Answer:
The difference between accuracy and precision is both precision and accuracy are two ways of how scientists think about error. However, accuracy refers to or meaning to how close a measurement is to the true or accepted value. On the other hand, precision refers to or meaning to how close measurements of the same item are to each othe .... But scientists use the best quality of scientific observations and are both accurate and precise.
can someone help me pls
Answer:
I dont understand what the question means
Explanation:
How many grams of titanium metal can be produced if 12.5 of hydrogen gas reacts with excess titanium(IV) bromide(TiBr4)?
A. 6.25g
B. 148g
C. 47.9
D. 6.20g
The mass of titanium metal formed is 148g.
The equation of the reaction is;
TiBr4(s) + 2H2(g) ------>Ti(s) + 4HBr(g)
The number of moles of hydrogen gas = 12.5 g/2.00 g/mol = 6.25 moles of hydrogen gas
If 2 moles of hydrogen gas yields 1 mole of titanium metal
6.25 moles of hydrogen gas yields 6.25 moles × 1 mole/2 moles = 3.1 moles of titanium metal
Mass of titanium metal = 3.1 moles of titanium metal × 47.8 g/mol = 148g
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If 4.40 g of glucose are burned in a bomb calorimeter, the temperature of the 800 g of water in the calorimeter increases from 15.0∘C to 18.7∘C. If the heat capacity of the calorimeter is 550J∘C, what is the value of q for the combustion of the glucose sample?
Answer:
-14.4kJ
Explanation:
The value of heat energy in a bomb calorimeter with a glucose sample of mass 4.40 g if changes temperature from 15 to 18 degree celsius is 16369.54 kJ.
What is calorimeter?Calorimeter is a thermal device used to determine the heat evolved or absorbed from a reaction. From this we can also calculate the enthalpy change.
If the enthalpy is negative, then the reaction is endothermic. If enthalpy change is positive, then the reaction is exothermic. The equation for finding the heat energy q from the mass, temperature change and heat capacity of calorimeter is given below:
q = mc ΔT.
It is given that the total mass is 804.40 g and heat capacity of the calorimeter is 550 J/°C g, then the heat energy q is calculated as follows:
q = 804.40 g × 550 J/°Cg (18.7 °C - 15 °C)
= 16369540J
= 16369.54 KJ.
Hence, the value of q for the bomb calorimeter is 16369.54 KJ.
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What is the pH of a buffer made by combining 10.0mL of 0.51 M CH3NH2 with 10.0 mL of 0.61 M CH3NH3Cl? Kb CH3NH2 = 4.4 x 10-4
Answer:
10.57
Explanation:
pOH = pKb + log(acid/base)
The active ingredient in some insect repellents is N,N-diethyl-m-toluamide. How does this
insect repellent work? Which carboxylic acid and amine would be released by the hydrolysis of
this amide? Is this important?
The hydrolysis of N,N-diethyl-m-toluamide yields 3-methylbenzoic acid which easily biodegradable.
The insecticide repellent N,N-diethyl-m-toluamide is used to repel rather than kill insects. It functions by interfering with the ability of the insects to detect body heat and skin chemicals. In a nutshell, it confuses the receptors in the insect.
The hydrolysis of N,N-diethyl-m-toluamide yields 3-methylbenzoic acid and diethylamine as the products. This is important because the 3-methylbenzoic acid is not an environmental concern since it is readily biodegradable and does not accumulate significantly in living organisms. It has also not been found to be mobile in soil and water. Environmental concerns are always a prime consideration in assessing chemicals for use.
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PLEASE HELP ME WITH THISSSS!!!
Please help me with this it’s really hard to do :/
Answer:
8 is the answer.
Explanation:
100,000,1000
= 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10
= 10^8
When cleaning a buret
Answer:
1. Rinse with distilled water.
2. Avoid dropping it
3. Use a stopper and fill with water and shake
4. Dry
Please help I will mark brainlist
- answer & explain how u did that
[ lesson : molarity ]
18) What is the molarity of a bleach solution containing 9.5 g of NaOCI per liter of bleach?
19) How much calcium hydroxide (Ca(OH)2) in grams, is needed to produce 1.5 L of a 0.25M solution
Answer:
Q1) 0,1276 M
Molair mass of NaOCl = 74,44 g/mol
You have 9,5 g/L.
You need to calculate with the molar mass, how many moles 9,5 g are:
9,5 g / 74,44 g/mol = 0,1276 molAR
0,1276 mol / 1 L = 0,1276 M
Q2) 27.78 grams
The mass ca(Oh)2 needed to produce 1.5 l of 0.25 solution is calculated as follows
find moles
=moles = molarity x volume
moles is therefore = 1.5 x 0.25 = 0.375 moles
mass = moles x molar mass
0.375mol x 74.09 g/mol = 27.78 grams
Explanation:
NOW MARK ME AS THE BRAINLIEST
Please help me I don’t understand this much ://
Answer:
The answers are all small.
Explanation:
They are all small because a asteroid has a small amount of energy and produces a small amount a small crater. A small crater was likely formed by a small asteroid.
how do the methods of scientist lead to knowlodge
PLEASE HELP ME WITH THISSSS!!! Okay
Answer:
1. follow
2. corellation
3.does
Explanation:
i dont know for sure but I think those are the answers cause the two lines look around the same.
How does matter and energy cycle through an ecosystem?
a. Cellular respiration alone
b. The atmosphere
c. Photosynthesis and cellular respiration
d. Photosynthesis alone
Please help D;
100 POINTS!!!!!!! FAST PLEASE
A
Find a room that can be made completely dark. In the room, tape a piece of white paper on the wall at eye level. Turn on the flashlight, and turn off the lights in the room. Observe what the light looks like as it hits the white paper. Next, place the clear plastic in front of the flashlight. Does the plastic affect how the light hits the paper on the wall? If so, how?
B
Now place the waxed paper in front of the flashlight instead of the plastic. Does the waxed paper affect how the light hits the paper on the wall? Explain your response.
Answer:Plastic wrap is transparent and so nearly all light passes through easily ,
Wax Paper is translucent and so light is blurred or scattered .
Explanation:
What is Reflection ?
Reflection of light occurs when light hits a smooth surface that does not absorb any of the light but instead bounces it back off the surface.
A mirror is flat, smooth, and polished. When light hits a mirror it is not absorbed but is reflected off at a very predictable angle.
The angle that the light hits the mirror is called the angle of incidence.
The angle of light that bounces off the mirror is called the angle of reflection.
The Law of Reflection states that the angle of incidence is equal to the angle of reflection.
Plastic wrap is transparent and so nearly all light passes through easily ,
Wax Paper is translucent and so light is blurred or scattered .
Vehicles that are propelled by a conventional gasoline engine in tandem with an
electric motor powered by batteries are called hybridelectric vehicles (HIVs).
A.True
B.False
Which is the best description of a molecule?
Answer:
a molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms
Answer:
: A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.
Explanation:
i hope its right
solar radiation process explained
Answer:
Solar radiation is radiant energy emitted by the sun from a nuclear fusion reaction that creates electromagnetic energy. About half of the radiation is in the visible short-wave part of the electromagnetic spectrum. The other half is mostly in the near-infrared part, with some in the ultraviolet part of the spectrum.
Explanation:
Hope it helps
stan twice
Glycerol (molar mass 92.09 g/mol) has been suggested for use as an alternative fuel. The enthalpy of combustion, Δ
H°comb , of glycerol is −1654 kJ/mol. What mass of glycerol would need to be combusted to heat 500.0 g of water from 20.0°C to 100.0°C ? (The specific heat capacity of water is 4.184 J/(g⋅°C). Assume that all the heat released by the combustion reaction is absorbed by the water.)
The mass of glycerol to that would need to be combusted to heat 500.0g of water from 20.0°C to 100.0°C is; 9.32 grams.
We must establish the fact that energy is neither created nor destroyed.
Therefore, the amount of heat absorbed by water is equal to the amount of heat released by the combustion of glycerol.
Total heat absorbed by water, H(water) is;
Q(water) = m C (T2 - T1)
Q(water) = 500 × 4.184 × (100-20)
Q(water) = 167.36 kJ
Consequently, the quantity of heat evolved by the combustion of glycerol is;
Q(glycerol) = 167,360 J = n × ΔH°comb
where, n = no. of moles of glycerol.
167.36 kJ= n × 1654 kJ/mole
n = 167.36/1654
n = 0.1012 moles of glycerol.
Therefore, mass of glycerol combusted, m is;
m = n × Molar mass
m = 0.1012 × 92.09
m = 9.32 g.
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A liquid has a density of 270 g/L. What would its density be in kilograms per gallon?
Answer:g
Explanation:
g
30 points for you if anyone answers with an explained answer ill mark you Brainliest!
Answer:
g/kg
Explanation:
they are both a unit of weight
notice how the others have a unit of weight and then measurement? g/kg are two units of weight
PLEASE GIVE BRAINLIESTAnswer:
Grams/kg
Explanation:
write all of the allowed sét of quantum numbers for a 3p orbital
Answer:
Which of the following is a possible set of quantum numbers for a 3p orbital?
Since you are dealing with a 3p-orbital, your principal and angular momentum quantum numbers will be n=3 and l=1 .
The process of splitting an atom into two nuclei with smaller masses is called _____.
a. nuclear fusion
b. transmutation
c. chain reaction
d. nuclear fission
Answer:
D nuclear fission, the process where the nucleus of an atom is split into two or more smaller nuclei. Nuclear fusion is the reaction of the combination of nuclei.
Answer please I give lots of points
Answer:
4
Explanation:
How can you tell baking a cake produces a chemical change?
Answer: see below
Explanation:
1. Change in smell
2. Heat given off
3. New substance (cake) cannot be separated into the original ingredients
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what chemical property is used when cooking
Answer:
Chemical properties of food are those properties that cannot be measured without altering the chemical composition of the food material.
Explanation:
Answer:
The property of chemical reactive foods is used.Let's take an example of cooking an egg.Cooking an egg is a chemical reaction because you can't change cooked egg into raw or its previous state.There are two types of reactions
Physical reactionChemical reactionDuring oxidation of ethanol to ethanol, the ethanol formed was found to be contaminated with unconverted ethanol, describe how you would obtain ethanal free from ethanol
uihehdhdhjbsjwiiqbs vs
Caffeine is used commercially as a
carbon dioxide+water+Adenosine Triphosphate
Which of the following levels of organization is the largest
•organ
•organ system
•tissues
•atom
Answer:
Organ system
Explanation:
Sugar dissolves in water. Which statement best describes what is happening? (1 point) Sugar stays together but in a liquid form that can no longer be seen in the water. Sugar stays together but in a liquid form that can no longer be seen in the water. Sugar slowly melts, turning from a solid to a liquid and combining with the water. Sugar slowly melts, turning from a solid to a liquid and combining with the water. The water molecules in sugar will separate from each other and combine with the water, releasing the sweetness into the water. The water molecules in sugar will separate from each other and combine with the water, releasing the sweetness into the water. A large collection of sugar molecules break into individual molecules and disperse in the water.