How many grams of CaCl₂ should be dissolved in 500.0 mL of water to make a 0.20M solution of CaCl₂?

Answers

Answer 1

Answer: 0.2M means 0.2mol CaCl2/1L solution.

This question didn't give us a density of the solution so needs an assumption that the solution has equal volume to water.

xmol/0.5L=0.2M
x = 0.1

0.1mol of CaCl2 is needed. Ca=40g/mol, Cl=35.5g/mol.
CaCl2 0.1mol = (40+35.5*2)*0.1=11.1g

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In which type of chemical reaction do two or more reactants combine to form one product, only?a. synthesis
b. decomposition
c. single replacement
d. double replacement.

Answers

A chemical reaction is defined as the process in which two more reactants are converted to form one or more different product.

The chemical reaction in which two more reactants combine to form one product is a synthesis reaction.

Synthesis reactions are defined as the reaction in which two different atoms or molecules react to form a different compound. Synthesis reactions are exothermic reactions, such that the reactions release energy in the form of heat and light.

One of the most common examples of a synthesis reaction is the formation of sodium chloride. It can be expressed as:

Na (Sodium) + Cl (Chlorine) $\rightarrow$ NaCl (Sodium Chloride)

Thus, the synthesis reaction will result in one different compound or product.

The correct answer is Option A.

To know more about synthesis reaction, refer to the following link:

brainly.com/question/24936069

Synthesis is when multiple reactants come together to form one. Decomposition is when one reactant breaks down to form multiple products which are either elements or compounds. Single replacement is when there is an element and a compound and the element switch spots with the other element( metal switch with metal, nonmental with nonmetal, vice versa). The element has to be more reactive than the like element in the compound in order for it to be able to switch. Use the reactivity series to help you with this. Double Replacement is when you have two compounds and like elements switch places.

Only smart people are allowed to answer ONLY smart people............... If you can answer this correctly then maybe you are actually yourself!!!Fill in the blanks: ______ compounds break up into ______ and ______ in solution, which can move freely and carry an _______ current.

Answers

Answer:

Fill in the blanks: IONIC compounds break up into ANIONS and CATION in solution, which can move freely and carry an ELECTRICAL current.

Effects of warm tropical waters meeting with cool air.

Answers

The effect of warm tropical waters meeting with cool air is hurricane.

What is a hurricane?

A hurricane is formed when warm tropical water meet with air that is cool and humid. This creates a zone of pressure over the warm water causing the air to rotate.

Hence, the effect of warm tropical waters meeting with cool air is hurricane.

Learn more about hurricane:brainly.com/question/11891941

#SPJ2

A hurricane.. I believe

What mass of a 60.0-gram sample of N-16 will remain unchanged after 28.8 seconds?

Answers

The answer is 3.75 g.

Half-life is the time required for the amount of a sample to half its value.
To calculate the fraction of the sample remained unchanged, we will use the following formulas:
1. $(1/2)^(n) = x$ ,
where:
n - a number of half-lives
x - a remained fraction of a sample

2. $t_(1/2) = (t)/(n)$
where:
$t_(1/2)$ - half-life
t - total time elapsed
n - a number of half-lives

The half-life of N-16 is 7.13.
So, we know:
t = 28.8 s
$t_(1/2)$ = 7.13 s

We need:
n = ?
x = ?

We could first use the second equation, to calculate n:
If:
$t_(1/2) = (t)/(n)$ ,
Then:
$n = (t)/( t_(1/2) )$
⇒ $n = (28.8 s)/(7.13 s)$
⇒ $n=4.04$
⇒ n ≈ 4

Now we can use the first equation to calculate the remained amount of the sample.
$(1/2)^(n) = x$
⇒ $x=(1/2)^4$
⇒ $x= (1)/(16)$

If the fraction of the sample is 1/16 = 6.25%, then the mass of the sample could be calculated as:
x g : 6.25% = 60 g : 100%
x =

How many electrons does calcium lose when forming an ionic bond with another ion?a. 1
b. 2
c. 3
d. 4

Answers

The correct answer is answer choice B, 2. Calcium is in Column 2, meaning that it has 2 electrons in its outermost energy level. These two electrons must be lost for it to form an ionic bond with another element and become stable.

Questions like these can be easily answered if you have a periodic table on hand. Elements in Column 1 need to lose 1 electron to form ionic bonds, elements in Column 2 need to lose 2, and so on. Keep in mind, however, that elements in the center of the table are more likely to form metallic or covalent bonds, and elements in Columns 16 and 17 need to gain 2 and 1 electrons, respectively.

Sheela wants to make a computer model of a land ecosystem. Part of her model simulates the chemical processes of photosynthesis that involve the creation of sugars. Which of these chemical processes are these?A. the light-dependent reactions
B. the light-independent reactions
C. the dark reactions
D. the reactions in the mitochondria

Answers

The correct answer is A, the ligt-dependent reactions. These reactions are responsible for the production of glucose molecules, by the utilization of carbon dioxide, and water along with the sunlight. Glucose is then broken down during resiration process, for the production of ATP in mitochondria.

B. the light-independent reaction is the correct answer in Edgen

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