
Mary noticed that the side walk was wet and thought that it may have been that the sprinklers had been on recently.
A. Observation
B. Analogy
C. Inference
Mary counted and recorded 20 heart beats in 10 seconds.
A. Observation
B. Analogy
C. Inference
The lecturer compared the human eye to a camera lens.
A. Observation
B. Analogy
C. Inference
Answer:
1. B
2. C
3. A
4. C
5. A
6. B
Explanation:
An analogy can be defined as a cognitive process which typically involves comparing things having similar characteristics or features for the purpose of explanation or clarification. An observation can be defined as a process which typically involves carefully monitoring something for the purpose of understanding and clarity. An inference can be defined as a cognitive process which involves reaching a conclusion or forming an opinion based on sets of evidence or reasoning.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.
Which process is a chemical change?
burning a match
boiling water
melting ice
breaking glass
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
1. When electrical energy is used what type of energy is also produced and considered to be waste energy? Thermal energy Mechanical energy Nuclear energy Radiant energy
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.
Get Brainiest if correct
The Moon doesn’t actually change ________, but it appears to from Earth because the part lit by the Sun changes as it travels around Earth.
Answer:
Shape?
Explanation:
that's the only thing that would make sense
Answer:
Shape
is the answer
Chlorine is a highly electronegative atom and yet CCl4 is not polar. Why might this be?
WILL GIVE BRAINLIEST AND 5 STAR+THANKYOU!
Answer:
3.2-2.5 = 0.7 pretty small difference
Explanation:
im his bruda
We use the Scientific method to minimize human error in experiments.
OS
OO
True
False
Answer:
false false false false false
What is the difference between mass number and atomic number?
Answer:
They are found the same way but use different symbols when found.
Explanation:
Cube has a mass of 15g and the volume is 30cm what’s its density
which pair of elements would form an ionic bond?
A. Carbon (C) and oxygen (o)
B. Strontium (Sr) and chlorine (Cl)
C. Cesium (Cs) and geranium (Ge)
D. Magnesium (Mg) and aluminum (Al)
Green light has a frequency of 6.01 x 1024 Hz. What is the wavelength?
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
How many joules are contained in a snack cake that is labeled "230 Calories"?
(Hint: 1 Calorie - 1,000 calories, 1 cal - 4.184 J)
O A 9.62 X 102 J
B
9.62 X 1053
C. 54.9 J
5.49 X 10 to the power of 4
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).
Which of the following correctly describes solid, liquid, and gas states of matter?
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.
i need some help only answer if you are 100% sure
Answer:
poles
Explanation:
why can't you turn pancakes back into the ingredients
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.
By mistake, a quart of oil was dumped into a swimming pool that measures 25.0 m by 30.0 m. The density of the oil was 0.750 g/cm3. Assuming the oil spread into a uniform, thin layer over the water, how thick was the oil slick?
The oil slick thick = 1.256 x 10⁻⁴ cm
Further explanationVolume 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]
A substance that conducts electricity, is malleable, ductile, and has luster would be classified as a
A) compound.
B) element.
C) metal.
D) nonmetal.
what does it mean to have a fair test?
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.
Why do space objects fall to earth
Answer:
gravity
Explanation:
hope this belps
The space objects fall to earth because of the gravitational force of the earth. Earth pulls all objects towards itself by gravity.
What is gravity?Every object and person in their respective locations can be attributed to the force of gravity. It lends an object weight. Everyone will be floating in the air if there is no gravity.
Differing locations experience different levels of gravity. Similar to the earth, there is a strong gravitational pull. There is the less gravitational pull on the moon. In mars, there is less gravitation force than on earth.
The gravitational force pulls all objects towards itself, that is why if an object from space falls, it falls towards the earth. The gravitational force is very high on Earth.
Thus, due to gravity on earth, all space objects fall to earth.
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Help please! Which of earth's layers is responsible for creating the earth's magnetic field?
A. inner core
B. outer core
C. mantle
D. crust
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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Natural process in which certain gases in the atmosphere keep heat near earth and prevent it from radiating into to space
The greenhouse effect is a process in which gases in the atmosphere keep heat near earth and prevent it from radiating into space.
What is the greenhouse effect?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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What is the effect of constant stirring on the solubility of solids and liquids?
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
What are two things with the same volume but different masses?
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.
What is the density of a metal with a mass of 20 g and a volume of 4 cm^3
Answer:
5 g/cm^3
Explanation:
density = mass/volume
20/4 = 5
what causes the greenhouse affect?
it’s actually environmental science
Based on the kinetic molecular theory (KMT), which statement is true?
The particles of matter are do not move.
Matter is composed of very small particles.
The particles of matter have zero kinetic energy.
Matter is made up of only charged particles.
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.
Which of the following is an example of the Law of Conservation of Mass?
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:
COMPREHENSION QUESTIONS
QUESTION 11: The more
move it. *
something has, the more
it takes to 1 point
force, mass
kinetic energy, force
mass, force
O mass, potential energy