at the left.
6.
1. Work equals
A force x distance
B. force - distance
C. force + distance.
The force you apply to a machine
is the
A. input force.
B. output force.
C. efficiency.
2.
The unit of work is the
A. watt.
B. newton.
C. joule.
7.
The efficiency of all real
machines is
A. greater than 100%
B. equal to 100%
C. less than 100%
3.
Power is the amount of
A. work done per unit of time.
B. force on a certain area.
C. pressure in a volume of liquid.
8.
4.
The unit for power is the
A. joule.
B. Meter per second
C. watt.
The fixed point that a lever rotates
around is called the
A. fulcrum.
B. input force.
C. wedge.
9.
5.
A machine cannot change the
A. direction of the input force.
B. amount of work needed to do
A screwdriver is an example of a
simple machine called a
A. pulley.
B. screw
C. wheel and axle.
a task.
C. distance over which a force
is applied
10.
Your front teeth are
A. wedges.
B. levers.
C. compound machines.
Answers
Answer:
i know right answer
Explanation:
let me explain
Related Questions
What is an example for "chemical equations"?
Answers
Answer:
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side.
Explanation:
Need help with this can some please help
Answers
8 grams of hydrogen and 32 grams of oxygen will combine to form how many grams of water?
Answers
Answer:
9 grams of water
Explanation:
What is different about the transition metals and
their charges from other groups on the periodic
table?
A: Their charge is positive but not always the same each
time
B: Their charge is negative but not always the same each
time
C: they are usually neutral
Answers
Answer:
i think a im not 100 %sure
Explanation:
Most transition metals differ from the metals of Groups 1, 2, and 13 in that they are capable of forming more than one cation with different ionic charges. It can sometimes lose two electrons to form the Fe2+ ion, while at other times it loses three electrons to form the Fe3+ i hope it helped
Carbonate is a polyatomic ion whose oxidation number is -2. How many carbonate ions would be required to bond with aluminum in a neutral ionic compound?
Answers
Answer: Three carbonate ions are required to bond with aluminum in a neutral ionic compound.
Explanation:
An ionic compound is defined as the compound that is formed by the complete transfer of electrons takes place from one atom (forming cation) to another atom (forming anion).
A neutral ionic compound does not carry any charge on it.
As we know, aluminum is a trivalent atom having valency 3 and forms [tex]Al^{3+}[/tex] ion and carbonate is a divalent polyatomic ion having formula [tex]CO_3^{2-}[/tex].
They both combine to form a neutral ionic compound named aluminum carbonate.
By criss cross method, the chemical formula of aluminum carbonate is [tex]Al_2(CO_3)_3[/tex]
Hence, three carbonate ions are required to bond with aluminum in a neutral ionic compound.
Some consumers, like lions, do not eat plants or any other producers. They only eat other animals.
How do lions obtain the carbon they need?
by eating animals that have carbon-based molecules stored in their bodies
by breathing it in from the atmosphere in the form of carbon dioxide
by absorbing carbon-based molecules through their skin from the soil
by drinking water that contains carbon dioxide
Answers
Answer:
a
Explanation:
Some consumers, like lions, do not eat plants or any other producers. They only eat other animals. lions obtain the carbon they need by eating animals that have carbon-based molecules stored in their bodies and the correct option is option 1.
What are Consumers?Heterotrophs are known as consumers because they consume producers or other consumers. Heterotrophs occupy the second and third levels in a food chain, a sequence of organisms that provide energy and nutrients for other organisms.
Heterotrophic living organisms include all animals and fungi, some protists and bacteria, many types of parasitic plants.
Carnivores (organisms that eat meat) and omnivores (organisms that eat plants and meat) occupy the third level.
Therefore, Some consumers, like lions, do not eat plants or any other producers. They only eat other animals. lions obtain the carbon they need by eating animals that have carbon-based molecules stored in their bodies and the correct option is option 1.
Learn more about Consumers, here:
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Liquid or solid water that falls to the ground is called
Answers
What is the molar mass of B,(Croa)g?
a. 186 g/mol
b. 369 g/mol
C. 232 g/mol
d. 250 g/mol
Answers
In a lever,E×E.D.=L×__________
Answers
Answer:
LD is a answer okkkkkkkkkkkkkkkkk
Consider a 0.10 M solution of a weak polyprotic acid (H2A) with the possible values of Ka1 and Ka2 given below. Calculate the contributions to [H3O+] from each ionization step. Ka1=1.0×10−4;Ka2=5.0×10−5
Answers
Answer:
The first dissociation occurred at 0.00311 M and the second at 0.0000484 M.
Explanation:
From the given information:
The ICE table can be computed as follows:
H2A → HA⁻ + H⁺
Initial 0.10 0 0
Change -x x x
Equilibrium 0.10 - x x x
[tex]Ka_1 = \dfrac{[HA^-][H^+]}{[H_2A]}[/tex]
[tex]1.0\times 10^{-4}= \dfrac{[x][x]}{[0.10-x]}[/tex]
[tex]1.0\times 10^{-4}= \dfrac{(x)^2}{(0.10-x)}[/tex]
By solving for x;
x² = (1.0 × 10⁻⁴ × 0.1)
x = [tex]\sqrt{1\times 10^{-5}}[/tex]
x = [H⁺] =[HA⁻] = 0.00311 M
The acid then further its dissociation again, So;
The ICE table can be computed as follows:
HA⁻ → A⁻ + H⁺
Initial 0.00311 0 0.00311
Change -x x x
Equilibrium 0.00311 - x x 0.00311 + x
[tex]Ka_2 = \dfrac{[A^-][H^+]}{[HA]}[/tex]
[tex]5.0 \times 10^{-5} = \dfrac{(0.00311+x)x}{(0.00311-x)}[/tex]
By solving for x;
x = [H⁺] = 0.0000484 M
Therefore, the first dissociation occurred at 0.00311 M and the second at 0.0000484 M.
PHYSICAL SCIENCE PLEASE PLEASE HEP DUE TODAY AT 11!! will give brainly if its correct!! <3333 thank you so muchh!!
Which problem cannot be solved using the scientific method?
determining which student reads faster
discovering who invented the radio
discovering how much salt should be used to boil water faster
determining which laundry detergent works best
Answers
Answer:
I would say discovering who invented the radio.
Explanation:
The other ones can be solved by experiments and the "discovering who invented the radio" cannot be solved by an experiment.
hope this helps.
Answer:
I would say who invented the ratio
Explanation:
Well you dont need to use the scientific method to know WHO discovered it, you use it to determine HOW
Will sodium displace iron from iron oxide?
Answers
Answer:
Explanation: A more reactive metal will displace a less reactive metal from a compound. The thermite reaction is a good example of this. It is used to produce white hot molten (liquid) iron in remote locations for welding. A lot of heat is needed to start the reaction, but then it releases an incredible amount of heat, enough to melt the iron.
aluminium + iron(III) oxide → iron + aluminium oxide
2Al + Fe2O3 → 2Fe + Al2O3
Because aluminium is more reactive than iron, it displaces iron from iron(III) oxide. The aluminium removes oxygen from the iron(III) oxide:
Answer:
Displacement reactions involve a metal and a compound of a different metal. In a displacement reaction:
Explanation:
a more reactive metal will displace a less reactive metal from its compounds
Displacement reactions are easily seen when a salt of the less reactive metal is in the solution. During the reaction:
the more reactive metal gradually disappears as it forms a solution
the less reactive metal coats the surface of the more reactive metal
For example, magnesium is more reactive than copper. When a piece of magnesium is dipped into blue copper sulfate solution:
the blue colour fades as colourless magnesium sulfate solution forms
brown copper coats the surface of the magnesium
I hope this is correct or answers your question :)
Calculate the atoms of hydrogen in 52.0 g of H2O.
Answers
Answer:
34.81 ×10²³ atoms
Explanation:
Given data:
Mass of water = 52.0 g
Number of atoms of hydrogen = ?
Solution:
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 52.0 g/ 18 g/mol
Number of moles = 2.89 mol
1 mole of water contain 2 mole of hydrogen.
2.89 mole of water contain 2.89× 2= 5.78 moles of hydrogen.
Number of atoms of hydrogen:
1 mole = 6.022×10²³ atoms
5.78 mol × 6.022×10²³ atoms / 1mol
34.81 ×10²³ atoms
5. Which is incorrect about pure substances and mixture?
A. Colloids and suspensions from two or more phases.
B. Mixtures can be composed of different elements and compound.
C. The components of compound can be separated through distillation.
D. The sample of a compound from different sources have the same composition and proportion of elements.
Answers
Answer:
B
Explanation:
mixture is two or more substances chemically combined that retain their physical and chemical properties
Atoms and elements are examples of A. molecules. B. mixtures. C. compounds. D. pure substances.
Answers
Answer:
atom are very tiny partical
For the compound butane (C4H10)
a) What are the elements in the compound?
b) What are the number of atoms of each element?
c) What are the total number of atoms per molecule?
Answers
B. Carbon: 6 Hydrogen: 1
C. 34
Explain why the following structure is incorrect
Answers
Answer:
there is too many electrons around the shell
Explanation:
Oxygen has to bond to two other atoms so the C-O bond should be a double bond to fulfil both of their bonding rules.
Hydrogen can only bond to one other atom, therefore it cannot make a double bond so that bond must be a single bond. (Carbon there is also bonding to five atoms so changing it to a single bond will fulfil both of their bonding rules).
I’ll mark you brainlist plz
Answers
Answer:
I think nuetron stars
Explanation:
using the model, what is the mass of the atom pictured?
A) 3amu
B) 5amu
C) 7amu
D) 9amu
Answers
Answer:
A) 3amu
Explanation:
4C + Sg → 4CS
is this balanced or unbalanced?
Answers
true or false, a materials melting point and freezing point are the same.
Answers
I hope I’m correct
Answer:
I think that is true but I could be wrong
Explanation:
Please Help ASAP 100 points! Students set up a controlled experiment. They put five crickets in each of three identical containers. They set one container to 15C, one to 20C and one to 25C. Then they count the number of cricket chirps in each container during 1 hour. What are the TWO constants in this experiment? A: The number of crickets in each container. B:The temperature of each container. C: The number of cricket chirps. D: The kind of containers used.
Answers
Answer:
A and C.
Explanation:
Consider the following reaction: 3Fe(s) + 4H₂O(g) ➞ Fe₃O₄(s) + 4H₂(g). To answer the following question: "How many moles of hot water vapor (steam) must react to produce 275 g of Fe₃O₄?" How many steps will it take to get the answer? *
4 points
1
2
3
4
Answers
Solve the equation
x = 4.71 mol of hot water vapor (steam)
Can you mark me as brainliest?
how much heat is absorbed when 15.0 g of liquid water is heated until the temperature increases by 16.0.
Answers
How many liters will 90.0 grams of xenon gas (Xe) occupy at STP?
HELP PLEASE
Answers
Answer:
22.4L
Explanation:
not sure if its totally correct but I tried
Below is the balanced equation for the production of methane. Use it to explain how the law of conservation of matter is upheld in the decomposition of organic trash. 4C2H5O2N + 2H2O → 3CH4 + 5CO2 + 4NH3 Glycine + Water yields Methane + Carbon dioxide + Ammonia
Answers
Answer:
See explanation
Explanation:
A balanced equation demonstrates the conservation of mass because the same number of of atoms of each element is found on both sides of the reaction equation.
This goes a long way to establish that mass or matter can neither be created nor destroyed but may be transformed from one form to another.
Looking at this balanced reaction equation;
4C2H5O2N + 2H2O → 3CH4 + 5CO2 + 4NH3
There are eight carbon atoms on both sides of the reaction equation
There are 24 hydrogen atoms on both sides of the reaction equation
There are 10 oxygen atoms on both sides of the reaction equation
There are four nitrogen atoms on both sides of the reaction equation
Hence, the law of conservation of matter is upheld in the decomposition of organic trash.
The balanced equation for the production of methane:
[tex]4C_2H_5O_2N + 2H_2O ----> 3CH_4 + 5CO_2 + 4NH_3[/tex]
Balanced chemical equation:A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. According to the law of conservation of mass, when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants.
From given balanced equation for the production of methane:
[tex]4C_2H_5O_2N + 2H_2O ----> 3CH_4 + 5CO_2 + 4NH_3[/tex]
There are 8 carbon atoms, 24 hydrogen atoms, 10 oxygen atoms and 4 nitrogen atoms on both sides of the reaction equation, i.e. equal number of atoms on both reactants and products side.
Hence, the law of conservation of matter is upheld in the decomposition of organic trash.
Find more information about Balanced chemical reaction here:
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Señalar la opción correcta El primer alcalino y el primer gas noble tienen la misma cantidad de niveles ocupados El primer alcalinotérreo tiene 2 e en su CEE El cuarto halógeno tiene 5 electrones de valencia
Answers
Answer:
El primer gas alcalino y el primer gas noble tienen el mismo número de niveles ocupados. Cierto.
La primera tierra alcalina tiene 2 e en su CEE. Cierto.
El cuarto halógeno tiene 5 electrones de valencia. Falso.
Explicación:
El primer alcalino y el primer gas noble tienen el mismo número de niveles ocupados porque el primer alcalino tiene 1 electrón y solo tiene una capa, mientras que el gas noble tiene 2 electrones y también tiene una capa. El primer alcalinotérreo tiene 2 e en su CEE debido a la presencia en el segundo grupo en la tabla periódica. El cuarto halógeno no tiene 5 electrones de valencia en su capa más externa, tiene 7 electrones en su capa más externa debido a la presencia en el grupo de siete de la tabla periódica.
Please help! Will mark brainliest!
Answers
Answer:
A
Explanation:
Which group of elements gain electrons?
Answers
Answer:
Non-metals tend to gain electrons
Explanation:
Question 20 (1 point)
The chemical formula for glucose, a simple sugar, is CH1206. The formula for ethanol is CzH60. What
accounts for the differences in these compounds?
Answers
Answer:
A. The ratio of the element in glucose is different than in ethanol
Explanation:
The compounds given are;
Glucose C₆H₁₂O₆
Ethanol C₂H₆O
The two compounds given are different from one another. But they have the same elemental composition.
Ethanol is made up of Carbon, hydrogen and Oxygen and so also, Glucose
Now,
The number of atoms in both compounds are different;
Number of atoms
C H O
Glucose 6 12 6
Ethanol 2 6 1