Answer:
x=7
Explanation:
3x-3=18
-3 moves over the 18 side and becomes +3.
18 + 3 =21
3x=21
now you need to divide 3 with 21 giving you 7
Answer:
The answer is seven bc X is seven.
8
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Which of the following statements is FALSE about the diagrams above?
Diagram B is a mixture of compounds.
Diagram C is a pure substance of a diatomic element.
Diagram D is a mixture of elements and compounds.
Diagrams A&C represent a pure substance of elements.
14 15
Answer:
Diagram B is a mixture of compounds
Explanation:
The false statement about any of the diagram is that diagram B is a mixture of compounds.
Diagram is not a mixture of compounds. It is a single compound in gaseous state .
A compound is a combination of elements in a definite grouping. The properties of the compound is distinct from that of the element that combines to form it. Therefore, since we just a black and yellow circle, the diagram is a compound and nothing more. The other descriptions are perfect.What is the molar mass of a substance?
A. The mass in grams of one mole of a substance
Or
B. The number of particles in one gram of a substance
What is the charge that oxygen gets when it becomes an ion?
Answer:
Explanation: Every electron has a single negative(-) charge, the addition of two electrons results in an oxygen ion with a charge of negative(−)2. This is in fact true of every element located under oxygen in the periodic table.
P.S. hope this helps :)
Can someone answer this pleasee it’s free 15 points
I don’t know
but thank u for the points
I need points hehe
Did you know?
Hawaii is the Widest State in America!!!!!!!
How are two atoms of the same element alike?
Is it because they'll have the same make-up and both have the same amount of protons and neutrons??
Answer:
Explanation:
The nucleus of an atom contains neutrons and protons bonded tightly together. The same chemical element can have a different number of neutrons and still be the same element.
At higher temperatures
A
gas contracts.
B.
gas particles bump into walls less often.
С
particles in an object move faster.
D
particles in an object have less energy
Answer:
i belive its c i could be wrong but theres my input
In an experiment, chemists heated a solid, red substance in a test tube. Vapors from the heated red substance condensed as a metallic liquid on the side of the tube. The red substance eventually disappeared, leaving only the metallic liquid and producing a gas that escaped from the tube. Which statement best describes what happened to the red substance in this experiment?
A.
The experiment demonstrates the formation of plasma from the red substance.
B.
The experiment demonstrates a physical property of the red substance.
C.
The experiment shows that the red substance experienced a chemical change.
D.
The experiment shows that the red substance can be a solid, liquid, or gas.
E.
The experiment shows that the red substance is an element.
Answer:
c
Explanation:
Answer:
C. The experiment shows that the red substance experienced a chemical change.
Which scenario would result in a population growth of zero?
Use this formula:
population growth = (birth rate + immigration) – (death rate + emigration)
A. 12 individuals emigrate, 12 individuals die, 12 individuals are born, 0 individuals immigrate
B. 16 individuals emigrate, 3 individuals die, 13 individuals are born, 0 individuals immigrate
C. 8 individuals emigrate, 0 individuals die, 20 individuals immigrate,12 individuals are born
D. 10 individuals emigrate, 4 individuals die, 14 individuals immigrate, 0 individuals are born
Answer:
D. 10 individuals emigrate, 4 individuals die, 14 individuals immigrate, 0 individuals are born
Explanation:
hi!
What will cause an object to move?
What is magnetic force ? How is the this force
4 Sી ભIndSCO
Answer:
Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. ... The magnetic force between two moving charges may be described as the effect exerted upon either charge by a magnetic field created by the other.
Explanation:
brainlest pls
[tex] \huge \boxed{\mathbb{QUESTION} \downarrow}[/tex]
What's magnetic force ?[tex] \huge \boxed{\mathfrak{Answer} \downarrow}[/tex]
Magnetic force is referred to as the force/phenomenon which is exerted by a magnet when they attract or repel each other through the poles. It's produced by an electric charge.There are 2 poles ⇨ i) North Pole & ii) South Pole.The like pole repel each other while the different poles attract each other. Magnetism is also known as magnetism or magnetic attraction.What is the number of valance electrons for oxygen
Answer:
six
Explanation:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.
Answer:
Six!
Explanation:
Valence electrons are the electrons in the outermost shell of an atom.
PLEASE HELP ASAP!
The sample of gas is in a container with a fixed volume. A student notices that as the temperature increases so does the
pressure. This is a(n) ___
relationship.
There aren’t any answer choices.
Answer:
Direct
Explanation:
Edge
When the temperature increases with an increase in pressure, it is a direct relationship.
What is Gay Lussac's law?Gay-Lussac's law can be described as when the volume of the gas remains constant then the pressure of a gas is directly proportional to the absolute temperature of the gas.
The mathematical equation of Gay Lussca's law is written as follows:
P/T = k
It can be represented as the pressure is directly proportional to the absolute temperature.
P ∝ T (where 'V' volume of gas is constant)
or
[tex]\frac{P_1}{T_1} =\frac{P_2}{T_2}[/tex]
Where P₁ and T₁ are the initial temperature and pressure while P₂ and T₂ are the final pressure and temperature of the gas.
The sample of gas has a fixed volume of gas and on increasing the temperature the gas molecules acquire more and more kinetic energy. So the pressure of the gas will also increase.
Therefore, there will be a direct relationship between temperature and pressure of gas.
Learn more about Gay Lussac's law, here:
brainly.com/question/11387781
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8. At higher temperatures _______.
A. particles in an object have less energy
B. particles in an object move faster
C. a gas contracts
D. particles vibrate slowly
Answer:
B. particles in an object move faster
Explanation:
At higher temperatures, particles in an object moves faster.
Temperature is the degree of hotness or coldness of a body.
At higher temperature, the substance is very hot. Temperature is related to the heat energy content of a bodyAs the temperature increases, the average kinetic energy of the particles of system increases more and more. This is in compliance with the kinetic molecular theory of matter. Therefore, at higher temperatures, particles in an object move faster.Relate the effect of temperature and pressure on a gas to the model of a gas given by the kinetic molecular theory.
the boiling points of two liquids are 120°C and 240°C, to what minimum temperature do I have to heat them in order to separate them?
Answer:
120C°
Explanation:
Can someone help me please!
.
A light wave bends to pass through a crack underneath a door. What type of interaction is this?
Answer:
C
Explanation:
Interference trust me I just did this
A light wave bends to pass through a crack underneath a door, this represents interference. The correct option is option C.
What is light wave?Like other waves, light waves also transfer energy to a source. They are made up of tiny energy particles known as photons. While photons have no mass, they do have momentum and energy.
There are types of light waves which human eyes cannot perceive, just as there are noises that can't be recognized because they fall outside the range of human hearing. However, all forms of waves share characteristics like wavelength and frequency. Wavelength is the separation between neighboring wave components (e.g., crest to crest or trough to trough). A light wave bends to pass through a crack underneath a door, this represents interference.
Therefore, the correct option is option C.
To learn more about light wave, here:
https://brainly.com/question/29128559
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PLS HELP ASAP I WILL GIVE THANKS BUT JUST PLS HELP NOW!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Earth
What is the orbit of the Earth?
Is the Sun at the center of the Earth’s orbit?
Describe the motion of the Earth throughout its orbit? Does it move at a constant speed?
Answer:
The orbit of the earth is a ellipse. Yes. Yes
Explanation:
The recessive trait disappears in a genetic cross.
True
or
False
Answer:
True
Explanation:
What is the balanced equation for KOH+CO2—>K2CO3+H2O
The balanced equation :
2KOH+CO₂⇒K₂CO₃+H₂O
Further explanationEqualization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.
2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product
3. Select the coefficient of the substance with the most complex chemical formula equal to 1
Reaction
KOH+CO₂⇒K₂CO₃+H₂O
give coeffiecientaKOH+bCO₂⇒K₂CO₃+cH₂O
make equationK, left=a, right=2⇒a=2
H, left=a, right=2c⇒a=2c⇒2=2c⇒c=1
O, left=a+2b, right=3+c⇒a+2b=3+c⇒2+2b=3+1⇒2b=2⇒b=1
the equation becomes :
2KOH+CO₂⇒K₂CO₃+H₂O
2. How many moles are in 34.0g of Silver hydroxide?
Answer:
0.272 mol AgOH
Explanation:
Figure out the amount of AgOH in mass, and to find the amount of moles–you just divide the given amount (34g) by the molar mass of AgOH (125g) to figure out the amount of moles. 34/125 = 0.272 mol AgOH.
How many moles are there in 8.50 X 1024 molecules of sodium sulfate, Na2SO3?
Answer:
14.12 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{8.50 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 14.119601...[/tex]
We have the final answer as
14.12 molesHope this helps you
What effect does reusing or recycling municipal waste have on environmental resources? Group of answer choices increased use of fossil fuels preservation of raw materials introduction of pollutants into water systems increased deforestation of local areas
Answer:
preservation of raw materials
Explanation:
Reusing and recycling is the process by which the used products are used again or recycled in different form to use it again. Excessive use of the raw materials can lead to their extinction. Recycling the materials helps in decreasing the pollution in the environment. It also helps in reduction in the emission of the harmful gases. When municipal wastes are reused or recycled, the raw materials are preserved. These are the process involved in sustainable use of resources.
________ is defined as average kinetic energy.
A. temperature
B. volume
C. heat
D. pressure
what is the difference between air pressure and gas pressure?
EASY WORDS PLEASE
Answer:
Air pressure is what you measure with a tire gauge. Atmospheric pressure is what you measure with a mercury barometer. ... Pressure is the amount of force per unit area that a gas exerts on a surface
Explanation:
none
someone help with this pls
Answer:
12 B
13
0.00100176
Explanation:
Sugar is made of carbon, hydrogen, and oxygen atoms. Sugar is A a compound because its parts cannot be separated through physical means. B an element because it is a pure substance whose parts cannot be separated. C a mixture because it is made of different kinds of atoms. D a solution because it dissolves when mixed with water.
Answer:
A a compound because its parts cannot be separated through physical means.
Explanation:
The sugar is a compound because its parts cannot be separated through physical means.
A compound is a substance composed of two or more kinds of atoms joined together in a definite grouping.
The properties of a compound are distinct from those of the elements that makes them up.
A compound and an element are both classified as pure substances due to the homogeneity in their composition.The maximum allowable concentration of Pb2+ ions in water in a local community is 1.51 x 10-8 M. Could a chemist use 2.00 mL of 0.12 M KBr solution on a 5.00 mL sample of tap water to prove through a precipitation reaction that the water supply is safe? Show all work and reasoning
Answer:
The water supply is not safe.
Explanation:
Ionically, the reaction is;
Pb^2+(aq) + 2Br^-(aq) -------> PbBr2(s)
Amount of Br^- reacted = 2/1000 * 0.12 = 2.4 * 10^-4 moles
From the reaction equation;
1 mole of Pb^2+ requires 2 moles of Br^- for complete precipitation
x moles of Pb^2+ requires 2.4 * 10^-4 moles of Br^-
x = 1 * 2.4 * 10^-4 /2
x = 1.2 * 10^-4 moles of Pb^2+
Concentration of Pb^2+ precipitated from 5ml of tap water = 1.2 * 10^-4 * 1000/5
Concentration = 2.4 * 10^-2 M
The amount of Pb^2+ found in the water is greater than the maximum allowable concentration of Pb2+ ions in water in a local community which is 1.51 x 10-8 M. Therefore, the water supply is not safe.
the moon changing positions causes all of the following except one of these. which is not caused by the moon changing positions?
A. Phases of the moon
B. Eclipse
C. Weather
D. Tides
Answer:
A.phase of moon
I hope it helps you
Plz help
A candle burning is an example of
A. an endothermic change
B. a physical change
C. energy being taken in
D. an exothermic change
Answer:
D
Explanation: An exothermic change is Because it has heat.
