Answer:
a
Explanation:
it's the most common thought of element when you need a compound from earth
When an object resist movement by a force
Answer: Inertia
Explanation:
Kelly ran electricity though a sample of water using electrolysis. the water changed into two gases,x and y.it was not possible to break down the gasses x and y into simpler particles.which statement is best supported by this evidence.
a.the gas y is a water vapor.
b.water is an element.
c.the gases x and y are compounds.
d.the gases x and y are elements
Answer:
d.the gases x and y are elements
Explanation:
Since it is impossible to further break down the gases produced during this electrolytic process, we can conclude that the gases x and y are elements.
An element is a distinct substance that cannot be split up into simpler substances. Such substances are made up of only one kind of atom.
It is impossible through chemical reactions split an element into simpler units.
PLEASE HELP ASAPP!!!!!!!!!!!!!!!!!!!!!!!! TIMED TEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!A man pushes a box with a force of 75.0 N across a 12.0 m loading dock. How much work did he do on the box? (Use formula W = F x d)
Answer:
Answer:
Work done, W = 900 joules
Explanation:
It is given that,
Force acting on the man, F = 75 N
Distance, d = 12 m
We need to find the work done by the man on the box. Let it is given by W. The work done of an object is equal to the product of force and distance. Mathematically, it can be calculated as :
W = F × d
W=75\ N\times 12\ mW=75 N×12 m
W = 900 joules
So, the work done by the man on the box is 900 joules. Hence, this is the required solution.
hope it is helpful
What affects wind speed?
Answer:
At the Earth's surface, wind blows horizontally from high pressure to low pressure areas. The speed is determined by the rate of air pressure change, or gradient, between the two pressure areas. The greater the pressure difference, the faster the winds.
- sciencing
The Four Forces That Influence Wind Speed & Wind Direction
Explanation:
what are all the ways you can change a piece of binder paper?
Answer:
you can burn it.
Explanation:
that is the way to change paper
What is a binary acid? ______________________________________________________
________________________________________________________________________
2) What is a monatomic ion? ___________________________________________________
3) What is a polyatomic ion? ___________________________________________________
4) Where are the halogens located on the periodic table?
Answer:Binary acids are acids composed of two atoms ,a hydrogen element and non metal element .Binary acids are also known as Hydracids.
Explanation:For example
Hydrochloric acid (HCl), hydrofluoric acid (HF), and hydroiodic acid (HI) are all binary acids.
what is the volume of 5 moles of oxygen gas at rtp
Answer:
5 moles of oxygen occupy 120 dm³ volume.
Explanation:
Given data:
Number of moles = 5 mol
Volume of gas = ?
Solution:
In question it is given gas is at room temperature and pressure.
One mole of any gas at room room temperature and pressure occupy volume of 24 dm³. Thus,
5 mole of gas occupy volume of,
5 mol × 24 dm³/1 mol
120 dm³
5 moles of oxygen occupy 120 dm³ volume.
Describe the levels of organization of a complex, multicellur organism such as a mouse starting with the cell
The level of organization of a complex, multicellular organism such as a mouse, starting with the cell, is. The cellular level, the tissue level, the organ level, the organ system, and lastly the organism.
What is level or organization?The level of organization of the body is the organization of the body with the smallest unit like the cell. As we know, the smallest unit of life is the cell. So the organization of energy in living organisms starts with a cell.
The cellular level is the cells, the cell combine to form tissue and many tissues join together to form an organ. Many organs join together to create an organ system, and the organ system establishes an organism.
Thus, starting with the cell, the organization of a complex, multicellular creature like a mouse is. cell level, tissue level, organ level, the organ system, and finally organism level.
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A neutral atom of gold has the same number of electrons and what?
ik its confusing so you can just go to the pdf
1. Which letters show the balls with the maximum potential energy? A D E G 2. Which letter shows the ball with the maximum kinetic energy? B C D G 3. Which letters show the balls with the least kinetic energy? A B F G 4. Which letter shows the ball with the least potential energy? C D E G 5. Which letters show the balls with a little less kinetic energy than ball C? A B D F 6. Which letters show the balls with a little more potential energy than ball D? C D E F 7. Which letters show the balls with a little more potential energy than ball F? A C E G 8. Which letters show the balls with a little less potential energy than ball G? A B F G 9. Which letter shows the ball with a little more kinetic energy than ball C? B C D F 10. Which letter shows the ball with a little less potential energy than ball E? B D E F 11. What TWO things decide the amount of kinetic energy an object can have? ______________________________________________ 12. Name two other things that can show kinetic and potential energy in action.
1 A
2 C
3 G
4 D
5 E
6 A and G
7 D and E
8 F
9 B
10 C
11 if it is in motion and how much motion it has
12 a bow being pulled back shows potential and dropping a ball can chow kinetic
IM SO SRRY don't feel bad
Answer:
I’m sad
Explanation:
What element has the following electron configuration? 1s 22s 22p 63s 23p 64s 2
Answer:
answer is D
Explanation:
A laboratory bottle of helium gas occupies a volume of 2.0 L at 760 mm Hg. Calculate the new pressure if the volume falls to 1.8 L.
Answer: 844 mm Hg
Explanation:
A list of scenarios is shown below.
I. Water is running
II. A car is parked on a hill
III. One liter of gasoline sits on a bench
Which of the scenarios has kinetic energy?
A
1, only
В.
II, only
с
II and III, only
D
I and III, only
Please help
Answer:
A
Explanation:
A: because for something to have kinetic energy it has to be in motion, the other 2 scenarios are not moving.
Which one will diffuse faster Ammonia or carbon dioxide Why?
jcp-fnoa-kzk join here
A student used the Dumas method to determine the molar mass of a volatile material. They placed the container into the ice bath BEFORE all of the material was vaporized. What will happen to their final calculations?
A. The Molar Mass will be too low.
B. The Molar Mass will not be effected.
C. The Molar Mass will be too high.
Answer: the molar mass will be too high
Explanation:
Strontium-90 is one of the products of the fission of uranium-235. This strontium isotope is radioactive, with a half-life of 28.1 yr. Calculate how long it will take for 0.900 g of the isotope to be reduced to 0.170 g by decay.
Answer:
67.6 years is the time the isotope take to decay from 0.900g to 0.170g
Explanation:
The radioactive decay follows first order law:
Ln [A] = -kt + ln[A]₀
Where [A] is concentration after time t,
k is decay constant:
k = ln 2 / t(1/2)
k = ln2 / 28.1 years
k = 0.02467 years⁻¹
[A]₀ = Initial concentration.
We can replace concentration and use the mass of the isotope:
Ln [A] = -kt + ln[A]₀
Ln [0.170g] = -0.02467 years⁻¹t + ln[0.900g]
-1.667 = -0.02467 years⁻¹t
t =
67.6 years is the time the isotope take to decay from 0.900g to 0.170gThe time required for the sample to reduce to 0.170 grams has been 67.75 years.
Half-life can be defined as the times required by the substance to reduce to half of its initial concentration.
The half-life can be expressed as:
Amount left = Initial amount [tex]\times[/tex] [tex]\rm \dfrac{1}{2}^\dfrac{time}{Half-life}[/tex]
From the given:
0.17 g = 0.9 [tex]\rm \times\;\dfrac{1}{2}^\dfrac{t}{28.1}[/tex]
[tex]\rm \dfrac{0.17}{0.9}[/tex] = [tex]\rm \dfrac{1}{2}^\dfrac{t}{28.1}[/tex]
0.188 = [tex]\rm (0.5)^\dfrac{t}{28.1}[/tex]
Taking log on both the sides,
log 0.188 = [tex]\rm \dfrac{t}{28.1}\;\times[/tex] log 0.5
2.411 = [tex]\rm\dfrac{t}{28.1}[/tex]
t = 2.411 [tex]\times[/tex] 28.1 years
Time = 67.75 years.
The time required for the sample to reduce to 0.170 grams has been 67.75 years.
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What is the definition of a community in environmental science
Pls help 7th grade science
Answer:
It would be the first one, an overall positive charge on one end and overall negative charge on the other end.
Explanation:
Answer:
It's A.) A molecule that has an overall positive change in one end and an overall negative charge on the other
Explanation:
The definition of a polar molecule is a molecule with a negatively charged end and a positively charged end.
Help meee, if u help me i give u a pizza :)
The density of ice at its freezing point is 0.917 g/cm3. What is the mass of 2.5 cm3 of ice at this temperature?
A. 1.6 g
B. 2.3 g
C.2.7 g
D.3.4 g
Answer:
The answer is option BExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 0.917 × 2.5 = 2.2925
We have the final answer as
2.3 gHope this helps you
Answer:. 2.3 g
Explanation:
Where is type of precipitation is most likely to form during a thunderstorm
Answer:
hail, btw have a nice day
Answer:
Hail
Explanation:
I got it right on my test
2Ni(OH) → Ni2O + H2O
How many moles of water forms from 4.20 mol of nickel (I) hydroxide?
Answer:
2.1 moles of water formed.
Explanation:
Given data:
Moles of water formed = ?
Moles of Ni(OH) = 4.20 mol
Solution:
Chemical equation:
2Ni(OH) → Ni₂O + H₂O
Now we will compare the moles of Ni(OH) with water.
Ni(OH) : H₂O
2 : 1
4.20 : 1/2×4.20 = 2.1 mol
2.1 moles of water formed.
When mixing an acid with water, which of the following must always be done?
A.
Never mix an acid with water, it will explode.
B.
Always add the acid to the water slowly, taking a moment to stir between drops.
C.
Always heat the acid before mixing with water.
D.
Always shake both solutions before mixing.
Answer:
B
Explanation:
Answer:
B. Always add the acid to the water slowly, taking a moment to stir between drops
help please this is due soon!!
Answer:
33
Explanation:
The Texas high plains region does not revive much rain. It is reasonable to predict that this region, compared to other ecoregions, would have
Answer:
Less soil erosion
Explanation:
Due to the low amount of rainfall in this region, it is easier to say that the region compared to other ecoregion will suffer less soil erosion.
Erosion is usually the washing away of the top layer of the soil. Rainfall is one of the most important element that causes erosion. Surface runoff for an extended period of time can remove the topmost layer of the earth on which plant can grow. This starves the soil of its rich nutrients and minerals.
how many grams of molecular oxygen (O2) is produced from 13.8 grams of calcium chlorate (Ca(ClO3)2)in the following chemical reaction?Ca(ClO3)2→CaCl2+ 3O2
Answer:
6.72 g
Explanation:
Given data:
Mass of calcium chlorate = 13.8 g
Mass of oxygen produced = ?
Solution:
Chemical equation:
Ca(ClO₃)₂ → CaCl₂ + 3O₂
Number of moles of calcium chlorate:
Number of moles = mass / molar mass
Number of moles = 13.8 g/ 206.98 g/mol
Number of moles = 0.07 mol
Now we will compare the moles of oxygen and calcium chlorate.
Ca(ClO₃)₂ : O₂
1 : 3
0.07 : 3×0.07=0.21 mol
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 0.21 mol × 32 g/mol
Mass = 6.72 g
please help with these questions, it is due soon
Someone Help Me Pls
Describe the relationship between Chemistry and PCR test
Answer:
In Chemistry, proteins are defined as biomolecules that are essential for the human body to maintain homeostasis. In a PCR test, short for Polymerase Chain Reaction test, scientists are tracking for a certain chemical substance in our body that may be present in the process of protein synthesis or DNA replication that could possibly show if a person is positive for the Corona Virus.Therefor, the relation between Chemistry and the PCR test is that, without Chemistry, the PCR test would not be able to stand on its own, which in other words means the PCR test is dependent upon the presence of Chemistry.
please I need help with everything
Answer:
See below!
Explanation:
An acid (A) will have acid in the name. It will also have a hydrogen bonded to an electronegative compound. A molecular compound (M) will have nonmetals and/or hydrogen. An ionic compound (I) will have nonmetals and first and second column metals. It could also include charged compounds. A transition metal (TM) will have a transition metal in the compound.
The formulas for TM and I are made by balancing the charges of the atoms to equal zero. The formulas for M can be found from the name itself. The formulas for A have to be memorized.
TM ==> copper (II) oxide ==> CuO
A ==> hydrosulfuric acid ==> H₂S
TM ==> iron (III) fluoride ==> FeF₃
TM ==> lead (II) chlorate ==> PbCl₂
A ==> hydrochloric acid ==> HCl
M ==> dihydrogen monoxide ==> H₂O
A ==> sulfurous acid ==> H₂SO₃
I ==> potassium oxide ==> KO
I ==> ammonium hydroxide ==> NH₄OH
M ==> nitrogen trioxide ==> NO₃
I ==> aluminum phosphate ==> AlPO₄
To name ionic (I) compounds, simply put the name of the metal with the nonmetal. But, for the nonmetal change, the ending to "-ide". To name acids (A), say hydro- with the atom/compound it is attached to and end with acid.
I ==> MgSO₄ ==> magnesium sulfate
I ==> HgS ==> mercury sulfide
I ==> Na₂S ==> sodium sulfide
A ==> HF ==> hydrofluoric acid
I ==> KCN ==> potassium cyanide
Compared to H2S, the higher boiling point of H2O is due to the
1.
greater molecular size of water
2.
stronger hydrogen bonding in water
3.
higher molarity of water
4.
larger gram-formula mass of water
Answer:
2, stronger hydrogen bonding
Explanation:
[tex]\rm H_2O[/tex] has higher boiling point than [tex]\rm H_2S[/tex], as there has been stronger hydrogen bonding in [tex]\rm H_2O[/tex]. Thus, option 2 is correct.
The boiling point has been the temperature at which the liquid has been converted to the gaseous form. The boiling point has been based on the intemolecular attractions between the atoms.
Higher boiling pointBased on the intermolecular interactions, the compound with higher intermolecular force required more energy to break the bond and change the state, and thus have high boiling point.
The hydrogen sulfide and water has hydrogen bonding. The hydrogen bonding has been based on the electronegativity of the atom involved. The more electronegative atom, stronger will be hydrogen bonding and thereby higher boiling point.
In [tex]\rm H_2S[/tex] and [tex]\rm H_2O[/tex], the oxygen has been more electronegative than sulfur and thus results in stronger hydrogen bonding.
Thus, [tex]\rm H_2O[/tex] has higher boiling point than [tex]\rm H_2S[/tex], as there has been stronger hydrogen bonding in [tex]\rm H_2O[/tex]. Thus, option 2 is correct.
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