Maggie loves fresh brownies, and her grandma told her if she places a piece of bread in the storage container with the brownies, the brownies will stay fresh and moist longer. Maggie decides to test this idea. She bakes a batch of Betty Crocker brownies. She places 6 brownies in 6 individual tupperware containers. Each brownie is the same size and placed in the same location. She adds a piece of bread to three of the brownie containers, and leaves the other three alone. Each day for three weeks she measures the moistness of the brownies and records her results. What is the independent variable? What is the dependant variable? What are the constants? Hypothesis? What are the control groups? What is the experimental group?

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%.

It is the abundance of isotopes of a chemical element as naturally found on a planet.

Based on the given information:

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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Answer:

mixture

Explanation:

Answer:

Explanation:

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.

Answer:

The 49th Parallel and the 60th Parallel are the most significant.

Answer:

4 significant figures

Reason

The reason is count from 9 and all the decimal. it would be different if there was 0.09768.

Element symbol V

Atomic Number 23

Mass Number 50.9415

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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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

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:

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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.

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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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.

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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Answer:

Milorganite 0636 Organic Nitrogen Fertilizer

Explanation:

According to  gardenhelpful.com they list a few grass proudcuts to make your grass more green.

Magnesium ( Mg+² ) has a full outer shell .

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.

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.

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.

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

Answer:

D is the answer

Explanation:

distillation

Answer:

distillation

Explanation:

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].

A litre is a unit of volume in the metric system. Hence, option B is correct.

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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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.

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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Answer:

Platinum

Explanation:

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.

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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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.

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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Answer:

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