Answer:
higher temperature, more kinetic energy, more space between particles, higher volume
This is true because increase in temperature kinetic energy increase so molecules move apart and increase volume
Explanation:
what is observed when an iron bar is dipped into a solution
Catalysts, including enzymes, have the role of Select one: a. changing a nonspontaneous chemical reaction to spontaneous. b. lowering the activation energy of a reaction. c. heating up the reactants to make the reaction progress faster. d. changing the pH to a favorable pH for the reaction to progress.
Answer:
Lowering activation energy of a reaction.
Explanation:
Activation energy is the minimum amount of energy required by the reactants just to be converted to products.
Since catalysts increase the rate of reaction, activation complex is reached in short period of time hence activation energy is lowered.
Which of the following is not a sign that chemical reaction has taken place?
a. temperature change
b. formation of a liquid
c. color change
d. formation of a gas
Answer:
a
Explanation:
uh process of elimination
Temperature change, phase change to liquid or gas are all physical changes not chemical reactions. A color change indicates a chemical reaction has taken place.
What is a chemical change?Chemical changes are taking place by the breaking or making of chemical bonds. It results in the formation of a new product which is having different properties than the initial substances.
Physical changes does not involve any change in chemical bond. Phase changes, change in size, shape, conductivity, solubility etc. are physical changes. A change in temperature phase conversion into gas or liquid are all physical changes.
A change in color indicates that a new product is formed there. For example reddish brown rust is iron oxide formed by the reaction of Fe with oxygen. Therefore, option c is correct.
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does the state of matter change in sugar solution
Answer:
yes
Explanation:
the sugar was a solid but after being dissolved in a liquid it changed state
As the sun sets, the temperature of the room decreases. Explain how this affects the particle motion of the gas particles in the room. Be sure to include collisions, kinetic energy, pressure, and thermal energy in your answer.
Answer:
Heres a very LONG answer-
The real answer:
Its in the kinetic-molecular theory, the temperature of a substance is related to the average kinetic energy of the particles of that substance. When a substance is heated, some of the absorbed energy is stored within the particles, while some of the energy increases the motion of the particles.
An astronomer wants to study celestial objects with the shortest wavelengths. What kind of telescope should the astronomer use for this task?
Answer:
telescope
Explanation:
i took the test
The telescope provide a means to explore the universe. There are different types of telescopes like reflecting, refracting, x-ray, gamma ray, etc. telescopes. The telescope used by the astronomer to study celestial objects with the shortest wavelengths is x-ray or gamma ray telescope.
What is a telescope?An instrument which is used to view the distant objects is defined as the telescope. The higher the magnification of the telescope, the better will be the view. The lens in the front of the telescope is known as the objective lens.
There are two types of telescopes, they are refracting and reflecting telescopes. The refracting telescopes use lenses to focus the light whereas the reflecting telescopes use mirrors.
The X-ray and gamma ray telescopes collect light in the shorter wavelengths. X - ray telescopes help to study the sun, supernova and the other stars. Gamma ray telescope study black holes and pulsars.
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What are the main functions of the human skeletal system?
A To support the body, protect the organs, produce blood cells, and store calcium.
To regulate the composition of body fluids by removing metabolic wastes and retaining a balance of water, salt, and other
nutrients
OcTo regulate and maintain bodily functions by producing hormones and releasing them into the bloodstream.
D. To enable the diffusion of oxygen into the bloodstream and the removal of carbon dioxide from the bloodstream.
Answer:
The answer is A.........
Answer:
It´s letter A
Explanation:
Can someone please help me out
Answer:
a. increases
b. increases
c. decreases
ASAP pleaseeeeeeeeeeeeeeeeeeeeeee and Thankyou
I have no idea how to do this help plz!
What helps your heart beat? Will give brainlist to whoever answers first!!
Answer:
running helps my heart beat
Answer:
Exercise: The easiest and most effective way to achieve a lasting lower heart rate is to do regular exercise. 2. Stay hydrated: When the body is dehydrated, the heart has to work harder to stabilize blood flow. Throughout the day, drink plenty of sugar- and caffeine-free beverages, such as water and herbal tea.
The function of the mitochondria is to obtain and convert energy. What body system has a similar function?
Answer:
The function of the mitochondria is to obtain and convert energy. What body system has a similar function?
Explanation:
Chloroplasts are very similar to mitochondria, but are found only in the cells of plants and some algae. Like mitochondria, chloroplasts produce food for their cells. Chloroplasts help turn sunlight into food that can be used by the cell, a process known as photosynthesis
What is the mass of Li-6 or Li-7
Answer:
mass number- 7 (round it to 7
Explanation:
How many particles would be found in a 12.7 g sample of ammonium carbonate?
Answer:
Answers. 7.8286×10²¹ particles.
Explanation:
The particles present in the sample of ammonium carbonate are [tex]0.7826*10^{23}[/tex] particles. This can be calculated by using number of moles.
Number of moles:It is defined as the given mass over molar mass.
Given mass= 12.7 g
Molar mass of ammonium carbonate= 96.06 g/mol
Number of moles = 12.7 g / 96.06 g/mol
Number of moles = 0.13 moles
One mole:
A mole is the amount (10) of material containing [tex]6.02214 * 10^{23}[/tex] particles.
1 mol = [tex]6.02214 * 10^{23}[/tex] particles
So, 0.13 moles = [tex]6.02214*10^{23}*0.13=0.7826*10^{23} \text{ particles}[/tex]
thus, there are [tex]0.7826*10^{23}[/tex] particles are present in 12.7 g of ammonium carbonate.
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Why is accidental overlap of signals much more common in H-1 NMR than in C-13 NMR?
Answer:
See explanation
Explanation:
Accidental overlap of signals are common in H-1 NMR than in C-13 NMR for the following reasons;
1) 13C has a very low natural abundance compared to H-1
2) 13C nucleus is s many times lesser in NMR sensitivity than H-1 nucleus.
3) As a result of its low abundance, 13C-13C coupling is not common.
4) Longer relaxation times do not give room for integrations.
5) Peaks in 13C spectra mainly consists of single lines.
As a result of all these, 13C-NMR spectra take longer to acquire than H-NMR. Hence, accidental overlap of signals is much more common in H-1 NMR than in C-13 NMR.
help me please i put nine points!
Answer:
eons.
It would be D. An eon.
Can anyone please help me with this????
Please help me.
How do water currents transfer heat different part of the ocean?
Answer:
Energy in the ocean and the atmosphere
Explanation:
Hope this helps!
Which 1-mole sample of atoms requires the least energy to form a mole of positive ions? 1) Ca 2) Ge 3)K 4)Ga
Answer:
K potassium have least ionization energy among these four
Explanation:
Ionization energy values are given in kilo joule per mole
Ca 590
Ge 762
K 419
Ga 579
From above data we can understand stand K has least and Ge has highest ionization energy
Use the graph to determine the instantaneous speed at 2 seconds.
What is the average speed over the entire trip?
Answer:
The instantaneous speed at 2 seconds =
3 m/s
The average speed over the entire trip is
2 m/s
Explanation:
Answer above is wrong and doesn't state anything about the answer, so this is the correct answer hope this helped! :)
Answer:
1.) 3 m/s 2.) 2 m/s
Explanation:
I hope this helps!!
What causes hot air to rise from the pavement on a hot summer day?
Answer:
During the daytime, when the sunlight hits the land surface, it is absorbed, causing the surface to heat up (think about how hot pavement gets on a sunny, summer day). The hot surface then heats up the air near the surface, causing it to rise
Explanation:
Answer:
When sunlight reaches the ground surface during the day, it is absorbed, allowing the surface to heat up (think about how hot pavement gets on a sunny, summer day). The air near the hot surface is then heated, allowing it to rise.
Explanation:
How many cobalt atoms are in 345 g of cobalt
Answer:
[tex]\boxed {\boxed {\sf About \ 3.53 \ *10^{24}atoms \ Co}}[/tex]
Explanation:
To convert from grams to atoms:
Convert grams to moles Convert moles to grams1. Convert grams to moles
First, find the molar mass of cobalt using the Periodic Table of Elements.
Cobalt (Co): 58.93319 g/molNext, use this mass as a ratio or fraction.
[tex]\frac{58.93319 \ g\ Co}{1 \ mol \ Co}[/tex]
Multiply the mass of the given sample (345 grams) by this ratio.
[tex]345 \ g \ Co *\frac{58.93319 \ g\ Co}{1 \ mol \ Co}[/tex]
Flip the fraction so the grams of Cobalt will cancel each other out when multiplying.
[tex]345 \ g \ Co *\frac{1 \ mol \ Co}{58.93319 \ g\ Co}[/tex]
[tex]345 \ *\frac{1 \ mol \ Co}{58.93319 }[/tex]
[tex]\frac{345 \ mol \ Co}{58.93319 } =5.854086636 \ mol \ Co[/tex]
2. Convert moles to atoms
Use Avogadro's Number, which tells us the number of units (in this case atoms) in 1 mole.
[tex]6.022 *10^{23} \ atoms/mol[/tex]Use this number as a ratio or fraction.
[tex]\frac{6.022 * 10^{23} \ atoms \ Co}{1 \ mol \ Co}}[/tex]
Multiply this ratio by the number of moles we found.
[tex]5.854086636 \ mol \ Co*\frac{6.022 * 10^{23 }\ atoms \ Co}{1 \ mol \ Co}}[/tex]
The moles of Cobalt will cancel.
[tex]5.854086636 \ *\frac{6.022 * 10^{23 }\ atoms \ Co}{1 }}[/tex]
[tex]5.854086636 \ *{6.022 * 10^{23 }\ atoms \ Co}[/tex]
[tex]3.52533097*10^{24} \ atoms \ Co[/tex]
3.Round
The original measurement of 345 has 3 significant figures (3, 4, and 5). We must round to 3 sig figs, which is the hundredth place for this measurement.
[tex]3.52533097*10^{24} \ atoms \ Co[/tex]
The 5 in the thousandth place tells us to round the 2 to a 3.
[tex]3.53 \ *10^{24}atoms \ Co[/tex]
There are about 3.53*10²⁴ atoms of cobalt in 345 grams.
Can someone tell me how to identify the number of significant figures?
I solved a molarity word problem and I got the answer 1.138 moles. I need to find the number of significant figures for this number. If you could use 1.138 as an example, that'd be great.
Answer:
Non-zero digits are always significant.
Any zeros between two significant digits are significant.
A final zero or trailing zeros in the decimal portion ONLY are significant. If a number ends in zeros to the right of the decimal point, those zeros are significant.
Explanation:
1.138 has 4 significant figures, which are 1, 1, 3 and 8. The numbers after the decimal point are decimals and are significant figures.
Is cobalt magnetic? pls help
Answer:
no it is not
Explanation:
Which learning theory is based on associative learning?
Answer:
1. Classical conditioning. Classical conditioning is a type of associative learning based on the association between a neutral stimulus with another that is significant for a person or an animal in order to generate a similar response.
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how many cm is 0.375 ft.
Answer:
11.43 cm
Explanation:
Convert 76.8 cm to m.
Answer:
0.768 m
Explanation:
1 cm = 0.01 m
76.8 cm * 0.01 m/ 1 cm
0.768 m
EXPLAIN the steps you would take to complete this conversion problem.
46 lb
1.
Х
1kg
2.2 lb
х
1,000 g
1kg
=_?
~I love Kuroo^^~
Answer:
Next, the lb will be canceled at 2.2 lb and the kg would be canceled at 1 kg. You cross, multiply, then. 46 x 1 x 1000 is 46000, only moving to the decimal point. 1 x 2.2 x 1 will stay the same, so you'd have 46000 over 2.2.
Explanation:
kuroo man <3
Answer:
Next, the lb will be canceled at 2.2 lb and the kg would be canceled at 1 kg. You cross, multiply, then. 46 x 1 x 1000 is 46000, only moving to the decimal point. 1 x 2.2 x 1 will stay the same, so you'd have 46000 over 2.2.
Explanation:
halo
Which of these chemical equations demonstrates the law of conservation of mass?
F. C3H8 + 4 O2 → 3 CO2 + 4 H2O
G. 2 H2 + O2 à 2 H2O
H. H + O à H2O
J. Mn(OH)2 + H3PO4 à 2Mn3(PO4)2 + 2H2O
Answer:h
Explanation:
How many moles are in 5.4x1024 molecules of C4H2F7I, heptafluoro-1-iodobutane? Group of answer choices
Given :
Number of molecules of [tex]C_4H_2F_7I[/tex].
To Find :
How many moles are in given number of molecules.
Solution :
We know, in 1 moles of any element/compound contains [tex]6.022\times 10^{23}[/tex] at atoms/molecules.
So, number of moles in [tex]5.4\times 10^{24}[/tex] molecules are :
[tex]n = \dfrac{5.4\times 10^{24}}{6.022\times 10^{23}}\\\\n = 8.97 \ moles[/tex]
Therefore, number of moles are 8.97 .