Answer:
Sand dunes are created when wind deposits sand on top of each other until a small mound starts to form. Once that first mound forms, sand piles up on the windward side more and more until the edge of the dune collapses under its own weight.
PLEASE HELP ME, 20 POINTS
How many atoms are in 25.00 g of Li.
Question 1 options:
2.393 x 1024 atoms of Li
1.333 x 1023 atoms of Li
2.16 x 1026 atoms of Li
2.17 x 1024 atoms of Li
How many grams is 2.393 x 1024 atoms of Cl
Question 2 options:
70.45 g Cl
140.9 g Cl
140.9 mole Cl
70.45 mole Cl
How many atoms are in 25.00 g of B.
Question 3 options:
1.393 x 1024 atoms of B
1.333 x 1023 atoms of B
2.16 x 1026 atoms of B
2.17 x 1024 atoms of B
How many grams is 2.393 x 1024 atoms of O
Question 4 options:
70.45 g O
140.9 g O
63.58 mole O
63.58 g O
Explanations:
Question 1: Lithium in 20.00+ g is C. or D., but 25.00+ g is D. which means this is the correct option.
I am unsure of Question 2. I don't think it is mole though.
Question 3: Boron in 25.00-30.00 g is B. or D., but 25.00 g would be C.
Question 4: 2.393 x 1024 atoms of Oxygen is 63.58 mole O. I don't know for sure, but I think this is correct.
I am NOT professional. There is a chance I am incorrect. Please reply to me if I've made a mistake.
What happens to a molten ionic substance when an electric current is passed through it
Answer:
When an electric current is passed through a molten ionic compound the compound decomposes or breaks down. The process also occurs for aqueous solutions of ionic compounds. Liquids and solutions that are able to conduct electricity are called electrolytes
Explanation:
Source: the internet
Toothpaste is an alkali. How could you use the toothpaste to show that red cabbage is an indicator?
Answer:
PUT THE TOOTHPAST ON CABBAGE AND CHECK IT OUT AFTER A DAY
A 170.0 g sample of an unidentified compound contains 29.84 g sodium, 67.49
g chromium, and 72.67 g oxygen. What is the compound's empirical formula?
The empirical formula : Na₂Cr₂O₇
Further explanationGiven
170 g sample contains :
29.84 g sodium, 67.49 g chromium, and 72.67 g oxygen
Required
The compound's empirical formula
Solution
mol ratio of elements :
Na : 29.84 : 23 g/mol = 1.297
Cr : 67.49 : 51,9961 g/mol = 1.297
O : 72.67 : 16 g/mol = 4.54
Divide by 1.297
Na : Cr : O = 1 : 1 : 3.5 = 2 : 2 : 7
Suggest why we have discovered more elements today compared to our ancestors 50,000 years ago
Answer:
well, we have so much better and more tech and we are a lot smarter than we were before.
Explanation:
Answer:
We have way more advanced technology than our ancestors and we have a better idea of how the earth was millions of years ago.
Explanation:
You are a nurse giving a patient 0.75 cc per minute of a drug cocktail intravenously . A cc is 1ml of a solution . If the patient needs thr iv for 2 hours how many liters of this solution will you need to prepare
Answer:
90 mL
0.09 Liters
Explanation:
Givens
1 cc of solution = 1 mL
0.75 cc / min needed to go in intravenously.
2 hours needed.
? Liters
Solution
1 hour = 60 minutes
1 hours = 2 * 60 = 120 minutes
rate = 0.75 cc/minute
Liters = rate * time
Liters = 0.75 cc * 120 minutes
Liters = 90 cc
That's not the answer.
1 Liter has 1000 mL or ccs
x Liter has 90 mL
Equation
1/x = 1000 / 90
Solution
Cross multiply
1000x = 90*1 Divide by 1000
x = 90/1000
x = 0.09 Liters.
A student has a mixture of salt and iron filings.
Which property can the student use to separate the different parts of the mixture?
Answer:
aksksks
Explanation:ss
x
zxrkkrkrkkrkkrrkr
WILL AWARD POINTS AND BRAINLIEST
Which of the following is an example of a compound?
Select all that apply
H20
F2
C2H6
Ag
Is the answer H2O and C2H6?
Element X has three electrons in its outermost orbit.
Element Y has seven electrons in its outermost orbit.
What is the chemical formula of the ionic compound
formed by these elements when they react together?
(Use X and Y as the chemical symbols.)
PLEASE SOMEONE EXPLAIN THIS IN DETAIL
Explanation:
element x _ carbon having two shells 2,3
element y _ fluorine atomic no 9 EC 2,7
when carbon react with fluorine it destroyes graphite and form fluorocarbons and thus form covalent bond
hope it helps u
Chem lab report is attached to the question plz help.
Answer: When I opened the doc it didn't work..
Explanation:
In chemical reactions, what does the principle of conservation of mass mean?
HURRY!!!! TIMED!!! WILL GIVE BRAINLIST!!!
A 10.0 g sample containing calcium carbonate (CaCO3) and an unreactive material was placed in excess hydrochloric acid, HCl. A reaction occurred, producing calcium chloride (CaCl2), water, and carbon dioxide. (a) write a balanced equation for the reaction (b) when the reaction was complete, 800 mL of carbon dioxide gas was collected. How many moles of calcium carbonate were used in the creation? (c) How many grams of CaCO3 were used? (d) If there was another contaminant in the sample that was not unreactive, would this have caused the percent yield of carbon dioxide to be higher, lower, or the same, explain your answer.
Explanation:
(a) write a balanced equation for the reaction
CaCO3 + HCl --> CaCl2 + H2O + CO2
The balanced equation is given as;
CaCO3 + 2HCl → CaCl2 + H2O + CO2
(b) when the reaction was complete, 800 mL of carbon dioxide gas was collected. How many moles of calcium carbonate were used in the creation?
From the balanced reaction;
1 mol of CaCO3 reacts to produce 1 mol of CO2
1 mol of CO2 = 22.4 L of CO2
This means;
1 mol of CaCO3 reacts to produce 22.4L of CO2
x mol would produce 800ml (0.8 L) of CO2
1 = 22.4
x = 0.8
x = 0.8 * 1 / 22.4 = 0.0357 mol
(c) How many grams of CaCO3 were used?
Mass = Number of moles * Molar mass
Molar mass of CaCO3 = 100.0869 g/mol
Mass = 0.0357 mol * 100.0869 g/mol = 3.57 g
(d) If there was another contaminant in the sample that was not un reactive, would this have caused the percent yield of carbon dioxide to be higher, lower, or the same, explain your answer.
The same
An un reactive contaminant in the sample is most likely a catalyst. Catalysts only affect the rate of reaction. They do not affect yields of products.
PLEASE HELP!!!!!!!!!!!!!!!!!!!! ASAP!!!!!!!!! Which two elements are mainly found in the inner and outer core?
A. Fe and Ni
B. Fe and Si
C. Ni and Si
D. Ni and C
PLEASE TELL ME WHAT THOSE ABREVIATIONS MEAN ALSO!!!!!!!!!!!!!
Which element is a poor conductor of heat?
A. F
B.K.
C. Fe
D. Ag
The condition of having a small amount of gravity is called _____.
free fall
ISS
microgravity
Answer:
The effects of microgravity can be seen when astronauts and objects float in space. Microgravity can be experienced in other ways, as well. "Micro-" means "very small," so microgravity refers to the condition where gravity seems to be very small.
ANSWER: MICROGRAVITY
why is it important for the appendages of an arthropod to be joined
Answer:
you mean "jointed." jointed appendages give arthropods much greater movement flexibility and range.
How many atoms of silver are in a bracelet that has a mass of 13.94 grams?
Number of Silver atoms : N = 7.8 x 10²² atoms
Further explanationGiven
mass of bracelet : 13.94 g
Required
Number of atoms
Solution
Assuming the bracelet consists entirely of silver
mol of silver :
= mass : molar mass
= 13.94 g : 107,8682 g/mol
= 0.129
Number of atoms :
N = n x No(No = Avogadro's number)
N = 0.129 x 6.02 x 10²³
N = 7.8 x 10²² atoms
Someone please help I don't know if my answers are correct for this
Answer:
Your correct it is false
eseasdasdsadasdadasda
r
Why is air considered a solution?
Answer:Air is a solution made up of many gases. ... There is more nitrogen than any other gas in air, so it is considered the solvent in an air solution.
Explanation:
does a high melting point mean the substance will melt faster or slower?
Answer:
slower...............
.
..
Answer:
it'll melt slower
Explanation:
because it needs to get to a higher temperature ig
Na
Which term describes argon? *
(2 points)
alkali metal
halogen
transition metal
noble gas
Answer:
Argon is a noble gas
Hope this helps
The nucleus of an atom contains ________________________________________.
Answer:
protons(positively charged) and the neutrons (no charge)
Explanation:
Answer:
The nucleus of an atom contains protons and neutrons.
Animals need various nutrients in order to live and grow. Nitrogen, for example, is a nutrient that is needed to form molecules found in genetic material. How do animals obtain nitrogen? A. They eat plants which have absorbed nitrogen from the soil. B. They create nitrogen in their bodies using other nutrients as building blocks. C. They breathe in and absorb nitrogen gas from the atmosphere. D. all of these
Answer:
It's A
Explanation:
Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use.
Scientists say that the solar system formed from______.
Answer:
a rotating disk of dust and gases
Explanation:
brainliest?
Answer: scientists believe that the solar system was formed when a cloud of gas and dust in space was disturbed, maybe by the explosion of a nearby star (called a supernova). ... Squeezing made the cloud start to collapse, as gravity pulled the gas and dust together, forming a solar nebula.
Explanation:
How many moles are in 7.8g of CaO?
This compound is also known as Calcium Oxide. The SI base unit for amount of substance is the mole. 1 grams CaO is equal to 0.017832495800447 mole. Note that rounding errors may occur, so always check the results.
Hope I helped :)
what type of bond is Cl and Br?
Answer: Polar bond
Explanation:
balance de CO2 + H2O
Explanation:
6 CO2 + 12 H2O ---->C6H12O6 + 6 O2+ 6 H2O
NEED HELP ASAP WILL GIVE BRAINLYEST Organisms that are made up of prokaryotic cells are NOT ____________. Multicellular All of these are true about prokaryotic cells Simpler than organisms made up of Eukaryotic celled organisms Bacteria
Explanation:
the answer is that prokaryotic cells are not multicellular
Is energy part of the system or surrounding?
Answer:
Se Puede Traducir?
Explanation:
Mmm?
Answer:
i think it is surroundings
