Answer:
CaBr2 is a colorless solid and the charge on Calcium is +2
Explanation:
CaBr2 is a colorless solid at room temperature.
Other properties include -
a) It is a crystalline solid
b) Melting point of 765°C.
c) It is deliquescent
d) Soluble in water and absolute alcohol.
The charge of Br is -1. Here two atoms of Br attaches with one atom of calcium. Hence the charge of calcium is +2
How do ethnics affect scientific research ?
Answer:
A
Explanation:
scientists should not be allowed to conduct research that is harmful to others.
What is the molarity to the nearest hundredth of a solution made by dissolving 1.71 moles of NaOH in enough water to produce an 875 mL solution? (REMINDER THE VOLUME MUST BE IN L. 1000 ML = 1 L)
Answer:
Explanation:
50 is the volume
Answer: 1.95 mol/l
Explanation: molarity = concentration = amount of substance/volume.
Also v = n/V= 1.71 mol/ 0.875 litres= 1.9542857 mol/l
The
of a chemical reaction is the maximum amount of product that can be produced
Answer= Maximum amount of product that could be obtained under ideal conditions from a given amount of reactants.
Explanation:
The theoretical yields is the ideal maximum amount of a product that can be produced during a chemical reaction while the limiting reactant is the reactant that determines the maximum amount of product that can be formed. mitgliedd1 and 61 more users found this answer helpful.
Which of the following is a pure substance?
Chlorine B. salt solution C. bronze D. salad dressing
What is the boiling point of pure water?
About 1000 C B. exactly 1000 C C. it varies D. slightly above 1000 C
Which is an example of a chemical change?
Water evaporating B. butter melting C. match burning D. powder being made
Which of these indicate a chemical change?
Color change B. temperature change C. gas-forming D. all of the above
Which of these is an impure substance?
Tap water B. gold C. carbon dioxide D. boron
Answer:
1. B
2. 100 C
3. C
4. D
5. D
Explanation:
A change of state does not affect an object's what?
Answer:
mass.
Explanation:
Solve this puzzle
R+R
What is electrolysis
Answer:
Electrolysis is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them. Electricity is the flow of electrons or ions.
Explanation:
hope it helped:)))))
Please help fast. I will give brainliest!
Answer:
c=-1+x=varible+a=(5)^3
Explanation:
facts
12) Balance the following chemical equation:
Zn +
H3PO4
Zn3(PO4)2 +
H2
Answer:
Sorry I am not very good at chemistry.
Explanation:
50 points if its right In the Northern Hemisphere, choose ALL that apply
Question 2 options:
Summer solstice occurs when the Earth's North Pole is tilted toward the sun.
Fall and Spring Equinoxes occur when days and nights are equal in length.
The tilt and revolution of the Earth causes the seasons
Winter solstice occurs when the Earth's North Pole is tilted away from the sun.
Answer:
All are correct
Explanation:
I took the test
Answer: pick all
Explanation:
i got 100% on my qiuz
2. What is the pressure of a fixed volume of hydrogen gas at 30.0°C if it has a pressure of 1.11 atm at 15.0°C?
Answer:
1.17
Explanation:
1.17 hope this helps
The initial pressure of the fixed volume of the hydrogen gas as the pressure and temperature decreased is 1.17atm.
What is Gay-Lussac's law?Gay-Lussac's law states that the pressure exerted by a given quantity of gas varies directly with the absolute temperature of the gas.
It is expressed as;
P₁/T₁ = P₂/T₂
Given the data in the question;
Initial pressure P₁ = ? Initial temperature T₁ = 30.0°C = 303.15KFinal pressure P₂ = 1.11atmInitial temperature T₂ = 15.0°C = 288.15KWe substitute our values into the expression above.
P₁/T₁ = P₂/T₂
P₁T₂ = P₂T₁
P₁ = P₂T₁ / T₂
P₁ = ( 1.11atm × 303.15K ) / 288.15K
P₁ = 336.4965 / 288.15K
P₁ = 1.17atm
Therefore, the initial pressure of the fixed volume of the hydrogen gas as the pressure and temperature decreased is 1.17atm.
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This is produced by a cell that has been infected by a virus, to protect the other cells from becoming infected.
Answer:
interferons
Explanation:
Virally infected cells produce and release small proteins called interferons, which play a role in immune protection against viruses. Interferons prevent replication of viruses, by directly interfering with their ability to replicate within an infected cell.
A cough medicine contains 0.25% (w/v) dextromethorphan, a cough suppressant, and 1.1% (w/v) guaifenisin, an expectorant. How many milligrams of each drug would you obtain from 1.5 tsp of cough syrup? (1 tsp = 4.93 mL)
Answer:
See explanation
Explanation:
We know that we obtain the w/v % concentration as follows;
w/v (%) = [mass solute (g) ÷ volume solution (mL)] × 100
volume of solution = 4.93 mL
So,
For dextromethorphan
0.25 = mass/4.93 * 100
0.25 * 4.93 = 100 mass
mass = 0.25 * 4.93/100
mass = 0.0123 g
For guaifenisin,
1.1 = mass/4.93 * 100
1.1 * 4.93 = 100 mass
mass = 1.1 * 4.93/100
mass = 0.0542g
What is the answer:
C4H8+H2=
How many particles of CuCr2O7 are present in a 64.5 gram sample?
1.39 × 10²³ particles CuCr₂O₇
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 64.5 g CuCr₂O₇
[Solve] particles CuCr₂O₇
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of Cu - 63.55 g/mol
[PT] Molar Mass of Cr - 52.00 g/mol
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of CuCr₂O₇ - 63.55 + 2(52.00) + 7(16.00) = 279.55 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 64.5 \ g \ CuCr_2O_7(\frac{1 \ mol \ CuCr_2O_7}{279.55 \ g \ CuCr_2O_7})(\frac{6.022 \cdot 10^{23} \ particles \ CuCr_2O_7}{1 \ mol \ CuCr_2O_7})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 1.38944 \cdot 10^{23} \ particles \ CuCr_2O_7[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.38944 × 10²³ particles CuCr₂O₇ ≈ 1.39 × 10²³ particles CuCr₂O₇
Students are investigating the relationship between pressure and temperature in gases. They have blown up a balloon with carbon dioxide from an air tank and connected the balloon to a pressure gauge. The balloon is then submerged in ice or water baths at various temperatures in order to observe the pressure level after several minutes. What is the flaw in the student’s investigation, and how can the students improve their investigation to correctly determine the relationship?
A.
The volume and density of the air in the balloon can change, therefore they need to use several different balloons at different volumes to account for how density and volume affects pressure.
B.
The volume of the balloon can change, therefore they need to use several different balloons at different volumes to account for how volume affects pressure.
C.
The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.
D.
To keep the volume of the balloon from changing, so they can focus on temperature and pressure they need to use a container that does not expand like a balloon. A constainer made of plastic or metal to hold the air.
Answer:
The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.
Explanation:
According to Reference Table G, which of these substances is most soluble at 60°C?
1. NaCl
2. KCl
3. KClO3
4. NH4Cl
Answer: 4.NH4CI
Explanation:
According to Reference Table G, the substance which is most soluble at 60°C is:
NH4CIWhat is Solubility?This refers to the ability of a solution to be able to be dissolved in liquid which is usually done when temperature is increased.
With this in mind, we can see that from the complete question, we can see that there is the presence of different mixtures and when put at the specific temperature of 60°C, NH4CI was the most soluble.
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Reading and Discussing an Article about Making a Homemade Voltaic Cell
In the space provided, describe your sketch using terms you have learned in the lesson.
Answer: The following should be included in your description
• Zinc is the anode, and copper is the cathode
• The lemon flesh and juice provide the salt bridge and electrolyte solution
• Electrons flow from zinc to copper through the external wires
• Electrolytes flow in the lemon. Positive ions (cations) moved toward copper electrodes (cathodes), and negative ions (anions) move toward zinc electrodes (anodes). These balance the charges building up
• Two cells in series provide more energy output than one. The clock may need more energy than can be supplied by one cell
• Batteries do not need external source of reactants, whereas a fuel cell must be supplied with reactants
Explanation: Edg 2021
What is the electron configuration of the element in period 2 that has 6 valence electrons?
Answer:
The order of a element in period 2 that has 6 valence electrons is:
1s²2s²2p²
Explanation:
The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).
There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1. Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f. In the sub-level s there can only be a maximum of 2 electrons, in p there can be a maximum of 6 electrons, in the sub-level d 10 electrons and finally in the sub-level f there can be a maximum of 14 electrons.
In level 1 there is only one sub-level, which will be the s. In level 2 there are 2 sub-levels, the s and the p. At level 3 there are 3 sub-levels s, p and d. And at level 4 there are 4 sub-levels, the s, the p, the d and the f.
Aufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits around the nucleus of the atom. This principle states that the filling of these orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.
The simplest of the sub-levels is 1s. If you fill the 1s you can start filling the 2s. After the 2s sub-level is satisfied, the 2p can begin to fill and so on.
So, the order of a element in period 2 that has 6 valence electrons is:
1s²2s²2p²
what is the effect of light on valence electrons?
Answer:
When a small amount of external energy in the form of light is applied to the conductor, the valence electrons gain enough energy from the light to break the bonding with the atom and they jumps into the conduction band.
The effect of light on valence bis absent negative charges in the valence band, correspond to electrons elevated to the conduction band. When the semiconductor is lit, current flow is increased by both electrons and holes.
Why are valence electrons important?The outermost or valence shell electrons, known as valence electrons, are crucial because they shed light on an element's chemical characteristics and are the ones that are acquired, lost, or shared during a chemical reaction.
In general, when an atom's outermost electron shell is full, it is at its most stable and least reactive.
Thus, The valence electrons get enough energy from the light to break their link with the atom and move into the conduction band when a modest amount of external energy in the form of light is delivered to the conductor.
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which type of window is double glazed window
Answer:
Hope this helps and have a good day!
Explanation:
Double glazed is a fancy term for a window that has two panes of glass. There are also triple glazed windows (three panes). The multiple panes of glass in a single window frame helps with insulation.
How is stoichiometry used to calculate the amount of product produced?
A. Stoichiometry measures the amount of product obtained.
B. Stoichiometry determines the molar mass of the product.
C. Stoichiometry calculates the grams of the limiting reagent.
D. Stoichiometry relates moles of product.
Answer:
Stoichiometry relates moles of reactant to moles of product
Explanation:
Just took the quiz :)
Answer:
Stoichiometry relates moles of reactant to moles of product.
Explanation: :)
Based on the data what can be inferred about the biotic factors of this religion
Answer:
I would say the answer is D
Explanation:
This is hard, isn't it? please help me though. PLEASE
What is the correct IUPAC name for the acid: H2Lv
Can somebody help please
Answer:
98 moles of H₂O.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2HCl + CaCO₃ —> CaCl₂ + H₂O + CO₂
From the balanced equation above,
1 mole of CaCO₃ reacted to produce 1 mole of H₂O.
Finally, we shall determine the number of mole of H₂O produced by the reaction of 98 moles of CaCO₃. This can be obtained as follow:
From the balanced equation above,
1 mole of CaCO₃ reacted to produce 1 mole of H₂O.
Therefore, 98 moles of CaCO₃ will also react to produce 98 moles of H₂O.
Thus, 98 moles of H₂O were obtained from the reaction.
An organism from the past that is related to all the organisms in the group is called?
Answer:
phylogenic trees/phylogeny
Explanation:
the evolutionary history and relationship of an organism or group of organisms is called its phylogeny
If the initial rate of H2 to disappear is 2.0 moles per second, what is the rate of appearance of NH3 at the same time? N2(g) 3 H2(g) ⇌ 2 NH3(g)
Answer:
1.33 moles per second
Explanation:
From the balanced equation of reaction, 3 moles of H2(g) need to disappear/be consumed before 2 moles of NH3(g) can be formed/appear.
According to reaction law, the rate of disappearance of reactants is equal to the rate of appearance of products.
Now, only 2 moles per seconds of H2 has disappeared initially;
3 moles H2 is needed for 2 moles NH3
2 moles H2 will give; 2 x 2/3 = 4/3 or 1.33 moles
Hence, if the initial rate of disappearance of H2 is 2.0 moles per second, the initial rate of appearance of NH3 would be 1.33 moles per second.
A container is filled with 12.5 g of O, gas, what is this amount in liters?
What is one disadvantage of using nuclear fission to produce electricity?
Answer:
D
Explanation:
Answer is the last one.......
Nuclear reaction of which nuclear fission is a type has a disadvantage that it is difficult to store and dispose of radioactive wastes.
What are nuclear reactions?
There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
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