Answer:
The measurement is precise and accurate
Explanation:
The accuracy of a measurement of length is often indicated by how "precisely" the length measurement can be read depending on the type of measuring instrument used scale.
Looking at the measurement, we can see that the values lie between ±0.1 from the expected values hence it is accurate.
Also, the values differ from each other by ±0.1 hence it the measurements are precise.
Answer:
Accuracy:
5.5 = 98.15%
5.3 = 98.15%
5.4 = 100 %
Precision:
5.5 ± 0.14
5.3 ± 0.14
5.4 ± 0.14
Explanation:
Accuracy is determined using; 100% - % error
% error = absolute error/actual value * 100%
5.5 - 5.4/5.4 * 100% = 1.85%
accuracy = 100 % - 1.85 % = 98.15%
5.3 - 5.4/5.4 * 100 5 = 1.85%
accuracy = 100 % - 1.85 % = 98.15%
5.4 - 5.4/5.4 * 100 % = 0 %
accuracy = 100 % - 0% = 100%
Precision is determined by obtaining the standard deviation of the mean;
s = √{∑(|x - m|)²/(n - 1)}
where x is the value, m is mean of values , n is number of values
mean = (5.5 + 5.3 + 5.4) / 3 = 5.4
deviations from mean, (x - m) are as follows;
|5.5 - 5.4| = 0.1
|5.3 - 5.4| = 0.1
|5.4 - 5.4| = 0
∑(x - m)² = (0.1 + 0.1 + 0) ²= (0.2)² = 0.04
(n - 1) = 3 - 1 = 2
s = √(0.04/2)
s = ± 0.14
Therefore, the precision of each measurement is as follows;
5.5 ± 0.14
5.3 ± 0.14
5.4 ± 0.14
Julio eats a taco for dinner. What represents a physical change in the taco?
A) saliva changing the starch in the crust to sugar
B) teeth tearing off a bite of a taco
C) chemicals in the stomach digesting proteins
D) breaking down of fats in the taco by bile
The physical change is a modification in the structure of the chemical substance. Teeth tearing off a bite of a taco represents a physical change. Thus, option B is correct.
What is a physical change?A physical change is an alteration in the structure of the chemical involved in the substance. In a physical change, the composition of the chemical remains intact and does not change. It includes changes in texture, temperature, shape, and phase of matter.
The processes like dissolving, boiling, cutting, melting, bending, and freezing are said to be physical changes. The teeth-bitting tacos result in smaller bites is a physical change as there is a change in the shape and size but not the composition.
Therefore, option B. the teeth tearing tacos is an example of physical change.
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1. The answer to the research question is the...
A. Claim
B. Evidence
C. Reasoning
2.The scientific data used to prove your point is the...
A. Claim
B. Evidence
C. Reasoning
Answer:
1. A claim
2. B evidence
In the outer layer of the sun, energy is transported outward by the rising of hot plasma and sinking of cooler plasma. This transfer is known as __________.
a.Electromagnetic radiation
B.Convection
C. Solar flares
D. Conduction
Answer:
solar flares
Explanation:
We have that The outward transportation of sun rays by the rising of hot plasma and sinking of cooler plasma is Known as
Solar flaresOption D
From the question we are told
In the outer layer of the sun, energy is transported outward by the rising of hot plasma and sinking of cooler plasma. This transfer is known as __
Generally
When the sun give off Heat energy it does this by the rising of hot plasma and sinking of cooler plasma
This Process is defined by scientist around the world as Solar flares and this
is the reason why the rays if the sun reaches earth.
Therefore
The outward transportation of sun rays by the rising of hot plasma and sinking of cooler plasma is Known as
Solar flares
Option D
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Nuclear chemistry findings contradict __________________ theory of indivisible atoms.
Answer:
atomic theory
Explanation:
what are 3 examples of pairs of atoms with polar covalent bonds?
Answer:
Water - H2O
Ammonia - NH3
Sulfur dioxide - SO2
Hydrogen sulfide - H2S
Ethanol - C2H6O
Explanation:
Those are some atoms with polar covalent bonds. Hope this helps!!
The atomic mass of Gallium is 69.72 AMU. The masses of the naturally occurring isotopes are 68.9257 AMU and 70.908 AMU for Ga-69 and Ga-71. Find the percent (%) abundance for each.
Answer:
40.7% abundance of Ga-71
59.93% abundance of Ga-69
Explanation:
Given data:
Average atomic mass of Ga = 69.72 amu
Atomic mass of Ga-69 = 68.9257 amu
Atomic mass of Ga-71 = 70.908 amu
Percent abundance of each isotope = ?
Solution;
we know there are two naturally occurring isotopes of Ga.
First of all we will set the fraction for both isotopes
X for the isotopes having mass 68.9257
1-x for isotopes having mass 70.908
we will use the following equation,
68.9257x + 70.908 (1-x) = 69.72
68.9257x +70.908 - 70.908x = 69.72
68.9257x - 70.908x = 69.72 - 70.908
-1.9823x = - 1.188
x= 1.188/1.9823
x= 0.5993
0.5993 × 100 = 59.93 %
59.93 % is abundance of Ga-69 because we solve the fraction x.
now we will calculate the abundance of Ga-71.
(1-x)
1 - 0.5993 = 0.4007
0.4007× 100= 40.7 %
40.7 % for Ga-71.
how many pounds are in 14.8 grams
Answer:
0.03262841
I tried, hope this helps :)
Answer:
0.032 lbs
Explanation:
Divide the mass value by 454.
what is the primary difference between and hypothesis and a theory
A hypothesis, on the other hand, is similar to a theorem, but it stands pretty much on its own and is not known to be linked to other theorems in any way. A hypothesis usually has no compelling reasons to be true or false. Hypotheses can be classified into the following categories:
The degrees of freedom of a theory have not yet been determined. These could be properties of a theory that haven't been fully determined yet. A theory can be expressed in a finite number of ways, and accepting one of them is referred to as "forming a hypothesis." It's about the aspects of a hypothesis that aren't fully formed yet.Once evidence is discovered, a hypothesis may evolve into a theory.A hypothesis that could become a theory if a mathematical formulation can be established.A hypothesis based on common sense and known theories that is not intended to become part of a bigger theory, but rather to explain a single fact. This could include things like beliefs regarding the formation of the earth.A theory derives a large number of predictions from a limited number of theorems or assumptions, which fall into the following categories:
Things we already knew to be true and can be explained by other theories.Things we previously knew to be true, but which no other theory could explain or predict.Things that we didn't know were true but were later confirmed to be true.Things we didn't realize were true, and don't know if they are still true, but don't contradict current measurements.TRUE or FALSE: Any measurement that has been cubed is volume.
Answer:
True
Explanation:
Volume is measured in "cubic" units. The volume of a figure is the number of cubes required to fill it completely, like blocks in a box. Volume of a cube = side times side times side. Since each side of a square is the same, it can simply be the length of one side cubed.
i need some help only answer if you are 100% sure
Answer:
poles
Explanation:
Which of the following is a unit for acceleration?
A) m/s
B) m/s2
C) s/m 2
D) s/m
When an extended structure is dissolved in water, it releases potassium (K) and chlorine (Cl) atoms in the
water
Which statement correctly describes the nature of this substance?
A.It is made of K and Cl atoms.
B.It is made of K molecules and Cl atoms.
C.It is made of K atoms and Cl molecules.
D.It is made of KCl molecules
Answer:
A.It is made of K and Cl atoms.
Explanation:
An atom is the smallest indivisible unit of an element while a molecule is the smallest particle of an element/compound that retains its chemical properties. However, the molecule is two or more atoms held together by means of a chemical bond e.g. Cl2 molecule consists of two atoms of Chlorine.
Hence, if an extended structure dissolves in water to release pottasium (K) and Chlorine (Cl) atoms, it means it is made up of K and Cl atoms. This is because the substance will dissociate l, in the presence of water, into it's simplest form which is the atomic level.
What is the relationship between the kinetic energy of molecules in a solid and a liquid? Justify your response in two or
more complete sentences.
LEDE
Answer:
In solid the molecules are soo close so tht cant move and also have bonds but in liquid molecules are far and move so thats y liquid don has its own shape
Answer:
In solid the molecules are soo close so tht cant move and also have bonds but in liquid molecules are far and move so thats y liquid don has its own shape
Explanation:
Protons with different number of nuetrons are called?
Answer:
Atoms of a particular element must have the same number of protons but can have different numbers of neutrons. When an element has different variants that, while all having the same number of protons, have differing numbers of neutrons, these variants are called isotopes.
hope this helps
True or False. The speed of light is sped up by dense media.
Answer:
false
Explanation:
According to the laws of reflection, the speed of light is slowed down by denser media, hence the statement is false.
What is reflection?Reflection of light is defined as a property of light ray that when it strikes a smooth surface it bounces back .Objects can be seen due to this property of light.Reflection is produced by all types of waves namely sound waves, light waves, electromagnetic waves.
Reflection of light is governed by laws of reflection which are also called as Snell's laws. According to laws of reflection, angle of incidence and angle of reflection are equal.The incident ray , reflected ray and normal all lie on the same side of the plane.Light travels in a straight line before, after and during the process of reflection.There are 3 types of reflection which are diffuse reflection,specular reflection and glossy reflection.
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What is the relationship between temperature and pressure?
Write your own response in your own words.
Answer:
Pressure is the force per unit area pounded onto the surface of a container of a gas or liquid. It's interesting to notice that the units of pressure (force/area) are the same as the units of energy density (energy/volume). This gives rise to the interesting result that the pressure at the centers of stars that we think should be sustaining the star against collapse actually attracts more pressure, at high enough pressures, and contributes to collapse
Explanation: this is what i would put ^-^
30 Points!! 15 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer: 22: C
23: A
24: A
25: D
26: B
Explanation: I hope that this helped :)
Answer:
22) b. stainless steel.
23) c. they are all substances.
24) b. a compound can only be separated into its components by chemical means.
25) a. substances are compounds, mixtures are not.
26) b. capitalized
extra: not 100 percent sure of 25
Why is the reactivity of metal increase but that of non-metal decreases as we go down in a group of periodic table? (pls its important i need this question's ans for my exam so answer it fast thank you)
Answer:
Nonmetal reactivity decreases down a group because the nucleus' ability to gain more valence electrons weakens due to more nuclear shielding. For Metals: the most reactive metals are those that can lose their valence electrons the most easily. ... Francium is the most reactive metal
Explanation:
Answer:
While moving from top to bottom in a group of the periodic table, the reactivity of non- metals decreases. ... Thus, the tendency of gaining electron/s in the valence shell decreases as well as the chemical reactivity also decreases on moving from top to bottom in a group of non- metals.
The mass of an oxygen–18 atom is 18.0042 amu. Compute the calculated mass.
Answer:
The calculated mass of one atom of oxygen-18 is approximately 2.99×10⁻²³ grams
Explanation:
The given mass of an oxygen-18 atom = 18.0042 amu
The definition of the atomic mass unit is the mass equivalent to the mass of one twelfth the atomic mass of one atom of carbon-12. The atomic mass unit is used to express the mass of an isotope of an element
1 amu = 1.66 × 10⁻²⁴ grams
Therefore;
18.0042 amu = 18.0042 × 1.66 × 10⁻²⁴ grams ≈ 2.99×10⁻²³ grams
The calculated mass of one atom of oxygen-18 ≈ 2.99×10⁻²³ grams
The atomic mass unit can be taken as the mass in grams of one mole of the substance
Therefore, the mass of one mole of the oxygen 18 atom = 18.0042 g
Please can i have help on these two multiple choice questions.I’ll be so grateful!!!
Answer:
1(neutrons) 2(protons)
Explanation:
HURRY!! Solve. C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g)
What is the Enthalpy of reaction?
What is the total Enthalpy of Reactants and Products? (Kj/Mol)
Is this a endothermic or exothermic reaction?
Answer: hope this helps!
Explanation:
Explain in steps how to find volume of a rock that is not rectangular water displacement
name the elements that determine the weather of a place....
Which statement correctly describes the reactivity of noble gases, according to the octet rule?
Their atoms have one electron in their valence shells, so noble gases are very reactive.
Their atoms have eight electrons in their valence shells, so noble gases are very unreactive.
Their atoms have one electron in their valence shells, so noble gases are very unreactive.
Their atoms have eight electrons in their valence shells, so noble gases are very reactive.
A Solution is a mixture of two or more substances_____
O a in water
O b. seperate from one another
O c in the same phase
Od come to room temperature
Answer:
In the same phase
Explanation:
Because when you make a solution you have to keep them in the same phase or you will oof.
.
The skydiver will soon open her parachute. How will her velocity change when
the parachute first opens?
Answer:
How will her velocity change when does parachute first open?
The skydiver's weight is balanced by the air resistance. There is no resultant force and the skydiver reaches terminal velocity. When the parachute opens, the air resistance increases. The skydiver slows down until a new, lower terminal velocity is reached.
When a skydiver opens their parachute, they accelerate upwards. This is not the same as saying the move upwards. Acceleration is a change in velocity. They keep feeling an upward force (while moving downward) that slows them until they get to a new terminal velocity.
What force changes when a parachute opens?
An open parachute increases the cross-sectional area of the falling skydiver and thus increases the amount of air resistance which he encounters (as observed in the animation below). Once the parachute is opened, the air resistance overwhelms the downward force of gravity.
What happens if you open the parachute too early?
You are likely to drift off the drop zone. The winds can be pretty heavy at high altitudes, and unless you steer continuously they may blow you off-course. Needless to say, the refrigeration effect of the wind and slipstream will make you feel even colder than the mere altitude. Your landing is likely to be rough.
the number of atoms in 2.0 moles of B is
Answer:
The answer is
1.204 × 10²⁴ atoms of BExplanation:
To find the number of entities of a substance given it's number of moles we use the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 2.0 moles
We have
N = 2 × 6.02 × 10²³
We have the final answer as
1.204 × 10²⁴ atoms of BHope this helps you
Number of moles of boron (B) = 2
To Find :We have to find number of atoms present in the given amount of boron[tex].[/tex]
Solution :➤ We know that 1 mole of substance contains 6.022×10²³ particles (atoms/molecules).
Avogadro's no. = 6.022 × 10²³★ Number of atoms present in B :
⭆ N = n × [tex]\sf{N_A}[/tex]
N denotes number of atomsn denotes mole number[tex]\sf{N_A}[/tex] denotes avogadro's number⭆ N = 2 × 6.022 × 10²³
⭆ N = 12.044 × 10²³
⭆ N = 1.2 × 10²⁴
Hope It Helps!15 Points For A Unnecessary Question, Is It Bad If I Drink Water With Food Coloring?
Yes
No
Answer:no
Explanation:as long as it’s not too much of it then no , it’s not bad . food coloring gets tested to be safe for human consumption so you’re good
Food coloring should be edible and safe on food (hence the name). If it's safe on food, then it should be safe to drink with water. Of course check with the label to be sure.
Patrick did an experiment to study the solubility of two substances. He poured 100 mL of water at 20 °C into each of two beakers labeled A and B. He put 60 g of Substance A in the beaker labeled A and 60 g of Substance B in the beaker labeled B. The solution in both beakers was stirred for 1 minute. The amount of substance left undissolved in the beakers was weighed. The experiment was repeated for different temperatures of water and the observations were recorded as shown.
Experimental Observations
Substance Mass of Undissolved Substance at Different Temperatures (gram)
20 ° 40 ° 60 ° 80 °
A 18 14 10 5
B 60 60 60 60
Part 1: Which, if any, substance is soluble in water?
Part 2: Explain how the data helped you determine solubility for both substances for temperatures 20 °C to 80 °C.
Answer:
1. SUBSTANCE A IS SOLUBLE IN WATER WHILE SUBSTANCE B IS INSOLUBLE IN WATER.
Looking at the information given in the question about the two substance, you will discover that 60 g of both substances were initially put in the beaker. While the mass of undissolved substance for substance A is variable, that of substance B remain constant at 60 g, this shows that the substance is not soluble in water.
2. Looking at the two substances given in the question, you will observe that for substance A, the degree of solubility in water decreases as the temperature of the water increases. For instance, at 20 degree Celsius, the mass of undissolved substance is 5 and as the temperature increases to 40, 60 and 80 degree Celsius, the mass of undissolved substances also increase to 10, 14 and 18 respectively. This shows that, the higher the temperature, the less of the substance will dissolve. For substance B, the mass of undissolved substance remain constant at all temperatures, which shows that the substance is insoluble in water. Thus, the data given helps to determine the solubility of the substance by giving the amount of substances that are insoluble at each temperature.
Explanation:
(C.6a) An atom of a neutral element contains 16 electrons. What element is it?
Answer:
Sulfur
Explanation:
