Answer
800g
Explanation:
((11.34-9.63)/11.34) 100.00
Perform the following operations giving the proper number of a significant figure in the answer
Basically I need to round it and I don’t know how to please help
Answer:
15.1
Explanation:
(11.34 -9.63)/11.34)0100.00
(1.71/11.3) X 100.00
0,151 X 100.0 = 15.1
how do ion-ion bonds, ion-dipole bonds and van der wall forces affect boiling or melting of substances?
Hot metal (85 °C) is placed in water (20 °C). When the system reaches thermal
equilibrium, the temperature is 22.25 °C. Why is the temperature at thermal equilibrium
so close to that of water's initial temperature?
The equilibrium temperature is close to the initial temperature of water because water has a greater heat capacity compared to the hot metal, and it will require more energy to raise the low temperature of water.
The given parameters;
initial temperature of the hot metal, t₁ = 85 ⁰Cinitial temperature of the water, t₂ = 20 ⁰Cequilibrium temperature of the mixture, t = 22.25 ⁰CAccording to principle of conservation of energy, the heat lost by a hot body is equal to heat gained by a cold body.
[tex]Q_{hot} = Q_{cold}[/tex]
The equilibrium temperature is close to the initial temperature of water because water has a greater heat capacity compared to the hot metal, and it will require more energy to raise the low temperature of water.
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Where is a alcohol thermometer used?
Explanation:
Ethanol-filled thermometers are used in preference to mercury for meteorological measurements of minimum temperatures and can be used down to −70 °C (−94 °F). The physical limitation of the ability of a thermometer to measure low temperature is the freezing point of the liquid used.
rays with short wavelengths that are the least penetrating, produce chemical effects, and kill germs are
Answer:ultraviolet rays
Explanation:
covalent bond of N and S
Answer:
Covalent bond between identical atoms
Covalent bonds occur between identical atoms or between different atoms whose difference in electronegativity is insufficient to allow transfer of electrons to form ions. ... The two hydrogen atoms are attracted to the same pair of electrons in the covalent bond.
10 What is a characteristic of all living organisms?
A breathing
Begestion
C
excretion
D ingestion
Answer:
D - ingestion
Explanation:
what is the wavelength of radio waves that have a frequency of 3.20 x 1010 hz?
Answer:9.38 x 10^−3 m
Explanation:
Answer: 9.38 x 10^−3 m
Explanation:
Carbon monoxide (CO), carbon dioxide (CO2) and nitrogen dioxide (NO2) are low molecular weight covalent compounds. Which of the following best describes the state in which these compounds exist at Standard Temperature and Pressure (STP)?
solid
liquid
gas
plasma
Answer:
gas
Explanation:
at Standard Temperature and Pressure Carbon monoxide (CO), carbon dioxide (CO2) and nitrogen dioxide (NO2) exist as gases
Option C is correct
Low molecular weight covalent compoundsCovalent compounds are compounds that are characterized by strong Intra-molecular bonds and they are solids as they have higher molecular weights
But when compounds like Carbon monoxide (CO), carbon dioxide (CO2), and nitrogen dioxide (NO2) are formed with low molecular weight covalent bonds They exist as gases
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tijuan mixed a solid and a liquid together in a beaker
Which of the following is matter in its solid form?
O Air
O Electricity
O Rock
O Water
Explain why the invention of the microscope led to the discovery of cells.
Answer:
Because people can now see microscopic items
Explanation:
People can now see the cells because they are so small we cant see them with the enhanced microscope we can see everything that's micro
Which definition bests describes an hydrogen bond?
(a) A bond between an highly electronegative element and hydrogen
b.A bond between two non-metals
c.A bond between a metal and a non-metal
d.A bond involving sharing of electrons
Determine the mass of 10g of CaCO3
Answer:
= 100u. Hence 10 g = 0.1 mole. Hope it's helpful to u
the properties of a substance that can be observed without altering its identify physical property. true false ?
Answer:
True
Explanation:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points.
What is the most common injury caused by working with machines unsafely?
Answer:
The most common injury caused by working with machinery are cuts and burns.
Explanation:
Cuts and burns are the most common injury caused by working with machines unsafely.
What is injury?Any physiological harm to living tissue brought on by acute physical stress is referred to as an injury. An injury can be brought on by a blunt trauma, a piercing trauma, burning, exposure to chemicals, asphyxiation, or overexertion, and it can also happen accidentally. Any area of the body can become injured, and each injury has a unique set of symptoms.
Major injuries are normally treated by a medical practitioner, and the type of treatment depends considerably on the injury. The most frequent reason for accidental human injury or injury-related death is traffic crashes. Chronic conditions are different from injuries. Cuts and burns are the most common injury caused by working with machines unsafely.
Therefore, Cuts and burns are the most common injury caused by working with machines unsafely.
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What is the molarity of 6 moles (mol) of NaCl dissolved in 2 L of water?
O A.
2 mol
6L
ОВ.
6L
2 mol
O c.
6 mol
2L
O D.
2L
6 mol
Answer:
C: [tex]\frac{6 mol}{2 L}[/tex]
Explanation:
we can use the molarity equation
[tex]M = \frac{mol}{L}[/tex]
so to find M we plug in what we know, which is 6 moles of NaCl and 2 L of water, which gives us:
[tex]\frac{6 mol}{2 L}[/tex]
Answer:6 mol/2L
Explanation:just took the quiz
In a compound, chemical energy is _______________ when bonds break.
Answer:
In a compound, chemical energy is _____required__________ when bonds break.
Carbon tetrachlordie (CCI4) is ___
A. iconic
B. Covalent
Which item is a good example of potential energy?
A thrown baseball
O Electricity
O A rock
A battery
Plz help it’s for chemistry!!
Answer:
Oxygen is negative charge
Explanation:
And The 2 Hydrogens are positive charges
Mike mixes two chemicals in a container. The container quickly becomes very hot.
What can be said about this reaction?
Answer:
It is a exothermic reaction.
Explanation:
Exothermic reactions release energy to their surroundings.
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An atom's Lewis dot structure has three dots. Which of the following elements could it be, and why? (4 points)
Group of answer choices
Aluminum, because it is in group 13 and has three valence electrons.
Lithium, because it is a group 1 element with three total electrons.
Magnesium, because it is in period 3 and has three valence electrons.
Potassium, because it is an alkali metal and has three inner shell electrons.
Answer:
Aluminum, because it is in group 13 and has three valence electrons.
The formation of molecule can easily be shown by drawing Lewis dot structure. Since atom's Lewis dot structure has three dots. So Option A is correct option.
What is Lewis dot structure?Lewis dot structure is a way to represent the valence electron of an element in the form of dot. These are mainly beneficial in understanding the chemical formula of covalent compound.
It is given that the Lewis dot structure of molecule contain only 3 electron. That means that element contains 3 electrons in its valence shell.
Aluminum's electronic configuration is 2,8,3
Lithium's electronic configuration is 2,1
Magnesium's has electronic configuration as 2,8,2
Potassium's electronic configuration is 2,8,8,1
Thus Aluminum is the only element that has 3 electron in its outermost shell So, Option A is correct option
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SnO is a different compound than SnO2. What is the difference regarding the cation?
Answer:
Sn has a different charge in each of the compounds.
+2, +4 charges, respectively.
Explanation:
SnO has subscripts of 1, which means it takes only one of each element to make the compound.
We know that oxygen's charge is -2 from the periodic table.
In order for the compound to be neutrally charged,
Sn + O = 0
Sn - 2 = 0.
So, Sn has a +2 charge.
Likewise with the second compound, we know O has a -2 charge.
Sn + 2*(-2) = 0
Sn - 4 = 0
Sn = +4
+2 and +4 are different charges on the Sn cation.
mmmmmmmmmmmmmtyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
Answer:
Yes.
Explanation:
Answer:
=0=0==00=0=0=
Explanation:
can i have Brainliest i need 1 more
how is a standard hydrogen atom different from a hydrogen ion?
Answer:
a hydrogen ion will have more or fewer electrons than a standard hydrogen atom.
Explanation:
ions are atoms that have lost or gained elections. this applies to ions in general.
The number 1x10^100 is called a googol. Write the number 50 googols in standard form.
Answer:
Explanation:
50 * 10^100 is 50 googols in scientific notation... but
come on, who would write that in standard form...
In making a pizza, which process involves a chemical
change?
o mixing spices for the sauce
o slicing pepperoni for the topping
o spreading cheese on the pizza
o baking the dough to form the crust
Answer:
baking the dough to form the crust
In making a pizza, the process that involves a chemical change is baking the dough to form the crust.
What is chemical change?Chemical changes occur when a substance combines with another to form an entirely new substance.
During a chemical change there is a formation of an entirely new product different from the original product.
Thus, In making a pizza, the process that involves a chemical change is baking the dough to form the crust.
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what are the basic postulates of kinetic molecular theory?
Answer:
Five Postulates of KMT.
Gas particles travel in straight lines unless they collide with other particles or the walls of the container.
Gas particles have negligible volume compared to the free space between them..
Molecular collisions are perfectly elastic and kinetic energy is conserved.
Gas particles experience negligible intermolecular forces, there are no attractive or repulsive forces between particles.
The average kinetic energy of the particles in a sample of gas is proportional to the absolute temperature.
The fifth postulate is very important to note as it relates kinetic energy to temperature.
For a gaseous particle most of the kinetic energy is in translation.
don’t mind the bottom part just that question ! :)
Answer:
the charge of an atom is shown with a superscript
