A 13.5g sample of gold is heated, then placed in a calorimeter containing 60g of water. The temperature of water increases from 19oC to 20oC. The specific heat of gold is 0.13J/goC. What was the initial temperature of the gold metal sample?

Answer:

Mass is lost due to the conversion of mass to energy

Explanation:

The question is not complete, the complete question is given as:

        [tex]^{235}_{72}U +^{1}_{0}n[/tex]                       ⇒        [tex]^{140}_{56}Ba+^{93}_{36}Kr+3^{1}_{0}n+energy[/tex]

total mass equals 236.053 u              total mass equals 235.868 u

Which statement explains the energy term in this reaction? (1) Mass is gained due to the conversion of mass to energy. (2) Mass is gained due to the conversion of energy to mass. (3) Mass is lost due to the conversion of mass to energy. (4) Mass is lost due to the conversion of energy to mass.

Answer: From Einstein’s equation  E = mc², when a radioisotope element undergoes fission or fusion in a nuclear reaction, it loses a tiny amount of mass.This mass lost is converted to energy.

The law of conservation of energy  holds for this type of reaction (i.e  the sum of mass and energy is remains the same in a nuclear reaction). Mass changes to energy, but the total amount of mass and energy combined remains the same before and after a nuclear reaction.

From the reaction above, the total decrease in mass = 236.053 - 235.868 = 0.185 u

Answer:

in plant and animal cells

Explanation:

It happens in both and occurs in the mitochondria.

Answer:

The water tastes sweet, and it usually appears to be cloudy or not clear.

Explanation:

If nothing dissolves into the water, then it should be clear.

Answer:You can tell if the sugar is still there by boiling off the water and leaving the sugar behind in the container. Sugar is a solid, and therefore cannot evaporate, so when the water reaches boiling point, it will evaporate at a quicker rate than before (water evaporates at any temperature in liquid form; just not enough to be noticeable) and leave the container to become water vapour

Explanation: If you stir a spoonful of sugar into hot water, the sugar will dissolve in the hot water. When sugar or another substance is dissolved in water, it disappears from view and forms a homogeneous mixture with the water, also called a solution.

Answer:

540% according to an article I read on BBC

Explanation:

Answer:

An alkane is a hydrocarbon in which there are only single covalent bonds. The simplest alkane is methane, with the molecular formula CH4.

Explanation:

Alkanes.

Name Heptane

Molecular Formula C7H16

Condensed Structural Formula CH3CH2CH2CH2CH2CH2CH3

Boiling Point (°C) 98.5

Hydrocarbons which are alkanes with 4 or more than 4 carbon atoms have more than one possible structural formula which is a type of chemical formula.

Structural formula helps in identifying location of chemical bonds which are present between atoms in a molecule.It consists of symbols of elements for the atoms which are connected by short lines which actually represent the chemical bonds.

Structural formulae can be deduced from molecular formulae the fragment ions are studied in the mass spectrum.It is concerned with the valency which helps in determination of of how atoms a combine in a definite ratio.

Properties of molecules are much related with their structures. It helps in showing the arrangement of atoms in a three-dimensional space.

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Sample Response: An apple is an opaque object because no light can pass through. The red apple reflects red light and absorbs all the other colors

Answer:

4p

Explanation:

3s < 3p < 4s < 4p

This arrangement is in order of increasing energy.

This explains that, 4p is the highest energy level you can reach.

Answer:

Equilibrium shifts left making more NO2

Explanation:

In Le Chatlier's Principle,  increase in volume  shifts equilibrium to side with more moles so... there's 2 moles on left and 1 mole on right, so equilibrium shifts to left making more NO2

According to chemical equilibrium and Le-Chatlier's principle , the equilibrium will shift to left with increase in concentration of NO₂.

Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.

At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.

Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.

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Answer:

In order to calculate the work that the spike did, you have to respect the following equation:

WORK = FORCE X DISPLACEMENT X COS (0)

Explanation:

Work is measured in joules, and is the amount of energy a body needs to make a certain force over a certain distance.

In the case of this bird we would be calculating with the equation written up in the previous item the work that said animal would do to grind a seed.

proton is the name for a nuclear particle that has about the same mass as a neutron, but with a positive charge.

Answer:

C

Explanation:

energy is measures the capacity to do work.

Answer:

C

Explanation:

APEX

Answer: 9.91×10²³ particles

Explanation:

To find the amount of particles, you will need to use the Ideal Gas Law with what we are given.

Ideal Gas Law: PV=nRT

After we find moles, we can use Avogadro's number to convert to particles.

[tex]n=\frac{PV}{RT}[/tex]

P=101.3kPa=1.00 atm

V=4.0 L

T=23°C+273.15=296.15 K

R=0.08206 Latm/Kmol

[tex]n=\frac{(1.00 atm)(4.0 L)}{(0.08206Latm/Kmol)(296.15K)}[/tex]

[tex]n=0.164595 mol[/tex]

Now that we have moles, we can convert to particles.

[tex]0.164595mol*\frac{6.022*10^2^3 particles}{mol} =9.91*10^2^2 particles[/tex]

Hey!!!

The answer of your question is Gas.

Explanations:

Solid have a fixed shape and volume.

Liquid have a definite volume but no definite shape

Gas neither have fixed shape nor a fixed volume.

Hope it helps...

Good luck on your assignment

Answer:

It breaks down food to create energy

Answer:

Redox reactions have a reducing agent and a oxidizing agent

Explanation:the reducing agent is more reactive than the oxidizing agent

Answer:

Atomic number is the number of protons in an atom

Atomic mass is the mass of an atom.

Explanation:

which of the following is the best choice for presenting the relationship between atomic number and atomic mass?

Atomic number is the number of protons in an atom

Atomic mass is the mass of an atom.

Answer:

it should be 310.18 g/mol :)

Answer:

12 moles of CO

Explanation:

According to Avogadro, one mole of a substance, contains the same number of elementary entities as 12g of carbon-12. Now the number of elementary entities (atoms, molecules, ions, particles etc) in any substance is given by the Avogadro's constant.

Now since 1 mole of a substance contains Avogadro's number of atoms, it means that the substance with the highest number of moles will have the highest number of atoms.

With this in mind we can see that 12 moles of CO is expected to contain 72.24 ×10^23 atoms of CO. Hence the answer.

Answer:

c. 11 moles of N2O.

Explanation:

Hello,

In this case, for each substance, we use the Avogadro's number to compute the number of atoms in the given sample:

a.

[tex]atoms \ C=9molCO_2*\frac{1molC}{1molCO_2} *\frac{6.022x10^{23}atoms\ C}{1molC} =5.4x10^{24}atoms\ C[/tex]

[tex]atoms \ O=9molCO_2*\frac{2molO}{1molCO_2} *\frac{6.022x10^{23}atoms\ O}{1molO} =1.1x10^{25}atoms\ O[/tex]

[tex]Total\ atoms=1.1x10^{25}+5.4x10^{24}=1.64x10^{25}atoms[/tex]

b.

[tex]atoms \ Xe=10molXe *\frac{6.022x10^{23}atoms\ Xe}{1molXe} =6.022x10^{24}atoms[/tex]

c.

[tex]atoms \ N=11molN_2O*\frac{2molN}{1molN_2O} *\frac{6.022x10^{23}atoms\ N}{1molN} =1.3x10^{25}atoms\ N[/tex]

[tex]atoms \ O=11molN_2O*\frac{1molO}{1molN_2O} *\frac{6.022x10^{23}atoms\ O}{1molO} =6.6x10^{24}atoms\ O[/tex]

[tex]Total\ atoms=1.3x10^{25}+6.6x10^{24}=2.0x10^{25}atoms[/tex]

d.

[tex]atoms \ C=12molCO_2*\frac{1molC}{1molCO_2} *\frac{6.022x10^{23}atoms\ C}{1molC} =7.2x10^{24}atoms\ C[/tex]

[tex]atoms \ O=12molCO_2*\frac{1molO}{1molCO_2} *\frac{6.022x10^{23}atoms\ O}{1molO} =7.2x10^{24}atoms\ O[/tex]

[tex]Total\ atoms=7.2x10^{24}+7.2x10^{24}=1.44x10^{25}atoms[/tex]

Thus, we notice 11 moles of N2O have the greatest number of atoms.

Best regards.

Answer: Magnet

Explanation:Using a magnet is the best separating technique to be deployed in this case. The nails are easily picked out by just holding a magnet over the sandbox.

Answer:

5.

Explanation:

The pOH is found by subtracting the pH by 14, because the pH and the pOH always add up to 14. So the pOH of a solution with the pH of 9 would be 5.

Hope this helps you out. :)

Answer:159.7grams

Explanation:

(55.85)2+(16)3

159.7grams

Answer:

The correct answer for plato/edmentum is C (159.7g)

Answer:

CaCO3 + 2HCl ---> CaCl2 + H2O + CO2

Explanation:

The reaction between solid calcium carbonate and a mineral acid such as aqueous HCl is a neutralization reaction and occurs with the evolution of CO2 gas.

The balanced equation is given below

CaCO3 + 2HCl ---> CaCl2 + H20 + CO2

The product CaCl2 is water soluble which accounts for why the stain is removed, while CO2 gas escapes away from the reaction surface.

Answer:

CaCO3(s) + 2HCl(aq) -------> CaCl2(aq) + 2CO2(g) + H2O(l)

Explanation:

CaCO3(s) + 2HCl(aq) -------> CaCl2(aq) + 2CO2(g) + H2O(l)

When an acid reacts with a metal carbonate a salt, carbon dioxide and water are formed. Hard water usually contain Ca^2+ in the form of Ca(HCO3)2. Minor heating causes CaCO3(calcium carbonate) to deposit on surfaces through which the hard water passes.

Calcium carbonate reacts with acids to produce a calcium salt, water and carbon dioxide: Calcium carbonate + Hydrochloric acid → Calcium chloride + Water + Carbon dioxide. The carbonate radical breaks up into carbon dioxide and oxygen; the oxygen binds with the acid's hydrogen ions to make water; and a solution of calcium chloride remains.

Answer:

1. Exothermic.

2. Yes, released.

3. 38.65KJ of heat is released.

Explanation:

The equation for the reaction is given below:

2NO2 —> N2O4...... ΔH = –55.3KJ

1. The sign of the enthalpy change, ΔH tells whether the reaction is endothermic or exothermic. Since the sign of the enthalpy change, ΔH is negative, the reaction is exothermic.

2. The negative sign indicate that heat is released to the surrounding. Since the reaction is generally an exothermic reaction, 64.3g of NO2 will also release heat to the surroundings.

3. Molar mass of NO2 = 14 + (16x2) = 46g/mol

Mass of NO2 from the balanced equation = 2 x 46 = 92g.

From the balanced equation above:

92g of NO2 reacted to release –55.3KJ of heat.

Therefore, 64.3g of NO2 will react to release = (64.3 x –55.3)/92 = 38.65KJ of heat.

Therefore, 38.65KJ of heat is released.

Answer:

3. nucleus

Explanation:

The nucleus contains all the genetic information.

Answer:

O, S, Se, Te, Po

Explanation:

O, S, Se, Te, Po are all elements found in group sixteen of the periodic table. Remember that the commonality between all the elements in the same group of the periodic table is that they all possess the same number of outermost electrons. All elements in the same group must have the same number of outermost electrons in their outermost shell.

Now, having six electrons in their outermost shell implies that they readily bond with two other atoms to complete their octet. In accordance with the octet rule. This explains why oxygen bonds with calcium by gaining two electrons in calcium oxide.

Answer: 6.022×10²³ molecules Oxygen

Explanation:

To get molecules, you will need Avogadro's number.

Avogadro's number: 6.022×10²³ molecules/mole

[tex]1mol O *\frac{6.022*10^2^3molecules }{1mol} =6.022*10^2^3 molecules[/tex]

Answer:

C) the components

Explanation:

The term component is referred to as the distinctively recognizable part, piece, of a system that is required to complete a function, in that particular system. Moreover, it carries out a distinguishable and necessary function in the operation of a specific system.  For example, a computer has a number of components that make it whole, and the most essential of them is the Central Processing Unit.

Answer:

c) the components

Explanation:

I took the quiz

Answer:

Hydrogen

Explanation:

A reducing agent is a substance which gives up its electrons to become oxidized. Generally, metals are oxidized (reducing agents) while non-metals are reduced (oxidizing agents).

However, hydrogen which is a non-metal is usually oxidized in the presence of stronger oxidizing non-metals such as fluorine and oxygen.

Hydrogen thus, acts as a reducing agent by giving up its electrons to become oxidized. Even though among all non-metals, Hydrogen has the greatest potential to be oxidized, it is a poor reducing agent compared to reactive metals.

Answer:

Option d is correct

Explanation:

The basis of the VSEPR model of molecular bonding is that to minimize repulsions, electron domains in the valence shell of an atom arrange on their own.

According to VSEPR theory, if there are two electron domains on a central atom, they will be arranged such that the angles between the domains are 180°