Answer:
F=Air
Explanation:
Because I took the test hope it helps
Why a hot cup if water has more thermal energy than a cold cup of water?
Answer:
The hotter the substance, the more its molecules vibrate, and therefore the higher thermal energy
:)
Answer: Hot water has more thermal energy because the particles are farther apart thus they are moving faster. As particles move faster their thermal energy increases.
Explanation: Look in answer
Question 40 (1 point)
Is boron a metal, metalloid, or nonmetal?
Boron is a non metallic element and the only non-metal of the group 13 of the periodic table the elements.
Hope this helps, have a great day!
A balloon takes up 625 L at 0°C. If it is heated to 80°C, what will its new volume be?
Answer:
853.15 L
I hope This is Right!
Apologies if it's not :(
True or False: Different substances, like shortening and soap, will melt at the same temperature. True False
Answer:
false
Explanation:
different things will have different melting points
The mass of an atom is equal to the number of
Neutrons, only
Protons, only
Neutrons plus protons
Electrons plus protons
Explanation:
proton number and neutron number sums up to form the mass number
Answer:
Neutrons & protons
Explanation:
hope it's help..
HELPPPP MEEEEE I NEED THIS TODAY
if the heat of combustion of hydrogen is -285.8KJ,what is the heat of formation of water
Answer:
The heat of formation of H2O(g) is likely to be-242,8KJ.
Explanation:
The heat of formation of H2O(g) will be slightly lower than the heat of formation of H2O(1)as some energy is released during condensation of water vapour to liquid water.
What are uses of metals??
Instructions:
1. Do not give the invalid answer.
2. I want full correct answer with full explanations.
Answer:
Different uses of Metals
Metals are usually very strong, most durable and highly resistant to everyday wear and tear. As such, they have been used since ancient times for a lot of things. And even today with advances in technology and a lot of other things the uses of metals have broadened greatly. Metals even play a key role in the economy. Let’s look at some important and popular metals uses.
In the Construction Industry
In electronics
In medicine
Machinery, Refractory and Automobiles
Decorative products
Other Uses
In the Construction Industry
Metals are the main component in the construction industry. Metals like iron, steel amongst others are the main materials used in construction of buildings and even homes.
In Electronics
Another important application of metals are in electronics. As metals are good conductors of electricity, they are used to making wires and parts for equipments and gadgets that function on electrical current. Popular examples include, TV, mobiles, fridge, iron, computers etc.
In medicine
If you are wondering how, well from a biological perspective metals are found as micro-elements in our bodies. Besides, the presence of metal elements is crucial for several functions like transmission of nerve impulses, oxygen flow, reaction between enzymes etc. Some medicines are therefore liaised with metal compounds to treat certain deficiencies or sickness. Metals like, iron, calcium, magnesium, potassium titanium, and aluminum are used commonly in medicine in the form of antacids.
Apart from this, most of the equipments and tools used are made from metals.
Machinery, Refractory and Automobiles
This is one of the most common use of metals. They are used extensively in manufacturing machines for industries, agriculture or farming and automobiles which include road vehicles, railways, airplanes, rockets etc. Here, the commonly used metals are iron, aluminum and steel.
Besides these, most of the utensils that is used in the kitchen are made from metals like steel, aluminum, and copper. Due to a high temperature withstanding nature metals are preferred the most.
Decorative products
Metals such as platinum, gold, and silver come under the category of precious metals and have high economical value. These metals are widely used in making jewellery sets or for some decorative piece.
Other Uses of Metals
Some other uses and applications of metals are, they play an important role in security as the metals are used in making locks, strong safe, doors etc. Apart from this, furnitures are made from metal these days. Metals also find their uses in the military where they are used to manufacturing weapons and ammunitions. Some metals are used in galvanizing to protect from rusting.
These are some popular uses of metal. To know more about metals, different types, properties of metals and more you can keep visiting BYJU’S or you can also download our app for interesting content and learning experience
14. Energy (heat) is always transferred from ___ energy to ___ energy
A. low kinetic; high kinetic
B. high kinetic; high kinetic
C. high kinetic; low kinetic
D. low kinetic; low kinetic
Answer:i pretty sure it is high to low kinetic
Explanation: because heat or energy travels from hot heat to low heat which heat is the same as kinetic
What is in with those numbers? H2O?
Answer:
hydrogen atom and oxygen atom
Consider the following representation of a reaction mechanism.
Step 1: A+A → C+E (slow)
Step 2: E + B → A+D (fast)
Overall reaction: A + B → C + D
What should appear in the rate law for the reaction above?
A) only A and B because they are reactants in the overall reaction
B) only C and C because they are products in the overall reaction
C) only A because it is the reactant in the rate-determining step
D) only E and B because they are the reactants in the rate-determining step
Answer:
The rate determining step is step 1
Explanation:
In the rate law for the given reaction,
only A appears because it is the reactant in the rate-determining step.So, option C is correct one.
Which step is rate determining steps?The slowest steps is rate determining step of the reaction.It is because in rate determining step the intermediate is formed.What is intermediate ?The short lived species formed in the mechanism of reaction is called intermediate.The intermediates is formed in slowest step because it is unstable species.What is rate law for the reaction?The rate law is also known as rate equationIt is the expression that provides relationship between rate and concentration of the reaction in a chemical reaction.The rate law is determined by the experimentally.If the reaction occurs in multi steps then the rate of the reaction is depends upon slowest step of the reaction.learn about rate law,
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Consider the following reaction:
2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g)
At STP, what is the total volume of CO2 formed when 6.0 liters of C2H6 are combusted?
4 L
24 L
12 L
6 L
Answer:
4L
Explanation:
The first thing to do here is make sure that you have a balanced chemical equation. The equation given to you is actually unbalanced, so focus on writing a balanced version
2
C
2
H
6(g]
+
7
O
2(g]
→
4
CO
2(g]
+
6
H
2
O
(g]
Now, the problem provides you with a mass of ethane,
C
2
H
6
, and asks for the volume of carbon dioxide,
CO
2
, formed by the reaction at STP, Standard Temperature and Pressure.
As you know, STP conditions are defined as a temperature of
0
∘
C
and a pressure of
100 kPa
. Under these specific conditions, one mole of any ideal gas occupies exactly
22.7 L
- this is known as the molar volume of a gas at STP.
So, what this means is that if you know how many moles of carbon dioxide are produced by the reaction, you can use the molar volume of the gas to find the requested volume.
Use the molar mass of ethane to determine how many moles you'd get in that
240.0-g
sample
240.0
g
⋅
1 mole C
2
H
6
30.07
g
=
7.9814 moles C
2
H
6
Now, notice that you have a
2
:
4
mole ratio between ethane and carbon dioxide. Since ethane reacts with excess oxygen, you can assume that all the moles will take part in the reaction.
This means that the reaction will produce
7.9814
moles C
2
H
6
⋅
4
moles CO
2
2
moles C
2
H
6
=
15.9628 moles CO
2
So, if one mole of any ideal gas occupies
22.7 L
at STP, this many moles will occupy
15.9628
moles CO
2
⋅
22.7 L
1
mole CO
2
=
362.4 L
The answer is rounded to four sig figs, the number of sig figs you have for the mass of ethane.
Water contains dissolved oxygen that fish can breathe. Which factor would not increase the amount of oxygen in the water of a fish aquarium?
Answer:Place the water under brighter .
Explanation:
What is the molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution?
Answer:
D
Explanation:
all ya got to do is divide the moles from the solution... so 3.0 divided by 0.25. put it in a calculator
hope this helps
The molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution is 12M.
What is Molarity?Molarity of a given solution is known as the total number of moles of solute per litre of the solution. A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.
Molarity = (No. of moles of solute ÷ Volume of solution in liters)
The unit of molarity is mol L⁻¹.
Molarity is temperature dependent because as temperature changes, volume of the solution also changes.
Given,
3.0 moles of Saline (NaCl)
Volume of solution = 0.25L
Molarity = (No. of moles of solute ÷ Volume of solution in liters)
Molarity = 3 ÷ 0.25 = 12 M
Therefore, The molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution is 12M.
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PLSSS HELP
How is a balanced chemical reaction, like N2 +
3H2 --> 2NH3, similar to a recipe?
Answer: With each input, there is an output, a recipe requires certain ingredients, and certain amounts of each. A recipe calls for measurements, missing something can ruin it, just like a chemical formula, take something out or add something else, you get something completely different. when putting things together to make something you have to make sure what your putting in, will give you the product you want as the output.
Explanation:
Equimolar amounts of Cl2(g) and CO(g) are injected into an evacuated, rigid container, where they react according to the equation below. Cl2(g)+CO(g)⇄COCl2(g) ΔHrxn=−109kJ/molrxn (a) If 7.0 g of CO(g) is consumed in the reaction with excess Cl2(g), how many moles of COCl2(g) are produced? (b) Which element is oxidized in this reaction? Justify your answer in terms of oxidation numbers.
Answer:
0.25 moles of COCl₂ are been produced
The element that is oxidized is C, it changed the oxidation state from +2 in CO to +4 in phosgene.
Explanation:
Equilibrium reaction:
Cl₂(g) + CO(g) ⇄ COCl₂(g)
Let's convert the mass of CO to moles:
7g . 1mol /28g = 0.25 moles
As ratio is 1:1, we can say that 0.25 moles of COCl₂ are been produced.
1 mol of chlorine reacts to 1 mol of carbon monoxide in order to produce 1 mol of phosgene.
Chlorine is been reduced:
Cl₂ + 2e⁻ ⇄ 2Cl⁻
Change the oxidation state, from 0 (ground state) to -1. Oxidation state decreased.
Carbon is been oxidized.
In CO, carbon has +2 as oxidation state. In phosgene the oxidation state is +4. This oxidation state was increased, that's why it has oxidized.
The element that is oxidized is carbon whose oxidation number was increased from +2 to +4.
The equation of the reaction is;
Cl2(g) + CO(g) ⇄ COCl2(g)
We have been told that the chlorine gas is the reactant in excess hence the carbon monoxide is the limiting reactant.
Number of moles of CO = 7.0 g/28 g/mol = 0.25 moles
Since the reaction is 1:1, 0.25 moles of COCl2 is produced.
The element that is oxidized is carbon whose oxidation number was increased from +2 to +4.
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Are humans more similar to trees or bacteria? How do you know?(1 point)
A
Humans are more similar to bacteria because trees cannot move around their environment.
B
Humans are more similar to trees because bacteria are too small to see.
C
Humans are not similar to trees or bacteria. Humans are a special species that is not related to any other species on Earth.
D
Humans are more similar to trees because all plants and animals are part of the same domain.
Answer:
Humans and trees are interdependent - we breathe in oxygen and breathe out carbon dioxide, while trees take in carbon dioxide and release oxygen.
Humans have about a thousand genes similar to those of bacteria, presumably because the genes are so vital that their DNA structure has remained much the same over millions of years of descent from a common ancestor.
Explanation:
how to get over a guy u have liked for a year and 4 months
Answer:
Try to find someone who is interested in you as well as you are with him. But be chill about it and never ever let yourself think your not perfect enough cause you are thee most phenomenal person in the entire planet and there is no one like you, you are special. P.S. there are alot of cute guys out there you just gotta wait until he finds you or you find him.
Explanation:
Answer:
huh
Explanation:
Are humans more similar to trees or bacteria? How do you know?(1 point)
A
Humans are more similar to bacteria because trees cannot move around their environment.
B
Humans are more similar to trees because bacteria are too small to see.
C
Humans are not similar to trees or bacteria. Humans are a special species that is not related to any other species on Earth.
D
Humans are more similar to trees because all plants and animals are part of the same domain.
Answer:
a
Explanation:
Answer:
Option D
Explanation:
A and B both make sense to some level.
For option A,trees can only move while bacteria and humans can both move and locomote so there's that similarity
For option B,humans and plants are not micro organisms but bacteria are so there's that similarity
Option C is just not true
Option D is the right answer thus both humans and animals are eukaryotes
What is correct about solubility of
substances?
Which word should replace the question mark in the diagram?
A) Refraction
B) Reflection
C) Light energy
D) Rainbow
Answer:
Could you provide a diagram?
Explanation:
are absolute temperature and kelvin temperature scale the same thing
Answer:
No they are not the same..
Explanation:
Absolute temperature is the temperature of an object on a scale where 0 is in the lowest possible energy state while the kelvin is a base unit of temperature.
Use the information and table to answer the following question.
A group of students collects data to determine whether compounds were ionic or covalent. They placed each
compound in a small bowl and stuck two open ends of a battery-powered circuit in the compound.
Compound
CO2 (s)
KCI (s)
CaO (s)
SIO2 (s)
Conductive
No
No
No
No
Based on the student's data, can they determine which substances are ionic, and which are
covalent?
A. No, as lonic compounds are only conductive in an aqueous (water) solution.
B. Yes, as all of these compounds are lonic since they are not conductive.
C. No, as covalent compounds are only conductive in an aqueous (water) solution.
C
D. Yes, as all of these compounds are covalent since they are not conductive.
Answer:
d
Explanation
all are compounds
Yes, as all of these compounds are covalent since they are not conductive. Therefore, the correct option is option D.
What is chemical compound?A chemical compound is a material made of several similar molecules (as well as molecular entities) joined by chemical bonds and comprising atoms from various chemical elements.
Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be shattered or new ones created during this process. Yes, as all of these compounds are covalent since they are not conductive.
Therefore, the correct option is option D.
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What is meant by the term chemical bond? What subatomic particles(protons, neutrons, electrons) are most important in bonds?
Explanation:
Chemical Bonding refers to the formation of a chemical bond between two or more atoms, molecules, or ions to give rise to a chemical compound.
The subatomic particles that participate are electrons.
How many molecules are in 5.60 L of oxygen gas
Answer:
5.6L of O2 means we have 0.25 moles of O2. and as 1 molecule of O2 has 2 atoms, so, 1.50575*10^23 molecules will have 2*1.50575*10^23 atoms=3.0115*10^23 atoms of O.
Where are most algae found?
on the surface of lakes
growing on the ocean bottoms
floating on water world-wide
in forests around the world
Answer:
on the surface of lakes
Explanation:
what went wrong with the key
Answer:
omoih
Explanation:
could someone help me!
Consider a cup made of plastic. What are the pros of using plastic?
Answer:
It's cheap to make, and its recyclable
What is the meaning of democracy
Answer:
a system of government by the whole population or all the eligible members of a state, typically through elected representatives. its like everyone has a choiceExplanation:
Answer:
Demorcay is:The form of government of the entire population or of all qualifying members of the state, generally by elected representatives:
Explanation:
Calculate the reaction rate given the following:
After 2 minutes (120 seconds), the concentration of a product was measured to
increase from 0.0012 M to 1.48 M.
1.48 M/s
0.0123 M/s
0.0012 M/s
-0.0123 M/s
Answer:
0.0123 M/s
Explanation:
The reaction rate is the rate at which the reaction takes place and results in an increased concentration of the products. The rate of the reaction is 0.0123 M/s.
What is the reaction rate?
The reaction rate is the increase of the concentration of the product with respect to time in seconds. The rate of reaction is given by,
[tex]\rm rate = \rm \dfrac {\Delta C}{\Delta t}[/tex]
Given,
Change in product concentration = 1.478
Time period = 120 seconds
Substituting values in the above equation:
[tex]\begin{aligned} \rm rate &= \rm \dfrac {\Delta C}{\Delta t}\\\\& = \dfrac{1.478}{120}\\\\&= 0.0123 \end{aligned}[/tex]
Therefore, option B. 0.0123 M/s is the reaction rate.
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