Answer:
The molecular formula of X is given as [tex]C_7 H_6 O_3[/tex]
Explanation:
[tex]Moles $C O_{2}=\frac{\text { mass }}{\text { molar mass }}=\frac{13.39 \mathrm{g}}{44.01 \mathrm{g} \text { per mole }}=0.304 \mathrm{mol}$\\\\moles $\mathrm{C}=$ moles $\mathrm{CO}_{2}=0.304 \mathrm{mol}$[/tex]
[tex]mass $C=$ moles $\times$ molar mass $=0.304 \mathrm{mol} \times 12 \frac{g}{m o l}=3.65g$\\\\moles $\mathrm{H}_{2} \mathrm{O}=\frac{2.35 \mathrm{g}}{18.02 \mathrm{g} \text { permole }}=0.130 \mathrm{mol}$\\\\moles $\mathrm{H}=2 \times$ moles $\mathrm{H}_{2} \mathrm{O}=0.130 \times 2=0.260 \mathrm{mol}$\\\\Mass $\mathrm{H}=0.260 \mathrm{mol} \times 1.008 \frac{g}{\mathrm{mol}}=0.262 \mathrm{g}$[/tex]
mass O = Total mass of the compound - (mass of C + mass of H)
=6.0 g - ( 3.65 + 0.262 ) g
=2.09 g
[tex]moles $O=\frac{2.09 g}{16 g \text { per mole }}=0.131 \mathrm{mol}$[/tex]
Least moles is for O that is 0.131mol and dividing all by the least we get
[tex]$\begin{aligned} C &=\frac{0.304}{0.131}=2.3 \\\\ H &=\frac{0.260}{0.131}=2 \\\\ O &=\frac{0.131}{0.131}=1 \end{aligned}$[/tex]
Since 2.3 is a fraction it has to be converted to a whole number so we multiply all the answers by 3
[tex]\\$C 2.3 \times 3=7$\\\\$H 2 \times 3=6$\\\\$O 1 \times 3=3$[/tex]
So the empirical formula is [tex]C_7 H_6 O_3[/tex]
Empirical formula mass
[tex]=(7 \times 12) +(6\times1.008)+(3\times16)=138.048g[/tex]
[tex]$n=\frac{\text { molar mass }}{\text { empirical formula mass }}=\frac{138}{138.048}=1$[/tex]
Molecular formula =n × empirical formula
[tex]=1 \times C_7 H_6 O_3[/tex]
Compound X = [tex]C_7 H_6 O_3[/tex] is the Answer
To find the molecular formula of Compound X, we calculate the empirical formula using the moles of carbon dioxide and water produced. The empirical formula is CH2O. The molecular formula is (CH2O)5.
Explanation:To find the molecular formula of Compound X, we need to determine the empirical formula first. From the given information, we can calculate the moles of carbon dioxide and water produced. The moles ratio of carbon to oxygen in carbon dioxide is 1:2, while the moles ratio of hydrogen to oxygen in water is 2:1. Using these ratios, we can find the moles of carbon, hydrogen, and oxygen in Compound X. The empirical formula of X is CH2O.
The molar mass of the empirical formula is 30 g/mol. To find the molecular formula, we divide the molecular molar mass of X by the molar mass of the empirical formula. Dividing 138 g/mol by 30 g/mol gives us approximately 4.6, which we can round to 5. This means the molecular formula of X is (CH2O)5.
Learn more about Molecular formula of Compound X here:https://brainly.com/question/9230857
#SPJ3
Hydrogen has three naturally occurring isotopes which figure into the average atomic mass found on the periodic table. (1.00974) : hydrogen -1, hydrogen -2, and hydrogen -3. How do hydrogen -1, hydrogen -2, and hydrogen -3 differ from each other? Which would you guess is most abundant? Explain your answer.
PLEASE HELP ME!!!,! ITS FOR AN IMPORTANT LAB
Answer:
H 1 one proton and no neutrons, H2 one proton and one neutron, H3 one proton and 2 neutrons.
H1 most abundant because average mass is 1.008, meaning far more have a mass of 1
Explanation:
What does it mean if Gram-negative bacteria are found in the sample? Why would they be present in the sample?
Answer:
See explanation
Explanation:
In yogurt are usually found, (several ) types of gram- positive bacteria. Those bacterias are used to made yogurt, and don't bring negative effects on the human body. These bacterias are Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus bacteria.
When doing a gram-staining on a yogurt sample, this staining will show a positive result if there are gram- positive bacteria present, what is most likely to happen.
In a yogurt sample, normally, no gram-negative bacteria will occur. Although, if gram - negative bacteria will be found. This means the yogurt sample is infected. Those bacteria are (probably) diarrhea causing bacteria such as E. coli and Salmonella.
If gram-negative bacteria are found in the sample, the gram-staining will be negative and show red/pink bacteria.
Which of the following is the best example of a hypothesis?
Glass breaks when you throw a rock at it.
If three or more pounds of pressure is placed on glass, then it will break.
If I push hard on glass it will break.
When glass breaks it is because something was thrown at it.
Answer:
If three or more pounds of pressure is placed on glass, then it will break.
Explanation:
This is a hypothesis because it is a statement that can be tested and can be drawn a conclusion from, as you can see the others can be tested but then you have too many factors that are not taken care of, for example how big will the rock you throw to the glass be, glasses cna break because of changes in temperature, and other factors that weren´t taken into account when doing them that the only one that could work as a hypothesis would be: If three or more pounds of pressure is placed on glass, then it will break.
Final answer:
The best example of a hypothesis is "If three or more pounds of pressure is placed on glass, then it will break," as it is clear, specific, and testable.
Explanation:
The best example of a hypothesis among the given options is: "If three or more pounds of pressure is placed on glass, then it will break." This statement is a good hypothesis because it is testable, provides a specific condition (three or more pounds of pressure), and predicts a measurable outcome (the glass will break). A testable hypothesis is a crucial aspect of the scientific method.
It allows researchers to perform experiments to verify whether the predicted outcomes agree with the hypothesis or not. The process of testing is essential because it provides evidence to support or refute the proposed explanation. Furthermore, an effective hypothesis should ideally be clear and concise, providing a direct answer to a particular question, and should outline conditions that can be empirically examined.
Having molecules that are very close together
Answer:
Solid Molecules
Solid molecules are always together. If you need more help I'm here.
Answer:in solids the molecules are very close together with intermolecar spaces.
Explanation:
Which of the following statements is true?
The scientific method is based on personal judgment.
Every Thursday Patrick eats pizza. This is a cause and effect relationship.
A false hypothesis means there is something wrong with the experiment.
Sharing an experiment with a friend is a great way to communicate results.
Answer:
the correct answer is D
Explanation:
D is correct because it is true and is also used to share experiments with other scientists around the world
Which equation represents the combined gas law?
o Pq Va = P2 V2
| VI VÀ
O TT
Pq Vq Tq = P₂ V 2T 2
Answer:
The answer to your question is below:
Explanation :
The combined gas law as it name says it combines three gas laws: Boyle's law, Charles' law and Gay Lussac Law. It states that at initial conditions of pressure, volume and temperature, it there is a change in one of this variables
the equilibrium will be equivalent to a second equilibria of pressure, volume and temperature.
[tex]\frac{P1V1}{T1} = \frac{P2V2}{T2} \\[/tex]
"1" indicates initial conditions
"2" indicates final conditions
The combined gas law is represented by the equation P1V1/T1 = P2V2/T2 and is used to model the behavior of gases when the number of moles and the ideal gas constant are constant.
The equation that represents the combined gas law is:
P1V1/T1 = P2V2/T2
This law combines Boyle's law, Charles's law, and Gay-Lussac's law, and it is used when the number of moles (n) of a gas and the ideal gas constant (R) are held constant. The combined gas law allows us to predict how a gas will behave under different sets of conditions in terms of pressure (P), volume (V), and temperature (T), assuming the amount of gas in moles does not change.
Examples of Gas Laws:
Boyle's Law: P1V1 = P2V2 (at constant n and T)
Charles's Law: V1/T1 = V2/T2 (at constant n and P)
Gay-Lussac's Law: P1/T1 = P2/T2 (at constant n and V)
Each can be derived from the combined gas law depending on which variables are held constant.
what is the density of an 820 g sample of pure silicon occupying a 350 cm3 container
Answer:
2.343 g/ cm³
Explanation:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
Symbol:
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.
Given data:
density = ?
volume= 350 cm³
mass= 820 g
Now we will put the values in the formula,
d= m/v
d= 820 g/ 350 cm³
d= 2.343 g/ cm³
The density of silicon is 2.343 g/ cm³
The density of a sample of pure silicon, given its mass is 820 grams and its volume is 350 cm^3, is calculated by dividing mass by volume. Using this formula, the density of the silicon sample is approximately 2.34 g/cm^3.
Explanation:The subject of your question falls under Physics and it is about the concept of density. More specifically, you are asking about the density of a sample of pure silicon. Density is defined as the mass of an object divided by its volume which is usually measured in grams per cubic centimeter (g/cm3). Given that the mass of the silicon sample is 820 grams and its volume is 350 cm3, we can calculate the density using the following formula for density:
Density = Mass / Volume
In this case, Density = 820g / 350cm3. So, the density of the silicon sample is approximately 2.34 g/cm3.
Learn more about Density here:https://brainly.com/question/29775886
#SPJ3
If both the first and second shells of an atom are full, what is the total number of electrons present in that atom?
Answer:
10
Explanation:
the capacity for each shell for the first 20 elements can be given by
2.8.8.2
2 electrons in the first shell
8 in the 2nd and in the 3rd
and 2 in the 4th
so if both the first and 2nd shells are full,
2+8=10 electrons
Answer:
10 is the total number of electrons present in that atom.
Explanation:
The formula for total number of electron in nth shell is given by :[tex]2n^2[/tex]
First shell = 1
Number of electron in first shell,n = 1:
= [tex]2(1)^2= 2[/tex]
Number of electron in first shell,n = 2:
= [tex]2(2)^2= 8[/tex]
Total number of electrons in the atom with full first shell and second shell:
2 + 8 = 10
What is the sum of all charges in the formula for an ionic compound?
Answer:
The sum of all the charges should equal the charge on the ion.
Answer:The overall charge for the ionic compound must be neutral, which means the sum of the charges from the cations and anions should add up to zero
Explanation:
Which of the following best explains the position of the two atoms in the periodic table? (4 points)
Atoms in the periodic table are positioned based on their chemical properties and electron configuration. Elements with the same number of valence electrons are placed in the same group. The periodic table is read left to right and top to bottom, with elements arranged in order of increasing atomic number.
Explanation:The position of two atoms in the periodic table can be explained based on their chemical properties and electron configuration. Atoms that have the same number of valence electrons, or electrons in their outermost energy level, are placed in the same group. For example, lithium (Li) and sodium (Na) are both in Group 1 because they each have one valence electron. The periodic table is read left to right and top to bottom, with elements arranged in order of increasing atomic number. The atomic number represents the number of protons in an atom's nucleus.
Learn more about position of atoms in the periodic table here:https://brainly.com/question/4195285
#SPJ12
How many calories would be needed to heat 5.0 lbs of copper from 22 degrees C to 80.0 degrees C? C for copper = 0.092
Answer:
[tex]1.21\times 10^4[/tex] cal would be needed to heat 5.0 lbs of copper from 22 degrees C to 80.0 degrees C.
Explanation:
[tex]Q=m \times c \times \Delta T[/tex]
where
[tex]\Delta T[/tex] = Final T - Initial T
Q is the heat energy in calories
c is the specific heat capacity (for copper 0.092 cal/(g℃))
m is the mass of water
plugging in the values
[tex]$Q=5.01 b s \times 0.092 \frac{c a l}{g^{\circ} \mathrm{c}} \times\left(80.0^{\circ} \mathrm{C}-22^{\circ} \mathrm{C}\right)$[/tex]
Please Note:
1 lb = 453.592grams
So,
5 lbs = 5 × 453.592g = 2268 g
[tex]$\begin{aligned} Q &=2268 g \times 0.092 \frac{c a l}{g^{\circ} \mathrm{C}} \times 58^{\circ} \mathrm{C} \\\\ Q &=12102 \mathrm{cal} \end{aligned}$[/tex]
[tex]=1.21\times10^4[/tex] cal (Answer)
Why it is important for steel to go through a fluid phase as it is being produced
Final answer:
Steel production requires a fluid phase to allow the removal of impurities and the addition of alloying elements, producing steel with specific properties including enhanced strength and durability. The introduction of processes like the Bessemer and open-hearth methods facilitated cheaper and more efficient steelmaking. Controlled diffusion of carbon and other elements during the fluid phase is crucial to achieving the desired qualities of steel.
Explanation:
Steel production is a critical process in industrial manufacturing, transforming wrought iron into steel with superior strength and durability. Steel goes through a fluid phase during production because this allows for the removal of impurities and the integration of essential alloying elements. The Bessemer process and the open-hearth process both revolutionized steelmaking, enabling production at higher temperatures and larger quantities, thus reducing costs and facilitating widespread industrial use.
During the fluid phase, controlled amounts of carbon and other elements such as manganese, chromium, nickel, tungsten, molybdenum, and vanadium are added to create various steel alloys tailored for specific applications. The presence of carbon is particularly crucial; if not carefully managed, excess carbon can make steel brittle.
Diffusion plays an essential role in this process, particularly in carburizing, which increases the surface hardness of iron by allowing carbon to diffuse into it at high temperatures, turning it into hardened steel. This phase is vital for achieving the correct balance of mechanical properties required for steel's various industrial uses.
The pOH of a solution is 10.75. What is the concentration of OH ions in the solution?
Use [OH-10 POH
3.162 x 10-108 M
1.778 x 10-11 M
1.075 x 102 M
5.623 x 1010 M
Answer:
hope this helps
Explanation:
Answer: The hydroxide ion concentration in the solution is [tex]1.778\times 10^{-11}M[/tex]
Explanation:
pOH is defined as the negative logarithm of hydroxide ion concentration present in the solution.
The equation used to calculate pOH of the solution is:
[tex]pOH=-\log[OH^-][/tex]
We are given:
pOH = 10.75
Putting values in above equation, we get:
[tex]10.75=-\log[OH^-][/tex]
[tex][OH^-]=10^{-10.75}=1.778\times 10^{-11}M[/tex]
Hence, the hydroxide ion concentration in the solution is [tex]1.778\times 10^{-11}M[/tex]
When an object floats in water, it displaces a volume of water that has a weight equal to the weight of the object. If a ship has a
weight of 4795 tons, how many cubic feet of seawater will it displace? Seawater has a density of 1.025 g.cm3; 1 ton = 2000 lb.
(Enter your answer in scientific notation.)
Answer:
[tex]\boxed{1.574 \times 10^{5}\text{ ft}^{3}}[/tex]
Explanation:
1. Mass of ship in pounds
[tex]m = \text{4795 t} \times \dfrac{\text{2000 lb}}{\text{1 t}} = 9.590 \times 10^{6}\text{ lb}[/tex]
2. Mass of ship in kilograms
[tex]m = 9.590 \times 10^{6}\text{ lb} \times \dfrac{\text{1 kg}}{\text{2.205 lb}} = 4.349 \times 10^{6}\text{ kg}[/tex]
3. Mass of ship in grams
[tex]m = 4.349 \times 10^{6}\text{ kg} \times \dfrac{\text{1000 g}}{\text{1 kg}} = 4.349 \times 10^{9}\text{ g}[/tex]
4. Volume of water displaced
[tex]V = 4.349 \times 10^{9}\text{ g} \times \dfrac{\text{ 1.025 cm}^{3}}{\text{1 g}} = 4.458 \times 10^{9}\text{ cm}^{3}[/tex]
5. Volume of water in litres
[tex]V = 4.458 \times 10^{9}\text{ cm}^{3} \times \dfrac{\text{ 1L}}{\text{1000 cm}^{3}}= 4.458 \times 10^{6}\text{ L}[/tex]
6. Volume of water in cubic feet
[tex]V = 4.458 \times 10^{6}\text{ L} \times \dfrac{\text{ 1 ft}^{3}}{\text{28.32 L}}= \mathbf{1.574 \times 10^{5}}\textbf{ ft}\mathbf{^{3}}\\\\\text{The ship will displace } \boxed{\mathbf{1.574 \times 10^{5}}\textbf{ ft}\mathbf{^{3}}} \text{ of seawater}[/tex]
Final answer:
When an object floats in water, it displaces a volume of water equal to its weight. To find the volume of seawater displaced by a ship weighing 4795 tons, convert the weight to pounds and calculate the volume using the density of seawater. The ship will displace approximately 149,701 cubic feet of seawater.
Explanation:
When an object floats in water, it displaces a volume of water that has a weight equal to the weight of the object. To find the volume of seawater displaced by a ship with a weight of 4795 tons, we need to convert the weight to pounds and then calculate the volume using the density of seawater.
1 ton is equal to 2000 pounds, so the weight of the ship in pounds is 4795 tons * 2000 pounds/ton = 9,590,000 pounds.
The volume of seawater displaced is equal to the weight of the ship divided by the density of seawater. The density of seawater is 1.025 g/cm³, which is equivalent to 64.027 pounds per cubic foot.
So the volume of seawater displaced by the ship is 9,590,000 pounds / 64.027 pounds per cubic foot = 149,701 cubic feet.
How do you draw the Lewis dot structure for CF2Cl2?
Answer:
C in the middle with 2x F and 2x Cl bound to it. Both F and Cl have 7 valence electrons. ( See photo)
Explanation:
Of the three ( C, F and Cl) carbon has the lowest electro negativity so we expect it to be in the middle.
C: 4e-
F: 7e- x 2 = 14e-
Cl: 7e- x2 = 14e-
4+14+14 = 32 electrons : octet rule
CF2CL2 = Dichloro Difluoro Methane,
To draw the Lewis dot structure for CF2Cl2, begin by calculating the total number of valence electrons, arrange the atoms with Carbon in the center, then create bonds and distribute the remaining electrons to observe the octet rule. The final Lewis structure would satisfy the octet rule for all atoms in the molecule.
Explanation:To draw the Lewis dot structure for CF2Cl2, we need to follow certain steps. Firstly, find the total number of valence electrons. Carbon (C) has 4, Fluorine (F) has 7 each, totaling 14 for the pair, and Chlorine (Cl) also has 7 each, totaling 14 as well for both atoms in the compound. This gives us a total of 32 valence electrons. Next, arrange the atoms with Carbon in the middle and fluorine, and Chlorine atoms surrounding it.
Now, draw a single bond between the Carbon and Fluorine atoms, and also the Carbon and Chlorine atoms to signify shared electrons and subtract the shared electrons from the total of 32. Each bond contains two electrons. The remaining 24 electrons should be distributed among the Fluorine and Chlorine atoms to satisfy the octet rule (each atom should have 8 electrons in its outer shell). This means adding three lone pairs to each Fluorine atom and each Chlorine atom.
The final notation would look like CF2Cl2 with each non-carbon atom surrounded by eight electrons, fulfilling the octet rule. The atom in the center, Carbon, also shares eight electrons, therefore, the octet rule is satisfied for every atom in the molecule.
Learn more about Lewis dot structure here:https://brainly.com/question/28652824
#SPJ6
Momentum is dictated by a P instead of an M.A football player is running down the field weight 90Kg he is running 11.1 m/s what is this momentum
Answer:
The momentum is 999 Kg.m/s.
Explanation:
Momentum:
It is the product of mass and velocity of moving object.
Formula:
P = m . v
P = momentum
m = mass
v = velocity
Unit:
Its unit is Kg. m/ s.
Given data:
mass = 90 Kg
velocity = 11.1 m/s
Solution:
p = m.v
p = 90 Kg × 11.1 m/s
p = 999 Kg.m/s
Can you determine which of two unknown elements has the larger radius if the only known information is that the atomic number of one of the elements is 20 greater than the other? Explain.
Answer:
Yes, you can determine which one.
Explanation:
Hi, there are many factors that can be used to compare the atomic radius of to elements but the most important is the amount of electrons each atom has.
The atomic number represents the amount of protons and electrons (if the element isn't ionized) that the atom has.
The more electrons the atom has, the more energy levels it completes. And each of this levels has a longer radius than the one before it.
So, higher levels completed represent longer atomic radius.
In conclusion, a element with an atomic number 20 greater than the other has 20 more electrons, completed more energy levels and its radius will be longer
An element is a _____ substance represents by a ______ symbol. Chemical symbols have ___ or ___ letters. The first letter of a chemical symbol is always a ______ letter and the second letter is always a ______ letter.
Answer:
Explanation:
An element is a _distinct____ substance represented by a __chemical____ symbol. Chemical symbols have _one__ or _two__ letters. The first letter of a chemical symbol is always a _Capital_____ letter and the second letter is always a _small_____ letter.
Elements are distint substances that cannot be split up into simpler substances. Such substances are made up of one kind of atom. Each of them is usually symbolised by a capital letter or a capital letter followed by a small letter derieved from the English or latin or greek name of the element.
An element is a chemical substance that cannot be divided or changed into other chemical substances. Chemical symbols are one- or two-letter designations of elements, with the first letter always capitalized and the second letter (if present) in lowercase. Symbols may be based on English or Latin names.
Explanation:An element is a chemical substance that can't be divided or changed into other chemi-cal substances by any ordinary chemical means. The smallest unit of an element is the atom.
A chemical symbol is a one- or two-letter designation of an element. Some examples of chemical symbols are O for oxygen, Zn for zinc, and Fe for iron. The first letter of a symbol is always capitalized. If the symbol contains two letters, the second letter is lower case. The majority of elements have symbols that are based on their English names. However, some of the elements that have been known since ancient times have maintained symbols that are based on their Latin names, as shown in Table 4.5.2.
Each element is designated by its chemical symbol, which is a single capital letter or, when the first letter is already “taken” by another element, a combination of two letters. Some elements follow the English term for the element, such as C for carbon and Ca for calcium. Other elements' chemical symbols derive from their Latin names; for example, the symbol for sodium is Na, referring to natrium, the Latin word for sodium.
Is whipping eggs a chemical change or a physical change
calculate the concentration of OH- of a solution of hydrobromic acid (HBr) given that its pH is 1.7
Answer:
Explanation: This is Quite matching Answer. The formula for pH is pH = -log[H+]. This means pH is the negative base 10 logarithm ("log" on a calculator) of the hydrogen ion concentration of a solution. To calculate it, take the log of the hydrogen ion concentration and reverse the sign to get the answer.
Subscribe to JELLO CRAFT
what are metalloids
A metalloid is an element that has properties that are intermediate between those of metals and nonmetals. Metalloids can also be called semimetals. On the periodic table, the elements colored yellow, which generally border the stair-step line, are considered to be metalloids.
Final answer:
Metalloids are elements with intermediate properties between metals and nonmetals, found along the staircase line of the periodic table and exclude aluminum and polonium. They are semiconductors with applications in electronics, as their conductivity increases with temperature. Silicon is a well-known metalloid, which is used for its semiconductor properties.
Explanation:
Metalloids are elements that exhibit properties intermediate between those of metals and nonmetals. These elements, sometimes referred to as semimetals, are located on the periodic table along a staircase line starting from element 5B (boron) and ending at 85At (astatine), excluding aluminum and polonium which are classified as metals. Metalloids such as boron, silicon, germanium, arsenic, antimony, and tellurium display a combination of metallic and nonmetallic characteristics, for instance, they tend to look metallic, but they do not conduct electricity as well as metals and thus are considered semiconductors.
These elements find numerous applications in the field of electronics due to their unique ability to control electrical conductivity. Their conductivity increases with temperature, a property that distinguishes them from metals and makes them valuable in electronic devices. The intermediate electronegativity and chemical behaviors are due to their electron structure, making them versatile in reactions; they form covalent crystals unlike metals but do not form monatomic anions like nonmetals. Silicon, a prominent metalloid, is particularly noted for its luster and brittleness.
What is the specific heat (J/g C)of a metal who’s temp increases by 3.0 C when 17.5 g of metal was heated with 38.5 J
Answer:
0.733 J/g °C
Explanation:
Step 1 : Write formule of specific heat
Q = mc Δ T
with Q = heat transfer (J)
with m = mass of the substance
with c = specific heat ⇒ depends on material and phase ( J/g °C)
Δ T = Change in temperature
in this case :
Q = 38.5 J
m = 17.5g
c= has to be determined
Δ T = 3 (°C)
Step 2: Calculating specific heat
⇒ via the formule Q = mc Δ T
38.5 J = 17.5g * c * 3
38.5 = 52.5 *c
c = 38.5 / 52.5
c = 0.733 J/g °C ⇒ 0.733 is reported to three significant digits due to the precision.
The specific heat of this metal is 0.733 J/g °C
which of the following is an example of inference? Explain WHY.
A. The girl is wearing red shoes
B. My science binder has 45 pages in it.
C. Ms. Sparks must be a great reader she is always carrying around books.
D. There is a cat sitting by the window.
Answer:
C
Explanation:
This is because you are guessing that since Mrs. Sparks always carries around books, she must be a great reader. All the other answers are just facts that you see. For c, you are guessing this.
Answer:
C
Explanation:
Must is the key word. An inference is a guess, you guess Ms. Sparks must be a great reader because she is always carrying around books. You don't know for sure she is a great reader which makes it an inference. Hope this helps!
Why do some transition metals have multiple oxidation states? Transition metals have multiple oxidation states because of their sublevel.
Answer:
because it contain 5 d-orbitals.
Explanation:
unlike alkali and alkaline earth metals, transition metals have 5d-orbitals. electrons are around the nucleus some are away and some are close to it. Electrons change their energy levels at suitable conditions and as transition metals having 5-d orbitals so its electrons can easily goes to other transition state thus causing multiple oxidation states.
Answer:
partially filled d sublevels
Explanation:
The blank variable in an investigation is the variable that changes in response to changes in the investigation
Answer:
Dependent
Explanation:
It is called that because its value depends on changes the investigator makes.
The ratio of the mass of O to the mass of N in N2O3 is 12:7. Another binary compound of nitrogen has a ratio of O to N of 16:7.
What is its formula?
Express your answer as a chemical formula.
Answer:
NO2
Explanation:
Molar mass of Nitrogen (N) is 14g/ mole . Molar mass of O is 16g/ mol. So the ratio of atoms of each is :
Moles of O = mass of O / Molar mass O = 12 / 16 = 0.75 = 3/4 mole of O
Moles of N = mass of N / Molar mass N = 7 / 14 = 0.5 = 1/2 mole of N
So to scale these fractions to a whole number, multiply both by 4.
4 x 3/4 = 3 moles of O; 4 x 1/2 = 2 moles of N. This confirms your first answer: N2O3.
Do the same for the ratio 16:7.
Moles O: 16 / 16 = 1 mole of O
Moles of N: 7 / 14 = 1/2 mole of N
This means for each 1/2 mole of N we have 1 mole of O; or for each mole of N we have 2 moles of O : the ratio is 2.
Multiplying both by 2: N = 1 mole; O = 2 moles. So the molecule is NO2.
Experiment #2
Question: Do different types of music affect how well a person can do his/her homework?
Hypothesis: Music that does not have a strong beat makes concentrating on a homework assignment easier.
Music with heavy beats makes concentration more difficult.
Experiment:
Sara Lilia pulled out four different CD's to find out which type helped her to finish her homework the
fastest. The first CD was rock, the second reggaeton, the third classical, and the fourth was cumbia. She chose a
math assignment that required concentration.
Sara Lilia used a stopwatch with an alarm to make sure that she only listened to each CD for 5 minutes.
Each time the alarm went off, Sara Lilia recorded how many problems she was able to finish.
At the end of the experiment, she found that she was able to concentrate the most with the classical
music, then the rock, and the cumbia. She noticed that she did not concentrate much at all with the reggaeton
and felt like dancing and singing along instead of working.
A. What was the independent variable?
B. What was the dependent variable?
C. What was the control?_
D. Was there a constant variable?
Answer:
Explanation:
An independent variable is a variable in which does not rely on how other variables. It is usually cause in an experiment. From Sara Lilia experiment, we can identify the different music genres as her independent variable.
The dependent variable here is her ability to concentrate in her study. Here, we should know that the dependent variable is often the result of the effects of the independent variable.
There is no control in the experiment. In the controlled set up, we would have put all other know factors that would make concentrations easier into consideration. It could be the environment, the arrangement of the room and a particular time of the day. None of such was stated in the experiment.
The constant variable is the variable that was held fixed throughout the experimental procedure. Here the time of study was fixed at 5minutes. What would happen to concentration if this time was shorter or much more?
what are cathode rays made of
Answer:
electrons
Explanation:
they are composed of negatively charged particles also known as electrons
Cathode rays are made up of electrons, which are particles with a negative charge and mass. This was determined through historical experiments that demonstrated cathode rays' deflection by magnetic and electric fields and measured their charge-to-mass ratio.
Explanation:Cathode rays are composed of particles known as electrons. Historical experiments conducted by scientists like J. J. Thomson and William Crookes revealed the nature of these rays. Using a cathode ray tube, Crookes observed that a paddle wheel placed between the electrodes moved from the cathode towards the anode upon the commencement of the tube, suggesting that the rays had mass. Similarly, Thomson's experiments, which involved deflecting the cathode ray with magnetic and electric fields, established that these rays are indeed made up of charged particles with a negative charge and have a specific mass-to-charge ratio.
The discovery that cathode rays are deflected away from a negatively charged electrical field and toward a positively charged field, along with their response to magnetic fields, was crucial in determining their particle nature. Thomson's calculation of the electron's charge-to-mass ratio further cemented the understanding of cathode rays, leading to the realization that electrons are fundamental components of all atoms, not just specific types of gases or metals used in the experiments.
On a caterpillar's map, all distances are marked in millimeters. The caterpillar's map shows that the distance between two milkweed plants is 4, 012milim . What is this distance in kilometers ?
Answer:
0.004012km
Explanation:
Problem:
Conversion of millimeters(mm) to Kilometers:
value given = 4012mm
Here, we are converting from a submultiple unit to a multiple unit.
Millimeter depicts 10⁻³m and kilometer stands for 10³m
Now, we must find how many exponents will take us from 10⁻³ to 10³
careful examination shows that if we multiply a power of 10⁶ to 10⁻³ it will give a 10³:
i.e 10⁻³ x 10⁶ = 10⁻³⁺⁶ = 10³
Therefore,
10⁶mm = 1km
4,012mm = [tex]\frac{4012}{1000000}[/tex] = 0.004012km
To convert millimeters to kilometers, we have to remember that 1 kilometer equals 1000 meters and 1 meter equals 1000 millimeters, hence 1 kilometer equals 1,000,000 millimeters. So, 4012 millimeters is equal to approximately 0.004012 kilometers.
Explanation:
The subject of this question pertains to unit conversion within the metric system. Given a distance measured in millimeters (mm), we want to convert this to kilometers (km). To convert, we will utilize the fact that 1 kilometer equals 1000 meters and 1 meter equals 1000 millimeters. Therefore, 1 kilometer equals 1,000,000 millimeters.
To convert 4012 millimeters into kilometers, we divide 4012 by 1,000,000, which gives us approximately 0.004012 kilometers. So, the distance between the two milkweed plants on the caterpillar's map, when converted to kilometers, is 0.004012 kilometers.
Learn more about Unit Conversion here:https://brainly.com/question/19420601
#SPJ3
All atoms of the element potassium have 19 protons. One of the most stable types of potassium atoms has the mass number 39.
Answer:
The correct answer for the given question is 20 neutrons.
Explanation:
As we know most of the elements have their isotopes present so the metal in the periodic table that has atomic number 19 and is named potassium has two stable isotopes.
One of the stable isotope is 39 and the other one is 41. The isotope of potassium that has atomic number 39 has the same number of Electrons and protons number of neutrons present in this isotope is 20.