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3 years ago

PLEASE ANSWER

Chemistry

1 answer:

Aleks [24]3 years ago

6 0

Answer:

The answer is B. Jeff pushes on his box with twice the amount of force since his box has 1/2 the mass of Jim's box.

hope it helps!

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What is one property for each of the chemical substances listed above?

Vilka [71]

1. Acetic acid (Ethanoic acid) is a colorless liquid.

2. Sodium Bicarbonate is an odorless, crystalline powder.

3. Carbon dioxide is a colorless gas.

4. Dihydrogen monoxide is colorless and odorless gas.

5. Sodium acetate is very soluble in water.

6. Calcium chloride has an exothermic reaction when dissolved in water.

7. Calcium carbonate is also an odorless powder.

8. Sodium chloride is soluble in water, and partially soluble (or insoluble) in other liquids.

Hope this helps! (:

8 0

3 years ago

An igneous rock originally has 3 grams of uranium 238 in it. When dated the rock only contains 1.8 grams. What are the parent an

castortr0y [4]

Answer :

The parent and daughter concentrations (in percentages) is, 60 % and 40 % respectively.

The age of rock is $3.32\times 10^9\text{ years}$

Explanation :

First we have to calculate the parent and daughter concentrations (in percentages).

$\text{Parent concentrations}=\frac{1.8g}{3g}\times 100=60\%$

and,

$\text{Daughter concentrations}=\frac{(3-1.8)g}{3g}\times 100=40\%$

As we know that, the half-life of uranium-238 = $4.5\times 10^9$ years

Now we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{t_{1/2}}$

$k=\frac{0.693}{4.5\times 10^9\text{ years}}$

$k=1.54\times 10^{-10}\text{ years}^{-1}$

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $1.54\times 10^{-10}\text{ years}^{-1}$

t = time passed by the sample = ?

a = initial amount of the reactant = 3 g

a - x = amount left after decay process = 1.8 g

Now put all the given values in above equation, we get

$t=\frac{2.303}{1.54\times 10^{-10}}\log\frac{3}{1.8}$

$t=3.32\times 10^9\text{ years}$

Therefore, the age of rock is $3.32\times 10^9\text{ years}$

5 0

3 years ago

What volume of a 1.0 M HCl is required to completely neutralize 25.0 ml of a 1.0 M KOH?

Karo-lina-s [1.5K]

x 0,025
HCl+KOH--> KCl + H2O
1 1

c=1M
V=25ml=0,025l ( you need the volume to be in l)
c = n/V
n=c*V
n=1*0,025=0,025 m KOH

x=0,025m
c=1 M
V=n/c
V=0,025/1=0,025l=25ml HCl

3 0

3 years ago

A gas occupies a volume of 0.2l at 25 kpa. What volume will the gas occupy at 2.5kpa

EleoNora [17]

Boyle's Law: P₁V₁ = P₂V₂

So (25 kpa)(0.21) = (2.5 kpa) V₂

(25 kpa × 0.21)/ 2.5 kpa = 2.1

2.1 = V₂

8 0

3 years ago

Which of the following statements correctly describes the make-up and function of genes?

zloy xaker [14]

Genes are made of DNA and are carried on chromosomes.

3 0

4 years ago