Answer:
An impure substance
Explanation:
Substance means: hard surface example: salt,corals,coal.
Rain is-pouring down on you. Your friend asks where so much water
came from. You explain that the water could once have been
a) in a lake.
c) in an ocean.
-b) in-a river.
d) any of the above.
Answer:
D
Explanation:
It could come from anybody of water around you that had some water evaporated.
Why is eating animals to obtain energy considered exothermic
002 (part 1 of 2) 10.0 points
1.5 mol HCl and 3.7 mol NaOH react accord-
ing to the equation
HCl + NaOH → NaCl + H2O.
If the limiting reactant is HCl, calculate the
amount of NaCl formed.
1. 1.9
2. 2
3. 1.1
4. 1.5
5. 1
6. 1.8
7. 1.2
8. 1.3
9. 1.4
10. 1.7
Answer in units of mol.
mol,
Answer:
4) 1.5 mol
Explanation:
Well, the equation is already balanced and the mole to mole ratio of reactants and products are all 1. So if the limiting reactant is HCl and you have 1.5 mol, you do the mole to mole ratio with NaCl and since it is 1 to 1, there'd be 1.5 mol of NaCl.
What is the formula for the compound?
Answer:
the correct answer is CO2 (the last one)
Help!! I’ll mark you Brainliest.!
Answer:
For 5 pts? gimme that
Explanation:
Answer:
Explanation:
if you know what those phrases mean, then you can look them up and draw those pictures you find, as well as add the definition of each.
FeCl3
+
NaOH →
Fe(OH)
+
Naci
-
balance plzzzz help I live give u the brainliest
(BRAINLIEST QUESTION)
Which answer below best describes what the law of Natural Selection is?
Select one:
a.
Natural selection is the process where those members of a species that can survive environmental hardships reproduce the future offspring with their strong characteristics being passed on, thus evolving the entire species.
b.
Natural selection is the process wherein species evolve over time because those members with common traits tend to survive hardships and produce more offspring.
c.
Natural Selection is the law that states the the natural evolution of a species is dependent on the shifts of the environment.
Answer:
I think it's A but I might be wrong
Explanation:
HELP WAAAAAAAAAAAAAAA
Answer:
5. 0.02 seconds
6. (a) 0.0167 seconds
(b) Period in Lebanon is 0.02 seconds and in the U.S 0.0167 seconds. That means that the U.S. has the faster period.
Explanation:
If two atoms have an electronegativity difference of 1.3, what type of bond would form between them?
Select one:a. non polar covalent b. polar covalent. c. ionic
Answer:
I would say iconic bond
Explanation:
The last layer in layered design is _____________. Object Process None of the options Atoms Sub process
The last layer in the layered design is system layer so none of the above is the correct option.
Robotic Process Automation is a software technology that make use of some programs of computer to copy or mimic the behaviors of human when it has access with them. They been use effectively and ensure the work is perfectly done.
There are layers in the Robotic process automation but the last layer is System layer.
They can handle high volume of tasks.
The lowermost layer is associated with individual screen interactions. The lowermost layer in the layered design of Robotic process automation is the component layer or system layer . The Robotic Process Automation and this form technology is in robots creation.
Therefore, The last layer in layered design Is System layer so none of the above is the correct option.
Learn more about Robotic process automation from the link below.
https://brainly.com/question/41671370
what are the relationships among bond order, bond length, and bond energy?
Explanation:
When a bond is strong, there is a higher bond energy because it takes more energy to break a strong bond. This correlates with bond order and bond length. When the bond order is higher, bond length is shorter, and the shorter the bond length the greater the bond energy.
application of electroplating
Answer:
are you interested in tun
Use the pictures below to answer these questions: How does Magnesium become an ion? What is the charge of the Magnesium ion?
Answer:
Explanation:
The bottom picture shows a Mg atom. There are two electrons on the outside ring. When Mg reacts with something, these 2 electrons are given away. The top picture records that fact.
When Brian first sorted out his thoughts, he figured this was the first day after the crash and what did he think would happen next?
It should be noted that when Brian first sorted out his thoughts, the first thing that he thought would happen next is that he would probably be rescued that day.
It should be noted that in Chapter 5 of Hatchet, Brian wakes up in the forest and then, he realized that he was desperately thirsty.
When Brian first sorted out his thoughts, he figured this was the first day after the crash and that he would probably be rescued that day. He believed that he was going to wither up and die if he doesn't get anything that he'll drink.
Learn more about excerpts on:
https://brainly.com/question/21400963
A little help here please
Answer:
Prokaryotic Cells:
- Bacteria
- Unicellular Organisms
- DNA as genetic material
- Ribosomes
- Do not have membrane bound organelles
- Always contain cell wall
Eukaryotic Cells:
- Contains organelles
- Have membrane bound organelles
- Unicellular Organism
- DNA as genetic material
- Ribosomes
- Have loose strand of DNA
- Has nucleus
- Multicellular Organism
- Plant cell
- Animal cell
Explanation:
I have separated them and made the common characteristics in bold. I cannot guarantee that it is correct, these are my educated estimates.
Elements are usually dull, brittle and do not conduct electricity are know as_____.
Points: 46
Answer:
nonmetals. it's one of them
Zn-71 has a half life of 2.4 minutes. If one had 100g at the beginning, how many grams would be left after 12 minutes?
3.125g
Explanation
2.4 minutes = 1 half life
so 12 minutes = 5 half lives (12/2.4)
100g/2 = 50g (1 half life)
50g/2 = 25g (2 half lives)
25g/2 = 12.5g (3 half lives)
12.5g/2 = 6.25g (4 half lives)
6.25g/2 = 3.125g (5 half lives)
Find the actual yield when the theatrical yield is 1.09g and percent yield is 90%.
Choose the best answer.
What is the sum?
2/3+7/15
O 14/15
O1/2
O1 2/15
O3/5
Answer:
1 2/15
Explanation:
2/3 + 7/15 = 17/15 =1 2/15
2. Use the graph below to answer the following questions.
Does this graph represent an endothermic or an exothermic reaction?
How do you know this graph represents that type of reaction?
What is the potential energy of the reactants (PEreactants)?
What is the potential energy of the products (PEproducts)?
What is ΔH of the reaction?
REMEMBER: ΔH = PEproducts - PEreactants
What is the activation energy (Ea) of this reaction?
REMEMBER: Activation Energy = Maximum Energy - PEreactants
Answer:
The graph represents an endothermic reaction.
The products have more energy than the reactants.
80kJ
160kJ
80kJ
160kJ
The given graph is representing an endothermic reaction as the potential energy reactants are lower than that of the products.
ΔH of the reaction and activation energy is 80 KJ and 160 KJ respectively.
What is the endothermic process?An endothermic process can be defined as a process with an increase in the enthalpy H of the system. An endothermic process involves an increase in the temperature of the system.
Whether a process occurs spontaneously depends not just on the enthalpy change but also on the entropy change and temperature.
From the graph, the potential energy of the reactants = 80 KJ
The potential energy of the products = 160 KJ
ΔH of the reaction, ΔH = PE(products) - PE(reactants)
ΔH = 160 -80 = 80 KJ
The activation energy (Ea) of this reaction will be:
Activation Energy (Ea) = Maximum Energy - PE(reactants)
Activation Energy = 240 - 80 = 160 KJ
Learn more about the endothermic process, here:
brainly.com/question/13818956
#SPJ2
Pls help I will give u points pls
Answer:
i think D
Explanation:
Atoms with the same number of protons but with different electrical charges are called:
Answer:
It is called ions
Explanation:
Which element has a greater Ist ionization energy, Phosphorus or Fluorine?
Answer:
phosphorus
Explanation:
Alison observes that when she injects additional gas molecules into a container of gas, the number of collisions in the container (and the pressure inside) increases. She then increases the volume of the container just enough to restore it to its original pressure. Which of the following laws best describes what Alison observed?
A. Amonton's Law
B. Avogadro's Law
C. Boyles Law
D. Charles's Law
E. Dalton's Law
Answer:
Explanait it is not d
NO LINKS!!!
Static electricity is a ____ charge.
A. permanent
B. missing
C. flowing
D. temporary
will give brainlist to a person with correct answers for all (please help me)
1. Explain how is LiCl formed?
2. What is a combination/synthesis reaction
3. What is a decomposition reaction?
4. What is a single-replacement reaction?
5. What is a double-replacement reaction?
6. What are the trends in electronegativity within groups and across periods in the periodic table?
7. Which element has the lowest electronegativity value?
8. How does electronegativity determine the type of bond that atoms will form?
9. What type of bond will form between 2 atoms that have a large difference in electronegativity?
10. What type of bond will form between 2 atoms when the difference in electronegativity is 0.5?
11. Which element has the highest electronegativity value?
12. What does it mean that matter cannot be created nor destroyed in a Chemical reaction?
Answer:
1. LiCi is formed by the treatment of lithium carbonate with hydrochloric acid
2. A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product).
3. Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments.
4. A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction in which one element is replaced by another in a compound
5. Double replacement reactions have two ionic compounds that are exchanging anions or cations.
6. The most electronegative elements are found on the top right of the periodic table.
7. cesium
8. Electronegativity describes the degree to which an atom attracts electrons in a chemical bond. But the electronegativity of two atoms would determine their bond type.
9. ionic bond
10. polar covalent bond
11. fluorine
12. Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change.
Hope i was able to help!!!
how do the densities of crystalline and amorphous polymers of the same material that have identical molecular weights compare?
Name one nutrient indicator and explain how it works.
Answer:
Hi this is Adhira please make me as brainlist
Explanation:
The nutritional status indicators for the CDC Growth Charts include obesity, overweight, underweight, and short stature. Percentiles are used to rank an individual or a group on a growth chart and indicate where either fits in the context of the reference population
A sample of gas occupies 20 mL at -109 degree C. What volume does the sample
occupy at 65 °C?
Answer: V2= 41.2mL
Explanation:
Givens:
* V1= 20ml
* T1 = -109 ⁰C --> K= ⁰C + 273.15 --> 164.15 K
* V2 = ??
* T2= 338.15 K
Use Charles law V1/T1 = V2/T2
Since we are looking for V2 we can rearrange the formula to
V2= (T2 x V1) /T1
V2= (338.15K x 20mL) / 164.15 K
V2= 41.2mL
NOTE:
Temperature should always be in K not in ⁰C or ⁰F
To convert from C to K use
*K= ⁰C + 273.15
Enter your C value in the ( ⁰C ) and you can get K
What is the number of atoms of oxygen in 0.1 mol of CuSO4.5H2O? & explain