All categories

4 years ago

Match the vocabulary terms to their definitions.

Chemistry

2 answers:

vesna_86 [32]4 years ago

7 0

Answer:

1. The standard metric unit of length is a meter.

2. A proposed explanation for a scientific problem is a hypothesis.

3. The standard unit of volume is a liter.

4. The curved top surface of a liquid column is the meniscus.

5. A quantity in an experiment that remains unchanges or constant is a controlled variable (control)

6. The amount of matter in an object is mass.

Dennis_Churaev [7]4 years ago

6 0

Explanation:

1. Standard metric unit of length → meter

Unit is defined as the quantity that is used as a standard for measurement. Meter, Centimeters, hectometers are the units which is used to express length of a substance.

2. A proposed explanation for a scientific problem → hypothesis

Hypothesis is defined as explanation or supposition made on the basis of limited evidence for a specific process or phenomena.

3. Standard unit of volume → liter

Liter is the unit which is used to express volume occupied by the substance.

4. The curved top surface of a liquid column → meniscus

Liquids from two types of meniscus :

Concave shaped curve due to adhesive forces and is dominating inside the glass.

Convex shaped curve due to due to cohesive forces and is dominating on the top of glass.

5. A quantity in an experiment that remains unchanged or constant → control

Control variable is an experimental variable which is kept unchanged or remains constant through out the course of an experiment.

6. Amount of matter in an object → mass

Mass of the body is defined as quantity of present in a given object. It is a constant quantity.

You might be interested in

How many moles are in 325mL of 1.25M (NH4)2SO4

mote1985 [20]

Answer:

$n_{solute}=0.406mol(NH_4)_2SO_4$

Explanation:

Hello,

In this case, since the molarity is defined as the ratio of the moles of the solute to the volume of the solution in liters:

$M=\frac{n_{solute}}{V_{solution}}$

For the given volume and molarity, we solve for the moles of ammonium sulfate (solute) as shown below:

$n_{solute}=M*V_{solution}=1.25\frac{mol}{L}*325mL*\frac{1L}{1000mL} \\\\n_{solute}=0.406mol(NH_4)_2SO_4$

Best regards.

4 0

4 years ago

To what final concentration of NH3 must a solution be adjusted to just dissolve 0.060 mol of NiC2O4 (Ksp = 4×10−10) in 1.0 L of

ololo11 [35]

Given:
0.060 mol of NiC2O4
Ksp = 4 x 10⁻¹⁰
1.0 L of solution
Kf of Ni(NH3)6 2⁺ = 1.2 x 10⁹
<span>NiC2O4 + 6NH3 ⇋ Ni(NH3)6 2+ + 2O4 2- </span>
<span>NiC2O4 ⇋ Ni 2+ + C2O4 2- ...Ksp </span>
<span>Ni2+ + 6NH3 ⇋ Ni(NH3)6 2+...Kf </span>

Ksp * Kf = (4 x 10⁻¹⁰) * (1.2 x 10⁹) = 0.48

K = 0.48 = [Ni(NH3)6 2+][C2O4 2-] / [NH3]⁶<span>
</span>0.48 = (0.060)² / [NH3]⁶<span> ... (dissolved C2O4 2- = 0.060M)
</span><span>[NH3]</span>⁶<span> = (0.060)</span>²<span> / 0.48 = </span>0.0036 / 0.48 = 0.0075
NH3 = ⁶√0.0075

NH3 = 0.44 M

3 0

3 years ago

In the presence of CN-, Fe3 forms the complex ion Fe(CN)63-. The equilibrium concentrations of Fe3 and Fe(CN)63- are 8.5 x 10-40

aleksklad [387]

Answer:

Kf = 9.96x10⁴¹

Explanation:

When Fe³⁺ and CN⁻ are in water, complex Fe(CN)₆³⁻ is formed, thus:

Fe³⁺ + 6CN⁻ ⇄ Fe(CN)₆³⁻

Kf is defined as:

Kf = [Fe(CN)₆³⁻] / [Fe³⁺] [CN⁻]⁶

Equilibrium concentration of ions is:

[Fe(CN)₆³⁻] = 1.5x10⁻³M

[Fe³⁺] = 8.5x10⁻⁴⁰

[CN⁻] = [KCN] = 0.11M

Replacing in Kf expression:

Kf = [1.5x10⁻³M] / [8.5x10⁻⁴⁰] [ 0.11M]⁶

5 0

3 years ago

A 12 kg object experiences a net force of 120 N. What acceleration will this object experience?

Ivan

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

$a = \frac{f}{m} \\$

f is the force

m is the mass

From the question we have

$a = \frac{120}{12} \\$

We have the final answer as

Hope this helps you

3 0

3 years ago

A sample of Freon gas has a volume of 2.23 liters, a pressure of 4.85 kPa, and a temperature of -1.36°c. Calculate the volume at

Y_Kistochka [10]

Ummmmmmmmmmmmmmmm..........

3 0

3 years ago