When a substance is in the process of changing phases states of matter what happens to the temperature
Answer:
Temperature stays constant.
Explanation:
During a phase change, the temperature does not change. Temperature will only change when a phase change is completed.
what is a balanced chemical formula
what is it and how do i do it
Which is true about dissolving a polar substance in water?
The solvent particles are all nonpolar molecules.
The solute particles are carried into the solution.
The solute particles have no attraction for the solvent molecules.
The solute particles are very different from the solvent molecules.
Answer: The best answer is "The solute particles are carried into solution."
Explanation: I saw "best" because I don't know how to interpret "carried into solution." Does this refer to some micro-critter putting them into wheelbarrows? But it is better than the other options. Water (the solvent particles) are all polar. The solute (stuff being dissolved) DOES have an attraction for the solvebt (water), since water is also polar. The solute particles are very different: possible, but irrwelevant. As long as they are polar, I don't care what they look like.
None of the statements are true about dissolving a polar substance in water.
What happens when a polar substance is dissolved in water?When a polar substance is dissolved in water, the solute particles get surrounded by the water molecules to form hydration shells because of strong electrostatic interactions between the polar solute and polar water molecules. This process is called solvation or hydration.
The dissolution of a polar substance in water breaks the intermolecular forces within the solute particles that leads to the development of new forces between the solute and solvent particles.
However, the solute particles have attraction for the solvent molecules. Water being a polar solvent dissolves only polar compounds, but not dissolve nonpolar compounds because of lack of strong interactions between nonpolar molecules and water to overcome the cohesive forces among nonpolar molecules.
Therefore, none of the statements are true about dissolving a polar substance in water.
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Calculate the molarity of a solution made by dissolving 4.0 g of calcium bromide, CaBr2, in enough water to give 200 mL of solution.
Answer:
0.1 M
Explanation:
Molarity = number of moles / litres of solution.
4 g of calcium bromide = 0.02 mol
(found by dividing 4 g by the atomic mass of CaBr2, which is 199.886)
200 mL of solution = 0.2 litres
Molarity = 0.02 mol / 0.2 L = 0.1 M
Taking into account the definition of molarity, the molarity of the solution is 0.1 [tex]\frac{moles}{L}[/tex].
In first place, you have to know that molarity is a measure of the concentration of that substance and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{L}[/tex].
In this case you know that 4.0 g of calcium bromide, CaBr₂, dissolves in enough water. Then, the molar mass of calcium bromide being 199.8 g/mole, (that is, the mass of one mole of the compound), the number of moles that 4.0 g of the compound contain is calculated as:
amount of moles=4.0 g × [tex]\frac{1 mole}{199.8g}[/tex]
amount of moles= 0.02 moles
And being the volume 200 mL = 0.2 L (being 1000 mL= 1 L), and replacing the values in the definition of molarity, you obtain:
[tex]Molarity=\frac{0.02 moles}{0.2 L}[/tex]
Solving:
Molarity= 0.1 [tex]\frac{moles}{L}[/tex]
In summary, the molarity of the solution is 0.1 [tex]\frac{moles}{L}[/tex].
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Water molecules tend to be ________ because they are held together by __________ bonds.
cohesive; sulphur
repelant; ionic
adhesive; covalent
cohesive; hydrogen
is a molecule?
А.
a substance made completely of the same type of
atoms that are NOT chemically bonded together
B.
the smallest part of a substance that is still that
substance with atoms chemically bonded together
(1st gets it right wins a burrito)
Answer:
B. the smallest part of a substance that is still that substance with atoms chemically bonded together
Explanation:
Molecules are the small part of a substance with the atoms that are chemically bonded together. Hence, option (B) is the correct answer.
which element is more likely to have a strong chemical reaction, magnesium or chlorine?
Answer:
chemical chlorine will have more reaction
A material that resists changes in shape and volume would be
A. solid
B. liquid
C. gas
D. plasma
Answer:
solids
Explanation:
solids aren't very malleable of prone to change shape and/or volume so...
mearling.
the flow of water
that moves below
the surface
the flow of water
Explanation:
it's actually b)
If a person weighs 125 lbs, 8 oz., how many mg does s/he weigh?
explanation
Answer:
56925842
Explanation:
its right
Why is agar medium used in Petri dishes?
A.It makes bacteria appear larger.
B.It sterilizes the petri dish.
C.It helps microorganisms grow.
D.It makes cells glow.
Answer:
C is the correct answer.
Explanation:
Agar provides a solid growth surface for the bacteria, upon which bacteria reproduce until the distinctive lumps of cells.
The agar medium is used in Petri dishes because it helps microorganisms grow. option C is correct.
What is a microorganism?A microorganism is a microscopic body that cannot be seen with the normal human eyes on anything it can be a virus or bacteria or both. Viruses are disease-causing mostly but there are some good bacteria too.
The use of agar medium is the source of food for the microorganism as all the micronutrients and macronutrients with essential amino acids are present into it.
Therefore, option C is the correct agar medium used in Petri dishes because it helps microorganisms grow.
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Why does organic chemistry have a wide variety from compounds primarily based on only two elements? please help
Organic chemistry have a wide variety from compounds of the presence of two elements namely
CarbonHydrogenThe main variety of compounds exists in the combination of carbon and hydrogen forming hydrocarbons which are the basis of life and present in cells making them virtually everywhere around us.
Organic molecules in itself comprises of multiple chains of carbon atoms with different lengths and because of the ability of carbon to bond with many elements, This produces a variety of compounds which no other atom or element can.
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in 1 to 2 sentences explain why a structural formulas are good for depicting polymers
Answer:
they explain the properties and structure of the compound which empirical molecular formulars cannot explain
The structural formulas are good for depicting polymers because polymers are the chemical compounds attached to the long chain with ac other which is impossible to represent other than the structural formula.
What are structural formulas?The structural formulas are the graphic representation or diagrammatical representation of the structure of any chemical formula in organic and inorganic chemistry they are mostly used.
In Polymers, they are long chains of chemicals compound can be shown diagrammatically or graphically to understand the attachment t of the bonds within them which signifies the physical properties too.
Therefore, polymers are the chemical compounds attached to the long chain with ac other which is impossible to represent other than the structural formula which is why structural formulas are good for depicting polymers.
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Iron can form three different oxides, FeO,Fe2O3 and Fe3O4. A sample of iron oxide was analyzed and was found to contain 69.943% iron with the rest of the mass from oxygen. Determine the empirical formula to determine the identity of the iron oxide
The empirical formula of the iron oxide is [tex]Fe_2O_3[/tex].
And the empirical formula is in an agreement with [tex]Fe_2O_3[/tex] that is iron(III) oxide.
Given:
A sample of iron oxide with 69.943 % of iron and rest with of the mass from oxygen.
To find:
The empirical formula of iron oxide & to identify the type of iron oxide.
Solution:
Consider in 100 grams iron oxide has 69.943 % of iron.
Percentage of oxygen in 100 grams of iron oxide :
= 100% - 69.943%=30.054%
Mass of iron in 100 grams sample =[tex]100g\times \frac{69.943 }{100}=69.943 g[/tex]Mass of oxygen in 100 grams = [tex]100 g\times \frac{30.054}{100}=30.054 g[/tex]Moles of iron = [tex]\frac{69.943 g}{55.845 g/mol}=1.2524mol[/tex]Moles of oxygen = [tex]\frac{30.054 g}{15.999 g/mol}=1.8785 mol[/tex]Let the empirical formula of iron oxide be [tex]Fe_xO_y[/tex]
For empirical formula divide all moles of elements with the least value of moles of an element in the compound:
[tex]x=\frac{1.2524mol}{1.2524mol}=1\\\\y=\frac{1.8785 mol}{1.2524mol}=1.5\\\\Fe_xO_y=Fe_1O_{1.5}\\\\=Fe_{10}O_{15}=Fe_2O_3[/tex]
The empirical formula of the iron oxide is [tex]Fe_2O_3[/tex].
And the empirical formula is in an agreement with [tex]Fe_2O_3[/tex] that is iron(III) oxide.
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What type of volume is solid
Answer:
Fixed Volume
Explanation:
Solids have a fixed shape and occupy a fixed volume.Because the particles in liquids are very close together barely further apart than in solids, liquids do not easily compress, so their volume is fixed. Gases can also flow, so occupy the shape of their whole container. They do not have a fixed shape.
A teacher is instructing students about the states of matter. He wants to compare the
numbers of elements that exist as solids, gases, and liquids at room temperature.
Which kind of illustration should the teacher use to present this information?
The teacher can present this information using a bar chart.
In science, charts are commonly used to present information where comparison is necessary.
Bar charts are especially useful when we intend to show large changes.
In the periodic table, elements exists in various states of matter;
SolidLiquidGasSometimes, as a teacher, you may need to compare the number of elements that exist as solids, gases, and liquids at room temperature.
This comparison is easily brought out using a bar chart since the changes involve large numbers.
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El agua de lluvia tiene un pH de 4,00. Calcule su concentración de ion hidrógeno en mol/litro. Explique por qué el agua es ácida en lugar de neutra.
When adding or subtracting deelmals, how many digits should the answer contain?
Answer:
Depends, but in most cases, 2.
It's best to use as many digits as possible to keep it accurate.
Explanation:
This varies between teachers, as most schools go with 2 decimal places.
This is something that depends in your situation.
You technically want as many decimals as possible to keep it as accurate, but most people stick with 2.
I personally do 3, and commonly do 5 sometimes.
How would you prepare 2.00 L of .100 M K2CrO4
When we are adding water (or solvent) to a solution to decrease its concentration, we are diluting the solution. When dealing with dilution we will use the following equation:
M1 V1 = M2V2
M1 = initial concentration
V1 = initial volume
M2 = final concentration
V2 = final volume
Calculate the volume of the 1.75 M K2CrO4 stock solution needed
M1 = 0.100 M
V1 = 2.00 L
M2 = 1.75 M
V2 = ?
Remember the equation that I said
M1 V1 = M2 V2
[tex]\frac{M1 V1}{M2} = \frac{M2 V2}{M2}[/tex]
V2 = [tex]\frac{M1 V1}{M2}[/tex]
V2 = 0.100*2/1.75
0.114 L
We would prepare 2.00 L of 0.100 M K2CrO4 from 1.75 M K2CrO4 stock solution by diluting 0.114 L of stock solution to the desired volume of 2.00 L
Good Luck!
The boiling point of ethanol is 78.40 c. A student conducts an experiment and finds a boiling point at 75.70 c. What was the percent error? (Please show work I have no idea how to do this cause we haven't learned it yet)
Answer:
[tex]\% \: error = | \frac{origina - expirimental}{original} | \times 100 \\ | \frac{78.40 - 75.70}{78.40} | \times 100 \\ = \frac{2.7}{78.4} \times 100 \\ =3.44 \\ thank \: you[/tex]
How many cg in 173g???
Which of the models shown below best represents the modern understanding of the structure of the atom?
Model B
Model A
Model A
Model C
Photos by Phood and Furman
Model B
ОО
Model C
Answer:
The answer may be A because that's what I believe
The beaker and the graduated cylinder are both holding liquids. The beaker has lemonade and the cylinder has grapefruit juice. What statement best compares the two liquids?
a tall narrow cylinder and a short wide beaker with one hundred milliliters of yellow liquid in them
A. The mass of the liquid does not change if the volume of the liquid changes.
B. The volumes of the two liquids are exactly the same.
C. The volume of the liquid in the beaker is greater because it is short and round.
D. The volume of the liquid in the graduated cylinder is greater because it is taller and narrower.
Answer:
B
Explanation:
Same amount of liquid and take up same amount of liquid but they are in different containers
Please help me!! Really important
Answer:
Lanthanum and Lutetium
I hope this will help you
Click on the image that most accurately represents a pure
compound.
Corre
Incor
What process must occur to cause sediment to stick together when forming sedimentary rock?
cooling
cementation
Compaction
weathering
Answer:
Compaction and Cementation
Dissolved minerals in the ground water precipitate (crystallize) from water in the pore spaces forming mineral crusts on the sedimentary grains, gradually cementing the sediments, thus forming a rock
What is the scientific notification of 266
Which statement accurately describes test tubes and beakers?
A.Beakers and test tubes both have rounded bottoms.
B.Test tubes are better for transferring liquids than beakers.
C.Beakers have liquid volume (mL) markings on the side of them; test tubes are unmarked.
D.Beakers can be held over a flame; test tubes cannot.
Beakers are flat bottom laboratory glassware that can be used to hold liquid in the laboratory. A test tube is a laboratory glassware that is unmarked and can be used to heat a liquid over a flame.
The correct answer is option C: Beakers have liquid volume (mL) markings on the side of them; test tubes are unmarked.
Several glassware are very useful in the laboratory especially when dealing with liquids.
Two among these important glassware are beakers and test tubes. A beaker is mostly used to hold liquids while a test tube is used to both hold and heat liquids if need be during a laboratory experiment.
Beakers are graduated by the side while test tubes are unmarked.
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Results when a few drops of acidified aqueous potassium manganate are added to potassium iodide
sorry for points ....
hope I helped
How many elements are in “H2”
