Answer:
The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.
Explanation:
Why do we buy milk by the gallon and a bottle of coke by the liter?
Answer:
In 70s we were not much familiar with coca cola. Pepsi were sold in liter and milk is traditionally sold locally sold in gallon.
Explanation:
Sarah Brew said that unlike to the global brand like coca cola, Pepsi are sold at global level but milk is sold at local level follow the local custom measurement. If we look back in history, the milkman sold milk door to door in the form of quartz and the gallons. Same things consumers expected from seller.
These are two ways that play a role in grocery shopping. That's why the congress make a product list in form of liter and metric and traditional inches , gallons, pounds, milk etc.
One method of rating complexity in scientific disciplines is with respect to the number of variables that are involved in experiments. Using this method, which of the following disciplines is the most complex?
a. Mathematics,
b. Anatomy,
c. Chemistry,
d. Sociology
Answer:
a. Mathematics
Explanation:
There are various scientific studies and their complexity is different from each other. The one study might be difficult for one student but the other student who has interest in the particular subject might find it easy and interesting. Mathematics is the study which involves lot of variables which increase its level of complexity. The scientist may stuck in solution for years due the complexity of the multiple variables.
Atoms of Group 6 of the Periodic Table are most likely to form ions with
How much heat is absorbed by 20g granite boulder as energy from the sun causes its temperature to change from 10°C to 29°C? The specific heat capacity of granite is 0.79 J/gºC.
Given :
Mass of granite , m = 20 g .
Change in temperature , [tex]\Delta T=29-10=19^oC[/tex].
Specific heat capacity of granite , [tex]C=0.79\ J/g^oC[/tex] .
To Find :
The heat absorbed by granite .
Solution :
We know , heat absorb is given by :
[tex]\Delta H=mC\Delta T\\\\\Delta H=20\times 0.79 \times 19 \ J\\\\\Delta H=300.2\ J[/tex]
Therefore , heat absorb is 300.2 J .
Hence , this is the required solution .
Taking into account the definition of calorimetry, the heat absorbed is 300.2 J.
In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat exchanged by a body without affecting its molecular structure. If you don't change the molecular structure, you don't change the state of aggregation. Since the molecular structure does not change, a change in temperature is observed.
In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case:
Q= ? c= 0.79[tex]\frac{J}{gC}[/tex] m= 20 g ΔT= Tfinal - Tinitial= 29 C - 10 C= 19 CReplacing in the expression to calculate heat exchanges:
Q= 0.79[tex]\frac{J}{gC}[/tex]× 20 g× 19 C
Solving:
Q= 300.2 J
In summary, the heat absorbed is 300.2 J.
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Answer:
7) Example: Gravitational force
Gravitational force, also known as gravity, is a type of non- contact force.
10) Unbalanced forces can cause an object to accelerate, make a stationary object move, or cause a moving object to stop.
12) Gravitational force, Frictional force, Magnetic force
13) Friction is beneficial when we are walking as it prevents us from slipping.
For the table, find the net force first and that would help us to find the direction and the type of force (balanced/ unbalanced).
As written in Q11, add all the forces together to determine the net force acting on an object. More specifically, add the forces that act in one direction together. Then subtract the forces acting in the other direction.
Let's look at the teddy bear (Q14 -16):
Take note that we have to look at the direction of the arrow not which side the arrow is on (left/ right of the bear).
Total force acting towards the left
= 16 +7
= 23N
Total force acting on the right= 22N
Net force
= 23 -22
= 1N towards the left
Thus, 14) Unbalanced (since the net force is not 0N)
15) 1N
15) 1N16) left
Vase question:
Total downward force
= 11 +33
= 44N
Total upward force
= 25 +19
= 44N
Net force= 0N
17) Balanced
17) Balanced18) 0N
17) Balanced18) 0N19) No direction
Bicycle question:
Total force acting towards the right
= 65 +115
= 180N
Total force to the left= 170N
Net force
= 180 -170
= 10N to the right
20) Unbalanced
20) Unbalanced21) 10N
20) Unbalanced21) 10N22) To the right
Christina weighs 119 lbs. What is her mass in grams?
Answer:
53977.5g
Explanation:
1lb = 2.205
119 ×[tex]\frac{1lbs}{2.205kg} = 53.9775[/tex]×[tex]\frac{1000g}{1kg}[/tex] = 53977.5g
Tony tuns on a fan on when his room becomes uncomfortably hot. The fan is an example of?
A-Electrical Energy changed into heat energy
B-Mechanical energy being changed into electrical energy
C-Electrical energy changed into mechanical energy
D-Heat energy being changed into electrical energy
Please answer im in a rush
Answer:
C-Electrical energy changed into mechanical energy
Explanation:
Energy, according to the law of conservation of energy, is said to neither be created or lost but only interchangeable from one form to another. Energy exists in different forms. The process by which one form of energy changes to another is called TRANSFORMATION of energy.
However, certain household appliances or devices bring about this transformation of energy. For example, in a case where Tony turns a fan on when his room becomes uncomfortably hot. The fan uses an electric source to get powered on, which then facilitates the blades of the fan to move fast in order to bring about a cool atmosphere.
The fan converts ELECTRICAL energy (electric source) into MECHANICAL energy (moving energy).
At what temperature would one mole of molecular nitrogen (N_2) have 7.0 × 10^3 J of translational kinetic energy (total internal energy)? Note: the atomic mass of N is 14 g/mol.
Answer:
T = 561.3K
Explanation:
The translational kinetic energy of a gas such as nitrogen is obtained using the formula:
K = 3/2 * n * R * T
Where n are moles of gases (1mole of N₂), R is gas constant (8.314J/molK)and T is absolute temperature (in K)
If the translational energy of the gas is 7.0x10³J:
7.0x10³J = 3/2 * 1 mole * 8.314J/molK * T
T = 561.3KElla holds an ice cream cone in her hand. She soon notices that her hand begins to feel cold. Which claim explains what is different about the particles that make up her hand?
Answer:
what's different about the particles in her hand are that for one are a solid in contrast to the ice cream which is partially liquid.
______is used in production of hard disk. 1 platinum 2 silver 3 gold
Answer:
platinum
Explanation:
the film on a hard drive platter contains platinum
Why is it important to collect all data during experiments, rather than make inferences of what will happen?
Answer:
It is important to collect all data first, or else your guesses could purely be the opposite of the right answer. If you make inferences of what might happen, your guesses may be purely fictional, and totally off-topic. During experiments, this step is important.
Convert 23 kg to ounces (2.2 lbs = 1 kg) (1 lb = 16 ounces)
Answer:
23 kgs = 809.6 ounces
Explanation:
given:
1 kg = 2.2 ibs
therefore, 23 kgs = 2.2*23 Ibs = 50.6 Ibs
since, 1 Ib = 16 ounces
therefore, 23 kgs = 50.6*16 ounces = 809.6 ounces
A centimeter and milimeter differ from each other by a factor of _____?
Answer:
10
Explanation:
a centimeter and a milimeter differ from each other by a factor of 10
Answer: 10
Explanation:
Consider the electron configuration. A box holds an up and a down arrow. A box holds an up and a down arrow. A box holds an up and a down arrow.A box holds an up and a down arrow.A box holds an up and a down arrow. A box holds an up and a down arrow. A box holds an up and a down arrow.A box holds an up and a down arrow.A box holds an up arrow. 1s 2s 2p 3s 3p Which element has this electron configuration?
Answer:
The Argon ([tex]Ar[/tex]) has this electron configuration.
Explanation:
The question is wrong. The correct electron configuration is :
[tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}[/tex]
The electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
The letters s,p,d and f are called the orbitals.
The numbers 1,2,3,4,5,6 and 7 are called the levels.
The maximum numbers of electrons that the s-orbital can hold is 2 electrons.
The maximum numbers of electrons that the p-orbital can hold is 6 electrons.
The maximum numbers of electrons that the d-orbital can hold is 10 electrons.
The maximum numbers of electrons that the f-orbital can hold is 14 electrons.
The order in which the orbitals are filled is :
1s-2s-2p-3s-3p-4s-3d-4p-5s-4d-5p-6s-4f-5d-6p-7s-5f-6d-7p-6f-7d-7f
To identify the electron configuration of an element we need to count and sum the exponents of its orbitals.
The electron configuration is :
[tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}[/tex]
Has the following sum of exponents : [tex]2+2+6+2+6=18[/tex]
Therefore the total electrons of the element is 18 electrons.
The element that has 18 electrons is Argon ([tex]Ar[/tex])
Answer:
C) chlorine
Explanation:
edge 2023
Q: A wind-up toy that is wound up but not moving...
(drag the check on one)
does not have energy.
has potential energy.
has kinetic energy.
a has both kinetic and potential energy.
Answer:
The correct option is;
Has potential energy
Explanation:
The total mechanical energy of a mechanical toy is given as follows;
Total Mechanical Energy = Kinetic Energy + Potential Energy
During the winding up of the coil, the total energy becomes the kinetic energy
The total energy at the point of winding up of the coil = The kinetic energy supplied to the toy by winding the coil
From the first law of thermodynamics, energy cannot be created nor destroyed but can be changed from one form to another
Due to the coil being prevented from unwinding, the kinetic energy becomes transformed (stored as) into Potential energy of the toy
When the toy is operated it then unwinds the coil bringing about motion and converting back the potential energy to kinetic energy by itself as if it was alive.
Organisms can be grouped according to how similar they are to one
another.Which list correctly shows the categories for sorting organisms
from the largest group to the smallest group? *
Answer:
Kingdom, phylum, class, order, family, genus, and species
Explanation:
Kingdom, phylum, class, order, family, genus, and species are the list used to classify organisms on the basis of similarities and differences. The largest group of classification is kingdom while the smallest group is the species. In each category, the organisms which are present are similar to each other while different from one another in some characteristics.
How many significant figures are in 31400
Answer: The Answer Is 3!
You titrate 5.0 mL of HCl with 0.010 M NaOH. You find the end point of your titration occurs when 12.0 mL of NaOH has been added. What is the total volume of the solution at the end point of the titration
Answer:
The total volume of the solution at the end point of the titration is 17.0 mL
Explanation:
First we will write a balanced chemical equation for the reaction between HCl and NaOH.
HCl + NaOH → NaCl + H₂O
This means 1 mole of HCl will react with 1 mole of NaOH to give 1 mole of NaCl and 1 mole of H₂O
From the question,
Concentration of acid (HCl), [tex]C_{A}[/tex] = ??
Volume of acid (HCl), [tex]V_{A}[/tex] = 5.0 mL
Concentration pf base (NaOH), [tex]C_{B}[/tex] = 0.010 M
Volume of base (NaOH), [tex]V_{B}[/tex] = 12.0 mL
To determine the Concentration of acid, [tex]C_{A}[/tex]
From,
[tex]\frac{C_{A}V_{A} }{C_{B}V_{B} } = \frac{n_{A} }{n_{B} }[/tex]
Where [tex]n_{A}[/tex] is the mole ratio of acid
and [tex]n_{B}[/tex] is the mole ratio of base.
The concentration of the acid used can be determined from the above formula.
But, we are asked to find the total volume of the solution at the end point of the titration
The total volume of the solution will be the sum of the volume of HCl that reacted and volume of NaOH that reacted.
Hence, The total volume of the solution = [tex]V_{A} + V_{B}[/tex]
= 5.0 mL + 12.0 mL
= 17.0 mL
Hence, the total volume of the solution at the end point of the titration is 17.0 mL
gold is heavier than aluminium if we put a 100 gram biscuit of gold in water taken in a measuring cylinder or we put a 100 gram aluminium bar in the measuring cylinder will the rise in the level of the water be same or different in the two cases give reason
Answer:
The level of the water will be higher for 100g Al because occupy more space than gold.
Explanation:
To understand this problem, we must know Archimedes' principle:
"A body that is submerged in a fluid produce a bouyant force equal to the weight of the fluid that the body displaces". The volume of the body is equal to the volume displaced in the liquid.
Now, as gold is heavier than aluminium, 100g of Al have more volume than 100g of gold, than means:
The level of the water will be higher for 100g Al because occupy more space than gold.A sample of marble has a volume of 6 cm3 and a density of 2.76 g/cm3. What is its mass?
Answer:
16.56g
Explanation:
6*2.76=16.56...
Answer:
16.56 grams
Explanation:
The density can be found using the following formula:
[tex]d=\frac{m}{v}[/tex]
If we rearrange the formula for m, the mass, we should multiply both sides by v.
[tex]d*v=\frac{m}{v} *v[/tex]
[tex]d*v=m[/tex]
The mass can be found by multiplying the density and the volume. The density is 2.76 grams per cubic centimeter. The volume is 6 cubic centimeters.
[tex]d= 2.76 g/c^3\\v=6 cm^3[/tex]
Substitute the values into the formula.
[tex]m= d*v[/tex]
[tex]m= 2.76 g/cm^3 * 6 cm^3[/tex]
Multiply. When you multiply the 2 "cm^3" will cancel each other out.
[tex]m= 2.76 g* 6[/tex]
[tex]m= 16.56 g[/tex]
The mass of the marble is 16.56 grams.
Menthol the substance we can smell in mentholated cough drops is composed of carbon, hydrogen and oxygen. A 0.1005 grams sample of menthol is combusted, producing 0.2829 grams of carbon dioxide and 0.1159 grams of water. What is the empirical formula for menthol? If the compound has a molar mass of 156 g/mol, what is its molecular formula?
Answer:
Empirical and molecular formula are both C₁₀H₂₀O
Explanation:
The formula of menthol is CₐHₓOₙ. In the problem we need to find a, x and n.
The combustion of menthol occurs as follows:
CₐHₓOₙ + O₂ → aCO₂ + 1/2 H₂O
That means moles of carbon dioxide are equal to moles of carbon in menthol and moles of hydrogen are twice moles of water.
Moles CO₂ and mass C:
0.2829g CO₂ * (1mol / 44g) = 6.4295x10⁻³ moles CO₂ = Moles C * 12.01 = 0.0772g C
0.1159g H₂O * (1mol / 18g) = 6.4389x10⁻³ moles H₂O * 2 = 0.01288 moles H * 1.0g/mol = 0.01288g H
That means mass of O in the sample is:
Mass O = 0.1005g - 0.0772g C - 0.01288g H = 0.01042g O * (1mol / 16g) = 6.51x10⁻⁴ moles O
Empirical formula is the simplest whole number ratio of moles of each element present in a compound. Dividing each number of moles in moles O (The smaller number of moles):
H = 0.01288 moles H / 6.51x10⁻⁴ moles O = 19.8 ≈ 20
C = 6.4295x10⁻³ moles C / 6.51x10⁻⁴ moles O = 9.9 ≈ 10
O = 6.64x10⁻⁴ moles O / 6.51x10⁻⁴ moles O = 1
That means empirical formula is:
C₁₀H₂₀OAs molar mass of this empirical formula is:
10*12g/mol + 20*1g/mol + 1*16g/mol = 156g/mol = Molar mass of the compound,
Molecular formula is also C₁₀H₂₀O
Can someone find the independent variable and the dependent variable ? :)))
Answer: Dependant variable = The distance it takes for each car to stop. Independent variable = Both cars go at 60 mph.
Explanation:
This is right because the dependant variable changes and the independent variable is the outcome of the dependant variable.
Which statement is not correct?
A: Energy is released when a liquid changes into a solid.
B: Particles move faster in the gaseous state than in the liquid state.
C: The carbon atoms in gaseous methane are further apart than those in solid diamond.
D: There is a large decrease in the volume of a solid metal when pressure is applied to it.
Answer:
D
Explanation:
If we put pressure on a solid or a liquid, there is essentially no change in volume.
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the incorrect statement is option D that is there is a large decrease in the volume of a solid metal when pressure is applied to it.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter. When we apply pressure on solid, then there is no change in volume of the solid matter.
Therefore, the incorrect statement is option D that is there is a large decrease in the volume of a solid metal when pressure is applied to it.
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If 6.02*10^23 molecules of ammonia react with 12.04*10^23 molecules of hydrogen chloride, how many molecules are in the reaction vessel when the reaction is complete
Answer:
18.06 × 10²³ molecules
Explanation:
Add the two amounts of molecules together.
6.02 × 10²³ + 12.04 × 10²³ = 18.06 × 10²³
You will have 18.06 × 10²³ molecules in the vessel when the reaction is complete. This is because of the Law of Conservation of Mass. Mass is neither created nor destroyed in chemical reactions. You will have the exact number of molecules in the reaction vessel as you did in the beginning. The types of molecules may change, but the number will stay the same.
Who Ever answers get 30 points (please no guessing)
Signals from _______ and the body's _______ are received by the brain and the spinal cord.
Answer:
Organs and senses.
Explanation:
The central nervous system includes the brain and spinal cord.
Your internal organs and your senses send signals to your brain and spinal cord.
What does control group mean
which of the following questions can be answered by science?
Answer:Is Fruit ripening dependent on the type of light exposed to?
Explanation: Because you can test this theory
Steve is performing a titration, where a base is at an unknown concentration. What should he choose as his indicator solution?Steve is performing a titration, where a base is at an unknown concentration. What should he choose as his indicator solution?
Answer:
D
Explanation:
Answer:
D) A chemical that's clear when basic and turns color when acidic is correct!
Explanation:
I got it right on a test!
Hope this Helps!! :))
The carbon _____________________combines chemically with oxygen and hydrogen to form a _________________________known as sugar. When making syrup, the sugar is dissolved in water to make a_________________________ . Before the sugar and water are mixed, the _______________________________mixture is not the same sweetness throughout. After mixing, the solution____________________________ is because when sugar is evenly disbursed throughout the water. Finally, the water is slowly boiled off and the solution slowly becomes sticky and gooey because the______________________ has increased and the solution now resists flowing.
Compound, Element ,Heterogeneous ,Homogeneous, Mixture ,Viscosity
The carbon element combines chemically with oxygen and hydrogen to form a compound known as sugar. When making syrup, the sugar is dissolved in water to make a mixture . Before the sugar and water are mixed, the heterogenous mixture is not the same sweetness throughout. After mixing, the solution homogenous is because when sugar is evenly disbursed throughout the water. Finally, the water is slowly boiled off and the solution slowly becomes sticky and gooey because the viscosity has increased and the solution now resists flowing.
What do you mean the solution ?A solution is a homogeneous mixture of two or more substances. A solution may exist in any phase. A solution consists of a solute and a solvent.
For the solutions, with components in the same phase, the substances present in lower concentration are solutes, while the substance present in higher concentration is the solvent.
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Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct?
They both have seven protons in the nucleus.
They both have the same mass number
They both have seven neutrons in the nucleus.
They both have the same atomic number.
Carbon-12 and carbon-13 are isotopes of carbon as both have same atomic number. The correct option is D.
What is an isotope?Isotopes are members of an element family that possess the identical number of protons but differ in their numbers of neutrons.
The atomic number of an element on the Periodic Table is determined by the number of protons in its nucleus. Carbon, for illustration, has six protons and therefore the atomic number is 6.
The three share the position in the periodic table assigned to atomic number 1 and are thus referred to as hydrogen isotopes. The mass of an isotope influences many important properties.
Isotopes can form naturally through radioactive decay of a nucleus or artificially by inundating a stable nucleus with charged particles in a nuclear reactor using accelerators or neutrons.
Thus, the correct option is D.
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