Explanation:
To round to a significant figure:
look at the first non-zero digit if rounding to one significant figurelook at the digit after the first non-zero digit if rounding to two significant figuresdraw a vertical line after the place value digit that is requiredlook at the next digitif it's 5 or more, increase the previous digit by oneif it's 4 or less, keep the previous digit the samefill any spaces to the right of the line with zeros, stopping at the decimal point if there is oneHope it will help you.....Answer:look at the first non-zero digit if rounding to one significant figure.
look at the digit after the first non-zero digit if rounding to two significant figures.
draw a vertical line after the place value digit that is required.
look at the next digit.
Explanation: Google ;DDDD
What is the volume of 19.87 mol of ammonium chloride (NH4CI) at STP?
Explanation:
[tex]19.87mol \times \frac{22.4lit}{1mol} = 445.088lit \: [/tex]
There are three subatomic particles found inside atoms. Two of the subatomic particle have a charge of positive or negative. The one particle that does NOT have a charge is the:
proton
neutron
electron
none of the above
Neutrons don't have a charge. They are neutral
Taking into account the definition of ato, proton, neutron and electron, the correct answer is second option: The one particle that does NOT have a charge is the neutron.
You must know the atom is defined as the smallest particle into which an element can be divided without losing its chemical properties.
Atoms are made up of extremely small particles called protons, neutrons, and electrons. Protons and neutrons are in the center of the atom and form the nucleus, while electrons surround the nucleus.
Electrons have a negative charge, while the charge of protons is positive. The only ones that have no electrical charge are neutrons.
In this way, the atomic nucleus has a positive charge in which almost all its mass is concentrated, while around the atomic nucleus, there are a certain number of electrons, negatively charged.
Finally, the correct answer is second option: The one particle that does NOT have a charge is the neutron.
Learn more:
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Green plants need light in order to survive Structures in the leaves absorb light, which in turn, helps plants make their
own tood
Under which color of light will plants be least likely to make food?
red
blue
orange
green
Answer:
The color of light in which plants are less likely to produce food is green.
Explanation:
Photosynthesis is the process by which plants take advantage of sunlight to convert it into chemical energy, necessary to manufacture their nutrients, their growth and development.
Plants do not absorb all the colors of the light spectrum, since due to their pigments they absorb colors with specific wavelengths. Green plants do not absorb the color green, but reflect it —due to the chlorophyll pigment— which gives the green color to those leaves.
For this reason, the light that plants take least advantage of to produce food is green light.
Other options:
The colors blue, orange and red can be absorbed by the plant, to a lesser or greater degree.
Answer:
it would be green
Explanation:
which statement(s) is/are true about concentrations equilibrium
can someone explain me the chemical equilibrium and the factors//changes effecting it? (mainly the concept of the equilibrium tilting to the left or the right side)
Answer:
In a chemical reaction, equilibrium is achieved when the forward and reverse reactions occur at the same rate.
Equilibrium is influenced by the following:
1) pressure
2) temperature
3) concentration
Bear in mind that CATALYST HAS NO IMPACT ON THE EQUILIBRIUM; IT ONLY INCREASES THE RATE.
PRESSURE:
Only if the reaction's left side contains a greater number of molecules can the pressure be increased in order to boost yield. [tex]{e.g:N}_2+3H_2\rlhar2NH_3[/tex]
Thus, because the left side has four molecules and the right side has two, you should increase pressure to increase yield.
TEMPERATURE:
In order to increase yield, raise the temperature only in ENDOTHERMIC FORWARD reactions.
CONCERNTRATION:
Removing the formed product increases yield.
I hope this helps you
:)
Which of these is NOT true of organelles? *
Organelles perform a certain function for a cell.
Organelles are membrane-enclosed structures in a cell.
Organelles are all the same inside a particular animal.
Organelles are separated from the other parts of the cell.
Answer:
C, organelles can all be different in an animal
Explanation:
Organelles DO perform a certain function for a cell,
Organelles ARE membrane enclosed structures,
and Organelles ARE separated from other parts of the cell
Which substance is a mixture?
- table salt
- gasoline
- aluminum
- carbon dioxide
Answer:
I believe it is Gasoline
Explanation:
What do ferns, gymnosperms, and angiosperms have in common? pls answer
help!
Where is visible light located on the EM spectrum?
A. Right in the middle
B. It isn’t on the EM spectrum
C. All the way to the right
D. All the way to the left
|| ▼ Answer ▼ ||
Option D. All the way to the left
|| ✪ Solution ✪ ||
Visible light sits in the region with ultraviolet (UV) to the left of the spectrum.
see the picture below :
The picture shows exactly where the visible light is located in the electromagnetic spectrum .
that is to the left of the ultraviolet radiation, and to the right of infrared (IR).
Hope this Helps! =)
If you have any queries please ask.
Type the correct answer in the box. Isopropanol (C3H8O) is a key ingredient in some hand sanitizers. Suppose that 127 grams of isopropanol is dissolved in water. The volume of the solution is 1,250 milliliters. What is the molarity of the solution? Refer to the periodic table to help you answer. Express your answer to three significant figures. The molarity of the solution is M.
The molarity of the Isopropanol solution is 1.68 M.
How we calculate molarity?Molarity of any solution can be calculated as:
M = n/V, where
n = no. of moles
V = volume = 1,250mL = 1.250L
For this first we have to calculate the moles of Isopropanol (C₃H₈O), and it can be calculated as:
n = W/M, where
W = mass of C₃H₈O = 127 grams
M = molar mass of C₃H₈O = 60.1 g/mol
Moles of C₃H₈O = 127g / 60.1 g/mol = 2.1 moles
Now, we calculate the molarity of solution by using the above formula and by putting values as:
M = 2.1/1.250 = 1.68 M
Hence, 1.68 M is the molarity of the solution.
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7. A sample has 1.70 moles in a volume of 5.8 Lat 25 C. How many liters would be
required for 1.45 L?
Answer:
i think it would 40
Explanation:
Raj needs to determine the chemical composition of trace evidence like paint and fiber. Which tool would Raj use to do this?
comparison microscope
scanning electron microscope
microspectrophotometer
gas chromatograph
Answer:
gas chromatograph
Explanation:
I took the test and got it right.
Which of these is the best example of a chemical reaction that has a gas as a product?
O A. baking soda in vinegar
O B. liquid wax turns solid
O C. paper shredded
O D. water turns to steam
The best example of a chemical reaction that has a gas as a product is baking soda in vinegar.
What is a chemical reaction?A chemical reaction is one that involves the formation of a new product and is irreversible.
This means that a chemical reaction is characterized by the following:
Evolution of gasTransfer of heatThe reaction between vinegar and baking soda will lead to the formation of gaseous products, hence, it is an example of chemical reaction.
Therefore, the best example of a chemical reaction that has a gas as a product is baking soda in vinegar.
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Properties of metals
Answer:
Physical Properties of Metals :
Metals are lustrous, malleable, ductile, good conductors of heat and electricity. Other properties include: State: Metals are solids at room temperature with the exception of mercury, which is liquid at room temperature (Gallium is liquid on hot days).
Hope this helps! :D
what is the boiling point of water in the celsius scale?
Answer:
100 Degrees C
Explanation:
what is the valency & molecular formula of sulphate?
Explanation:
Let's consider sulphate radical, the chemical formula is given by SO42−. Here we can see there is a -2 charge on SO4, which means it has -2 valency. Now look at the option (a), phosphate can be written as PO43−. There is -3 charge on PO4, that means it has -3 valency.
Explanation:
molecular formula of sulphate ion is SO₄²⁻
and
the valency of sulphate ion is 2.
1. What happens to the density of an object if the volume increases, but the mass stays the same?
Answer:
Its density becomes greater.
Explanation:
If the mass of the object stays the same but the volume of the object decreases then its density becomes greater. ... If the volume of the object stays the same but the mass of the object increases then its density becomes greater.
By definition of density, the density of an object if the volume increases, but the mass stays the same, will decrease.
You have to know that density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
In other words, the density of a material, be it liquid, chemical, or gaseous, is the ratio of its mass to its volume.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
And the higher the volume occupied by a given mass, the smaller the density.
Finally, the density of an object if the volume increases, but the mass stays the same, will decrease.
Learn more about density:
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TRUE
FALSE
What unit of measurement would you use to measure from the Milky Way Galaxy to the Andromeda Galaxy?
Answer:
parsecs
Explanation:
The Sun is at a distance of 8.3 kiloparsecs from the centre of the Milky Way system. When dealing with other galaxies or clusters of galaxies, the convenient unit is the megaparsec (1 megaparsec = 1,000,000 parsecs). The distance to the Andromeda Galaxy (Messier 31) is about 0.76 megaparsec.
Three common acid-base neutralization reactions are shown below.
Which characteristic is shared by all three reactions?
Select one:
All of the base products are classified as strong bases.
All of the reactions are double-replacement reactions.
All of the acid reactants are classified as weak acids.
In neutralization reactions involving acids and bases, the reactions are mostly double-replacement reactions.
Neutralization reactionsReactions involving acids and bases are known as neutralization reactions.
In these reactions, acids and bases exchange ions to form new products.
The exchange of ions is known as a double replacement reaction.
For example:
HCl + NaOH ------------. NaCl + H2O
In the above reaction, HCl and NaOH exchanged ions to become H2O and NaCl respectively.
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Change 6 miles to feet
To describe a solid, you could say (check all correct answers): *
The particles of a solid are attracted to each other
The particles of a solid can move past one another
The particles of a solid vibrate but do not move past one another
A solid has mass and takes up space
Answer:
A solid has mass and takes up space
Which is a example of a solution
Answer:
Salt water
Explanation:
A piece of metal with a mass of 100. 0 grams absorbed 2500 joules of energy. During this time, the piece of metal had a temperature change of 74. 8*C. What is the metals specific heat?
The specific heat of the metal with a mass of 100g that absorbed 2500 joules of energy is 0.33J/g°C
How to calculate specific heat capacity?The specific heat capacity of a metal can be calculated by using the following expression:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of metalc = specific heat capacityc = Q ÷ m∆T
c = 2500 ÷ (100 × 74.8)
c = 2500 ÷ 7480
c = 0.33J/g°C
Therefore, the specific heat of the metal with a mass of 100g that absorbed 2500 joules of energy is 0.33J/g°C.
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can you please help me im kinda in a hurry thank you
4. Myth: An organism's kingdom only describes physical characteristics.
o Fact:
o Evidence:
5. Myth: Mammals and plants don't belong in the same domain.
o Fact:
o Evidence:
please help and thx nwn
Answer:
4. fact
5.fact
I think this is all fact no evidence
Select all the true statements. The conjugate base of a strong acid is a very weak base. The conjugate base of a strong acid is a strong base. The conjugate base of a weak acid is a strong base. The conjugate base of a weak acid is a weak base.
Answer:
- The conjugate base of a weak acid is a strong base.
- The conjugate base of a strong acid is a very weak base
Explanation:
The conjugate base of a strong acid is a very weak base, and the conjugate base of a weak acid is a strong base. These two statements are true.
What is strong base ?It is a substance with the capacity to take a proton out of an extremely weak acid. In water, they can also entirely separate into its ions. Examples include sodium hydroxide and potassium hydroxide (KOH) (NaOH).
The stronger the acid and the weaker its conjugate base are, the higher the Ka. Similar to this, the stronger a material is as a base and the weaker its conjugate acid's acidity, the higher the Kb.
Bases provide a similar problem: a strong base is one that is completely ionized in solution. A weak base is one that is less than 100% ionized in solution. There aren't many strong bases, and any base that isn't on the list is.
Thus, The conjugate base of a strong acid is a very weak base, and the conjugate base of a weak acid is a strong base.
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#SPJ5
Why is water wet??
Only 70%of people know it.
Answer:
yes because wet is water
Answer: Being a liquid, water is not itself wet, but can make other solid materials wet. Wetness is the ability of a liquid to adhere to the surface of a solid, so when we say that something is wet, we mean that the liquid is sticking to the surface of a material.
A sample of oxygen gas is collected over water. The volume of gas
collected is 0.250 L at 26°C and 765 torr total pressure. (Water vapor
pressure at 26°C = 25.22 torr)
How many grams of oxygen gas are collected?
If the oxygen gas collected is the product of decomposition of
potassium chlorate, how many grams of potassium chlorate is
decomposed (assuming 100% yield)?
answer: 0.317g, 0.810g
how do I set the problem up?
A. The mass of the oxygen gas collected is 0.317 g
B. The mass of potassium chlorate that decomposed is 0.81 g
A. How to determine the mass of oxygen collected Volume (V) = 0.250 LTemperature (T) = 26 ˚C = 26 + 273 = 299 KPressure (P) = 765 – 25.22 = 739.78 torr = 739.78 / 760 = 0.973 atmGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?The number of mole can be obtained as by using the ideal gas equation as illustrated below:
n = PV / RT
n = (0.973 × 0.25) / (0.0821 × 299)
n = 0.0099 mole
Thus the mass of oxygen collected can be obtained as follow:
Mole of oxygen = 0.0099 mole Molar mass of oxygen = 32 g/mol Mass of oxygen =?Mass of oxygen = mole × molar mass
Mass of oxygen = 0.0099 × 32
Mass of oxygen = 0.317 g
B. How to determine the mass KClO₃Balanced equation
2KClO₃ —> 2KCl + 3O₂
From the balanced equation above,
3 moles of O₂ were obtained from 2 moles of KClO₃
Therefore
0.0099 mole of O₂ will be obtained from = (0.0099 × 2) / 3 = 0.0066 moles of KClO₃
Thus, the mass of KClO₃ that decomposed can be obtained as follow:
Mole of KClO₃ = 0.0066 mole Molar mass of KClO₃ = 122.5 g/molMass of KClO₃ =?Mass = mole × molar mass
Mass of KClO₃ = 0.0066 × 122.5
Mass of KClO₃ = 0.81 g
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Science pls help help
I answered the question in the photo sent