Answer:The different substances in a mixture are not chemically combined, whereas the different elements in a compound are. The atoms do not combine in the mixture, but they combine when they form a compound.
Explanation:
Answer:
Explanation:
1. The constituents or components of a mixture and compound can easily be separated.
2. Both mixture and compound can be heterogeneous.
3. Both compound and mixture are combined in a definite ratio or in any proportion.
4. Both compound and mixture consist of two or more substances/elements.
5. Both compounds and mixtures have physical and chemical properties.
Hope it helped you.
Sodium metal is placed in water to produce sodium hydroxide (NaOH)
ions and hydrogen gas (H2).
Which substance in the chemical reaction is a solid?
a Sodium
b Water
C Sodium hydroxide ions
d Hydrogen vapor
Answer:
a Sodium
Explanation:
The solid in this reaction is the sodium metal. A solid is a substance held together by attractive forces that are very strong.
Solids have a fixed shape and volume.
Metals are solidsSodium is an alkali metal belonging to the first group on the periodic table. This solid combines with the liquid water. The product is an aqueous sodium hydroxide.3. Which subatomic particles account for most of an atom's mass?
4. Which subatomic particle accounts for most of an atom's volume?
3. Proton is the subatomic particle which accounts for most of an atom's mass.
4. Electrons are the subatomic particle which accounts for most of atoms volume.
PLEASE HELP! DUE IN 5 MINS!!
CHEMISTRY
True or false: lone pairs of electrons around the central atom do not influence the shape
of the molecule.
Answer:
False
Explanation:
Plz help ASAP question is on picture
Answer:
The arrow going directly from the sun to the earth (middle one)!
Explanation:
HOPE THIS HELPS! :)
Please help!! What is this
Answer: It's a redox reaction
Explanation:
What is the vapor pressure of ethanoic acid at 105°C?
What volume of the 5.00% (w/v) citrie acid solution described above would be needed to provide 738 mg citric acid for a reaction?
738 mg of eitrie acid for a reaction Show your work using dimensional analysis and report yo
answer with the correct number of significant figures, (You should know the relationship betw
grams and milligrams.)
Answer:
[tex]V=14.76mL[/tex]
Explanation:
Hello!
In this case, since the given 5.00 % (w/v) can also be represented in terms of mass of solute over volume of solution, we need to make sure that the same system of units is used, in this case, the appropriate units for that unit of concentration should be g/mL, and therefore, we first need the mass of citric acid in grams:
[tex]m=738mg*\frac{1g}{1000mg} =0.738 g[/tex]
Thus, by using the w/v percent, we obtain the following volume of solution:
[tex]V=\frac{m}{m/w}*100\%[/tex]
So we plug in to obtain:
[tex]V = \frac{0.738g}{5.00\%}*100\% \\\\V=14.76mL[/tex]
Best regards!
Given 2Na + 2H2O → 2NaOH + H2, how many grams of oxygen are produced if 300.00 grams of Na are reacted with water?
First you have to find the number of moles , then you have to apply stoichometry to find the number of moles of H2 gas , after that you can determine its mass.
What is the average speed of the toy car during the two trials?
Answer:
2.3?
Explanation:
What is a mole in chemistry terms?
a mammal found in Eurasia and North America
an IS unit for measuring the amount of a substance
a benign tumor sometimes found on human skin appearing as a small, sometimes raised area of skin, usually with darker pigment
a Mexican sauce made from chili peppers, other spices and chocolate
Answer:
the IS unit for measuring the amount of a substance
Explanation:
that's what it is
6. What is the lowest temperature on the Kelvin scale? What happens to matter when it
reaches this temperature?
Answer:
-273.15 degrees celsius
The element carbon continuously Cycles through an ecosystem. A simplified carbon cycle showing Step I, where organic molecules (carbohydrates) are created, and step II where CO2, Carbon dioxide, is produced, is depicted below.Identify the process in Step I and explain how it causes the movement of carbon.
Answer:
See the answer below
Explanation:
Organic molecules in the form of carbohydrates are created during photosynthesis or chemosynthesis and these processes cause carbon to be removed from the atmosphere or other environment into the biosphere - the living organisms of the ecosystem.
During photosynthesis, atmospheric carbon dioxide is fixed as carbohydrates into green plants in a two-stage process that requires sunlight energy and water. The entire process can be summarized as an equation below:
[tex]6CO_2 + 6H_2O + sunlight --> C_6H_1_2O_6 + 6O_2[/tex]
Instead of using water as a reactant, chemosynthetic organisms make use of high energy chemicals such as hydrogen sulfide to fix carbon dioxide in order to generate carbohydrates.
[tex]CO_2 + 4H_2S + O_2 -> CH_20 + 4S + 3H_2O[/tex]
Both processes ensure that carbon dioxide moves from the environment into living organisms.
Which of these is a physical property?
Group of answer choices
ability to burn
weight
ability to tarnish
ability to rust
When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water
When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water
according to the reaction below.
2H2+ O2 + 2H2O
How many grams of oxygen were required?
2H, + O2 + 2H2O
How many grams of oxygen were required?
Mass of Oxygen required : 24 grams
Further explanationGiven
3 moles of H
1.5 moles of O
3 moles of H₂O
Required
Mass of O
Solution
Reaction
2H₂ + O₂ ⇒ 2H₂O
Mass of Oxygen for 1.5 moles of O :
= mol x Ar O
= 1.5 moles x 16 g/mol
= 24 grams
Which conclusion was a direct result of the gold foil experiment?
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, each atom in the foil was composed mostly of empty space because most alpha particles directed at the foil.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
Each atom in the foil was composed mostly of empty space because most alpha particles directed at the foil. This conclusion was the direct result of the gold foil experiment.
To know more about atom, here:
https://brainly.com/question/13518322
#SPJ2
The mass of an unidentified rock is 15.5 grams. Students determine the volume of the rock by placing the rock in a cylinder with water. What was the density of the rock that the students should have calculated?
Hint: The graduated cylinder measures volume. Read the difference in water level.
Please help me understand how to...
Calculate the mass of Cr2O3 that can be produced if the reaction of 56.2 g of chromium and sufficient oxygen has a 76.0 % yield.
...Thank you!
Answer:
[tex]m_{Cr_2O_3}^{actual}=62.4gCr_2O_3[/tex]
Explanation:
Hello!
In this case, according to the reaction:
[tex]4Cr+3O_2\rightarrow 2Cr_2O_3[/tex]
We can see there is a 4:2 mole ratio between chromium and chromium (III) oxide, this, for the given 56.2 g of chromium, the theoretical yield of the oxide product is computed down below:
[tex]m_{Cr_2O_3}^{theoretical}=56.2gCr*\frac{1molCr}{52.0gCr}*\frac{2molCr_2O_3}{4molCr} *\frac{151.99gCr_2O_3}{1molCr_2O_3} =82.13gCr_2O_3[/tex]
Now, considering the 76.0-% yield for this reaction, the actual yield turns out:
[tex]m_{Cr_2O_3}^{actual}=82.13gCr_2O_3*\frac{76.0gCr_2O_3}{100gCr_2O_3} \\\\m_{Cr_2O_3}^{actual}=62.4gCr_2O_3[/tex]
Best regards!
1. Compound description ionic or molecular? 1 Compound 1 is a hard white smooth odorless solid, which is insoluble in water. If the flame from an ordinary laboratory burner is held on the solid for 10 minutes, the solid grows hot to the touch but does not soften. ionic molecular (can't decide)
2 Compound 2 is a hard light gray solid made up of clusters of cube-shaped crystals. It can easily be ground into a fine powder. If that powder is compressed to form a block, the block is an insulator. However, if the block is moistened slightly, it starts to conduct electricity much better. ionic molecular (can't decide)
3 Compound 3 is a clear liquid with a strong pleasantly fruity smell. If cooled it freezes at about −10°C. In the solid state it does not conduct electricity. ionic molecular (can't decide)
Answer:
Compound 1 - Can't decide
Compound 2 - Can't decide
Compound 3 - molecular
Explanation:
The solid that has been designated as compound 1 is difficult to really classify because, we can see that the solid only became hot when heated but does not soften. This can be an attribute of an ionic solid. However, the same solid is not soluble in water. This insolubility in water is a property of molecular solids. As a result of these, we will find it difficult to classify the solid.
Compound 2 is also difficult to decide upon because ionic solids are crystalline and can not be ground into powder. Amorphous substances can be ground into powder easily. Then, we can see that the substance does not conduct electricity in block form but does so when moistened. This means that we can not conveniently classify it as a molecular solid since molecular substances do not conduct electricity.
A molecular substance usually has a low melting and freezing point and also does not conduct electricity hence compound 3 is molecular solid.
For most of a cells life, chromosomes exist in a loose noodle like structure. Why do they become more compact?
Answer: For most of the life the chromosomes exists in a loose noodle like structure. They become compact to fit into a very small space.
Explanation: The chromosomes consists of a very long DNA that is linear. The liner DNA also has many proteins associated with it which is called as histone proteins.
These proteins fold and gets packed into a compact form from loose noodle or thread like structure.
This is necessary to get into a compact structure because being in linear form would require much space which is not possible. So as to manage the space and many processes like replication, repair and gene expression it is necessary for the chromosomes to get compact.
A chemistry student is performing a lab exercise where they are reacting aqueous Lead (II) Nitrate with aqueous Potassium Iodide. The student begins the reaction with 10.0 g of Lead (II) Nitrate and 12.0 g of Potassium Iodide. At the end of the experiment the student has collected 11.4 grams of the bright yellow solid precipitate Lead (II) Iodide.
Write the full balanced equation. Include the appropriate states of matter.
How many atoms of Lead are found in the product collected by the student?
Based upon the information above, what is the percent yield of this student’s lab?
Answer: Pb(NO3)2(aq) + 2KI(aq) —> PbI2(s) + 2KNO3(aq)
1.57x10^22 atoms of Pb
87% yield
Explanation:
10.0 g Pb(II) nitrate = 10/333 moles = 0.03 moles
12.0 g KI = 12/166 moles = 0.072 moles (0.06 moles required)
11.4 g PbI2 = 11.4/421 moles = 0.026 moles
expected yield 0.03 moles, yield = 87%
atoms in 11.4 g = 0.026 moles = 0.026*6.02214076*10^23 atoms = 1.57*10^22
Calculate the pH of a buffer solution containing 0.1 M of ethanoic acid (CH3COOH) and 0.02 M Magnesium ethanoate (NB make sure you have the correct formula for the salt and therefore CH3COO-ions ). The Ka for ethanoic acid is 1.74 x 10-5 mol dm-3.
Answer:
By the end of this module, you will be able to: ... (a) Calculate the pH of an acetate buffer that is a mixture with 0.10 M acetic acid and 0.10 M ...
What kind of intermolecular forces have the weakest attraction?
Answer:
This kind of interaction can be expected between any polar molecule and non-polar/symmetrical molecule. The induction-interaction force is far weaker than dipole–dipole interaction, but stronger than the London dispersion force.
Hope this is fine for you. Report the correct number of
significant figures.
a. 87.3 + 0.001 =
b. 0.201 + 0.92 =
c. 320 + 8.41 =
d. 1200 – 60 =
Answer:
[tex]87.3 + 0.001 = 87.301[/tex]
[tex]0.201 + 0.92 =1.121[/tex]
[tex]320 + 8.41 =328.41[/tex]
[tex]1200-60=1140[/tex]
Explanation:
Solving (a): 87.3 + 0.001 =
87.3 --> 3 significant figures
0.001 --> 1 significant figure
So, the answer must be in at least 3 significant figures
[tex]87.3 + 0.001 = 87.301[/tex]
Solving (b): 0.201 + 0.92 =
0.201 --> 3 significant figures
0.92 --> 2 significant figures
So, the answer must be in at least 3 significant figures
[tex]0.201 + 0.92 =1.121[/tex]
Solving (c): 320 + 8.41 =
320 --> 2 significant figures
8.41 --> 3 significant figures
So, the answer must be in at least 3 significant figures
[tex]320 + 8.41 =328.41[/tex]
Solving (d): 1200 – 60 =
1200 --> 2 significant figures
60 --> 1 significant figure
So, the answer must be in at least 2 significant figures
[tex]1200-60=1140[/tex]
How much voltage is needed to get 3 amps to flow through a resistance of 6ohms
Answer:
18 Volt
Explanation:
Step 1: Given data
Intensity of the current (I): 3 AmpereResistance (R): 6 OhmRequired voltage (V): ?Step 2: Calculate the required voltage
We have a continous current flowing through a resistance. We can calculate the required voltage using Ohm's law.
I = V/R
V = I × R
V = 3 A × 6 Ω = 18 V
Why do electrons repel each other?
Answer:
Electrons repel each other due to electrostatic force of attraction between both of them as a result prevent the electron from entering the nucleus preventing it from collapsing
Electrons repel each other because they have the same charge present in
them.
What is Law of Magnetism?Law of magnetism states that:
Like poles repelUnlike poles attract.Electrons are subatomic particles which are negatively charged which
depicts them possessing like poles.
This explains why electrons which are in contact with each other will repel as
a result of the repulsive force present in like poles.
Read more about Law of Magnetism here https://brainly.com/question/12529206
Fat and water in the sausage changed state
Answer:
Susie cooked sausages on a barbecue. (a) Fat and water in the sausages changed state. Draw one line from each statement to the correct change of state.
Explanation:
brailest/ crown please
What is the definition of silicon minerals
Along the length of the DNA strand, information is stored in the sequence of __________.
why is light important in astronomy?
Answer:
When stargazers go outside at night to look at the sky, they see the light from distant stars, planets, and galaxies. Light is crucial to astronomical discovery. Whether it's from stars or other bright objects, light is something astronomers use all the time. Human eyes "see" (technically, they "detect") visible light.
Answer:
Image result for why is light important in astronomy?
When stargazers go outside at night to look at the sky, they see the light from distant stars, planets, and galaxies. Light is crucial to astronomical discovery. Whether it's from stars or other bright objects, light is something astronomers use all the time. Human eyes "see" (technically, they "detect") visible light.
Explanation:
[Ar]4s1 what’s the element name?
Answer:
19
Explanation:
Here,
[Ar] = Argon = atomic no. = 18
4s1 = 1 electron
so 18 + 1 = 19
19 = Potassium (K)
