Answer:
When the bell is rung the switch closes allowing electricity to flow making the hammer hit the bell, making the sound to alert people in the house.
Explanation:
Which best explains why conservation of mass should be studied in a closed
system?
A. to prevent contamination of the products
o
B. to prevent the loss of any reactants
c. to prevent the release of any gases produced
D. to prevent the absorption of heat from the outside
Answer: C
Explanation:
The option that best explains why conservation of mass should be studied in a closed system is to prevent the release of any gases produced.
The law of conservation of mass states that mass can neither be created nor destroyed in a reaction, but can be converted from one form to another during the course of the reaction.
A closed system is one that cannot exchange matter with its surrounding while an open system is free to exchange both matter and energy with its surrounding.
When a system is opened, gaseous reactants of products may be lost to the surroundings and the mass will not be conserved as a result.
However, in a closed system, gaseous reactants or products remain within the system and the mass of the system before and after the reaction remains constant.
More on the law of conservation of mass can be found here: https://brainly.com/question/13383562
Which of the following is not a polyner glucose tryglicerides starch and dna
Answer:
Glucose
Explanation:
A polymer is a macromolecule composed of many repeating subunits.
Triglycerides are made of three fatty acids and glycerol, they are polymers of fatty acid molecule monomers.
DNA molecules are polymers of nucleotides.
Glucose is a monomer. When it polymerizes it forms starch or cellulose.
Therefore, the only option that is not a polymer is glucose.
What moon phase will she observe approximately one week later?
O A First quartel
OB Full Moon
OC Waning gibbous
OD New Moon
Answer:
Why does the Moon have phases?
At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).
At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).
The Moon has phases because it orbits Earth, which causes the portion we see illuminated to change. The Moon takes 27.3 days to orbit Earth, but the lunar phase cycle (from new Moon to new Moon) is 29.5 days. The Moon spends the extra 2.2 days "catching up" because Earth travels about 45 million miles around the Sun during the time the Moon completes one orbit around Earth.
At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).
You can create a mockup of the relationship between Sun, Earth, and Moon using a bright lamp, a basketball, and a baseball. Mark a spot on the basketball, which represents you as an observer on Earth, then play with various alignments of Earth and Moon in the light of your imaginary Sun.
When is the Harvest Moon?
The full Moon that occurs closest to the autumnal equinox is commonly referred to as the "Harvest Moon," since its bright presence in the night sky allows farmers to work longer into the fall night, reaping the rewards of their spring and summer labors. Because the equinox always falls in late September, it is generally a full Moon in September which is given this name, although in some years the full Moon of early October earns the "harvest" designation.
Why do we always see the same side of the Moon from Earth?
The Moon always shows us the same face because Earth's gravity has slowed down the Moon's rotational speed. The Moon takes as much time to rotate once on its axis as it takes to complete one orbit of Earth. (Both are about 27.3 Earth days.) In other words, the Moon rotates enough each day to compensate for the angle it sweeps out in its orbit around Earth.
Gravitational forces between Earth and the Moon drain the pair of their rotational energy. We see the effect of the Moon in the ocean tides. Likewise, Earth's gravity creates a detectable bulge -- a 60-foot land tide -- on the Moon. Eons from now, the same sides of Earth and Moon may forever face each other, as if dancing hand in hand, though the Sun may balloon into a red giant, destroying Earth and the Moon, before this happens.
When does the young Moon first become visible in the evening sky?
There is no real formula for determining the visibility of the young Moon. It depends on several factors: the angle of the ecliptic (the Moon's path across the sky) with respect to the horizon, the clarity of the sky (how much dust and pollution gunks it up), and even the keenness of the observer's eyesight.
The young Moon becomes visible to the unaided eye much earlier at times when the ecliptic is perpendicular to the horizon, and the Moon pops straight up into the sky. In these cases, it may be possible to see the Moon as little as 24 hours after it was new, although every hour beyond that greatly increases the chances of spotting it. When the ecliptic is at a low angle to the horizon, and the Moon moves almost parallel to the horizon as it rises, the Moon probably doesn't become visible until at least 36 hours past new.
The record for the earliest claimed sighting of the young crescent Moon is around 19 hours, although most experts are suspicious of any claims of times less than about 24 hours.
Explanation:
The number of protons plus the number of neutrons in an atom is equal to its
Uranium has the atomic number 92; its atoms contain 92 protons and 92 electrons. Each atom also has a mass number, denoted by the symbol A. The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains.
(hope this helps ^^)
Help you could take your time and give a explanation that you didn’t guess
Which word is most similar in meaning to data?
A.effect
B.color
C.evidence
D.number
Evidence is most similar in meaning to data. Thus option C is correct.
what are the different types of data in research ?Different types of data describe the things after assigning value to it.
For analysis of data it is mandatory to organize, process, and present the information in a useful way.
Qualitative data presented in words and descriptions forms, we can only observe this data, harder to analyze in research.
For example, taste, experience, texture, or opinion are considered as qualitative data.
Quantitative data are those which can be measured and expressed in the form of numerical figure.
For example, age, rank, cost, length, weight, scores,
Categorical data represented in the form of groups. For example, In a field survey a person responding by answering the related questions of living style, marital status, smoking habit etc.
Thus option C is correct.
Learn more about data, here:
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What is the speed of a rocket that traveled 1400 m in 11 seconds?
Answer:
The answer is 127.27 m/sExplanation:
The speed of the rocket can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
where
d is the distance
t is the time
From the question we have
[tex]v = \frac{1400}{11} \\ = 127.272727...[/tex]
We have the final answer as
127.27 m/sHope this helps you
All matter has both physical and chemical properties. A physical property can be observed without changing the identity of the substance. Which is a physical property?
A. ability to rust
B. density
C. flammability
D. reactivity with the water
Explanation:
Density
Hope it helps :)
Give an example of mechanical to mechanical energy
Answer:
A brick held at a vertical position above the ground or zero height position). A moving car possesses mechanical energy due to its motion (kinetic energy).
Explanation:
A balloon with a mass of 5 grams is blown up and popped. If all the pieces are weighed what would be their total mass?
2.5 grams
5 grams
10 grams
7.5 gram
Answer:
5 grams
Explanation:
connexus sience 6 a lesson 10 unit test
Answer:
Whats the qeustion
Explanation:
think pls
why do you divide 1 by 10???
Answer: 0.1
Explanation: because if you divide 1/10 gives you 0.1
The form of a frog immediately after hatching: _____
A.Fish
B.Pupa
C.Tadpole
D.Larva
Which of the picture demostrate a state of matter without a fixed shape or dices volumen?
•J
•K
•L
•M
Answer:
we need picture
Explanation:
please help with this question
Answer:
physical
Explanation:
What nuclear symbol can be represented by 40p, 52 n
What happens when the lava “meets” the ocean? *
Answer:
Steam
Explanation:
When lava meets the sea it cools quickly while boiling the ocean into steam. The billowing steams clouds can be deadly as they contain small glass shards of fragmented lava and acid mist from sea water.
What occurs in a chemical reaction?
A: Products are formed from reactants by the breaking and forming of new bonds.
B: Reactants are formed without chemical bonds being broken.
C: Products are formed without chemical bonds being broken.
D: Reactants are formed from products by the breaking and forming of bonds.
Answer:
A: Products are formed from reactants by the breaking and forming of new bonds.
Answer:c
Explanation:
Which of the following statements describes the difference
between a mixture and a pure substance?
A. A mixture tends to be homogeneous, while a pure
substance tends to be heterogeneous.
B. A mixture has a specific melting point, while the
melting point of a pure substance can vary.
C. The density of a mixture can change with temperature,
but the density of a pure substance cannot change.
D. The composition of a mixture can vary from sample to
sample, but the composition of a pure substance is
always the same.
Answer:
A.
Explanation:
I found the answer online when I was researching for it I hope I helped.
Which two elements non the periodic table are in the same period
At room temperature, an element that is a brittle solid and a poor conductor of
heat and electricity could have an atomic number of
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Explanation:
What is the maxlmum number of electrons that can be present in each principal energy level of hydrogen?
Answer:
Two electrons
Explanation:
Many jobs have been replaced because of new blank
Answer:
technology.
Explanation:
Which statement describes the electron sharing between hydrogen and fluorine?
A. Hydrogen shares seven electrons, while fluorine shares one electron.
B. Hydrogen shares one electron, while fluorine shares seven electrons.
C. Hydrogen and fluorine share one electron with each other.
D. Hydrogen and fluorine share seven electrons with each other.
Answer:
C
Explanation:
Hydrogen has one electron in its outermost shell, while fluorine has seven electron in its outermost shell, hence both hydrogen and fluorine needs a single electron to complete its outermost shell. That's why there is a single bond between hydrogen and fluorine.
Both hydrogen and fluorine share one electron with each other for the completion of their outermost shell. So the correct option is C.
What is covalent bonding?
In chemistry, the interatomic linkage that can be formed between atoms of the same or different elements and is due to the sharing of an electron pair between two atoms is called a covalent bond.
The kind of bonding is the result of an electrostatic force of attraction of their nuclei for the same electrons so that they can complete their octet. When the bonded atoms have lower total energy than that of widely separated atoms, a covalent bond is formed m
The inorganic substances hydrogen, nitrogen, chlorine, water, and ammonia (H2, N2, Cl2, H2O, NH3) and also all the organic compounds are the molecules that have covalent bonding. In the case of structural representations of molecules, this type of bonding is indicated by solid lines that connect pairs of atoms.
Therefore the correct option is C.
Read more about covalent bonds, here
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1. If you increase the force on an object, it’s acceleration increases.
True or false
2. If you increase the mass of an object, it’s acceleration decrease.
True or false
Vote you brainiest:)
Answer:
Answer is given below............
1) true
2) false
Durning a chemical reaction, the law of_____ ______ states that the total mass of the products must be equal to the total mass of the recent
Answer: conservation of mass
Explanation:
An EMR photon is 0.01 m long what is it's frequency and what type of wave is it?
Answer: Electromagnetic radiation can act both as a wave or as a particle or photon. Electron radiation is released as photons or bundles of light energy that travel at the speed of light as waves. Therefore electromagnetic radiation can be described by wave theory, where it is represented by its speed, frequency and wavelength.
will mark brainliest if its right
Answer:
Rutherford's!
Which set of numbers gives the correct possible values of l for n = 2?
0
0, 1
0, 1, 2
0, 1, 2,
Answer:
0,1
Explanation:
A cube of iron at 20. Degrees C is placed in contact with a cube of copper at 60 degrees C. Which statement describes the initial flow of heat between the cubes?
Answer:
D) Heat flows from the copper cube to the iron cube.
Explanation:
These are the options for the question
A) Heat does not flow between the cubes.
B) Heat flows in both directions between the cubes
C) Heat flows from the iron cube into the copper cube.
D) Heat flows from the copper cube to the iron cube.
From the knowledge of
second law of Thermodynamicss, which says heat moved from higher temperature to lower temperature region, and termal conduction,energy such as heat will only flow from higher temperature to lower temperature, which means the heat will move from higher concentration to lower Concentration. As the cube of copper at 60 degrees is heated the atoms beginnings to vibrate as it acquire energy then moves and flow to the lower temperature part.
Therefore, Heat flows from the copper cube to the iron cube.