Answer:
A. unexpected change in odor
Explanation: Common physical changes include melting, change of size, volume, color, density, and crystal form. Example the classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change.
Determine the number of significant figures in 53800
why is eating fruits and vegetables always included in the lists of prevention for malnutrition and micronutrients deficiencies
Order the following elements in order of increasing atomic size.1.Strontium 2.Tin 3.Iodine 4.Rubidium 5.Xenon
Answer Xenon.
Explanation:hope this helpssss
How many atoms is 45 moles of silicon (Si)?
Write the complete balanced chemical equation _A+_BC3->_AC2 +_ B
Answer:
Prueba con tus argumentos quienes sufren mas con la violencia?
Answer:
Sure! The complete balanced chemical equation for the reaction you provided is: `2A + BC3 -> AC2 + 3B`.
PLEASE MARK AS BRAINLIESTWhich has a greater volume, 100mL of alcohol or 100mL of water? Prove your answer.
Answer water
Explanation:
The representative particle for NaF
Answer:
Na2S, it is the formula unit
Explanation:
The representative particle of CO2 is the molecule, while for Na2S, it is the formula unit
1.I make my cup of coffee in the morning by pouring boiling water over ground-up coffee beans held in a special piece of paper and by collecting the brown liquid that comes through. Which techniques of the five described in the background section is/are used in the preparation of the cup of coffee
Answer:
Filtration
Explanation:
Filtration is a physical separation technique that is used to separate solids from liquids or gases. The process involves the use of a filter which allows just the liquid to pass through.
In this case, the coffee beans is the solid and the boiling water is the liquid. The special piece of paper is the medium (filter) through which the coffee is collected.
The coffee coming through the special piece of paper (filter) is called a filtrate.
Filtration is used in the preparation of the cup of coffee.
45) Rank Ca, Se, Co from the lowest to highest ionization energy.
46) Rank Te, S, and O from the lowest to the highest electronegativity.
Answer:
45) Ca < Co < Se
46) Te < S < O
Explanation:
These questions are talking about periodic trends. Here are some things to know about periodic trends:
Electronegativity
how well an element attracts an electronincreases left to right and bottom to top on the periodic tablenoble gases are not includedfluorine is most electronegative element, Francium is leastAtomic Radius
the distance between nucleiincreases from right to left and top to bottom on the periodic table the more electronegative an element is, the smaller it's atomic radiusFrancium has the largest atomic radius while fluorine has the smallestIonization Energy
the energy required to remove an electrondirectly proportional to electronegativityMetallic Character
how closely an element's properties match those of a metaldirectly proportional with atomic radiusHope this helps :)
As the volume of a gas increases, what happens to the pressure of the gas?
When 20g of hydrogen gas will react with 20g of chlorine gas, what is the mass of hydrogen chloride formed?
Answer:
40g
Explanation:
equation; H2 + Cl2 ---- 2HCl
mole ratio; 1 mole 1 mole 2 moles
before reaction;20g 20g 0g
after reaction; 20g 20g 40g
rite TRUE if the statement is correct and FALSE if it is
1. Coral reefs and mangrove swamps are rich so
2. Mangrove swamps protect coastline areas an
3. Cutting down of trees lessen global warming
4. Tropical rainforests serve as shelter and habi
5. Coral reefs come from the waste of marine a
6. Mangrove swamps are found on the deep p
7. Overfishing causes destruction to food chai
8. Coral reefs cause formation of tidal waves.
9. Rainforests ecosystems supply a variety of
10.Coral reefs serve as hatchery for birds.
plete the graphic organize below. Write why y
Ecosystomo
Answer:
uR making us work hard for this and yet all u give is 5 points
42 mole Al= how many atoms?
2.5 × 10²³ atoms Al
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
42 mol Al
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 42 \ mol \ Al(\frac{6.022 \cdot 10^{23} \ atoms \ Al}{1 \ mol \ Al})[/tex]Multiply/Divide: [tex]\displaystyle 2.52924 \cdot 10^{25} \ atoms \ Al[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
2.52924 × 10²³ atoms Al ≈ 2.5 × 10²³ atoms Al
onsider a tank used in certain hydrodynamic experiments. After one experiment the tank contains 200 L of a dye solution with a concentration of 1 g/L. To prepare for the next experiment, the tank is to be rinsed with fresh water flowing in at a rate of 2 L/min, the well-stirred solution flowing out at the same rate. Find the time that will elapse before the concentration of dye in the tank reaches 1% of its original value.
Answer:
Explanation:
From the given information;
Let Q(t) = mass of dye in the tank as a function of time
The mass in the tank = 200 L × (1g/L) = 200 g
Using the law of mass conservation;
[tex]\dfrac{dQ}{dt} = \text{(Rate of incoming mass)- (rate of outgoing mass)}[/tex]
[tex]\dfrac{dQ}{dt} = (2 L/min ) (0 \ g/L) - (2 L/min ) (\dfrac{Q}{200}g/L)[/tex]
[tex]Q' = \dfrac{-Q}{1000}[/tex]
Q(0) = 200
By finding the solution to the ODE using the method of separation of variables;
[tex]\dfrac{Q'}{Q} = -0.01[/tex]
[tex]Q(t) = Ce^{-0.01t}[/tex]
Using the initial condition;
200 = Q(0) = C
[tex]Q(t) = 200e^{-0.01t}[/tex]
1% of 200g = 2g of dye solution
∴
[tex]2 = 200e^{-0.01t}[/tex]
[tex]e^{-0.01t}=0.01[/tex]
[tex]t =\dfrac{ In(0.01}{-0.01}[/tex]
t = 460.5 hours
7. Circle the number that is larger in each pair.
5.6 x 10-6 or
5.6 x 10-5
10 because it's a large number
Which of the following atoms has the largest radius?
Mg
Si
S
Cl
Answer:
Mg
Hope this helps :D sorry if im wrong :(
Which two formulas are used to calculate potential and kinetic energy?
Answer:
[tex]\boxed{\bold { \large { \boxed {KE=\frac{1}{2} mv^2 \ , \ PE=mgh}}}}[/tex]
Explanation:
Kinetic energy formula
[tex]\displaystyle KE=\frac{1}{2} mv^2[/tex]
Potential energy formula
[tex]\displaystyle PE=mgh[/tex]
[tex]\displaystyle KE \Rightarrow \sf kinetic \ energy \ (J)[/tex]
[tex]\displaystyle PE \Rightarrow \sf potential \ energy \ (J)[/tex]
[tex]\displaystyle m \Rightarrow \sf mass \ (kg)[/tex]
[tex]\displaystyle v \Rightarrow \sf velocity \ (m/s)[/tex]
[tex]\displaystyle g \Rightarrow \sf acceleration \ of \ gravity\ (m/s^2)[/tex]
[tex]\displaystyle h \Rightarrow \sf height \ (m)[/tex]
• In trial 2 of the vinegar-baking soda reaction, how did the masses of reactants and products compare?
Answer:
Yes (In a closed (or sealed) system, the total mass of reactants and products will remain the same.)
Explanation:
Answer:
they are the same
Explanation:
^_^
When some solid ammonium nitrate was dissolved in water the temperature decreased from 22 oC to 3 oC. What can be deduced from this observation?
The dissolving is endothermic and ∆H is positive. The dissolving is endothermic and ∆H is negative. The dissolving is exothermic and ∆H is positive. The dissolving is exothermic and ∆H is negative.
Which is a correct statement about an endothermic reaction?
A. The bonds in the reactants are stronger than in the products and ∆H is positive.
B. The bonds in the products are stronger than in the reactants and ∆H is positive.
C. The bonds in the reactants are stronger than in the products and ∆H is negative
D. The bonds in the products are stronger than in the reactants and ∆H is negative.
Which is a correct statement about the following() enthalpy level diagram of a reaction? A. The reaction is exothermic and △H is positive.
E. The reaction is exothermic and △H is negative.
F. The reaction is endothermic and △H is positive.
G. The reaction is endothermic and △H is negative.
Which statements are correct for all exothermic reactions?
I. The products are more stable than the reactants.
II. The bonds in the products are stronger than the bonds in the reactants
III. The enthalpy of the products is less than the enthalpy of the reactants
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Answer:
1. The dissolving is endothermic and deltaH is positive
2. A. The bonds in the reactants are stronger than in the products and deltaH is positive
3. I can't see the diagram so I don't know the answer (it's a glitch on my part not yours, my school district blocks images automatically on their rented chromebooks)
4. A. I, and II only
Explanation:
When we measure the temperature of a solution, and we notice that the temperature of the water is decreasing, then this is an endothermic reaction..
The dissolved solute (the "invisible" ions) are absorbing the heat, causing the water around it to be colder.. **Heat moves from hot to cold, so the water is losing it's heat and the dissolving (dissolved solute) is gaining heat, meaning that it is Endothermic.
When a reaction is endothermic, the energy that is required to break bonds and attractive forces is greater than the energy required to form bonds and attractive forces. This means that the bonds in the reactants are stronger than in the products and deltaH is positive. Since we know that the energy in the reactants is greater, there is more heat in the reactants. This is also why the dissolved solute would be gaining heat.. If the energy of the reactants is stronger, when it breaks, it will release a lot of energy that the dissolved solute will be absorbing.
Think, heat (q, released or absorbed) is measured in Joules, the higher the Joules, the hotter something will be. So, if the heat (q) is negative, that represents the amount of Joules (heat) being released. If it is positive, that is the amount being absorbed. So, if heat is being absorbed then deltaH is positive.
If the diagram shows the products being at a higher energy level than the reactants, then the diagram shows an endothermic reaction.. If we see that the energy from the products is greater, than the energy of the system increased as it absorbed energy from its surroundings.
If the diagrams shows the reactants being at a higher energy level than the products, then the diagram shows an exothermic reaction.. Think of it this way, if we see that the energy from the reactants was greater, than the energy of the system was originally greater than the surroundings, but now (observing the products), it is not, as energy was lost to the surroundings, making this an exothermic reaction.
For exothermic reactions, the energy that is required to break bonds and attractive forces is less than the energy required to form bonds and attractive forces.. This means that energy in the products are greater, so as these bonds are broken and energy is released, the surroundings gain energy/heat. This means that the energy is favorable (more stable), the more negative our potential energy (energy of the system) is, the more favorable our process is.
please help me out right now
with what telll meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Helppppppppppppppppppppppp
Answer:
B. Periodic electrons
camouflage
2. chemical warfare
3. commensalism
4. indicator species
5. interspecific competition
a relationship in which one
organism lives in or on another organism
and benefits from that relationship while
the host organism is harmed by it
those species that normally live
and thrive in a particular community
species that play critical roles in
their communities and help determine
the types and numbers of other species
in a community
association in which one organism
is benefited and the other organism is
neither benefited nor harmed
20
species that serve as early
warnings of damage to a community or
ecosystem
competition between species for
shared or limited resources
using chemical substances to kill or
injure predator or prey
species that migrate or are
deliberately introduced into a community
where they would not normally live
a relationship between two kinds
of organisms that benefits both
blending in with one's
surroundings
an adaptation in which an animalis
protected against predators by its
6. invasive
7. keystone species
8. mimicry
9. mutualism
10. native species
11 parasitism
Every day a 6th grade class puts candy into bags to prepare for Valentine's Day. They put
7 pieces of candy in each bag. If they make 28 bags in 4 days, how many bags would
they make in 10 days?
Significant figures are a measure of __________. an precise and accurate answer. the true value of a measurement. accuracy. precision.
Answer:
Significant figures are a measure of precision.
Explanation:
The significant figures of a number are those that have a real meaning and, therefore, provide some information. Therefore, the set of digits that are known with certainty in a measure are called significant figures and are the digits of a number considered non-null.
Any experimental measurement is inaccurate and must be expressed with its significant figures.
In this way, significant figures express the precision of a measuring tool.
How many particles are in 67 grams of Oxygen?
How many moles are there in 1.20 x 1025 particles of helium?
Answer:
You would get 19.969 moles.
Explanation:
You would get 19.969 moles.
an atom of which element has the strongest attraction for electons in a chemical bond?cholorine, phosphorus, carbon, sulfur
The number of atoms of any element in the given chemical formula is the number that is written on the foot of the symbol of that element. Therefore, chlorine has the strongest attraction for electrons in a chemical bond.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.
Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus.
Electronegative element have greatest strongest attraction for electrons due to high effective nuclear charge. Among the given molecules, chlorine is the most electronegative element. Chlorine has the strongest attraction for electrons in a chemical bond.
Therefore, chlorine has the strongest attraction for electrons in a chemical bond.
Learn more about atoms, here:
https://brainly.com/question/13518322
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HELP PLS ILL GIVE BRAINLIEST AND 40 POINTS!!!
According to the information in the table, what comparison can Molly make about the densities of sugar and corn starch?
Density is mass divided by volume (D = M/V)
Select one:
A. Corn starch is more dense than sugar.
B. Sugar is more dense than corn starch.
C. Sugar is more dense than baking soda.
D. Both sugar and corn starch are more dense than salt.
Answer:
A.? I think it is A hope it helps
Suppose the reduction of nitric oxide proceeds by the following mechanism:
step elementary reaction rate constant
(g)
(g)
(g)
(g)
(g)
(g)
(g)
(g)
Suppose also
≫
. That is, the first step is much faster than the second.
Answer:
vgj I'll all all all
Explanation:
gghjjhhjjjjjjjj nnh
How many atoms are in 4.36 moles of copper ?
Answer:
Moles of Cr in 4.36×1023 atoms of Cr?
I mass of Cr = 52.00
A's# = 6.02x10^23
I don't know how to approach this. Help?
Update:
Moles of Cr in 4.36×10^23 atoms of Cr?
Update 2:
ALSO......
moles of Cu in 9.7×10^21 atoms of Cu?
moles of C2H6 in 2.75×10^23 molecules of C2H6?
Explanation: