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C1 Progress quiz: Atomic structure 2 - test
4 The atomic radius of a silicon atom is 1.1 x 10-10 m. Calculate its atomic radius in
nanometres.
O
11 nm
o
0.011 nm
0.11 nm
1.1 nm
Answer:
0.11 nm
Explanation:
1.1 x 10-10 m
The goal is to convert the atomic radius from meters (m) to nanometres (nm). We do this by multiplying the value by 10^9.
This is given as;
[tex]1.1 * 10^{-10} * 10^{9}\\1.1 * 10^{-10 + 9}\\1.1 * 10^{-1}\\0.11[/tex]
Round the following number to
3 significant figures:
3,545,530
The concept of significant figures are mainly used by scientist and engineer to know the significance of digits in a measurement. Therefore, 3,545,530 upto 3 significant figures is 3.54 x 10³.
What is significant figures?Significant figures are the figures that indicate the degree of accuracy of a value. It tells about the precision of a value. It gives an idea about the digits that are necessary to indicate the experimental value.
Rules for counting significant figures are:
Number between 1 to 9 is always significant
Zeroes after a number has got no significance
Zeroes before a number has got no significance
Zeroes between number has got significance
3,545,530 upto 3 significant figures is 3.54 x 10³.
Therefore, 3,545,530 upto 3 significant figures is 3.54 x 10³.
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_________deep-sea currents that occur because of differences between the salinity and temperature characteristics of water masses
Lesson 2.12
Question 3 options:
Density
Thermohaline currents
Salinity
Polar ice caps
Answer:
its B) Thermohaline currents Sorry if its wrong but im sure this could be it
Explanation:These deep-ocean currents are driven by differences in the water's density, which is controlled by temperature (thermo) and salinity (haline). This process is known as thermohaline circulation. In the Earth's polar regions ocean water gets very cold, forming sea ice.
Thermohaline currents deep-sea currents that occur because of differences between the salinity and temperature characteristics of water masses
What is thermohaline currents?Thermohaline currents is also known as 'the ocean conveyor belt' or 'the global conveyor belt'. It is a part of the large scale ocean circulations.
As the name thermohaline suggested that, 'thermo' means heat and 'haline' refers to the salt content. So, when there is a great difference in the temperature and the salt content deep sea currents occur.
Hence option (2) is correct i.e. thermohaline currents occur due to temperature and salinity difference.
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Which statement about the organisms whose fossils are found in the rock is correct?
A.) Organism W existed much before Organism Y.
B.) Organism Y existed over the longest period of time.
C.) Organism Y and Organism U were alive over the same time span.
D.) Organism W existed over a shorter period of time than did Organism X. The table below shows the fossils of organisms found in various layers of an undisturbed rock:
Answer:
a?
Explanation:cause if organism w is a fossil and organism y is a rock the rock is way older than a fossil so a
Answer:
the answer is C
Explanation:
just did the test and Y, and U are in the same layer...so both were alive over the same time span.
Nitrogen gas reacts with hydrogen gas to produce ammonia according to the following equation.
N2(g)+3H2(g) → 2NH3(g)
What is the mole of ammonia produced from 7.23 x 10−4 moles of the hydrogen reactant, assuming there is sufficient nitrogen to react?
7.23 x 10−47.23 x 10−4
8.42 x 10−38.42 x 10−3
4.82 x 10−44.82 x 10−4
4.83 x 10−3
Answer:
4.82 x 10^-4
Explanation:
7.23 x 10^-4 mol H2 l 2 mol NH3
------------------------------------------------------- =
l 3 mol H2
(7.23 x 10^-4) x 2 / 3 =
4.82 x 10^-4
Hope this helped! ;)
The mole of ammonia produced from 7.23 x 10⁻⁴ moles of the hydrogen reactant when there is sufficient nitrogen to react is 4.82×10⁻⁴.
What is moles?Moles is a unit which is used to estimate the amount of any substance and it is represented as:
n = W/M , where
W = given mass
M = molar mass
Given chemical reaction is:
N₂(g) + 3H₂(g) → 2NH₃(g)
In the question it is given that sufficient moles of N₂ is present, so the formation of product depends on the moles of H₂. From the stoichiometry of the reaction, it is clear that:
3 moles of H₂ = produce 2 moles of NH₃
7.23×10⁻⁴ moles of H₂ = produce 2/3 × 7.23×10⁻⁴=4.82×10⁻⁴ moles of NH₃
Hence, option (C) is correct i.e. 4.82×10⁻⁴.
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what is the answer to N2+H2=NH3
Explanation:
This can be fixed by multiplying the product contacting nitrogen by 2. o The new chemical equation is N2 +H2 →2 NH3. Reactants. Products. Nitrogen. 2. 2.
is photosynthesis part of chemical change?If yes can I have photosynthesis in chemical equation as chemical symbols
Answer:
yes it is a chemical change
i have made it in above picture
Nitric monoxide (NO) reacts with oxygen gas to form nitrogen dioxide (NO₂), a dark brown gas. If 5.895 mol of NO is mixed with 2.503 mol of O₂,
determine the limiting reagent.
calculate the number of grams of NO₂ produced.
and determine how many grams of excess reagent remain unreacted.
Answer:
Limiting reactant: O2
grams NO2 produced = 230.276 g NO2
grams of NO unused = 26.67 gNO
Explanation:
2NO + O2 --> 2NO2
Step 1: Determine the molar ratio NO:O2
molar ratio NO:O2 = 5.895: 2.503 = 2.35
stoichiometric molar ratio NO:O2 = 2:1
So, O2 is the limiting reactant.
Step2: Determine the grams of NO2:
?g NO2 = moles O2 x (2moles NO2/1 mol O2) x (MM NO2/ 1 mol NO2) = 2.503 x 2 x 46 = 230.276 g NO2
Step 3: Determine the amount of excess reagent unreacted
moles excess NO reacted = moles O2 x (2 moles NO/1 mol O2) = 2.503 x 2 = 5.006 moles NO reacted
moles NO unreacted = total moles NO - moles NO reacted = 5.895-5.006 =0.889 moles NO unreacted
mass NO unreacted = moles NO unreacted x MM NO = 0.889 x 30 =26.67 g NO unreacted
PLEASE HELP ASAP
During convection heat is transferred through fluids. Which statement is true about fluids?
Only gasses are fluids
Only liquids are fluids
Only solids are fluids
Both liquids and gasses are fluids
Shontal compared some of the properties of a marble to a piece
of wood. She placed a marble and a piece of wood in a bucket filled
with water. Shontal observed the wood floating on top of the water,
but the marble sank to the bottom of the bucket. Which statement
best explains why the marble and piece of wood acted differently in
the water?
Answer:
I can't see your answer choices, but it would be something that related to density of the marble vs. wood.
Explanation:
Density is mass divided by volume. A marble with a greater density than water will sink, and wood with lower density than water will float.
what is the noble gas configuration of V+3
Answer:
Ar 3d3 4s2
Explanation:
I will give any one Brainliest, Thanks, & a 5 rating who can Guess my Top 2 Phobia's.
I will give 1 hint for each though...
1st phobia hint is we creep & crawl everywhere we may be small but some people get scared.
2nd phobia hint is things that life is gone and no longer breathes
Answer:
scared of bugs and dead things, or death itself?
Answer:
scared of bugs and dead things, or death itself?
Explanation:
The process of cell division in which the resulting cells have half the chromosomes number of the parent cell.
Question 1 options:
ossmosis
mitosis
meiosis
diffusion
Answer:
Meiosis
Explanation:
This is The process of cell division in which the resulting cells have half the chromosomes number of the parent cell.
Na2SO4
How many oxygen stems are?
Answer:
Na2SO4 means: two moles sodium (45.98 g), one mole sulfur (32.06 g), and four moles oxygen (64.00 g) combine to form one mole of sodium sulfate (142.04 g).
Explanation:
Answer:
As we can see in the formulae, Na₂SO₄
We can see that 4 is the subscript of O and that means There are 4 atoms of oxygen.
If the atomic number of an element is 8 and the mass number is 16, the number of neutrons in an atom of that element is what? (show work)
Answer:
8.
Explanation:
Atomic number tells us the number of protons in an element. Mass number is the total amount of mass in an atom, and it comes from the sum of the mass of protons and neutrons, which are both considered to have a mass of 1 amu.
If the total mass is 16amu and 8amu comes from the 8 protons, the remaining mass comes from neutrons.
16 - 8 = 8
If a reaction is endothermic,
1 point
More energy is released when the bonds in the products are formed than is used to
break the bonds in the reactants
The temperature increases
The same amount of energy is used to break the bonds of the reactants as is released
when the bonds in the products are formed
О O
It takes more energy to break the bonds of the reactants than is released when the
bonds in the products are formed
Answer: It takes more energy to break the bonds of the reactants than is released when the bonds in the products are formed
Explanation:
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat. Thus it takes more energy to break the bonds of the reactants than is released when the bonds in the products are formed
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat. Thus More energy is released when the bonds in the products are formed than is used to break the bonds in the reactants
2. Combine lead (II) nitrate and potassium iodide solutions.
Pb(NO3)2+ Kl →
2. Combine lead (II) nitrate and potassium iodide solutions.
Pb(NO3)2+ Kl →
3. Combine magnesium metal and hydrochloric acid solution.
Mg + HCl →
4. Electrolysis (splitting) of water.
H2O →
5. Burning magnesium.
Mg + O2 →
Answer:
Pb(NO3)2+ 2Kl →PbI2 + 2KNO3
Mg + 2HCl → MgCl2 + H2
4H2O → 4H^+ + 4OH^-
2Mg + O2 → 2MgO
Explanation:
This question has to do with the balancing of chemical reaction equations. The general rule for balancing chemical reaction equation is that the number of atoms of each element on the left hand side of the reaction equation must be equal to the number of atoms of the same element on the right hand side of the reaction equation.
This principle was followed in balancing each reaction equation above. For instance, in the burning of magnesium, there are two atoms of both magnesium and oxygen on either side of the reaction equation.
someone plz help me.
Answer:
The answer is 2.
Explanation:
It is the only one that has a chemical change.
Hope this helped you :)
If so pls give brainliest.
A 2.00 g sample of ammonia (NH3) reacts with 4.00 g of oxygen (O2) according to the equation 4NH3+5O2→4NO+6H2O. How much excess reactant remains after the reaction has stopped ( knowing that NH3 is the excess reactant )?
Answer:
0.017 moles of ammonia remains after the reaction is stopped.
Explanation:
The reaction is:
4NH₃ + 5O₂ → 4NO + 6H₂O
The first step is to convert the mass to moles, of each reactant:
2 g . 1mol/ 17g = 0.117 moles of NH₃
4 g . 1mol /32g = 0.125 moles of O₂
Ammonia, states the question, is the excess reactant so we can confirm it,
5 moles of oxygen need 4 moles of ammonia to react (by stoichiometry)
Then, 0.125 moles of oxygen may react to (0.125 . 4) / 5 = 0.1 moles
As we have 0.117 moles of ammonia and we need 0.1 moles.
(0.117 - 0.1) = 0.017 moles remains after the reaction is completed.
If we convert the moles to mass we have:
0.017 mol . 17 g /1mol = 0.289 g
Which reactions are oxidation-reduction reactions? Check all that apply.
(1) 2 upper N a plus upper C l subscript 2 right arrow 2 upper N a upper C l.
(2) Upper P b (upper O upper H) subscript 2 right arrow upper P b upper O plus upper H subscript 2 upper O.
(3)Upper C u plus 2 upper A g upper N upper O subscript 3 right arrow upper C u (upper N upper O subscript 3)subscript 2 plus 2 upper A g.
(4)Upper Z n upper B r subscript 2 plus 2 upper A g upper N upper O subscript 3 right arrow 2 upper A g upper B r plus upper Z n (upper N upper O subscript 3) subscript 2.
(5)Upper C upper H subscript 4 plus 2 upper O subscript 2 right arrow upper C upper O subscript 2 plus upper H subscript 2 upper O.
answer- 1,3, & 5
explanation- I did it on edge 2021
Answer:
the 1st 3rd and 5th ones
EDGE 2021
Explanation:
Answer:
A
C
E
Explanation:
What is an example of quantity of the resource being used by humans that affected
Answer:
1. Healthy and well educated people contribute to their societies in positive way
2. Malnourished and illiterate people cannot contribute much to their respective societies.
Explanation:
Which of the following chemical reactions produces water via a
synthesis reaction?
a 2H2 + O2 + 2H2O
b NaOH + HCI - NaCl + H2O
C CuO + H2 - Cu + H2O
d H2CO3 → CO2 + H2O
Answer:
Should be A, but also I think there should be an arrow between O2 and 2H2O
What will a balloon do to a cloth if its negatively charged
Answer:
This involves negatively charged particles (electrons) jumping to positively charged objects. When you rub the balloons against the fabric they become negatively charged. They take some of the electrons from the fabric and leave them positively charged.
Explanation:
Negative charges attract to positive charges. If a balloon is not rubbed with the wool cloth, it has an equal amount of negative to positive charges, so it will attract to a rubbed balloon. When both balloons are rubbed with the wool cloth, the both receive negative charges, so they will repel each other.
1. What two types of cells contain chloroplasts?
Answer:
plant cells and eukroyatic algae
Mars is known as the red planet, and Neptune is known as the icy blue planet. What is a common characteristic between Mars and Neptune?
Answer:
They both have atmospheres. Also, both planets have more than one moon.
To investigate the effect of salt water on a cell, a researcher places one cell sample in freshwater and a second cell sample in salt water. After six hours, the researcher observes and sketches the two cells as shown. What change in the cells occurred during the six hours the cells remained undisturbed? A.Osmosis occurred in the salt water cell sample because the water from inside the cell moved out of the cell to a lower concentration, causing the cell to shrink. B.Osmosis occurred in the freshwater cell sample because the water from outside the cell moved into the cell to a higher concentration, causing the cell to grow. C.Osmosis occurred in the salt water cell sample because the salt from outside the cell moved into the cell to a lower concentration, causing the cell to shrink. D.Osmosis occurred in the freshwater cell sample because the salt from inside the cell moved out of the cell to a higher concentration, causing the cell to grow.
Answer:
MARK ME BRAINLIEST
Explanation:
MARK ME BRAINLIEST
When thermal energy is removed from matter, what happens to the molecules?
Answer:
Figure it out.
Explanation:
How does pressure affect an organism plants?
Answer:
Turgor pressure in plants. Turgor pressure within cells is regulated by osmosis and this also causes the cell wall to expand during growth.
Explanation:
I hope that helps
what is electron cloud?