Answer:The chemical energy
Explanation:because The chemical energy in the food you eat is changed into another kind of chemical energy that your body can use. Your body then uses that energy to give you the kinetic energy that you use in everything you do.
Answer:
c i think
Explanation:
A sumo wrestler is 330 pounds. How much force does the earth exert on him? (Weight)
Answer:
1336.4N
Explanation:
Given parameters:
Mass of the sumo wrestler = 330pounds
Unknown:
Amount of force the earth exerts on the wrestler = ?
Solution:
The force the earth exerts on the wrestler is the weight of the man;
Weight = mg
where;
m is the mass
g is the acceleration due to gravity
Now,
let us convert from pounds to kg;
2.2pounds = 1kg
300 pounds = [tex]\frac{300}{2.2}[/tex] = 136.4kg
Weight = 136.4kg x 9.8m/s² = 1336.4N
Which of the following is true about wind and water changing the size of mountains over many millions of years? A: The continuous movement of wind and water changes the size of mountains over many millions of years B: Nothing can change the size of mountains over many millions of years not even the continuous movement of wind and water. C: The continuous movement of wind and water changes the size of some mountains, but not all mountains D: Even though mountains change in size over many millions of years, the changes are not due to the continuous movement of wind and water
Answer:
I would say A
Explanation:
normally wind and water will work together to erode or brake away a cliff or mountain.
There is an example of this in Illinois (There are eroded away cliffs located next to the Mississippi River, they stretch from around Grafton to Alton).
3
Select the correct answer.
Which form of light can a human eye see?
O A infrared light
OB.
near-infrared light
-
O c. ultraviolet light
OD
visible light
Answer:
human can see visible light
Answer:
i beleive it is D. visible light
Explanation:
if im wrong sorry this subject isnt my forte
What evidence was used in the investigation of the Gaetane Bouchard's murder? Was it considered class evidence or individual evidence?
Answer:
class i believe
Explanation:
What force works against friction
Answer:
work done
Explanation:
i think
work done
this is answer
Which of these is given away or accepted by an atom when it reacts with other atoms?
Electron
Neutron
Nucleus
Proton
A; Electron is your answer.
Answer:
Electron
Explanation:
An atom can either gain, share, transfer, and/or lose electron(s)
Which of the following is NOT a part of Dalton's atomic theory
Answer:
u didn't give us the multiple hoice answer
Explanation:
Answer:
Here are the answer choices
Explanation:
A) Compounds contain atoms of at least two different elements.
B) Each element is made up of atoms.
C) Each element contains atoms with negatively charged particles.
D) Atoms within the same element have the same amount of mass.
Determine the mass of CaCl2·2H2O(MW 147.02g/mole) to weigh out using a four-place analytical balance to prepare 100mL of a 0.1005M solution of Ca2+.
Answer:
1.4776 g
Explanation:
First, let us determine the number of moles present in 100 mL of 0.1005 M solution of Ca2+.
mole = molarity x volume in Liter
mole of Ca2+ = 0.1005 x 0.1 = 0.01005
Also,
mole = mass/molar mass
mass of 0.01005 mole Ca2+ = mole x molar mass
= 0.01005 x 147.02 = 1.4776 g
Since 1 mole of Ca2+ is present is 1 mole of CaCl2·2H2O, 1.4776 g of CaCl2·2H2O would be weighed out in order to prepare 00mL of a 0.1005M solution of Ca2+.
To prepare a 100 mL solution of 0.1005 M [tex]Ca^2^+[/tex], we would need to weigh out approximately 14.737 grams of [tex]CaCl_2.2H_2O[/tex].
We must use the molar mass and molarity formula to calculate the mass of [tex]CaCl_2.2H_2O[/tex] needed to make a 0.1005 M solution of [tex]Ca^2^+[/tex].
Let's start by figuring out how many moles of [tex]Ca^2^+[/tex]are needed for the solution:
Molarity (M) = moles/volume (L)
0.1005 M = x moles/0.1 L (100 mL converted to liters)
x = 0.1005 moles of [tex]Ca^2^+[/tex]
So, the molar mass of [tex]CaCl_2.2H_2O[/tex]:
Ca (40.08 g/mol) + 2Cl (35.45 g/mol) + 2([tex]H_2O[/tex]) (2 * 18.02 g/mol) = 147.02 g/mol
Then, we calculate the mass
Mass = moles * molar mass
Mass = 0.1005 moles * 147.02 g/mol
Mass = 14.737 grams
Therefore, to prepare a 100 mL solution of 0.1005 M [tex]Ca^2^+[/tex], we would need to weigh out approximately 14.737 grams of [tex]CaCl_2.2H_2O[/tex].
Learn more about Molar mass, here
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A students drawing of a nitrogen atom is shown. What change would make the model more accurate?
A-move the electrons into the nucleus
B-add 2 more protons
C-show 7 neutrons in the nucleus
D-remove 2 electrons
(Please leave a small explanation)
Answer:
C - show 7 neutrons in the nucleus
Explanation:
Use process of elimination:
-Answer A will not work because electrons are not in the nucleus.
-Answer B will change the atom's identity from nitrogen to fluorine; it will not work.
-Answer D will create a nitrogen ion, which is not what the prompt is asking for (an atom); it will not work.
The only logical answer is C, as that is the only one that is also true.
What is the mass number of an atom that has six protons , six electrons and eight neutrons
Answer:
14
Explanation:
Given parameters:
Number of protons = 6
Number of electrons = 6
Number of neutrons = 8
Unknown:
Mass number = ?
Solution:
The mass number of an atom is the sum of protons and neutrons in an atom;
Mass number = number of protons + number of neutrons
Mass number = 6 + 8 = 14
What information do the reduction potentials of two elements give about a
redox reaction between those elements?
A. Which element will be oxidized and which will be reduced
B. The electronegativity difference between the two elements
C. Whether electrons will be gained or lost by the oxidized atom
D. Which element is more commonly found in nature
The information that the reduction potentials of two elements give about a redox reaction between those elements is which element will be oxidized and which will be reduced. The correct option is A.
What is a redox reaction?Redox reactions include a change in the oxidation state of the substrate. Loss of electrons or a rise in an element's oxidation state is considered to be oxidation.
Gaining electrons or lowering an object's or its atoms' oxidation state are both considered reductions. A chemical reaction known as an oxidation-reduction (redox) reaction includes the exchange of electrons between two substances.
The reduction potential tells about the element that will be oxidized ad which will be reduced in the redox reaction.
Thus, the correct option is A. Which element will be oxidized and which will be reduced.
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Answer:
Option (A)
Which element will be oxidized and which will be reduced
Explanation:
Hopes this helps.
Which is the best example for genetic diversity?
Answer:
Genetic Diversity Examples
Different breeds of dogs. ...Different varieties of rose flower, wheat, etc.There are more than 50,000 varieties of rice and more than a thousand varieties of mangoes found in India.Genetic diversity is the total number of genetic characteristics in the genetic makeup of a species, it ranges widely from the number of species to differences within species and can be attributed to the span of survival for a species.
Explanation:
i hope this helps u.
M=DxV is a formula for finding*
Answer:
Density
Explanation:
Density of a substance is the mass per unit volume of the substance.
Mass is the amount of particles contained in a matter
Volume is the space occupied by the substance;
To find density, we simply use;
Density = [tex]\frac{mass}{volume}[/tex]
So;
Mass = Density x Volume
From;
M = D x V
M is the mass
D is the is the density
V is the volume
Can a closed system have a physical change or chemical change or both
answer is both physical and chemical changes
HELP!!!
IF YOU DONT KNOW THE ANSWER THEN PLEASE DONT ANSWER!!
Answer:
1. melting
2. freezing
5. condensation
6. evaporation
Their was a watch and learn assignment and I wasn’t paying attention and we had questions so if you guys have ever done this before please help me out. You can’t answer if you haven’t your teacher conduct this experiment or if you have answers from a friend or something
NEED HELP!!! Thank u!!!!
Answer:
D
Explanation:
the correct answer is d
Answer:
d
Explanation:
Its just seem like NaCl structure
Jasmine is doing an experiment to see how much temperature change occurs when three different substances are heated. Between the three conditions, she must control (keep the same) all of the following EXCEPT:
Answer:
SUBSTANCES
Explanation:
According to this question, Jasmine is conducting an experiment in order to see how much temperature change occurs when three different substances are heated. Based on this experiment, the INDEPENDENT VARIABLE, which is the variable that is changed or manipulated is SUBSTANCES.
A controlled experiment is an experiment where all other variables except the INDEPENDENT VARIABLE is kept the same or unchanged. The independent variable is the only variable allowed to change, which in this case is the SUBSTANCES USED.
Calcium metal reacts with hydrochloric acid (HCl) to form aq calcium chloride and hydrogen gas.
Ca(s)+2HCl(aq) -----------> CaCl2(aq)+H2(g)
0.401 g of calcium metal is reacted with 0.350L of 0.0400M hydrochloric acid.
(a) Write the complete ionic equation of the reaction.
(b) Calculate the moles of calcium and hydrochloric acid.
(c) Identify the limiting reagent.
(d) Assuming complete reation, determine the moels of excess reagent that reamains in the reaction.
Answer:
a. Ca(s) + 2H⁺ → Ca²⁺ + H₂(g)
b. 0.0100 moles Ca; 0.0140 moles HCl.
c. HCl is limiting reactant.
d. 0.0030 moles of Ca
Explanation:
a. In water, HCl dissociates in H⁺ and Cl⁻ and CaCl₂ in Ca²⁺ and 2 Cl⁻. The ionic equation is:
Ca(s) + 2H⁺ + 2Cl⁻ → Ca²⁺ + 2Cl⁻ + H₂(g)
Ca(s) + 2H⁺ → Ca²⁺ + H₂(g)b. Moles Ca -Molar mass 40.1g/mol-:
0.401g * (1mol / 40.1g) = 0.0100 moles Ca
Moles HCl:
0.350L * (0.0400mol / L) = 0.0140 moles HCl
c. In the reaction, 1 mole of Calcium reacts with 2 moles of HCl.
For a complete reaction of 0.0100 moles of Calcium there are necessaries:
0.0100mol Ca * (2 mol HCl / 1 mol Ca) = 0.0200 moles HCl
As there are just 0.0140 moles of HCl,
HCl is limiting reactant
d. For a complete reaction of 0.0140 moles of HCl, the moles of Ca that react are:
0.0140 moles HCl * (1 mol Ca / 2 mol HCl) = 0.0070 moles Ca
That means will remain:
0.0100 moles - 0.0070 moles:
0.0030 moles of Ca
Write the net ionic equation for the reaction of aqueous copper(II) chloride with aqueous sodium phosphate. Remember to include the states of matter.
Answer:
3 Cu²⁺(aq) + 2 PO₄³⁻(aq) ⇒ Cu₃(PO₄)₂(s)
Explanation:
Let's consider the molecular equation between aqueous copper(II) chloride and aqueous sodium phosphate.
3 CuCl₂(aq) + 2 Na₃PO₄(aq) ⇒ 6 NaCl(aq) + Cu₃(PO₄)₂(s)
The complete ionic equation includes all the ions and insoluble species.
3 Cu²⁺(aq) + 6 Cl⁻(aq) + 6 Na⁺(aq) + 2 PO₄³⁻(aq) ⇒ 6 Na⁺(aq) + 6 Cl⁻(aq) + Cu₃(PO₄)₂(s)
The net ionic equation includes only the ions that participate in the reaction (not spectator ions) and insoluble species.
3 Cu²⁺(aq) + 2 PO₄³⁻(aq) ⇒ Cu₃(PO₄)₂(s)
On the periodic table, gold has the atomic number 79. This means that
Answer:
it has 79 protons
Explanation:
the atomic number is equal to the number of protons an element has.
On the periodic table, gold has the atomic number 79. This means that the gold has a total of 79 protons present inside its nucleus, as the number of protons signifies the atomic number.
What is the atomic number?The total number of protons present in an atom is known as the atomic number of that atom.
The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom
The current periodic table divides elements into groups according to their increasing atomic numbers.
The atomic number of gold is 79 on the periodic table. This indicates that the gold's nucleus has 79 protons in total, where the number of protons represents the atomic number.
Learn more about the atomic number from here,
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someone help me with chemistry on my account/page please :))
Answer:
ok
Explanation:
PLEASE HELP QUICKLY!! Which statement best describes all minerals?
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure, that occurs naturally in pure form.
hope this helps
A duck migrates South for the winter about 3000 miles each year. It takes them about 65 hours to travel this distance. What is the velocity of the duck?
Answer:
46.15
Explanation:
What statement best describes what a circle graph shows?
A. The average of a data set
B. A frequency distribution
ООО
C. The relationship between two variables
D. Data as proportions of a whole
β-Myrcene, a key intermediate in the production of several fragrances, is 7-methyl-3-methylene-1,6-octadiene.Draw the structure of this triene.
Answer:
this is the structure of beta myrcene but im notsure which structure you were looking for
Sal drew the electron dot diagram as shown.
How should Sal correct diagram?
Answer:
Answer: He should add a single dot below the symbol to correct the electron dot diagram of an aluminium atom.
Explanation: Electron dot structures are the structures in which valence electrons around an atom are shown. The electrons are represented as dots in these structures.
Aluminium is the 13th element of the periodic table.
Electronic configuration of Aluminium is given by:
Valence electrons of aluminium = 3
In the given image, 2 valence electrons are shown and total number of valence electrons are 3. So, in order to correct the diagram, he should add a single electron below the symbol.
Explanation:
yes giuve me brainliest
A child and his mother both have blue eyes. They both have blue eyes because inherited traits of an organism are governed by the -
A. chromosomes found in the genes
B. nucleus found in the chromosomes
C. genetic material found in the nucleus
D. genes found in the cytoplasm
Answer: the answer is C hope it helps
Explanation:
. A pipet is a type of glassware that is used to deliver a specified volume of liquid. A 5 mL pipet has major scale divisions marked for every milliliter and minor scale divisions marked for every 0.1 mL. What is the uncertainty (in mL) made using this pipet? Would it be proper to report that the pipet was used to deliver 3.2 mL of liquid? Explain why or why not
Answer:
Measure of uncertainty thousands place or .01 mL
Yes it would be proper.
Explanation:
measure of uncertainty is when you as the user have to guess, since the pipette has marks every 0.1 ml then you can guess that the liquid is in between the marks or maybe closer to one mark then the other.
Dry ice is carbon dioxide in the solid state. 1.28 grams of dry ice is placed in a 5.00 L chamber that is maintained at 35.1°C. What is the pressure in the chamber after all of the dry ice has sublimed? Assume ideal gas behavior.
Answer:
0.15atm
Explanation:
Given parameters:
Mass of dry ice = 1.28g
Volume of chamber = 5L
Temperature = 35.1°C = 35.1 + 273 = 308.1K
Unknown:
Pressure in the chamber = ?
Solution:
As we assume ideality for the gases in the cylinder, we use the equation below to solve the problem;
PV = nRT
P is the pressure
V is the volume
n is the number of moles
R is the gas constant = 0.082atmdm³mol⁻¹k⁻¹
T is the temperature
Let us find the number of moles;
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Number of moles of CO₂ = [tex]\frac{mass}{molar mass}[/tex]
Number of moles of CO₂ = [tex]\frac{1.28}{44}[/tex] = 0.03moles
So;
Input the parameters and solve;
P x 5 = 0.03 x 0.082 x 308.1
5P = 0.73
P = [tex]\frac{0.73}{5}[/tex] = 0.15atm
