What problem did the development of the metric system solve?
Answer:
The problems solved by the metric system includes, the eradication of fraud prevalent by the use of the approximately 800 units that were defined in 250 thousand ways due to the difference of the associated quantity to the units in different towns
The development of the metric system also solved the issues scientist had with working with the medieval system which were mainly national and regional systems that hindered scientific communication across regions
Explanation:
3. How many protons do the following have?
Calcium
Gold
Copper
Iron
Answer:
calcium=20
gold=79
copper=29
iron=26
Explanation:
1. Isotopes of are atoms of the same element that vary in
A. protons
B. neutrons
C. protons and neutrons
D. neutrons and mass
2. What do these 2 atoms have in common? B-10 and B-11?
A. both have same number of neutrons
B. both have 5 electrons
C. both have 6 protons
D. both have same mass
Explain how you got your answer
Answer:
1. D
2. B
Explanation:
1. Isotopes vary in neutrons. Due to this variance, the difference in neutrons change the mass of the element.
Note: the amount of protons in an element never changes. The number of protons (the atomic number on the periodic table) identifies the element in question. If you add or subtract protons, you change the element.
2. B-10 and B-11 are two isotopes of the element Boron: One with 10 neutrons, and another with 11 neutrons. Because they contain a variance of neutrons, they do not have the same mass. This cancels choices A and D.
The protons of an element are equal to the atomic number of that element. Borons atomic number is 5 (according to the periodic table), so it contains 5 protons. This cancels choice C as the element with 6 protons is Carbon.
Note: The amount of protons in an atom is balanced out by the same amount of electrons to allow for a neutral charge of the element (i.e., the protons, which contain a positive charge, and electrons, which contain a negative charge, cancel each other out. In the case of Boron: +5 protons - 5 electrons = 0 charge). This is why choice B is correct, as the consideration of an ion is not necessary for this question.
What is scientific notation
scientific notation is a mathematical way to turn large of small numbers into a simpler form.
ex. 9000000000 is 9*10^9 in scientific notation
ex. 0.000000009 is 9*10^-9 in scientific notation
28. Analyzing Results A pure white, solid material that
looks like table salt releases gas when heated
under certain conditions. There is no change in
the
appearance of the solid, but the reactivity of
the material changes.
a. Did a chemical or physical change occur? How do
you know?
b. Was the original material an element or
a compound?
Answer:
a :Chemical b : compound
Explanation:
a : it had to be a chemical change because it says "There is no change in
the appearance of the solid, but the reactivity of the material changes.
b : well it would be a compound because it would have to be to make a reaction
There is no change is the appearance of the solid, but the reactivity of the material changes. In case of question a :Chemical changes occur and in case of question b : The original material is compound.
What are the properties of a compound ?A compound is defined as the material that is composed up of two or more elements by chemically combined with each other in a fixed proportion by their mass.
Examples are Water, Sodium Chloride, Ammonium Chloride etc; They have a fixed melting and boiling points, a compound can be changed in chemical reaction and hence the components are mixed in a fixed proportion.
Two primary types of compounds are covalent and ionic compounds as it is bonded by covalent and ionic bond, the formation of covalent bond occur between two nonmetals, like water or methane. These molecules are neutral and weak.
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Which describes density? amount of volume for a given object ability of an object to take up space amount of mass in a given volume ability of an object to float in water
amount of mass in a given volume
Amount of mass in a given volume perfect describes the meaning of density. Hence option C is correct.
What is density?Density is the term used to describe the relation between the mass of the body and their volume. Density is a property that can be used to identify substances. Each substance has a unique density.
Example: wood ball density is less as compared to metal ball because wood ball is less than metal ball.
It describes how much matter is packed into a certain volume.
D = M/V
M =Mass (gram); V = Volume (ml or cm3); D = Density (gram/cm3)
Amount of mass in a given volume perfect describes the meaning of density. Hence option C is correct.
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A student needs exactly 1 gram of baking powder to conduct an experiment. The balance reads 0.37 grams. How
much more baking powder does the student need?
A. 50 grams
B. 63 grams
C. 75 grams
D. 36 grams
Answer:
B
Explanation:
If the student needs one gram but so far only has 0.37 grams, then the amount they need is the difference between what they need and how much they already have. 1-0.37=0.63 grams.
...which isn't actually an option because none of them have decimal points but I would say it is B anyway because it is the equivalent ratio and maybe there was a typo.
Hope this helped!
Answer:
The answer is B :)
Explanation:
What is the difference between a theory and a law in science
Which of the following statements describe P-waves? Select the two correct answers.
A. They are the first waves detected after an earthquake.
B. They are the most destructive earthquake waves.
C. They alternately compress and pull apart the partides in matter.
D. They can only travel through the solid rock inside Earth.
Answer: C- they alternately compress and pull apart the particles in matter
A -they ate the first waves detected after and earthquake
Explanation:
Answer:
A&C
Explanation:
APEEXX
HELP PLEASE ASAP I need a good explanation
Answer:
B
Explanation:
Hellium is a gas...
Solids are particles that are packed together
liquids are particles that are together but conforme to their container
gas have space between them and conform to their holder
A 253 g block of wood has the following dimensions: Length 15.24 cm Width 6.64 cm Height 3.56 cm What is the density of the wooden block?
Answer:
0.7 g/cm³
Explanation:
hey there,
< The formula for density is [tex]p = \frac{m}{v}[/tex] where m = mass, v = volume, and p = density. An easy way to remember the formula is density equals love. I found this easy to remember because p = ♡ and when you think about it, if you split the heart in half through the middle like a fraction, it will make [tex]\frac{m}{v}[/tex] (if you don't understand what I'm saying, try writing it out and you will be able to see what I'm talking about!)
We already know that the block is 253 g so the mass is 253 g.
To find the volume, always multiply the 3 values width, length, and height whenever you are trying to find the volume of a block.
15.24 cm x 6.64 cm x 3.56 cm = 360.25 cm³
Now plug it into the formula.[tex]p = \frac{m}{v}=\frac{253}{360.25} = 0.7 g/cm[/tex]³ >
Hope this helped! Feel free to ask anything else.
Density of a substance is its mass divided by volume. Volume of the cube is calculated to 360.24 cm³ and thus the density of the cube is 0.7023 g/cm³.
What is density?Density of a substance is the measure of its mass per volume. Thus mathematically it is the ratio of mass to the volume of th substance. Density of a substance depends on the bond type, mass, volume, temperature and pressure.
The ratio of density of a substance to the density of water is called specific gravity. If the specific gravity is greater than one the body will sink in water and if it is less than one it will float on water.
The mass of the block is given 253 g and the volume can be calculated from the product of length,breadth and height.
Volume = 15.24 cm × 6.64 cm × 3.56 cm
= 360.24 cm³.
Density = mass/volume
= 253 g/ 360.24 cm³
= 0.7023 g/cm³
Hence, the density of the block is 0.7023 g/cm³.
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Suppose now that you wanted to determine the density of a small crystal to confirm that it is phosphorus. From the literature, you know that phosphorus has a density of 1.82 . How would you prepare 20.0 mL of the liquid mixture having that density from pure samples of ( = 1.492 g/mL) and ( = 2.890 g/mL)? (Note: 1 mL = 1 .)
Answer:
Volume of [tex]CHCl_3[/tex] = 15.31 mL
Volume of [tex]CHBr_3[/tex] = 4.69 mL
Explanation:
Given that:
the density of the mixture = 1.82 g/mL
From the density of the pure samples
The density of [tex]CHCl_3[/tex] = 1.492 g/mL
The density of [tex]CHBr_3[/tex] = 2.890 g/mL
The total volume of the liquid mixture = 20.0 mL
Suppose the volume of [tex]CHCl_3[/tex] = P ml
and the volume of [tex]CHBr_3[/tex] = Q ml
the sum of their volumes should be equal to the total volume of the mixture
[tex]P \ ml + Q \ ml = 20 ml[/tex] ----- (1)
However, we know that Density = mass/volume
∴ mass = density × volume
The equation can now be expressed as:
[tex]\mathtt{(Density \ of \ CHCl_3 \times Vol. \ of \ CHCl_3 ) + (Density \ of \ CHBr_3 \times \ volume \ of \ CHBr_3)} = \mathtt{ (Density \ of \ mixture \times volume \ of \ the \ mixture)}[/tex]
1.492 g/mL × P mL + 2.890 g/mL × Q mL = 1.82 g/mL × 20 mL ---- (2)
From equation (1) ;
let Q = 20 - P
The replace the value of P into equation (2)
1.492 g/mL × P mL + 2.890g/mL × (20 - P) mL = 1.82 g/mL × 20 mL
1.492 P g + 57.8g - 2.890 P g = 36.4g
1.492 P g - 2.890 P g = 36.4g - 57.8g
-1.398 P g = -21.4g
P = -21.4g/-1.398g
P = 15.31 mL
Q = 20 - P
Q = (20 - 15.31) mL
Q = 4.69 mL
∴
Volume of [tex]CHCl_3[/tex] = 15.31 mL
Volume of [tex]CHBr_3[/tex] = 4.69 mL
A covalent bond is likely to be polar when ________. one of the atoms sharing electrons is more electronegative than the other atom carbon is one of the two atoms sharing electrons the two atoms sharing electrons are equally electronegative the two atoms sharing electrons are of the same elements 0
Answer:
one of the atoms sharing electrons is more electronegative than the other atom
Explanation:
A covalent bond is likely to be polar when one of the atoms sharing electrons is more electronegative than the other atom. Therefore, option (A) is correct.
What is a covalent bond?A covalent bond can be described as a chemical link formed by the exchange of electron sets between particles. A covalent bond can be formed by equal sharing of electrons from both contributing atoms.
The pair of electrons in this type of bonding is known as shared pair or bonding pair. Covalent bonds are the sharing of bonding pairs that will ensure that the atoms gain stability in their outer shell.
Elements with very high ionization energies are incapable of transferring electrons and elements having low electron affinity cannot accept electrons. Covalent bonding takes place between two non-metallic atoms characterized by the equal sharing of electron pairs between the atoms and other covalent bonds with an electronegativity difference is more than 2.0.
Therefore, the covalent bond can be polar if one atom is more electronegative than the other atom.
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. Identify each of the following statements as being most similar to a hypothesis, a law, or a theory. Explain your reasoning.
(a) Falling barometric pressure precedes the onset of bad weather.
(b) All life on earth has evolved from a common, primitive organism through the process of natural selection.
(c) My truck’s gas mileage has dropped significantly, probably because it’s due for a tune-up.
(a). law (states a consistently observed phenomenon, can be used for prediction); (b). theory (a widely accepted explanation of the behavior of matter); (c). hypothesis (a tentative explanation, can be investigated by experimentation)
What is law, hypothesis and theory ?A law is defined as the verified statement that will always be true for the specified conditions.A hypothesis is defined as the generalized statement that is not based upon any verification or test. Basically, a hypothesis is a guess that we have to verify through test or experimentation.A theory is defined as an in-depth information about a verified fact or observed phenomenon.Learn more about law here ;
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PLEASE HELP ME :( It’s urgent!!!!!
Answer:
C and D
Explanation:
In the first table, both element particles have more electrons than protons which is unusual and indicates they have a negative charge. Furthermore both numbers add up to full electron shells (2,8 and 2,8,8) meaning they are ions (charged particles formed to gain full valence shells and become stable), so it is C for the first question, negative ions.
As for the second one, isotopes like versions of the same element except with different numbers of neutrons, so they are still the same element but have different mass. As shown here the numbers indicate the number of neutrons therefore it is D, 3 more neutrons and no more electrons.
Hope this helped!
what are electrode potential
Answer:
Electrode potential is the electromotive force to the galvanic cell built standard.
Explanation:
Electrode potential is the convention electrode is the standard hydrogen electrode to the value zero potential.
Electrode potential is the origin to the developed in that interface between the electrode and electrolyte.Electrode potential is the interface due to the transfer of across the specific of molecules to the electrode potential.Electrode potential that working potential non zero reaction net current the working electrode potential.Electrode potential is that performed extrapolation of that measured to that values set that standard.Electrode potential under the depends on the nature of that contacting electrode reactions to the interface.Electrode with hydrogen is that ideal solution is zero potential to the all temperature to standard formation.Electrode potential to the working electrode, counter electrode and reference electrode that using three setup electrode.Electrode potential are performed the positive of that connected to that working electrode terminal to reference electrode.Answer:
In electrochemistry, electrode potential is the electromotive force of a galvanic cell built from a standard reference electrode and another electrode to be characterized.
what is this can any body answer
An acetaminophen suspension for infants contains 80 mg/0.80 mL suspension. The recommended dose is 15 mg/ kg body weight. How many mL of th is suspension should be given to an in fant weighing 14 lb? (Assume two significant figures.)
Answer:
the answer is 35mg and 58ml
What products are formed when a hydrocarbon combusts?
A. Hydrogen and oxygen
B. Carbon dioxide and water
C. Carbon dioxide and hydrogen
D. Water and hydrogen
Answer:
b
Explanation:
The products are formed when a hydrocarbon combusts are carbon dioxide and water and the correct option is option B.
Combustion is a chemical reaction that occurs when a fuel combines with an oxidizing agent, typically oxygen, resulting in the release of heat and the formation of products. It is an exothermic reaction, meaning it releases energy in the form of heat and light.
During combustion, the fuel undergoes rapid oxidation, breaking its chemical bonds and forming new bonds with oxygen. Common examples of combustion include burning of wood, gasoline, natural gas, and other hydrocarbon fuels.
The reaction is often accompanied by the production of flames and the release of carbon dioxide and water vapor.
Thus, the ideal selection is option B.
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The weight of a cup with water is 2.58 kg the weight of the empty cup is 1.5 kg considering significant figures what is weight of the water
Answer:
The correct answer is 1.1 kg
Explanation:
From the data provided:
Weight (cup + water)= 2.58 kg
Weght (cup) = 1.50 kg
Thus, we simply calculate the difference between the full cup and the empty cup to obtain the net weight of water:
Weight (water) = Weight (cup + water) - Weght (cup)
= 2.58 kg - 1.50 kg
= 1.08 kg ≅ 1.1 kg
Answer: chemistry f sucks
Explanation:
bc it's f stupid
Can skmebodynheop me with this it’s science.
Answer:
v=50km/hr
Explanation:
Given:
s= 300km
t= 6 hours
Required:
v=?
Formula:
v=s/t
Solution:
v=s/t
v=300km/6h
v=50km/hr
Hope this helps ;) ❤❤❤
Uun element full name
Answer: Darmstadtium
Hope that helped
Answer:
Ununnilium
Explanation:
Uun on the table of elements is Ununnilium.
explain why the following statement is false: “if a theory is accepted for a long time, it eventually becomes a law.” include specific details about both theories and laws in your explanation.
Explanation:
hope this will help you
HELP! Ethanol has a density of 0.8 g/cm3. a. What is the mass of 225 cm3 of ethanol? b. What is the volume of 75.0 g of ethanol?
Answer:
The correct answers are:
a) 180 g
b) 93.7 cm³
Explanation:
The density of a substance is the mass of the substance per unit of volume. So, it is calculated as follows:
density= mass/volume
From the data provided in the problem:
density = 0.8 g/cm³
a) Given: volume= 225 cm³
mass= density x volume = 0.8 g/cm³ x 225 cm³ = 180 g
b) Given: mass= 75.0 g
volume = mass/density = 75.0 g/(0.8 g/cm³)= 93.75 cm³≅ 93.7 cm³
Taking into account the definition of density:
the mass of 225 cm³ of ethanol is 180 g.the volume of 75.0 g of ethanol is 93.75 cm³.Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume} [/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Mass of 225 cm³ of ethanolIn this case, you know that:
Density= 0.8 [tex]\frac{g}{cm^{3} } [/tex]Volume= 225 cm³Replacing in the definition of density:
[tex]0.8 \frac{g}{cm^{3} } =\frac{mass}{225 cm^{3} } [/tex]
Solving:
mass= 0.8 [tex]\frac{g}{cm^{3} } [/tex] ×225 cm³
mass= 180 g
In summary, the mass of 225 cm³ of ethanol is 180 g.
Volume of 75.0 g of ethanolIn this case, you know that:
Density= 0.8 [tex]\frac{g}{cm^{3} } [/tex]mass= 75 gReplacing in the definition of density:
[tex]0.8 \frac{g}{cm^{3} } =\frac{75 g}{volume} [/tex]
Solving:
0.8 [tex]\frac{g}{cm^{3} } [/tex] ×volume= 75 g
volume= 75 g÷ 0.8 [tex]\frac{g}{cm^{3} } [/tex]
volume= 93.75 cm³
Finally, the volume of 75.0 g of ethanol is 93.75 cm³.
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A standard gold bar has a mass of 12.4 kg. When the gold bar is placed into a container of water the volume changes by 642 mL. What is the density of gold in g/mL
Answer:
19.3 g/mL
Explanation:
The following data were obtained from the question:
Mass (m) = 12.4 kg
Volume (V) = 642 mL.
Density (D) =.?
Next, we shall convert 12.4 kg to grams. This can be obtained as follow:
1 kg = 1000 g
Therefore,
12.4 kg = 12.4 × 1000
12.4 kg = 12400 g
Therefore, 12.4 kg is equivalent to 12400 g.
Finally, we shall determine the density of the gold as follow:
Density is simply defined as the mass of the substance per unit volume of the substance. It can be represented mathematically as:
Density (D) = mass (m) / volume (V)
D = m/V
With the above formula, the density of gold can easily be obtained as follow:
Mass (m) = 12400 g
Volume (V) = 642 mL.
Density (D) =.?
D = m/V
D = 12400/642
D = 19.3 g/mL
Therefore, the density of hold is 19.3 g/mL
Jim went for a 3.75 hour run. How many minutes did he run?
Which set of atoms are isotopes?
A. 16^ 8X and 16^ 6X
B. 16^ 8X and 17^ 8X
C. 12^ 6X and 14^ 7X
D. 6^ 26X and 26^ 6X
Answer:
Option B.
Explanation:
Isotopy is a phenomenon where by two or more atoms have the same atomic number (proton) but different mass number due to the difference in neutron present in the atoms. The atoms that exhibit Isotopy are isotopes.
With the above information, we can obtain the right answer to the question given above as follow:
For option A:
Isotope >> atomic no >> Mass no
16 8X >>> 8 >>>>>>>>> 16
16 6X >>> 6 >>>>>>>>> 16
Since they have the different atomic number, they are not isotope.
For option B:
Isotope >> atomic no >> Mass no
16 8X >>> 8 >>>>>>>>> 16
17 8X >>> 8 >>>>>>>>> 17
Since they have the same atomic number but different mass number, they are isotope.
For option C:
Isotope >> atomic no >> Mass no
12 6X >>> 6 >>>>>>>>> 12
14 7X >>> 7 >>>>>>>>> 14
Since they have different atomic number, they are not isotope.
For option D:
Isotope >> atomic no >> Mass no
6 26X >> 26 >>>>>>>>> 6
26 6X >>> 6 >>>>>>>>> 26
Since they have different atomic number, they are not isotope.
From the above illustration, only option B contains isotopes because the atoms have the same atomic number but different mass number
the statue of liberty in new york city is approximately 305 feet tall. How many US dimes would be in a stack of the same height? Each dime us 1.35 mm thick
Answer:
It takes 62863 dimes to equal the height of the Statue of Liberty.
Explanation:
If the Statue of Liberty is 305 ft tall and a coin is 1.35mm thick, how many coins will it take to equal the height of the statue?
Convert 305 ft to mm:
1 ft = 30.48 cm
305 ft = 9296.4 cm
92 964 mm
Now, if a dime is 1.35 mm thick, how many dimes will it take to get to 92 964 mm?
1 dime = 1.35mm
X dimes = 92964 mm
X coins = 92964 / 1.35
X = 62863 dimes
An Olympic swimming pool is 50 meters long. You swim from one end to the other four times.How many meters do you swim?
Answer:
200 meters
Explanation:
if u swim for each end 4 times, and its 50 meters long, 50 x 4 = 200 meters
what would be the best way to take water out of your coffee