Answers
Answer: Each element is given its own chemical symbol, like H for hydrogen or O for oxygen. Chemical symbols are usually one or two letters long.
Explanation:Every chemical symbol starts with a capital letter, with the second letter written in lowercase. For example, Mg is the correct symbol for magnesium.
Related Questions
Which of the following observations is evidence used to imply that a chemical reaction has occurred? a. gas evolution b. a precipitate forms c. the color changes d. the temperature changes e. the odor changes f. a sound is produced g. change in taste
Answers
Answer:
burgers
Explanation:
Chemical reaction or chemical change is characterized by gas evolution, precipitate formation and the color changes.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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Which two particles are found in the nucleus of an atom?
Answers
Answer:
Protons and neutrons
Answer:
Protons and Netrons
hope this helps
What is a bone charcoal
Answers
Answer:
Bone char is a porous, black, granular material produced by charring animal bones. Its composition varies depending on how it is made; however, it consists mainly of tricalcium phosphate 57–80%, calcium carbonate 6–10% and carbon 7–10%. It is primarily used for filtration and decolorisation.
5.
If 6.5 g of magnesium ribbon reacts completely
with hydrochloric acid, how many grams of
hydrogen gas would be liberated? Mg , + 2HC1(ag)
→ MgC1 + H, [H = 1.0, Mg = 24.0]
Answers
Answer:
The mass of hydrogen gas liberated is 0.6 g.
Explanation:
Given data:
Mass of Mg = 6.5 g
Mass of hydrogen gas liberated = ?
Solution:
Chemical equation:
Mg + 2HCl → MgCl₂ + H₂
Now we will calculate the number of moles of Mg.
Number of moles = mass / molar mass
Number of moles = 6.5 g/ 24 g/mol
Number of moles = 0.3 mol
Now we will compare the moles of Mg with hydrogen gas.
Mg : H₂
1 : 1
0.3 : 0.3
Mass of H₂:
Mass = number of moles × molar mass
Mass = 0.3 mol × 2 g/mol
Mass = 0.6 g
What is the KE at 1 m?
Answers
Answer:
K.E. = 1/2 m v2
Explanation:
PLS HELP ASAP
salt water is a pure substance
true or false?
Answers
Answer:
false
Explanation:
salt water cannot be classified as a substance because it's composition can vary
575/2000 in ratio please send me photos of this answer
Answers
Answer:
23 : 80
Not sure
No time for pictures
Answer:
[tex]{\huge{\pink{\underline{\underline{SoLuTiOn}}}}}[/tex]
Refer to above attachment...
The density of this material is 2 g/cm^3.There are 24 cm^3.
What is the total mass?
Answers
Answer:
[tex]\boxed {\tt 48 \ grams}[/tex]
Explanation:
Mass can be found by multiplying the density by the volume.
[tex]m=d*v[/tex]
The density is 2 grams per cubic centimeter.
The volume is 24 cubic centimeter.
[tex]d= 2 \ g/cm^3 \\v=24 \ cm^3[/tex]
Substitute the values into the formula.
[tex]m= 2 \ g/cm^3 *24 \ cm^3[/tex]
Multiply. Note that the cubic centimeters, or cm³ will cancel each other out.
[tex]m= 2 \ g * 24[/tex]
[tex]m= 48 \ g[/tex]
The mass of the material is 48 grams.
Can someone help me with this, if so just put the letters down in the order that seems right.
Answers
Which of the following is NOT a type of scientist?
A. Geologist
B. Botanist
C. Meteorologist
D. Cryptologist
Answers
beeans beans beans beans beans!!
Answers
Answer:
points go brrrrrr
Explanation:
Answer:
Beans.
Explanation:
2
1. Biology is the study of
Answers
Answer: biology is the study of life
Source:trust me bro
how many neutrons are present in the isotope of nobelium, No-254?
Answers
How do planetary geologists study rocky planets?
Answers
Answer:
Planetary geologists study rocky planets by comparing them to Earth.
Explanation:
A planetary geologist is someone who studies how other planets form and evolve over time. Planetary geologists work in the field, laboratory, and -indirectly- in outer space through imagery and other data returned by spacecraft.
Please mark me the brainliest!?!
How do you tell which isotope is more abundant?
Answers
Answer: To determine the most abundant isotopic form of an element, compare given isotopes to the weighted average on the periodic table.
lead has a density of 11.4 g/cm^3 . what is the density in kilograms per cubic meter in scientific notation?
Answers
Answer:
d = 11400 kg/m³
Explanation:
The density of lead is 11.4 g/cm³
We need to convert the density in kg/m³ in scientific notation.
We know that,
1 kg = 1000 g
1 cm = (1/100) m = 0.01 m
Density,
[tex]d=11.4\ \dfrac{g}{cm^3}\\\\=11.4\times \dfrac{(\dfrac{1}{1000})\ kg}{(0.01\ m)^3}\\\\=11400\ kg/m^3[/tex]
So, the density of the lead is 11400 kg/m³.
What is the mass of 6.02 × 10²³ hydrogen atoms
Answers
Answer:
1.0 something depending on your periodic table.
Explanation:
You are given atoms. Not molecules. The mass is what you would read from the periodic table. 1.000 in some form is the answer.
In nature, Hydrogen is found as H2 everywhere except in the sun or a star. The molecular mass (not the atomic mass) would be 2.000 something.
Among the composition of DNA,do you one is more important than other? why or why not?
Answers
Answer:
blood sample of each others
What types of epithelial cells would you expect to find in an area of the body where diffusion of nutrients needs to occur?
1) Cuboidal
2) Columnar
3) Squamous
Answers
Answer: C. Squamous
Explanation:
I got it right on my test...lol
The type of epithelial cells that would be found in an area of the body where diffusion of nutrients needs to occur is squamous.
Epithelial cells refer to the cells that are vital in the lining of the surface of the body. Epithelial cells can be found on the blood vessels, skin, and urinary tract.It should be noted that epithelial cells are important as they act as a protective barrier and help in stopping viruses from getting inside the human body.It should be noted that squamous can be found in an area of the body where diffusion of nutrients needs to occur. They're flat cells and they are usually thin and resembles the scale of fishes.In conclusion, squamous can be found on the surface of the skin.
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What is the pH of a solution prepared by dissolving
0.8 g NaOH in water to make 200 mL solution?
Answers
Answer:
pH>7
Explanation:
bases tend to increase the pH of a solution. since water has the pH of 7 and NaOH has pHof 14, the overall pH of solution will increase.
hope it's helpful.
Answer:
[tex]{\huge{\pink{\underline{\underline{Question:}}}}}[/tex]
What is the pH of a solution prepared by dissolving
0.8 g NaOH in water to make 200 mL solution?
[tex]{\huge{\pink{\underline{\underline{Answer:}}}}}[/tex]
pH>7
Bases tend to increase the pH of a solution.Since,water has the pH of 7 and NaOH has pH of 14, the overall pH of solution will increase.
Calculate the number of moles of neon gas in 8.15 atoms of neon gas
Answers
Answer:
13.5 moles Ne
Explanation:
Atoms --> Moles
1. Put the given number over 1
2. Multiply by 6.022x10^23 to get to moles
3. Round by sigfigs
(8.15x10^24 atom Ne(g)/1) (1 atom Ne(g)/6.022x10^23molesNe)=13.5337...
13.5337 --> 13.5 moles Ne
A rock can be broken down into different kinds of substances by physical processes. No chemical reactions are
needed to separate different parts of a rock into pure substances. This is because a rock is a
A. compound
B. element
C. mineral
D. mixture
Answers
Susan made observations about outside events she noticed throughout the day. The day began with rain. Susan saw puddles on the road. The rain stopped and the sun began to shine. The puddles disappeared. Later, clouds began to form in the sky. How do the parts of the water cycle relate to the events that Susan saw?
Answers
Answer:
Rainfall - precipitation
disappeared puddles - evaporation
cloud formation - condensation
Explanation:
Rainfall that is observed by the Susan is the precipitation of the water cycle in which the water vapor that was condensed become heavy and form droplets of water and fall from sky to the earth surface.
Puddles that formed due to rainfall are the collection of water in the water cycle which is evaporated (process: evaporation) into the atmosphere n the form of water vapor which condensed to form clouds.
how atoms differ from others, pls is so urgent
Answers
Answer:
There are more than a hundred different atoms, but each element contains only one kind of atom.
Atoms are what make one element different from another.
So what makes one atom different from another?
The Greeks thought atoms could not be divided into anything smaller but they were wrong! Every atom can be divided into three different components - protons, neutrons and electrons.
The nucleus, or centre of an atom, is made of protons, (which have a positive electrical charge) and neutrons, which are neutral (in other words, they have no charge).
Electrons, which have a negative charge, move around the centre of the atom.
Normally, the number of electrons is equal to the number of protons, which makes atoms electrically neutral.
The number of protons in an atom is the defining feature of an atom. It's what makes one element different from another. The number of protons in an atom is called its atomic number. Oxygen atoms have 8 protons. So the atomic number of oxygen is 8.
All the elements in the universe are arranged according to their atomic number in the periodic table.
Atomic mass
If you add together the number of protons (or atomic number) and the number of neutrons in the nucleus of an atom, you can calculate the mass of the atom. Helium (He), atomic number two, has two protons and two neutrons. So the mass number for Helium is 4.
Isotopes
Atoms with the same number of protons but different numbers of neutrons are called isotopes. Uranium-238 and uranium -235 are two different isotopes of uranium. Uranium- 238 has a mass number of 238. Uranium-235 has a mass number of 235. So uranium-238 has more neutrons than uranium-235. But they are still both atoms of uranium because they have the same number of protons.
Compounds are pure substances. What other substances are considered pure substances?
Answers
Answer:
um... hydrogen gas
gold metal
sugar (sucrose)
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation:
(
)CaSO4 → (
)O2 + (
)CaS
Answers
Answer:
Explanation:
1,2,1
Answer:
here's the answer
Explanation:
Consider the following intermediate chemical equations.
2 equations: upper P subscript 4 (s) plus 3 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 6 (s). Delta H 1 equals negative 1, 640 kilojoules. 2: upper P subscript 4 upper O subscript 10 (s) right arrow upper P subscript 4 (s) plus 5 upper O subscript 2 (g). Delta H 2 equals 2, 940.1 kilojoules.
What is the enthalpy of the overall chemical reaction Upper P subscript 4 upper O subscript 6 (s) plus 2 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).?
-4,580 kJ
-1,300 kJ
1,300 kJ
4,580 kJ
Answers
Answer:
-1300
Explanation:
Answer:
-1300
Explanation:
trust
The accepted density of copper is 8.96 g/mL. Calculate the percent error of a student’s measurement which resulted in a density of 8.86 g/mL.
Answers
Answer:
The answer is 1.12 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual density = 8.96 g/mL
error = 8.96 - 8.86 = 0.1
We have
[tex]p(\%) = \frac{0.1}{8.96} \times 100 \\ = 1.1160714...[/tex]
We have the final answer as
1.12 %Hope this helps you
how to draw Bohr Model of Phosphorus??
Answers
Answer:
look at the image below
Explanation:
The Bohr model of phosphorus depicts 15 electrons in different energy levels, with the nucleus at the center.
Two electrons are present in the first energy level, eight electrons are present in the second and five electrons are present in the third. The electron configuration of phosphorus, which is [tex]1s^2 2s^2 2p^6 3s^2 3p^3[/tex], matches this distribution.
The formula [tex]2n^2[/tex], where n is the energy level number, determines the maximum number of electrons in each energy level. Therefore, the first energy level can accommodate only two electrons, the second energy level up to eight, and the third energy level up to eighteen.
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helllllllppppppp meeeee pweaaseee
Answers
they get closer together