Answer:
Can you explain a little bit more?
Explanation:
What gas is produced by the re
baking soda?
a. oxygen
B. petroleum
С. helium
D. Carbon dioxide
Answer:
D. Carbon dioxide
Explanation:
Explanation:
What gas is produced by the re action of
baking soda?
Baking soda Formula: NaHCO₃
Water Forumula: H2O
Carbon Dioxide Formula: CO2
So I'm going to guess the question was baking soda with water
NaHCo3 + H2O = NaCo3 + H3O
Hmm, nope that's not it.
Maybe it meant decomposition
NaHCO3 = Na2CO3 + H2O + CO2
In which case it would be Carbon Dioxide
What state of matter has indefinite volume and is compressible?
a. Gas
B. Liquid
C. Both Liquid and Gas
D. Solid
Need help on #1 thank youu!
Answer:
Oil---> Wood---> Water
Explanation:
Denser things always go on bottom. Since oil is on top is the least dense among those, and then comes wood and then finally water.
A company wants to put a fleet of low Earth satellites in orbit to create a worldwide telephone link. There is less of a time lag in the conversations the closer to the ground the satellites are. What advantage is there to putting them 700 km up, instead of 250 km up in the sky
What is a chemical equation?
A. a substance
B. a shorthand representation of a chemical reaction
C. a shorthand representation of a chemical bond
D. a diatomic molecule
0.5 g of salt is dissolved in 25 g of water. Calculate the percentage amount of salt in the solution.
how many grams of H20 will be produced by 18g H2
Answer:
160.86 g to the nearest hundredth.
Explanation:
H2 + O ---> H2O
2.016 g H2 produces 18.016 g H2O
1g .. .. .. .. .. 18.016 / 2.016 g H2O
18g .. .. .. .. .. . . (18.016 * 18) / 2.016 g H2O.
= 160.86 g.
What is the answer to this I need help please
Answer : The boron-11 isotope is the most abundant.
Explanation :
As we are given that:
Average atomic mass of boron = 10.81 amu
Mass of boron-10 = 10.0129 amu
Mass of boron-11 = 11.0093 amu
As we know that the average atomic mass of an element is always closest to the most abundant isotope.
Out of the two boron isotopes, B-11 is closest in mass to the weighted average. Therefore, it is the most abundant.
Hence, the boron-11 isotope is the most abundant.
The table below shows two conclusions about atoms based on experiments by Rutherford and Thompson. Which of these statements best explains why Rutherford and Thompson visualized the atom differently? Atoms of different elements contain different particles. New experimental processes provide new scientific evidence. A single model of an atom cannot be agreed upon by all scientists. Scientists believe in proposing theories which contradict current theories.
Answer:
Scientists with varied experimental processes and interests perceive things differently.
Explanation:
Scientists believe in proposing theories which contradict current theories. So the correct option is D.
What are the atomic models?
Recently, the structure of atoms has been discovered. Before the ideal model of an atom was found, several others were proposed and abandoned.
Atomic Model of J.J. Thomson
In his hypothesis, Thomson compared the definition of an atom to that of a Christmas pudding.He claimed that atoms are made up of a positively charged sphere with embedded electrons.Additionally, he claimed that because the magnitudes of positive and negative charges are equal, an atom as a whole is electrically neutral.
Atomic Model of Rutherford
Rutherford experimented with α-particle scattering on a gold sheet.He noticed that the majority of the negative ions did not deflect when they travelled through the gold foil.Small angles were experienced by certain α-particles, whereas almost 180° was experienced by others.This experiment led Rutherford to the conclusion that an atom's nucleus, a positively charged spherical centre with a radius of 10-10 metres, contains almost all of the atom's mass (having a radius of 10–15 m).
Therefore the correct option is D.
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What does Boyle's law state about the relationships among temperature, volume,
and pressure?
When the pressure of a gas decreases, the volume and the temperature of the
gas both increase.
As the volume of a gas increases, the temperature and pressure of the gas both
decrease.
Provided temperature remains constant, the volume and pressure of a gas are
inversely related
When the temperature of a gas increases, the volume and pressure of the gas
both decrease.
Answer:
Provided temperature remains constant, the volume and pressure of a gas are inversely related
Explanation:
Robert Boyle discovered that as long as the temperature of a gas remains constant, the relationship between the volume and the pressure of the gas is inverse. Basically, as the volume of a gas increases, its pressure decreases. As the pressure of the gas increases, its volume decreases.
Boyle's law states relationships among temperature, volume, and pressure are the provided temperature remains constant, and the volume and pressure of a gas are inversely related. The correct option is C.
What is Boyle's law?Robert Boyle gave the Boyle's law. It is also called Boyle–Mariotte law, or Mariotte's law. The law states that at a constant temperature, the volume of the gas increases with the increase in pressure. They are inversely proportional to each other.
The formula of Boyle's law is
P₁V₁=P₂V₂
P₁ = first pressure
P₂ = second pressure
V₁ = first volume
V₂ = second volume
This law tells the relationship between volume and pressure and the temperature of the air.
Thus, the correct option is C. Provided temperature remains constant, the volume, and pressure of a gas are inversely related.
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review the types of elements that create ionic bonds as
well as the types of elements that create covalent bonds.
• N2 • CCl4 • SiO2
• AlCl3 • CaCl2 • LiBr
Answer:
N2 Covalent
CCl4 Covalent
SiO2 Covalent
AlCl3 Covalent
CaCl2 Ionic
LiBr Covalent
Explanation:
With covalent bonds, there is a sharing of electron pairs between the atoms.
With ionic bonds, there is complete transfer of valence electrons between atoms. Formed by the interaction of a metal with a non-metal.
Where:
Electrons aren't transferred in covalent bonds.
Protons aren't transferred in covalent bonds
Protons aren't shared in covalent bonds
N3-
C4+
Cl-
Si4+ = Metal
O2- = Non-metal
Al3+ = Metal
Li+ = Metal
Ca2+ = Metal
Br 1-, 1+, 5+ = Halogen
N2 = N3- and N3- Covalent
CCl4 = C4+ and Cl- x4 Covalent
SiO2 = Si4+ and O2- x 2 Metal with non metal Covalent
AlCl3 = Al3+ and Cl- x 3 Covalent Though this one is complex as to why because it seems like it should be ionic
CaCl2 = Ca2+ and Cl- x 2 Metal with non-metal Ionic
LiBr = Li+ and Br- Covalent as neither is a non-metal
Count then plot the total number of atoms in the reactants to total atoms
in the products for the equation 2H2 + O2 + 2H2O
2 Points
Which separation technique involves heating the components of a solution to
their boiling points?
A. Separation by distillation
B. Separation by density
C. Separation by chromatography
D. Separation by melting point
Answer:
D. Separation by melting point
Answer:
SEPARATE BY DESTILATION
Explanation: just did the test
Plz answer quickly with explanations. .....
Answer:
It would be gas b. The gas you are talking about is carbon dioxide and for the reaction to work the gas needs to be bubbled through into the lime water.
Explanation:
The carbon dioxide reacts with lime water which is a solution of calcium hydroxide to form the white precipitate of calcium carbonate CaCO 3.
What is a chemical reaction?
a. a process of bonding substances together
B. a process that leads to have filled valence shells
following the octet rule
C. a process that releases or consumes energy
D. all of the choices
Answer:
D.
Explanation:
this is because in a chemical reaction all 3 of those work.
Answer:
A chemical reaction is defined as per encyclopedia Britannia as a "a process in which one or more substances, are converted to one or more different substances, the products."
So A is correct, B is correct, C is correct.
So that means we choose D as they're all correct.
Which structural formula represents an isomer?
Answer: 4
Explanation: same amt of Hs Cs and Cls
The Option 4 has same number of atoms but arranged differently so it is the isomer of the given compound.
What is an Isomer ?Isomers are compounds that contain exactly the same number of atoms, i.e., they have exactly the same empirical formula, but differ from each other by the way in which the atoms are arranged.
By the definition of Isomer we can understand that we have to look for a compound that has same number of Carbon , Hydrogen and Chlorine atoms as that given .
Number of Carbon atoms = 3
Number of Hydrogen atoms = 6
Number of Chlorine atoms = 2
It can be seen that there are same number of Carbon , Hydrogen and Chlorine atoms in the fourth option , so Option 4 is the correct answer.
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Values for the molar mass of nitrogen, oxygen, and nitrogen dioxide molecules are given in the table below. What mass of nitrogen dioxide molecules is formed when 1 mole of nitrogen reacts with 2 moles of oxygen and forms nitrogen dioxide? Choices: A). 92.02g B). 46.01g C). 23.00g D) 2.00g
Answer:
A). 92.02g
Explanation:
Equation of the reaction;
N2 (g)+ 2O2(g)------> 2NO2(g)
Note that the balanced reaction equation is the first step in solving any problem on stoichiometry. Once the reaction equation is correct, the question can be easily solved.
Reaction of one mole of nitrogen gas with two moles of oxygen gas yields two moles of nitrogen dioxide.
Mass of two moles of nitrogen dioxide= 2[14 + 2(16)] = 2[14+32]= 2[46]= 92 gmol-1
Therefore; Mass of two moles of nitrogen dioxide is 92
An independent country in which people share a common culture is called
an aristocracy.
an ethnic group.
a nation-state.
a polity.
PLease help
What are some lessons from
past epidemics that we can
apply to our current coronavirus pandemic?
Answer:
The 1918 influenza pandemic and 2002-2003 SARS outbreak suggests social distancing measures, communication, and international cooperation are the most effective methods to slow down the coronavirus.
Explanation:
An electron na hydrogen atom moves from level to level 4 The electron then drops from level 4 to level 2. Which statement
bese most likely test
The energy absorbed in the first move equals the energy released in the second move
The energy absorbed in the first move is greater than the energy released in the second move
The energy released in the first move equals the energy absorbed in the second move
The energy released in the first move is greater than the energy absorbed in the second move
Answer:
The energy absorbed in the first move is greater than the energy released in the second move.
Explanation:
The greater the level number the greater the energy.
A movement up a level requires energy so energy id absorbed.
Dropping down a level releases energy.
1. The polymerization of amino acids produces:
organic acids
lipids
proteins
carbohydrates
2. Which group of compounds has a –OH functional group?
aldehydes
esters
carboxyl acids
alcohols
3. Unsaturated compounds _____.
do not readily react
have a high activation energy
require UV light to react
are very reactive
4. Butene would have ____ carbon atoms and a_____ bond.
- 4 - double
- 2 - single
Answer:
1. Proteins
2. Alcohol
3. Unsaturated compounds are very reactive.
4. Butene has 4 carbon atoms and one double bonds attached to it
Explanation:
1. The polymerization of amino acids gives protein.
Polymerization is a process whereby smaller unit molecules of organic compounds combine repeatedly, in a regular fashion to form a larger organic structure or compound.
The smaller units are called monomers while the larger compound formed are called the polymers.
In this case, the smaller units are the amino acids held or linked together by peptide bonds to form a polymer called proteins.
2.
Compounds with functional group of -OH are called alcohols.
Alcohols are also known as alkanols and they belong to a class of organic compounds where -OH functional group is attached to an alkyl group. They have general formula of CₓH₂ₓ₊₁OH where x refers to the number of carbon atom. They're also categorized into primary, secondary and tertiary alcohols based on the type of carbon in the which the functional group (-OH) is attached to.
3.
Unsaturated compounds are very reactive due to the presence of lone pairs of electrons present in them.
4. Butene actually has 4 carbon atoms and several single bonds attached to it.
Butene has a total of 12 bonds and 1π (pi-bond) while several 11σ (sigma bonds) are attached to it.
Question 1 of 23
The diagram below shows two mugs of coffee mug A and mug B). Both mugs have the same temperature, but mug A contains 30 ml, while mug B contains 5
thermal energy in both mugs?
B
30°C
30°C
.ll Lisa ko
30 ml
5 ml
O Mug A has more thermal energy than mug B
O Mug A has less thermal energy than mug B
O Mug A and B have the same thermal energy
Previous Question
Flag for re
Answer:
mug A has more thermal energy
Explanation:
When electrons are filling energy levels, the lowest energy sublevels are
occupied first. This is
A. None of these
B. The Aufbau principle
C. Hund's rule
D. Conservation of energy
Reset Selection
A student is trying to dissolve 20 grams of sugar in a beaker containing 250 milliliters of water at room temperature. What can the student do to make the sugar dissolve faster in the water? a. decrease the temperature of the water b.use larger pieces c.stir rapidly d.use less water
Answer:
C. Stir rapidly
Where does a wolf get energy from?
Where does a rabbit get energy from?
Where does a plant get energy from?
Where does a mushroom get energy from?
Answer:
Check Explanation
Explanation:
In this case the Mushroom would get energy from decomposing dead plants and animals in the soil/ground
The plant would get energy from the sun (simplified)
the rabbit would get energy from eating the plant
in this case the wolf would energy from eating the rabbit but in a normal setting the wolf could get energy from eating any animal
Answer:
Explanation: A wolf gets its energy from food and water
A rabbit gets its energy from food and water too
A plant get it energy from sunlight, rain
A mushroom also get its energy from dead plant/animal’s
If this wasn’t the answer you wanted I’m sorry
which solute will result in a molecular solution?
a. HCN
b. Ba(OH)2
c. CH3COOH
d. CH3CH2OH
Answer:
d. CH3CH2OH
Explanation:
Molecular solution are solutions when a molecular compound is dissolved in them.
CH3CH2OH represents Ethanol or alcohol carrying "OH" group and is a molecule. CH3CH2OH or Ethanol forms a molecular solution in water.
The equation for Ethanol dissolving in water as follows:
CH3CH2OH(l) => CH3CH2OH(aq)
CH3CH2OH srays together as molecules. During dissolving, ethanol molecule fit into spaces between water molecules and completely mix with water.
While HCN, CH3COOH and Ba(OH)2 form ionic solution.
Hence, the correct option is d. CH3CH2OH.
how does the sun rise and set on the spring and fall equinox
Answer:
Actually, the Sun only rises due east and sets due west on 2 days of the year the spring and fall equinoxes! On other days, the Sun rises either north or south of "due east" and sets north or south of "due west." ... At the fall equinox, the Sun rises due east and sets due west.
Explanation:
Sunrise and Sunset - Stanford Solar Center
Which gas relights a glowing splint? *
C hydrogen
A ammonia
B carbon dioxide
D oxygen
Answer:
Oxygen
Explanation:
A glowing splint applied to a sample of gas "oxygen" will relight.
What is the potential energy of the bowling ball as it sits on top of a building?
Answer:
Potential energy is the amount of energy calculated from an object's height off the ground.
Explanation:
Potential energy = Mass x Height x Gravity
Why do you subtract the mass of the solute from the total mass desired when making mass percent calculations?
We can represent the concentration of a material even when we don't know its molecular mass, since mass percentage and parts per million or a billion are just alternative ways of expressing the ratio of the mass of a solute to the mass of the solution.
What is molecular mass ?The mass of a certain molecule is its molecular mass, which is expressed in daltons. Because they contain various isotopes of an element, multiple molecules of the same substance can have distinct molecular weights.
More solute can be dissolved in a given volume of solution to increase concentration, since doing so increases the mass of the solute. By allowing some of the solvent to evaporate, which reduces the volume of the solution, concentration can be increased.
The amount of a solute that is present in a specific amount of solvent or solution is known as the concentration of a solution. Controlling the stoichiometry of reactants for solution reactions requires knowledge of the solute concentration.
Thus, We can represent the concentration of a material even when we don't know its molecular mass.
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