Answer:
B
Explanation:
In an endothermic reaction, strong bonds break and weak bonds form.
How do animals get energy from food?
Answer:
because plants have energy in them from the sun and
Answer:
Animals get energy from food through the digestion process :)
If element X has 6 valence electrons, what is the formula between element X and
magnesium.
a. X6Mg2
b. MgX3
c. MgX
d. XMg
A cube of iron and a cube of wood, each having a volume of V = 3.25 10-4 m3, are each placed in a large beaker of water. The density of the wood is rhowood = 3.73 102 kg/m3 and the density of the iron is rhoiron = 7.86 103 kg/m3. Calculate the buoyant force on each. (The cube of wood is allowed to float at the surface.)
Answer:
anor277
Nov 17, 2017
Well, by definition,
Molarity
≡
Moles of solute
Volume of solution
Explanation:
And thus...
moles of solute
=
molarity
×
volume
We use a molar quantity of
80.3
⋅
g
174.01
⋅
g
⋅
m
o
l
−
1
=
0.461
⋅
m
o
l
with respect to
potassium sulfate
And thus
volume
=
moles of solute
molarity
80.3
⋅
g
174.01
⋅
g
⋅
m
o
l
−
1
3.12
⋅
m
o
l
⋅
L
−
1
=
0.148
⋅
L
.
The buoyant force is one that acts against the weight of an object suspended in a fluid. The value of the buoyant force on each are:
i. Buoyant force on the cube of iron = 25.0 N
ii. Buoyant force on the cube of wood = 1.20 N
Upthrust is a force which acts against the direction of the weight of an object when suspended in a fluid. It acts majorly upwards against gravity, and it can be referred to as a buoyant force.
The amount of upthrust on object in a fluid sometimes depends on the density, volume and gravity acting on the object.
So that;
Upthrust = density x volume x gravity
Thus from the given question;
i. The buoyant force on the cube of iron can be determined by:
Upthrust = 7.86 x [tex]10^{3}[/tex] * 3.25 x [tex]10^{-4}[/tex] * 9.8
= 25.034
Upthrust = 25.0 N
Therefore, the buoyant force on the cube of iron is 25.0 N.
ii. The buoyant force on the cube of wood can be determined by:
Upthrust = 3.73 x [tex]10^{2}[/tex] * 3.25 x [tex]10^{-4}[/tex] * 9.8
= 1.1880
Upthrust = 1.20 N
Therefore, the buoyant force on the cube of wood is 1.20 N.
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A compound of copper and sulfur contains 76.84 g of metal and 38.53 g of nonmetal. How many grams of copper are in 3801 kg of the compound? How many grams of sulfur?
Answer:
There are:
2'531,500 g Cu1'269,500 g SExplanation:
First calculate the percentage of Cu and S in the compound:
Total mass = 76.84 g + 38.53 g = 115.37 g% metal (Cu) = 76.84/115.37 * 100% = 66.6%% metal (S) = 38.53/115.37 * 100% = 33.4%These percentages will remain the same no matter how much of the compound we analyze.
Now we calculate the grams of Cu and S in 3801 kg of the compound:
kg Cu = 3801 kg * 66.6/100 = 2531.5 kg Cug Cu = 2531.5 kg * 1000 = 2531500 g Cukg S = 3801 kg * 33.4/100 = 1269.5 kg Sg S = 1269.5 kg * 1000 = 1269500 g S2. A person with a body temperature of 37°C holds an ice cube with a temperature of 0°C
in a room where the air temperature is 20°C. The direction of heat flow is
a) From the person to the ice, only
b) From the person to the ice and air, and from the air to the ice
c) From the ice to the person, only
d) From the ice to the person and air, and from the air to the person
Answer:
b) From the person to the ice, and from the air to the ice
Explanation:
The direction of heat flow in the room is from the person to the ice and from the air to the ice.
The ice is at the lowest temperature.
Heat flows from a place with a higher measure of heat to a place with a lower amount of heat. Since the ice has the lowest heat, there is a thermal gradient set up. Heat will flow from the body and air towards to the ice.When the particles, such as atoms, molecules, or ions, of a solid phase are arranged in a regular pattern, then the solid is a(n) __________.
Answer:
Crystal / Crystalline Structure
Explanation:
These structures contain particles in a regular pattern, and we call them crystals.
Hope this helped!
Give examples of solid materials that dissolve completely in liquid materials.How about those that do not?
ANSWER: Things like salt, sugar and coffee dissolve in water. They are soluble. They usually dissolve faster and better in warm or hot water.
When metals, non metals,and metallics are composed according to luster, which is best description of the appearance of metalloids
Answer:
Metalloids are metallic-looking brittle solids that are either semiconductors or exist in semiconducting forms, and have amphoteric or weakly acidic oxides. Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides.
Explanation:
Metalloids are sometimes known as semimetals. Metalloids are yellow elements on the periodic table that often lie along the stair-step line.
What are Semimetals ?Metals are at the bottom left of the periodic table, and non-metals are at the top right.
Semimetals are found at the diagonal dividing line between metals and non-metals.
If there is barely any overlap between the top and bottom of the valence band, a substance is classified as a semimetal.
According to the electronic band theory, solids can be classified as metals, semimetals, insulators, or semiconductors.
An element that resembles metal in some ways but is not a metal For instance, although arsenic is a metalloid and appears to be a metal, it really conducts electricity poorly.
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What is the answer? Please
Answer:
Cell
Explanation:
I just passed this unit a month ago.
Answer:
It is 6. Cell
Explanation:
Cells make up the smallest level of a living organism such as yourself and other living things. The cellular level of an organism is where the metabolic processes occur that keep the organism alive. That is why the cell is called the fundamental unit of life.
I really hope this helped. God bless you and have a great day! :-)
8
Which of the pictures demonstrates a state of matter WITHOUT a fixed shape or fixed
volume?
Answer:
K
Explanation:
The picture that demonstrates a state of matter without a fixed shape or fixed volume is picture K.
Gases are one of the three states of matter without a fixed shape and volume. They simply take up the shape of their containers and are free to move all about.
Liquids and solids are known to have fixed shape and volume. Liquids are know for their ability to flow. Figure LSolids are rigid bodies. It is the figure JWhich of the following grouping contains only representative elements?
A. Na, Co, S
B. Ni, Ga, Zn
c. AI, Mg, LÍ
D. CI, O, Cd
Answer:
C
Explanation:
Al=Aluminum
Mg=Magnesium
A soccer player practices kicking the ball into the goal from halfway down the soccer field, which is 45 meters away. The time it takes for the ball to get to the goal from the time it is kicked is 3 seconds. The player wants to know the velocity of the ball.
Is there enough information to calculate this?
Yes, displacement is 45 meters, elapsed time is three seconds, and the direction is toward the goal. Velocity is 135 m/s toward the goal.
No, only speed can be calculated from the distance of 45 meters and the time of 3 seconds.
Yes, displacement is 45 meters, time is three seconds, and the direction is toward the goal. Velocity is 15 m/s towards the goal.
Answer:
Yes, displacement is 45 meters, time is three seconds, and the direction is toward the goal. Velocity is 15 m/s towards the goal.
Explanation:
Hope this helped!
A student uses the periodic table to construct a model that uses a simple diagonal arrow to depict decreasing electronegativity. Where should the arrow point to indicate the lowest electronegativity of all the elements?
Answer:
helium
Explanation:
helium has the highest ionization energy level
An element's ability to attract shared electron thus forming covalent bonds is a measure of it's electronegativity. Hence, in other indicate decreasing level of electronegativity, arrow must point to the left across groups and down along the column.
Electronegativity of elements on the periodic table decreases along the groups on the periodic table with elements, Helium and Fluorine being the most electronegative Along the columns, electronegativity decreases downwards with cesium and francium being the least electronegative.Therefore, the arrow should point from right to left across the group and top to bottom along the columns.
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If 87 grams of K2SO4 (molar mass 174 grams) is dissolved in enough water to make 250 milliliters of solution, what are the concentrations of the potassium and the sulfate ions?
Answer:
[tex]M_{K^+}=4.0M \\\\M_{SO_4^{2-}}=2.0M[/tex]
Explanation:
Hello!
In this case, since the molarity of a solution is defined as the moles of solute divided by the volume of solution liters, given the mass of potassium sulfate, we can compute the moles by using its molar mass (174.24 g/mol):
[tex]n_{K_2SO_4}=87gK_2SO_4*\frac{1molK_2SO_4}{174.27gK_2SO_4} =0.50molK_2SO_4[/tex]
Thus, since one mole of potassium sulfate has two moles of potassium ions (K₂) and one mole of sulfate ions, we can compute the moles of each ion as shown below:
[tex]n_{K^+}=0.50molK_2SO_4*\frac{2molK^+}{1molK_2SO_4}=1.0molK^+\\\\ n_{SO_4^{2-}}=0.50molK_2SO_4*\frac{1molSO_4^{2-}}{1molK_2SO_4}=0.50molSO_4^{2-}\\[/tex]
In such a way, the molarity of each ion turns out:
[tex]M_{K^+}=\frac{1.0mol}{0.250L}=4.0M \\\\M_{SO_4^{2-}}=\frac{0.5mol}{0.250L}=2.0M[/tex]
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Hybrid orbitals are formed by combining the valence orbitals on an atom. A molecule has sp3 hybridization with 2 lone pairs.
a. The electron pair geometry of this molecule is:_______
b. The geometry of this molecule is:_______
Answer:
Tetrahedral
Bent
Explanation:
A molecule in sp3 hybridization is ordinarily expected to exhibit tetrahedral electron domain geometry. This implies that it has four electron domains.
We were specifically informed in the question that two lone pairs are present. Remember that lone pairs distort the molecular geometry away from the expected geometry based on VSEPR theory.
Therefore, the bond angle of the molecule is <<109.5 degrees and its molecular geometry is bent (e.g water)
Use the data from the following figures to answer the questions below.
SUBSTANCE
DENSITY_9
cm
cork
0.22
water
1.0
sugar
1.6
aluminum
2.7
79
gold
19.3
02000 Ossewwe, in
The cube has a mass of 72.9 g.
iron
3 cm
3 cm
3 cm
2008 Ogsewu, in
What is its density in g/cm?
What substance is it?
Answer:
2.7g/cm³
Aluminum
Explanation:
Given parameters:
Mass of the cube = 72.9g
Unknown:
Density of the cube = ?
Solution:
To solve this problem, we need to find the density of the cube. The mass is given and the dimensions of the solid figure.
Now;
Density is the mass per unit volume of a substance
Density = [tex]\frac{mass}{volume}[/tex]
Volume of the cube = L³ = 3³ = 27cm³
So;
Density = [tex]\frac{72.9}{27}[/tex] = 2.7g/cm³
The body is aluminum because it has a density of 2.7g/cm³
SKILL: MAKING VALID GENERALIZATIONS Use the paragraph below to answer the following questions. The Chinese people also call the Huang River “China’s Sorrow.” The river was unpredictable and sometimes dangerous. It brought life to the land. But it also frequently took life away. Destructive floods could come without warning, sometimes as often as every two years. Sometimes a flood drowned thousands of people. At times, the river flooded with such force that the water cut an entirely new path over the land. The course of the river could change by hundreds of miles. What is a generalization you can make about the Huang River?
Answer:
Hope this helps
Explanation:
A generalization I can make about the Huang River is that the Huang River is the most important river in China. Also called the Yellow River, it is where historians believe ancient Chinese people settle in to develop its civilization on the banks of the river for the many benefits it had for life and agriculture. However, early Chinese people had to learn how to control the floods of the river in order to survive ad prosper.
Answer:
other guys is correct
Explanation:
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:
fou maybe
Explanation:
it was my answer hehe
Answer:2
Explanation:
Because it is
Calculate the mass of zinc that reacts with 16.23 g of hydrochloric acid to form 15.2 g of zinc chloride and 18.97 g of hydrogen gas
Answer:
17.94 g
Explanation:
A plastic ball’s density is 0.802 g/mL. What volume would a 15.8 g plastic ball occupy?
Answer:
19.70 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{15.8}{0.802} \\ = 19.700748...[/tex]
We have the final answer as
19.70 mLHope this helps you
if the frisbee represents light, what does the fence represent?
Answer:
I think vaccum
Explanation:
Answer:
It represents how light can go through something.
Explanation:
what reacts at room temperature with ethanol and also with ethanoic acid
Answer: Its esterification reaction.
when organic acid react with alcohol it forms ester and water. reaction is known as esterification reaction.
CH3COOH + C2H5OH → CH3COOC2H5 + H2O
ethanoic acid + ethanol → ethyl acetate + water
this reaction takes place in the presence of acid catalyst ( dil H2SO4).
in this reaction oxygen of ethanol with lone pair act as nucleophile and carbonyl carbon of acetic acid act as electrophile.. so its nucleophilic substitution reaction of -COOH group.
Explanation:
Sweat is made up of all EXCEPT what?
*
A.Sugar
B.Salt
C.Urea
D.Urine
The substrate is the same in parts a and b, however the mechanism that proceeds is different. Explain how the choice of solvent (acetone vs. methanol) influences the reaction mechanism between benzyl bromide and a nucleophile.
Answer:
See explanation
Explanation:
The reaction of a benzyl bromide with a nucleophile may proceed by SN1 or SN2 mechanism depending on the nature of the solvent used.
Since SN1 reaction involves the formation of a carbocation, it usually predominates in the presence of a poor nucleophiles and protic solvents. Hence when methanol is used as solvent and a poor nucleophile is used, SN1 mechanism predominates.
However, when acetone which is an aprotic solvent is used in the presence of a good nucleophile, SN2 reaction mechanism predominates.
Some landforms develop slowly and other landforms develop rapidly. Which rapidly developing landform is often found in Florida?
Answer:
Beaches.
Aquifers.
Sinkholes.
Caverns.
Coastal plains.
Upland (hilly areas)
Swampy Everglades.
Florida Keys (archipelago)
Explanation:
bc these are some of the landforms in flordida
Sinkholes are of interest in Florida because they are one of the frequent landform features of the State. Because they cause flooding during storms when the drainage capability of natural subsurface conduits is transcended. They supply an avenue for pollutants on the land surface to move rapidly.
What are the four types of landforms?Mountains, hills, plateaus, and plains are the main four types of landforms. Minor landforms consider buttes, canyons, valleys, and basins. Tectonic plate movement under Earth can develop landforms by pushing up mountains and hills.
In Florida's landscape is made up of “karst” landforms. A karst terrain is a land surface formed by water dissolving the bedrock and is characterized by sinkholes, cavern systems and disappearing streams and springs.
Thus, coastal erosion sinkholes sand dunes underwater earthquakes aquifers volcanic activity.
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Explain why atoms in group 2a are likely to form ions with plus two charge explain why why atoms in group 7a are likely to form ions with a minus one charge
Answer:
Atoms in group 2a are likely to form ions with a +2 charge because they have two valence electrons, both of which experience a very weak pull from the nucleus due to electron shielding. This causes the atoms to be easily pulled away from the nucleus, creating the +2 ions we see in nature.
Atoms in group 7a are likely to form ions with a -1 charge because they are one electron away from completing their outermost shell. The large number of protons in the middle of these atoms also causes the valence electrons to experience a stronger net force. This force also pulls strongly on the valence electrons of other atoms, causing the -1 ions we see in nature.
I need help with this. Read instructions and help plzz
Answer:
e
Explanation:
What had the study of fossils allowed scientist to do
Answer:
it let them know what lived before them besides their old, dead grandpas
Explanation:
aaaaaaaa
Answer:
It let us know what came before us, what the past was like, and gave them a little idea of what happened.
Explanation:
What is the mass of insoluble lead(II) iodide (461.0 g/mol) produced from 0.830 g of potassium iodide (166.00 g/mol) and aqueous lead(II) nitrate?A) 4.61 g. B) 0.149 g.C) 2.31 g.D) 1.15 g.E) 0.598 g.
Answer:
C
Explanation:
The mass of insoluble lead iodide produced from 0.830 g of potassium iodide in a reaction with lead nitrate is 2.31 g. Thus option C is correct.
What is lead iodide?Lead iodide or PbI is an ionic compound formed from the ionic bonding between metal lead and iodine. It is industrially prepared from the reaction of aqueous lead nitrate with potassium iodide.
Potassium iodide easily reacts with lead iodide as per the reaction written below:
[tex]\rm KI + PbNO_{3} \rightarrow KNO_{3} + PbI[/tex]
As per this reaction one mole of potassium iodide produce one mole of lead iodide. The molar mass of potassium iodide is 166 g/mol and that of lead iodide is 461 g/mol.
Thus, 166 g of potassium iodide gives 461 g of lead iodide. The mass of lead iodide then produced from 0.830 g of potassium iodide is calculated as follows:
mass = (0.830 g × 461)/ 166
= 2.31 g.
Hence, the mass of insoluble lead iodide produced from 0.830 g of potassium iodide in a reaction with lead nitrate is 2.31 g and option C is correct.
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Polyatomic ions are built upon the idea of
Answer: covalent bonding
Explanation: atoms that carries a net charge due to the fact that the total number of electrons in the molecule is not equal to the total number of protons in the molecule.
I hope this is what you're looking for, have a great day!