Answer:
An incandescent light bulb works by heating a filament in the bulb. Fluorescent light is a bright light produced by electricity flowing through a tube filled with ionized gas. Fluorescent light bulbs are more energy-efficient than incandescent bulbs.
Explanation:
Models can be used to make predictions .
truth or false ?
Answer:
true
...................
Expressed to the correct number of significant figures, the sum of two masses is 445.2 grams. Which two masses produce this answer?
a) 210.10g+ 235.00g
b) 210.100g + 235.10g
c) 210.1g + 235.1g
d) 210.10g + 235.10g
Answer:
All except a
Explanation: I like math. Pls mark brainliest.
The two numbers presented in the options, B, C, and D give a sum of 445.2 grams. So the correct options are B, C, and D.
What are significant figures?The number that is given as digits is established using significant figures. A significant depiction of numbers is carried by these digits. Frequently, significant numbers are employed in place of figures. By counting all of the values beginning with the first non-zero digit on the left, we may determine the number of significant digits. 13.56, for instance, has four significant digits.
The crucial or key digits that accurately represent the meaning of a certain number are known as the significant figures of that number. 7.864 contains four significant digits, for instance. These huge amounts give the accuracy of the numbers. Additionally, they are known as important digits.
Therefore, the correct options are B, C, and D.
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empirical formula of c8h14
Answer:
C4H7
Explanation:
Empirical formula is defined as the simplest ratios of atoms present in the compound.
The empirical formula for C8H14 is C4H7 as if you multiply each coefficient of C4H7 by 2, it will become C8H14. The chemical name of C8H14 or C4H7 is 1-Methylcycloheptene.
Hence, the correct answer is "C4H7".
how much empty space was there in the medium-sized rock sample
Answer:
I'm assuming this is from a lab that you did - in which case, I can't really help you out here.
Explanation:
I need some help with with question:
How could you prepare 100 ml of a 0.40 mol/L of MgSO4 solution from a stock solution of 2.0 mol/L MgSO4. And then how would u prepare it?
Answer:
C1V1=C2V2
C1 is 2.0mol/l
V1=?
C2=.4mol/L
V2=100ml or for this 0.1L
V1 is 20ml
Best way to prepare this is to measure out 20ml of the 2 molar solution and add 80mL to it to get to 100mL
Explanation:
If you have 3 moles of calcium carbonate, how many grams of calcium bicarbonate are formed?
Answer:
hhjcioz xlioyudiyyxyisrupautwtritu regards Roy
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Answer:
MgO
Explanation:
Mars have more gravity than earth?
True or false?
Answer:
false
Explanation:
earth is larger than mars so it has more gravity
Answer: false
Explanation:
the empirical formula is C6H6O.vapour density is 47.find the molecular formula
Answer: The molecular formula will be [tex]C_6H_6O[/tex]
Explanation:
Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.
Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.
The empirical formula is [tex]C_6H_6O[/tex]
The empirical weight of [tex]C_6H_6O[/tex] = 6(12)+6(1)+1(16) = 94 g.
The molecular weight = [tex]2\times \text{vapour density}=2\times 47=94[/tex]
Now we have to calculate the molecular formula.
[tex]n=\frac{\text{Molecular weight}}{\text{Equivalent weight}}=\frac{94}{94}=1[/tex]
The molecular formula will be=[tex]1\times C_6H_6O=C_6H_6O[/tex]
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can energy produce more carbon dioxide?
different fuels emit different amounts of carbon dioxide in relation to the energy they produce when burned to analyze
84.9 g of solid iron reacts with oxygen gas forming iron(III) oxide. How many moles of oxygen will react
Answer:
1.14 moles of oxygen will react
Explanation:
The balanced equation of reaction between iron and oxygen is
4 Fe + 3 O₂ → 2 Fe₂O₃
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:
Fe: 4 molesO₂: 3 molesFe₂O₃: 2 molesThe molar mass of iron being Fe 55.85 g/mole, then the following amount of mass reacts by stoichiometry: 4 moles* 55.85 g/mole=223.4 g
You can apply the following rule of three: if by stoichiometry 223.4 grams of Fe react with 3 moles of O₂, 84.9 grams of Fe react with how many moles of O₂?
[tex]moles of O_{2} =\frac{84.9 grams of Fe*3 moles ofO_{2} }{223.4 grams of Fe}[/tex]
moles of O₂= 1.14 moles
1.14 moles of oxygen will react
Which statement best compares the melting points of magnesium and sodium?
a
Magnesium has a higher melting point because it contributes one additional electron per atom than sodium in the electron sea.
b
Sodium has a higher melting point because it contributes one fewer electron per atom than magnesium in the electron sea.
c
Sodium has a higher melting point because it contributes two fewer electrons per atom than magnesium in the electron sea.
d
Magnesium has a higher melting point because it contributes two additional electrons per atom than sodium in the electron sea.
A because according to electron sea theory magnesium shares two valence electrons in electron sea while sodium shares one suggesting that magnesium has stronger metallic bond than sodium so breaking metallic bond in magnesium will require more energy as compared to breaking metallic bond in sodium
The melting point of magnesium is higher than the melting point of sodium because it contributes two additional electrons per atom than sodium in the electron sea. Thus option d is correct.
What is melting point?Melting point of a substance is the temperature at which it converts from solid state to liquid state where, the two phases are in equilibrium. Melting point is affected by the bond type, molecular weight, temperature and pressure.
Melting point of elements increases along a period because the atomic size is decreasing along the period and molecular weight is increasing. Thus, the nuclear attractive pull increases resulting in higher energy needed to break the attractive force.
Magnesium is 12th element and sodium is 11th element. Thus magnesium is smaller than sodium and have one more electron than sodium. Thus magnesium have high molecular weight and high nuclear attraction leads to its higher melting point.
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C6H12O6 O3 NF3 Co KNO3 H2 CO
Which one of these are molecules list all that apply
How does the nervous system work with the digestive system?
A: The muscular and nervous systems enable the involuntary breathing mechanism.
B: It doesn't
C: The enteric nervous system's network of nerves, neurons and neurotransmitters extends along the entire digestive tract - from
the esophagus, through the stomach and intestines, and down to the anus.
D: Gets nutrients (good) from food and hands it over to the blood
Anyone help I’m failing :(
Answer:
Enteric Nervous System
The enteric nervous system (ENS) is a subdivision of the autonomic nervous system (ANS) that directly controls the gastrointestinal system.
LEARNING OBJECTIVES
Describe the structure and function of the enteric nervous system (ENS)
KEY TAKEAWAYS
Key Points
The enteric nervous system (ENS), which is embedded in the lining of the gastrointestinal system, can operate independently of the brain and the spinal cord.
The ENS consists of two plexuses, the submucosal and the myenteric. The myenteric plexus increases the tone of the gut and the velocity and intensity of contractions. The submucosal plexus is involved with local conditions and controls local secretion, absorption, and muscle movements.
While described as a second brain, the enteric nervous system normally communicates with the central nervous system (CNS) through the parasympathetic (via the vagus nerve ) and sympathetic (via the prevertebral ganglia) nervous systems, but can still function when the vagus nerve is severed.
The ENS includes efferent neurons, afferent neurons, and interneurons, all of which make the ENS capable of carrying reflexes and acting as an integrating center in the absence of CNS input.
The ENS contains support cells, which are similar to the astroglia of the brain, and a diffusion barrier around the capillaries surrounding the ganglia, which is similar to the blood –brain barrier of cerebral blood vessels.
Key Terms
enteric nervous system: A subdivision of the peripheral nervous system that directly controls the gastrointestinal system.
EXAMPLES
The second brain of the enteric nervous system is the reason we get butterflies in our stomach or need to use the restroom more frequently when we are nervous and/or under stress.
The gastrointestinal (GI) system has its own nervous system, the enteric nervous system (ENS). Neurogastroenterology is the study of the enteric nervous system, a subdivision of the autonomic nervous system (ANS) that directly controls the gastrointestinal system. The ENS is capable of autonomous functions such as the coordination of reflexes.
Although it receives considerable innervation from the autonomic nervous system, it can and does operate independently of the brain and the spinal cord. The ENS consists of some 100 million neurons, one-thousandth of the number of neurons in the brain, and about one-tenth the number of neurons in the spinal cord. The enteric nervous system is embedded in the lining of the gastrointestinal system.
Ganglia of the ENS
The neurons of the ENS are collected into two types of ganglia:
The myenteric (Auerbach’s) plexus, located between the inner and outer layers of the muscularis externa
The submucosal (Meissner’s) plexus, located in the submucosa
The Myenteric Plexus
The myenteric plexus is mainly organized as a longitudinal chains of neurons. When stimulated, this plexus increases the tone of the gut as well as the velocity and intensity of its contractions. This plexus is concerned with motility throughout the whole gut. Inhibition of the myenteric system helps to relax the sphincters —the muscular rings that control the flow of digested food or food waste.
The Submucosal Plexus
The submucosal plexus is more involved with local conditions and controls local secretion and absorption, as well as local muscle movements. The mucosa and epithelial tissue associated with the submucosal plexus have sensory nerve endings that feed signals to both layers of the enteric plexus. These tissues also send information back to the sympathetic pre-vertebral ganglia, the spinal cord, and the brain stem.
This is an illustration of neural control of the gut wall by the autonomic nervous system and the enteric nervous system. A sensory neuron is shown to stimulate the nerves in the submucosal and myenteric plexuses, which are connected to nerves in the sympathetic and parasympathetic nervous systems. The sensory neuron is also shown signal the ganglia and central nervous system.
Neural control of the gut: An illustration of neural control of the gut wall by the autonomic nervous system and the enteric nervous system.
Function and Structure of the ENS
The enteric nervous system has been described as a second brain. There are several reasons for this. For instance, the enteric nervous system can operate autonomously. It normally communicates with the central nervous system (CNS) through the parasympathetic (e.g., via the vagus nerve) and sympathetic (e.g., via the prevertebral ganglia) nervous systems. However, vertebrate studies show that when the vagus nerve is severed, the enteric nervous system continues to function.
Explanation:
Is barium hydroxide Ba(OH)2 or is BaOH?
Answer:
What is the charge on the barium ion and what is the charge of the hydroxide ion.
Explanation:
To get the correct formula they have to add to zero over all.
Baking soda has a pH of 8. Its a(n) _________ substance
Acid
Neutral
Alkaline
Powdery
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Answer:
it's an acid
Explanation:
because itis soda
What are the 3 Newton laws
Answer:
The laws are: (1) Every object moves in a straight line unless acted upon by a force.
(2) The acceleration of an object is directly proportional to the net force exerted and inversely proportional to the object's mass.
(3) For every action, there is an equal and opposite reaction.
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Find the mass of a person walking west at a speed of 0.8 m/s with momentum of 52.0 kg*m/s west.
Answer:
12 preguntas y no te sabes ni una sola valla el mundo se está acabando
Answer:
65 kg
Explanation:
m = p ÷ v
m= 52 ÷ 0.8
m = 65 kg
Which organism is a producer? A:owl B:mouse C:grass D:snake please somebody help me
Answer:
I think it's C. Grass. :)
blood plasma for average adults has a volume of 3100mL. if the density of plasma is 1.020 g/mL, what mass of plasma is in the average adult?
Answer:
Noseeeeeee
Explanation:
Eeeeeeeeeee
HELP ASAP PLEASE WILL GIVE 12 points
A. Which of the following reaction mixtures will produce
hydrogen more quickly at room temperature:
(i) zinc granules + dilute nitric acid?
(ii) zinc powder + dilute nitric acid?
B. Give an explanation of your answer to a.
C. Suggest two other methods by which the speed of
this reaction can be altered.
Answer:
zinc powder + dilute nitric acid
Decrease the temperature in Exothermic reactions (Reactions that release energy, or become hot) Add a catalyst (A substance that reduces activation energy, speeding up the reaction) Increase the concentration of reactants. Increase the concentration of catalysts
Explanation:
Brainliest?
While driving down the road, a tiny hummingbird hit the windshield of
Maria's car. This is a clear case of Newton's 3rd law of motion. The
hummingbird hit the car and the car hit the hummingbird. How do the
forces on the hummingbird and the windshield compare?*
The forces are equal and opposite.
The force on the windshield is greater
The force on the hummingbird is greater
The force on the hummingbird is less than that of the windshield.
Answer:
2
Explanation:
Answer:
a
Explanation:
i just took it
Dona is attempting to make an electromagnetic to pick up old nails in her driveway. Which of these materials would be best to us for the core to make the strongest electromagnetic to pick up the most nails?
Answer:
The materials would be best to us for the core to make the strongest electromagnetic to pick up the most nails is described below in detail.
Explanation:
Use a couple of wire strip-pers to exclude some centimeters of insulation from every end of the cable. Skillfully cover the cable around the nail. The more cable you enclose around the nail, the more effective your electromagnet will be. Compose certain that you leave sufficient of the cable unwrapped so that you can connect the battery.
The water cycle describes the movement of water on Earth. Water in oceans and lakes evaporates and turns into water vapor. This water vapor condenses and forms clouds which produce precipitation. Precipitation falls all over the Earth's surface. The water eventually comes back to the oceans through run-off. Which steps in the water cycle carry water out of an ocean and into a freshwater lake?
A. Evaporation and precipitation
B. Rivers and streams
C. Underground tunnels
D. Condensation and run-off
Answer:
c. Underground tunnels
Explanation:
Yes, water below your feet is moving all the time, but, no, if you have heard there are rivers flowing below ground, that is not true. Water moves underground downward and sideways, in great quantities, due to gravity and pressure. Eventually it emerges back to the land surface, into rivers, and into the oceans to keep the water cycle going.
Note: This section of the Water Science School discusses the Earth's "natural" water cycle without human interference.
The steps in the water cycle that carries water out of the ocean into a freshwater lake are rivers and streams.
What is the water cycle?The water cycle is used to describe the movement of water in the ecosystem. It involves the various processes through which water can move in the universe.
The steps in the water cycle that carries water out of the ocean into a freshwater lake are rivers and streams.
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please help which one is it it’s due in 1 hour
Answer:
carbon monoxide
Explanation:
I'm not sure but I think
14. How many liters would 5 moles of oxygen gas take up?
a.0.22L
b.112
c.27.4L
d.55L
Answer:
a 0.22L
Explanation:
Answer:
A
Explanation:
1 moles of oxygen is 0.044L
What happens when a cold drink sits in a hot room? A) It remains coldincorrect answer B) It gets warmerincorrect answer C) It starts boilingincorrect answer D) It starts freezingincorrect answer
Answer:
its B
Explanation:
Petroleum is a mixture of many alkanes. The alkanes are separated and purified at oil refineries. What process decribes what happens in an oil refinery?
Answer:
Fractional distillation
Explanation:
The process of separating petroleum products into its fractions is called fractional distillation.
Fractional distillation is a method of separating a mixture of substances based on the differences in their boiling points.
Petroleum is a mixture of hydrocarbons separated in a large fractionation tower having many trays maintained at different temperatures.
As the vapor containing the petroleum mixture ascends the fractionation tower, the mixture is separated at each tray to yield the various fractions of petroleum.
What is the Ka of a 0.479 M
solution of acetic acid
(CH3COOH) with a pH of 4.76?
r
Answer:
6.31x10^-10
Explanation:
Answer: 6.31 x 10^-10
Explanation:
A group of 6 students was asked, "How many hours did you watch television last week?" Here are their responses.
7,9,4,13,13,16
Find the mean number of hours for these students.
If necessary, round your answer to the nearest tenth.
Answer:
10.3
Explanation: