Answer:
Zinc oxide is used in the manufacture of many products such as paints, rubber, cosmetics, pharmaceuticals, plastics, inks, soaps, batteries, textiles and electrical equipment.
Explanation:
The atomic model that describes an atom as a spherical object containing a certain number of electrons trapped in a mass of positive charge is often called the ___________ model.
help
What of reaction is Zn + H2S =ZnS + H2
Can a molecular formula ever be the same as an empirical formula? Explain your answer.
Answer:
The molecular formula for a compound can be the same as or a multiple of the compound's empirical formula. Molecular formulas are compact and easy to communicate; however, they lack the information about bonding and atomic arrangement that is provided in a structural formula.
Explanation:
Answer: Hello Luv......
Hope this helps. Please mark me brainest... Anna ♥
Explanation:
The molecular formula for a compound can be the same as or a multiple of the compound's empirical formula. Molecular formulas are compact and easy to communicate; however, they lack the information about bonding and atomic arrangement that is provided in a structural formula.
How many calories of heat were added to 167.9 g of water to raise its temperature from 25oC to 55oC?
Answer:
Q = 5036.9 calories
Explanation:
Given that,
Mass, m = 167.9 g
The temperature raises from 25°C to 55°C.
The specific heat of water,c = 4.184 J/g °C
We need to find the heat added to water. We know that,
[tex]Q=mc\Delta T\\\\=167.9 \times 4.184\times (55-25)\\\\=21074.8\ J[/tex]
or
Q = 5036.9 calories
So, 5036.9 calories of heat is added.
What is the mole ratio of magnesium carbonate to magnesium oxide? MgCO3 →MgO+CO2
a)3:2 b) 1:3 c) 1:1 d) 1:2 e) 2:3
Answer:
d)1:2
Explanation:
What is the measure of the indicated angle? 37∘ 53∘ 180∘ 127∘
Answer:
53∘
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What volume in liters will 50.0g CO occupy? please show work.
Answer:
40.0L is the volume the CO occupy
Explanation:
To solve this question we must assume the gas is at STP. To find the volume of a gas using the moles, temperature and pressure of the gas we have to use:
PV = nRT
V = nRT / P
Where V is volume in liters
n are moles of the gas -Molar mass CO: 28g/mol-
50.0g * (1mol / 28g) = 1.786 moles CO
R is gas constant = 0.082atmL/molK
T is absolute temperature = 273.15K at STP
P is pressure = 1atm at STP
Replacing:
V = 1.786moles*0.082atmL/molK*273.15K / 1atm
V = 40.0L is the volume the CO occupy
find the ratio of the initial volume to final volume if the temperature of the gas is changed from 27°C to 127°C at constant pressure.
Answer: The ratio of the initial volume to final volume for the given gas is 27 to 127 L at constant pressure.
Explanation:
Given: [tex]T_{1} = 27^{o}C[/tex]
[tex]T_{2} = 127^{o}C[/tex]
According to Charle's law, for an ideal gas pressure is directly proportional to the temperature at constant pressure.
So, formula used to calculate the ratio of the initial volume to final volume is as follows.
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{V_{1}}{V_{2}} = \frac{T_{1}}{T_{2}}\\\frac{V_{1}}{V_{2}} = \frac{27}{127}[/tex]
Hence, we can conclude that the ratio of the initial volume to final volume for the given gas is 27 to 127 L at constant pressure.
An element has the atomic number 72. The number of protons and electrons in a neutral atom of this element is
Explanation:
Hi,
The number of protons is equal to the atomic number. The number of electrons in a neutral atom is equal to the number of protons. So, in this case, you have 72 protons and 72 electrons.
I hope this helps :)
If an element has the atomic number 72, then the number of protons is also equal to 72. As it is clearly mentioned in the question that it is a neutral atom, which means the number of protons is equal to the number of electrons which is also 72.
What is meant by an Atomic number?An atomic number may be defined as the number of a chemical element in the modern periodic table through which the elements are systematically arranged in order of increasing the number of protons in the nucleus.
According to the context of this question, the atomic number of every element is always equal to the number of protons it has. While in a neutral atom, the number of electrons is equal to the number of protons. For calculating the number of neutrons, you have to subtract the atomic number from the atomic mass.
Therefore, there are 72 protons of an element whose atomic number is 72. The number of electrons is also 72.
To learn more about Atomic numbers, refer to the link:
https://brainly.com/question/27655686
#SPJ2
Using the ideal gas law, what will be the volume occupied by 1.46 moles of helium at
0.982 atmospheres and 13.0°C? (R = 0.0821 L'atm/mol-K)
Answer:
34.91 L
Explanation:
Ideal gas law -> PV=nRT
convert C to K -> 13+273 = 286
plug numbers in
(.982)V=(1.46)(.0821)(286)
V = 34.91 L
a gas measured a volume 100 mL under pressure of 740 mmHg. What would the volume be under a pressure of 780 mmHg with constant temperature
Answer:
94.87 mLExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we're finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
We have
[tex]V_2 = \frac{100 \times 740}{780} = \frac{74000}{780} \\ = 94.8717...[/tex]
We have the final answer as
94.87 mLHope this helps you
Is oil a reasonable energy source? Why or why not?
Answer:
No, it is not.
Explanation:
Oil is a non-renewable source of energy. ... Burning oil can pollute the air. Much of our oil has to be imported and it is becoming more and more expensive as reserves reduce and imports increase. Producing electricity from crude oil is expensive compared to other fossil fuels such as coal or gas.
*You Can put this in your own words
What is the total volume of water that you have if you calculated that it
weighs 180g?
The division of Earth’s history into smaller units makes up the ____.
Answer:
geologic time scale
hope this helps
have a good day :)
Explanation:
Review the chart of all the domesticated rabbits. The different types of rabbits are listed by their scientific names. If you were a
rabbit breeder, which rabbits could you breed to produce fertile offspring? Explain.
A)
All of the rabbits listed. They are all rabbits.
B)
None of these rabbits. They are all different species.
C)
Any of the cottontail rabbits They are the same species.
D)
Any of the rabbits on the same branch in the chart because that means
they are closely related.
Answer: None of these rabbits listed. they are all different species
Explanation:
I got it right on usatestprep
There are 1 1/2 times the amount of
we need on the planet today
URGENT ! PLEASE ANSWER QUICKLY
Calculate the volume of a NaCl solution that would contain 5.0 g of NaCl and have a molarity of 4.8 M.
Calculate the pH for a solution with a 4.6 x 10-9 M hydronium concentration.
Answer:If we dissolve NaF in water, we get the following equilibrium:
text{F}^-(aq)+text{H}_2text{O}(l) rightleftarrows text{HF}(aq)+text{OH}^-(aq)
The pH of the resulting solution can be determined if the K_b of the fluoride ion is known.
20.0 g of sodium fluoride is dissolve in enough water to make 500.0 mL of solution. Calculate the pH of the solution. The K_b of the fluoride ion is 1.4 × 10 −11 .
Step 1: List the known values and plan the problem.
Known
mass NaF = 20.0 g
molar mass NaF = 41.99 g/mol
volume solution = 0.500 L
K_b of F – = 1.4 × 10 −11
Unknown
pH of solution = ?
The molarity of the F − solution can be calculated from the mass, molar mass, and solution volume. Since NaF completely dissociates, the molarity of the NaF is equal to the molarity of the F − ion. An ICE Table (below) can be used to calculate the concentration of OH − produced and then the pH of the solution.
Explanation:
Answer:
not sure if this is 100% correct but this is what i got first question: molarity=mol/L 5g*1mol/58.44g=5/58.44 =0.085558mol 4.8m=0.085558/L L=0.0178
jiujuan avatar
second question: pH = - log [H3O+] pH= -log [4.6*10^-9] = 8.33724216
Explanation:
what are protons, what is their charge, and where they located?
The following graph shows a decay chain. Which part of the decay will take the most time? the decay of U-238 to Th-234, the decay of Th-234 to Ra-226, the decay of Ra-226 to Po-214, the decay of Po-214 to Pb-206
A- the decay of U-238 to Th-234
right on edge 2021
Answer:
A) the decay of U-238 to Th-234
:)
Explanation:
what can you infer about aspirin’s ester group?
A. It provides aspirin’s pain-killing ability.
B. It makes the compound more digestible.
C. It reduces fevers.
It's B
Answer:
Option B, aspirin’s ester group provides greater digestibility to aspirin
Explanation:
Aspirin ester group has three parts
carboxylic acid functional group (R-COOH) ester functional group (R-O-CO-R') aromatic group (benzene ring)Aspirin is a weak acid and hence it cannot dissolve in water readily. The reaction of Aspirin ester group with water is as follows -
aspirin
(acetylsalicylic acid) + water → salicylic acid + acetic acid
(ethanoic acid)
Aspirin passes through the stomach and remains unchanged until it reaches the intestine where it hydrolyses ester to form the active compound.
i need help with this pls
I know it’s E and A
Explanation: did you count it’s exactly 28, also the electrons are not visible.
Ps: I’m in 5th grade, what grade is this, if my suggestion was correct then holy crackers.
Compare How does the horse's average speed from 60 s to 120 s compare to its average speed from 120 s to 180 s?
Answer:
Explanation:
To compare the average speed, we would need some parameters which you clearly didn't state in your question. However, permit me to manufacture some from thin air.
The formula for average speed is given as
Speed = distance / time
From the question, we have the time, but not the distance moved by the horse. Now, assuming the horse moves a distance of 60 meters, then we can say,
Speed = 60 / 60
Where the difference between the two time, t = 120 - 60 = 180 - 120 = 60
So, from my hypothesized example, the average speed of the horse is 1 m/s
In describing weather completely, it is important to include, among other aspects, air pressure, precipitation, and humidity. Which of the following statements is false?
Wind is the movement of air that results from differences in air pressure.
Precipitation is a form of water that falls to Earth’s surface from the clouds.
Air typically moves from areas of lower pressure to areas of higher pressure.
When the temperature of the air cools to the dew point, the air is saturated, and water droplets will form.
Answer:
The false statement is - Air typically moves from areas of lower pressure to areas of higher pressure.
Explanation:
The wind is the air movement that takes place due to pressure differences or the temperature difference of air. Air moves from the higher pressure area to the lower pressure area. The more the difference will be the faster the air will move to a low-pressure area.
Precipitation is a form of water that falls from clouds to earth, it can be rainfall, snow and other forms. Dew is one of the forms that occur when the air cools down to the dew point and form droplets.
Answer:
Air typically moves from areas of lower pressure to areas of higher pressure.
Explanation:
*At 25 °C, gas in a rigid cylinder with a movable piston has a volume of 145 mL and a pressure of 125 atm. Then, the gas is compressed to a volume of 80mL What is the new pressure of the gas if the temperature is at 30°C?
Answer:
Pressure will increase by the direct ratio of the volume change. Therefore, since volume changes from 145 to 80, pressure will go up by the ratio change 145÷80 times the original pressure 125 kPa. Sure, you can use the more complicated gas law equation PV = nRT but we are only varying volume so the question boils down to the change in one simple variable.
Putting them together we have: 145÷80 x 125 = 226.5625 or just 226 kPa since the accuracy of the figures and the equation are not great.
Please answer all of the examples below!
Answer:
The first one is balanced. The second one is not.
Explanation:
The first one is balanced because there are the same amount of elements on the reactant side as there are on the product side. The second one is not balanced because there are not the same amount of elements on the reactant side as there are on the product side. Therefore, it is not balanced
More Detailed: first example
Reactant side (left of arrow)
H: 2
C: 1
O: 3
Product side (right of arrow)
H: 2
C: 1
O: 3
More detailed: second example
Reactant side:
Na: 1
O: 1
H: 1
C: 1
Product side:
Na: 2
O: 4
H: 2
C: 1
the variables needed to balance this equation is 2,1, 1, 1.
pls help help help!
i give 20 points
pls
Answer:
His name is Harold
Explanation:
When more gas particles are added to the same space, how will the behavior change?
Answer:
The particles move very fast and collide into one another, causing them to diffuse, or spread out, until they are evenly distributed throughout the volume of the container. When more gas particles enter a container, there is less space for the particles to spread out, and they become compressed.
Explanation:
Which of these is not a characteristic of sponges?
lack a backbone
lack a brain
stationary
have a nervous system
in which type of condition is a conditions is a landslide most likely to occur
Answer:
B. In a wet, hilly area
Explanation:
We know that for a landslide to happen, there has to be a down hill slope so it can fall.
This eliminates answers C, D and E.
So we are left with A and B
Now we can look at this in a real life scenario. If you have ever walking on wet ground, you will know that is weaker than dry ground. Knowing this, we know the answer will have to be answer B.
* Describe the structure and behavior of the inner Earth
Answer:
The interior of the Earth, like that of the other terrestrial planets, is chemically divided into layers. The Earth has an outer silicate solid crust, a highly viscous mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core.