what method would we use to measure how colour changes during a reaction???
Answer:
There are a number of ways that you could investigate the effect of changing the temperature on the rate of a reaction in Chemistry. ... This includes using apparatus safely, and monitoring chemical changes.
Explanation:
There are three main methods of measuring rate:
measuring the volume of gas given off by a reaction over time.
measuring the loss of mass of a reaction over time when a gas is produced.
Which figures are not significant? *
trailing zeros to the left of an invisible decimal point
leading zeros to the right of a decimal point
leading zeros to the left of a decimal point
all of the above
none of the above
Answer:
leading zeroes to the left of a decimal point. and trailing zeros to the left of an invisible decimal point.
Explanation:
All nonzero digits are significant figures. Example: 713 has three significant figures. 18,991 has five significant figures.Zeros located between two nonzero digits are significant figures. Example: 505 has three significant figures. 17,009 has five significant figures.Zeros at the ends of numbers are only significant if there is a decimal point in the number. Example: 502.00 has five significant figures (5,0,2,0,0). 5020 has three significant figures (5,0,2) 100,000 has one significant figure (1)Zeros that come before the first nonzero digit are not significant. Example: 0.0007 has one significant figure (7). 0.0970 has three significant figures (9,7,0)How do particles differ after a chemical change?
Answer:
The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance. The same number of particles that exist before the reaction exist after the reaction.
The particles of the substance are rearranged after a chemical change.
The difference between a physical change and a chemical change is that in a chemical change, the particles of a substance are rearranged to form a new compound.
This regrouping of particles is really what yields the product. The product is always chemically different from the starting materials.
Hence, the particles of a substance are rearranged during a chemical change.
Learn more; https://brainly.com/question/6284546
Why is the melting of an ice cube an example of a physical change?
A. because a new substance forms
B. because the change is reversible
C. because the melting ice releases energy
D. because the water has different properties than the ice
Answer:
The answer is C because the melting ice releases energy
Explanation:
What is the main point of the reading? Group of answer choices Many elements combine to make a few compounds. Hawaii is made up of only a few types of compounds A few elements combine to make many compounds. Elements cannot be combined except by artificial means.
Answer:
A few elements combine to make many compounds.
Explanation:
The heading of the reading is 'Few elements, many Compounds'. The reading has focused on the process involved in the formation of elements and compounds. In the Hawaiian Islands the elements are found in abundance. These elements combine together to form compounds. The mountains, greenery, rocks and living matter are made up of many elements and compounds. The elements present helps in forming various compounds.
What size volumetric flask would you use to create a 1.25 M solution using 29.75 g of MgCl2?
Answer:
250 ml
Explanation: I got it right on the lab.
The size of the volumetric flask that would you use to create a 1.25 M solution using 29.75 g of MgCl₂ is 250mL.
How do we calculate volume of the solution?
Volume (V) in liter of the solution will be calculated by using the molarity (M) formula as:
M = n/V, where
n is the moles of the solute and it will be calculated by using mass as:
n = W/M, where
W = given mass
M = molar mass
Moles of 29.75g of MgCl₂ = 29.75g / 95g/mol = 0.313 mol
Given that molarity of solution = 1.25M
On putting values on the equation of molarity we will get the value of volume as:
V = 0.313 / 1.25 = 0.2504 L = 250mL
For the preparation of 250 mL of MgCl₂ solution we required the volumetric flask of 250 mL.
Hence volumetric flask of 250mL is required.
To know more about volumetric flask, visit the below link:
https://brainly.com/question/24196698
#SPJ2
The four balls in the diagram below are made of the same material and are solid.
Pair 1
Pair 2
Why is the force of gravity between the balls in Pair 2 greater than the force of gravity between the balls in Pair 12
PI
The balls in Pair 2 are closer together than the balls in Pair 1.
The balls in Pair 2 have a greater mass than the balls in Pair 1.
O The balls in Pair 1 have more rolling friction than the balls in Pair 2.
The balls in Pair 1 have more magnetic force than the balls in Pair 2.
Hidden
Ops
Answer:
The balls in Pair 2 have a greater mass than the balls in Pair 1.
please tell me answers I am given you brainliest
Answer:
1 = one
2 = fluorine
3 = Bromine
4 = increase
5 = first increaseas and then decreases
hope it helps
If I use a plastic comb and run it "vigorously" through my hair, then hold it next to small torn pieces of tissue paper, what would happen?
If I use a plastic comb and run it "vigorously" through my hair, then hold it next to small torn pieces of tissue paper then paper will get attach to the comb.
What is static electricity?Static electricity is a kind of electricity which will observe when transfer of charged particles is observed from one object to another object.
If we use a plastic comb and run it vigorously through our hairs then static electricity is generated due to the transfer of electrons from the atoms present in the hairs towards the plastic comb as a result of which negative charge is bear by the comb and positive charge is bear by the hairs. Then when we hold this comb near a tissue paper then it produces induced charge and show attraction towards the tissue paper.
Hence, when we hold a combed plastic comb near tissue papers then paper will get attach to the comb.
To know more about static electricity, visit the below link:
https://brainly.com/question/65202
Proxima Centauri is the nearest star to Earth, besides the sun. What can you predict about its brightness compared to other stars? A. Proxima Centauri would be one of the brightest stars in the night sky. B. Proxima Centauri would have the same brightness as other stars in the night sky. C. Proxima Centauri would be one of the dimmer stars in the night sky. D. There is not enough information to make this prediction.
Answer:
ITS D
Explanation:
Answer:
I did the test and the answer is A.
describe how the particles in the pot transfer energy
Answer: When they do, they transfer some of their energy. The energy is transferred from particle to particle. It is sort of like a row of dominoes falling over. In this process, thermal energy moves through a substance. It can even move into other nearby substances. In Figure above, conduction occurs between particles of the metal in the pot. It also occurs between particles of the pot
Explanation:
How would you calculate an object’s mechanical energy?
Which of the following shows the conservation of mass during cellular
respiration? *
O 6 H2O + C6H1206 – 6 02 + energy
O C6H1206 +6 02 - 6 CO2 + 6H20 + energy
O 6 CO2 + 6 H20 + energy - C6H1206 + 6 02
O 3 CO2 + 3 H20 + energy - 3 C6H1206 +3 02
Answer:
C6H12O6 + 6O2 - 6CO2 + 6H2O + ENERGY
Explanation:
Let me know if I'm right
Sam ran a 2000-meter race. He started at 9:00 AM and finished at 9:15 AM. He started out fast but slowed down toward the end. Calculate Sam's average speed during the race.
Answer:
Sam's average speed = 2.22 m/s
Explanation:
The average speed refers to the speed with which a distance is covered within a particular time duration. The average speed of a moving object can be obtained by summing up all the varying speeds as the object moves from one point to another, within a particular time frame.
Sams average speed can be calculated using this formula:
Average speed = distance / time
Distance covered = 2000 meters
Time taken to cover the distance = 9:15 am - 9:00 am = 15 minutes = 15 X 60 seconds = 900 seconds
Sam's average speed = 2000meters / 900 secs = 2.22 m/second
Answer: tell me
Explanation:
i do not no
The table below shows the main components of Earth's atmosphere. What is the solvent in air? What are the solutes?
Answer:
The correct answer is - nitrogen is solvent and other gases present in the air are solutes.
Explanation:
As it is given and we know that the earth's atmosphere is made up of various gases including nitrogen, oxygen, carbon dioxide, argon, and water vapor, however, the major part of the atmosphere is made up of nitrogen.
Air is a homogenous mixture of gases and most of the part of the air is, 78.08 percent, nitrogen makes it solvent and other gases mixed with nitrogen are solutes including carbon dioxide and oxygen.
Which plant is considered an invasive species in Shenandoah National Park in Virginia?
es )
A)
Blackberries and raspberries are found blooming along open areas of the
park. These provide food for hungry bears.
B)
The tree-of-heaven is originally from China. It produces a chemical that
prevents other plants from growing around it.
The American chestnut tree was once the most common tree to see in the
park. All of the mature trees of this species are now gone.
D)
Poison ivy can cause red, itchy bumps on a hiker's skin when contact is
made with its leaves. This vine grows naturally from Canada south to
Florida
Ecol
Hint
Answer:
B) The tree-of-heaven is originally from China. It produces a chemical that prevents other plants from growing around it.
Explanation:
In ecology, a plant is said to be "INVASIVE" if it is FOREIGN or NON-NON-NATIVE to a particular region or area and also poses a great threat to the native species of that region. An invasive species, when introduced into a foreign habitat, heavily competes with the existing local species of that same habitat.
This is the case of the tree-of-heaven, which is originally from China. The tree produces a chemical that prevents other plants from growing around it. Note that this plant species is foreign to the Shenandoah National Park in Virginia as it originates from China. Likewise it harms the local or native species of the park by secreting a chemical that prevents other plants from growing around it. This characteristics portrays a plant that is INVASIVE.
A skateboarder traveling at 7.0 meters per second rolls to a stop at the top of a ramp in 3.0 seconds. What is the skateboarder's acceleration? acceleration=[acceleration]m/s2
Answer:
The skateboarder's acceleration is -2.33 m/s².
Explanation:
The acceleration of an object is a magnitude that indicates how the speed of the object changes in a unit of time. That is, acceleration is the change in speed in a unit of time.
Acceleration is calculated as the relationship between the variation or change in the speed of a mobile and the time used for said change:
[tex]acceleration=\frac{change in the speed}{time}=\frac{final speed - initial speed}{time}[/tex]
In this case:
final speed= 0 m/sinitial speed= 7 m/stime= 3 sReplacing:
[tex]acceleration=\frac{0 m/s - 7 m/s}{3 s}[/tex]
and solving you get:
acceleration= -2.33 m/s²
The skateboarder's acceleration is -2.33 m/s².
What is defined as a state of matter with a defined volume and shape?
A. Gas
B. Liquid
C. Plasma
D. Solid
Answer:
gas is the state of matter with a defined volume and shape
is Nb6+ a oxidizing agent?
Answer:
yes
Explanation:
because of high positive charge of Nb6+ delta G is more negative for Nb6+ as an oxidising agent♡
Answer:
So Sn2+ is a reducing agent (oxidises itself to Sn4+ hence becoming stable) while Pb2+ is already stable so it neither undergoes oxidation nor reduction.
2NaHCO3 + 3CaCl2 → CaCO3 + 2NaCl + H2O + CO2
Which statement is true about the equation above?
There are 3 chlorines on the reactant side and 3 chlorines on the product side of this equation.
There are 3 chlorines on the reactant side and 3 chlorines on the product side of this equation.
There are 3 calciums on the reactant side and 2 calciums on the product side of this equation.
There are 3 calciums on the reactant side and 2 calciums on the product side of this equation.
There are the same number of oxygen atoms in the reactants and the products. There are the same number of oxygen atoms in the reactants and the products.
This equation does not follow the law of conservation of mass.
Answer:
There are the same number of oxygen atoms in the reactants and the products
Explanation:
However the equation is not balanced
3 Ca on one side and 1 on the other
Glucose is a molecule that organisms can use to release energy, and that is made of nitrogen, lead, and palladium attoms (true false)
Answer:
true
Explanation:
What is the main purpose of the excretory system?
Question 6 options:
To cause movement of the body
To respond to stimuli
To transport nutrients
To remove waste products
Answer:
To remove waste products
Explanation:
I think
Answer:
to remove waste products
How many moles each element are in a mole of methane?
[tex] \large \mathcal{ANSWER}[/tex]
This means that the mass of one methane molecule is 12.011 u + (4 × 1.008u), or 16.043 u. This means that one mole of methane has a mass of 16.043 grams. A mole can be thought of as two bags of different sized balls. One bag contains 3 tennis balls and the other 3 footballs.
Samples of helium (He), nitrogen (N 2 ), and methane (CH 4 ) are at STP. Each contains 1 mole or 6.02 × 10 23 particles. However, the mass of each gas is different and corresponds to the molar mass of that gas: 4.00 g/mol for He, 28.0 g/mol for N 2 , and 16.0 g/mol for CH 4 .
determine the number of molecules in 43.9 g of carbon tetrachloride
Answer: There are about 0.28 molecules in 43.9 g of carbon tetrachloride. If you are rounding up, it would be 0.3
Explanation:
What’s the answer???
Answer:
Well I know that the first one is true.
Explanation:
Answer:
1. TRUE
2. FALSE
3. C
Explanation:
What’s the answer????
Answer:
1. C
2. A
3. A
Explanation:
name the following compound Mol2
Answer:
you cant answer this
Explanation:
you left something out of the question
Identify two sources of heat that melt rocks beneath Earth's surface.
Answer:
magma, melting
Consider a star with a surface temperature of 12,000
K. According to the graph, the star's peak wavelength
is in the
A) ultraviolet range.
B) radio wave range.
C) visible light range.
D) infrared range.
Answer:
a
Explanation:
Answer:
A. ultraviolet range
Explanation:
1. How are atoms held together? What is the attraction between?
Answer:
the atom is held together by the electrostatic attraction between the positively charged nucleus and the negatively charged electrons surrounding it, the stability within chemical bonds is also due to electrostatic attractions.
Explanation:
Answer:
Some type of bond (example: hydrogen bonds between water)
Polarity can also hold atoms together
hope this Helped!