What is an atomic number
Answer:
the number of protons is called the atomic number
hope it helps you buddy
Answer: number of protons in an atom
Explanation:
Characteristics used to describe matter are called
O
A. physical properties.
O
B. chemical properties.
O
C. both A and B.
O
D. neither Anor B.
Answer:
A.physical properties
Aqueous aluminium bromide and solid zinc are formed by the reaction of solid aluminum and aqueous zinc bromide. Write a balanced chemical equation for this reaction.
Answer:
3 ZnBr2(aq) + 2Al (s) ====>2AlBr3 (aq) + 3 Zn(s),
Which of the following is a physical change?
A. Water reacting with potassium
B. Alcohol evaporating
C. Water splitting into hydrogen and oxygen
D. Alcohol burning
Explanation:
Alcohol burning
hope this helps you
HELP I WILL MARK YOU AS THE BRAINLIEST ANSWER
The atomic radii of elements on the periodic table generally _______ from left to right and _______ from top to bottom.
A.
increase; decrease
B.
decrease; increase
C.
stay the same; increase
D.
increase; increase
Hey there! Here is the answer:
B.) decrease; increase
Here's why:
As you move from left to right across a period on the periodic table the size of an atom will decrease. As you move from top to bottom down a group on the periodic table the size of an atom will increase.
I really hope this answer helps you out! :)
When you wash your hands or dishes, you probably don't use just water. In 5-7 sentences, explain what
you use to help you wash up, how it works, and why you think it works.
Hello! here is a paragraph you can use, that I type up to explain, make sure to not copy word for word of what I said. :)
What I use to wash up is soap. Soap has a certain ph level and includes acids and alkaline that enables water to mix and create soap foam to clean. Soap can come in many shapes and sizes, and can be either liquid, solid, or even foamy. I think soap works because when you use friction between your wet hands and the soap bar, you are rubbing the substances of the soap that clean your hands to clean your hands. I think the friction of the rubbing creates a layer of soap that can be used to clean, and when you increase friction the more change of the soap.
Have a great day,
I hope this helps!
Musical instruments like trumpets and trombones are made from an alloy called brass. Brass is composed of copper and zinc atoms and appears homogeneous under an optical microscope. The approximate composition of most brass objects is a 2:1 ratio of copper to zinc atoms, but the exact ratio varies somewhat from one piece of brass to another. (a) Would you classify brass as an element, a compound, a homogeneous mixture, or a heterogeneous mixture
Answer:
There are various substances found in nature, which are classified as an element, compound, and mixtures. Elements are pure substances, which are found in the simplest form, compounds are formed by the combining of two or more atoms of the same or different elements. Mixtures are categorized into homogenous and heterogenous, which are based on the composition of the mixture.
Explanation:
The homogenous mixtures are defined as the mixtures in which substances or components are evenly distributed and cannot be distinguished by each other. For example, detergent, air, and water. Alloys are also considered homogenous mixtures because the elements are mixed in some particular ratio. For instance, brass and steel are such types of homogenous alloys. In brass, the solid solution of copper and zinc are mixed in a specific ratio (2:1). However, the different instruments have different ratios of brass. The brass is classified as a homogenous mixture. In contrast, heterogeneous mixtures are those in which the composition of substances is not uniform. For example, oil and water.
Briefly identify a few characteristic points about the following bonds:
a. Ionic bonds
b. Covalent bonds
c. Hydrogen bonds.
Answer:
Chemical bonds hold molecules together and create temporary connections that are essential to life. Types of chemical bonds including covalent, ionic,
Explanation:
Ionic bond will form by transferring the electrons , covalent bond formed by sharing the electrons while hydrogen bond will be formed by bond between electronegative atom and hydrogen molecule.
What is ionic bond?
The chemical bond is formed when electrons are transferred from one atom to another. An ionic bond is the name for this type of relationship. Their melting and boiling points are quite high. Ionic chemicals, in other words, seem to be non-volatile.
What is covalent bond?When one non-metal reacts with just another non-metal, electrons are shared across their atoms, resulting in the development of a covalent bond. Among two or more atoms with same non-metal, a covalent connection can be established.
What is hydrogen bond?Hydrogen bonding is just a sort of dipole-dipole attraction that occurs between molecules rather than a covalently link with a hydrogen atom.
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Can someone do this for me!!????PLEASEEEE
Answer:
no that's worth points
Explanation:
life scientist study life and the many processes that occur in living things____-
Answer:
life scientist study life and the many processes that occur in living things__during experiments__-
please mark me brainliest pleaseWhat does the -40, -42, -43, -44, -46,-48 mean for each isotope of Calcium?
Atoms are mostly made up of the
between electrons and the nucleus.
Answer:
yes
Explanation:
What causes the pressure in a gas
Answer:
Gas pressure is caused when gas particles hit the walls of their container. The more often the particles hit the walls, and the faster they are moving when they do this, the higher the pressure. This is why the pressure in a tyre or balloon goes up when more air is pumped in.
Which one is the strongest acid?
•Formic acid
•oleic acid
•Malnoic acid
•None
Describe what must be happening to the particles above as the change is happening
Answer:
d
Explanation:
solids the modicual are tightly packed
liquid, more room to move around aka not so tightly packed
gas, can move where ever it wants aka not paked at all
Convert 5.15 meters to inches
Answer:
202.76 inches
Explanation:
1 meter = 39.37 inches
5.15 × 39.37 = 202.7559,when rounded it's 202.76
Please help me please find the answer
Please do this
Please do this
Plzz
Plzz
Total distance=60m+40m=100m
Total Time=6+4=10s
#a
[tex]\boxed{\sf Speed=\dfrac{Distance}{Time}}[/tex]
[tex]\\ \sf\longmapsto Speed=\dfrac{100}{10}[/tex]
[tex]\\ \sf\longmapsto 10m/s[/tex]
#b
Displacement=AC=60m
[tex]\\ \sf\longmapsto Velocity=\dfrac{Displacement}{Time}[/tex]
[tex]\\ \sf\longmapsto Velocity=\dfrac{60}{10}[/tex]
[tex]\\ \sf\longmapsto 6m/s[/tex]
#C
Distance=60m
time=5s
[tex]\\ \sf\longmapsto Velocity=\dfrac{60}{5}=12m/s[/tex]
#d
The velocity of A to C is greater than Velocity from C to A
imagine you find a bowl filled with clear liquid in your kitchen list three liquids it might be
Answer: Three liquids that could fill a bowl with clear liquid in your kitchen could be alcohol, dish soap, juice (without pectin or pulp), sports drinks, and water (carbonated, coconut, flavored, or plain).
Which of the following are considered elements:
Answer:
considered as element
Helium He
Calculate the force needed to accelerate a 300 kg mass at 5
mls acceleration.
Explanation:
Force=mass *acceleration
F=300*5
f
F=1500N
Each roman numeral represents a sample of a substance. Each circle represents an atom. Considering what qualifies as a pure substance, which image(s) would be considered pure substances?
III and V
V
II and IV
I and III
Answer:
III and V
Explanation:
Both of them are evenly spread homogenous mixtures.
The images that would be considered pure substances are III and V. Thus, the correct option for this question is A.
What is a Pure substance?A pure substance may be defined as a type of substance or matter that has a constant composition and properties that are constant throughout the sample.
It is scientifically found that a pure substance is typically made up of only one kind of particle and has a fixed or constant structure. According to the given diagram, images III and V signify the even distribution of the same type of atoms of molecules within the substances.
Apart from physical properties, pure substances also shares identical chemical properties as well.
Therefore, the images that would be considered pure substances are III and V. Thus, the correct option for this question is A.
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Arrange the following aqueous solutions in order of increasing boiling points.
0.050 m Mg(NO 3) 2; 0.100 m ethanol; 0.090 m NaCl
a. Mg(NO3) < NaCl < ethanol
b. ethanol < Mg(NO3)2 < NaCl
c. ethanol < NaCl < Mg(NO3)2
d. NaCl < ethanol < Mg(NO3)2
e. Mg(NO3)2 < ethanol < NaCl
Answer:
The correct choice is option b. ethanol < Mg(NO3)2 < NaCl
Explanation:
Ethanol = 0.100 m
Mg(NO3)2 = 0.15 m
NaCl = 0.18 m
The molar concentration of NaCl is the highest, which is why its boiling point will be the highest, too.
How does increasing the temperature of a liquid below the boiling point affect
the motion of the particles in the liquid?
A 0.450 M solution of HCl is prepared by adding some 1.50 M HCl to a 500 mL volumetric flask and diluting to the mark with deionized water. What volume of 1.50 M HCl must be added
Answer:
150 mL of 1.50 M HCL
Explanation:
So the equation you need to solve this equation is:
M1*V1=M2*V2 --> M1= Molarity of the acid you are diluting V1= Volume of the solution you need to dilute. M2=The molarity of thee solution you have made. V2=Volume of the solution you have made
M1= 1.50 M HCL
V1= Unknown
M2=0.450 M HCL
V2= 500 mL
Simple algebra says that V1= (1.5*500)/.450 = 150 mL of 1.50 M HCL
To scientific notation 5.029m
Answer:
5.029 × 100
Explanation:
What is the reason for the emission of light after the gas in a discharge tube is excited?
A)
photo-electric emission
Eliminate
B)
spontaneous radioactive reaction
C)
energy jumps by electrons due to excitation
D)
high energy reaction of the gas inside the tube
Answer:
c
Explanation:
took test on usa testprep
When gas in a discharge tube is excited to higher energy level after some seconds they return to the ground level by releasing energy in the form of light. Thus energy jumps by electron due to excitation is correct option.
What is gas discharge tube?A gas discharge tube is an electronic devise containing inert gases that ionizes and conducts results in emission of light.
When a potential is applied between the electrodes in a gas discharge tube, and the pressure is reduced, the gas particles inside forms a plasma of ions.
The electrons released when excited to higher energy level by absorbing energy and returns to the initial state by emitting energy in the form of light, the discharge tube glows.
The color emitted by the discharge tube vary based on the gas in the tube. Each type of gaseous ions emit different colors.
Therefore, the light emission in gas discharge tube is due to energy hike during electron excitation and then relaxing by emitting the light energy. Thus, option c is correct.
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Calculate the number of kilograms of sodium fluoride needed per year for a city of 100,000 people if the daily consumption of water per person is 150.0 gallons.
Fluoridation is the process of adding fluorine to drinking water to avoid tooth decay.
The question is incomplete; the complete question is;
Fluoridation is the process of adding fluorine compounds to drinking water to help fight tooth decay. A concentration of 1 ppm of fluorine is sufficient for the purpose. (1 ppm means one part per million, or 1 g of fluorine per 1 million g of water.) The compound normally chosen for fluoridation is sodium fluoride, which is also added to some toothpastes. Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons.
(Sodium fluoride is 45.0 percent fluorine by mass. 1 gallon = 3.79 L; 1 year = 365 days; 1 ton = 2000 lb; I lb = 453.6 g; density of water = 1.0 g/mL.)
The quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons is [tex]9.32 * 10^9 Kg[/tex].
From the question, we know that;
Daily consumption of water per person = 150 gallons.
Population of the city = 100,000 people
Total daily city consumption =[tex]100,000 * 150 gallons = 15 * 10^6 gallons[/tex]
Annual water consumption = [tex]15 * 10^6 gallons * 365 = 5.475 * 10^9 gallons[/tex]
1 gallon = 3.785 L = 3.785 kg
[tex]5.475 * 10^9 gallons = 5.475 * 10^9 gallons * 3.785 kg/ 1 gallon = 2.1 * 10^10 Kg[/tex]
Since sodium fluoride accounts for 45% by mass of water
Mass of sodium fluoride= [tex]0.45 * 2.1 * 10^10 Kg= 9.32 * 10^9 Kg[/tex]
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the ion Te2- has how many protons
Answer
Choice A
Answer
Choice B
Answer
Choice C
Question
A scientist hypothesizes that a new medication can reduce
the chances of catching a cold Which of these would most
likely be the dependent variable in a study involving this
medication?
//
The participants
who do not receive
the medication
Color PURPLE
The number of
participants who
catch a cold
Color YELLOW
The age of the
participants
Color GRAY
Tt remains the
T+ is purposely
It is used for
Answer:
what is the question????
Ammonium carbonate solution is added to dilute nitric acid. What is the balanced chemical equation?
