Answer:
positive charge
Explanation:
protons are the positive chargers of any chemical reaction unlike neutron which are just the neutral part
Answer:
Positive charge
Explanation:
Electrons are Negative charge
Question 26 (3 points)
In the lab, a cube of wood has a mass of 41.2 grams and its temperature rises from
28.1°C to 65.1°C when placed outside in the sun for a period of time. Calculate the
amount of heat absorbed by the wood. The specific heat of wood is 1.76 J/g°C.
6
Round your answer to 1 decimal place.
Your Answer:
1
Answer
units
D Add attachments to support your work
Question 27 (3 points)
Answer:
2682.9J is the heat absorbed by the wood
Explanation:
To find the heat absorbed for a material we must use the equation:
Q = S*m*ΔT
Where Q is heat absorbed in Joules
S is specific heat of the material = 1.76J/g°C for wood
m is the mass of the material = 41.2g
ΔT is change in temperature = 65.1°C - 28.1°C = 37.0°C
Replacing:
Q = 1.76J/g°C*41.2g*37.0°C
Q = 2682.9J is the heat absorbed by the wood
Choose ALL
BIOTIC factors
Lesson 5.01
Question 1 options:
protists
animals
fungi
plants
salinity
Answer:
protists
animals
fungi
plants
Explanation:
i took the test let me know if im wrong tho
The biotic factors from the following options are protist, animals, fungi, and plants. Options A, B, c, and D are correct.
What are biotic factors?Biotic factors are those factors which can grow, and reproduce themselves.
Plants, animals, protists, and fungi are biotic factors that live, eat ad reproduce.
Salinity is the quality of any solution. It is not a biotic factor.
Thus, the correct options are A, B, c, and D.
Learn more about biotic factors
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Type the correct answer in the box. Express your answer to three significant figures. Iron(II) chloride and sodium carbonate react to make iron(II) carbonate and sodium chloride: FeCl2(aq) + Na2CO3(s) → FeCO3(s) + 2NaCl(aq). Given 1.24 liters of a 2.00 M solution of iron(II) chloride and unlimited sodium carbonate, how many grams of iron(II) carbonate can the reaction produce? The reaction can produce grams of iron(II) carbonate.
Answer:
The reaction can produce 287 grams of iron(II) carbonate
Explanation:
To solve this question we must find the moles of iron(II) chloride that react. Using the chemical equation we can find the moles of iron(II) carbonate and its mass -Molar mass FeCO3: 115.854g/mol-
Moles FeCl2:
1.24L * (2.00mol / L) = 2.48 moles FeCl2
As 1 mol FeCl2 produce 1 mol FeCO3, the moles of FeCO3 = 2.48 moles
Mass FeCO3:
2.48mol * (115.854g / mol) =
The reaction can produce 287 grams of iron(II) carbonateAnswer:
287
Explanation:
Suppose you will determine the composition of the unknown substance that was collected at the scene of the crime. You are encouraged to work on this case. You can perform a series of tests on the unknown substance and compare results of the same tests performed on known samples. Follow these steps:
List physical properties you can use as a simple method of identifying substances.
Describe how you can use density to help identify unknown substances.
Explain how forensic chemist can help you identify unknown substances.
How important is comparing tests results of know substances in a lab setting?
Answer:
b erergart
Explanation:
The image below shows the jet stream (darker line) moving across the northern United
States and Canada
Which of the following statements correctly describes how the jet stream effects local
weather?
Answer:
Explanation:
add the statements n will answer w/ 'em thanx
A: Air Pressure south of the jet stream is greater than north of the system
B the jet stream moves storms in to areas with its slow level winds.
C Clear nice weather follow along the the near stream as it winds move eastward
D As the jet stream moves southward, it will bring with it cooler temperatures
ans is d
There are 50grams of Cl2 how many molecules are produced for Cl2?
Explanation:
cl2 = 50/71
mole of cl2 = 0.704
no.of molecules = mole × avagadro no.
no of molecules = 0.704× 6.022×10²³
no. of molecules = 4.23×10²³
A student finds that the water's temperature went from 18oC to 38oC. Calculate how many calories are in the peanut.
Answer:
567 calories.
Explanation:
There 567 calories in 100 grams of peanut. In 100 grams of peanut, 49 gram is the fat, 26 grams of protein, 16 grams of carbohydrates, Sodium is 18 mg, Potassium is 705 mg. Calcium is present in peanut about 9%, Iron is 25% , Vitamin B-6 is 15% and Magnesium is 42% of their total weight. Oil content is high in the Peanut so this is the reason for high calories in peanut. It is a good source of proteins and potassium.
Which pH is the most acidic
Answers choices below
A. 7
B. 14
C. 0.5
D . 1
C. 0.5
This is the answer.
(assuming that the D option is 1, if it is 0.1 then the answer is 0.1)
[tex]0.5[/tex]
Explanation:
As you know that decreasing in the concentration of OH- (i.e., 14, 13, 12, 11,..) makes to increase in the concentration of H+ ions (5,4,3,2,1).
را
Which statement describes an intensive property of matter?
O It is the same for every sample of a single substance.
O It depends on how a substance was formed.
O It is the same for every sample of every substance.
O It depends on the amount of substance present.
Answer:
A.It is the same for every sample of a single substance.
Explanation:
Who goes to K12 and if so what grade
Answer:
I do. I am in tenth. What area are you in?
Explanation:
Answer:
8th finna be in 9th wbu
Explanation:
What is the volume of 0.150 M sodium hydroxide, required to react completely with 250.0 mL of 0.545 M acetic acid, CH3COOH solution?
Answer:
68.81ml
Explanation:
Using the formula:
CaVa = CbVb
Where;
Ca = concentration of acid (M)
Cb = concentration of base (M)
Va = volume of acid (ml)
Vb = volume of base (ml)
Based on the information given in this question;
Ca = 0.545M
Cb = 0.150M
Va = 250ml
Vb = ?
Using CaVa = CbVb
0.545/250 = 0.150/Vb
Cross multiply
250 × 0.150 = 0.545Vb
37.5 = 0.545Vb
Vb = 37.5/0.545
Vb = 68.81ml
Your simulation involved 100 atoms and eight half-life cycles. For half-life cycles 9 and later, how many radioactive nuclei would you expect to be present?
Answer:
you would expect 0 radioactive nuclei to be present
Explanation:
got it right on the assignment
22. Oxidation occurs when materials containing _______________________ are exposed to oxygen and water
Answer:
iron
Explanation:
iron reacts with oxygen easily causing rust to form. the haemoglobin in your red blood cells contains haem which is iron and that's how your body transfers oxygen all over
URGENT: Identify the subatomic particles that determine the atomic number of an element.
Answer:
the number of protons determines the atomic number
Explanation:
Ex. Aluminum has 13 protons, so it's atomic number is 13
hope this helps :)
During a reaction, H for reactants is -750 kJ/mol and H for products is 920 kJ/mol. Which statement is correct about the reaction and correctly compares the energy in bonds?
Answer:
a
Explanation:
the ones are stronger and herder to break so it will take more energy to break them then when they are made
The statement, that describes the reaction and correctly compares the energy in bonds from the given ΔH values is "It's endothermic because the energy required to break bonds in the reactants is less than the energy released when the products are formed."
What is ΔH?The quantity of energy evolved during a chemical reaction is represented by ΔH, also known as enthalpy change.
An exothermic reaction is a chemical reaction in which heat energy is emitted. The value of ΔH is always negative in exothermic processes. An endothermic reaction is a chemical reaction that absorbs heat energy. The value ΔH of is always positive for endothermic reactions.
When the bonds in the reactants are broken, more energy is absorbed than is released when new bonds are created in the products, therefore the value of ΔH is always positive in endothermic reactions.
Hence the correct option is endothermic because the energy required to break bonds in the reactants is less than the energy released when the products are formed.
Learn more about ΔH here
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35
Select the correct answer.
Which is true according to the law of conservation of energy?
A.
In a closed system, the total amount of energy in the universe keeps on changing.
B.
The supply of energy is limited, so it is essential to conserve it.
C.
In a closed system, energy can be created and destroyed.
D.
In a closed system, energy cannot be used faster than it is created.
E.
In a closed system, the total energy always remains constant.
Answer:
its a
Explanation:
HELP ASAPPPP""""A 0.0200 M NaCl solution was formed when 38.0 grams of NaCl was dissolved in enough water. What was the total volume of the solution formed? (5 points)
32.5 liters
30.3 liters
26.7 liters
22.1 liters
Answer: The volume of the solution formed will be 32.5 L. Explanation: Molarity is defined as the amount of solute present in 1 L of solution. The equation used to determine molarity of the solution follows: We are given: Molarity of the solution = 0.02 mol/L Mass of NaCl = 38 grams Molar mass of NaCl = 58.5 g/mol Putting values in above equation, we get: Hence, the volume of the solution formed will be 32.5 L.
Answer:
32.5
Explanation:
which of the following examples where molecules are slightly far apart
A.rock
B.water
C.smoke
D.plasma ball
Answer:
in my opinion I think is D you don't have to choose it
1) Calculate the temperature change for mercury if 160 g of the metal absorbs 1500 J of heat energy. Mercury's specific heat is 0.14 J/g°C.
2) How much heat is given out when 85 g of lead cools from 200.0°C? The specific heat of lead is 0.11 J/g°C
3) What is the final temperature of a substance if 1404 J of energy is added to 38 g of it at 26°C? The specific heat is 0.24 J/g°C
Answer:
1. 66.96°C
2. -1776.5J
3. 179.9°C
Explanation:
Using the formula;
Q = m × c × ∆T
Where;
Q = amount of heat (J)
m = mass (g)
c = specific heat capacity (J/g°C)
∆T = change in temperature (°C)
QUESTION 1:
∆T = ?
m = 160g
c = 0.14 J/g°C
Q = 1500 J
1500 = 160 × 0.14 × ∆T
1500 = 22.4∆T
∆T = 1500/22.4
∆T = 66.96°C
QUESTION 2:
Q = ?
m = 85g
c = 0.11 J/g°C
∆T = 10°C - 200°C = -190°C
Q = 85 × 0.11 × -190
Q = -1776.5J
QUESTION 3:
Q = 1404 J
m = 38g
c = 0.24 J/g°C
Final temperature = ?
Initial temperature = 26°C
1404 = 38 × 0.24 × (T2 - 26)
1404 = 9.12 (T2 - 26)
1404 = 9.12T2 - 237.12
9.12T2 = 1404 + 237.12
9.12T2 = 1641.12
T2 = 1641.12 ÷ 9.12
T2 = 179.9°C
What are the basic forces that drive the water cycle? Explain what they are.
Answer:
kcgiobb jkffiob hffyio hiiddhoo hhioiv
Answer: Have a blessed day
Explanation:
Water Cycle: Component # 1. Evaporation:
Evaporation is the process where a liquid changes from its liquid state to a gaseous state. Liquid water becomes water vapour. Temperature is the primary factor for evaporation.
During the water cycle the water of the oceans and freshwater bodies, such as lakes and rivers, is warmed by the sun and evaporates. During the process of evaporation, impurities in the water are left behind. As a result, the water that goes into the atmosphere is cleaner than it was on Earth.
Water Cycle: Component # 2. Condensation:
Condensation is the opposite of evaporation. Condensation is the process where a gas is changed into a liquid. Condensation occurs when the temperature of the vapour decreases.
The water droplets formed from condensation are very small and they remain suspended in the atmosphere. There millions of droplets of suspended water form clouds in the sky or fog at ground level. Water condenses into droplets only when there are small dusts particles present around.
Water Cycle: Component # 3. Precipitation:
When the temperature and atmospheric pressure are right, the small droplets of water in clouds form larger droplets or raindrops and it is called precipitation. The raindrops fall to earth.
As a result of evaporation, condensation and precipitation, water travels from the surface of the Earth goes into the atmosphere, and returns to Earth again.
Water Cycle: Component # 4. Surface Runoff:
Much of the water that returns to Earth as precipitation runs off the surface of the land and flows down-hill into streams, rivers, ponds and lakes. Small streams flow into the ocean. Surface runoff is an important part of the water cycle because, through surface runoff, much of the water returns again to the oceans, where a great deal of evaporation occurs.
Water Cycle: Component # 5. Infiltration:
ADVERTISEMENTS:
Infiltration is an important process where rain water soaks into the ground, through the soil and underlying rock layers. Some of this water ultimately returns to the surface at springs or in low spots downhill. Some of the water remains underground and is called groundwater.
As the water infiltrates through the soil and rock layers, many of the impurities in the water are filtered out. This filtering process helps in cleaning of the water.
Water Cycle: Component # 6. Transpiration or Evapotranspiration:
This is performed by plants. As plants absorb water from the soil, the water moves from the roots through the stems to the leaves. Once the water reaches the leaves, some of it evaporates from the leaves, adding to the amount of water vapour in the air. This process of evaporation through plant leaves is called transpiration. In large forests, an enormous amount of water will transpire through leaves.
Most types of commercial flour are sifted
before they are packaged and sold in the
store. What effect do you think this has
on the quality of the flour?
Answer:
It improves the texture of the flour
Explanation:
Flour is supposed to have a very fine texture. Commercial flour is not expected to occur in lumps. Lumps reduce the utility of the flour.
Hence, to improve the texture of the commercial flour, it is thoroughly sifted to ensure that there are no large lumps in the flour.This is so important when producing cake flour where the achievement of fine texture is of utmost priority.
PLZZ HELP WILL MARK AS BRAINLIESTTT!!!!!
Answer:
The object is moving with uniform acceleration
Explanation:
Acceleration is defined as the change of speed with time. Hence, we define acceleration as ds/dt.
The slope of a speed/time graph gives us the acceleration of the moving object.
An object is said to move with uniform acceleration when the speed increases by equal amounts in equal time intervals as in the straight line speed/time graph shown in the question
5) answer is A
2NaHCO3(s) + 129k) - Na2CO3(s) + H2(g) + CO2(g)
This equation indicates that AH is
and energy must be
to complete the reaction.
A)
positive; added
B)
negative; added
C)
positive; released
D)
negative; released
Answer:
A) positive; added
Explanation:
Based on the reaction:
2NaHCO3(s) + 129kJ → Na2CO3(s) + H2(g) + CO2(g)
2 moles of NaHCO3 requires 129kJ to produce 1 mole of Na2CO3, 1 mole of H2 and 1 mole of CO2.
That means, the energy must be added being, thus, an exothermic reaction. The exothermic reactions have ΔH >0.
Thus, right answer is:
A) positive; added
You throw a barbeque for your friends. Before you start the grill, your propane tank has a pressure of 78 psi. When you’re finished grilling, the temperature is 95°F and the propane tank reads 74 psi. Come nighttime the outside temperature drastically decreases to 20°C. What is the pressure of the propane tank at night?
Select one:
a. 16 kPa
b. 485 kPa
c. 107 kPa
d. 2300 kPa
Answer:
b. 485 kPa
Explanation:
Gay-Lussac's law express that the pressure of a gas under constant volume is directly proportional to the absolute temperature. The equation is:
P1T2 = P2T1
P is pressure and T absolute temperature of 1, initial state and 2, final state of the gas
Where P1 = 74psi
T2 = 20°C + 273.15 = 293.15K
P2 = ?
T1 = (95°F -32) * 5/9 + 273.15 = 308.15K
Replacing:
74psi*293.15K = P2*308.15K
70.4psi
In kPa:
70.4psi * (6.895kPa / 1psi) =
b. 485 kPawhat does the distance traveled by each component on the paper strip in paper chromatography depend on
Answer:
PLZ FOLLOWING ME.........................
Which of the following is not a renewable source of energy?
1.) geothermal
2.) coal
3.) solar
4.) wind
2. Coal
It is non renewable energy source.
Answer: the answer would be coal
Explanation: hoped this helped!
24.
What is the molar mass of CO2?
Answer:
The molecular mass of carbon dioxide is 44.01amu
A buffer solution is prepared by adding NaC2H2O2 to a solution of HC2H2O2 (acetic acid). HC2H3O2(aq) = H+ (aq) + C2H302 - (aq) What happens if KCl is added
Answer:
pH is not been modified. No changes.
Explanation:
Our buffer is made of acetic acid, a weak one and the salt from its conjugate base, sodium acetate.
NaC₂H₃O₂ → Na⁺ + C₂H₃O₂⁻
The acetate anion can make hydrolisis in water to produce acetic acid again.
C₂H₃O₂⁻ + H₂O ⇄ C₂H₃O₂H + OH⁻ Kb
KCl is neutral salt. When we dissociate it:
KCl → K⁺ + Cl⁻
Both ions come from a strong base and a strong acid. They won't make hydrolisis in water because they are conjugate weak acid and base
K⁺ + H₂O ← KOH + H⁺
Cl⁻ + H₂O ← HCl + OH⁻
These reactions can't be possible.
That's why it doesn't occur anything in our buffer, this salt does not give OH⁻ or H⁺ to medium to modify pH
What would be the temperature change if 3.0 g of water absorbed 15 J of heat? Specific Heat capacity of water= 4.18 J/gºC
Question 19 options:
a
None of the above
b
2.4 ºC
c
1.2 ºC
d
15 ºC
Which of the following best explains the relationship between peak to peak amplitude and semi amplitude
Answer:
Which of the following best explains the relationship between peak-to-peak amplitude and semi-amplitude? Semi-amplitude is half the distance of the peak-to-peak amplitude. Semi-amplitude is the same distance as the peak-to-peak amplitude.