Answer:
liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation. This method works because the liquids in the mixture have different boiling points. When the mixture is heated, one liquid evaporates before the other.
Explanation:
hope this helps :3
A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have?
Answer:
I think the answer could be 13 i hope this helps
A sample of water has a volume of 24.0 milliliters and a density of 0.992 g/mL. What is its mass? 1) 23.8 g 2) 24.2 g 3) NONE
Answer:
23.8
Explanation:
The formula for density is D=M/V, where D stands for density, M stands for mass, and V stands for volume. In this case, we are solving for mass, so we have to cross multiply the equation to isolate the variable of M. Once we cross multiply, we get the equation M=DV, and then we start to substitute the values into the equation. M=(.992g/mL)(24.0mL) is the equation, and once we multiply, we get 23.808 as the answer. But when figuring out density, mass, or volume, we need to utilize sig figs. Since the two numbers that you are multiplying both have 3 sig figs, the answer must have three sig figs. Round up or down based on the place value that you are rounding to. Since we are trying to get an answer that is in the tenths place, we round down to 23.8, which is the answer.
The more mass you have of a substance:
A. the greater its thermal energy
B. the slower the motion of its particles
C. the smaller its thermal energy
D. the faster the motion of its particles
Which of the following conversion factors would be most useful in converting miles per gallon to kilometers per
liter?
1 gallon/4 quarts
1 liter/1000 ml
O 1 mile/0.62 km
O 1,000 m/1 km
Does sugar when dissolved form ions
Explanation:
Sugar will readily dissolve in water but doesn't form cations and anions in solution. That is, there are no charge carriers formed. Substances that only partially ionize into ions when dissolved in water are called weak electrolytes.
I hope it help:)
Answer:
Dissolving sugar is a physical change. It is not a chemical change. So, ions will not be formed.
What is the density of an object with a mass of 150.0 g and a volume of 20.0 mL
Answer:
7.5g/mL
Explanation:
Density = Mass/Volume
= 150.0g/20.0mL
= 7.5g/mL
What is the density of an unknown object that has a mass of 5.0 g and volume of 20
ml?
Answer:
Density=mass / volume.
Density = 5/20.
0.25g/cm^3.
The density of the unknown object is 0.25 mL
Density of an object is defined as the mass of the object per unit volume of the object. Mathematically, it can be expressed as:
[tex]Density = \frac{mass}{volume} \\ \\ [/tex]
With the above formula, we can obtain the density of the unknown object as follow:Mass = 5 g
Volume = 20 mL
Density =?[tex]Density = \frac{mass}{volume} \\ \\ Density = \frac{5}{20} \\ \\ Density = 0.25 \: ml[/tex]
Therefore the density of the unknown object is 0.25 mL
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A rock is placed in 10-mL of water causing the water level to rise
to 25-mL. The same rock has a mass of 7 grams. What is the density
of the rock?
Answer:
d ≈ 0.47
Explanation:
Density is represented by the ratio of mass to volume. We are given the mass (7 grams), but we need the volume.
The volume can be calculated by subtracting the new volume from the old volume.
25 mL - 10 mL = 15 mL
The volume is 15 mL and the mass is 7 grams. Now, set up the ratio. Remember, d = m/v.
d = 7/15
d ≈ 0.47
Why Aluminium oxide has higher melting point than Alumunium Chloride?
Answer:
They have high melting points . They have ionic
giant lattice structures : strong force of attraction between inland so have high melting points . They are iconic because of large electronegativity differences between the metal and oxygen ....Aluminum oxide (Al203) is ionic but does show some covalent character.
leo is comparing carbon 12 and carbon 14 atoms which particles make these isotopes have different mass numbers
Carbon-12 (or 12C) contains six protons, six neutrons, and six electrons; therefore, it has a mass number of 12 amu (six protons and six neutrons). Carbon-14 (or 14C) contains six protons, eight neutrons, and six electrons; its atomic mass is 14 amu (six protons and eight neutrons).
Hope this helped :)
5. Express the number 1.36 x 104 in common decimal form.
A) 136000
B) 0.0000136
C) 0.000136
D) 13600
E) 1360
Answer: D
Explanation: You move the decimal back 4 times.
i'm reasking this, i need help with this and it's due today. the answer isn't 30,240 minutes, it's the blanks i need filled in :)
Answer:
Explanation:
24hours ×21 days=
you will get the answeer
A young child is sent to the store with exactly $3.00 to buy donuts. If the donuts on a special sale cost $0.95 per dozen, how many donuts can be bought? Assume the baker will sell individual donuts. PLEASE ANSWER AS SOON AS POSSIBLE
Answer..............nvm
Explanation:
3. Express the number 0.0880 in scientific notation.
A) 880 x 10-4
B) 8.80 x 102
C) 8.8 x 10-2
D) 8.80 x 10-2
0.880 x 10-1
Answer:D
Explanation:
Move the decimal forward 2 times.
There is a different Safety Data Sheet for every chemical.
Select one:
O True
o False
Answer:
True
Explanation:
This is true because every chemical reacts differently
A 25.0 mL sample of sulfuric acid is titrated with 30.0 mL of 0.150 M sodium hydroxide. Calculate the concentration of the sulfuric acid.
Answer: The concentration of the sulfuric acid is 0.09 M
Explanation:
Molarity is defined as the number of moles of solute dissolved per liter of the solution.
According to neutralization law,
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1[/tex] = basicity of sulphuric acid [tex](H_2SO_4)[/tex] = 2
[tex]M_1[/tex] = Molarity of sulphuric acid [tex](H_2SO_4)[/tex]solution = ?
[tex]V_1[/tex] = volume of sulphuric acid [tex](H_2SO_4)[/tex]solution = 25.0 ml
[tex]n_2[/tex] = acidity of sodium hydroxide [tex](NaOH)[/tex] = 1
[tex]M_2[/tex] = Molarity of sodium hydroxide [tex](NaOH)[/tex] = 0.150 M
[tex]V_2[/tex] = volume of sodium hydroxide [tex](NaOH)[/tex] = 30.0 ml
[tex]2\times M_1\times 25.0=1\times 0.150\times 30.0[/tex]
[tex]M_1=0.09M[/tex]
Thus the concentration of the sulfuric acid is 0.09 M
When a jar of coffee is opened, people in all parts of the room soon notice the smell.
plain how this happens
Answer:
Explanation:
because in air the particles are moving very fast and jar of coffee has hot particles which kinetic energy is also more so that's why it's particles move faster and gets mixed with air and smell is coming from far away
1. After 3 half-lives, how much of a 400 gram sample of radioactive uranium-238 remains? The half-life of
U-238 is 4.47 years.
Answer:
In the blue area, people live closely because of its 1.Indutrialised area 2. The land is costly. 3.urbanisation In lighter color areas its farther because 1.Village 2.Farming area 3.Less popular rural area
Explanation:
In the blue area, people live closely because of its 1.Indutrialised area 2. The land is costly. 3.urbanisation In lighter color areas its farther because 1.Village 2.Farming area 3.Less popular rural area ΔΔΔΔΔβαααααααααααααααααααωωωωωωωωωωωω㏒㏒㏒
After one half life, the sample gets reduced to its half of the initial amount. The 400 g will reduces to 200 g after one half life. Thus, after three half life, it will reduces to 50 g.
What is half life?Half life of a radioactive sample is the time taken to decay its half amount. The radioactive isotopes undergo decay by the emission of charged particles. The radioactive decay is a first order reaction.
Uranium is a radioactive element which undergo alpha decay to form stable nuclei with the release of tremendous energy. Given that the half life of U-238 is 4.47 years.
Afterone half life 400 g of U-238 reduces to its half that is 200 g. For the second half life, 200 reduces to 100 g and for the next half life that is after three half lives it reduces to 50g.
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How many km are equal to 1.55 x 10^4 m?
Answer:
15.5 km
Explanation:
1.55x10^4m
1.55x10000m
15500m
1km=1000m
b=15500m
1km*15500m=b*1000m
1km*15500m/1000m=b*1000m/1000m
b=15.5km
Hope this helps ;) ❤❤❤
1. What is the state of matter of each of these materials at room temperature? a) gold b) gasoline c) oxygen d) olive oil e) mercury (found in thermometers) f) aluminum
Answer:
a) gold - Solid
b) gasoline - liquid
c) oxygen - gaseous
d) olive oil - liquid
e) mercury (found in thermometers) - liquid
f) aluminum - solid
Explanation:
Matter exists in three states viz: solid, gas and liquid. Note that, room temperature is a neither hot or cold temperature, which is about 20-23°C.
A) Gold is a transition metal with the symbol Au. At a room temperature, Gold, like most metals are found as SOLIDS.
B) Gasoline is a liquid mixture of refined hydrocarbons majorly used as fuels.
C) Oxygen is a chemical element with symbol O. It is a constituent of natural air, which is a mixture of different gases including oxygen. Hence, at room temperature, Oxygen is a gas.
D) Olive oil is a vegetable oil got from olives. It is composed of fats and it's a liquid at room temperature.
E) Mercury is an element with symbol Hg. It is the only metallic element found naturally (at room temperature) as a liquid. It is used in thermometers.
F) Aluminum is another chemical element with symbol Al. It is a lustrous metal that occurs as a Solid in room temperature.
How many significant figures are in the answer when you multiply 67.20 x 8.02?
How many significant figures are in the answer when you divide 486.02 by 0.056?
How many significant figures are in the answer when you add 11.264 + 245.3?
Answer: 6, 7 and 6 significant figures, respectively.
Explanation:
A. 67.20 x 8.02 = 538.944, has 6 significant figures .
B. 486.02 x 0.056 = 27.21712, has 7 significant figures .
C. 11.264 + 245.3 = 256.564 = 6 significant figures.
Which of the following is an example of how chemicals can both hurt and
help the environment?
A. Chemicals in a volcano's lava can harm plants, and some
chemicals can be used to determine what is in lava.
B. Chemicals are used to protect skin from the sun and also to help
skin tan.
C. Chemicals can pollute water, but they can also be used to clean
water.
D. Chemicals are used in artists' paints and also are used to clean
artists' paintbrushes.
Answer: C
Explanation: Because I just did the test lol.
Chemicals are substances that can be natural or man-made. It can both hurt and help the environment as they pollute water and can also clean water. Thus, option C is correct.
What are the effects of chemicals?Chemicals are compounds that are synthesized artificially and have various uses and applications in various fields. They can be both beneficial and detrimental to the environment and the ecosystem.
Chemicals like that from factories, pesticides run-off from agricultural fields, drugs, microorganisms, fertilizers, radioactive substances, etc, cause water pollution by acting as contaminants.
On the contrary, chemicals can be used to clean water pollution. Chloramine and chlorine are the most common chemical disinfectants that cleanse contaminated water to make it useful.
Therefore, option C. chemicals can both clean and pollute water.
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Question 1 2.3 kJ is how many J?
Answer:
2300J
Explanation:
1 kilojoule is 1000joules so to get how much is 2.3 multiply it with 1000
What is the relationship between heat and the state of matter of a substance? use the graph to answer the question
Answer:
How can gas become a liquard
Explanation:
air filter
Are changes in the state of matter (phase) considered physical or chemical changes? Why?
Answer:
Physical changes
Explanation:
Changes in the state of matter are physical changes.
First, the material is made up of the same components that is was before it changed states.
The physical properties of the material changed, but its chemical composition did not, meaning that is is a physical change.
Answer:
Physical change
Explanation:
Matter can change between phases, so they are reversible physical changes that do not change matter’s chemical composition.
Changes of state are physical changes in matter. They are reversible changes that do not change matter’s chemical makeup or chemical properties. Water, for example, can be a solid (ice), a liquid (drinking water), or a gas (steam). Those are physical changes that don't change the fact that water is always chemically made up of H2O (two hydrogens and one oxygen).
Question 5 of 10
Why do scientists need governmental funding?
O A. Scientists have to pay taxes to the government on the money they
make.
B. The government is controlled by scientists.
O C. Government politicians ask all the important scientific questions.
O D. The cost of doing scientific research can be very high.
Answer:
d
................. ....
what were the limitation of debereiner's law of traid
Aluminum sells for $0.35 per meter. How much does a piece of aluminum 5.12 kilometers long cost?
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: sand, air, tomato juice, iodine crystals.
Explanation:
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Mixtures concept. You can view video lessons to learn Mixtures. Or if you need more Mixtures practice, you can also practice Mixtures practice problems.
What is the difficulty of this problem?
Our tutors rated the difficulty ofClassify each of the following as a pure substance or a mixt...as low difficulty.
How long does this problem take to solve?
Our expert Chemistry tutor, Dasha took 4 minutes and 29 seconds to solve this problem. You can follow their steps in the video explanation above.
What professor is this problem relevant for?
Based on our data, we think this problem is relevant for Professor Gulde's class at UB.
What proof did you see in the experiment that a chemical reaction took place?
Answer:
Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change