Answer:
Earth's climate has changed throughout history. Just in the last 650,000 years there have been seven cycles of glacial advance and retreat, with the abrupt end of the last ice age about 11,700 years ago marking the beginning of the modern climate era — and of human civilization. Most of these climate changes are attributed to very small variations in Earth’s orbit that change the amount of solar energy our planet receives.
Explanation:
i might be right
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a. What is the mass of 3.47x10^26 molecules of CuCl2?
Answer:
77460 g
Explanation:
To solve this problem first we convert molecules into moles, using Avogadro's number:
3.47x10²⁶ molecules ÷ 6.023x10²³ molecules/mol = 576.12 moles
Then we convert 576.12 CuCl₂ moles into grams, using its molar mass:
576.12 mol * 134.45 g/mol = 77460 g
So the answer is 77460 g, or 77.46 kg.
lons form when atoms gain or lose valence electrons. When an atom gains
electrons, it becomes negatively charged, and when an atom loses
electrons it becomes positively charged. Why?
Answer:
In neutral atom number of electrons (negativity charged particle) and number of proton ( positively charged particle) are equal.
When one or more electrons are lost so positive charge particle increases and cation is formed.
For example in Na 11 electrons and 11 protons are present when it loses one electrons protons are 11 and 10 electron are remaining so one positive charge is present.
Morever when an element gain electrons one negative charge increases and anion is formed. For example in Cl 17 proton and 17 electrons are present when it gain one electron 18 electrons and 17 protons are now present one negative is more so anion negative ion is formed.
Explanation:
If I have 5 mols of Neon how many grams of Neon do I have?
Answer:
20.1797 grams.
Explanation:
The molecular formula for Neon is Ne. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Neon, or 20.1797 grams.
Which place describes a community?
A. a desert of sand, rock, hawks, and snakes
B. the desert
C. a forest birds, insects, and squirrels
D. a hole in which a snake lives
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
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 :)
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.
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
balance de CO2 + H2O
Explanation:
6 CO2 + 12 H2O ---->C6H12O6 + 6 O2+ 6 H2O
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.
Which element is a poor conductor of heat?
A. F
B.K.
C. Fe
D. Ag
Mariyam, a marine biologist, measures the length of a great white shark at 4.5 m long and its teeth at an average of 50 mm long. She wants to convert both measurements to centimeters.
What should her new numbers be?
shark length: .45 cm; teeth: 0.50 cm
shark length: 45.0 cm; teeth: 50 cm
shark length: 450 cm; teeth: 5.0 cm
shark length: 4500 cm; teeth: 5.0 cm
I cant figure this out!!
Answer:
Its C. Please mark me brainliest if this helped
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.
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:
I need help with this question
Answer: atomic nucleus
Explanation:
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?
True or false; when something heats up, New energy is created, and when something cool down, Energy is destroyed.
Answer:
This is false.
Explanation:
This statement directly opposes the first law of thermodynamics which states that energy can neither be created nor destroyed, but can transfer from one source to another.
How many grams of Cl2 are needed to produce 2.4 grams of NaCl?
2Na + Cl2 --> 2NaCl
The answer is 0.017110756386119. We assume you are converting between moles NaCl and gram. You can view more details on each measurement unit: This compound is also known as Sodium Chloride. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles NaCl, or 58.44277 grams.
Hope I helped :)
According to the stoichiometry of the given chemical equation, 1.45 g of Cl₂ are needed to produce 2.4 grams of NaCl.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
According to the given chemical equation, 70.906 g of chlorine gives 117 g sodium chloride, thus, 2.4 g of sodium chloride will be produced, when 2.4×70.906/117= 1.45 g of Cl₂ reacts.
Thus, according to the stoichiometry of the given chemical equation, 1.45 g of Cl₂ are needed to produce 2.4 grams of NaCl.
Learn more about stoichiometry,here:
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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:
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
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
Someone please help I don't know if my answers are correct for this
Answer:
Your correct it is false
Why don't we feel the air pressing on us all the time?
Answer: Why don't we feel the air pressing on us all the time?
Explanation:
Because air is a fluid, the weight of the air is transmitted to the palm of your hand and to the back of your hand at the same time. These forces cancel so that your hand overall feels no net force
Answer:the gravity in the atmosphere is pulling all the air so we can survive
Explanation:
bro needs help
32.5 grams of NaOH reacts with an excess of CO2
2NaOH(s) + CO2(g) ⇒ Na2CO3(s) + H20
What is the theoretical yield of Na2CO3 in grams?
*** I NEED YOU TO SHOW YOUR WORK BROS, I ALREADY HAVE THE ANSWER (43.1g) ***
How do the formulas for molecular and ionic compounds differ? Explain the reason for
the difference.
Answer:
How do the formulas differ for molecular and ionic compounds? The formula for a molecular compound represents the atoms that make up one molecule of a compound. The formula for an ionic compound represents one formula unit of the compound. ... Put two electron between atoms to form a chemical bond.
Explanation:
What temperature in Kelvin is 52 degree C?
Answer:
325 K
Explanation:
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!!!!!!!!!!!!!
Is energy part of the system or surrounding?
Answer:
Se Puede Traducir?
Explanation:
Mmm?
Answer:
i think it is surroundings
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
