Answer:
B: Jason's experiment
Explanation:
I did the Unit test review
Which of the following statements is
incorrect about heat and
temperature?
A device which make work easy it call
In which numbered position would a Period 4 element that is a metal with three valence electrons be located?
A) Position 13
B) Position 15
C) Position 20
D) Position 31
The position where a Period 4 element that is also a metal with three valence electrons would be located is: B) Position 15.
What is a periodic table?A periodic table can be defined as an organized tabular array of all the chemical elements, which is typically arranged in order of increasing atomic number or number of protons (in rows).
In Chemistry, a periodic table comprises seven (7) rows and eighteen (18) columns. Also, all chemical elements are arranged (grouped) on the periodic table based on their atomic number (number of protons).
In this context, the position where a Period 4 element that is also a metal with three valence electrons would be located is Position 15 on the periodic table.
Read more on periodic table here: https://brainly.com/question/18384230
Changes of state is an example of a chemical change.
CHANGES
OF STATE
True
False
31. What are the major groups of microrganisms?
32. Describe the characteristics of coke?
33. Give two example to show that plastics are non – corrosive in nature?
34. Define acid rain.
35. What is metamorphosis?
38. Define cataract.
Answer:
31.Microbial
32.Coke is a grey, hard, and porous fuel with a high carbon content and few impurities, made by heating coal or oil in the absence of air—a destructive distillation process. It is an important industrial product, used mainly in iron ore smelting, but also as a fuel in stoves and forges when air pollution is a concern.
33.examples to show that plastics are non corrosive in nature: Iron nails get rusted when exposed to moisture and air but plastic do not react with water and air. Plastic does not react with strong chemicals. Hence,cleansing chemicals are stored in plastic bottles and not in metal containers.
34.rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulfur and nitrogen oxides, which combine with atmospheric water to form acids.
35.in an insect or amphibian) the process of transformation from an immature form to an adult form in two or more distinct stages.
38.a medical condition in which the lens of the eye becomes progressively opaque, resulting in blurred vision.
Explanation:
Hope it helps!
If sodium (Na) is combined with Chlorine (CI), the compound would have which formula? A. Naci 0 O B. CINa C. ClaNa D. Na2C14
Answer: A.Naci
Explanation:
Table salt is made from a combination of atoms of sodium (Na) and chlorine (Cl) in a ratio of 1:1 forming the compound NaCl.
Which of these would you expect to have the highest boiling point?
Pertane: HOC-CH2-CH-CH2-CH)
Neopentane:
H.C-C-CH3
CH3
CH,
CHE
Isopentane:
Cyclopropane
НЕС-СН-СН-СН3
Нас
CHz
a) cyclopropane
b) pentane
c) isopentane
d) neopentane
Answer:
pertane the stronger the force the larger amount of energy needed to break of the connection between the molecules
Which of the statements below are TRUE, knowing what we know about forces and motion?
Choose ANY that are TRUE.
A. Objects at rest need a force to keep them at rest.
B. A net force causes objects to accelerate.
C. If forces acting on an object are balanced, the object can change its velocity.
D.Inertia means that an object will keep its same state of motion.
Mass and weight are the same thing and are both forces.
Answer:
b
Explanation:
if there is a net force acting on an object, the object will have an acceleration and the objects velocity will change
How does carbon cycle
Answer:
The carbon cycle describes the process in which carbon atoms continually travel from the atmosphere to the Earth and then back into the atmosphere. ... Carbon is released back into the atmosphere when organisms die, volcanoes erupt, fires blaze, fossil fuels are burned, and through a variety of other mechanisms.
hopefully that answered your question. brainliest would be appreciated. have a awesome day!
Answer:
evaporation or released from natural eruptions by nature
If the pOH of a solution is 13, what is the PH of the solution?
Answer: pH= 1
Explanation: pOH + pH =14
List 5 kinds of animals with backbone (Describe each of them)
List 8 kinds of animals without backbone (Describe each of them)
Vertebrates are animals with a backbone (think vertebrae). These are the creatures we usually think of when we think of animals. Vertebrates have tremendous diversity in shape, size, ability, and characteristics. They are truly wondrous creatures! The 5 classes of vertebrates are:
Fish, Amphibians, Reptiles, Mammals, and Birds.
All invertebrates obtain food differently, some have a mouth, and others have a beak. The eight different phyla are, Porifera, Cnidarians, Platyhelminthes, Nematoda, Annelida, Echinodermata, Mollusca, and Arthropoda.
Help me answer this chemistry question. thank you!
Answer:
A. How much decay happens in each flashlight
Explanation:
In an experiment, the DEPENDENT OR RESPONDING VARIABLE is the variable that responds to changes being made to another variable called Independent variable. It is the variable that is measured by an experimenter.
In this question, an experiment was carried out to research the effect of sunlight on plastic decay. Three plastic flashlights were used for this experiment in which one was placed in a dark closet (control), and the others were placed in light at different times or intervals. However, the variable being measured or assessed is the decay of each flashlight. This means that "HOW MUCH DECAY HAPPENS IN EACH FLASHLIGHT" is the dependent variable.
A walnut stuck to a pin is burned beneath a can containing 100.0 grams of water at 21°C. After the walnut has completely burned, the
water's final temperature is a warmer 28°C. How much heat energy arose from the burning walnut?
2,000 joules
3,000 joules
5,000 joules
O 9,000 joules
Answer:5000 i think
Explanation:
Cl2 + 2KBr -> Br2 + 2KCI
How many grams of Br2 can be produced from 356 g of KBr?
A. 2.99 g Br2
B. 1.50 g Br2
C. 9.10 g Br2
D. 239 g Br2
Answer: D. 239 g of [tex]Br_2[/tex]
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} KBr=\frac{356g}{119g/mol}=2.99moles[/tex]
The balanced chemical reaction is:
[tex]Cl_2+2KBr\rightarrow Br_2+2KCl[/tex]
According to stoichiometry :
2 moles of [tex]KBr[/tex] produce = 1 mole of [tex]Br_2[/tex]
Thus 2.99 moles of [tex]KBr[/tex] produce =[tex]\frac{1}{2}\times 2.99=1.495moles[/tex] of [tex]Br_2[/tex]
Mass of [tex]Br_2=moles\times {\text {Molar mass}}=1.495moles\times 159.8g/mol=239g[/tex]
Thus 239 g of [tex]Br_2[/tex] will be produced from 356 g of KBr.
How many grams of oxygen are required to react with 2.05 g
g
of dihydrogen sulfide?
Answer:
38 g
Explanation:
I think thats the answer in your question
1. A helium-filled balloon had a volume of 8.50 L on the ground at 20.0°C and a
pressure of 750.0 Torr. After the balloon was released, it rose to an altitude where the
temperature was 40.0°C and the pressure was .550 atm. What is the new volume of
the balloon in liters at the high altitude?
Answer:
133.74 L
Explanation:
First we convert the given pressures and temperatures into atm and K, respectively:
750.0 Torr ⇒ 750/760 = 0.9868 atm20°C ⇒ 20+273.16 = 293.16 K40°C ⇒ 40+273.16 = 313.16 KThen we use the PV=nRT formula to calculate the number of moles of helium in the balloon, using the data of when it was on the ground:
0.9868 atm * 8.50 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 293.16 Kn = 2.866 molThen, knowing the value of n, we use PV=nRT once again, this time to calculate V using the data of when the balloon was high up:
0.550 atm * V = 2.866 mol * 0.082 atm·L·mol⁻¹·K⁻¹ * 313.16 KV = 133.74 L(P) has two isotopes : P -31 and P - 32 . Let's say that the percent abundance of P - 31 is 75\% and for P-32 it is 25 %. What is the average atomic mass of phosphorus?
Answer: 2.3% :)
............................
Answer: 34%
Explanation:
Calculate the amount in grams in 0.52600 moles of vanadium.
Answer:
26.795229
Explanation:
This is how much it is
this is when an organism like insects or plants become trapped in amber
thats very nice lol, things stuck in amber are very cool
Many people wear reading glasses, which allow for better near vision.
What type of lenses are on these glasses?
Answer:
Convex
Explanation:
8 guess not sure cause light rays should be converging to meet to their eye
Explain how to use the displacement method to find the volume of an irregularly shaped object.
Answer:
Subtract the volume of the water alone from the volume of the water plus the object. For instance, if "b" was 50 milliliters and "a" was 25 milliliters, the volume of the irregularly shaped object would be 25 milliliters.
Explanation:
Hope it helps
What new characteristic did John Delton add to the model of the atom BRAINLY WHOEVER GETS IT RIGHT PLEASE IM ON A TIMER
Which of the following bonds has the greatest polarity?
P4
Br-Br
Te-F
CI-F
Bond polarity and ionic character go hand in hand: We can say that polarity and ionic character are positively correlated. The classical way to determine either is to compare the electronegativity difference (ΔEN) between the bonding atoms. The greater the difference in electronegativity, the larger the dipole moment, the greater the polarity, and the greater the ionic character of the bond.
The Pauling electronegativity scale, which should be provided in most chemistry texts and is certainly available online, can be used to determine ΔEN. As a very general rule of thumb, an ΔEN that is equal to 2.0 or greater indicates an ionic bond. We don't have to worry about that here, though, since we're only interested in polarity. But this is just some conceptual relation to consider; indeed, ionic bonds can be seen as very polar covalent bonds (or covalent bonds with significant ionic character).
There is no known bond that has a 100% ionic character (ΔEN = 4), i.e., a purely ionic bond. But there are many bonds that we know of with 0% ionic character (ΔEN = 0), i.e., a completely nonpolar bond. We can think about this logically without even knowing specific electronegativity values: If the difference in electronegativity between two bonding atoms is 0, then the two atoms must have equivalent electronegativities. And when can this be the case? Well, atoms from the same element have the same electronegativity. So one case of completely nonpolar bonding would be covalent bonding between atoms of the same element.
In the question given, there are two such cases: P4 and Br-Br. P4 is a tetrahedral molecule composed of four covalently bonded P atoms, each one bearing a lone electron pair and bonded to the other three. With each P having the same electronegativity (ΔEN = 0), no P-P bond in P4 has a dipole moment, and the P4 molecule itself is nonpolar. Br-Br is how bromine is found naturally (as diatomic Br₂); since this is a covalent bond between the atoms of the same element, the ΔEN = 0 and there is no dipole moment. A bromine molecule is completely nonpolar.
Fluorine (F) has the greatest electronegativity among the elements, so whether the Te-F or the Cl-F bond has the greater polarity (i.e., the greater ΔEN) really depends on the electronegativity of Te and Cl.
But let's think about this first. Both Cl and F are halogens; Cl is in the period right below F, and, following periodic trends, Cl itself is quite electronegative. Generally, nonmetals don't form ionic bonds with each other (the underlying reason is complicated and not relevant here, but that notion agrees with ΔEN between any two nonmetals being less than 2.0). Nonmetallic elements can form very polar covalent bonds whose ΔEN is very close to 2.0, however.
Tellurium (Te) is a metalloid that is three periods below F. Electronegativity generally decreases as you go down a group. Even though Te and Cl are not in the same group, the fact that Te is two periods below should give a strong presumption that Te has a lower electronegativity than Cl. Moreover, electronegativity increases you move left to right on the periodic table (that is, as the group number increases); Te is in a group to the left of fluorine's and chlorine's. So, using periodic trends alone, we know that Te is in a group to the left of and below that of Cl, both of which trend toward decreasing electronegativity. Thus, it would be reasonable to assume that Te would have a smaller electronegativity than Cl. And so, the ΔEN of Te-F > ΔEN of Cl-F, which means the Te-F bond should have the greater polarity. And, indeed, this is true using the Pauling scale: The EN of F is 4.0; the EN of Cl is 3.0; and the EN of Te is 2.1.
In all, given that the ΔEN of P-P = 0; ΔEN of Br-Br = 0; ΔEN of Te-F = 1.9; and ΔEN of Cl-F = 1.0; the Te-F bond has the greatest polarity.
what are three disadvantages of making and using plastic?
Reduction occurs at the cathode in
1.
electrolytic cells, onlysing
2.
voltaic cells, only
3.
both electrolytic cells and voltaic cells
4.
neither electrolytic cells nor voltaic cells
Answer: 3
Explanation:
3) both electrolytic cells and voltaic cells
The statement, that describes reduction occurs at the cathode is "both electrolytic cells and voltaic cells."
What is a reduction?The gain of electrons is referred to as reduction. The species that is being oxidised is also known as the reducing agent or reductant, whereas the species that is being reduced is known as the oxidising agent or oxidant.
Reduction takes place at the cathode electrode whereas oxidation occurs at the anode in both galvanic and electrolytic cells, and electrons travel from the anode to the cathode.
Electrons must move toward the location of reduction since reduction is the addition of electrons. The negative charge is on the cathode of an electrolytic cell, while the positive charge is on the anode.
Hence, the correct answer is 3.
Learn more about reduction here
https://brainly.com/question/13699873
#SPJ2
How many moles would be present in 300 liters of dinitrogen monoxide at
STP?
Answer: 13.4
Explanation: i guessed it and got it correct on ck-12
STP is the standard pressure and temperature condition of the ideal gas. 0.13 moles of dinitrogen monoxide will be present at STP.
What is the ideal gas equation?An ideal gas equation is a relation between the pressure, volume with moles, gas constant, and the temperature of the ideal gas. The ideal gas equation is given by,
[tex]\rm PV = nRT[/tex]
Given at STP,
Pressure = 1 atm
Volume = 300 L
Moles = ?
Gas constant =8.3144598 J per mol per Kelvin
Temperature = 273 K
Substituting values in the ideal gas equation we get:
[tex]\begin{aligned} \rm n &= \rm \dfrac{ PV}{RT}\\\\&= \dfrac{1 \times 300}{273 \times 8.314}\\\\&=0.1321\end{aligned}[/tex]
Therefore, 0.13 moles of dinitrogen monoxide are produced at STP.
Learn more about STP here:
https://brainly.com/question/15828565
Questions
1. Is the statement true that a gas takes on the shape of the container?
2. What happened to the water when it was poured into the glass? Into the square container?
3. Did the wood have a fixed shape?
4. Of what state of matter is water an example?
5. Of what state of matter is
ice an example?
6. Of what state of matter is steam an example?
This is for a project. Complete in complete sentences. Please. Sorry if this is confusing
Answer:
1. It will take the shape of its container. Particles can move about within a liquid, but they are packed densely enough that volume is maintained. Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume. A gas can be compressed
2. However after pouring the water from one short glass into a tall glass, to be the same amount after being poured into any other container
3. Yes, wood have a fixed shape. Explaination: The reason is that it's solid and solids have a definite volume and shape. ... They have shapes that do not change and volumes that can be measured
4. Water is known to exist in three different states; as a solid, liquid or gas. Clouds, snow, and rain are all made of up of some form of water. A cloud is comprised of tiny water droplets and/or ice crystals, a snowflake is an aggregate of many ice crystals, and rain is just liquid water
5. Solids are sometimes formed when liquids or gases are cooled; ice is an example of a cooled liquid which has become solid. Other examples of solids include wood, metal, and rock at room temperature
6. For example, water commonly exists in three states of matter: solid (ice), liquid (water), and gas (steam)
Explanation:
plzzzzzzzzzzzzzz give brainly
1. It will adopt its container's shape. Within a liquid, particles can move around, yet the volume is maintained because of the liquid's dense packing. Particles in gaseous stuff are arranged so haphazardly that neither their shape nor their volume can be determined.
What is liquid ?The term liquid is defined as substance which is not solid but which flows and can be poured and take a shape of container. water is an example of liquid.
2. However, the same amount of water would be poured into any other container after being transferred from one short glass to a tall glass.
3. The shape of wood is fixed. It's solid, and solids have a distinct volume and shape, which explains why. They have measurements-able volumes and unchanging forms.
4. There are three recognized states of water: solid, liquid, and gas. Snow, rain, and clouds are all composed of water in some way. A snowflake is an accumulation of several ice crystals, a cloud is made up of microscopic water droplets and/or ice crystals, and rain is just liquid water.
5. When liquids or gases are chilled, solids can occasionally form; ice is an example of a cooled liquid that has solidified. At room temperature, solids also include wood, metal, and rock.
6. As an illustration, water typically exists in three states: solid (ice), liquid (water), and gas (steam).
Thus, to learn more about liquid, follow the link;
https://brainly.com/question/20922015
#SPJ2
2. Which of these items would allow one scientist to reproduce the experiment of another scientist.
A.
B.
a strong hypothesis
a detailed scientific Journal
well-drawn graphs of the data
a complete list of all materials used
C.
D.
Answer:
answer us A I hope it helps u
Enter your answer in the provided box.
A gas initially at 5.48 L, 1.34 atm, and 61 °C undergoes a change so that its final volume and temperature are 1.32 L and 31 °C. What is its final pressure? Assume the number of moles remains unchanged.
atm
Answer:
5.06atm
Explanation:
Using the combined gas law equation;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (Litres)
V2 = final volume (Litres)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
P1 = 1.34 atm
P2 = ?
V1 = 5.48 L
V2 = 1.32 L
T1 = 61 °C = 61 + 273 = 334K
T2 = 31 °C = 31 + 273 = 304K
Using P1V1/T1 = P2V2/T2
1.34 × 5.48/334 = P2 × 1.32/304
7.34/334 = 1.32P2/304
Cross multiply
334 × 1.32P2 = 304 × 7.34
440.88P2 = 2231.36
P2 = 2231.36/440.88
P2 = 5.06
The final pressure is 5.06atm
The rabbit in this food web would be considered a
Answer:primary consumer
Explanation:
i got it right