Answer: When a substance is pure, it is composed of one type of molecule. For example, table salt is only composed of (more or less) salt molecules, while seawater has water and salt molecules. A more complicated example of a non - pure substance is soil. It has many different types of nutrients and compounds.
Answer:
Something that contains only one kind of matter. This can either be one single element or one single compound, but every sample of this substance that you examine must contain exactly the same thing with a fixed, definite set of properties.
How do you express weight?
PLEASE HELP!!!! I NEED TO TURN IT IN TODAY!!
what volume is represented by each small tick mark?
Answer:
hey mines due today did u ever get the answerrr!!
Explanation:
Answer: 25 ML
Explanation:
I had that question and got it right so..
The first periodic table was organized according to atomic mass, but the current periodic table is arranged according to atomic number. What is the difference between atomic mass and atomic number, and why is the atomic number now the basis for the periodic table?
Answer: Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. Atomic number is usually the number of protons present in an element's nucleus. It is the average weight of an element. It is the total number of nucleons in the atom's nucleus.
Assuming there were errors in atomic masses, Mendeleev placed certain elements not in order of increasing atomic mass so that they could fit into the proper groups (similar elements have similar properties) of his periodic table.
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what is the chemical formula of ammonium sulphate
Answer:
(NH∨4)∨2SO∨4
Explanation: The ∨ just means that the number is written small and not big
B
(2)
energy
(3)
A
reaction pathway
2C(s) + H2(g) + 227.4 kJ → C2H2(g)
In the energy diagram, which number represents the potential energy of the products?
Answer:
mgh is the formula for potential energy
The boiling point of isopropyl alcohol is 80.3°C. What state of matter is isopropyl alcohol in at 99°C?
plasma
solid
liquid
gas
Someone please help quick!
Answer:
Liquid
Explanation:
what is the definition of a radical
Answer:
Molecule that contains at least one unpaired electron is called a radical.
Answer:
In chemistry, a radical is an atom, molecule, or ion that has an unpaired valence electron. With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize. Most organic radicals have short lifetimes.
which methods are used for making salts name them and give examples????
Answer:
HAHAH imagine using brainly... just be big brain like me and know all this!!
Explanation:
Answer:
Neutralization method.
Explanation:
NaOH +HCl⇒NaCl+H₂O
answer the following question how will you determine if harmful microorganisms are produced in bread or fruit
Answer:
ur dumb
Explanation:
PLEASE HELP PLEASE ASAP
air pollution would cause trees to die and animals to die . It would coaus most harm by killing everything on land and in the sea beacuse the animals that die might wash away in the ocean killing other animals slowly but surely. and it doesnt help there is soil erosion sooner rather that later it will turn into nothing.
Explanation:
“The mixture is green in color.” This confirms that the mixture is a.... A) suspension B) solution C) colloid D) this proves nothing
10) A student’s calculation w as found to have a 15.6% error, and the actual value w as determined to be 25.7 mL. W hat are the tw o possible values for the student’s experimental measurement?
Answer:
The actual value = 25.7 ml
The error = 15.6%
This means that the value of error = 0.156 * 25.7 = 4.0092 ml
Now, the error percentage found means that the student got the value either greater than the actual one with the value of error or less than the actual one with the value of error.
This means that the two possible readings are:
either : 25.7 + 4.0092 = 29.7092 ml
or : 25.7 - 4.0092 = 21.6908 ml
Explanation:
Imagine you are looking at a bottle of salad dressing containing oil, vinegar, and water. Why are there two layers in the salad dressing? Water and vinegar are both hydrophobic and mix, whereas the oil is hydrophilic. Vinegar and oil are both hydrophobic and mix, whereas the water is hydrophilic. Water and vinegar are both hydrophilic and mix, whereas the oil is hydrophobic. Vinegar dissolves into both the oil and the water in this container.
Answer:
Oil and vinegar separate because it is a suspension
Explanation:
When you let suspensions sit the particles begin to layer out, in the salad dressing the oil layers out on top of the vinegar. The two layers of oil and vinegar don't actually dissolve in each other. The layer with the lower density (oil) floats on top of the layer with a higher density (vinegar)
Water and vinegar are both hydrophilic and mix, whereas the oil is hydrophobic. Oil and vinegar separate because it is a suspension
What is the difference between hydrophilic and hydrophobic molecules ?Hydrophilic molecule are water-loving polar molecule.
They interact with water or they are dissolved in water or water like polar solvent.
For instance, the phospholipid molecules of the plasma membrane has a hydrophilic phosphate group.
Hydrophobic is a water hating substance which can not dissolve in water, but other non-polar solvent.
Thus hydrophobic substances are lipophilic in nature and the hydrophobic solvents are used to separate water-immiscible substances from water.
The layers of oil and vinegar can not dissolve with each other. The oil layer has the lower density floats on top of the layer with a higher density product called vinegar.
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True or False: In every gram of sucrose (table sugar) there is 0.513 g of oxygen
Answer:
True
Explanation:
Step 1: Find molecular formula of sucrose
C₁₂H₂₂O₁₁
Step 2: Convert moles of oxygen present to grams
1 mol O = 16 g O
11 mol O = 176 g O
Step 3: Find molar mass of sucrose
C - 12.01 g/mol
H - 1.01 g/mol
O - 16.00 g/mol
12.01(12) + 22(1.01) + 11(16.00) = 342.34 g/mol C₁₂H₂₂O₁₁
Step 4: Set up dimensional analysis
[tex]1 gC_{12}H_{22}O_{11}(\frac{176 gO}{342.34gC_{12}H_{22}O_{11}} )[/tex]
Step 5: Multiply/Divide and cancel out units
Grams of C₁₂H₂₂O₁₁ and grams of C₁₂H₂₂O₁₁ cancel out.
We are left with grams Oxygen
176/342.34 = 0.514109 grams Oxygen
In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride? The equation for the reaction is below. AgNO3 + NaCl → AgCl + NaNO3
Answer:
The mass in grams of silver chloride, AgCl produced is 84.37 grams
Explanation:
The chemical equation for the reaction is given as follows;
AgNO₃ + NaCl → AgCl + NaNO₃
The mass of silver nitrate, AgNO₃, in the reaction = 100.0 g
Therefore, 1 Mole of AgNO₃ produces 1 mole of AgCl,
The molar mass of silver nitrate, AgNO₃ = 169.87 g/mol
The number of moles of silver nitrate, AgNO₃, in the reaction = 100/169.87 moles
The number of moles of silver nitrate, AgNO₃, in the reaction ≈ 0.59 moles
Since 1 mole of AgNO₃ produces 1 mole of AgCl, 0.59 moles of AgNO₃ produces 0.59 moles of AgCl
The number of moles of silver chloride, AgCl produced = 0.59 moles
The molar mass of silver chloride, AgCl = 143.32 g/mol
Therefore;
The mass of silver chloride, AgCl produced = The number of moles of silver chloride, AgCl produced × The molar mass of silver chloride, AgCl
Which gives;
The mass of silver chloride, AgCl produced = 143.32 g/mol × 0.59 moles = 84.37 g
The mass of silver chloride, AgCl produced = 84.37 g.
The mass of silver chloride produced is 84.37g.
The equation of the reaction is; AgNO3 + NaCl → AgCl + NaNO3
Number of moles of silver nitrate = mass of silver nitrate/Molar mass of silver nitrate
Molar mass of silver nitrate = 170 g/mol
Number of moles of silver nitrate = 100 g/170 g/mol = 0.59 moles
Mass of silver chloride = 0.59 moles × 143 g/mol = 84.37g
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2.3.12mL =
L*
O
a. .312
O b.31.2
O
C..00312
O d..0312
Answer:
0.00312 L
Explanation:
1 liter = 1,000 ml
3.12 ml*(1 liter/1,000ml) = 0.00312 L
C
Which model best illustrates Thomson’s explanation of the atom? Answers in the picture.
pluses and negatives
D) because it has negative and positive signs
Answer:
D. This D one model best illustrates Thomson explanation of atom
Explanation:
Which of the following correctly describes a compound? (4 points)
The atoms are chemically bonded together, and they retain their individual physical and chemical properties.
The atoms are not chemically bonded, and there is no set ratio for how the atoms can combine together.
The atoms can only combine in fixed ratios, and they can only be separated by a chemical change.
The atoms do not retain their individual chemical properties, and they can be separated by physical means.
Explanation:
The atoms are chemically bonded together, and they retain their individual physical and chemical properties.
Answer:
The atoms can only combine in fixed ratios, and they can only be separated by a chemical change.
Explanation:
just took the test the other guys thing was wrong
the chloride of a metal M contains 47.25% of metal 1.0 gram of metal would be displaced from a compound by 0.88 gram of another metal N . find the equivalent weight of M and n.
Answer:
The equivalent weight of M is approximately 31.8 g
The equivalent weight of N is approximately 27.98 g
Explanation:
The given parameters are;
The percentage of the the metal M in in the chloride = 47.25%
Where by the chemical formula for the metal chloride is MClₓ, we have;
47.25% of the mass of MClₓ = Mass of M = W
Therefore, we have;
[tex]\dfrac{0.4725}{W} = \dfrac{1}{W + 35.5 \cdot x}[/tex]
0.4725 × (W + 35.5·x) = W
0.4725·W + 0.4725×35.5×x = W
W - 0.4725·W = 16.77·x
0.5275·W = 16.77·x
W/x = 16.77/0.5275 = 31.799 = The equivalent weight of M
The equivalent weight of M = 31.799 ≈ 31.8 g
Given that 1 gram of M is displaced by 0.88 gram of N, then the equivalent weight of N that will displace 31.799 = 0.88 × 31.799 ≈ 27.98 g
The equivalent weight of N = 27.98 g.
1. What is the mass of 5.05 mL of air if the density of air is 1200.0 g/mL?
Answer:
mass=?,volume=5.05,density=1200.
density=mass/volume.
1200=mass/5.05.
mass=1200×5.05=6060g
Answer:
[tex]\huge \boxed{\mathrm{6060 \ grams}}[/tex]
Explanation:
[tex]\sf \displaystyle density = \frac{mass}{volume}[/tex]
[tex]\sf \displaystyle 1200 = \frac{m}{5.05}[/tex]
Multiplying both sides by 5.05.
[tex]\sf \displaystyle 1200(5.05) = \frac{m}{5.05}(5.05)[/tex]
[tex]\sf 6060=m[/tex]
The mass of the air is 6060 grams.
Question 9 of 10
A team of engineers has decided to design a new shoe for people suffering
from a painful foot condition. What should the engineers do during the
planning stage of their project?
A. Look at the trial's results to see how the design can be improved.
O B. Estimate how much potential consumers would be willing to pay
for this new shoe.
C. Have patients wear the new shoe in an experimental trial to see if
symptoms improve.
D. Build a variety of shoe models.
When inspecting containers, what tool is used to determine weld serviceability and the severity of corrosion?
Answer:
Welder’s hammer
Explanation:
Welders hammer is a type of hammer which has two parts in which one is a flat surface and the other is slightly pointed.
It is used in the removal of different types of splatters which are often associated with welding works.
It is also used as a tool during the inspection containers in order to determine weld serviceability and the severity of corrosion.
please help with the last 2.
Answer: Yttruim: 39 protons, 50 neutrons, 39 electrons
Ruthenium: 44 protons, 57 neutrons, 44 electrons
Displayed formula of 2nonene
3) Two plants are grown using the same light and pots. One plant is given water that has been
microwaved and the other plant is given regular tap water. Their height is measured after 2 weeks.
What are the independent and dependent variables?
Answer:
Independent variable- nature of irrigation water
Dependent variable- height of the plants
Explanation:
In every study, there must be an independent and a dependent variable. The dependent variable changes its value as the value of the independent variable changes.
When the nature of irrigation water is manipulated, the height of the plant changes accordingly. This implies that the nature of irrigation water (microwaved or tap water) is the independent variable while the height of the plant (the response) is the dependent variable.
you add 5.6g of iron to 23.60ml if water and observe that the volume of iron and water together is 24.31 ml. calculate the density
Answer:
8g/mL
Explanation:
Density = Mass/Volume
There is 5.6g of Iron added to the water of 23.60mL and it rose by 0.7mL.
Density = 5.6g/0.7mL of Iron.
A bottle of coke is 250.0 mL. What is the volume in cubic centimeters?
Answer:
The volume in cubic centimeters is 250
Explanation:
The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other), the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:
a ⇒ b
c ⇒ x
So:
[tex]x=\frac{c*b}{a}[/tex]
The direct rule of three is the rule applied in this case where there is a change of units. To perform this conversion of units, you must first know that 1 mL = 1 cubic centimeters. So, if 1 cubic centimeters is 1 mL, how many cubic centimeters equals 250 mL?
[tex]cubic centimeters=\frac{250 mL*1 cubic centimeters }{1 mL}[/tex]
cubic centimeters= 250
The volume in cubic centimeters is 250
Describe the position of each part of an atom in the bohe model
Explanation:
Hey, there!!
The parts are an atom are:
Electrons Protons NeutronsGenerally, Protons and Neutrons lies in the centre of an atom. After that the shells made outer are covered by electrons. We keep 2 electrons in 1st shell, 8 electrons in 2nd, 18 electrons in 3rd shell and so on. The positions of neutron and protons are always in the nucleus and electrons are in the orbits or shell.
Hope it helps....
What are three concepts that you may explore while learning in a physical science course?
6. Using the rules of significant figures, calculate the following:
6.167 +52
5.10
A) 11.4
B) 12
C) 11
D) 63
E) 11.41
Answer:
A. 3
B . 2
C. 2
D. 2
E. 4 significant figures