Answer:
D
Explanation:
SOMEONE HELP ME PLEASE ILL GIVE BRAINLY!
Is the following picture an example of a chemical change or a physical change?
A chemical change, because the atoms are rearranging to form new molecules.
A physical change, because the molecules are staying the same.
A chemical change, because the molecules are staying the same.
A physical change, because the atoms are rearranging to form new molecules.
Answer:
It would be a physical change, because the atoms are rerranging to form new molecules!
Explanation:
1. A mathematical equation that predicts how a physical phenomenon will behave
hypothesis
2. A predicted experimental outcome based on prior knowledge and experience.
quantitative data
3. The variable that is changed on purpose by the scientist.
independent variable
4. The variables that must be kept constant so as not to bias or influence the results
scientific law
5. Data that is descriptive rather than numerical
qualitative data
6. Data that is numerical
control variable
7. A well tested explanation for why a physical phenomenon occurs
scientific theory
Answer:
1. A mathematical equation that predicts how a physical phenomenon will behave - Scientific law
2. A predicted experimental outcome based on prior knowledge and experience - Hypothesis
3. The variable that is changed on purpose by the scientist - Independent variable
4. The variables that must be kept constant so as not to bias or influence the results - Control variable
5. Data that is descriptive rather than numerical -Qualitative data
6. Data that is numerical - Quantitative data
7. A well tested explanation for why a physical phenomenon occurs - Scientific theory
Explanation:
In the method of science in understanding and explaining phenomena in the universe, observations are made, explanations are put forward, experimented and tested, before conclusions are made. Explanations of some common terms in the scientific process is given below:
1. A scientific law is a mathematical equation that predicts how a physical phenomenon will behave.
2. A hypothesis is a predicted experimental outcome based on prior knowledge and experience.
3. A independent variable is the variable that is changed on purpose by the scientist.
4. A control variable is the variable that must be kept constant so as not to bias or influence the results.
5. Qualitative data is data that is descriptive rather than numerical.
6. Quantitative data is data that is numerical
7. A scientific theory is a well tested explanation for why a physical phenomenon occurs.
What types of atoms will experience radioactivity?
Answer:
Alpha particles, Beta particles, Gamma rays
Alpha Is the least harmful
Beta is second most harmful
Gamma is most dangerous
Explanation:
There are several different models that represent compounds. One type of model is shown.
3 C's connected in a line by 2 black lines. The first and third C's each have 3 H's connected to them by a single black line each. The middle C has 2 H's connected to it by a single black line each.
What type of model is shown?
A) structural formula
On edge
Answer:
A
Explanation:
Atoms don’t absorb all wavelengths of light because of…
a. Their valence electrons
b. Their shells
c. Their color
d. They do absorb all wavelengths of light
Answer:
b. Their shells
Explanation:
The electronic shell of atoms represents the energy levels in a particular atom.
To understand the way atoms absorb energy, we must know that the wavelength absorbed is commensurate with the energy of the atom. This available energy allows for specific amount of energy to be absorbed.
Therefore, the electronic shell in an atom determines the absorption wavelength of the atom.
I'll give brainliest
Answer: Nitrogen
Explanation:
*NEED HELP ASAP!*
Click on photo!
Please help meeee!!!
Answer:
What type of math are you taking.:)
Answer:
CaO
Explanation:
becoz
Ca O
2 2
you must crossing over the eqn
and get CaO
In DNA, adenine always pairs with?
Thymine
cytosine
Guanine
PLEASEEEE Hurry its due in 20 min
Complete and balance each of the following equations for acid-base reactions.
HClO4(aq)+NaOH(aq)→
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
HCl[tex]O_{4}[/tex](aq) + NaOH → NaCl[tex]O_{4}[/tex](aq) + [tex]H_{2} O[/tex](l)
Explanation:
water is a liquid if you can't see
where was hydrogen discovered
Answer:
maybe greece
Explanation:
by henry cavendish in 1766
what are the properties of iconic compounds?
what are the properties of covalent compounds?
which type of compound is sugar?
someone plzz help!
Answer:
in details
Explanation:
what are the properties of iconic compounds?
Ionic compounds exist in the form of ionic groupings in certain forms called (crystalline forms), and we find in these shapes an organized crystal arrangement of ions so that every ion with a specific charge is attracted to a group of ions with the opposite charge, meaning that one ion is bound by several ionic bonds. At the same time, this explains the presence of ionic compounds usually in the solid state (high density). This situation also explains the high melting and boiling points of these compounds.
One of the most important characteristics of ionic compounds is their inability to conduct electrical conductivity in the solid state due to the ions binding and their inability to move while they become conductive of electricity when they are melted or dissolved in water (ions are free to move in the melt and in the aqueous solution).
And among its most important characteristics:
1- It dissolves in water and does not dissolve with benzene, for example (salt) because water is a polar solvent that can separate ions from each other.
2- It has a high melting point due to the force of electrostatic attraction between the positive and negative ions.
3- Its state is solid under normal conditions, due to the force of the electrostatic attraction between the positive and negative ions.
4- Solid ionic compounds do not conduct electricity, but their solutions with water conduct electricity, because when the compound is solid, the ions are connected to each other, but when the compound is a solution, the ions are free to move and conduct the electromagnetic current.
what are the properties of covalent compounds?
In covalent compounds (unlike ionic compounds), we can talk about independent molecules, as covalent compounds are composed of independent molecules linked together by different bonds (van derval, hydrogen) of varying strength. So there are covalent compounds in all three cases according to the strength of these bonds. There are covalent compounds in a gaseous state (weak bonds between molecules), covalent compounds in a liquid state, and also there are covalent compounds in a solid state (strong bonds between molecules). The same is true for melting and boiling points, so covalent compounds Their boiling and melting points vary according to the quality and strength of the bonds between the molecules.
As for the electrical conductivity, in the pure state, the covalent compounds are mostly non-conductive because they are not originally charged or because they are electrically neutral in the presence of charges, but the charged ones may have what is known as the electric torque and will come.
Likewise, in their smelters, the molten solid covalent compound (such as molten sugar) is not conductive of electricity. As for the solution, it may be non-conductive as in the case of a sugar solution or be conductive as is the case in a solution of hydrogen chloride (hydrochloric acid) and the reason for conducting or not in the solution is due to The covalent compound ionization (conversion into separate ions by the action of a solvent) or its de-ionization.
Sugar does not ionize when dissolved in water. Rather, its molecules only separate from each other, while hydrogen chloride does ionize to the hydrogen ion and the chlorine ion.
which type of compound is sugar?
The chemical or molecular formula for sucrose is C 12 H 22 O 11, which means that each sugar molecule contains 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms. A type of sugar called sucrose is also known as sucrose. It is a sucrase made in many different plants.
The properties of the compounds are the following:
a. The properties of the ionic compounds are they are hard, form crystals, have high melting and boiling point, good insulators.
b. The properties of the covalent compound are they are soft, do not form the crystal, have low melting and boiling point, bad insulators.
c. Sugar is a covalent compound.
What is a covalent compound?Covalent compounds are attracted by covalent bonds. They make bonds by sharing one or more pairs of valence electrons.
What is an ionic compound?These compounds are ions or charged particles. They make bonds when an atom or more atoms lose or gain electrons.
Thus, the properties are a. The properties of the ionic compounds are they are hard, form crystals, have high melting and boiling point, good insulators.
b. The properties of the covalent compound are they are soft, do not form the crystal, have low melting and boiling point, bad insulators.
c. Sugar is a covalent compound.
Learn more about covalent compounds
https://brainly.com/question/14752836
Can someone pls do this
Explanation:
Sodium sulfate
Na₂SO₄
The sulfate ion is SO₄²⁻
Sodium sulfite
Na₂SO₃
The sulfite ion is SO₃⁻
Sodium sulfide
Na₂S
The sulfide ion is S²⁻
Sodium phosphate
Na₂PO₄
Phosphate ion is PO₄²⁻
Sodium phosphite
Na₃PO₃
The phosphite is PO₃³⁻
Sodium phosphide
Na₃P
The phosphide ion is P³⁻
2.
Which one of the following substances is a compound?
A. Hydrogen
B. Tron
C. Oxygen
D. Sodium fluoride
Explain your answer:
The energy of a gamma ray photon whose frequency is 5.02 x 1020 Hz?
Answer:
The energy of photon is 33.28×10⁻¹⁴ J
Explanation:
Given data:
Frequency of photon = 5.02×10²⁰ Hz
Energy of photon = ?
Solution:
E = h.f
h = planc'ks constant = 6.63×10⁻³⁴ Js
by putting values,
E = 6.63×10⁻³⁴ Js × 5.02×10²⁰ Hz
Hz = s⁻¹
E = 33.28×10⁻¹⁴ J
The energy of photon is 33.28×10⁻¹⁴ J.
25 points , hi! please look at the attachment for the question, I'm having a hard time because all I have to do is solve through those 2 problems but I'm not sure if I solve the fractions first then multiply that result by 100 or what. I asked my teacher which she helped a little but I don't think she understood where I was lost. If you can help I would really appreciate it. Thank you.
This was the set up question:
4. If 100.0g of nitrogen gas (N2) is reacted with 100.0g of hydrogen gas (H2) to form NH3. What is the limiting and excess reactants?
Hint: Convert grams to moles for each reactant and then convert to moles of NH3. You need your balanced equation from answer 1 to determine the mole relationship between each reactant and the product NH3. Use the periodic table to determine the molar mass of all chemical formulas. Fill in the “?” blanks below to show your work.
and in the screenshot it has everything I'm working with and the conclusions I need to draw from it, I can draw the conclusions just fine on my own but I need help solving.
Answer:
To answer the question, we correctly fill the attached screenshot as follows;
3H₂ + N₂ → 2NH₃The molar mass of H₂ = 2 g/mol[tex]100.0 g \ H_2 \times \dfrac{1 \ mol \ H_2}{2 \ g \ H_2} \times \dfrac{2 \ mol \ NH_3}{3 \ mol \ H_2} = 33.\bar 3 \ mol \ NH_3[/tex]
The molar mass of N₂ = 28 g/mol
[tex]100.0 g \ N_2 \times \dfrac{1 \ mol \ N_2}{28 \ g \ N_2} \times \dfrac{2 \ mol \ NH_3}{1 \ mol \ N_2} \approx 7.143 \ mol \ NH_3[/tex]
A. Therefore, the excess reactant is hydrogen gas H₂ because it makes the most amount of ammonia, NH₃ (33.[tex]\bar 3[/tex] moles of NH₃)
B. The limiting reactant in nitrogen, N₂, because it is the reactant that makes the least amount of the ammonia, NH₃ (approximately 7.143 mol NH₃)
C. The theoretical yield of ammonia, is the maximum amount of ammonium that can be produced from the reaction between the 100 g of hydrogen gas, H₂, and 100 g of nitrogen gas, N₂ which is given by the amount of ammonia produced by the limiting reactant which is approximately 7.143 mole of NH₃
Explanation:
Answer:
Explanation:
Did u ever get answer
HUNK
FREE
IN PE
-05
HAE
-B. AFFEE
EMME
"Lanthanide serie
**Actinide series
Where are the non metals located
Answer:
What??? I don't understand.
Explanation:
Describe the two types of mechanical energy
Answer:
Kinetic energy and potential energy
Explanation:
kinetic energy is when the energy is active and potential energy is when it is about to be active
The ground state electron configuration of As
Answer:
Arsenic atoms have 33 electrons and the shell structure is 2.8. The ground state electron configuration of ground state gaseous neutral arsenic is [Ar]. 3d10. 4s2.
Explanation:
What is the density of a
sample of a substance with a volume of
120 mL and a mass of 90 grams?
Answer:
The density of the unknown substance is 0.75 g/mL.
Explanation:
We are given the volume and mass of a substance and are asked to find the density.
Density is determined with the formula [tex]d=\frac{m}{v}[/tex], where d is the density, m is the mass of the substance, and v is the volume the substance occupies.
Therefore, the density can be found by dividing the mass and volume.
We are given and can determine that:
The volume is 120 mL (v).The mass of the substance is 90 grams (m).Our derived unit is going to be g/mL.Now, let's set up the math required.
[tex]d = \frac{90 \ \text{grams}}{120 \ \text{mL}}\\\\d = \frac{3 \ \text{grams}}{4 \ \text{mL}}\\\\d = \frac{3}{4} \ \text{grams per mL}\\\\d = \frac{3}{4} \ \text{g/mL}\\\\ \bold{d = 0.75 \ \bold{g/mL}}[/tex]
Therefore, the density of the substance is 0.75 g/mL.
A solution that has a high concentration of hydrogen ions has what type of pH?
7
14
13
2
Answer:
2
Explanation:
A solution of copper sulfate (CuSO4) produced by bioleaching has a concentration of 0.319 g/dm3 Relative atomic masses (Ar): Cu = 63.5 O = 16 S = 32 Calculate the number of moles of copper that can be produced from 1 dm3 of this solution.
moles Cu produced : 0.002
Further explanationConcentration of copper sulfate (CuSO₄) : 0.319 g/dm³
MW CuSO₄ :
[tex]\tt =63.5+32+4\times 16=159.5~g/mol[/tex]
mol CuSO₄ /dm³ :
[tex]\tt \dfrac{0.319}{159.5}=0.002[/tex]
CuSO₄⇒Cu²⁺ + SO₄²⁻
mol Cu : mol CuSO₄ = 1 : 1 , so mol Cu²⁺=0.002
Below is a phase diagram for Carbon Dioxide. Use this diagram to answer the following question.
In this example we will start the Carbon Dioxide out at a temperature of -20oC and 1 atm of pressure. If the pressure was raised to 100 atm of pressure while still staying at -20oC, what phases would the Carbon Dioxide change between?
What’s the answer????
Answer:
D=Wavelength A=Amplitude C=Crest F=At rest point
Explanation:
Forgive me if I am wrong!
How can radiation, conduction, and convection affect a city? (like Atlanta)
Jimmy has a sick friend who called and asked him to bring over some soup from the store. Jimmy rode his bicycle from his house to the store and then to his friend's house. What is the total distance Jimmy traveled?
Answer:
See the answer below
Explanation:
The total distance Jimmy traveled would be the sum of the distance covered from his house to the store and then from the store to his friend's house. The total distance covered can be determined if the average speed of Jimmy and the time he took to cover the distance are known.
Average speed = total distance traveled/total time taken
Hence,
total distance traveled = average speed x total time.
How do i caculate speed
Answer:
Speed uses the same units as velocity, which is meters divided by seconds (m/s)(It doesn't need to be m/s, but it's the most common unit. It's basically any unit of length divided by any unit of time)
hope this helps and good luck
Answer/Explanation:
Speed is a force and is solved by using acceleration.
You can use the problem to solve for force:
F= MA or Force equals mass times acceleration.
If the reacants of a chemical raction have 15 Carbon atoms, 72 Lead
atoms, and 88 Nitrogen atoms, what will the products have?
Answer:
In the human body, potential energy is stored in the bonds between atoms and molecules. Chemical energy is the form of potential energy in which energy is stored in chemical bonds. When those bonds are formed, chemical energy is invested, and when they break, chemical energy is released. Notice that chemical energy, like all energy, is neither created nor destroyed; rather, it is converted from one form to another. When you eat an energy bar before heading out the door for a hike, the honey, nuts, and other foods the bar contains are broken down and rearranged by your body into molecules that your muscle cells convert to kinetic energy.
Explanation:
What two molecules are involved in cellular respiration?
Protein
oxygen
glucose
fiber
In lab you reacted 60 grams of propane (C3H8) with 13 grams of oxygen gas (O2). Your
reaction made 63 grams of water (H2O). The reaction is shown below:
How much carbon dioxide (CO2) is released into the air?
C3H8 + 5O2 ------> 3CO2 + 4H2O
10 g
73 g
120 g
1368
Answer:
120g
Explanation:
Based on the reaction, when 1 mole of propane and 5 moles of oxygen react, 3 moles of CO2 and 4 moles of H2O are produced. The ratio of production is 3 moles of CO2 per 4 moles of H2O.
Thus, we need to convert mass of water to moles using its molar mass:
Moles H2O (Molar mass: 18g/mol):
63g H2O * (1mol / 18g) = 3.5 moles H2O
Converting to moles of CO2:
3.5 moles H2O * (3 moles CO2 / 4 moles H2O) = 2.625 moles CO2
Mass CO2 (Molar mass: 44g/mol):
2.625 moles CO2 * (44g / mol) = 115.5g of CO2 are released
120gSOMEONE HELP ME PLEASE ILL GIVE BRAINLY
Snapping an instant cold pack is a
Change in temperature
Formation of gas/bubbles
Formation of precipitate
Release of energy (fire/light)
Change in color
Answer:
Answer
Change in temperature
It is an example of an endothermic reaction. It is absorbing heat.