Hello! Everyone:) I was just wondering if you can help me with my test.
Points: 99
Answer:
By their properties ;)
Explanation:
[tex]\Large \boxed{\sf by \ their \ properties}[/tex]
Every element has a set of particular characteristics. Each has a unique atomic and mass number because they contain a different ratio of protons and neutrons. The number of protons in an element mirrors the element's atomic number. The mass number equals the sum of the element's protons and neutrons.
According to increasing atomic numbers, chemical elements get organized. Periods and groups are the names of the horizontal rows and vertical columns, respectively. The chemical characteristics of elements within the same group are comparable due to their similar valency and number of outer electrons.
Is a graph that starts at 25 and drops to 21, stays the same in temperature an endothermic reaction or an exothermic reaction?
Answer:
Explanation:
Endo and Exo thermic are defined by what changes take place in the environment of the reaction.
If the temperature goes up, the reaction is giving up heat. It is Exothermic.
If the temperature goes down, the reaction requires heat. It is Endothermic.
In this case, the temperature went down. The reaction is Endothermic.
Help me with my Science, Part 1 and 2 please this has to be done by tomorrow
Answer:
Part 1: Condensation is when - a
Condensation happens when- water vapour suddenly freezes
Part 2: Water, condenses, vapour, cold, droplets, Condensation
A solution is prepared by dissolving 15.0 g of table salt in 70.0g of water. Find(a) the mass percent of solute and (b) the mass percent of solvent.
Answer:
[(15g NaCl/(70+15)]*100 = % NaCl
{(70g H2O/(70+15)]*100 = % H2O
Explanation:
A solution is prepared by dissolving 15.0 g of table salt in 70.0g of water. (a) The mass percent of solute is 17.64 % and (b) The mass percent of solvent is 82.35 %.
How to calculate the Mass percent of solute ?Mass percentage = [tex]\frac{\text{Mass of solute}}{\text{Mass of solute + Mass of solvent}}[/tex] × 100
How to calculate the Mass percent of solvent ?Mass percentage = [tex]\frac{\text{Mass of solvent}}{\text{Mass of solute + Mass of solvent}}[/tex] × 100
Here,
Mass of solute (table salt) = 15.0 g
Mass of solvent (water) = 70.0 g
(a) The mass percent of solute
Put the value in above formula we get
Mass percentage = [tex]\frac{\text{Mass of solute}}{\text{Mass of solute + Mass of solvent}}[/tex] × 100
= [tex]\frac{15}{15 + 70}[/tex] × 100
= [tex]\frac{15}{85}[/tex] × 100
= 17.64 %
(b) The mass percent of solvent
Mass percentage = [tex]\frac{\text{Mass of solvent}}{\text{Mass of solute + Mass of solvent}}[/tex] × 100
= [tex]\frac{70}{15 + 70} \times 100[/tex]
= [tex]\frac{70}{85} \times 100[/tex]
= 82.35 %
Thus, we can say that (a) The mass percent of solute is 17.64 % and (b) The mass percent of solvent is 82.35 %.
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How many neutrons are in K-37?
Answer:
is this physics
pls check your questions and try again
Enter the correct ground-state (or lowest energy) configuration based on the number of electrons: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10.
Answer:
FIGURE 5.9 The arrow shows a second way of remembering the order in which sublevels fill. Table 5.2 shows the electron configurations of the elements with atomic numbers 1 through 18.
Element Atomic number Electron configuration
sulfur 16 1s22s22p63s23p4
chlorine 17 1s22s22p63s23p5
argon 18 1s22s22p63s23p6
Explanation:
Brainlilest me
How many grams of water are needed to absorb 456 J if its temperature goes from 22.7 to 98.3 Celsius?
The mass of water needed to absorb 456 J is 1.44 g
We'll begin by calculating the change in the temperature of the water.
Initial temperature of water (T₁) = 22.7 °C
Final temperature (T₂) = 98.3 °C
Change in temperature (ΔT) =?ΔT = T₂ – T₁
ΔT = 98.3 – 22.7
ΔT = 75.6 °CFinally, we shall determine the mass of the waterHeat absorbed (Q) = 456 J
Change in temperature (ΔT) = 75.6 °C
Specific heat capacity of water (C) = 4.184 J/gºC
Mass of water (M) =?Q = MCΔT
456 = M × 4.184 × 75.6
456 = M × 316.3104
Divide both side by 316.3104
M = 456 / 316.3104
M = 1.44 gTherefore, the mass of the water is 1.44 g
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What is the total amount of work done when Danny lifted 25 pounds of weight over 5 meters and applying 30- Newtons of Force?
Answer:
Definition and Mathematics of Work
Calculating the Amount of Work Done by Forces
Potential Energy
Kinetic Energy
Mechanical Energy
Which of the following is the correct chemical symbol for Aluminium?
A: AL
B: Al
C: aL
D: al
What effect do shiny metals have on radiant energy?
Answer: Metals conduct heat and reduce the kinetic energy within the components that need to remain cool.
Explanation:
Pls fast pls due today pls pls I don’t wanna fail
Answer:
2:true
3: true
4:false
5: true
Explanation:
Does this aid in joining the two molecules?
Answer:
yes it does aid in joining the two molecules
Explanation:
a.
Which of the following statements about empirical formulas is incorrect?
An empirical formula represents a molecule.
b. An empirical formula gives the smallest whole number ratio of each type of atom
in a molecule.
c. An empirical formula must be multiplied by an integer to obtain the molecular
formula.
d. The molecular formula can be the same as the empirical formula in some-
situations.
e.
All statements are correct.
Answer:
A
Explanation:
The empirical formula won't always represent a molecule if the molecular formula is not the smallest ratio between elements.
metallic bonding in a group three metal
Answer: In a pure metal, there are atoms that are surrounded by free moving valence electrons in which they move from one part of metal to another part . There for we can conclude that pure metals are held together by things called metallic bonds and due to attraction between the mobile valence electrons and the positively charged metal ions.
Explanation:
The ability to be drawn into thin sheet is called malleability. The ability to be drawn into thin wires is called ductility. Therefore, the metallic bonds is between metals and metals.
What is metallic bonding?Metallic bonding is a type of chemical bonding that rises from the electrostatic attractive force between conduction electrons and positively charged metal ions.
Covalent bonds are not strong bond. They can not have malleability and ductility. Ionic bonds are very strong bond. These are too not malleable or ductile. Lewis structure is used to show valence electron of every element in a molecule so, it has nothing to do with malleability and ductility. Due to metallic bonding, there is high melting and boiling point.
Therefore, the metallic bonds is between metals and metals.
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Please Help Will Mark Brainliest!!!
Liquid water can be separated into hydrogen gas and oxygen gas through electrolysis. 1 mole of hydrogen gas and 0.5 moles of oxygen gas is produced from 1 mole of liquid water collected in separate 10 L containers at 1 atm. Will the temperatures of the gases be equal? In one to two sentences, use the ideal gas law to explain your answer. (20 points)
Answer:
The ideal gas law specifies the mechanical behavior of ideal gases. It is capable of calculating the volume of gases produced or consumed.
In chemical equations, these equations are widely used to convert between volumes and molar quantities.
Use ideal gas law
Therefore
is the same for both So, = same for both.
When n increases, T decreases, so, n is 1 for and 0.5 for , implying that is hotter.
The temperatures of the gases will not be equal.
The ideal gas law specifies the mechanical behavior of ideal gases. It is capable of calculating the volume of gases produced or consumed. In chemical equations, this equation is widely used to convert between volumes and molar quantities. The ideal gas law states that the pressure, temperature, and volume of gas are related to each other[tex]PV=nRT[/tex]
∵V is the same for both
∴T= same for both.
When n increases, T decreases, so, n is 1 for hydrogen gas and 0.5 for oxygen gas ,implying that oxygen gas will have more temperature than hydrogen gas since its number of moles are lower than hydrogen gas.
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Whats the best red waterproof lipstick? Need some help :)
[tex][tex]\blue{\rule{40pt}{900000000pt}}[/tex][/tex]
What is the number of atoms of oxygen in 0.1 mol of CuSO4.5H2O? & explain
002 (part 1 of 2) 10.0 points
1.5 mol HCl and 3.7 mol NaOH react accord-
ing to the equation
HCl + NaOH → NaCl + H2O.
If the limiting reactant is HCl, calculate the
amount of NaCl formed.
1. 1.9
2. 2
3. 1.1
4. 1.5
5. 1
6. 1.8
7. 1.2
8. 1.3
9. 1.4
10. 1.7
Answer in units of mol.
mol,
Answer:
4) 1.5 mol
Explanation:
Well, the equation is already balanced and the mole to mole ratio of reactants and products are all 1. So if the limiting reactant is HCl and you have 1.5 mol, you do the mole to mole ratio with NaCl and since it is 1 to 1, there'd be 1.5 mol of NaCl.
How many elements are present in the compound Na_2S_2O_3
Answer:
3 elements are present in thr compound
Which statement best describes mechanical energy?
the energy of electricity and motion
the energy of heat and magnetism
the energy of electricity and heat
the energy of moving parts and motion
Answer:
The energy of moving parts and motion
Explanation:
Mechanical energy doesn't have change in temperature or heat, so electricity and heat would be cancelled out. Mechanical energy is more about motion.
1) Which of the following is true about Earth’s plates?
a. Earth’s plates are separated by oceans.
b. Earth’s plates are piled on top of one another within the Earth.
c. Earth’s plates fit closely together with the edges of the plates touching each other.
d. Earth’s plates are surrounded by melted rock and do not touch each other.
Answer:
a because the others whould cause earthquakes
Explanation:
Answer:
A
Explanation:
because i think is A (if is not im sorry )
Which of the following is the correct way to do it for 3753 Scientific notation
Answer:
b
Explanation:
it is b because it has 4 spots and that would be 3 zeros so it is to the 3rd power
PLEASE HELP WILL AMRK BRAINLIEST
what is the atomic mass of Na3PO4?
Answer:
163.94
Explanation:
Na = 22.99 (3)
P = 30.97
O = 16.00 (4)
22.99(3) + 30.97 +16.00(4) = 163.94
Hope that helps
What equation explains the relation between amperes, watts and volts?
I = W-V
I = W+V
I = W/V
I = W*V
Answer:
I = W/V
Explanation:
Comes from the Equation P=I*V where P is Power measured in Watts, I is Current measured in Amps and V is Voltage measured in Volts.
Which of the following are needed for an electrical circuit? Choose all that apply
A.A mental conductor for electrons to pass through
B.light bulb
C.two negative ends to a battery
D.closed loop
E.charged battery to provide an electrical difference
Answer:
E\charged battery to provide electronic difference
A group of scientists are studying observable matter in a cluster of galaxies. They conclude that the cluster has only a small percentage of the mass required to keep it from
flying apart. Why does the duster remain intact?
Answer:
it is because of Dark Matter
Dark Matter, component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. Dark matter makes up 30.1 percent of the matter-energy composition of the universe; the rest is dark energy (69.4 percent) and “ordinary” visible matter (0.5 percent).
Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly.
Explanation:
Hope It helps
Have A Nice Day : )
A group of scientists is studying observable matter in a cluster of galaxies. The duster remains intact due to the gravitational pull.
What is a galaxy?A galaxy is a collection of stars, stellar remains, interstellar gas, dust, and dark matter that are gravitationally bonded together.
Dark matter is a component of the universe whose gravitational pull can be detected rather than its luminosity. The universe's matter-energy ratio is made up of 30.1 percent dark matter, 69.4 percent dark energy, and “regular” visible matter (0.5 percent).
Since dark matter is made up of particles that do not absorb, reflect, or emit light, it is impossible to identify it through electromagnetic radiation observation. Dark matter is a substance that cannot be directly observed.
Therefore, a team of researchers is examining the material that can be seen in a clump of galaxies. Due to the gravitational force, the duster is unharmed.
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Which of the following methods will usually cause a reaction to speed up?
Group of answer choices
Removing the catalyst.
Combining the reactants at a lower temperature.
Grinding one of the reactants into a powder.
Reducing the concentration of reactants.
the method that will usually cause a reaction to speed up from the list given is: Reducing the concentration of reactants.
Meaning of ReactionReaction can be defined as the combination of substances or a process where substances acts on each other, where substances changes into different substances.
A reaction can be said to be the event that causes a restructuring or rearrangement of atoms of a substance when it is in contact with another substance.
In conclusion, the method that will usually cause a reaction to speed up from the list given is Reducing the concentration of reactants.
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Consider the reaction below. Upper C upper C l subscript 5 (g) double-headed arrow upper P upper C l subscript 3 (g) plus upper C l subscript 2 (g). At 500 K, the reaction is at equilibrium with the following concentrations. [PCI5]= 0. 0095 M [PCI3] = 0. 020 [CI2] = 0. 020 M What is the equilibrium constant for the given reaction? 0. 042 0. 42 2. 4 24.
The equilibrium constant of the reaction is 0.042.
The reaction equation is given as;
PCl5(g) ⇄ PCl3(g) + Cl2 (g)
Recall that this equation shows the decomposition of phosphorus pentachloride.
We have the following equilibrium concentrations;
[PCI5]= 0.0095 M
[PCI3] = 0.020
[CI2] = 0.020 M
The equilibrium constant, K is obtained from;
K = [PCI3] [CI2]/[PCI5]
K = [0.020]^2/[0.0095]
K = 0.042
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Which procedures were followed in this lab to decrease experimental error? Check all that apply.
using only two types of seeds, both from the same source
having one student count every sprout in every quadrat
using adjacent plots of land for both groups
increasing the sample size by combining data from multiple groups
repeating the experiment indoors under growth lights
measuring plant height the same way and at the same time for both groups
Answer:
Basically A, C, D, F
Explanation:
Summarizing the answer
Using only two types of seeds, both from the same source.
What are experimental error?Experimental error refers to the uncertainties or mistakes that can occur during scientific experiments, leading to inaccuracies in the results. These errors can arise due to a variety of reasons, such as human error, instrumental error, environmental factors, and methodological issues. The presence of experimental error can make it difficult to draw accurate conclusions from the data obtained during an experiment.
Scientists use various procedures to reduce experimental error and improve the accuracy and reliability of their results. These procedures can include:
using adjacent plots of land for both groupsincreasing the sample size by combining data from multiple groupsmeasuring plant height the same way and at the same time for both groups.Learn more about experimental error, here:
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Whats the different between chemical property and chemical change, and physical property and physical change?
Answer:
I think the answer is A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
Explanation:
I hope this helps.
Answer:
Physical change is the same substance, while a chemical change is a new substance.