What is the main purpose of the nervous system?
A:exchanges gases between the body and the environment
B: gathers information from the environment and body and coordinates actions
C: regulates the body using hormones
D: provides shape and structure for the body
Answer:
B
Explanation:
the nervous system (nerves) is the brains communication to the body
Describe what happens when two bodies of matter at different temperatures are brought together.
Answer:
maybe they will be the same temperature
Explanation:
Answer: The effect of this transfer of energy usually, but not always, is an increase in the temperature of the colder body and a decrease in the temperature of the hotter body.
Explanation:
what is C6H6+O2--> CO2+H2O balanced
Answer:
2C6H6 + 15O2 → 12CO2 + 6H2O
Answer:
2C6H6 + 15O2 --> 12CO2 + 6H2O
PLEASE HELP WILL GIVE BRAINLIEST
2 eggs cook in a frying pan, which is sitting over a gas burner.
Is thermal energy being transferred by radiation in this image? Why or why not?
Answer:
No, thermal energy is not being transferred by radiation. The eggs are in direct contact with the metal pan, which is in direct contact with the gas flame, so this is conduction, not radiation. Radiation transfers thermal energy by electromagnetic waves, not by direct contact.
Answer:
no
Explanation:
a metal pan is cooking the eggs because the flame is touching the pan and the molecules are colliding with each other
By counting the number of crests that pass by a given point in a set amount of time, what you would be calculating?
Answer:
Frequency
Explanation:
When we talk about crests, we are referring to the high points of a wave.
We measure wave frequency by counting out the the number of crests (or high points) of a given wave that pass by a given point in a set amount of time. Thus, the higher the number of crests, the greater the frequency of the wave and vice versa.
We define the frequency of a wave as the number of waves that passes by a fixed point within a given period of time.
7
When one kind of cell changes to a specialized cell, this is an example of ... (S
Answer:
Cellular differentiation
Explanation:
Answer:
cellular differentiation
Explanation:
Two oxides, X and Y, are added separately to dilute sulfuric acid and Giste sesiun toycrolide,
X reacts with dilute sulfuric acid but y does not react,
Y reacts with aqueous sodium hydroxide butx does not reach.
Which type of oxide are X and Y?
Answer:
x basic and y acidic
Explanation:
hope it helps
Advertisements for tobacco and alcohol products work because they "tell the truth."
True
False
Select the correct answer.
Which phrase describes a polymer?
A.
a branching structure containing 10 carbon atoms and 22 hydrogen atoms
B.
a crystal containing many sodium ions and many fluoride ions
C.
a long chain of carbon atoms with hydrogen atoms attached to them
D.
a molecule containing six carbon atoms arranged in a ring structure
E.
a single atom of calcium bonded to two atoms of chlorine
C. a long chain of carbon atoms with hydrogen atoms attached to them.
Explanation:
Answer:
C.
a long chain of carbon atoms with hydrogen atoms attached to it
how does friction affect how tractors move in mud
why do non-metal aroms form covalent bonds e.g. H2O
Answer:
Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom. ... Covalent compounds tend to be soft, and have relatively low melting and boiling points.
Classify the waves as longitudinal or transverse.
Answer:
the bell is longitudinal
the secound one is transverse
third is longitudinal
the fourth is transverse
Explanation:
i got it right on my mastery test
(a) Describe how a simple molecular structure differs from a giant molecular structure.
Answer:
Giant structures are usually arranged in to giant regular lattices and they are extremely strong because they have many bonds involved. Simple molecules are just normal molecules as the name suggests like CO². though it contains strong covalent bond it still has weak intermolecular forces
Explanation: when your account gets to deleted and your trying to get your points up lol
write formulas and names for two binary ionic compounds
I NEED THIS ASAPP PLEASEE
Answer:
Exothermic
Explanation:
The equation of the reaction is given as;
H₂O(vapour) --> H₂O(liquid)
The equation above represents a condensation process. Water vapour condenses to liquid.
Condensation involves loss of energy as heat. The equation can be modifies as;
H₂O(vapour) --> H₂O(liquid) + Heat
Due to the loss of heat, condensation is regarded mas an exotheric process.
The combustion of a sample of butane, C4H10 (lighter fluid), produced 2.46 grams of water.
2 C4H10 + 13O2 -------> 8CO2 + 10H2O
(a) How many moles of water formed?
(b) How many moles of butane burned?
(c) How many grams of butane burned?
(d) How much oxygen was used up in moles?
(e) How much oxygen was used up in grams?
a. 0.137
b. 0.0274
c. 1.5892 g
d. 0.1781
e. 5.6992 g
Further explanationGiven
Reaction
2 C4H10 + 13O2 -------> 8CO2 + 10H2O
2.46 g of water
Required
moles and mass
Solution
a. moles of water :
2.46 g : 18 g/mol = 0.137
b. moles of butane :
= 2/10 x mol water
= 2/10 x 0.137
= 0.0274
c. mass of butane :
= 0.0274 x 58 g/mol
= 1.5892 g
d. moles of oxygen :
= 13/2 x mol butane
= 13/2 x 0.0274
= 0.1781
e. mass of oxygen :
= 0.1781 x 32 g/mol
= 5.6992 g
0.137moles of water is formed, 0.0274 moles or 1.5892 g of butane burned and 0.1781 moles or 5.6992 g of O₂ is used.
What is combustion reaction?Those reaction in which fuel is oxidized by the oxygen molecules and produce carbon dioxide and water molecule.
Given chemical reaction is:
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
Given mass of water = 2.46 grams
Moles will be calculated as:
n = W/M, where
W = given mass
M = molar mass
(a) Moles of water formed is calculated as:
Moles of water n = 2.46g / 18 g/mol = 0.137moles
(b) From the stoichiometry of the reaction, it is clear that:
10 moles of water = produced by 2 moles of butane
0.137 moles of water = produced by 2/10×0.137=0.0274 moles of butane
(c) Weight of butane is calculated by using moles:
W = 0.0274 × 58 g/mol = 1.5892 g
(d) From the stoichiometry of the reaction, it is clear that:
2 moles of butane = react with 13 moles of O₂
0.027 moles of butane = react with 13/2×0.027=0.1781 moles of O₂
(e) Mass of oxygen is calculated as:
W = 0.1781 x 32 g/mol = 5.6992 g
Hence, (a) 0.137moles, (b) 0.0274 moles, (c) 1.5892 g, (d) 0.1781 moles and (e) 5.6992 g.
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ammonia gas cannot be collected in an erect gas jar?why?
Answer:
ammonia being lighter than air, is collected by downward displacement of air in an inverted gasjar
The gas jar is used to collect ammonia gas. This gas can be barely dissolved in water. As a result, the downward displacement of water does not gather it in the jar.
What is ammonia ?With the formula NH3, ammonia is a nitrogen and hydrogen inorganic chemical. Ammonia, the simplest pnictogen hydride and a stable binary hydride, is a colorless gas with a strong, pungent odor.
Because it is simpler to install inlets and outlets in one end of an erect gas jar than it is to install them on the side or the bottom, which are required for placement on a stable surface.
Ammonia is prepared in a laboratory by forcing air downward to collect the gas. Due to the high solubility of ammonia in water, it is impossible to collect ammonia gas over water.
Thus, The gas jar is used to collect ammonia gas.
To learn more about ammonia, follow the link;
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What are some of the positive and
negative effects of the use of plastics?
Answer:
Positive: Save fuel and reduces greenhouse gas
Negative: Harmful to human and animal health ( underwater animals), Hurts the food chain
Explanation:
I got it from a video. Hopefully it helps you.
Why can graphite be used as a lubricant
Calculate the number of moles in 2.67 g of carbon trihydride
Answer:0.178 moles
Explanation: carbon trihydride seems to be an unusual name for the methyl group CH3–
ionic wt 15
moles = 2.67/15 = 0.178
NaCl
+
Ba3(PO4)2
Na3PO4
+
BaCl2
1000 grams of sodium chloride is combined with 2000
grams of barium phosphate.
a)What is the limiting reactant?
b) How many grams of excess reactant are left?
Answer:
a) Sodium Chloride is the limiting reactant.
b)285g of Ba3(PO4)2
Explanation:
a) 1000g Nacl x (1mol of Nacl/58.5g) x (2 Mol Na3PO4/6 mol of NaCl)= 5.70
- 2000g Ba3 (PO4)2 X 1 mol of Ba3 (PO4)2/601.9 x 2 mol of Na3PO4/1 mol of Ba3 (PO4)2= 6.65
Hence; NaCl is the limiting Reactant.
b) 1000g Nacl x (1mol of Nacl/58.5g) x 1 mol of Ba3 (PO4)2/ 6 mol of NaCl x601.9g/1 mol= 1715g Ba3(PO4)2 USED.
2000g- 1715g=285g of Ba3(PO4)2 Left.
Sodium chloride is a limiting reagent.
284 grams of barium phosphate (excess reactant) are left.
Explanation:
Given:
[tex]6NaCl+Ba_3(PO_4)_2\rightarrow 2Na_3PO_4+3BaCl_2[/tex]
1000 grams of sodium chloride and 2000 grams of barium phosphate.
To find:
The limiting reactant and mass of excess reactant left.
Solution:
Mass of sodium chloride = 1000 g
Moles of sodium chloride =[tex]\frac{1000 g}{58.44 g/mol}=17.11mol[/tex]
Mass of barium phosphate = 2000 g
Moles of barium phosphate =[tex]\frac{2000 g}{601.93 g/mol}=3.323 mol[/tex]
[tex]6NaCl+Ba_3(PO_4)_2\rightarrow 2Na_3PO_4+3BaCl_2[/tex]
According to reaction, 6 moles of sodium chloride reacts with 1 mole of barium phosphate, then 17.11 moles of sodium chloride will react with:
[tex]=\frac{1}{6}\times 17.11mol=2.852 \text{ mol of }Ba_3(PO_4)_2[/tex]
2.852 moles of barium phosphate reacted with 17.11 moles of sodium chloride.
But according to the question, we have 3.323 moles of barium phosphate which is more than 2.852 moles.
This indicates that barium phosphate is an excessive reagent and sodium chloride is a limiting reagent.
Moles of barium phosphate left unreacted:
[tex]=3.323 mol - 2.852 mol = 0.471 mol[/tex]
Mass of 0.471 moles of barium phosphate:
[tex]=0.471 mol\times 601.93 g/mol=283.51\approx 284 g[/tex]
Sodium chloride is a limiting reagent.
284 grams of barium phosphate (excess reactant) are left.
Learn more about limiting reagents here:
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Solid to Gas
As a change is state takes place, heat _______ and temperature _______.
A. Increases, stay the same
B. Stay the same, changes
C. Increases, increases
Answer:
c. c. c c c c c cçcc. ccccccccc
Explanation:
ccc cc
When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. So option A is correct option.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. Hence option A is correct.
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How many moles are in 5.025 grams of NaOH?
Answer:
The SI base unit for amount of substance is the mole. 1 grams NaOH is equal to 0.025001806380511 mole.
Answer:
0.025001806380511 mole.
Explanation:
The SI base unit for amount of substance is the mole. 1 grams NaOH is equal to 0.025001806380511 mole.
13.) Write one paragraph minimum of 6 sentences addressing your concerns or lack of concern about DHMO.
Answer:
I am not sure
Explanation:
ΔABC ~ ΔEFD
Which of the following are properties of the oxides of non-
metals?
property 1
property 2
A
acidic
covalent
B.
acidic
ionic
С
basic
covalent
D
basic
ionic
(a)
(b)
(d)
Answer:
it is option A hope it helps
The properties of nonmetallic oxides include acidity and covalent character. Hence, option A is correct.
What are non-metals?Non - metals are elements in the rightmost side of the periodic table. Non -metals are mostly gases and some of them include, metalloids also. Non-metals are commonly electron -deficient and some of them are highly electronegative.
A compound shows covalent character, if the electrons are shared between the constituent atoms. Covalency increases from left to right in periodic table.
As the covalent character increases, acidity increases. Oxides of non-metals are electrophiles and acts as Lewis acids. They are all covalent compounds. Therefore, option A is correct.
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Complete the following reaction :
HC≡CH + HBr→?
hope it helps you .............
Where is the air pressure greater-- at sea level or on a mountaintop? Explain
Answer:
Air pressure is greater at sea level than at the top of a mountain. The amount of air at sea level is greater than that on top of a mountain.
Explanation:
Please give thanks to all my answers and please mark as brilliant and please follow me
Rank the following 3rd period atoms in order of increasing force of attraction on its respective electrons.
Sodium, silicon, magnesium, sulfur, argon
A. argon, sulfur, silicon, magnesium, sodium
B. sodium, magnesium, silicon, sulfur, argon
C. sulfur, silicon, argon, sodium, magnesium
D. argon, silicon, magnesium, sulfur, sodium
Answer:
B
that's all HAHA why do it have to be 20 characters to answerrr
What are the three energy's .
Answer:
Energy and how it can change forms. Kinetic, potential, and chemical energy.
how many molecules are in 4K2CO3
Answer: 5 molecules
Explanation:
2 molecules of K and 3 molecules of O