Answer:
Animals need food, water, shelter, and space to survive. Herbivores can live only where plant food is available. Carnivores can live only where they can catch their food. Omnivores can live in many places because they eat both plants and animals.
According to the atomic model for matter when atoms are heated they move faster. This causes the rate of reaction to change because the atoms
become larger.
have a better chance of colliding with other atoms.
multiply.
stop moving.
B.) have a better chance of colliding with other atoms.
find the percent yield,if 6.0g of Licl are actually produced and the theoretical yield is 35.4g of Licl.
Answer:
Percent yield = 17%
Explanation:
Given data:
Actual yield of lithium chloride = 6.0 g
Theoretical yield of lithium chloride = 35.4 g
Percent yield = ?
Solution:
Formula:
Percent yield = (actual yield / theoretical yield )× 100
Now we will put the values in formula.
Percent yield = (6.0 g/ 35.4 g)× 100
Percent yield = 0.17 × 100
Percent yield = 17%
The density of krypton gas at 1.35 atm and 54.1°C is ________ g/L.
a. 4.21
b. 0.304
c. 8.42
d. 0.0503
e. 0.237
a.
Explanation: I saw it on another website.
The equation 2NaNO3 + CaCl2 - 2NaCl + Ca(NO3)2 is balanced. How many atoms
of sodium (Na) are there on either side of the equation?
one
two
four
six
Answer:3
Explanation:
I took the test
the correct answer is two
In chemical reaction atoms are what?
Answer:
In chemical reaction atoms are reactants10. For each of the following pairs of ionic compounds, state which would be expected to have the higher (more negative) lattice energy.
a. LiF or KBr
b. NaCl or MgS
c. MgO or RbI
Answer:
C I belive
Explanation:
The higher lattice energy in option a is for LiF. Similarly, MgS have higher lattice energy that NaCl and MgO have higher lattice energy than RbI.
What is lattice energy?Lattice energy of a compound is the energy required to convert one mole of that compound into its constituent gaseous ions. Lattice energy increases as the size of the ion decreases. As well as, higher the charge of the ions higher will be the lattice energy.
In LiF and KBr, Li and F are the smaller ions and is having higher lattice energy. In the case of NaCl and MgS, Mg and S are having +2 charge and are smaller causes MgO higher in lattice energy.
Similarly in the case of MgO and RbI the same concept can be applied. Rb⁺ and I⁻ are bigger ions where as Mg²⁺ and O²⁻ are comparatively smaller and have higher charge result in higher lattice energy.
Thus compound which have higher lattice energy in option a is LiF, in option b is MgS and in option C is MgO.
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A solution is made by adding 5.01 g of iron sulfate to 75.3 g of water. What is the mass percentage of iron sulfate in this solution?
Answer:
6.24 % of FeSO₄
Explanation:
Solute mass: 5.01 g of FeSO₄
Solvent mass: 75.3 g of water
Solution mass = solute mass + solvent mass
5.01 g + 75.3 g = 80.31 g
We can apply a rule of three. Mass percentage means the mass of solute which is contained in 100 g of solution. Then,
In 80.31 g of solution we have 5.01 g of solute
In 100 g solution, we may have (5.01 . 100)/ 80.31 = 6.24 g of solute.
This is the mass percentage: 6.24%
is the second one or the fourth one?
Answer:
D. Light waves travel fastest through a vaccumm
Explanation:
"In a vacuum , light waves move their fastest: 186,000 miles per second (300,000 kilometers per second). This is also the fastest that anything in the universe moves. But when light waves move through air, water or glass, they slow down."
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Hopefully I could help! Good luck.
What type of reaction is Cl2+2NaBr=NaCl+Br2
Answer:
Displacement reaction
Calcium is an element. What is the smallest particle of calcium that has the same chemical properties of calcium?
A. an atom of calcium
B. a proton from a calcium atom
C. an electron from a calcium atom
D. a molecule that contains calcium
Answer:
A. An Atom
Explanation:
An atom is the smallest particle of an element, having the same chemical properties as the bulk element.
An atom of calcium is the smallest particle of calcium that has the same chemical properties of calcium.
What is an atom ?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Titration of a strong acid with a strong base. The pH curve for titration of 50.0 mL of a 0.100 M solution of hydrochloric acid with a 0.100 M solution of NaOH(aq). What volume of NaOH(aq) would be needed to reach the equivalence point if the concentration of the added base were 0.240 M?
Answer:
Explanation:
we know that M1V1=M2V2
M1=0.100 M
V1=50.0*10^-3 L
M2=0.100 M
V2=M1V1/M2
V2=0.100*50.0*10^-3/0.100
V2=0.05
To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen. The volume of NaOH needed to reach the equivalence point if the concentration of the added base were 0.240 M is 20.8ml.
What is titration?Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known.
The balanced equation is
HCl+NaOH[tex]\rightarrow[/tex]NaCl+H₂O
Using following equation
M₁×V₁=M₂×V₂
Where,
M₁=molarity of HCl= 0.100 M
V₁=volume of HCl=50.0 mL
M₂=molarity of NaOH=0.240 M
V₂=volume of NaOH=?
Substituting the given values
0.100 M ×50.0 mL=0.240 M×V₂
V₂=20.8ml
Therefore, the volume of NaOH needed to reach the equivalence point if the concentration of the added base were 0.240 M is 20.8ml.
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Which process is shown in the diagram?
0,
ing
CO, +H,0
Chloroplast
Mitochondrion
Sugar
Heat
o
ATP
Respiration
The cellular respiration process, which generates ATP as the final result, employs oxygen and sugar as reactants. So, the correct option is A.
What is Cellular respiration?Cellular respiration is the process by which organisms combine oxygen with food molecules, channeling the chemical energy from those resources into life-sustaining activities while eliminating carbon dioxide and water as waste.
Both oxygen and glucose are reactants in the mobile respiratory system. ATP is the primary component of mobile respiration; waste products include carbon dioxide and water.
Oxygen might be present or absent while cells are respiring. Nonetheless, the activity is essentially known as "cellular respiration" because the cell seems to "respire" by consuming molecular oxygen (as an acceptor of electron) and exhaling carbon dioxide (as an end product).
Therefore, the correct option is A.
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Your question is incomplete, most probably the complete question is:
The process shown in the diagram produces oxygen and sugar. Which
process uses oxygen and sugar as reactants?
Chloroplast
Mitochondrion
Sugar
CO, +H,0
ATP
Heat
Respiration
A. Cellular respiration
B. Water cycle
c. Transpiration
D. Photosynthesis
Convert the speed of light, 3.0 x 10^8 m/s, into mi/hr. (1610 m = 1 mi). Could you please explain step by step thank you!
Answer:
[tex]v=6.7\times 10^9\ mi/hr[/tex]
Explanation:
Given that,
The speed of light is 3×10⁸ m/s
We need to convert it into mi/hr.
Since, 1 mile = 1610 m
1 hour = 3600 s
So,
[tex]v=3\times 10^8\ \dfrac{m}{s}\\\\=3\times 10^8\ \dfrac{\dfrac{1}{1610}\ \text{miles}}{\dfrac{1}{3600}\ s}\\\\=6.7\times 10^9\ mi/hr[/tex]
So, the required speed of light is [tex]6.7\times 10^9\ mi/hr[/tex].
Vitamin C contains the elements C, H, and O. It is known to contain 40.9% C and 4.58% H by mass. The molar mass of vitamin C has been found to be about 180 g/mol. The molecular formula for vitamin C is _________
Answer:
C₆H₈O₆
Explanation:
First off, the percent of oxygen by mass of vitamin C is:
100 - (40.9+4.58) = 54.52 %Assume we have one mol of vitamin C. Then we would have 180 grams, of which:
180 * 40.9/100 = 73.62 grams are of Carbon180 * 4.58/100 = 8.224 grams are of Hydrogen180 * 54.52/100 = 98.136 grams are of OxygenNow we convert each of those masses to moles, using the elements' respective atomic mass:
C ⇒ 73.62 g ÷ 12 g/mol = 6.135 mol C ≅ 6 mol CH ⇒ 8.224 g ÷ 1 g/mol = 8.224 mol H ≅ 8 mol HO ⇒ 98.136 g ÷ 16 g/mol = 6.134 mol O ≅ 6 mol OSo the molecular formula for vitamin C is C₆H₈O₆
The diagram illustrates the water cycle.
Parts of the water cycle labeled U through Z. U: Water moving from a lake into the clouds. V: Clouds. W: Water falling from clouds as rain and snow. X: Water moving from ground to the clouds. Y: Water flowing down the mountainside into a lake. Z: Underground water going into lake.
Which process occurs at location W?
precipitation
evaporation
condensation
transpiration
Answer:
Precipitation
Explanation:
In the water cycle, water experiences different phase changes from one state to another in nature.
The cycling affords water to in solid, liquid and the vapor form.
From the cycle show, W represents precipitation.
During precipitation, water in the atmosphere begins to fall. U is evaporationX is transpiration. V is the condensation.Answer:
precipitation
Explanation:
Which group of organisms is an example of a population?
Answer:Leopard Frogs all together in a stream
Explanation:
SOMEONE PLEASE HELP
Answer:
6. 7870 kg/m³ (3 s.f.)
7. 33.4 g (3 s.f.)
8. 12600 kg/m³ (3 s.f.)
Explanation:
6. The SI unit for density is kg/m³. Thus convert the mass to Kg and volume to m³ first.
1 kg= 1000g
1m³= 1 ×10⁶ cm³
Mass of iron bar
= 64.2g
= 64.2 ÷1000 kg
= 0.0642 kg
Volume of iron bar
= 8.16 cm³
= 8.16 ÷ 10⁶
[tex] = 8.16 \times 10^{ - 6} \: kg[/tex]
[tex]\boxed{density = \frac{mass}{volume} }[/tex]
Density of iron bar
[tex] = \frac{0.0642}{8.16 \times 10^{ - 6} } [/tex]
= 7870 kg/m³ (3 s.f.)
7.
[tex]\boxed{mass = density \: \times volume}[/tex]
Mass
= 1.16 ×28.8
= 33.408 g
= 33.4 g (3 s.f.)
8. Volume of brick
= 12 cm³
[tex] = 12 \times 10^{ - 6} \: m^{3} \\ = 1.2 \times 10^{ - 5} \: m ^{3} [/tex]
Mass of brick
= 151 g
= 151 ÷ 1000 kg
= 0.151 kg
Density of brick
= mass ÷ volume
[tex] = \frac{0.151} {1.25 \times 10^{ - 5} } \\ = 12600 \: kg/ {m}^{3} [/tex]
(3 s.f.)
Calculate the mass in grams of 0.0035 mol of NaNO3
Answer:
The Mass in Grams= 0.5145
Explanation:
The atomic mass of Na=23
The atomic mass of No3= 62
we multiply 0.0035×((23×1)+(62×2)) = 0.5145 grams
A) A solution of c6h2o4 in c2h5oh has a boiling point of 80.38 Celsius. what is the molality of the solution ?
B) what is the approximation of concentration of dissolved solution in blood, if the osmotic pressure is 7.65 atm at 37Celsius.
a. molality-m=1.623
b. molarity-M=0.3
Further explanationa. Boiling point
[tex]\tt \Delta Tb=Kb\times m[/tex]
Kb for ethanol=1.22 °C/m
Boiling point for ethanol = 78.4 °C
ΔTb=80.38-78.4=1.98
[tex]\tt 1.98=1.22\times m\\\\m=\dfrac{1.98}{1.22}=1.623[/tex]
b. osmotic pressure
[tex]\tt \pi =MRT[/tex]
π = 7.65 atm
R = 0.08205 L/atm K
T = 37 + 273 = 310 K
[tex]\tt M=\dfrac{\pi}{RT}=\dfrac{7.65}{0.08205\times 310}=0.3~M[/tex]
what is the potentual energy of 7 kg object, 12 m off the ground?
Answer:
823.2 J
Explanation:
PE = mgh
= (7 kg) (9.8 m/s^2) (12 m)
= 823.2 J
Answer:
Required Answer:-Mass=m=7kg
Height=h=12m
Gravitational force=g=10m/s^2
As we know that[tex]{\boxed{\sf Potential\:energy{}_{(P.E)}=mgh}}[/tex]
Substitute the values[tex]{:}\longmapsto [/tex][tex]\sf P.E=7×12×10 [/tex]
[tex]{:}\longmapsto [/tex][tex]\sf P.E=84×10[/tex]
[tex]{:}\longmapsto [/tex][tex]\sf Potential\:energy=840Joule [/tex]
what is the correct equation for water gas
Answer:
Water-gas A mixture of carbon monoxide (CO) and hydrogen (H2) produced by passing steam over red-hot coke using the endothermic reaction C + H2O # CO + H2.
Explanation:
An observation that deals with numbers is a(n)
A. Prediction
B. Quantitive observation
C. Evaluation
D. Qualitative observation
Answer:
B (Quantitative)
Explanation:
a clever way to remember the difference between quantitative and qualitative is that there is a n in quantitative which is the first letter to the word number. So quantitative is an oberservation with numbers
what are atoms made up of
Answer:
They are made up of electrons, neutrons and protons
Explanation:
11. Which branch of chemistry is concerned with the behavior of substances?
Biochemistry
Physical
Inorganic
O Organic
Answer:
Physical
Explanation:
Which of the following is composed of elements combined in a specific ratio?
Answer:
compound
Explanation:
A yellow line occurs at 572.8 nm in the emission spectrum of phosphorus. What amount of energy, in joules, must be released by an electron in a phosphorus atom to produce a photon of this light?
Answer:
3.47 × 10⁻¹⁹ J
Explanation:
A yellow line occurs at 572.8 nm in the emission spectrum of phosphorus. When an electron undergoes this process, it requires an amount of energy to produce a photon of this light. We can calculate the energy (E) using the following expression.
E = h × c/λ
where,
h: Planck's constant (6.63 × 10⁻³⁴ J.s)c: speed of light (3.00 × 10⁸ m/s)λ: wavelength (572.8 nm = 5.728 × 10⁻⁷ m)E = 6.63 × 10⁻³⁴ J.s × 3.00 × 10⁸ m/s/5.728 × 10⁻⁷ m
E = 3.47 × 10⁻¹⁹ J
How does conduction happen?
Answer:
Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules. ... The fire's heat causes molecules in the pan to vibrate faster, making it hotter. These vibrating molecules collide with their neighboring molecules, making them also vibrate faster.
Explanation:
Luca made the following chart for Earth’s four basic movements. What needs to be correct on his chart? Rotation Speed Revolution Speed Solar System Speed Milky Way Speed 0.3 miles/sec 18.5 miles/sec 370 miles/sec 150 miles/sec The solar system speed and Milky Way speed should be switched. The rotation speed and revolution speed should be switched. The revolution speed and solar system speed should be switched. The rotation speed and Milky Way speed should be switched.
Answer:The Solar System speed and Milky Way speed should be switched
Explanation:
The Milky Way speed and solar system speed should be switched with each other. Therefore, option (A) is correct.
What is the speed of the earth's revolution and rotation?The rotation of the earth can be described as the spinning of the Earth around its own axis. The axis has an angle of 23(1/2)° and it is perpendicular to the plane of the orbit of the earth. The northern and southern hemispheres lean in a direction away from the Sun because Earth is tilted on its axis. The rotation speed of the earth is 0.3 miles/sec.
The Revolution of the earth is the movement of the Earth around the Sun in a fixed path. The revolution speed of the earth is 30 Km/s or 18.5 miles/sec. The milky way speed of the earth is 370 miles/sec and the solar system speed of the earth is 130 miles/sec.
But according to Luca's chart, the milky way speed is 150 miles/sec and the solar system speed is 370 miles/sec.
Therefore, the solar system speed and Milky Way speed need to be switched.
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A scientist is measuring how quickly different liquids flow
down a ramp. She notices that water flows more easily
than dish soap.
Which property of water is the scientist observing?
A. Viscosity
B. Compression
C. Crystalline structure
D. Surface tension

Answer:
I think its A
Explanation:
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What is the enrgy change when the temperature of 14.4 grams of solid alumnum is decreased from 39.5°C to 23.0°C?
Answer:
[tex]Q=-213.84J[/tex]
Explanation:
Hello!
In this case, since energy involved when a substance undergoes a temperature change due to heat addition or removal is computed as shown below:
[tex]Q=mC\Delta T[/tex]
As the aluminum has a specific heat of 0.900 J/g°C and 14.4 g underwent such temperature decrease, the energy change is:
[tex]Q=14.4g*0.900\frac{J}{g\°C}(23.0\°C-39.5\°C)\\\\Q=-213.84J[/tex]
Which is an outlet energy flow.
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