Answer:
Reflection takes place from the polished smooth surfaces
Explanation:
A vacuum does not refer to an opaque body. An opaque body does not allow light to pass through it while a vacuum is simply empty space without air.
A smooth polished surface often acts as a mirror, it is a good reflector of light.
The moon is a non luminous body in the sky. It merely reflects the light from the sun.
A Pinhole camera can not take pictures of moving objects because it only focuses on any image placed before it.
Shadows are not inverted, the always appear upright.
If there are 6 waves in a 2-second time frame, what is the frequency
Answer:
3 Hz
Explanation:
frequency = [tex]\frac{number of waves}{time}[/tex]
thus [tex]f=\frac{6}{2}[/tex] = 3 Hz
If there are 6 waves in a 2-second time frame, the frequency is 3 Hz. When a wave travels through a medium, the frequency describes how frequently the medium's particles vibrate.
What is the frequency of a wave?The frequency identifies the frequency at which the particles of the medium vibrate as a wave passes through it.
Frequency = number of waves ÷time
The number of waves is 6 and time is 2 second
f = 6 ÷ 2
= 3
A disturbance or variation that causes energy to be transferred gradually from one point to another in a medium. It can be an elastic deformation or a change in pressure, electric potential, electric or magnetic intensity, or temperature.
Therefore, if there are 6 waves in a 2-second time frame, the frequency is 3 Hz.
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Convert 3.5x1025 molecules of Co, to
moles,
Answer:
Convert 3.5x1025 molecules of Co, to
moles,
Explanation:
How do stars, like the sun, produce energy?
• Answers MUST include:
○ how the energy is produced AND the kinds of energy produced.
Answer:
The sun, like all stars, is able to create energy because it is essentially a massive fusion reaction. Technically known as nuclear fusion, this process releases an incredible amount of energy in the form of light and heat.
Types of energy produced: Stars produce energy from nuclear reactions, primarily the fusion of hydrogen to form helium.
Explanation:
hope this helped :D
5. Organisms that make their own energy storage molecules are called producers. What process do
they go through to create these molecules?
Answer:
I think it's metabolism
Hope this helps
Which are bundles of cells in the lungs that take in oxygen?
A) Alveoli
(B) bronchi
(c) nostrils
d) tranchea
Answer:
Which are bundles of cells in the lungs that take in oxygen? Alveoli.
Explanation:
Answer option A is correct. Hope you have a great day.
dlaczego emaliowane garnki rdzewieją w miejscach uszkodzenia emalii
Answer:
Explanation: I don’t even know what you said
Answer:
so basically
Explanation:
bsuxnssu hhusnn ji
5. Which of the following materials
evaporates most quickly?
O MEK
O methanol
acetone
Answer: acetone
Explanation: Acetone has the weakest intermolecular forces, so it evaporated most quickly. Water had the strongest intermolecular forces and evaporated most slowly.
plz help its due today!!!
Answer:
Explanation: First one is Purple, purple, White.
Hairy, Hairy, Non hairy.
Answer:
Any dominant trait (capital letter) will dominate the recessive trait (lowercase letter)
Explanation:
Any letter combo with the dominant trait will have that dominant trait. The only time the recessive trait will come through is if it is a double lowercase letter. Ex. PP=purple flower Pp= Purple flower and pp= white flower
Is a animal searching for water a stimulus or response
Answer:
response I believe
Explanation:
i'm pretty sure it's a response cause it's the animal responding to needing water and being thirsty
hope this helps! :)
-Define what petroleum is, explain how it forms, and
what it is used for today.
-Define what natural gas is, explain how it forms, and
what it is used for today.
Answer:
Petroleum, also called crude oil, is a fossil fuel.
petroleum was formed from the remains of ancient marine organisms, such as plants, algae, and bacteria
Petroleum products include transportation fuels, fuel oils for heating and electricity generation, asphalt and road oil, and feedstocks for making the chemicals, plastics, and synthetic materials that are in nearly everything we use
Glaciers contain most of the freshwater on earth. True or false! Please help me out
During _____________ there are 24 hours of daylight at the North Pole.
summer
winter
spring
Answer:
summer
The North Pole stays in full sunlight all day long throughout the entire summer (unless there are clouds)
Answer:
summer
Explanation:
hope this helps :)
what is aqua regia solution ?
Answer:
Aqua regia is a corrosive, fuming yellow solution that is a 1:3 mixture of concentrated nitric and hydrochloric acids.
Aqua regia is a mixture of hydrochloric acid (HCl) and nitric acid (HNO3) at a ratio of either 3:1 or 4:1. It is a reddish-orange or yellowish-orange fuming liquid. The term is a Latin phrase, meaning "king's water". The name reflects the ability of aqua regia to dissolve the noble metals gold, platinum, and palladium.
What was the lowest extent of sea ice in the data, and when did it occur?
Answer:5 1/2. occurred the other day i think
Explanation:
When a stalactite is formed by water leaving mineral deposits from the ceiling of a cave, this is caused by_____
A:Erosion
B: deposition
Answer:
it is b
Explanation: As the carbon dioxide is released, calcite is precipitated or redeposited on cave walls, ceilings and floors. As the redeposited minerals build up after countless water drops, a stalactite is formed.
Compound Q decolorizes bromine water. Compound Q has two carbon atoms in each molecule. Which statement about compound Q is correct?
a) It contains carbon-hydrogen double bonds.
b) It has six hydrogen atoms per molecule.
c) It has two carbon-carbon double bonds.
d) It is produced by cracking alkanes.
The statement " It has two carbon-carbon double bonds" is correct. because Q is a kind of unsaturated hydrocarbon.
What is unsaturated hydrocarbon?
The type of compound which contain double bond or triple bond can be considered as unsaturated hydrocarbon. Unsaturated hydrocarbon can decolorized bromine water.
Two kinds of unsaturated hydrocarbon will obtain, alkene and alkyne.
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In the compound AbO3, the ratio of aluminum to
oxygen is
A) 3 moles of aluminum to 2 moles of oxygen
B) 2 moles of aluminum to 3 moles of oxygen
C) 2 grams of aluminum to 3 grams of oxygen
D) 3 grams of aluminum to 2 grams of oxygen
Answer:
c
Explanation:i got it right ony my test
Which is an essential characteristic of any mineral? A.Liquid B. Artificially manufactured C. Crystal structure D. Formed from organic processes
Answer:
Crystal structure
Explanation:
This is because minerals are organic or inorganic substances found naturally on the Earth and there are ordered substances at with atomic or molecular level. They are solid at normal Temperature. They have defined chemical composition and also have crystal structures.
Your mommy buys you a helium balloon at the circus. It has a volume of 4.00 liters at STP. What mass of helium, expressed in grams, does this balloon contain?
Answer:
I believe it will still be 4.00
Explanation:
0.714g of Helium is contained in the balloon
What is STP?STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.
According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -
Temperature of 0 degree celsius (273K)Pressure of 1 atmIt is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.
One mole of a gas under STP conditions occupies a volume of 22.4L.
Given,
Volume = 4L
1 mole of a gas occupies 22.4L of volume at STP.
Thus, 1L of a gas occupies = 1 / 22.4 moles
so, 4 L will occupy = 4 / 22.4 moles
= 0.178 moles
Moles = mass / atomic mass
Mass = moles × atomic mass of He
= 0.178 × 4
= 0.714g
Therefore, 0.714g of Helium is contained in the balloon.
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How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP??
PLEASE HELP
Answer:
8.8
Explanation:
You can view more details on each measurement unit: molecular weight of Aluminum or grams The molecular formula for Aluminum is Al. The SI base unit for the amount of substance is the mole. 1 mole is equal to 1 mole of Aluminum.
I WILL Give BRAINLIST Unlike protists, organisms in the group Animalia
A
have cells with no cell wall and have an organ system.
B
have cells with a cell wall and are heterotrophic.
C
are complex and photosynthetic.
D
are all mobile and autotrophic.
Answer:
B
Explanation:
B
have cells with a cell wall and are heterotrophic
What is the empirical formula for a compound that has 31.2% calcium, 18.8% carbon,
and 50% oxygen
Answer:
CaC2O4
Explanation:
Which of the following is likely to be affected by a growing human population?
Question 5 options:
Amount of land for farming
Amount of air pollution
Amount of clean water
All of the above
None of the above
Answer:
D.) All of the above
is the correct answer
By a growing human population, amount of land for farming, amount of air pollution and clean water is likely to be affected.
What is population?Population tells about the relative numbers of people present in particular area.
When there is a increase in the population of people then there is decrease in the amount of land for farming because more people want more land and this results in lack of land for individual. The affect of increased population results in the increase of air pollution, noise pollution, land pollution as well as water pollution.
Hence, option (d) is correct i.e. all of the above.
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The system international (SI) unit for energy is:
Question
The system international (SI) unit for energy is:
Answer: joule
PLZ BRAINLIEST+THANKS :)
13. "The business of America is business.” — President Calvin Coolidge.
By making this statement, President Coolidge was expressing his support for
a. higher taxes on corporations.
b. banking regulations.
c. democratic socialism.
d. laissez-faire capitalism.
Answer:
Answer isA higher taxes on corporations
I hope you like itIf .45 moles of water vapor is produced in a chemical reaction that occurs at STP how many liters of water are produxed
Answer:
10.1 L
Explanation:
At STP (meaning T = 273 K and P = 1 atm) one mol of any given gas will occupy 22.4 liters.
With the above information in mind, we can calculate how many liters will 0.45 moles of water vapor occupy:
0.45 mol * 22.4 L / mol = 10.1 LMeaning that if 0.45 moles of water are produced at STP, 10.1 liters of water would be produced.
How many mL of HCI, 0.1 M, will you need to prepare 0.700 L of HCL, 0.025 M?
Answer:
I think you mean 0.025 M and this is the answer
Explanation:
When 2.0 g copper is heated with an excess of sulfur, copper (I) sulfide is the product. What is the mass of the copper (I) sulfide produced? (mass to mass)
Answer: Mass is 2.50 g
Explanation: reaction 2 Cu + S ⇒ Cu2S
Amount of Cu = m/M = 2.00 g /63.55 g/mol= 0.03147 mol
Amount of Cu2S = 0.5 n(Cu) = 0.01574 mol
M(Cu2S)= 159.17 g/mol, m = n·M
When ethylene glycol (an antifreeze) is added to water,
the boiling point of the water
A) decreases, and the freezing point decreases
B) decreases, and the freezing point increases
C) increases, and the freezing point decreases
D) increases, and the freezing point increases
Explanation:
the answer is D they both increase
When ethylene glycol (an antifreeze) is added to water, the boiling point of the water increases, and the freezing point decreases.
What is antifreezer?Antifreezers are the substance which on mixes with any other compound will decreases the freezing point of that compound.
When we add ethylene glycol which is an antifreeze substance in the water then depression in freezing point takes place but at the same time elevation in boiling point also happen, because they had a great attraction force within themselves.
Decresing in boiling point and freezing point is wrong.Decreasing in boiling point and increasing in freezing point is also wrong.Increasing in boiling point and freezing point is also not possible.Hence increasing in boiling point and decreasing in freezing point takes place.
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what is an electromagnetic wave PLEASE ILL GIVE 15 POINTS AND BRAINLESt
[tex]An \: electromagnetic \: wave can \: travel \: through \: anything \:[/tex]
[tex] - be \: it \: air, \: a \: solid \: material \: or \: vacuum. [/tex]
[tex] It \: does \: not \: need \: a \: medium \: to \: propagate \: [/tex]
[tex]or \: travel \: from \: one \: place \: to \: another[/tex]
An electromagnetic wave can travel through anything - be it air, a solid material or vacuum. It does not need a medium to propagate or travel from one place to another
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