Answer:
Independent variable - Piece of bread
Dependant variable - Moistness of brownie
Constants- Same size and location of brownie
Hypothesis - IF a piece of bread is added to a brownie container, THEN the brownie will be moister
Control groups- The set of brownie containers she adds no piece of bread to
Experimental group- The set of brownie containers she adds a piece of bread to
Explanation:
The hypothesis in an experiment is a testable explanation to a given problem, which is whether a piece of bread can make brownie moist in this question. Hence, a possible hypothesis will be: IF a piece of bread is added to a brownie container, THEN the brownie will be moister
Independent variable is the variable that the experimenter changes or manipulates in the experiment. In this case, the independent variable is the PIECE OF BREAD added to the brownie.
The dependent variable is the variable that is being measured in an experiment. The dependent variable in this case is the MOISTNESS of the brownie
Constants are variables that the experimenter keeps unchanged for all the groups throughout the experiment. In this case, the constants are SAME SIZE AND LOCATION OF BROWNIE.
Control group is the group that does not receive the experimental treatment or independent variable while the experimental group is the group that receives the experimental treatment. The control group in this experiment is: The set of brownie containers she adds no piece of bread to, while the experimental group is the: The set of brownie containers she adds a piece of bread to
546000000 in scientific notation
Answer:
5.46x[tex]10^{8}[/tex]
Explanation:
just move the decimal however many places to the left until there is only one digit to the left of it and then square the ten by that number
How many significant figures are in this number?
9.678 grams
Answer:
4 significant figures
Reason
The reason is count from 9 and all the decimal. it would be different if there was 0.09768.
There are three stable isotopes of magnesium. Their masses are 23.9850, 24.9858, and 25.9826 u. If the average atomic mass of magnesium is 24.3050 u and the natural abundance of the lightest isotope is 78.99%, what are the natural abundances of the other two isotopes?
Answer:
²⁵ Mg = 10.00%
²⁶ Mg = 11.0%
Explanation:
Given that:
Magnesium ²⁴Mg has an abundance of 78.99%
Hence, (100 - 78.99)% = 21.01%
21.01% is the abundance of ²⁵ Mg and ²⁶ Mg
Suppose,
²⁵ Mg = x
²⁶ Mg = (21.01 - x)%
Then;
avg. atomic mass = [tex]\dfrac{78.99}{100 }(23.9850)+\dfrac{x}{100}(24.9858) +\dfrac{21.01-x}{100}(25.9826)[/tex]
where the avg. atomic mass = 24.3050
∴
[tex]24.3050 \times 100 = {78.99}(23.9850)+\dfrac{x}{100}(24.9858) +\dfrac{21.01-x}{100}(25.9826)[/tex]
2430.5 = 2440.46915 -0.9968 x
0.9968x = 2440.46915 - 2430.5
0.9968x = 9.96915
x = 9.96915/0.9968
x = 10.00%
∴ Recall that:
²⁵ Mg = x
²⁶ Mg = (21.01 - x)%
²⁵ Mg = 10.00%
²⁶ Mg = (21.01 - 10.00)%
²⁶ Mg = 11.0%
The natural abundances of the other two isotopes, that is, Mg-25 and Mg-26 are 10% and 11.01%.
What is Natural abundance?It is the abundance of isotopes of a chemical element as naturally found on a planet.
Based on the given information:
The three stable isotopes of Mg are Mg-24, Mg-25 and Mg-26. The natural abundance of the lightest isotope, that is, Mg-24 is 78.99%. The masses of the isotopes are 23.9850 u, 24.9858 u and 25.9826 u. The average atomic mass of Mg is 24.3050 u.Now the natural abundance of all the isotopes of Mg is 100%.
Mg-24 + Mg-25 + Mg-26 = 100
Mg-25 + Mg-26 = 100-78.99
Mg-25 + Mg-26 = 21.01
Now let us assume that Mg-25 is x% then Mg-26 will be (21.01% -x).
Now,
Average atomic mass of Mg = [(Natural abundance of Mg-24) × (isotopic mass of Mg-24) + (Natural abundance of Mg-25) × (Isotopic mass of Mg-25) + (Natural abundance of Mg-26) × (Isotopic mass of Mg-26)]
Putting the values we get,
24.3050 amu = (78.99% × 23.9580 amu) + (x% × 24.9858 amu) + (21.01% - x%) × 25.9826 amu
24.3050 amu = 18.9458 + 24.9858 × x + 5.4589 - (25.9826x)
24.3050 = 24.4047 - (0.9968x)
0.9968x = 24.4047 - 24.3050
x = 0.1000
x = 10%
The natural abundance of Mg-25 is 10%.
The natural abundance of Mg-26 = 21.01% - x% = 21.01% - 10% = 11.01%.
Thus, the natural abundances of the other two isotopes are 10% and 11.01%.
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6 A student has a mass of 6.35 x 10^1 kg. What number below is the
equivalent to the student's mass? *
O A. 6.35 x 10^-2 g
B. 6.35 x 10^4 g
O C.635 g
O D. 215 lb.
Answer:
B. 6.35 x 10^4 g
Explanation:
Quantities such as mass have more than units that are interconvertible. Mass can be measured in kilograms (kg), grams (g), etc.
However, 1kg equals 1000grams
Hence, a measurement of 6.35 x 10^1 kg will be equivalent to grams (g) by multiplying by 1000units
That is, 6.35 × 10^1 × 1000
= 6.35 × 10^1 × 10^3
Multiplication in index means to add the powers
= 6.35 × 10^ (1+3)
= 6.35 × 10^4grams
Therefore, an equivalent measurement of 6.35×10^1 kg is 6.35×10^4 g.
Which of the following is not an example of making a measurement?
Answer:
C
Explanation:
Measurements are always specific numerical values that you observe. Taking your temperature results in a number. Reading your watch results in a specific time that you get. Weighing a cantaloupe results in a specific measurement in kilograms or pounds. Asking the weather will result in an answer, like sunny or rainy, which aren't specific numerical values.
The following is not an example of making a measurement is asking for weather as it depends on weather reports. option C is correct.
What is weather report?A weather report is what tells you about the high and low temperatures for the past day o weather the rain is going to happen or not which can be predict only.
Weather report also tells you the present temperature of the day and may tell you the average temperature for the day which can only be predict cannot be measured in any aspect.
Therefore, following is not an example of making a measurement is asking for weather as it depends on weather reports. option C is correct.
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Which of the following atoms has a full outer shell?
A. Ca
B. Li-1
C. Mg+2
D. N-2
Magnesium ( Mg+² ) has a full outer shell .
Reason:-K and L shells of an atom are full , then it will have a total of 2 + 8 = 10 electrons in it . We know that magnesium has 12 electrons in it . Magnesium having 2 free electrons.
Hi! I need help on 1-4 ASAP! Thanks!
Answer:
5. a. false b. true c. false d. true e. false
6. it has to be something that can be supported or refuted through carefully crafted experimentation or observation
On a rollercoaster ride, when do the cars have the most kinetic energy?
Atoms of two different elements must have different electrical charges. numbers of neutrons. atomic numbers. energy levels.
Answer:
atomic numbers
Explanation:
Atoms are the unit of molecules and compounds or matter. They have their atomic numbers and mass. Atoms of different elements must have different atomic numbers. Thus, option C is correct.
What is an atomic number?An atomic number is the total number of protons in a nucleus that is an essential factor in determining the place and position of the atom in the periodic chart.
Though the nucleus is made of neutrons and protons, the atomic number is only defined by the number of protons alone. Hence, the number of protons is equivalent to the atomic number.
The number of the protons and neutrons together makes the atomic mass of the element that is expressed at the lower of the symbol, whereas the atomic number is written at the upper of the symbol.
Therefore, the atomic number is different in each atom.
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Although alchemy has many definitions, including a way of thinking philosophically about stuff by changing it, what word that is still used today is derived from alchemy?
Answer:
ChemistryExplanation:
Chemistry is derived from Alchemy. Alchemy is derived from al-chemiya, Kimiya is an Arabic word.
Chemistry is branch of science that involves study of structure of atoms and molecules, investigation of their properties , the changes that occur during chemical reactions and using the chemical reactions to form new substances. It has five branches: Analytical, Organic, Inorganic, Physical and Biochemical.
In J.J. Thomson's plum pudding model of the atom, the plums represent
and the pudding represents
A
large neutral charged mass, large positively charged mass
B)
large positively charged mass, electrons
electrons, large positively charged mass
electrons, large neutrally charged mass
Answer:c
Explanation:
I put a and got it wrong and c was correct
J.J. Thomson gave the plum pudding model for the atomic structure. The model represents the plums by electrons and pudding as large positively charged masses. Thus, option c is correct.
What is the Plum pudding model?The Plum pudding model was given by J.J. Thomson to represent the sub-atomic particles of the atom and their distribution. The plum was used to depict the electrons that carried a negative charge.
The pudding represented the protons that were present like the sea and covered the whole atom. The protons carried a positive charge and according to the model were distributed fully in the atom.
It was an important discovery and model that gave rise to more accurate models. The model proposed the presence of the electrons that later were considered of crucial importance.
Therefore, option c. the plum is electron embedded in the pudding of the protons.
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i need help please with questions 35+38
Answer:
vznzbzvbajavavsytttuydr
the pencil is material or mixture ?please help
Answer:
mixture
Explanation:
if an atom has two additional valence electrons than the original element has, what would be the charge of the atom
Which element has the greatest average atomic mass? iodine bromine tellurium krypton
Answer:
The answer is C. Tellurium.
Explanation: If you look at the periodic table, tellurium is shown to have the greatest atomic mass. It is calculated easily. The answer is right on edge 2020.
Tellurium is the element having highest atomic mass.
Tellurium is the element has the greatest average atomic mass followed by iodine, krypton and bromine. The atomic mass of Tellurium is 127.6 u, the atomic mass of iodine is 126.9 u, the atomic mass of krypton is 83.8 u and the atomic mass of bromine is 79.9 u so on the basis of given data we can say that tellurium is the element that has the highest atomic mass or mass number.
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What types of fertilizer will make grass grow greener?
Answer:
Milorganite 0636 Organic Nitrogen Fertilizer
Explanation:
According to gardenhelpful.com they list a few grass proudcuts to make your grass more green.
What are the answers for this
Answer:
Solid:
shape: definite
volume:definite
closeness...: tightly packed
motion ..: vibrate in their position
liquid:
shape: indefinite
volume: definite
closeness: loosely packed
motion... : slide past each other
gas:
shape: indefinite
volume: indefinite
closeness: far apart
motion..: random movement
Explanation:
hope this helped you .. please mark as brainliest
1. For each of the following numbers, by how many places must the decimal point be
moved to express the number in scientific notation?
II. For each number, will the exponent be positive, negative, or zero?
0.0000089911
Tokyo, Japan is 8817.6 km from California. how many millimeters is this? answer in scientific notation.
Answer:
[tex]d=8.817\times 10^9\ mm[/tex]
Explanation:
It is given that,
Japan is 8817.6 km from California. We need to convert this distance in millimeters.
We know the conversion from km to mm is as follows :
1 km = 1000000
To convert mm km to mm use the unitary method as follows :
8817.6 km = 8817.6 × 1000000
[tex]d=8.817\times 10^9\ mm[/tex]
Hence, the distance between Japan and California [tex]8.817\times 10^9\ mm[/tex].
Which parallel runs through Canada
Answer:
The 49th Parallel and the 60th Parallel are the most significant.
an atom has 23 protons, 25 neutrons and 23 electrons.
what is the element symbol
what is the atomic number
what is the mass number
Element symbol V
Atomic Number 23
Mass Number 50.9415
What is the atomic number?The atomic number is the number of protons in the nucleus of an atom.
Vanadium is a chemical element with the symbol V and atomic number 23. Classified as a transition metal, Vanadium is a solid at room temperature.
Hence,
Element symbol V
Atomic Number 23
Mass Number 50.9415
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What is the speed of 550 meters per second in kilometers per second?
Which of the following is a unit of volume in the metric system? (5 points)
Gallon
Liter
Pint
Quart
A litre is a unit of volume in the metric system. Hence, option B is correct.
What is volume?Volume – How much space an object or substance takes up.
Measured in cubic meters (m3), litres (L) & millilitres (mL).
Volume is the measure of the 3-dimensional space occupied by matter, or enclosed by a surface, measured in cubic units.
The SI unit of volume is the cubic meter (m3), which is a derived unit.
Volume is the measure of the capacity that an object holds.
For example, if a cup can hold 100 ml of water up to the brim, its volume is said to be 100 ml.
Volume can also be defined as the amount of space occupied by a 3-dimensional object.
Hence, option B is correct.
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Un buzo que nada en las profundidades despide pequeñas burbujas de aire¿Aumenta disminuye o permanece igual el tamaño de las burbujas conforme suben a la superficie?
Answer:
Al ascender las burbujas van aumentando de tamaño.
Explanation:
Las burbujas que produce el buzo debajo del agua son pequeñas moléculas de dióxido de carbono gaseoso producto de la respiración del mismo.
Ahora, a medida que las burbujas suben a la superficie, la presión que sufren estas (Presión debido al agua), es menor conforme van ascendiendo debido a la ley de Boyle: A medida que la presión aumenta, el volumen va disminuyendo.
Esto significa que al ascender las burbujas van aumentando de tamaño debido a que la presión que sufren estas es menor que cuando están a mayores profundidades.
When sugar is fermented, alcohol is produced. What other substance is produced? Also.. What effects does this substance have in (i) baking (ii) beer brewing.
ANSWER: It's (ii) I do believe
The sugar is fermented and the ethanol and carbon dioxide are produced. The fermentation of ethanol is used in bread baking and the fermentation found in grapes makes beer.
What is fermentation?Fermentation is the mechanism by which sugar is converted into alcohol. Ethanol Fermentation can be described as a biological process that converts sugars such as glucose, sucrose, and fructose into cellular energy by producing ethanol and carbon dioxide as a side effect.
Alcoholic fermentation is called anaerobic since yeast conducts this transformation in the absence of oxygen. The fermentation of ethanol has applications such as the manufacture of alcoholic drinks, ethanol fuel manufacture, and bread baking.
Fermentation of the natural sugars can be seen in grapes creating wine or beer as well as in apples and pears producing cider and Perry, respectively. Alcoholic fermentation takes place in species of fish, where it offers energy when oxygen is scarce.
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Gravitational attraction exists between all objects in the universe. Which word, if any, should replace "all" in this statement to make the statement true.
Answer:
any two
Explanation:
Gravitation force or gravitational attraction is a force of pulling or attraction that exist between any two bodies that have a mass. Each and every body attract each other with the force of gravity due to their masses.
Every object in this universe having mass and distance attracts every other object.
______is used in production of hard disk. 1 platinum 2 silver 3 gold
Answer:
Platinum
Explanation:
Linh is analyzing a solution in a crime lab. He needs to determine what liquid was used to dissolve the other substances. Which method would best complete the task?
evaporation
filtration
decantation
distillation
Answer:
D is the answer
Explanation:
distillation
Answer:
distillation
Explanation:
9. The identity of an element can be determined on the basis of which one of the following?
A) The number of protons in an atom of the element.
B) The number of neutrons in an atom of the element.
C) The mass number of the element.
D) The atomic mass of the element.
0.056 g/s = ? g/min