Answer:
True.
Explanation:
What is the mass number of 199F?
Answer:
fluorine
Explanation:
hope it helps
when a car goes around a curve at a constant speed, in which direction is it accelerating
A. In the direction of the velocity
B. In the opposite direction of the velocity
C. Outside the curve
D. Inside the curve
A chemist is identifying the elements present in a sample of a sea water. What characteristics of an element's
atoms always determines the element's identity?
A.
B
C.
D
The number of protons
The number of neutrons
The location of valence electrons
The number of valence electrons
Answer:
The number of valence electrons
what is the correct answer ??
Answer:
Quantum mechanical which is described by the Greek letter phi that describes how energy is transmitted as electrons change or jump from one shell to the nextYou are given 100 g of a compound. The compound is composed of 37% hydrogen and 63% oxygen. How many grams of hydrogen are present in the 100 g sample?
Select one:
a. 37 g
b. 27 g
c. 100 g
d. 63 g
There are 37 grams of hydrogen present in the 100 g sample given that compound is composed of 37% hydrogen and 63% oxygen.
MASS OF AN ELEMENT:
According to this question, a compound is said to be composed of 37% hydrogen and 63% oxygen.
This means that in 100g of the compound, its elemental constituents are as follows:
H = 37/100 × 100O = 63/100 × 100This means that hydrogen will contain 37g in 100g of the given compound.
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CaCO3(s)+2H*(aq) →Ca2+ (aq)+H2001+CO262)
Initial
Initial Concentration
Experiment
Massof CaCO3(s) (grams) of Haq) (M)
1
5.00
1.0
2
5.00
2.0
Initial Temperatureof
Reactants (°C)
25.0
25.0
The initial rate of formation of CO2(e) from the chemical reaction represented by the
equation above was studied in two separate experiments. The table above provides the
experimental conditions used. If both experiments are carried out with finely powdered
samples of the solid and 50.0mL of HCl(aq), which experiment, if any, will have the faster
initial rate of formation of CO2(g) and why?
The rate of formation of CO2(g) will be the same because the mass of CaCO3(s) and the volume of
HCl(aq) used will be the same in both experiments.
CO2(g) will be formed at a faster rate in experiment 2 because more H* particles can react per
unit time.
O CO26) will be formed at a faster rate in experiment 1 because the proportion of CaCO3(s)
particles to H* particles will be greater.
The rate of formation of CO2(e) will be the same because the surface area of the solid and the
average kinetic energy of the particles will be the same in both experiments.
Answer:CO2(g) will be formed at a faster rate in experiment 2 because more H+ particles can react per unit time
Explanation:
[tex]CO_2_{(g)}[/tex] will be formed at a faster rate in experiment 2 because more H+ particles can react per unit time. The correct option is C.
What is a chemical reaction?A chemical reaction is a process that transforms one or more substances, known as reactants, to one or more different substances, known as products. Chemical elements or compounds are examples of substances.
Combination, decomposition, single-replacement, double-replacement, and combustion are the five basic types of chemical reactions.
Analyzing the reactants and products of a specific reaction will allow you to categorize it. Some reactions will fall into multiple categories.
If both experimental studies are carried out with finely powdered samples of the solid and 50.0mL of HCl (aq), then [tex]CO{_2_{(g)}[/tex] will be formed at a faster rate in experiment 2 because more H+ particles can react per unit time.
Thus, the correct option is C.
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Saturated hydrocarbons are major components of
○ vegetable oil.
○ alcohol
○ gasoline
○salt crystals
Saturated hydrocarbons are major components of gasoline. The correct option is C.
What are saturated hydrocarbons?Saturated hydrocarbons are those hydrocarbons in which the carbon atoms is attached with hydrogen atom with only single bond. They are the simplest form of hydrocarbons. Much hydrogen is attached to one carbon.
Thus, the correct option is C, gasoline.
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Saturated hydrocarbons are major components of gasoline.
What are saturated hydrocarbons?Alkanes are saturated hydrocarbons, chemical molecules with solitary carbon-atom bonds. Petroleum, natural gas, and coal contain them, as do many industrial and home items. Heating, cooking, and transportation employ saturated hydrocarbons, which burn easily. They are less reactive than unsaturated hydrocarbons because they lack double or triple bonds.
Saturated hydrocarbons are CnH2n+2, where n is the number of carbon atoms. Methane (CH4), a colourless, odourless gas, is the simplest alkane. Tetracontane (C40H82), a solid at ambient temperature, is the biggest. The structure and amount of carbon atoms of saturated hydrocarbons determine their physical and chemical characteristics.
Saturated hydrocarbons make polymers, rubber, and solvents. Lubricants, cosmetics, and pharmaceuticals utilise them. Saturated hydrocarbons emit greenhouse gases when burned, leading to global warming and climate change.
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2. When an atom loses an electron, it becomes a
_a._positive ion.
c. neutral ion.
b. negative ion.
d. neutral atom.
Answer:
A
Explanation:
Atoms of elements can lose or gain electrons making them no longer neutral, they become charged. A charged atom is called an ion. When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons.
If the size of an object decreases, volume does what?
Answer:
I'm pretty sure the volume decreases because the volume is like how much space it takes up. Sorry if im wrong.
Most of the energy that drives the water cycles comes from which of the following?
O The sun
O Earth's core
O Earth's oceans
O The equator
Triassic, Jurassic, and Cretaceous: these are also divisions of the Mesozoic Era
Answer:
correct
Explanation:
thanks for being a smarty pants
explain how the removal of thermal energy (heat) from matter affects its particles
Answer:
You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster
Explanation:
List 3 countries known to have poor water quality.
Answer
Ethiopia, Niger, Chad
Exlination-
Which of these are matter?
atoms
molecules
energy
The atoms and molecules are matter. Therefore, option A and B are correct.
What is matter ?Matter is defined as anything that occupies space and has mass—in other words, the "stuff" of the universe. All matter is composed of substances known as elements, which have distinct chemical and physical properties and cannot be broken down into other substances via ordinary chemical reactions.
Matter is defined as anything that occupies space and has mass. Water and air are examples of matter, whereas feelings and sound are not.
Physical and chemical properties can be used to classify matter. Matter is defined as something that occupies space and has mass. Solid, liquid, and gaseous are the three states of matter. The conversion of a material from one state of matter to another without changing its chemical composition is referred to as a physical transition.
Thus, option A and B are correct.
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student plans to isolate chlorophyll, mix it in a solution of carbon dioxide and water, and then shine light on the mixture. Do you predict glucose will be produced inside the mixture
Answer:
No
Explanation:
In order for glucose to be produced inside the mixture, photosynthesis has to take place. The photosynthetic process requires a series of steps within an organelle called the chloroplast. The chloroplast contains the chlorophyll and other enzymes that are necessary for photosynthesis.
Once the chlorophyll is isolated, it becomes separated from the enzymes necessary for the completion of photosynthesis, and the process is truncated. When light is shined on the mixture, the majority would instead be lost as heat while some cause the chlorophyll molecules to glow.
12. What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?
Answer:
9
Explanation:
mass number = protons + neutrons
= 4 + 5 = 9
If 250J of energy from the Sun hits the
atmosphere at a certain place, but only 128J
makes it to the surface of the Earth, how much
energy is reflected by the atmosphere?
What is the molarity of a solution in which 0.321 g of calcium chloride is dissolved in 1.45 L water?
Answer:
Molarity = 0.002 M
Explanation:
Given data:
Mass of calcium chloride = 0.321 g
Volume of water = 1.45 L
Molarity of solution = ?
Solution:
Molarity = number of moles / volume in litter.
We will calculate the number of moles of calcium chloride first.
Number of moles = mass/molar mass
Number of moles = 0.321 g/ 110.98 g/mol
Number of moles = 0.003 mol
Molarity:
Molarity = 0.003 mol / 1.45 L
Molarity = 0.002 M
Is corona increasing or decreasing the albedo effect? Explain.
Answer:
corona is increasing
.......
Explanation:
.....
Identify the type of the following chemical reaction.
Answer:
Hydrolysis reaction
Explanation:
For the equation BaCl2 + Na2SO4 → BaSO4 + 2NaCl, how many chlorine atoms are on the reactants side and on the products side?
reactants: 1; products: 1
reactants: 1; products: 2
reactants: 2; products: 1
reactants: 2; products: 2
Answer:
The balanced chemical reaction is written as follows:
bacl2 + na2so4 → baso4 + 2nacl
Therefore, the number of chlorine atoms in the reactants side and the products side would be 2 atoms in both sides which should be the case because the number of atoms in each side should have the same number.
Explanation:
Internet
Find the mass of 5.82 mol of MgCl2. Round to the nearest tenth.
Answer:
554.13 grams
Explanation:
The mass of 5.82 mol of MgCl2 is 552.9g. Details about how to calculate mass can be found below.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.
According to this question, there are 5.82 moles of MgCl2. The mass is calculated thus:
molar mass of MgCl2 = 24 + 35.5(2) = 95g/mol
mass of MgCl2 = 95g/mol × 5.82 moles
mass of MgCl2 = 552.9g
Therefore, the mass of 5.82 mol of MgCl2 is 552.9g.
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What is the potential energy of a bird sitting in a tree if the bird has a mass of 2Kg and it is 10 meters above the ground?
The potential energy of a bird : 196 J
Further explanationGiven
mass of bird = m = 2 kg
height = h = 10 m
Required
The potential energy
Solution
Potential energy is the energy that objects have because of their position. Usually related to the earth's gravitational force
Can be formulated
PE = m g h
g = acceleration due to gravity ⇒ 9.8 m/s²
Input the value :
PE = 2 kg x 9.8 m/s² x 10 m
PE = 196 J
10. (a) Describe how the structure of an alloy is different to a pure metal
You can type directly into this text box below: (2)
10. (b) Suggest why coins are not made of pure copper. Do not give cost as a reason.
You can type directly into this text box below: (1)
Grade 5+ 15 marks
Total 27 marks
Um, yea, please help lol
How many moles are equal to 89.23g of aluminum chloride, AlCl3?
Answer:
[tex]\boxed {\boxed {\sf 0.6692 \ mol \ AlCl_3}}[/tex]
Explanation:
To convert from grams to moles, we must use the molar mass. This can be calculated using the Periodic Table.
1. Molar Mass
First, identify the elements in the compound AlCl₃. They are aluminum and chlorine. Now find the masses:
Al: 26.981538 g/mol Cl: 35.45 g/molTake a look at the compound. There is a subscript of 3 after chlorine, so we must multiply its molar mass by 3 then add aluminum's.
AlCl₃= 3(35.34 g/mol) + 26.981538 g/mol = 133.331538 g/mol2. Convert Grams to Moles
We can use the molar mass as a ratio.
[tex]\frac{133.331538 \ g \ AlCl_3}{1 \ mol \ AlCl_3}[/tex]
Multiply by the given number of grams: 89.23
[tex]89.23 \ g \ AlCl_3 * \frac{133.331538 \ g \ AlCl_3}{1 \ mol \ AlCl_3}[/tex]
Flip the fraction so the grams of aluminum chloride cancel out.
[tex]89.23 \ g \ AlCl_3 * \frac{1 \ mol \ AlCl_3}{133.331538 \ g \ AlCl_3} = 89.23 \ * \frac{1 \ mol \ AlCl_3}{133.331538}[/tex]
[tex]\frac{89.23 \ mol \ AlCl_3}{133.331538}[/tex]
[tex]0.6692340112 \ mol \ AlCl_3[/tex]
3. Round
The original measurement of grams has 4 significant figures. We must round to 4 sig figs.
For the number we calculated, that is the ten thousandth place.
The 3 in the hundred thousandth place tells us to leave the 2.
[tex]0.6692 \ mol \ AlCl_3[/tex]
There are about 0.6692 moles of aluminum chloride in 89.23 grams.
How are the atoms of group 16 elements become
stable?
A- By losing two electrons
9725e74
729 41982
B - By gaining two electrons
C - By losing six electrons
D - By gaining six electrons
Answer:
B - by gaining 2 electrons
Explanation:
Answer:
The atoms of group 16 elements become
stable by gaining two electrons.
The student carried out three titrations. The results are shown below (pic)
Use the student's concordant results (those within 0.10 cm of each other)
to work out the mean volume of sulfuric acid added.
Answer:
yes
Explanation:
A cart with the weight was already moving lefgt with a constant speed when the two forces shown were applied to the car. How do the two forces affect the motion of the cart?
Explanation:
the cart will be slowed down because the weight was added to the right the cart won't stop for about 10 seconds. there will be a lot of pull and friction therefore the cart slows down drastically
What is the Molar Mass of BaCl2?
A student in your class has decided to dissolve Epsom salts in water and observe the crystals that are left behind after the water evaporates. Is this an example of a chemical change? Use evidence and scientific reasoning to support your claim.
Answer:
Physical change
Explanation:
Dissolution of salt in water is a typical example of physical change and not a chemical change.
In a chemical change new products are formed which are different from the reactants.
In a physical change, the state of matter changes from one form to another.
Since this is a change in state, a physical change has occurred. Also, the reaction is easily reversible simply by evaporation. Most chemical changes are not easily reversible.Dissolving epsom salts in water and observing the crystals that are left behind after the water evaporates is not a chemical change.
CHEMICAL CHANGE:
Changes that occur in nature can either be physical or chemical. Physical change are those changes that does not involve the chemical property of substances involved. Chemical change, on the other hand, alters the chemical composition of the substances involved. Examples are rusting. Chemical change forms a new product and are usually irreversible. According to this question, dissolving epsom salts in water is not an example of chemical change because it does not involve the formation of new substances.Learn more at: https://brainly.com/question/23693316?referrer=searchResults